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testdisplay: paint color gradients

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Helps identify dithering problems.
This commit is contained in:
Jesse Barnes 2011-04-18 16:48:27 -07:00
parent a67091b220
commit 0d3043f5f3
1 changed files with 42 additions and 0 deletions
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42
tests/testdisplay.c
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@ -371,6 +371,45 @@ enum corner {
bottomright,
};
static void
paint_color_gradient(cairo_t *cr, int x, int y, int width, int height,
int r, int g, int b)
{
cairo_pattern_t *pat;
pat = cairo_pattern_create_linear(x, y, x + width, y + height);
cairo_pattern_add_color_stop_rgba(pat, 1, 0, 0, 0, 1);
cairo_pattern_add_color_stop_rgba(pat, 0, r, g, b, 1);
cairo_rectangle(cr, x, y, width, height);
cairo_set_source(cr, pat);
cairo_fill(cr);
cairo_pattern_destroy(pat);
}
static void
paint_test_patterns(cairo_t *cr, int width, int height, int stride)
{
double gr_height, gr_width;
int x, y;
y = height * 0.10;
gr_width = width * 0.75;
gr_height = height * 0.08;
x = (width / 2) - (gr_width / 2);
paint_color_gradient(cr, x, y, gr_width, gr_height, 1, 0, 0);
y += gr_height;
paint_color_gradient(cr, x, y, gr_width, gr_height, 0, 1, 0);
y += gr_height;
paint_color_gradient(cr, x, y, gr_width, gr_height, 0, 0, 1);
y += gr_height;
paint_color_gradient(cr, x, y, gr_width, gr_height, 1, 1, 1);
}
static void
paint_marker(cairo_t *cr, int x, int y, char *str, enum corner text_location)
{
@ -563,6 +602,9 @@ set_mode(struct connector *c)
cr = cairo_create(surface);
paint_test_patterns(cr, width, height,
cairo_image_surface_get_stride(surface));
cairo_set_line_cap(cr, CAIRO_LINE_CAP_SQUARE);
/* Paint corner markers */