blob: 39686cf996968b191bd40e40a622e6b129da21ab [file] [log] [blame]
/*
* Copyright 2009 Benjamin Otte
*
* 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: Benjamin Otte <otte@gnome.org>
*/
#include "cairo-test.h"
/*
* Exercise a bug in the projection of a rotated trapezoid mask.
* I used CAIRO_ANTIALIAS_NONE and a single-color source in the test to get
* rid of aliasing issues in the output images. This makes some issues
* slightly less visible, but still fails for all of them. If you want to
* get a clearer view:
* #define ANTIALIAS CAIRO_ANTIALIAS_DEFAULT
*/
#define ANTIALIAS CAIRO_ANTIALIAS_NONE
static const char png_filename[] = "romedalen.png";
static cairo_pattern_t *
get_source (const cairo_test_context_t *ctx,
int *width, int *height)
{
cairo_surface_t *surface;
cairo_pattern_t *pattern;
if (ANTIALIAS == CAIRO_ANTIALIAS_NONE) {
cairo_t *cr;
surface = cairo_image_surface_create (CAIRO_FORMAT_RGB24, 256, 192);
cr = cairo_create (surface);
cairo_set_source_rgb (cr, 0.75, 0.25, 0.25);
cairo_paint (cr);
pattern = cairo_pattern_create_for_surface (cairo_get_target (cr));
cairo_destroy (cr);
} else {
surface = cairo_test_create_surface_from_png (ctx, png_filename);
pattern = cairo_pattern_create_for_surface (surface);
}
*width = cairo_image_surface_get_width (surface);
*height = cairo_image_surface_get_height (surface);
cairo_surface_destroy (surface);
return pattern;
}
static cairo_test_status_t
draw (cairo_t *cr, int width, int height)
{
cairo_pattern_t *image;
int img_width, img_height;
image = get_source (cairo_test_get_context (cr),
&img_width, &img_height);
/* we don't want to debug antialiasing artifacts */
cairo_set_antialias (cr, ANTIALIAS);
/* dark grey background */
cairo_set_source_rgb (cr, 0.25, 0.25, 0.25);
cairo_paint (cr);
/* magic transform */
cairo_translate (cr, 10, -40);
cairo_rotate (cr, -0.05);
/* place the image on our surface */
cairo_set_source (cr, image);
/* paint the image */
cairo_rectangle (cr, 0, 0, img_width, img_height);
cairo_fill (cr);
cairo_pattern_destroy (image);
return CAIRO_TEST_SUCCESS;
}
CAIRO_TEST (xcomposite_projection,
"Test a bug with XRenderComposite reference computation when projecting the first trapezoid onto 16.16 space",
"xlib", /* keywords */
"target=raster", /* requirements */
300, 150,
NULL, draw)