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d3c4349730
The issue being that as the on-stack data is being referenced via a zero-copy snapshot outside of the functions scope as the surface is only finished and the source written long after the draw() returns. The correct procedure is that the user must call cairo_surface_finish() prior to any surface becoming inaccessible. In this case, this triggers the snapshot to preserve a copy of the data whilst it is still valid.
60 lines
2 KiB
C
60 lines
2 KiB
C
/*
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* Copyright © 2007 Red Hat, Inc.
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* Author: Carl D. Worth <cworth@cworth.org>
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*/
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#include "cairo-test.h"
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#define WIDTH 2
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#define HEIGHT 2
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static cairo_test_status_t
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draw (cairo_t *cr, int width, int height)
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{
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cairo_surface_t *surface;
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/* Four green pixels with different "alpha" values, (but which
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* should be entirely ignored). */
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uint32_t colors[4] = {
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0xff00ff00, 0x8800ff00,
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0x4400ff00, 0x0000ff00
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};
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surface = cairo_image_surface_create_for_data ((unsigned char *) colors,
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CAIRO_FORMAT_RGB24, 2, 2, 8);
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cairo_set_source_surface (cr, surface, 0, 0);
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cairo_paint (cr);
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cairo_surface_finish (surface); /* colors will go out of scope */
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cairo_surface_destroy (surface);
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return CAIRO_TEST_SUCCESS;
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}
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CAIRO_TEST (rgb24_ignore_alpha,
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"Test that when using an RGB24 image as a source, there is no alpha channel",
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"image, alpha", /* keywords */
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NULL, /* requirements */
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WIDTH, HEIGHT,
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NULL, draw)
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