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Diffstat (limited to 'test/show-glyphs-many.c')
| -rw-r--r-- | test/show-glyphs-many.c | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/test/show-glyphs-many.c b/test/show-glyphs-many.c new file mode 100644 index 000000000..f689fe080 --- /dev/null +++ b/test/show-glyphs-many.c @@ -0,0 +1,176 @@ +/* + * 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, "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) |