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Sascha Steinbiss reported an issue with glyph culling, http://lists.cairographics.org/archives/cairo/2008-December/015976.html, whereby we failed to update the text clusters upon culling the glyphs in the gstate and proceeded to read beyond the end of the glyph array in the PDF backend. This test case setups a similar condition as reported, by trying to write a wide string into a small box.
62 lines
2.3 KiB
C
62 lines
2.3 KiB
C
/*
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* Copyright 2008 Chris Wilson
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*
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* Permission to use, copy, modify, distribute, and sell this software
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* and its documentation for any purpose is hereby granted without
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* fee, provided that the above copyright notice appear in all copies
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* and that both that copyright notice and this permission notice
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* appear in supporting documentation, and that the name of
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* Chris Wilson not be used in advertising or publicity pertaining to
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* distribution of the software without specific, written prior
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* permission. Chris Wilson makes no representations about the
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* 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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* CHRIS WILSON DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
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* SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS, IN NO EVENT SHALL CHRIS WILSON BE LIABLE FOR ANY SPECIAL,
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* INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
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* RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
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* IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* Author: Chris Wilson <chris@chris-wilson.co.uk>
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*/
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#include "cairo-test.h"
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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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const char *text =
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"This needs to be a very long string, wider than the surface, and yet wider."
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"Ideally it should overflow the stack buffers, but do you really want to read "
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"a message that long. No. So we compromise with around 300 glyphs that is "
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"long enough to trigger the conditions as stated in "
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"http://lists.cairographics.org/archives/cairo/2008-December/015976.html. "
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"Happy now?";
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cairo_text_extents_t extents;
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cairo_set_source_rgb (cr, 1, 1, 1);
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cairo_paint (cr);
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cairo_set_source_rgb (cr, 0, 0, 0);
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cairo_set_font_size (cr, 16);
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cairo_text_extents (cr, text, &extents);
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cairo_move_to (cr, -extents.width/2, 18);
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cairo_show_text (cr, text);
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/* XXX we should exercise cairo_show_text_glyphs() as well,
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* and CAIRO_TEXT_CLUSTER_BACKWARDS
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*/
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return CAIRO_TEST_SUCCESS;
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}
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CAIRO_TEST (culled_glyphs,
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"Tests culling of glyphs and text clusters",
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"glyphs", /* keywords */
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NULL, /* requirements */
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20, 20,
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NULL, draw)
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