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/*
* Copyright © 2006 Red Hat, Inc.
*
* Permission to use, copy, modify, distribute, and sell this software
* and its documentation for any purpose is hereby granted without
* fee, provided that the above copyright notice appear in all copies
* and that both that copyright notice and this permission notice
* appear in supporting documentation, and that the name of
* Red Hat, Inc. not be used in advertising or publicity pertaining to
* distribution of the software without specific, written prior
* permission. Red Hat, Inc. makes no representations about the
* suitability of this software for any purpose. It is provided "as
* is" without express or implied warranty.
*
* RED HAT, INC. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
* SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS, IN NO EVENT SHALL RED HAT, INC. BE LIABLE FOR ANY SPECIAL,
* INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
* RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
* IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Author: Carl D. Worth <cworth@cworth.org>
*/
#include "cairo-test.h"
#include <string.h>
/* Bug history
*
* 2006-01-07 Jon Hellan <hellan@acm.org>
*
* Jon opened the following bug report:
*
* _XError from XRenderCompositeText8
* https://bugs.freedesktop.org/show_bug.cgi?id=5528
*
* 2006-03-02 Carl Worth <cworth@cworth.org>
*
* I wrote this test case to demonstrate the bug.
*
* Approach:
*
* Draw 65535 glyphs white-on-white all on top of each other.
*
* Rationale:
*
* The number 65535 comes from the original bug report.
*
* I would use cairo_show_text with a long string of 'x's say,
* but then the surface would need to be enormous to contain
* them. A smaller surface could be used, but I fear that at some
* point the off-surface glyph drawing would be optimized away
* and not exercise the bug.
*
* So, to keep the surface size under control, I use
* cairo_show_glyphs which allows me to place the glyphs all on
* top of each other. But, since cairo doesn't provide any
* character-to-glyphs mapping, I can't get a reliable glyph
* index (for character 'x' for example). So I just "guess" a
* glyph index and use white-on-white drawing to ignore the
* result. (I don't care what's drawn---I just want to ensure
* that things don't crash.)
*
* Status: I replicated bug. The largest value of NUM_GLYPHS for
* which I saw success is 21842.
*
* 2008-30-08 Chris Wilson <chris@chris-wilson.co.uk>
* This is also a valid test case for:
*
* Bug 5913 crash on overlong string
* https://bugs.freedesktop.org/show_bug.cgi?id=5913
*
* which is still causing a crash in the Xlib backend - presumably, just
* a miscalculation of the length of the available request.
*/
#define TEXT_SIZE 12
#define NUM_GLYPHS 65535
static cairo_test_status_t
get_glyph (const cairo_test_context_t *ctx,
cairo_scaled_font_t *scaled_font,
const char *utf8,
cairo_glyph_t *glyph)
{
cairo_glyph_t *text_to_glyphs;
cairo_status_t status;
int i;
text_to_glyphs = glyph;
i = 1;
status = cairo_scaled_font_text_to_glyphs (scaled_font,
0, 0,
utf8, -1,
&text_to_glyphs, &i,
NULL, NULL,
0);
if (status != CAIRO_STATUS_SUCCESS)
return cairo_test_status_from_status (ctx, status);
if (text_to_glyphs != glyph) {
*glyph = text_to_glyphs[0];
cairo_glyph_free (text_to_glyphs);
}
return CAIRO_TEST_SUCCESS;
}
static cairo_test_status_t
draw (cairo_t *cr, int width, int height)
{
const cairo_test_context_t *ctx = cairo_test_get_context (cr);
cairo_glyph_t *glyphs = xmalloc (NUM_GLYPHS * sizeof (cairo_glyph_t));
cairo_scaled_font_t *scaled_font;
const char *characters[] = { /* try to exercise different widths of index */
"m", /* Latin letter m, index=0x50 */
"μ", /* Greek letter mu, index=0x349 */
NULL,
}, **utf8;
int i, j;
cairo_status_t status;
/* Paint white background. */
cairo_set_source_rgb (cr, 1, 1, 1);
cairo_paint (cr);
cairo_select_font_face (cr, CAIRO_TEST_FONT_FAMILY " Sans",
CAIRO_FONT_SLANT_NORMAL,
CAIRO_FONT_WEIGHT_NORMAL);
cairo_set_font_size (cr, TEXT_SIZE);
scaled_font = cairo_get_scaled_font (cr);
for (utf8 = characters; *utf8 != NULL; utf8++) {
status = get_glyph (ctx, scaled_font, *utf8, &glyphs[0]);
if (status)
goto BAIL;
if (glyphs[0].index) {
glyphs[0].x = 1.0;
glyphs[0].y = height - 1;
for (i=1; i < NUM_GLYPHS; i++)
glyphs[i] = glyphs[0];
cairo_show_glyphs (cr, glyphs, NUM_GLYPHS);
}
}
/* we can pack ~21k 1-byte glyphs into a single XRenderCompositeGlyphs8 */
status = get_glyph (ctx, scaled_font, "m", &glyphs[0]);
if (status)
goto BAIL;
for (i=1; i < 21500; i++)
glyphs[i] = glyphs[0];
/* so check expanding the current 1-byte request for 2-byte glyphs */
status = get_glyph (ctx, scaled_font, "μ", &glyphs[i]);
if (status)
goto BAIL;
for (j=i+1; j < NUM_GLYPHS; j++)
glyphs[j] = glyphs[i];
cairo_show_glyphs (cr, glyphs, NUM_GLYPHS);
BAIL:
free(glyphs);
return status;
}
CAIRO_TEST (show_glyphs_many,
"Test that cairo_show_glyphs works when handed 'many' glyphs",
"text, stress", /* keywords */
NULL, /* requirements */
9, 11,
NULL, draw)