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test: Tweak Benjamin's xcomposite-projection

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Include Benjamin's advice on how to make the bug more visible inline
with the code.
This commit is contained in:
Chris Wilson 2009-11-05 10:02:54 +00:00
parent a9f37953c7
commit 8a10c25c3f
1 changed files with 47 additions and 20 deletions
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67
test/xcomposite-projection.c
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@ -6,9 +6,9 @@
* 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
* Kai-Uwe Behrmann not be used in advertising or publicity pertaining to
* Benjamin Otte not be used in advertising or publicity pertaining to
* distribution of the software without specific, written prior
* permission. Kai-Uwe Behrmann makes no representations about the
* permission. Benjamin Otte makes no representations about the
* suitability of this software for any purpose. It is provided "as
* is" without express or implied warranty.
*
@ -25,33 +25,60 @@
#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_surface_t *
get_red_surface (void)
static cairo_pattern_t *
get_source (const cairo_test_context_t *ctx,
int *width, int *height)
{
cairo_surface_t *surface;
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);
cairo_destroy (cr);
cairo_surface_t *surface;
cairo_pattern_t *pattern;
return surface;
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_surface_t *image;
cairo_pattern_t *image;
int img_width, img_height;
image = get_red_surface ();
image = get_source (cairo_test_get_context (cr),
&img_width, &img_height);
/* we don't want to debug antialiasing artifacts */
cairo_set_antialias (cr, CAIRO_ANTIALIAS_NONE);
cairo_set_antialias (cr, ANTIALIAS);
/* dark grey background */
cairo_set_source_rgb (cr, 0.25, 0.25, 0.25);
@ -62,13 +89,13 @@ draw (cairo_t *cr, int width, int height)
cairo_rotate (cr, -0.05);
/* place the image on our surface */
cairo_set_source_surface (cr, image, 0, 0);
cairo_set_source (cr, image);
/* paint the image */
cairo_rectangle (cr, 0, 0, cairo_image_surface_get_width (image), cairo_image_surface_get_height (image));
cairo_rectangle (cr, 0, 0, img_width, img_height);
cairo_fill (cr);
cairo_surface_destroy (image);
cairo_pattern_destroy (image);
return CAIRO_TEST_SUCCESS;
}