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67cfb20bd0
Since 1cc750ed92a936d84b47cac696aaffd226e1c02e pixman won't perform the compositing if it can't prove that this the computations it has to perform will fit within the size of the variables it uses. It looks like in this case it cannot prove that no overflow will happen unless surface_width <= 30582. Instead of this size (discovered by bisection), a safer looking 30000 was chosen. It should still trigger the problems the original test was looking for, because backends which support 30000xheight surfaces will likely support 32767xheight as well.
78 lines
2.7 KiB
C
78 lines
2.7 KiB
C
/*
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* Copyright © 2009 Joonas Pihlaja
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*
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that copyright
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* notice and this permission notice appear in supporting documentation, and
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* that the name of the copyright holders not be used in advertising or
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* publicity pertaining to distribution of the software without specific,
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* written prior permission. The copyright holders make no representations
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* about the suitability of this software for any purpose. It is provided "as
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* is" without express or implied warranty.
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*
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* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
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* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
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* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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* OF THIS SOFTWARE.
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*/
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#include "cairo-test.h"
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/* This test attempts to trigger failures in those clone_similar
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* backend methods that have size restrictions. */
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static cairo_surface_t *
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create_large_source (int width, int height)
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{
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cairo_surface_t *surface;
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cairo_t *cr;
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surface = cairo_image_surface_create (CAIRO_FORMAT_RGB24, width, height);
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cr = cairo_create (surface);
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cairo_surface_destroy (surface);
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cairo_set_source_rgb (cr, 1,0,0); /* red */
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cairo_paint (cr);
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surface = cairo_surface_reference (cairo_get_target (cr));
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cairo_destroy (cr);
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return surface;
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}
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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 *source;
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/* Since 1cc750ed92a936d84b47cac696aaffd226e1c02e pixman will not
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* paint on the source surface if source_width > 30582. */
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double source_width = 30000.0;
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cairo_set_source_rgb (cr, 1,1,1);
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cairo_paint (cr);
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/* Create an excessively wide source image, all red. */
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source = create_large_source (source_width, height);
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/* Set a transform so that the source is scaled down to fit in the
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* destination horizontally and then paint the entire source to
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* the context. */
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cairo_scale (cr, width/source_width, 1.0);
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cairo_set_source_surface (cr, source, 0, 0);
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cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
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cairo_paint (cr);
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cairo_surface_destroy (source);
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return CAIRO_TEST_SUCCESS;
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}
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CAIRO_TEST (large_source_roi,
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"Uses a all of a large source image.",
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"stress, source", /* keywords */
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NULL, /* requirements */
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7, 7,
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NULL, draw)
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