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tests: Add more dithering tests

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Use operator add to add the same source over and over again, to make the
dithering more pronounced.
This commit is contained in:
Uli Schlachter 2023-09-23 12:15:27 +01:00 • committed by Emmanuele Bassi
parent ac26a16171
commit ac1ac72ff1
1 changed files with 34 additions and 7 deletions
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41
test/dithergradient.c
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@ -25,12 +25,8 @@
#include "cairo-test.h"
/* History:
*
* 2023: v3 of a patch to use pixman dithering with cairo
*/
static cairo_test_status_t
draw (cairo_t *cr, int width, int height)
static void
set_dither_source (cairo_t *cr, int width)
{
cairo_pattern_t *gradient = cairo_pattern_create_linear (0, 0, width, 0);
cairo_pattern_add_color_stop_rgba (gradient, 0., 25./255, 25./255, 25./255, 1.0);
@ -38,9 +34,34 @@ draw (cairo_t *cr, int width, int height)
cairo_set_source (cr, gradient);
cairo_pattern_set_dither (gradient, CAIRO_DITHER_BEST);
cairo_pattern_destroy (gradient);
}
/* History:
*
* 2023: v3 of a patch to use pixman dithering with cairo
*/
static cairo_test_status_t
draw (cairo_t *cr, int width, int height)
{
set_dither_source (cr, width);
cairo_paint (cr);
cairo_pattern_destroy (gradient);
return CAIRO_TEST_SUCCESS;
}
static cairo_test_status_t
draw2 (cairo_t *cr, int width, int height)
{
cairo_set_source_rgb (cr, 0, 0, 0);
cairo_paint (cr);
set_dither_source (cr, width);
cairo_set_operator (cr, CAIRO_OPERATOR_ADD);
for (int i = 0; i < 5; i++) {
cairo_paint (cr);
}
return CAIRO_TEST_SUCCESS;
}
@ -51,3 +72,9 @@ CAIRO_TEST (dithergradient,
NULL, /* requirements */
400, 100,
NULL, draw)
CAIRO_TEST (dithergradient2,
"Testing the creation of a dithered gradient (in argb32)",
"gradient, dither", /* keywords */
NULL, /* requirements */
400, 100,
NULL, draw2)