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/*
* 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)
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