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Diffstat (limited to 'libs/cairo-1.16.0/test/glyph-cache-pressure.c')
| -rw-r--r-- | libs/cairo-1.16.0/test/glyph-cache-pressure.c | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/libs/cairo-1.16.0/test/glyph-cache-pressure.c b/libs/cairo-1.16.0/test/glyph-cache-pressure.c new file mode 100644 index 0000000..eb4f7c5 --- /dev/null +++ b/libs/cairo-1.16.0/test/glyph-cache-pressure.c @@ -0,0 +1,81 @@ +/* + * Copyright © 2005 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 "cairo-boilerplate-scaled-font.h" + +#define TEXT_SIZE 12 + +/* Bug history + * + * 2006-06-22 Carl Worth <cworth@cworth.org> + * + * This is a test case to demonstrate the following bug in the xlib backend: + * + * Some characters aren't displayed when using xlib (cache usage missing freeze/thaw) + * https://bugs.freedesktop.org/show_bug.cgi?id=6955 + * + * We replicate this bug by using the cairo_scaled_font_set_max_glyphs_per_font + * function to artificially induce cache pressure. (This function was added + * for this very purpose.) + * + * 2006-06-22 Carl Worth <cworth@cworth.org> + * + * Bug was simple enough to solve by just adding a freeze/thaw pair + * around the scaled_font's glyph cache in + * _cairo_xlib_surface_show_glyphs, (I went ahead and added + * _cairo_sacled_font_freeze/thaw_cache functions for this). + */ + +static cairo_test_status_t +draw (cairo_t *cr, int width, int height) +{ + /* We draw in the default black, so paint white first. */ + cairo_save (cr); + cairo_set_source_rgb (cr, 1.0, 1.0, 1.0); /* white */ + cairo_paint (cr); + cairo_restore (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); + + cairo_set_source_rgb (cr, 0, 0, 0); /* black */ + + cairo_boilerplate_scaled_font_set_max_glyphs_cached (cairo_get_scaled_font (cr), 1); + + cairo_move_to (cr, 1, TEXT_SIZE); + cairo_show_text (cr, "the five boxing wizards jump quickly"); + + return CAIRO_TEST_SUCCESS; +} + +CAIRO_TEST (glyph_cache_pressure, + "Ensure that all backends behave well under artificial glyph cache pressure", + "stress", /* keywords */ + NULL, /* requirements */ + 223, TEXT_SIZE + 4, + NULL, draw) |