diff options
Diffstat (limited to 'test/xcb-stress-cache.c')
| -rw-r--r-- | test/xcb-stress-cache.c | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/test/xcb-stress-cache.c b/test/xcb-stress-cache.c new file mode 100644 index 000000000..3e3d0a289 --- /dev/null +++ b/test/xcb-stress-cache.c @@ -0,0 +1,118 @@ +/* + * Copyright © 2011 Uli Schlachter + * + * Permission is hereby granted, free of charge, to any person + * obtaining a copy of this software and associated documentation + * files (the "Software"), to deal in the Software without + * restriction, including without limitation the rights to use, copy, + * modify, merge, publish, distribute, sublicense, and/or sell copies + * of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be + * included in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + * + * Author: Uli Schlachter <psychon@znc.in> + */ + +#include "cairo-test.h" + +#define WIDTH 512 +#define HEIGHT 512 + +/* This is a random pick. This results in 512 (width) * 512 (height) * + * 2 (surfaces per run) * 4 (ARGB32) * ITERATIONS = 200 MiB of image data. */ +#define ITERATIONS 100 + +/* This tries to trigger a bug in the xcb backend where a Picture is freed to + * early. It goes something like this: + * + * - _composite_mask calls _cairo_xcb_picture_for_pattern to get a xcb_picture_t + * for the source. + * - _cairo_xcb_picture_for_pattern calls _cairo_xcb_surface_picture which calls + * _cairo_xcb_screen_store_surface_picture which adds the picture to a cache. + * - _cairo_xcb_surface_picture also attached the picture as a snapshot to + * the source surface using cairo_surface_finish as detach_func. + * - _composite_mask calls _cairo_xcb_picture_for_pattern to get a xcb_picture_t + * for the mask. + * - The resulting picture surface is added to the cache again, but the cache is + * already full, so a random cache entry is picked and removed. + * - The surface that was added before is picked and gets fed to + * _surface_cache_entry_destroy. + * - This calls _cairo_surface_detach_snapshot which causes the + * detach_func from above to be called, so the surface is finished and the + * associated picture is FreePicture'd. + * - _composite_mask now uses a Picture that was already freed. + * + * So this depends on the screen's surface cache to be full which is why we do + * all this looping. + */ + +static cairo_surface_t * +create_image (void) +{ + cairo_surface_t *surface; + cairo_t *cr; + + surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, WIDTH, HEIGHT); + /* Paint something random to the image */ + cr = cairo_create (surface); + cairo_paint (cr); + cairo_set_source_rgb (cr, 0, 1, 1); + cairo_rectangle (cr, 0, 0, WIDTH/2.0, HEIGHT/2.0); + cairo_fill (cr); + cairo_set_source_rgb (cr, 1, 0, 1); + cairo_rectangle (cr, WIDTH/2.0, HEIGHT/2.0, WIDTH/2.0, HEIGHT/2.0); + cairo_fill (cr); + cairo_destroy (cr); + + return surface; +} + +static cairo_surface_t * +dirty_cache (cairo_t *cr) +{ + cairo_surface_t *surface; + + /* Set a source surface... */ + surface = create_image (); + cairo_set_source_surface (cr, surface, 0, 0); + cairo_surface_destroy (surface); + /* ...and create a mask surface, so that we can hit the early FreePicture */ + surface = create_image (); + cairo_mask_surface (cr, surface, 0, 0); + + return surface; +} + +static cairo_test_status_t +draw (cairo_t *cr, int width, int height) +{ + int i; + cairo_surface_t *array[ITERATIONS]; + + /* We have to keep the associated cairo_surface_t alive so that they aren't + * removed from the cache */ + for (i = 0; i < ITERATIONS; i++) + array[i] = dirty_cache (cr); + for (i = 0; i < ITERATIONS; i++) + cairo_surface_destroy (array[i]); + + return CAIRO_TEST_SUCCESS; +} + +CAIRO_TEST (xcb_stress_cache, + "Stress test for a image surface cache in cairo-xcb", + "xcb, stress", /* keywords */ + NULL, /* requirements */ + 2, 2, + NULL, draw) |