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2fa709d6af
This should help with not requiring many backend-specific reference images, and some should be removed now.
121 lines
3.8 KiB
C
121 lines
3.8 KiB
C
/*
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* Copyright © 2006 Red Hat, Inc.
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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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* Red Hat, Inc. 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. Red Hat, Inc. 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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* RED HAT, INC. 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 RED HAT, INC. 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: Carl D. Worth <cworth@cworth.org>
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*/
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#include "cairo-test.h"
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#include <string.h>
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/* Bug history
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*
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* 2006-01-07 Jon Hellan <hellan@acm.org>
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*
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* Jon opened the following bug report:
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*
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* _XError from XRenderCompositeText8
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* https://bugs.freedesktop.org/show_bug.cgi?id=5528
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*
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* 2006-03-02 Carl Worth <cworth@cworth.org>
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*
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* I wrote this test case to demonstrate the bug.
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*
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* Approach:
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*
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* Draw 65535 glyphs white-on-white all on top of each other.
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*
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* Rationale:
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*
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* The number 65535 comes from the original bug report.
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*
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* I would use cairo_show_text with a long string of 'x's say,
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* but then the surface would need to be enormous to contain
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* them. A smaller surface could be used, but I fear that at some
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* point the off-surface glyph drawing would be optimized away
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* and not exercise the bug.
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*
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* So, to keep the surface size under control, I use
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* cairo_show_glyphs which allows me to place the glyphs all on
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* top of each other. But, since cairo doesn't provide any
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* character-to-glyphs mapping, I can't get a reliable glyph
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* index (for character 'x' for example). So I just "guess" a
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* glyph index and use white-on-white drawing to ignore the
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* result. (I don't care what's drawn---I just want to ensure
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* that things don't crash.)
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*
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* Status: I replicated bug. The largest value of NUM_GLYPHS for
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* which I saw success is 21842.
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*/
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#define TEXT_SIZE 12
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#define NUM_GLYPHS 65535
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/* This is the index into the font for what glyph we'll draw. Since we
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* don't guarantee we'll get any particular font, we can't relibably
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* get any particular glyph. But we don't care what we draw anyway,
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* (see discussion of white-on-white drawing above). For what it's
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* worth, this appears to be giving me 'M' with Bitstream Vera
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* Sans Mono. */
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#define GLYPH_INDEX 48
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static cairo_test_draw_function_t draw;
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cairo_test_t test = {
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"show-glyphs-many",
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"Test that cairo_show_glyps works when handed 'many' glyphs",
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9, 11,
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draw
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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_glyph_t glyphs[NUM_GLYPHS];
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int i;
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/* Initialize our giant array of glyphs. */
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for (i=0; i < NUM_GLYPHS; i++) {
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glyphs[i].index = GLYPH_INDEX;
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glyphs[i].x = 1.0;
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glyphs[i].y = height - 1;
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}
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/* Paint white background. */
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cairo_set_source_rgb (cr, 1.0, 1.0, 1.0); /* white */
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cairo_paint (cr);
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cairo_select_font_face (cr, "Bitstream Vera Sans Mono",
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CAIRO_FONT_SLANT_NORMAL,
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CAIRO_FONT_WEIGHT_NORMAL);
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cairo_set_font_size (cr, TEXT_SIZE);
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cairo_show_glyphs (cr, glyphs, NUM_GLYPHS);
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return CAIRO_TEST_SUCCESS;
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}
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int
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main (void)
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{
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return cairo_test (&test);
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}
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