mirror of
https://gitlab.freedesktop.org/cairo/cairo.git
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4a9b274eeb
A surface will have the chance to use span rendering at cairo_fill() time by creating a renderer for a specific combination of pattern/dst/op before the path is scan converted. The protocol is to first call check_span_renderer() to see if the surface wants to render with spans and then later call create_span_renderer() to create the renderer for real once the extents of the path are known. No backends have an implementation yet.
236 lines
7.4 KiB
C
236 lines
7.4 KiB
C
/* cairo - a vector graphics library with display and print output
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*
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* Copyright © 2005 Red Hat, Inc
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*
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* This library is free software; you can redistribute it and/or
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* modify it either under the terms of the GNU Lesser General Public
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* License version 2.1 as published by the Free Software Foundation
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* (the "LGPL") or, at your option, under the terms of the Mozilla
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* Public License Version 1.1 (the "MPL"). If you do not alter this
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* notice, a recipient may use your version of this file under either
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* the MPL or the LGPL.
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*
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* You should have received a copy of the LGPL along with this library
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* in the file COPYING-LGPL-2.1; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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* You should have received a copy of the MPL along with this library
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* in the file COPYING-MPL-1.1
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*
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* The contents of this file are subject to the Mozilla Public License
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* Version 1.1 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
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* OF ANY KIND, either express or implied. See the LGPL or the MPL for
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* the specific language governing rights and limitations.
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*
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* The Original Code is the cairo graphics library.
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*
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* The Initial Developer of the Original Code is Red Hat, Inc.
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*
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* Contributor(s):
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* Carl Worth <cworth@cworth.org>
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*/
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/* This isn't a "real" surface, but just something to be used by the
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* test suite to test a mythical backend that uses nothing but
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* fallbacks.
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*
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* The defining feature of this backend is that it has as many %NULL
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* backend function entries as possible. The ones that aren't %NULL are
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* simply those that must be implemented to have working fallbacks.
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* (Except for create_similar---fallbacks would work fine without
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* that---I implemented it here in order to create as many surfaces as
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* possible of type test_fallback_surface_t during the test suite
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* run).
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*
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* It's possible that this code might serve as a good starting point
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* for someone working on bringing up a new backend, starting with the
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* minimal all-fallbacks approach and working up gradually from
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* there.
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*/
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#include "cairoint.h"
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#include "test-fallback-surface.h"
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typedef struct _test_fallback_surface {
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cairo_surface_t base;
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/* This is a cairo_image_surface to hold the actual contents. */
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cairo_surface_t *backing;
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} test_fallback_surface_t;
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static const cairo_surface_backend_t test_fallback_surface_backend;
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slim_hidden_proto (_cairo_test_fallback_surface_create);
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cairo_surface_t *
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_cairo_test_fallback_surface_create (cairo_content_t content,
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int width,
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int height)
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{
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test_fallback_surface_t *surface;
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cairo_surface_t *backing;
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backing = _cairo_image_surface_create_with_content (content, width, height);
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if (cairo_surface_status (backing))
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return backing;
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surface = malloc (sizeof (test_fallback_surface_t));
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if (unlikely (surface == NULL)) {
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cairo_surface_destroy (backing);
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return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_NO_MEMORY));
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}
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_cairo_surface_init (&surface->base, &test_fallback_surface_backend,
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content);
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surface->backing = backing;
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return &surface->base;
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}
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slim_hidden_def (_cairo_test_fallback_surface_create);
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static cairo_surface_t *
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_test_fallback_surface_create_similar (void *abstract_surface,
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cairo_content_t content,
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int width,
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int height)
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{
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assert (CAIRO_CONTENT_VALID (content));
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return _cairo_test_fallback_surface_create (content,
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width, height);
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}
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static cairo_status_t
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_test_fallback_surface_finish (void *abstract_surface)
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{
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test_fallback_surface_t *surface = abstract_surface;
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cairo_surface_destroy (surface->backing);
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return CAIRO_STATUS_SUCCESS;
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}
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static cairo_status_t
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_test_fallback_surface_acquire_source_image (void *abstract_surface,
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cairo_image_surface_t **image_out,
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void **image_extra)
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{
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test_fallback_surface_t *surface = abstract_surface;
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return _cairo_surface_acquire_source_image (surface->backing,
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image_out, image_extra);
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}
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static void
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_test_fallback_surface_release_source_image (void *abstract_surface,
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cairo_image_surface_t *image,
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void *image_extra)
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{
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test_fallback_surface_t *surface = abstract_surface;
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_cairo_surface_release_source_image (surface->backing,
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image, image_extra);
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}
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static cairo_status_t
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_test_fallback_surface_acquire_dest_image (void *abstract_surface,
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cairo_rectangle_int_t *interest_rect,
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cairo_image_surface_t **image_out,
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cairo_rectangle_int_t *image_rect_out,
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void **image_extra)
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{
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test_fallback_surface_t *surface = abstract_surface;
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return _cairo_surface_acquire_dest_image (surface->backing,
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interest_rect,
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image_out,
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image_rect_out,
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image_extra);
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}
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static void
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_test_fallback_surface_release_dest_image (void *abstract_surface,
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cairo_rectangle_int_t *interest_rect,
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cairo_image_surface_t *image,
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cairo_rectangle_int_t *image_rect,
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void *image_extra)
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{
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test_fallback_surface_t *surface = abstract_surface;
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_cairo_surface_release_dest_image (surface->backing,
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interest_rect,
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image,
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image_rect,
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image_extra);
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}
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static cairo_status_t
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_test_fallback_surface_clone_similar (void *abstract_surface,
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cairo_surface_t *src,
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int src_x,
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int src_y,
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int width,
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int height,
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int *clone_offset_x,
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int *clone_offset_y,
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cairo_surface_t **clone_out)
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{
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test_fallback_surface_t *surface = abstract_surface;
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if (src->backend == surface->base.backend) {
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*clone_offset_x = 0;
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*clone_offset_y = 0;
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*clone_out = cairo_surface_reference (src);
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return CAIRO_STATUS_SUCCESS;
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}
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return CAIRO_INT_STATUS_UNSUPPORTED;
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}
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static cairo_int_status_t
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_test_fallback_surface_get_extents (void *abstract_surface,
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cairo_rectangle_int_t *rectangle)
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{
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test_fallback_surface_t *surface = abstract_surface;
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return _cairo_surface_get_extents (surface->backing, rectangle);
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}
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static const cairo_surface_backend_t test_fallback_surface_backend = {
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CAIRO_INTERNAL_SURFACE_TYPE_TEST_FALLBACK,
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_test_fallback_surface_create_similar,
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_test_fallback_surface_finish,
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_test_fallback_surface_acquire_source_image,
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_test_fallback_surface_release_source_image,
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_test_fallback_surface_acquire_dest_image,
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_test_fallback_surface_release_dest_image,
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_test_fallback_surface_clone_similar,
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NULL, /* composite */
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NULL, /* fill_rectangles */
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NULL, /* composite_trapezoids */
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NULL, /* create_span_renderer */
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NULL, /* check_span_renderer */
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NULL, /* copy_page */
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NULL, /* show_page */
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NULL, /* set_clip_region */
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NULL, /* intersect_clip_path */
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_test_fallback_surface_get_extents,
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NULL, /* old_show_glyphs */
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NULL, /* get_font_options */
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NULL, /* flush */
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NULL, /* mark_dirty_rectangle */
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NULL, /* scaled_font_fini */
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NULL, /* scaled_glyph_fini */
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NULL, /* paint */
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NULL, /* mask */
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NULL, /* stroke */
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NULL, /* fill */
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NULL, /* show_glyphs */
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NULL /* snapshot */
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};
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