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Adding more traditional checkered background to testtextview.

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This commit is contained in:
Tristan Van Berkom
2011-02-14 16:47:57 +09:00
committed by Matthias Clasen
parent e217c455f8
commit 9fd1feb2a8
1 changed files with 38 additions and 10 deletions
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48
tests/testtextview.c
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@ -18,7 +18,7 @@ create_tags (GtkTextBuffer *buffer)
"scale", PANGO_SCALE_X_LARGE, NULL);
gtk_text_buffer_create_tag (buffer, "semi_blue_foreground",
"foreground", "rgba(0,0,255,0.5)", NULL);
"foreground", "rgba(0,0,255,0.7)", NULL);
gtk_text_buffer_create_tag (buffer, "semi_red_background",
"background", "rgba(255,0,0,0.5)", NULL);
@ -101,22 +101,50 @@ insert_text (GtkTextBuffer *buffer)
gtk_text_buffer_apply_tag_by_name (buffer, "word_wrap", &start, &end);
}
/* Size of checks and gray levels for alpha compositing checkerboard */
#define CHECK_SIZE 10
#define CHECK_DARK (1.0 / 3.0)
#define CHECK_LIGHT (2.0 / 3.0)
static cairo_pattern_t *
get_checkered (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 void
draw_background (GtkWidget *widget, cairo_t *cr)
{
GtkAllocation allocation;
cairo_pattern_t *pat;
gtk_widget_get_allocation (widget, &allocation);
cairo_save (cr);
pat = cairo_pattern_create_linear (0.0, 0.0, allocation.width, allocation.height);
cairo_pattern_add_color_stop_rgba (pat, 1, 0, 0, 0, 1);
cairo_pattern_add_color_stop_rgba (pat, 0, 1, 1, 1, 1);
cairo_rectangle (cr, 0, 0, allocation.width, allocation.height);
cairo_set_source (cr, pat);
cairo_fill (cr);
cairo_set_source_rgb (cr, CHECK_DARK, CHECK_DARK, CHECK_DARK);
cairo_paint (cr);
cairo_set_source_rgb (cr, CHECK_LIGHT, CHECK_LIGHT, CHECK_LIGHT);
cairo_scale (cr, CHECK_SIZE, CHECK_SIZE);
pat = get_checkered ();
cairo_mask (cr, pat);
cairo_pattern_destroy (pat);
cairo_restore (cr);