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Show alpha in the palette as well

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This commit is contained in:
Matthias Clasen 2012-01-31 00:58:07 -05:00
parent 9161119329
commit 8d1565df94
1 changed files with 36 additions and 0 deletions
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36
gtk/gtkcolorswatch.c
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@ -88,6 +88,27 @@ swatch_finalize (GObject *object)
#define INTENSITY(r, g, b) ((r) * 0.30 + (g) * 0.59 + (b) * 0.11)
static cairo_pattern_t *
get_checkered_pattern (void)
{
/* need to respect pixman's stride being a multiple of 4 */
static unsigned char data[8] = { 0xFF, 0x00, 0x00, 0x00,
0x00, 0xFF, 0x00, 0x00 };
static cairo_surface_t *checkered = NULL;
cairo_pattern_t *pattern;
if (checkered == NULL)
checkered = cairo_image_surface_create_for_data (data,
CAIRO_FORMAT_A8,
2, 2, 4);
pattern = cairo_pattern_create_for_surface (checkered);
cairo_pattern_set_extend (pattern, CAIRO_EXTEND_REPEAT);
cairo_pattern_set_filter (pattern, CAIRO_FILTER_NEAREST);
return pattern;
}
static gboolean
swatch_draw (GtkWidget *widget,
cairo_t *cr)
@ -118,6 +139,21 @@ swatch_draw (GtkWidget *widget,
if (swatch->priv->has_color)
{
cairo_pattern_t *pattern;
cairo_matrix_t matrix;
cairo_set_source_rgb (cr, 0.33, 0.33, 0.33);
cairo_fill_preserve (cr);
cairo_set_source_rgb (cr, 0.66, 0.66, 0.66);
pattern = get_checkered_pattern ();
cairo_matrix_init_scale (&matrix, 0.125, 0.125);
cairo_pattern_set_matrix (pattern, &matrix);
cairo_clip_preserve (cr);
cairo_mask (cr, pattern);
cairo_pattern_destroy (pattern);
gdk_cairo_set_source_rgba (cr, &swatch->priv->color);
cairo_fill_preserve (cr);
}