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-rw-r--r--pixman/demos/checkerboard.c71
1 files changed, 71 insertions, 0 deletions
diff --git a/pixman/demos/checkerboard.c b/pixman/demos/checkerboard.c
new file mode 100644
index 000000000..449fedb37
--- /dev/null
+++ b/pixman/demos/checkerboard.c
@@ -0,0 +1,71 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include "pixman.h"
+#include "gtk-utils.h"
+
+int
+main (int argc, char **argv)
+{
+#define WIDTH 400
+#define HEIGHT 400
+#define TILE_SIZE 25
+
+ pixman_image_t *checkerboard;
+ pixman_image_t *destination;
+#define D2F(d) (pixman_double_to_fixed(d))
+ pixman_transform_t trans = { {
+ { D2F (-1.96830), D2F (-1.82250), D2F (512.12250)},
+ { D2F (0.00000), D2F (-7.29000), D2F (1458.00000)},
+ { D2F (0.00000), D2F (-0.00911), D2F (0.59231)},
+ }};
+ int i, j;
+
+ checkerboard = pixman_image_create_bits (PIXMAN_a8r8g8b8,
+ WIDTH, HEIGHT,
+ NULL, 0);
+
+ destination = pixman_image_create_bits (PIXMAN_a8r8g8b8,
+ WIDTH, HEIGHT,
+ NULL, 0);
+
+ for (i = 0; i < HEIGHT / TILE_SIZE; ++i)
+ {
+ for (j = 0; j < WIDTH / TILE_SIZE; ++j)
+ {
+ double u = (double)(j + 1) / (WIDTH / TILE_SIZE);
+ double v = (double)(i + 1) / (HEIGHT / TILE_SIZE);
+ pixman_color_t black = { 0, 0, 0, 0xffff };
+ pixman_color_t white = {
+ v * 0xffff,
+ u * 0xffff,
+ (1 - (double)u) * 0xffff,
+ 0xffff };
+ pixman_color_t *c;
+ pixman_image_t *fill;
+
+ if ((j & 1) != (i & 1))
+ c = &black;
+ else
+ c = &white;
+
+ fill = pixman_image_create_solid_fill (c);
+
+ pixman_image_composite (PIXMAN_OP_SRC, fill, NULL, checkerboard,
+ 0, 0, 0, 0, j * TILE_SIZE, i * TILE_SIZE,
+ TILE_SIZE, TILE_SIZE);
+ }
+ }
+
+ pixman_image_set_transform (checkerboard, &trans);
+ pixman_image_set_filter (checkerboard, PIXMAN_FILTER_BEST, NULL, 0);
+ pixman_image_set_repeat (checkerboard, PIXMAN_REPEAT_NONE);
+
+ pixman_image_composite (PIXMAN_OP_SRC,
+ checkerboard, NULL, destination,
+ 0, 0, 0, 0, 0, 0,
+ WIDTH, HEIGHT);
+
+ show_image (destination);
+
+ return 0;
+}