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cairo-surface.c

/* -*- Mode: c; tab-width: 8; c-basic-offset: 4; indent-tabs-mode: t; -*- */
/* cairo - a vector graphics library with display and print output
 *
 * Copyright © 2002 University of Southern California
 * Copyright © 2005 Red Hat, Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it either under the terms of the GNU Lesser General Public
 * License version 2.1 as published by the Free Software Foundation
 * (the "LGPL") or, at your option, under the terms of the Mozilla
 * Public License Version 1.1 (the "MPL"). If you do not alter this
 * notice, a recipient may use your version of this file under either
 * the MPL or the LGPL.
 *
 * You should have received a copy of the LGPL along with this library
 * in the file COPYING-LGPL-2.1; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
 * You should have received a copy of the MPL along with this library
 * in the file COPYING-MPL-1.1
 *
 * The contents of this file are subject to the Mozilla Public License
 * Version 1.1 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
 * OF ANY KIND, either express or implied. See the LGPL or the MPL for
 * the specific language governing rights and limitations.
 *
 * The Original Code is the cairo graphics library.
 *
 * The Initial Developer of the Original Code is University of Southern
 * California.
 *
 * Contributor(s):
 *    Carl D. Worth <cworth@cworth.org>
 */

#include "cairoint.h"

#include "cairo-surface-fallback-private.h"
#include "cairo-clip-private.h"
#include "cairo-device-private.h"
#include "cairo-error-private.h"
#include "cairo-recording-surface-private.h"
#include "cairo-region-private.h"
#include "cairo-tee-surface-private.h"

/**
 * SECTION:cairo-surface
 * @Title: cairo_surface_t
 * @Short_Description: Base class for surfaces
 * @See_Also: #cairo_t, #cairo_pattern_t
 *
 * #cairo_surface_t is the abstract type representing all different drawing
 * targets that cairo can render to.  The actual drawings are
 * performed using a cairo <firstterm>context</firstterm>.
 *
 * A cairo surface is created by using <firstterm>backend</firstterm>-specific
 * constructors, typically of the form
 * cairo_<emphasis>backend</emphasis>_surface_create().
 *
 * Most surface types allow accessing the surface without using Cairo
 * functions. If you do this, keep in mind that it is mandatory that you call
 * cairo_surface_flush() before reading from or writing to the surface and that
 * you must use cairo_surface_mark_dirty() after modifying it.
 * <example>
 * <title>Directly modifying an image surface</title>
 * <programlisting>
 * void
 * modify_image_surface (cairo_surface_t *surface)
 * {
 *   unsigned char *data;
 *   int width, height, stride;
 *
 *   // flush to ensure all writing to the image was done
 *   cairo_surface_flush (surface);
 *
 *   // modify the image
 *   data = cairo_image_surface_get_data (surface);
 *   width = cairo_image_surface_get_width (surface);
 *   height = cairo_image_surface_get_height (surface);
 *   stride = cairo_image_surface_get_stride (surface);
 *   modify_image_data (data, width, height, stride);
 *
 *   // mark the image dirty so Cairo clears its caches.
 *   cairo_surface_mark_dirty (surface);
 * }
 * </programlisting>
 * </example>
 * Note that for other surface types it might be necessary to acquire the
 * surface's device first. See cairo_device_acquire() for a discussion of
 * devices.
 */

#define DEFINE_NIL_SURFACE(status, name)              \
const cairo_surface_t name = {                              \
    NULL,                     /* backend */           \
    NULL,                     /* device */            \
    CAIRO_SURFACE_TYPE_IMAGE,       /* type */        \
    CAIRO_CONTENT_COLOR,            /* content */           \
    CAIRO_REFERENCE_COUNT_INVALID,  /* ref_count */         \
    status,                   /* status */            \
    0,                              /* unique id */         \
    FALSE,                    /* finished */          \
    TRUE,                     /* is_clear */          \
    FALSE,                    /* has_font_options */  \
    FALSE,                    /* owns_device */ \
    { 0, 0, 0, NULL, },             /* user_data */         \
    { 0, 0, 0, NULL, },             /* mime_data */         \
    { 1.0, 0.0, 0.0, 1.0, 0.0, 0.0 },   /* device_transform */    \
    { 1.0, 0.0,   0.0, 1.0, 0.0, 0.0 },   /* device_transform_inverse */      \
    { NULL, NULL },                 /* device_transform_observers */ \
    0.0,                      /* x_resolution */      \
    0.0,                      /* y_resolution */      \
    0.0,                      /* x_fallback_resolution */   \
    0.0,                      /* y_fallback_resolution */   \
    NULL,                     /* snapshot_of */ \
    NULL,                     /* snapshot_detach */   \
    { NULL, NULL },                 /* snapshots */         \
    { NULL, NULL },                 /* snapshot */          \
    { CAIRO_ANTIALIAS_DEFAULT,            /* antialias */         \
      CAIRO_SUBPIXEL_ORDER_DEFAULT, /* subpixel_order */    \
      CAIRO_LCD_FILTER_DEFAULT,           /* lcd_filter */  \
      CAIRO_HINT_STYLE_DEFAULT,           /* hint_style */  \
      CAIRO_HINT_METRICS_DEFAULT    /* hint_metrics */      \
    }                         /* font_options */      \
}

/* XXX error object! */

static DEFINE_NIL_SURFACE(CAIRO_STATUS_NO_MEMORY, _cairo_surface_nil);
static DEFINE_NIL_SURFACE(CAIRO_STATUS_SURFACE_TYPE_MISMATCH, _cairo_surface_nil_surface_type_mismatch);
static DEFINE_NIL_SURFACE(CAIRO_STATUS_INVALID_STATUS, _cairo_surface_nil_invalid_status);
static DEFINE_NIL_SURFACE(CAIRO_STATUS_INVALID_CONTENT, _cairo_surface_nil_invalid_content);
static DEFINE_NIL_SURFACE(CAIRO_STATUS_INVALID_FORMAT, _cairo_surface_nil_invalid_format);
static DEFINE_NIL_SURFACE(CAIRO_STATUS_INVALID_VISUAL, _cairo_surface_nil_invalid_visual);
static DEFINE_NIL_SURFACE(CAIRO_STATUS_FILE_NOT_FOUND, _cairo_surface_nil_file_not_found);
static DEFINE_NIL_SURFACE(CAIRO_STATUS_TEMP_FILE_ERROR, _cairo_surface_nil_temp_file_error);
static DEFINE_NIL_SURFACE(CAIRO_STATUS_READ_ERROR, _cairo_surface_nil_read_error);
static DEFINE_NIL_SURFACE(CAIRO_STATUS_WRITE_ERROR, _cairo_surface_nil_write_error);
static DEFINE_NIL_SURFACE(CAIRO_STATUS_INVALID_STRIDE, _cairo_surface_nil_invalid_stride);
static DEFINE_NIL_SURFACE(CAIRO_STATUS_INVALID_SIZE, _cairo_surface_nil_invalid_size);
static DEFINE_NIL_SURFACE(CAIRO_STATUS_DEVICE_TYPE_MISMATCH, _cairo_surface_nil_device_type_mismatch);
static DEFINE_NIL_SURFACE(CAIRO_STATUS_DEVICE_ERROR, _cairo_surface_nil_device_error);

/**
 * _cairo_surface_set_error:
 * @surface: a surface
 * @status: a status value indicating an error
 *
 * Atomically sets surface->status to @status and calls _cairo_error;
 * Does nothing if status is %CAIRO_STATUS_SUCCESS or any of the internal
 * status values.
 *
 * All assignments of an error status to surface->status should happen
 * through _cairo_surface_set_error(). Note that due to the nature of
 * the atomic operation, it is not safe to call this function on the
 * nil objects.
 *
 * The purpose of this function is to allow the user to set a
 * breakpoint in _cairo_error() to generate a stack trace for when the
 * user causes cairo to detect an error.
 *
 * Return value: the error status.
 **/
cairo_status_t
_cairo_surface_set_error (cairo_surface_t *surface,
                    cairo_status_t status)
{
    if (status == CAIRO_INT_STATUS_NOTHING_TO_DO)
      status = CAIRO_STATUS_SUCCESS;

    if (status == CAIRO_STATUS_SUCCESS || status >= CAIRO_INT_STATUS_UNSUPPORTED)
      return status;

    /* Don't overwrite an existing error. This preserves the first
     * error, which is the most significant. */
    _cairo_status_set_error (&surface->status, status);

    return _cairo_error (status);
}

/**
 * cairo_surface_get_type:
 * @surface: a #cairo_surface_t
 *
 * This function returns the type of the backend used to create
 * a surface. See #cairo_surface_type_t for available types.
 *
 * Return value: The type of @surface.
 *
 * Since: 1.2
 **/
cairo_surface_type_t
cairo_surface_get_type (cairo_surface_t *surface)
{
    /* We don't use surface->backend->type here so that some of the
     * special "wrapper" surfaces such as cairo_paginated_surface_t
     * can override surface->type with the type of the "child"
     * surface. */
    return surface->type;
}
slim_hidden_def (cairo_surface_get_type);

/**
 * cairo_surface_get_content:
 * @surface: a #cairo_surface_t
 *
 * This function returns the content type of @surface which indicates
 * whether the surface contains color and/or alpha information. See
 * #cairo_content_t.
 *
 * Return value: The content type of @surface.
 *
 * Since: 1.2
 **/
cairo_content_t
cairo_surface_get_content (cairo_surface_t *surface)
{
    return surface->content;
}
slim_hidden_def(cairo_surface_get_content);

/**
 * cairo_surface_status:
 * @surface: a #cairo_surface_t
 *
 * Checks whether an error has previously occurred for this
 * surface.
 *
 * Return value: %CAIRO_STATUS_SUCCESS, %CAIRO_STATUS_NULL_POINTER,
 * %CAIRO_STATUS_NO_MEMORY, %CAIRO_STATUS_READ_ERROR,
 * %CAIRO_STATUS_INVALID_CONTENT, %CAIRO_STATUS_INVALID_FORMAT, or
 * %CAIRO_STATUS_INVALID_VISUAL.
 **/
cairo_status_t
cairo_surface_status (cairo_surface_t *surface)
{
    return surface->status;
}
slim_hidden_def (cairo_surface_status);

static unsigned int
_cairo_surface_allocate_unique_id (void)
{
    static cairo_atomic_int_t unique_id;

#if CAIRO_NO_MUTEX
    if (++unique_id == 0)
      unique_id = 1;
    return unique_id;
#else
    cairo_atomic_int_t old, id;

    do {
      old = _cairo_atomic_uint_get (&unique_id);
      id = old + 1;
      if (id == 0)
          id = 1;
    } while (! _cairo_atomic_uint_cmpxchg (&unique_id, old, id));

    return id;
#endif
}

/**
 * cairo_surface_get_device:
 * @surface: a #cairo_surface_t
 *
 * This function returns the device for a @surface.
 * See #cairo_device_t.
 *
 * Return value: The device for @surface or %NULL if the surface does
 *               not have an associated device.
 *
 * Since: 1.10
 **/
cairo_device_t *
cairo_surface_get_device (cairo_surface_t *surface)
{
    if (unlikely (surface->status))
      return _cairo_device_create_in_error (surface->status);

    return surface->device;
}

static cairo_bool_t
_cairo_surface_has_snapshots (cairo_surface_t *surface)
{
    return ! cairo_list_is_empty (&surface->snapshots);
}

static cairo_bool_t
_cairo_surface_has_mime_data (cairo_surface_t *surface)
{
    return surface->mime_data.num_elements != 0;
}

static void
_cairo_surface_detach_mime_data (cairo_surface_t *surface)
{
    if (! _cairo_surface_has_mime_data (surface))
      return;

    _cairo_user_data_array_fini (&surface->mime_data);
    _cairo_user_data_array_init (&surface->mime_data);
}

static void
_cairo_surface_detach_snapshots (cairo_surface_t *surface)
{
    while (_cairo_surface_has_snapshots (surface)) {
      _cairo_surface_detach_snapshot (cairo_list_first_entry (&surface->snapshots,
                                                cairo_surface_t,
                                                snapshot));
    }
}

void
_cairo_surface_detach_snapshot (cairo_surface_t *snapshot)
{
    assert (snapshot->snapshot_of != NULL);

    snapshot->snapshot_of = NULL;
    cairo_list_del (&snapshot->snapshot);

    if (snapshot->snapshot_detach != NULL)
      snapshot->snapshot_detach (snapshot);

    cairo_surface_destroy (snapshot);
}

void
_cairo_surface_attach_snapshot (cairo_surface_t *surface,
                         cairo_surface_t *snapshot,
                         cairo_surface_func_t detach_func)
{
    assert (surface != snapshot);
    assert (snapshot->snapshot_of != surface);

    cairo_surface_reference (snapshot);

    if (snapshot->snapshot_of != NULL)
      _cairo_surface_detach_snapshot (snapshot);

    snapshot->snapshot_of = surface;
    snapshot->snapshot_detach = detach_func;

    cairo_list_add (&snapshot->snapshot, &surface->snapshots);

    assert (_cairo_surface_has_snapshot (surface, snapshot->backend) == snapshot);
}

cairo_surface_t *
_cairo_surface_has_snapshot (cairo_surface_t *surface,
                       const cairo_surface_backend_t *backend)
{
    cairo_surface_t *snapshot;

    cairo_list_foreach_entry (snapshot, cairo_surface_t,
                        &surface->snapshots, snapshot)
    {
      /* XXX is_similar? */
      if (snapshot->backend == backend)
          return snapshot;
    }

    return NULL;
}

static cairo_bool_t
_cairo_surface_is_writable (cairo_surface_t *surface)
{
    return ! surface->finished &&
         surface->snapshot_of == NULL &&
         ! _cairo_surface_has_snapshots (surface) &&
         ! _cairo_surface_has_mime_data (surface);
}

static void
_cairo_surface_begin_modification (cairo_surface_t *surface)
{
    assert (surface->status == CAIRO_STATUS_SUCCESS);
    assert (! surface->finished);
    assert (surface->snapshot_of == NULL);

    _cairo_surface_detach_snapshots (surface);
    _cairo_surface_detach_mime_data (surface);
}

void
_cairo_surface_init (cairo_surface_t                  *surface,
                 const cairo_surface_backend_t  *backend,
                 cairo_device_t                 *device,
                 cairo_content_t                 content)
{
    CAIRO_MUTEX_INITIALIZE ();

    surface->backend = backend;
    surface->device = cairo_device_reference (device);
    surface->content = content;
    surface->type = backend->type;

    CAIRO_REFERENCE_COUNT_INIT (&surface->ref_count, 1);
    surface->status = CAIRO_STATUS_SUCCESS;
    surface->unique_id = _cairo_surface_allocate_unique_id ();
    surface->finished = FALSE;
    surface->is_clear = FALSE;
    surface->owns_device = (device != NULL);

    _cairo_user_data_array_init (&surface->user_data);
    _cairo_user_data_array_init (&surface->mime_data);

    cairo_matrix_init_identity (&surface->device_transform);
    cairo_matrix_init_identity (&surface->device_transform_inverse);
    cairo_list_init (&surface->device_transform_observers);

    surface->x_resolution = CAIRO_SURFACE_RESOLUTION_DEFAULT;
    surface->y_resolution = CAIRO_SURFACE_RESOLUTION_DEFAULT;

    surface->x_fallback_resolution = CAIRO_SURFACE_FALLBACK_RESOLUTION_DEFAULT;
    surface->y_fallback_resolution = CAIRO_SURFACE_FALLBACK_RESOLUTION_DEFAULT;

    cairo_list_init (&surface->snapshots);
    surface->snapshot_of = NULL;

    surface->has_font_options = FALSE;
}

static void
_cairo_surface_copy_similar_properties (cairo_surface_t *surface,
                              cairo_surface_t *other)
{
    if (other->has_font_options || other->backend != surface->backend) {
      cairo_font_options_t options;

      cairo_surface_get_font_options (other, &options);
      _cairo_surface_set_font_options (surface, &options);
    }

    cairo_surface_set_fallback_resolution (surface,
                                 other->x_fallback_resolution,
                                 other->y_fallback_resolution);
}

cairo_surface_t *
_cairo_surface_create_similar_scratch (cairo_surface_t *other,
                               cairo_content_t  content,
                               int        width,
                               int        height)
{
    cairo_surface_t *surface;

    if (unlikely (other->status))
      return _cairo_surface_create_in_error (other->status);

    if (other->backend->create_similar == NULL)
      return NULL;

    surface = other->backend->create_similar (other,
                                    content, width, height);
    if (surface == NULL || surface->status)
      return surface;

    _cairo_surface_copy_similar_properties (surface, other);

    return surface;
}

/**
 * cairo_surface_create_similar:
 * @other: an existing surface used to select the backend of the new surface
 * @content: the content for the new surface
 * @width: width of the new surface, (in device-space units)
 * @height: height of the new surface (in device-space units)
 *
 * Create a new surface that is as compatible as possible with an
 * existing surface. For example the new surface will have the same
 * fallback resolution and font options as @other. Generally, the new
 * surface will also use the same backend as @other, unless that is
 * not possible for some reason. The type of the returned surface may
 * be examined with cairo_surface_get_type().
 *
 * Initially the surface contents are all 0 (transparent if contents
 * have transparency, black otherwise.)
 *
 * Return value: a pointer to the newly allocated surface. The caller
 * owns the surface and should call cairo_surface_destroy() when done
 * with it.
 *
 * This function always returns a valid pointer, but it will return a
 * pointer to a "nil" surface if @other is already in an error state
 * or any other error occurs.
 **/
cairo_surface_t *
cairo_surface_create_similar (cairo_surface_t  *other,
                        cairo_content_t   content,
                        int         width,
                        int         height)
{
    if (unlikely (other->status))
      return _cairo_surface_create_in_error (other->status);
    if (unlikely (other->finished))
      return _cairo_surface_create_in_error (CAIRO_STATUS_SURFACE_FINISHED);

    if (unlikely (! CAIRO_CONTENT_VALID (content)))
      return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_INVALID_CONTENT));

    return _cairo_surface_create_similar_solid (other,
                                    content, width, height,
                                    CAIRO_COLOR_TRANSPARENT,
                                    TRUE);
}

cairo_surface_t *
_cairo_surface_create_similar_solid (cairo_surface_t   *other,
                             cairo_content_t      content,
                             int            width,
                             int            height,
                             const cairo_color_t *color,
                             cairo_bool_t allow_fallback)
{
    cairo_status_t status;
    cairo_surface_t *surface;
    cairo_solid_pattern_t pattern;

    surface = _cairo_surface_create_similar_scratch (other, content,
                                         width, height);
    if (surface == NULL && allow_fallback)
      surface = _cairo_image_surface_create_with_content (content,
                                              width, height);
    if (surface == NULL || surface->status)
      return surface;

    _cairo_pattern_init_solid (&pattern, color);
    status = _cairo_surface_paint (surface,
                           color == CAIRO_COLOR_TRANSPARENT ?
                           CAIRO_OPERATOR_CLEAR : CAIRO_OPERATOR_SOURCE,
                           &pattern.base, NULL);
    if (unlikely (status)) {
      cairo_surface_destroy (surface);
      surface = _cairo_surface_create_in_error (status);
    }

    return surface;
}

cairo_surface_t *
_cairo_surface_create_solid_pattern_surface (cairo_surface_t         *other,
                                   const cairo_solid_pattern_t *solid_pattern)
{
    if (other->backend->create_solid_pattern_surface != NULL) {
      cairo_surface_t *surface;

      surface = other->backend->create_solid_pattern_surface (other,
                                                solid_pattern);
      if (surface)
          return surface;
    }

    return _cairo_surface_create_similar_solid (other,
                                    _cairo_color_get_content (&solid_pattern->color),
                                    1, 1,
                                    &solid_pattern->color,
                                    FALSE);
}

cairo_int_status_t
_cairo_surface_repaint_solid_pattern_surface (cairo_surface_t         *other,
                                    cairo_surface_t       *solid_surface,
                                    const cairo_solid_pattern_t *solid_pattern)
{
    /* Solid pattern surface for these backends are special and not trivial
     * to repaint.  Skip repainting.
     *
     * This does not work optimally with things like analysis surface that
     * are proxies.  But returning UNSUPPORTED is *safe* as it only
     * disables some caching.
     */
    if (other->backend->create_solid_pattern_surface != NULL &&
      ! other->backend->can_repaint_solid_pattern_surface (solid_surface,
                                               solid_pattern))
    {
      return CAIRO_INT_STATUS_UNSUPPORTED;
    }

    return _cairo_surface_paint (solid_surface,
                         CAIRO_OPERATOR_SOURCE,
                         &solid_pattern->base,
                         NULL);
}

/**
 * cairo_surface_reference:
 * @surface: a #cairo_surface_t
 *
 * Increases the reference count on @surface by one. This prevents
 * @surface from being destroyed until a matching call to
 * cairo_surface_destroy() is made.
 *
 * The number of references to a #cairo_surface_t can be get using
 * cairo_surface_get_reference_count().
 *
 * Return value: the referenced #cairo_surface_t.
 **/
cairo_surface_t *
cairo_surface_reference (cairo_surface_t *surface)
{
    if (surface == NULL ||
          CAIRO_REFERENCE_COUNT_IS_INVALID (&surface->ref_count))
      return surface;

    assert (CAIRO_REFERENCE_COUNT_HAS_REFERENCE (&surface->ref_count));

    _cairo_reference_count_inc (&surface->ref_count);

    return surface;
}
slim_hidden_def (cairo_surface_reference);

/**
 * cairo_surface_destroy:
 * @surface: a #cairo_surface_t
 *
 * Decreases the reference count on @surface by one. If the result is
 * zero, then @surface and all associated resources are freed.  See
 * cairo_surface_reference().
 **/
void
cairo_surface_destroy (cairo_surface_t *surface)
{
    if (surface == NULL ||
          CAIRO_REFERENCE_COUNT_IS_INVALID (&surface->ref_count))
      return;

    assert (CAIRO_REFERENCE_COUNT_HAS_REFERENCE (&surface->ref_count));

    if (! _cairo_reference_count_dec_and_test (&surface->ref_count))
      return;

    assert (surface->snapshot_of == NULL);

    if (! surface->finished)
      cairo_surface_finish (surface);

    /* paranoid check that nobody took a reference whilst finishing */
    assert (! CAIRO_REFERENCE_COUNT_HAS_REFERENCE (&surface->ref_count));

    _cairo_user_data_array_fini (&surface->user_data);
    _cairo_user_data_array_fini (&surface->mime_data);

    if (surface->owns_device)
        cairo_device_destroy (surface->device);

    free (surface);
}
slim_hidden_def(cairo_surface_destroy);

/**
 * cairo_surface_get_reference_count:
 * @surface: a #cairo_surface_t
 *
 * Returns the current reference count of @surface.
 *
 * Return value: the current reference count of @surface.  If the
 * object is a nil object, 0 will be returned.
 *
 * Since: 1.4
 **/
unsigned int
cairo_surface_get_reference_count (cairo_surface_t *surface)
{
    if (surface == NULL ||
          CAIRO_REFERENCE_COUNT_IS_INVALID (&surface->ref_count))
      return 0;

    return CAIRO_REFERENCE_COUNT_GET_VALUE (&surface->ref_count);
}

/**
 * cairo_surface_finish:
 * @surface: the #cairo_surface_t to finish
 *
 * This function finishes the surface and drops all references to
 * external resources.  For example, for the Xlib backend it means
 * that cairo will no longer access the drawable, which can be freed.
 * After calling cairo_surface_finish() the only valid operations on a
 * surface are getting and setting user, referencing and
 * destroying, and flushing and finishing it.
 * Further drawing to the surface will not affect the
 * surface but will instead trigger a %CAIRO_STATUS_SURFACE_FINISHED
 * error.
 *
 * When the last call to cairo_surface_destroy() decreases the
 * reference count to zero, cairo will call cairo_surface_finish() if
 * it hasn't been called already, before freeing the resources
 * associated with the surface.
 **/
void
cairo_surface_finish (cairo_surface_t *surface)
{
    cairo_status_t status;

    if (surface == NULL)
      return;

    if (CAIRO_REFERENCE_COUNT_IS_INVALID (&surface->ref_count))
      return;

    if (surface->finished)
      return;

    /* update the snapshots *before* we declare the surface as finished */
    _cairo_surface_detach_snapshots (surface);
    if (surface->snapshot_of != NULL)
      _cairo_surface_detach_snapshot (surface);

    cairo_surface_flush (surface);
    surface->finished = TRUE;

    /* call finish even if in error mode */
    if (surface->backend->finish) {
      status = surface->backend->finish (surface);
      if (unlikely (status))
          status = _cairo_surface_set_error (surface, status);
    }
}
slim_hidden_def (cairo_surface_finish);

/**
 * _cairo_surface_release_device_reference:
 * @surface: a #cairo_surface_t
 *
 * This function makes @surface release the reference to its device. The
 * function is intended to be used for avoiding cycling references for
 * surfaces that are owned by their device, for example cache surfaces.
 * Note that the @surface will still assume that the device is available.
 * So it is the caller's responsibility to ensure the device stays around
 * until the @surface is destroyed. Just calling cairo_surface_finish() is
 * not enough.
 **/
void
_cairo_surface_release_device_reference (cairo_surface_t *surface)
{
    assert (surface->owns_device);

    cairo_device_destroy (surface->device);
    surface->owns_device = FALSE;
}

/**
 * cairo_surface_get_user_data:
 * @surface: a #cairo_surface_t
 * @key: the address of the #cairo_user_data_key_t the user data was
 * attached to
 *
 * Return user data previously attached to @surface using the specified
 * key.  If no user data has been attached with the given key this
 * function returns %NULL.
 *
 * Return value: the user data previously attached or %NULL.
 **/
void *
cairo_surface_get_user_data (cairo_surface_t           *surface,
                       const cairo_user_data_key_t *key)
{
    return _cairo_user_data_array_get_data (&surface->user_data,
                                  key);
}

/**
 * cairo_surface_set_user_data:
 * @surface: a #cairo_surface_t
 * @key: the address of a #cairo_user_data_key_t to attach the user data to
 * @user_data: the user data to attach to the surface
 * @destroy: a #cairo_destroy_func_t which will be called when the
 * surface is destroyed or when new user data is attached using the
 * same key.
 *
 * Attach user data to @surface.  To remove user data from a surface,
 * call this function with the key that was used to set it and %NULL
 * for @data.
 *
 * Return value: %CAIRO_STATUS_SUCCESS or %CAIRO_STATUS_NO_MEMORY if a
 * slot could not be allocated for the user data.
 **/
cairo_status_t
cairo_surface_set_user_data (cairo_surface_t           *surface,
                       const cairo_user_data_key_t *key,
                       void                *user_data,
                       cairo_destroy_func_t      destroy)
{
    if (CAIRO_REFERENCE_COUNT_IS_INVALID (&surface->ref_count))
      return surface->status;

    return _cairo_user_data_array_set_data (&surface->user_data,
                                  key, user_data, destroy);
}

/**
 * cairo_surface_get_mime_data:
 * @surface: a #cairo_surface_t
 * @mime_type: the mime type of the image data
 * @data: the image data to attached to the surface
 * @length: the length of the image data
 *
 * Return mime data previously attached to @surface using the
 * specified mime type.  If no data has been attached with the given
 * mime type, @data is set %NULL.
 *
 * Since: 1.10
 **/
void
cairo_surface_get_mime_data (cairo_surface_t          *surface,
                             const char               *mime_type,
                             const unsigned char       **data,
                             unsigned long            *length)
{
    cairo_user_data_slot_t *slots;
    int i, num_slots;

    *data = NULL;
    *length = 0;
    if (unlikely (surface->status))
      return;

    /* The number of mime-types attached to a surface is usually small,
     * typically zero. Therefore it is quicker to do a strcmp() against
     * each key than it is to intern the string (i.e. compute a hash,
     * search the hash table, and do a final strcmp).
     */
    num_slots = surface->mime_data.num_elements;
    slots = _cairo_array_index (&surface->mime_data, 0);
    for (i = 0; i < num_slots; i++) {
      if (strcmp ((char *) slots[i].key, mime_type) == 0) {
          cairo_mime_data_t *mime_data = slots[i].user_data;

          *data = mime_data->data;
          *length = mime_data->length;
          return;
      }
    }
}
slim_hidden_def (cairo_surface_get_mime_data);

static void
_cairo_mime_data_destroy (void *ptr)
{
    cairo_mime_data_t *mime_data = ptr;

    if (! _cairo_reference_count_dec_and_test (&mime_data->ref_count))
      return;

    if (mime_data->destroy && mime_data->closure)
      mime_data->destroy (mime_data->closure);

    free (mime_data);
}

/**
 * CAIRO_MIME_TYPE_JP2:
 *
 * The Joint Photographic Experts Group (JPEG) 2000 image coding standard (ISO/IEC 15444-1).
 *
 * @Since: 1.10
 */

/**
 * CAIRO_MIME_TYPE_JPEG:
 *
 * The Joint Photographic Experts Group (JPEG) image coding standard (ISO/IEC 10918-1).
 *
 * @Since: 1.10
 */

/**
 * CAIRO_MIME_TYPE_PNG:
 *
 * The Portable Network Graphics image file format (ISO/IEC 15948).
 *
 * @Since: 1.10
 */

/**
 * CAIRO_MIME_TYPE_URI:
 *
 * URI for an image file (unofficial MIME type).
 *
 * @Since: 1.10
 */

/**
 * cairo_surface_set_mime_data:
 * @surface: a #cairo_surface_t
 * @mime_type: the MIME type of the image data
 * @data: the image data to attach to the surface
 * @length: the length of the image data
 * @destroy: a #cairo_destroy_func_t which will be called when the
 * surface is destroyed or when new image data is attached using the
 * same mime type.
 * @closure: the data to be passed to the @destroy notifier
 *
 * Attach an image in the format @mime_type to @surface. To remove
 * the data from a surface, call this function with same mime type
 * and %NULL for @data.
 *
 * The attached image (or filename) data can later be used by backends
 * which support it (currently: PDF, PS, SVG and Win32 Printing
 * surfaces) to emit this data instead of making a snapshot of the
 * @surface.  This approach tends to be faster and requires less
 * memory and disk space.
 *
 * The recognized MIME types are the following: %CAIRO_MIME_TYPE_JPEG,
 * %CAIRO_MIME_TYPE_PNG, %CAIRO_MIME_TYPE_JP2, %CAIRO_MIME_TYPE_URI.
 *
 * See corresponding backend surface docs for details about which MIME
 * types it can handle. Caution: the associated MIME data will be
 * discarded if you draw on the surface afterwards. Use this function
 * with care.
 *
 * Since: 1.10
 *
 * Return value: %CAIRO_STATUS_SUCCESS or %CAIRO_STATUS_NO_MEMORY if a
 * slot could not be allocated for the user data.
 **/
cairo_status_t
cairo_surface_set_mime_data (cairo_surface_t          *surface,
                             const char               *mime_type,
                             const unsigned char      *data,
                             unsigned long             length,
                       cairo_destroy_func_t      destroy,
                       void               *closure)
{
    cairo_status_t status;
    cairo_mime_data_t *mime_data;

    if (unlikely (surface->status))
      return surface->status;
    if (surface->finished)
      return _cairo_surface_set_error (surface, _cairo_error (CAIRO_STATUS_SURFACE_FINISHED));

    status = _cairo_intern_string (&mime_type, -1);
    if (unlikely (status))
      return _cairo_surface_set_error (surface, status);

    if (data != NULL) {
      mime_data = malloc (sizeof (cairo_mime_data_t));
      if (unlikely (mime_data == NULL))
          return _cairo_surface_set_error (surface, _cairo_error (CAIRO_STATUS_NO_MEMORY));

      CAIRO_REFERENCE_COUNT_INIT (&mime_data->ref_count, 1);

      mime_data->data = (unsigned char *) data;
      mime_data->length = length;
      mime_data->destroy = destroy;
      mime_data->closure = closure;
    } else
      mime_data = NULL;

    status = _cairo_user_data_array_set_data (&surface->mime_data,
                                    (cairo_user_data_key_t *) mime_type,
                                    mime_data,
                                    _cairo_mime_data_destroy);
    if (unlikely (status)) {
      if (mime_data != NULL)
          free (mime_data);

      return _cairo_surface_set_error (surface, status);
    }

    return CAIRO_STATUS_SUCCESS;
}
slim_hidden_def (cairo_surface_set_mime_data);

static void
_cairo_mime_data_reference (const void *key, void *elt, void *closure)
{
    cairo_mime_data_t *mime_data = elt;

    _cairo_reference_count_inc (&mime_data->ref_count);
}

cairo_status_t
_cairo_surface_copy_mime_data (cairo_surface_t *dst,
                         cairo_surface_t *src)
{
    cairo_status_t status;

    if (dst->status)
      return dst->status;

    if (src->status)
      return _cairo_surface_set_error (dst, src->status);

    /* first copy the mime-data, discarding any already set on dst */
    status = _cairo_user_data_array_copy (&dst->mime_data, &src->mime_data);
    if (unlikely (status))
      return _cairo_surface_set_error (dst, status);

    /* now increment the reference counters for the copies */
    _cairo_user_data_array_foreach (&dst->mime_data,
                            _cairo_mime_data_reference,
                            NULL);

    return CAIRO_STATUS_SUCCESS;
}

/**
 * _cairo_surface_set_font_options:
 * @surface: a #cairo_surface_t
 * @options: a #cairo_font_options_t object that contains the
 *   options to use for this surface instead of backend's default
 *   font options.
 *
 * Sets the default font rendering options for the surface.
 * This is useful to correctly propagate default font options when
 * falling back to an image surface in a backend implementation.
 * This affects the options returned in cairo_surface_get_font_options().
 *
 * If @options is %NULL the surface options are reset to those of
 * the backend default.
 **/
void
_cairo_surface_set_font_options (cairo_surface_t       *surface,
                         cairo_font_options_t  *options)
{
    cairo_status_t status;

    if (surface->status)
      return;

    assert (surface->snapshot_of == NULL);

    if (surface->finished) {
      status = _cairo_surface_set_error (surface,
                                       _cairo_error (CAIRO_STATUS_SURFACE_FINISHED));
      return;
    }

    if (options) {
      surface->has_font_options = TRUE;
      _cairo_font_options_init_copy (&surface->font_options, options);
    } else {
      surface->has_font_options = FALSE;
    }
}

/**
 * cairo_surface_get_font_options:
 * @surface: a #cairo_surface_t
 * @options: a #cairo_font_options_t object into which to store
 *   the retrieved options. All existing values are overwritten
 *
 * Retrieves the default font rendering options for the surface.
 * This allows display surfaces to report the correct subpixel order
 * for rendering on them, print surfaces to disable hinting of
 * metrics and so forth. The result can then be used with
 * cairo_scaled_font_create().
 **/
void
cairo_surface_get_font_options (cairo_surface_t       *surface,
                        cairo_font_options_t  *options)
{
    if (cairo_font_options_status (options))
      return;

    if (surface->status) {
      _cairo_font_options_init_default (options);
      return;
    }

    if (! surface->has_font_options) {
      surface->has_font_options = TRUE;

      _cairo_font_options_init_default (&surface->font_options);

      if (!surface->finished && surface->backend->get_font_options) {
          surface->backend->get_font_options (surface, &surface->font_options);
      }
    }

    _cairo_font_options_init_copy (options, &surface->font_options);
}
slim_hidden_def (cairo_surface_get_font_options);

/**
 * cairo_surface_flush:
 * @surface: a #cairo_surface_t
 *
 * Do any pending drawing for the surface and also restore any
 * temporary modifications cairo has made to the surface's
 * state. This function must be called before switching from
 * drawing on the surface with cairo to drawing on it directly
 * with native APIs. If the surface doesn't support direct access,
 * then this function does nothing.
 **/
void
cairo_surface_flush (cairo_surface_t *surface)
{
    cairo_status_t status;

    if (surface->status)
      return;

    if (surface->finished)
      return;

    /* update the current snapshots *before* the user updates the surface */
    _cairo_surface_detach_snapshots (surface);

    if (surface->backend->flush) {
      status = surface->backend->flush (surface);
      if (unlikely (status))
          status = _cairo_surface_set_error (surface, status);
    }
}
slim_hidden_def (cairo_surface_flush);

/**
 * cairo_surface_mark_dirty:
 * @surface: a #cairo_surface_t
 *
 * Tells cairo that drawing has been done to surface using means other
 * than cairo, and that cairo should reread any cached areas. Note
 * that you must call cairo_surface_flush() before doing such drawing.
 */
void
cairo_surface_mark_dirty (cairo_surface_t *surface)
{
    cairo_surface_mark_dirty_rectangle (surface, 0, 0, -1, -1);
}
slim_hidden_def (cairo_surface_mark_dirty);

/**
 * cairo_surface_mark_dirty_rectangle:
 * @surface: a #cairo_surface_t
 * @x: X coordinate of dirty rectangle
 * @y: Y coordinate of dirty rectangle
 * @width: width of dirty rectangle
 * @height: height of dirty rectangle
 *
 * Like cairo_surface_mark_dirty(), but drawing has been done only to
 * the specified rectangle, so that cairo can retain cached contents
 * for other parts of the surface.
 *
 * Any cached clip set on the surface will be reset by this function,
 * to make sure that future cairo calls have the clip set that they
 * expect.
 */
void
cairo_surface_mark_dirty_rectangle (cairo_surface_t *surface,
                            int              x,
                            int              y,
                            int              width,
                            int              height)
{
    cairo_status_t status;

    if (surface->status)
      return;

    assert (surface->snapshot_of == NULL);

    if (surface->finished) {
      status = _cairo_surface_set_error (surface, _cairo_error (CAIRO_STATUS_SURFACE_FINISHED));
      return;
    }

    /* The application *should* have called cairo_surface_flush() before
     * modifying the surface independently of cairo (and thus having to
     * call mark_dirty()). */
    assert (! _cairo_surface_has_snapshots (surface));
    assert (! _cairo_surface_has_mime_data (surface));

    surface->is_clear = FALSE;

    if (surface->backend->mark_dirty_rectangle != NULL) {
      /* XXX: FRAGILE: We're ignoring the scaling component of
       * device_transform here. I don't know what the right thing to
       * do would actually be if there were some scaling here, but
       * we avoid this since device_transfom scaling is not exported
       * publicly and mark_dirty is not used internally. */
      status = surface->backend->mark_dirty_rectangle (surface,
                                                         x + surface->device_transform.x0,
                                                         y + surface->device_transform.y0,
                                           width, height);

      if (unlikely (status))
          status = _cairo_surface_set_error (surface, status);
    }
}
slim_hidden_def (cairo_surface_mark_dirty_rectangle);

/**
 * _cairo_surface_set_device_scale:
 * @surface: a #cairo_surface_t
 * @sx: a scale factor in the X direction
 * @sy: a scale factor in the Y direction
 *
 * Private function for setting an extra scale factor to affect all
 * drawing to a surface. This is used, for example, when replaying a
 * recording surface to an image fallback intended for an eventual
 * vector-oriented backend. Since the recording surface will record
 * coordinates in one backend space, but the image fallback uses a
 * different backend space, (differing by the fallback resolution
 * scale factors), we need a scale factor correction.
 *
 * Caution: Not all places we use device transform correctly handle
 * both a translate and a scale.  An audit would be nice.
 **/
void
_cairo_surface_set_device_scale (cairo_surface_t *surface,
                         double             sx,
                         double             sy)
{
    cairo_status_t status;

    if (surface->status)
      return;

    assert (surface->snapshot_of == NULL);

    if (surface->finished) {
      status = _cairo_surface_set_error (surface, _cairo_error (CAIRO_STATUS_SURFACE_FINISHED));
      return;
    }

    _cairo_surface_begin_modification (surface);

    surface->device_transform.xx = sx;
    surface->device_transform.yy = sy;
    surface->device_transform.xy = 0.0;
    surface->device_transform.yx = 0.0;

    surface->device_transform_inverse = surface->device_transform;
    status = cairo_matrix_invert (&surface->device_transform_inverse);
    /* should always be invertible unless given pathological input */
    assert (status == CAIRO_STATUS_SUCCESS);

    _cairo_observers_notify (&surface->device_transform_observers, surface);
}

/**
 * cairo_surface_set_device_offset:
 * @surface: a #cairo_surface_t
 * @x_offset: the offset in the X direction, in device units
 * @y_offset: the offset in the Y direction, in device units
 *
 * Sets an offset that is added to the device coordinates determined
 * by the CTM when drawing to @surface. One use case for this function
 * is when we want to create a #cairo_surface_t that redirects drawing
 * for a portion of an onscreen surface to an offscreen surface in a
 * way that is completely invisible to the user of the cairo
 * API. Setting a transformation via cairo_translate() isn't
 * sufficient to do this, since functions like
 * cairo_device_to_user() will expose the hidden offset.
 *
 * Note that the offset affects drawing to the surface as well as
 * using the surface in a source pattern.
 **/
void
cairo_surface_set_device_offset (cairo_surface_t *surface,
                         double           x_offset,
                         double           y_offset)
{
    cairo_status_t status;

    if (surface->status)
      return;

    assert (surface->snapshot_of == NULL);

    if (surface->finished) {
      status = _cairo_surface_set_error (surface, _cairo_error (CAIRO_STATUS_SURFACE_FINISHED));
      return;
    }

    _cairo_surface_begin_modification (surface);

    surface->device_transform.x0 = x_offset;
    surface->device_transform.y0 = y_offset;

    surface->device_transform_inverse = surface->device_transform;
    status = cairo_matrix_invert (&surface->device_transform_inverse);
    /* should always be invertible unless given pathological input */
    assert (status == CAIRO_STATUS_SUCCESS);

    _cairo_observers_notify (&surface->device_transform_observers, surface);
}
slim_hidden_def (cairo_surface_set_device_offset);

/**
 * cairo_surface_get_device_offset:
 * @surface: a #cairo_surface_t
 * @x_offset: the offset in the X direction, in device units
 * @y_offset: the offset in the Y direction, in device units
 *
 * This function returns the previous device offset set by
 * cairo_surface_set_device_offset().
 *
 * Since: 1.2
 **/
void
cairo_surface_get_device_offset (cairo_surface_t *surface,
                         double          *x_offset,
                         double          *y_offset)
{
    if (x_offset)
      *x_offset = surface->device_transform.x0;
    if (y_offset)
      *y_offset = surface->device_transform.y0;
}
slim_hidden_def (cairo_surface_get_device_offset);

/**
 * cairo_surface_set_fallback_resolution:
 * @surface: a #cairo_surface_t
 * @x_pixels_per_inch: horizontal setting for pixels per inch
 * @y_pixels_per_inch: vertical setting for pixels per inch
 *
 * Set the horizontal and vertical resolution for image fallbacks.
 *
 * When certain operations aren't supported natively by a backend,
 * cairo will fallback by rendering operations to an image and then
 * overlaying that image onto the output. For backends that are
 * natively vector-oriented, this function can be used to set the
 * resolution used for these image fallbacks, (larger values will
 * result in more detailed images, but also larger file sizes).
 *
 * Some examples of natively vector-oriented backends are the ps, pdf,
 * and svg backends.
 *
 * For backends that are natively raster-oriented, image fallbacks are
 * still possible, but they are always performed at the native
 * device resolution. So this function has no effect on those
 * backends.
 *
 * Note: The fallback resolution only takes effect at the time of
 * completing a page (with cairo_show_page() or cairo_copy_page()) so
 * there is currently no way to have more than one fallback resolution
 * in effect on a single page.
 *
 * The default fallback resoultion is 300 pixels per inch in both
 * dimensions.
 *
 * Since: 1.2
 **/
void
cairo_surface_set_fallback_resolution (cairo_surface_t      *surface,
                               double            x_pixels_per_inch,
                               double            y_pixels_per_inch)
{
    cairo_status_t status;

    if (surface->status)
      return;

    assert (surface->snapshot_of == NULL);

    if (surface->finished) {
      status = _cairo_surface_set_error (surface, _cairo_error (CAIRO_STATUS_SURFACE_FINISHED));
      return;
    }

    if (x_pixels_per_inch <= 0 || y_pixels_per_inch <= 0) {
      /* XXX Could delay raising the error until we fallback, but throwing
       * the error here means that we can catch the real culprit.
       */
      status = _cairo_surface_set_error (surface, CAIRO_STATUS_INVALID_MATRIX);
      return;
    }

    _cairo_surface_begin_modification (surface);

    surface->x_fallback_resolution = x_pixels_per_inch;
    surface->y_fallback_resolution = y_pixels_per_inch;
}
slim_hidden_def (cairo_surface_set_fallback_resolution);

/**
 * cairo_surface_get_fallback_resolution:
 * @surface: a #cairo_surface_t
 * @x_pixels_per_inch: horizontal pixels per inch
 * @y_pixels_per_inch: vertical pixels per inch
 *
 * This function returns the previous fallback resolution set by
 * cairo_surface_set_fallback_resolution(), or default fallback
 * resolution if never set.
 *
 * Since: 1.8
 **/
void
cairo_surface_get_fallback_resolution (cairo_surface_t      *surface,
                               double           *x_pixels_per_inch,
                               double           *y_pixels_per_inch)
{
    if (x_pixels_per_inch)
      *x_pixels_per_inch = surface->x_fallback_resolution;
    if (y_pixels_per_inch)
      *y_pixels_per_inch = surface->y_fallback_resolution;
}

cairo_bool_t
_cairo_surface_has_device_transform (cairo_surface_t *surface)
{
    return ! _cairo_matrix_is_identity (&surface->device_transform);
}

/**
 * _cairo_surface_acquire_source_image:
 * @surface: a #cairo_surface_t
 * @image_out: location to store a pointer to an image surface that
 *    has identical contents to @surface. This surface could be @surface
 *    itself, a surface held internal to @surface, or it could be a new
 *    surface with a copy of the relevant portion of @surface.
 * @image_extra: location to store image specific backend data
 *
 * Gets an image surface to use when drawing as a fallback when drawing with
 * @surface as a source. _cairo_surface_release_source_image() must be called
 * when finished.
 *
 * Return value: %CAIRO_STATUS_SUCCESS if an image was stored in @image_out.
 * %CAIRO_INT_STATUS_UNSUPPORTED if an image cannot be retrieved for the specified
 * surface. Or %CAIRO_STATUS_NO_MEMORY.
 **/
cairo_status_t
_cairo_surface_acquire_source_image (cairo_surface_t         *surface,
                             cairo_image_surface_t  **image_out,
                             void                   **image_extra)
{
    cairo_status_t status;

    if (surface->status)
      return surface->status;

    assert (!surface->finished);

    if (surface->backend->acquire_source_image == NULL)
      return CAIRO_INT_STATUS_UNSUPPORTED;

    status = surface->backend->acquire_source_image (surface,
                                         image_out, image_extra);
    if (unlikely (status))
      return _cairo_surface_set_error (surface, status);

    _cairo_debug_check_image_surface_is_defined (&(*image_out)->base);

    return CAIRO_STATUS_SUCCESS;
}

/**
 * _cairo_surface_release_source_image:
 * @surface: a #cairo_surface_t
 * @image_extra: same as return from the matching _cairo_surface_acquire_source_image()
 *
 * Releases any resources obtained with _cairo_surface_acquire_source_image()
 **/
void
_cairo_surface_release_source_image (cairo_surface_t        *surface,
                             cairo_image_surface_t  *image,
                             void                   *image_extra)
{
    assert (!surface->finished);

    if (surface->backend->release_source_image)
      surface->backend->release_source_image (surface, image, image_extra);
}

/**
 * _cairo_surface_acquire_dest_image:
 * @surface: a #cairo_surface_t
 * @interest_rect: area of @surface for which fallback drawing is being done.
 *    A value of %NULL indicates that the entire surface is desired.
 *    XXXX I'd like to get rid of being able to pass %NULL here (nothing seems to)
 * @image_out: location to store a pointer to an image surface that includes at least
 *    the intersection of @interest_rect with the visible area of @surface.
 *    This surface could be @surface itself, a surface held internal to @surface,
 *    or it could be a new surface with a copy of the relevant portion of @surface.
 *    If a new surface is created, it should have the same channels and depth
 *    as @surface so that copying to and from it is exact.
 * @image_rect: location to store area of the original surface occupied
 *    by the surface stored in @image.
 * @image_extra: location to store image specific backend data
 *
 * Retrieves a local image for a surface for implementing a fallback drawing
 * operation. After calling this function, the implementation of the fallback
 * drawing operation draws the primitive to the surface stored in @image_out
 * then calls _cairo_surface_release_dest_image(),
 * which, if a temporary surface was created, copies the bits back to the
 * main surface and frees the temporary surface.
 *
 * Return value: %CAIRO_STATUS_SUCCESS or %CAIRO_STATUS_NO_MEMORY.
 *  %CAIRO_INT_STATUS_UNSUPPORTED can be returned but this will mean that
 *  the backend can't draw with fallbacks. It's possible for the routine
 *  to store %NULL in @local_out and return %CAIRO_STATUS_SUCCESS;
 *  that indicates that no part of @interest_rect is visible, so no drawing
 *  is necessary. _cairo_surface_release_dest_image() should not be called in that
 *  case.
 **/
cairo_status_t
_cairo_surface_acquire_dest_image (cairo_surface_t         *surface,
                           cairo_rectangle_int_t   *interest_rect,
                           cairo_image_surface_t  **image_out,
                           cairo_rectangle_int_t   *image_rect,
                           void                   **image_extra)
{
    cairo_status_t status;

    if (surface->status)
      return surface->status;

    assert (_cairo_surface_is_writable (surface));

    if (surface->backend->acquire_dest_image == NULL)
      return CAIRO_INT_STATUS_UNSUPPORTED;

    status = surface->backend->acquire_dest_image (surface,
                                       interest_rect,
                                       image_out,
                                       image_rect,
                                       image_extra);
    if (unlikely (status))
      return _cairo_surface_set_error (surface, status);

    _cairo_debug_check_image_surface_is_defined (&(*image_out)->base);

    return CAIRO_STATUS_SUCCESS;
}

/**
 * _cairo_surface_release_dest_image:
 * @surface: a #cairo_surface_t
 * @interest_rect: same as passed to the matching _cairo_surface_acquire_dest_image()
 * @image: same as returned from the matching _cairo_surface_acquire_dest_image()
 * @image_rect: same as returned from the matching _cairo_surface_acquire_dest_image()
 * @image_extra: same as return from the matching _cairo_surface_acquire_dest_image()
 *
 * Finishes the operation started with _cairo_surface_acquire_dest_image(), by, if
 * necessary, copying the image from @image back to @surface and freeing any
 * resources that were allocated.
 **/
void
_cairo_surface_release_dest_image (cairo_surface_t         *surface,
                           cairo_rectangle_int_t   *interest_rect,
                           cairo_image_surface_t   *image,
                           cairo_rectangle_int_t   *image_rect,
                           void                    *image_extra)
{
    assert (_cairo_surface_is_writable (surface));

    if (surface->backend->release_dest_image)
      surface->backend->release_dest_image (surface, interest_rect,
                                    image, image_rect, image_extra);
}

static cairo_status_t
_cairo_recording_surface_clone_similar (cairo_surface_t  *surface,
                              cairo_surface_t  *src,
                              int               src_x,
                              int               src_y,
                              int               width,
                              int               height,
                              int              *clone_offset_x,
                              int              *clone_offset_y,
                              cairo_surface_t **clone_out)
{
    cairo_recording_surface_t *recorder = (cairo_recording_surface_t *) src;
    cairo_surface_t *similar;
    cairo_status_t status;

    similar = _cairo_surface_has_snapshot (src, surface->backend);
    if (similar != NULL) {
      *clone_out = cairo_surface_reference (similar);
      *clone_offset_x = 0;
      *clone_offset_y = 0;
      return CAIRO_STATUS_SUCCESS;
    }

    if (recorder->unbounded ||
      width*height*8 < recorder->extents.width*recorder->extents.height)
    {
      similar = _cairo_surface_create_similar_solid (surface,
                                           src->content,
                                           width, height,
                                                       CAIRO_COLOR_TRANSPARENT,
                                                       FALSE);
      if (similar == NULL)
          return CAIRO_INT_STATUS_UNSUPPORTED;
      if (unlikely (similar->status))
          return similar->status;

      cairo_surface_set_device_offset (similar, -src_x, -src_y);

      status = _cairo_recording_surface_replay (src, similar);
      if (unlikely (status)) {
          cairo_surface_destroy (similar);
          return status;
      }
    } else {
      similar = _cairo_surface_create_similar_scratch (surface,
                                           src->content,
                                           recorder->extents.width,
                                           recorder->extents.height);
      if (similar == NULL)
          return CAIRO_INT_STATUS_UNSUPPORTED;
      if (unlikely (similar->status))
          return similar->status;

      status = _cairo_recording_surface_replay (src, similar);
      if (unlikely (status)) {
          cairo_surface_destroy (similar);
          return status;
      }

      _cairo_surface_attach_snapshot (src, similar, NULL);

      src_x = src_y = 0;
    }

    *clone_out = similar;
    *clone_offset_x = src_x;
    *clone_offset_y = src_y;
    return CAIRO_STATUS_SUCCESS;
}

/**
 * _cairo_surface_clone_similar:
 * @surface: a #cairo_surface_t
 * @src: the source image
 * @content: target content mask
 * @src_x: extent for the rectangle in src we actually care about
 * @src_y: extent for the rectangle in src we actually care about
 * @width: extent for the rectangle in src we actually care about
 * @height: extent for the rectangle in src we actually care about
 * @clone_out: location to store a surface compatible with @surface
 *   and with contents identical to @src. The caller must call
 *   cairo_surface_destroy() on the result.
 *
 * Creates a surface with contents identical to @src but that
 *   can be used efficiently with @surface. If @surface and @src are
 *   already compatible then it may return a new reference to @src.
 *
 * Return value: %CAIRO_STATUS_SUCCESS if a surface was created and stored
 *   in @clone_out. Otherwise %CAIRO_INT_STATUS_UNSUPPORTED or another
 *   error like %CAIRO_STATUS_NO_MEMORY.
 **/
cairo_status_t
_cairo_surface_clone_similar (cairo_surface_t  *surface,
                        cairo_surface_t  *src,
                        int               src_x,
                        int               src_y,
                        int               width,
                        int               height,
                        int              *clone_offset_x,
                        int              *clone_offset_y,
                        cairo_surface_t **clone_out)
{
    cairo_status_t status = CAIRO_INT_STATUS_UNSUPPORTED;
    cairo_image_surface_t *image;
    void *image_extra;

    if (unlikely (surface->status))
      return surface->status;

    if (unlikely (surface->finished))
      return _cairo_error (CAIRO_STATUS_SURFACE_FINISHED);

#if CAIRO_HAS_TEE_SURFACE

    if (src->type == CAIRO_SURFACE_TYPE_TEE) {
      cairo_surface_t *match;

      match = _cairo_tee_surface_find_match (src,
                                     surface->backend,
                                     src->content);
      if (match != NULL)
          src = match;
    }

#endif

    if (surface->backend->clone_similar != NULL) {
      status = surface->backend->clone_similar (surface, src,
                                      src_x, src_y,
                                      width, height,
                                      clone_offset_x,
                                      clone_offset_y,
                                      clone_out);
      if (status == CAIRO_INT_STATUS_UNSUPPORTED) {
          if (_cairo_surface_is_image (src))
            return CAIRO_INT_STATUS_UNSUPPORTED;

          /* First check to see if we can replay to a similar surface */
          if (_cairo_surface_is_recording (src)) {
            return _cairo_recording_surface_clone_similar (surface, src,
                                                 src_x, src_y,
                                                 width, height,
                                                 clone_offset_x,
                                                 clone_offset_y,
                                                 clone_out);
          }

          /* If we failed, try again with an image surface */
          status = _cairo_surface_acquire_source_image (src, &image, &image_extra);
          if (status == CAIRO_STATUS_SUCCESS) {
            status =
                surface->backend->clone_similar (surface, &image->base,
                                         src_x, src_y,
                                         width, height,
                                         clone_offset_x,
                                         clone_offset_y,
                                         clone_out);

            _cairo_surface_release_source_image (src, image, image_extra);
          }
      }
    }

    /* If we're still unsupported, hit our fallback path to get a clone */
    if (status == CAIRO_INT_STATUS_UNSUPPORTED) {
      status =
          _cairo_surface_fallback_clone_similar (surface, src,
                                       src_x, src_y,
                                       width, height,
                                       clone_offset_x,
                                       clone_offset_y,
                                       clone_out);
    }

    if (unlikely (status))
      return status;

    /* Update the clone's device_transform (which the underlying surface
     * backend knows nothing about) */
    if (*clone_out != src) {
      (*clone_out)->device_transform = src->device_transform;
      (*clone_out)->device_transform_inverse = src->device_transform_inverse;
    }

    return status;
}

/**
 * _cairo_surface_is_similar
 * @surface_a: a #cairo_surface_t
 * @surface_b: a #cairo_surface_t
 * @content: a #cairo_content_t
 *
 * Find out whether the given surfaces share the same backend,
 * and if so, whether they can be considered similar.
 *
 * The definition of "similar" depends on the backend. In
 * general, it means that the surface is equivalent to one
 * that would have been generated by a call to cairo_surface_create_similar().
 *
 * Return value: %TRUE if the surfaces are similar.
 **/
cairo_bool_t
_cairo_surface_is_similar (cairo_surface_t *surface_a,
                         cairo_surface_t *surface_b)
{
    if (surface_a->backend != surface_b->backend)
      return FALSE;

    if (surface_a->backend->is_similar != NULL)
      return surface_a->backend->is_similar (surface_a, surface_b);

    return TRUE;
}

cairo_status_t
_cairo_surface_composite (cairo_operator_t      op,
                    const cairo_pattern_t *src,
                    const cairo_pattern_t *mask,
                    cairo_surface_t *dst,
                    int             src_x,
                    int             src_y,
                    int             mask_x,
                    int             mask_y,
                    int             dst_x,
                    int             dst_y,
                    unsigned int          width,
                    unsigned int          height,
                    cairo_region_t  *clip_region)
{
    cairo_int_status_t status;

    if (unlikely (dst->status))
      return dst->status;

    assert (_cairo_surface_is_writable (dst));

    if (mask) {
      /* These operators aren't interpreted the same way by the backends;
       * they are implemented in terms of other operators in cairo-gstate.c
       */
      assert (op != CAIRO_OPERATOR_SOURCE && op != CAIRO_OPERATOR_CLEAR);
    }

    if (dst->backend->composite) {
      status = dst->backend->composite (op,
                                src, mask, dst,
                                          src_x, src_y,
                                          mask_x, mask_y,
                                          dst_x, dst_y,
                                width, height,
                                clip_region);
      if (status != CAIRO_INT_STATUS_UNSUPPORTED)
          return _cairo_surface_set_error (dst, status);
    }

    return _cairo_surface_set_error (dst,
          _cairo_surface_fallback_composite (op,
                                    src, mask, dst,
                                    src_x, src_y,
                                    mask_x, mask_y,
                                    dst_x, dst_y,
                                    width, height,
                                    clip_region));
}

/**
 * _cairo_surface_fill_rectangle:
 * @surface: a #cairo_surface_t
 * @op: the operator to apply to the rectangle
 * @color: the source color
 * @x: X coordinate of rectangle, in backend coordinates
 * @y: Y coordinate of rectangle, in backend coordinates
 * @width: width of rectangle, in backend coordinates
 * @height: height of rectangle, in backend coordinates
 *
 * Applies an operator to a rectangle using a solid color as the source.
 * See _cairo_surface_fill_rectangles() for full details.
 *
 * Return value: %CAIRO_STATUS_SUCCESS or the error that occurred
 **/
cairo_status_t
_cairo_surface_fill_rectangle (cairo_surface_t     *surface,
                         cairo_operator_t     op,
                         const cairo_color_t *color,
                         int            x,
                         int            y,
                         int            width,
                         int            height)
{
    cairo_rectangle_int_t rect;

    if (surface->status)
      return surface->status;

    assert (_cairo_surface_is_writable (surface));

    rect.x = x;
    rect.y = y;
    rect.width = width;
    rect.height = height;

    return _cairo_surface_fill_rectangles (surface, op, color, &rect, 1);
}

/**
 * _cairo_surface_fill_region:
 * @surface: a #cairo_surface_t
 * @op: the operator to apply to the region
 * @color: the source color
 * @region: the region to modify, in backend coordinates
 *
 * Applies an operator to a set of rectangles specified as a
 * #cairo_region_t using a solid color as the source.
 * See _cairo_surface_fill_rectangles() for full details.
 *
 * Return value: %CAIRO_STATUS_SUCCESS or the error that occurred
 **/
cairo_status_t
_cairo_surface_fill_region (cairo_surface_t        *surface,
                      cairo_operator_t        op,
                      const cairo_color_t    *color,
                      cairo_region_t         *region)
{
    int num_rects;
    cairo_rectangle_int_t stack_rects[CAIRO_STACK_ARRAY_LENGTH (cairo_rectangle_int_t)];
    cairo_rectangle_int_t *rects = stack_rects;
    cairo_status_t status;
    int i;

    if (surface->status)
      return surface->status;

    assert (_cairo_surface_is_writable (surface));

    num_rects = cairo_region_num_rectangles (region);
    if (num_rects == 0)
      return CAIRO_STATUS_SUCCESS;

    /* catch a common reduction of _cairo_clip_combine_with_surface() */
    if (op == CAIRO_OPERATOR_IN &&
      _cairo_color_equal (color, CAIRO_COLOR_WHITE))
    {
      return CAIRO_STATUS_SUCCESS;
    }

    if (num_rects > ARRAY_LENGTH (stack_rects)) {
      rects = _cairo_malloc_ab (num_rects,
                          sizeof (cairo_rectangle_int_t));
      if (rects == NULL) {
          return _cairo_surface_set_error (surface,
                                   _cairo_error (CAIRO_STATUS_NO_MEMORY));
      }
    }

    for (i = 0; i < num_rects; i++)
      cairo_region_get_rectangle (region, i, &rects[i]);

    status =  _cairo_surface_fill_rectangles (surface,
                                    op, color, rects, num_rects);

    if (rects != stack_rects)
      free (rects);

    return _cairo_surface_set_error (surface, status);
}

/**
 * _cairo_surface_fill_rectangles:
 * @surface: a #cairo_surface_t
 * @op: the operator to apply to the region
 * @color: the source color
 * @rects: the rectangles to modify, in backend coordinates
 * @num_rects: the number of rectangles in @rects
 *
 * Applies an operator to a set of rectangles using a solid color
 * as the source. Note that even if the operator is an unbounded operator
 * such as %CAIRO_OPERATOR_IN, only the given set of rectangles
 * is affected. This differs from _cairo_surface_composite_trapezoids()
 * where the entire destination rectangle is cleared.
 *
 * Return value: %CAIRO_STATUS_SUCCESS or the error that occurred
 **/
cairo_status_t
_cairo_surface_fill_rectangles (cairo_surface_t       *surface,
                        cairo_operator_t         op,
                        const cairo_color_t     *color,
                        cairo_rectangle_int_t   *rects,
                        int                num_rects)
{
    cairo_int_status_t status;

    if (surface->status)
      return surface->status;

    assert (_cairo_surface_is_writable (surface));

    if (num_rects == 0)
      return CAIRO_STATUS_SUCCESS;

    if (surface->backend->fill_rectangles) {
      status = surface->backend->fill_rectangles (surface,
                                        op, color,
                                        rects, num_rects);
      if (status != CAIRO_INT_STATUS_UNSUPPORTED)
          return _cairo_surface_set_error (surface, status);
    }

    return _cairo_surface_set_error (surface,
          _cairo_surface_fallback_fill_rectangles (surface,
                                         op, color,
                                         rects, num_rects));
}

static cairo_status_t
_pattern_has_error (const cairo_pattern_t *pattern)
{
    const cairo_surface_pattern_t *spattern;

    if (unlikely (pattern->status))
      return pattern->status;

    if (pattern->type != CAIRO_PATTERN_TYPE_SURFACE)
      return CAIRO_STATUS_SUCCESS;

    spattern = (const cairo_surface_pattern_t *) pattern;
    if (unlikely (spattern->surface->status))
      return spattern->surface->status;

    if (unlikely (spattern->surface->finished))
      return _cairo_error (CAIRO_STATUS_SURFACE_FINISHED);

    return CAIRO_STATUS_SUCCESS;
}

cairo_status_t
_cairo_surface_paint (cairo_surface_t     *surface,
                  cairo_operator_t   op,
                  const cairo_pattern_t *source,
                  cairo_clip_t          *clip)
{
    cairo_status_t status;

    if (unlikely (surface->status))
      return surface->status;

    if (clip && clip->all_clipped)
      return CAIRO_STATUS_SUCCESS;

    if (op == CAIRO_OPERATOR_CLEAR && surface->is_clear)
      return CAIRO_STATUS_SUCCESS;

    if (op == CAIRO_OPERATOR_OVER &&
      _cairo_pattern_is_clear (source))
    {
      return CAIRO_STATUS_SUCCESS;
    }

    status = _pattern_has_error (source);
    if (unlikely (status))
      return status;

    _cairo_surface_begin_modification (surface);

    if (surface->backend->paint != NULL) {
      status = surface->backend->paint (surface, op, source, clip);
      if (status != CAIRO_INT_STATUS_UNSUPPORTED)
            goto FINISH;
    }

    status = _cairo_surface_fallback_paint (surface, op, source, clip);

 FINISH:
    surface->is_clear = op == CAIRO_OPERATOR_CLEAR && clip == NULL;

    return _cairo_surface_set_error (surface, status);
}

cairo_status_t
_cairo_surface_mask (cairo_surface_t            *surface,
                 cairo_operator_t          op,
                 const cairo_pattern_t    *source,
                 const cairo_pattern_t    *mask,
                 cairo_clip_t       *clip)
{
    cairo_status_t status;

    if (unlikely (surface->status))
      return surface->status;

    if (clip && clip->all_clipped)
      return CAIRO_STATUS_SUCCESS;

    if (op == CAIRO_OPERATOR_CLEAR && surface->is_clear)
      return CAIRO_STATUS_SUCCESS;

    /* If the mask is blank, this is just an expensive no-op */
    if (_cairo_pattern_is_clear (mask) &&
      _cairo_operator_bounded_by_mask (op))
    {
      return CAIRO_STATUS_SUCCESS;
    }

    if (op == CAIRO_OPERATOR_OVER &&
      _cairo_pattern_is_clear (source))
    {
      return CAIRO_STATUS_SUCCESS;
    }

    status = _pattern_has_error (source);
    if (unlikely (status))
      return status;

    status = _pattern_has_error (mask);
    if (unlikely (status))
      return status;

    _cairo_surface_begin_modification (surface);

    if (surface->backend->mask != NULL) {
      status = surface->backend->mask (surface, op, source, mask, clip);
      if (status != CAIRO_INT_STATUS_UNSUPPORTED)
            goto FINISH;
    }

    status = _cairo_surface_fallback_mask (surface, op, source, mask, clip);

 FINISH:
    surface->is_clear = FALSE;

    return _cairo_surface_set_error (surface, status);
}

cairo_status_t
_cairo_surface_fill_stroke (cairo_surface_t         *surface,
                      cairo_operator_t         fill_op,
                      const cairo_pattern_t   *fill_source,
                      cairo_fill_rule_t        fill_rule,
                      double             fill_tolerance,
                      cairo_antialias_t        fill_antialias,
                      cairo_path_fixed_t      *path,
                      cairo_operator_t         stroke_op,
                      const cairo_pattern_t   *stroke_source,
                      const cairo_stroke_style_t    *stroke_style,
                      const cairo_matrix_t          *stroke_ctm,
                      const cairo_matrix_t          *stroke_ctm_inverse,
                      double             stroke_tolerance,
                      cairo_antialias_t        stroke_antialias,
                      cairo_clip_t      *clip)
{
    cairo_status_t status;

    if (unlikely (surface->status))
      return surface->status;

    if (clip && clip->all_clipped)
      return CAIRO_STATUS_SUCCESS;

    if (surface->is_clear &&
      fill_op == CAIRO_OPERATOR_CLEAR &&
      stroke_op == CAIRO_OPERATOR_CLEAR)
    {
      return CAIRO_STATUS_SUCCESS;
    }

    status = _pattern_has_error (fill_source);
    if (unlikely (status))
      return status;

    status = _pattern_has_error (stroke_source);
    if (unlikely (status))
      return status;

    _cairo_surface_begin_modification (surface);

    if (surface->backend->fill_stroke) {
      cairo_matrix_t dev_ctm = *stroke_ctm;
      cairo_matrix_t dev_ctm_inverse = *stroke_ctm_inverse;

      status = surface->backend->fill_stroke (surface,
                                    fill_op, fill_source, fill_rule,
                                    fill_tolerance, fill_antialias,
                                    path,
                                    stroke_op, stroke_source,
                                    stroke_style,
                                    &dev_ctm, &dev_ctm_inverse,
                                    stroke_tolerance, stroke_antialias,
                                    clip);

      if (status != CAIRO_INT_STATUS_UNSUPPORTED)
          goto FINISH;
    }

    status = _cairo_surface_fill (surface, fill_op, fill_source, path,
                          fill_rule, fill_tolerance, fill_antialias,
                          clip);
    if (unlikely (status))
      goto FINISH;

    status = _cairo_surface_stroke (surface, stroke_op, stroke_source, path,
                            stroke_style, stroke_ctm, stroke_ctm_inverse,
                            stroke_tolerance, stroke_antialias,
                            clip);
    if (unlikely (status))
      goto FINISH;

  FINISH:
    surface->is_clear = FALSE;

    return _cairo_surface_set_error (surface, status);
}

cairo_status_t
_cairo_surface_stroke (cairo_surface_t          *surface,
                   cairo_operator_t        op,
                   const cairo_pattern_t  *source,
                   cairo_path_fixed_t     *path,
                   const cairo_stroke_style_t   *stroke_style,
                   const cairo_matrix_t         *ctm,
                   const cairo_matrix_t         *ctm_inverse,
                   double                  tolerance,
                   cairo_antialias_t       antialias,
                   cairo_clip_t           *clip)
{
    cairo_status_t status;

    if (unlikely (surface->status))
      return surface->status;

    if (clip && clip->all_clipped)
      return CAIRO_STATUS_SUCCESS;

    if (op == CAIRO_OPERATOR_CLEAR && surface->is_clear)
      return CAIRO_STATUS_SUCCESS;

    if (op == CAIRO_OPERATOR_OVER &&
      _cairo_pattern_is_clear (source))
    {
      return CAIRO_STATUS_SUCCESS;
    }

    status = _pattern_has_error (source);
    if (unlikely (status))
      return status;

    _cairo_surface_begin_modification (surface);

    if (surface->backend->stroke != NULL) {
      status = surface->backend->stroke (surface, op, source,
                                 path, stroke_style,
                                 ctm, ctm_inverse,
                                 tolerance, antialias,
                                 clip);

      if (status != CAIRO_INT_STATUS_UNSUPPORTED)
            goto FINISH;
    }

    status = _cairo_surface_fallback_stroke (surface, op, source,
                                             path, stroke_style,
                                             ctm, ctm_inverse,
                                             tolerance, antialias,
                                   clip);

 FINISH:
    surface->is_clear = FALSE;

    return _cairo_surface_set_error (surface, status);
}

cairo_status_t
_cairo_surface_fill (cairo_surface_t      *surface,
                 cairo_operator_t    op,
                 const cairo_pattern_t *source,
                 cairo_path_fixed_t *path,
                 cairo_fill_rule_t   fill_rule,
                 double        tolerance,
                 cairo_antialias_t   antialias,
                 cairo_clip_t *clip)
{
    cairo_status_t status;

    if (unlikely (surface->status))
      return surface->status;

    if (clip && clip->all_clipped)
      return CAIRO_STATUS_SUCCESS;

    if (op == CAIRO_OPERATOR_CLEAR && surface->is_clear)
      return CAIRO_STATUS_SUCCESS;

    if (op == CAIRO_OPERATOR_OVER &&
      _cairo_pattern_is_clear (source))
    {
      return CAIRO_STATUS_SUCCESS;
    }

    status = _pattern_has_error (source);
    if (unlikely (status))
      return status;

    _cairo_surface_begin_modification (surface);

    if (surface->backend->fill != NULL) {
      status = surface->backend->fill (surface, op, source,
                               path, fill_rule,
                               tolerance, antialias,
                               clip);

      if (status != CAIRO_INT_STATUS_UNSUPPORTED)
            goto FINISH;
    }

    status = _cairo_surface_fallback_fill (surface, op, source,
                                           path, fill_rule,
                                           tolerance, antialias,
                                 clip);

 FINISH:
    surface->is_clear = FALSE;

    return _cairo_surface_set_error (surface, status);
}

cairo_status_t
_cairo_surface_composite_trapezoids (cairo_operator_t       op,
                             const cairo_pattern_t    *pattern,
                             cairo_surface_t          *dst,
                             cairo_antialias_t        antialias,
                             int                src_x,
                             int                src_y,
                             int                dst_x,
                             int                dst_y,
                             unsigned int       width,
                             unsigned int       height,
                             cairo_trapezoid_t        *traps,
                             int                num_traps,
                             cairo_region_t           *clip_region)
{
    cairo_int_status_t status;

    if (dst->status)
      return dst->status;

    assert (_cairo_surface_is_writable (dst));

    /* These operators aren't interpreted the same way by the backends;
     * they are implemented in terms of other operators in cairo-gstate.c
     */
    assert (op != CAIRO_OPERATOR_SOURCE && op != CAIRO_OPERATOR_CLEAR);

    if (dst->backend->composite_trapezoids) {
      status = dst->backend->composite_trapezoids (op,
                                         pattern, dst,
                                         antialias,
                                         src_x, src_y,
                                                     dst_x, dst_y,
                                         width, height,
                                         traps, num_traps,
                                         clip_region);
      if (status != CAIRO_INT_STATUS_UNSUPPORTED)
          return _cairo_surface_set_error (dst, status);
    }

    return  _cairo_surface_set_error (dst,
          _cairo_surface_fallback_composite_trapezoids (op, pattern, dst,
                                            antialias,
                                            src_x, src_y,
                                            dst_x, dst_y,
                                            width, height,
                                            traps, num_traps,
                                            clip_region));
}

cairo_span_renderer_t *
_cairo_surface_create_span_renderer (cairo_operator_t        op,
                             const cairo_pattern_t    *pattern,
                             cairo_surface_t          *dst,
                             cairo_antialias_t           antialias,
                             const cairo_composite_rectangles_t *rects,
                             cairo_region_t           *clip_region)
{
    assert (dst->snapshot_of == NULL);

    if (unlikely (dst->status))
      return _cairo_span_renderer_create_in_error (dst->status);

    if (unlikely (dst->finished))
      return _cairo_span_renderer_create_in_error (CAIRO_STATUS_SURFACE_FINISHED);

    if (dst->backend->create_span_renderer) {
      return dst->backend->create_span_renderer (op,
                                       pattern, dst,
                                       antialias,
                                       rects,
                                       clip_region);
    }
    ASSERT_NOT_REACHED;
    return _cairo_span_renderer_create_in_error (CAIRO_INT_STATUS_UNSUPPORTED);
}

cairo_bool_t
_cairo_surface_check_span_renderer (cairo_operator_t         op,
                            const cairo_pattern_t     *pattern,
                            cairo_surface_t           *dst,
                            cairo_antialias_t            antialias)
{
    assert (dst->snapshot_of == NULL);
    assert (dst->status == CAIRO_STATUS_SUCCESS);
    assert (! dst->finished);

    /* XXX: Currently we have no mono span renderer */
    if (antialias == CAIRO_ANTIALIAS_NONE)
      return FALSE;

    if (dst->backend->check_span_renderer != NULL)
      return dst->backend->check_span_renderer (op, pattern, dst, antialias);

    return FALSE;
}

/**
 * cairo_surface_copy_page:
 * @surface: a #cairo_surface_t
 *
 * Emits the current page for backends that support multiple pages,
 * but doesn't clear it, so that the contents of the current page will
 * be retained for the next page.  Use cairo_surface_show_page() if you
 * want to get an empty page after the emission.
 *
 * There is a convenience function for this that takes a #cairo_t,
 * namely cairo_copy_page().
 *
 * Since: 1.6
 */
void
cairo_surface_copy_page (cairo_surface_t *surface)
{
    cairo_status_t status_ignored;

    if (surface->status)
      return;

    assert (surface->snapshot_of == NULL);

    if (surface->finished) {
      status_ignored = _cairo_surface_set_error (surface,
                                             CAIRO_STATUS_SURFACE_FINISHED);
      return;
    }

    /* It's fine if some backends don't implement copy_page */
    if (surface->backend->copy_page == NULL)
      return;

    status_ignored = _cairo_surface_set_error (surface,
                                   surface->backend->copy_page (surface));
}
slim_hidden_def (cairo_surface_copy_page);

/**
 * cairo_surface_show_page:
 * @surface: a #cairo_Surface_t
 *
 * Emits and clears the current page for backends that support multiple
 * pages.  Use cairo_surface_copy_page() if you don't want to clear the page.
 *
 * There is a convenience function for this that takes a #cairo_t,
 * namely cairo_show_page().
 *
 * Since: 1.6
 **/
void
cairo_surface_show_page (cairo_surface_t *surface)
{
    cairo_status_t status_ignored;

    if (surface->status)
      return;

    if (surface->finished) {
      status_ignored = _cairo_surface_set_error (surface,
                                             CAIRO_STATUS_SURFACE_FINISHED);
      return;
    }

    _cairo_surface_begin_modification (surface);

    /* It's fine if some backends don't implement show_page */
    if (surface->backend->show_page == NULL)
      return;

    status_ignored = _cairo_surface_set_error (surface,
                                   surface->backend->show_page (surface));
}
slim_hidden_def (cairo_surface_show_page);

/**
 * _cairo_surface_get_extents:
 * @surface: the #cairo_surface_t to fetch extents for
 *
 * This function returns a bounding box for the surface.  The surface
 * bounds are defined as a region beyond which no rendering will
 * possibly be recorded, in other words, it is the maximum extent of
 * potentially usable coordinates.
 *
 * For vector surfaces, (PDF, PS, SVG and recording-surfaces), the surface
 * might be conceived as unbounded, but we force the user to provide a
 * maximum size at the time of surface_create. So get_extents uses
 * that size.
 *
 * Note: The coordinates returned are in "backend" space rather than
 * "surface" space. That is, they are relative to the true (0,0)
 * origin rather than the device_transform origin. This might seem a
 * bit inconsistent with other #cairo_surface_t interfaces, but all
 * current callers are within the surface layer where backend space is
 * desired.
 *
 * This behavior would have to be changed is we ever exported a public
 * variant of this function.
 */
cairo_bool_t
_cairo_surface_get_extents (cairo_surface_t         *surface,
                      cairo_rectangle_int_t   *extents)
{
    cairo_bool_t bounded;

    bounded = FALSE;
    if (surface->backend->get_extents != NULL)
      bounded = surface->backend->get_extents (surface, extents);

    if (! bounded)
      _cairo_unbounded_rectangle_init (extents);

    return bounded;
}

/**
 * cairo_surface_has_show_text_glyphs:
 * @surface: a #cairo_surface_t
 *
 * Returns whether the surface supports
 * sophisticated cairo_show_text_glyphs() operations.  That is,
 * whether it actually uses the provided text and cluster data
 * to a cairo_show_text_glyphs() call.
 *
 * Note: Even if this function returns %FALSE, a
 * cairo_show_text_glyphs() operation targeted at @surface will
 * still succeed.  It just will
 * act like a cairo_show_glyphs() operation.  Users can use this
 * function to avoid computing UTF-8 text and cluster mapping if the
 * target surface does not use it.
 *
 * Return value: %TRUE if @surface supports
 *               cairo_show_text_glyphs(), %FALSE otherwise
 *
 * Since: 1.8
 **/
cairo_bool_t
cairo_surface_has_show_text_glyphs (cairo_surface_t       *surface)
{
    cairo_status_t status_ignored;

    if (surface->status)
      return FALSE;

    if (surface->finished) {
      status_ignored = _cairo_surface_set_error (surface,
                                       CAIRO_STATUS_SURFACE_FINISHED);
      return FALSE;
    }

    if (surface->backend->has_show_text_glyphs)
      return surface->backend->has_show_text_glyphs (surface);
    else
      return surface->backend->show_text_glyphs != NULL;
}
slim_hidden_def (cairo_surface_has_show_text_glyphs);

/* Note: the backends may modify the contents of the glyph array as long as
 * they do not return %CAIRO_INT_STATUS_UNSUPPORTED. This makes it possible to
 * avoid copying the array again and again, and edit it in-place.
 * Backends are in fact free to use the array as a generic buffer as they
 * see fit.
 *
 * For show_glyphs backend method, and NOT for show_text_glyphs method,
 * when they do return UNSUPPORTED, they may adjust remaining_glyphs to notify
 * that they have successfully rendered some of the glyphs (from the beginning
 * of the array), but not all.  If they don't touch remaining_glyphs, it
 * defaults to all glyphs.
 *
 * See commits 5a9642c5746fd677aed35ce620ce90b1029b1a0c and
 * 1781e6018c17909311295a9cc74b70500c6b4d0a for the rationale.
 */
cairo_status_t
_cairo_surface_show_text_glyphs (cairo_surface_t          *surface,
                         cairo_operator_t      op,
                         const cairo_pattern_t      *source,
                         const char           *utf8,
                         int                   utf8_len,
                         cairo_glyph_t              *glyphs,
                         int                   num_glyphs,
                         const cairo_text_cluster_t *clusters,
                         int                   num_clusters,
                         cairo_text_cluster_flags_t  cluster_flags,
                         cairo_scaled_font_t        *scaled_font,
                         cairo_clip_t               *clip)
{
    cairo_status_t status;
    cairo_scaled_font_t *dev_scaled_font = scaled_font;

    if (unlikely (surface->status))
      return surface->status;

    if (num_glyphs == 0 && utf8_len == 0)
      return CAIRO_STATUS_SUCCESS;

    if (clip && clip->all_clipped)
      return CAIRO_STATUS_SUCCESS;

    if (op == CAIRO_OPERATOR_CLEAR && surface->is_clear)
      return CAIRO_STATUS_SUCCESS;

    status = _pattern_has_error (source);
    if (unlikely (status))
      return status;

    _cairo_surface_begin_modification (surface);

    if (_cairo_surface_has_device_transform (surface) &&
      ! _cairo_matrix_is_integer_translation (&surface->device_transform, NULL, NULL))
    {
      cairo_font_options_t font_options;
      cairo_matrix_t dev_ctm, font_matrix;

      cairo_scaled_font_get_font_matrix (scaled_font, &font_matrix);
      cairo_scaled_font_get_ctm (scaled_font, &dev_ctm);
      cairo_matrix_multiply (&dev_ctm, &dev_ctm, &surface->device_transform);
      cairo_scaled_font_get_font_options (scaled_font, &font_options);
      dev_scaled_font = cairo_scaled_font_create (cairo_scaled_font_get_font_face (scaled_font),
                                        &font_matrix,
                                        &dev_ctm,
                                        &font_options);
    }
    status = cairo_scaled_font_status (dev_scaled_font);
    if (unlikely (status))
      return _cairo_surface_set_error (surface, status);

    status = CAIRO_INT_STATUS_UNSUPPORTED;

    /* The logic here is duplicated in _cairo_analysis_surface show_glyphs and
     * show_text_glyphs.  Keep in synch. */
    if (clusters) {
      /* A real show_text_glyphs call.  Try show_text_glyphs backend
       * method first */
      if (surface->backend->show_text_glyphs != NULL) {
          status = surface->backend->show_text_glyphs (surface, op,
                                           source,
                                           utf8, utf8_len,
                                           glyphs, num_glyphs,
                                           clusters, num_clusters, cluster_flags,
                                           dev_scaled_font,
                                           clip);
      }
      if (status == CAIRO_INT_STATUS_UNSUPPORTED &&
          surface->backend->show_glyphs)
      {
          int remaining_glyphs = num_glyphs;
          status = surface->backend->show_glyphs (surface, op,
                                        source,
                                        glyphs, num_glyphs,
                                        dev_scaled_font,
                                        clip,
                                        &remaining_glyphs);
          glyphs += num_glyphs - remaining_glyphs;
          num_glyphs = remaining_glyphs;
          if (status == CAIRO_INT_STATUS_UNSUPPORTED && remaining_glyphs == 0)
            status = CAIRO_STATUS_SUCCESS;
      }
    } else {
      /* A mere show_glyphs call.  Try show_glyphs backend method first */
      if (surface->backend->show_glyphs != NULL) {
          int remaining_glyphs = num_glyphs;
          status = surface->backend->show_glyphs (surface, op,
                                        source,
                                        glyphs, num_glyphs,
                                        dev_scaled_font,
                                        clip,
                                        &remaining_glyphs);
          glyphs += num_glyphs - remaining_glyphs;
          num_glyphs = remaining_glyphs;
          if (status == CAIRO_INT_STATUS_UNSUPPORTED && remaining_glyphs == 0)
            status = CAIRO_STATUS_SUCCESS;
      } else if (surface->backend->show_text_glyphs != NULL) {
          /* Intentionally only try show_text_glyphs method for show_glyphs
           * calls if backend does not have show_glyphs.  If backend has
           * both methods implemented, we don't fallback from show_glyphs to
           * show_text_glyphs, and hence the backend can assume in its
           * show_text_glyphs call that clusters is not NULL (which also
           * implies that UTF-8 is not NULL, unless the text is
           * zero-length).
           */
          status = surface->backend->show_text_glyphs (surface, op,
                                           source,
                                           utf8, utf8_len,
                                           glyphs, num_glyphs,
                                           clusters, num_clusters, cluster_flags,
                                           dev_scaled_font,
                                           clip);
      }
    }

    if (status == CAIRO_INT_STATUS_UNSUPPORTED) {
      status = _cairo_surface_fallback_show_glyphs (surface, op,
                                          source,
                                          glyphs, num_glyphs,
                                          dev_scaled_font,
                                          clip);
    }

    if (dev_scaled_font != scaled_font)
      cairo_scaled_font_destroy (dev_scaled_font);

    surface->is_clear = FALSE;

    return _cairo_surface_set_error (surface, status);
}

/* XXX: Previously, we had a function named _cairo_surface_show_glyphs
 * with not-so-useful semantics. We've now got a
 * _cairo_surface_show_text_glyphs with the proper semantics, and its
 * fallback still uses this old function (which still needs to be
 * cleaned up in terms of both semantics and naming). */
cairo_status_t
_cairo_surface_old_show_glyphs (cairo_scaled_font_t   *scaled_font,
                        cairo_operator_t   op,
                        const cairo_pattern_t   *pattern,
                        cairo_surface_t         *dst,
                        int                source_x,
                        int                source_y,
                        int                dest_x,
                        int                dest_y,
                        unsigned int             width,
                        unsigned int             height,
                        cairo_glyph_t           *glyphs,
                        int                num_glyphs,
                        cairo_region_t          *clip_region)
{
    cairo_status_t status;

    if (dst->status)
      return dst->status;

    assert (_cairo_surface_is_writable (dst));

    if (dst->backend->old_show_glyphs) {
      status = dst->backend->old_show_glyphs (scaled_font,
                                    op, pattern, dst,
                                    source_x, source_y,
                                                dest_x, dest_y,
                                    width, height,
                                    glyphs, num_glyphs,
                                    clip_region);
    } else
      status = CAIRO_INT_STATUS_UNSUPPORTED;

    return _cairo_surface_set_error (dst, status);
}

static cairo_status_t
_cairo_surface_composite_fixup_unbounded_internal (cairo_surface_t         *dst,
                                       cairo_rectangle_int_t   *src_rectangle,
                                       cairo_rectangle_int_t   *mask_rectangle,
                                       int                      dst_x,
                                       int                      dst_y,
                                       unsigned int             width,
                                       unsigned int             height,
                                       cairo_region_t     *clip_region)
{
    cairo_rectangle_int_t dst_rectangle;
    cairo_region_t clear_region;
    cairo_status_t status;

    /* The area that was drawn is the area in the destination rectangle but
     * not within the source or the mask.
     */
    dst_rectangle.x = dst_x;
    dst_rectangle.y = dst_y;
    dst_rectangle.width = width;
    dst_rectangle.height = height;

    _cairo_region_init_rectangle (&clear_region, &dst_rectangle);

    if (clip_region != NULL) {
      status = cairo_region_intersect (&clear_region, clip_region);
      if (unlikely (status))
          goto CLEANUP_REGIONS;
    }

    if (src_rectangle != NULL) {
        if (! _cairo_rectangle_intersect (&dst_rectangle, src_rectangle))
          goto EMPTY;
    }

    if (mask_rectangle != NULL) {
        if (! _cairo_rectangle_intersect (&dst_rectangle, mask_rectangle))
          goto EMPTY;
    }

    /* Now compute the area that is in dst but not drawn */
    status = cairo_region_subtract_rectangle (&clear_region, &dst_rectangle);
    if (unlikely (status) || cairo_region_is_empty (&clear_region))
        goto CLEANUP_REGIONS;

  EMPTY:
    status = _cairo_surface_fill_region (dst, CAIRO_OPERATOR_CLEAR,
                                         CAIRO_COLOR_TRANSPARENT,
                                         &clear_region);

  CLEANUP_REGIONS:
    _cairo_region_fini (&clear_region);

    return _cairo_surface_set_error (dst, status);
}

/**
 * _cairo_surface_composite_fixup_unbounded:
 * @dst: the destination surface
 * @src_attr: source surface attributes (from _cairo_pattern_acquire_surface())
 * @src_width: width of source surface
 * @src_height: height of source surface
 * @mask_attr: mask surface attributes or %NULL if no mask
 * @mask_width: width of mask surface
 * @mask_height: height of mask surface
 * @src_x: @src_x from _cairo_surface_composite()
 * @src_y: @src_y from _cairo_surface_composite()
 * @mask_x: @mask_x from _cairo_surface_composite()
 * @mask_y: @mask_y from _cairo_surface_composite()
 * @dst_x: @dst_x from _cairo_surface_composite()
 * @dst_y: @dst_y from _cairo_surface_composite()
 * @width: @width from _cairo_surface_composite()
 * @height: @height_x from _cairo_surface_composite()
 *
 * Eeek! Too many parameters! This is a helper function to take care of fixing
 * up for bugs in libpixman and RENDER where, when asked to composite an
 * untransformed surface with an unbounded operator (like CLEAR or SOURCE)
 * only the region inside both the source and the mask is affected.
 * This function clears the region that should have been drawn but was wasn't.
 **/
cairo_status_t
_cairo_surface_composite_fixup_unbounded (cairo_surface_t            *dst,
                                cairo_surface_attributes_t *src_attr,
                                int                         src_width,
                                int                         src_height,
                                cairo_surface_attributes_t *mask_attr,
                                int                         mask_width,
                                int                         mask_height,
                                int                   src_x,
                                int                   src_y,
                                int                   mask_x,
                                int                   mask_y,
                                int                   dst_x,
                                int                   dst_y,
                                unsigned int                width,
                                unsigned int                height,
                                cairo_region_t       *clip_region)
{
    cairo_rectangle_int_t src_tmp, mask_tmp;
    cairo_rectangle_int_t *src_rectangle = NULL;
    cairo_rectangle_int_t *mask_rectangle = NULL;

    if (unlikely (dst->status))
      return dst->status;

    assert (_cairo_surface_is_writable (dst));

    /* The RENDER/libpixman operators are clipped to the bounds of the untransformed,
     * non-repeating sources and masks. Other sources and masks can be ignored.
     */
    if (_cairo_matrix_is_integer_translation (&src_attr->matrix, NULL, NULL) &&
      src_attr->extend == CAIRO_EXTEND_NONE)
    {
      src_tmp.x = (dst_x - (src_x + src_attr->x_offset));
      src_tmp.y = (dst_y - (src_y + src_attr->y_offset));
      src_tmp.width = src_width;
      src_tmp.height = src_height;

      src_rectangle = &src_tmp;
    }

    if (mask_attr &&
      _cairo_matrix_is_integer_translation (&mask_attr->matrix, NULL, NULL) &&
      mask_attr->extend == CAIRO_EXTEND_NONE)
    {
      mask_tmp.x = (dst_x - (mask_x + mask_attr->x_offset));
      mask_tmp.y = (dst_y - (mask_y + mask_attr->y_offset));
      mask_tmp.width = mask_width;
      mask_tmp.height = mask_height;

      mask_rectangle = &mask_tmp;
    }

    return _cairo_surface_composite_fixup_unbounded_internal (dst, src_rectangle, mask_rectangle,
                                                dst_x, dst_y, width, height,
                                                clip_region);
}

/**
 * _cairo_surface_composite_shape_fixup_unbounded:
 * @dst: the destination surface
 * @src_attr: source surface attributes (from _cairo_pattern_acquire_surface())
 * @src_width: width of source surface
 * @src_height: height of source surface
 * @mask_width: width of mask surface
 * @mask_height: height of mask surface
 * @src_x: @src_x from _cairo_surface_composite()
 * @src_y: @src_y from _cairo_surface_composite()
 * @mask_x: @mask_x from _cairo_surface_composite()
 * @mask_y: @mask_y from _cairo_surface_composite()
 * @dst_x: @dst_x from _cairo_surface_composite()
 * @dst_y: @dst_y from _cairo_surface_composite()
 * @width: @width from _cairo_surface_composite()
 * @height: @height_x from _cairo_surface_composite()
 *
 * Like _cairo_surface_composite_fixup_unbounded(), but instead of
 * handling the case where we have a source pattern and a mask
 * pattern, handle the case where we are compositing a source pattern
 * using a mask we create ourselves, as in
 * _cairo_surface_composite_glyphs() or _cairo_surface_composite_trapezoids()
 **/
cairo_status_t
_cairo_surface_composite_shape_fixup_unbounded (cairo_surface_t            *dst,
                                    cairo_surface_attributes_t *src_attr,
                                    int                         src_width,
                                    int                         src_height,
                                    int                         mask_width,
                                    int                         mask_height,
                                    int                   src_x,
                                    int                   src_y,
                                    int                   mask_x,
                                    int                   mask_y,
                                    int                   dst_x,
                                    int                   dst_y,
                                    unsigned int                width,
                                    unsigned int                height,
                                    cairo_region_t        *clip_region)
{
    cairo_rectangle_int_t src_tmp, *src= NULL;
    cairo_rectangle_int_t mask;

    if (dst->status)
      return dst->status;

    assert (_cairo_surface_is_writable (dst));

    /* The RENDER/libpixman operators are clipped to the bounds of the untransformed,
     * non-repeating sources and masks. Other sources and masks can be ignored.
     */
    if (_cairo_matrix_is_integer_translation (&src_attr->matrix, NULL, NULL) &&
      src_attr->extend == CAIRO_EXTEND_NONE)
    {
      src_tmp.x = (dst_x - (src_x + src_attr->x_offset));
      src_tmp.y = (dst_y - (src_y + src_attr->y_offset));
      src_tmp.width  = src_width;
      src_tmp.height = src_height;

      src = &src_tmp;
    }

    mask.x = dst_x - mask_x;
    mask.y = dst_y - mask_y;
    mask.width  = mask_width;
    mask.height = mask_height;

    return _cairo_surface_composite_fixup_unbounded_internal (dst, src, &mask,
                                                dst_x, dst_y, width, height,
                                                clip_region);
}

/**
 * _cairo_surface_set_resolution
 * @surface: the surface
 * @x_res: x resolution, in dpi
 * @y_res: y resolution, in dpi
 *
 * Set the actual surface resolution of @surface to the given x and y DPI.
 * Mainly used for correctly computing the scale factor when fallback
 * rendering needs to take place in the paginated surface.
 */
void
_cairo_surface_set_resolution (cairo_surface_t *surface,
                         double x_res,
                         double y_res)
{
    if (surface->status)
      return;

    surface->x_resolution = x_res;
    surface->y_resolution = y_res;
}

/* Generic methods for determining operation extents. */

static void
_rectangle_intersect_clip (cairo_rectangle_int_t *extents, cairo_clip_t *clip)
{
    const cairo_rectangle_int_t *clip_extents;
    cairo_bool_t is_empty;

    clip_extents = NULL;
    if (clip != NULL)
      clip_extents = _cairo_clip_get_extents (clip);

    if (clip_extents != NULL)
      is_empty = _cairo_rectangle_intersect (extents, clip_extents);
}

static void
_cairo_surface_operation_extents (cairo_surface_t *surface,
                          cairo_operator_t op,
                          const cairo_pattern_t *source,
                          cairo_clip_t *clip,
                          cairo_rectangle_int_t *extents)
{
    cairo_bool_t is_empty;

    is_empty = _cairo_surface_get_extents (surface, extents);

    if (_cairo_operator_bounded_by_source (op)) {
      cairo_rectangle_int_t source_extents;

      _cairo_pattern_get_extents (source, &source_extents);
      is_empty = _cairo_rectangle_intersect (extents, &source_extents);
    }

    _rectangle_intersect_clip (extents, clip);
}

cairo_status_t
_cairo_surface_paint_extents (cairo_surface_t *surface,
                        cairo_operator_t        op,
                        const cairo_pattern_t   *source,
                        cairo_clip_t            *clip,
                        cairo_rectangle_int_t   *extents)
{
    _cairo_surface_operation_extents (surface, op, source, clip, extents);
    return CAIRO_STATUS_SUCCESS;
}

cairo_status_t
_cairo_surface_mask_extents (cairo_surface_t *surface,
                       cairo_operator_t          op,
                       const cairo_pattern_t    *source,
                       const cairo_pattern_t    *mask,
                       cairo_clip_t       *clip,
                       cairo_rectangle_int_t    *extents)
{
    cairo_bool_t is_empty;

    _cairo_surface_operation_extents (surface, op, source, clip, extents);

    if (_cairo_operator_bounded_by_mask (op)) {
      cairo_rectangle_int_t mask_extents;

      _cairo_pattern_get_extents (mask, &mask_extents);
      is_empty = _cairo_rectangle_intersect (extents, &mask_extents);
    }

    return CAIRO_STATUS_SUCCESS;
}

cairo_status_t
_cairo_surface_stroke_extents (cairo_surface_t *surface,
                         cairo_operator_t op,
                         const cairo_pattern_t *source,
                         cairo_path_fixed_t     *path,
                         const cairo_stroke_style_t *style,
                         const cairo_matrix_t *ctm,
                         const cairo_matrix_t *ctm_inverse,
                         double tolerance,
                         cairo_antialias_t       antialias,
                         cairo_clip_t *clip,
                         cairo_rectangle_int_t *extents)
{
    cairo_status_t status;
    cairo_bool_t is_empty;

    _cairo_surface_operation_extents (surface, op, source, clip, extents);

    if (_cairo_operator_bounded_by_mask (op)) {
      cairo_rectangle_int_t mask_extents;

      status = _cairo_path_fixed_stroke_extents (path, style,
                                       ctm, ctm_inverse,
                                       tolerance,
                                       &mask_extents);
      if (unlikely (status))
          return status;

      is_empty = _cairo_rectangle_intersect (extents, &mask_extents);
    }

    return CAIRO_STATUS_SUCCESS;
}

cairo_status_t
_cairo_surface_fill_extents (cairo_surface_t          *surface,
                       cairo_operator_t          op,
                       const cairo_pattern_t    *source,
                       cairo_path_fixed_t       *path,
                       cairo_fill_rule_t         fill_rule,
                       double              tolerance,
                       cairo_antialias_t         antialias,
                       cairo_clip_t       *clip,
                       cairo_rectangle_int_t    *extents)
{
    cairo_bool_t is_empty;

    _cairo_surface_operation_extents (surface, op, source, clip, extents);

    if (_cairo_operator_bounded_by_mask (op)) {
      cairo_rectangle_int_t mask_extents;

      _cairo_path_fixed_fill_extents (path, fill_rule, tolerance,
                              &mask_extents);
      is_empty = _cairo_rectangle_intersect (extents, &mask_extents);
    }

    return CAIRO_STATUS_SUCCESS;
}

cairo_status_t
_cairo_surface_glyphs_extents (cairo_surface_t *surface,
                         cairo_operator_t    op,
                         const cairo_pattern_t *source,
                         cairo_glyph_t      *glyphs,
                         int           num_glyphs,
                         cairo_scaled_font_t  *scaled_font,
                         cairo_clip_t         *clip,
                         cairo_rectangle_int_t *extents)
{
    cairo_status_t           status;
    cairo_bool_t             is_empty;

    _cairo_surface_operation_extents (surface, op, source, clip, extents);

    if (_cairo_operator_bounded_by_mask (op)) {
      cairo_rectangle_int_t glyph_extents;

      status = _cairo_scaled_font_glyph_device_extents (scaled_font,
                                            glyphs,
                                            num_glyphs,
                                            &glyph_extents,
                                            NULL);
      if (unlikely (status))
          return status;

      is_empty = _cairo_rectangle_intersect (extents, &glyph_extents);
    }

    return CAIRO_STATUS_SUCCESS;
}

cairo_surface_t *
_cairo_surface_create_in_error (cairo_status_t status)
{
    switch (status) {
    case CAIRO_STATUS_NO_MEMORY:
      return (cairo_surface_t *) &_cairo_surface_nil;
    case CAIRO_STATUS_SURFACE_TYPE_MISMATCH:
      return (cairo_surface_t *) &_cairo_surface_nil_surface_type_mismatch;
    case CAIRO_STATUS_INVALID_STATUS:
      return (cairo_surface_t *) &_cairo_surface_nil_invalid_status;
    case CAIRO_STATUS_INVALID_CONTENT:
      return (cairo_surface_t *) &_cairo_surface_nil_invalid_content;
    case CAIRO_STATUS_INVALID_FORMAT:
      return (cairo_surface_t *) &_cairo_surface_nil_invalid_format;
    case CAIRO_STATUS_INVALID_VISUAL:
      return (cairo_surface_t *) &_cairo_surface_nil_invalid_visual;
    case CAIRO_STATUS_READ_ERROR:
      return (cairo_surface_t *) &_cairo_surface_nil_read_error;
    case CAIRO_STATUS_WRITE_ERROR:
      return (cairo_surface_t *) &_cairo_surface_nil_write_error;
    case CAIRO_STATUS_FILE_NOT_FOUND:
      return (cairo_surface_t *) &_cairo_surface_nil_file_not_found;
    case CAIRO_STATUS_TEMP_FILE_ERROR:
      return (cairo_surface_t *) &_cairo_surface_nil_temp_file_error;
    case CAIRO_STATUS_INVALID_STRIDE:
      return (cairo_surface_t *) &_cairo_surface_nil_invalid_stride;
    case CAIRO_STATUS_INVALID_SIZE:
      return (cairo_surface_t *) &_cairo_surface_nil_invalid_size;
    case CAIRO_STATUS_DEVICE_TYPE_MISMATCH:
      return (cairo_surface_t *) &_cairo_surface_nil_device_type_mismatch;
    case CAIRO_STATUS_DEVICE_ERROR:
      return (cairo_surface_t *) &_cairo_surface_nil_device_error;
    case CAIRO_STATUS_SUCCESS:
    case CAIRO_STATUS_LAST_STATUS:
      ASSERT_NOT_REACHED;
      /* fall-through */
    case CAIRO_STATUS_INVALID_RESTORE:
    case CAIRO_STATUS_INVALID_POP_GROUP:
    case CAIRO_STATUS_NO_CURRENT_POINT:
    case CAIRO_STATUS_INVALID_MATRIX:
    case CAIRO_STATUS_NULL_POINTER:
    case CAIRO_STATUS_INVALID_STRING:
    case CAIRO_STATUS_INVALID_PATH_DATA:
    case CAIRO_STATUS_SURFACE_FINISHED:
    case CAIRO_STATUS_PATTERN_TYPE_MISMATCH:
    case CAIRO_STATUS_INVALID_DASH:
    case CAIRO_STATUS_INVALID_DSC_COMMENT:
    case CAIRO_STATUS_INVALID_INDEX:
    case CAIRO_STATUS_CLIP_NOT_REPRESENTABLE:
    case CAIRO_STATUS_FONT_TYPE_MISMATCH:
    case CAIRO_STATUS_USER_FONT_IMMUTABLE:
    case CAIRO_STATUS_USER_FONT_ERROR:
    case CAIRO_STATUS_NEGATIVE_COUNT:
    case CAIRO_STATUS_INVALID_CLUSTERS:
    case CAIRO_STATUS_INVALID_SLANT:
    case CAIRO_STATUS_INVALID_WEIGHT:
    case CAIRO_STATUS_USER_FONT_NOT_IMPLEMENTED:
    default:
      _cairo_error_throw (CAIRO_STATUS_NO_MEMORY);
      return (cairo_surface_t *) &_cairo_surface_nil;
    }
}

/*  LocalWords:  rasterized
 */

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