Grcov report - xcb-stress-cache.c

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/*

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 * Copyright © 2011 Uli Schlachter

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 * Permission is hereby granted, free of charge, to any person

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 * obtaining a copy of this software and associated documentation

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 * files (the "Software"), to deal in the Software without

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 * restriction, including without limitation the rights to use, copy,

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 * modify, merge, publish, distribute, sublicense, and/or sell copies

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 * of the Software, and to permit persons to whom the Software is

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 * furnished to do so, subject to the following conditions:

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 * The above copyright notice and this permission notice shall be

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 * included in all copies or substantial portions of the Software.

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 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

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 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

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 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND

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 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS

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 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN

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 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN

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 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

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 * SOFTWARE.

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 * Author: Uli Schlachter <psychon@znc.in>

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*/

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#include "cairo-test.h"

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#define WIDTH 512

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#define HEIGHT 512

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/* This is a random pick. This results in 512 (width) * 512 (height) *

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 * 2 (surfaces per run) * 4 (ARGB32) * ITERATIONS = 200 MiB of image data. */

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#define ITERATIONS 100

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/* This tries to trigger a bug in the xcb backend where a Picture is freed to

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 * early. It goes something like this:

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 * - _composite_mask calls _cairo_xcb_picture_for_pattern to get a xcb_picture_t

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 *   for the source.

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 * - _cairo_xcb_picture_for_pattern calls _cairo_xcb_surface_picture which calls

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 *   _cairo_xcb_screen_store_surface_picture which adds the picture to a cache.

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 * - _cairo_xcb_surface_picture also attached the picture as a snapshot to

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 *   the source surface using cairo_surface_finish as detach_func.

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 * - _composite_mask calls _cairo_xcb_picture_for_pattern to get a xcb_picture_t

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 *   for the mask.

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 * - The resulting picture surface is added to the cache again, but the cache is

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 *   already full, so a random cache entry is picked and removed.

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 * - The surface that was added before is picked and gets fed to

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 *   _surface_cache_entry_destroy.

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 * - This calls _cairo_surface_detach_snapshot which causes the

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 *   detach_func from above to be called, so the surface is finished and the

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 *   associated picture is FreePicture'd.

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 * - _composite_mask now uses a Picture that was already freed.

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 * So this depends on the screen's surface cache to be full which is why we do

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 * all this looping.

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*/

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static cairo_surface_t *

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create_image (void)

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    cairo_surface_t *surface;

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    cairo_t *cr;

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    surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, WIDTH, HEIGHT);

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    /* Paint something random to the image */

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    cr = cairo_create (surface);

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    cairo_paint (cr);

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    cairo_set_source_rgb (cr, 0, 1, 1);

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    cairo_rectangle (cr, 0, 0, WIDTH/2.0, HEIGHT/2.0);

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    cairo_fill (cr);

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    cairo_set_source_rgb (cr, 1, 0, 1);

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    cairo_rectangle (cr, WIDTH/2.0, HEIGHT/2.0, WIDTH/2.0, HEIGHT/2.0);

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    cairo_fill (cr);

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    cairo_destroy (cr);

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    return surface;

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static cairo_surface_t *

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dirty_cache (cairo_t *cr)

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    cairo_surface_t *surface;

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    /* Set a source surface... */

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    surface = create_image ();

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    cairo_set_source_surface (cr, surface, 0, 0);

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    cairo_surface_destroy (surface);

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    /* ...and create a mask surface, so that we can hit the early FreePicture */

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    surface = create_image ();

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    cairo_mask_surface (cr, surface, 0, 0);

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    return surface;

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static cairo_test_status_t

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draw (cairo_t *cr, int width, int height)

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    int i;

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    cairo_surface_t *array[ITERATIONS];

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    /* We have to keep the associated cairo_surface_t alive so that they aren't

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     * removed from the cache */

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    for (i = 0; i < ITERATIONS; i++)

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	array[i] = dirty_cache (cr);

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    for (i = 0; i < ITERATIONS; i++)

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	cairo_surface_destroy (array[i]);

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    return CAIRO_TEST_SUCCESS;

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CAIRO_TEST (xcb_stress_cache,

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	    "Stress test for a image surface cache in cairo-xcb",

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	    "xcb, stress", /* keywords */

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	    NULL, /* requirements */

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	    2, 2,

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	    NULL, draw)