/* * 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)