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authorsanine <sanine.not@pm.me>2022-10-12 13:26:36 -0500
committersanine <sanine.not@pm.me>2022-10-12 13:26:36 -0500
commitf567ea1e2798fd3156a416e61f083ea3e6b95719 (patch)
tree53b51bda93aadf9dd13fcd77635b8c4b5c813768 /libs/pixman-0.40.0/demos/conical-test.c
parent530ffd0b7d3c39757b20f00716e486b5caf89aff (diff)
add pixman and libpngraylib
Diffstat (limited to 'libs/pixman-0.40.0/demos/conical-test.c')
-rw-r--r--libs/pixman-0.40.0/demos/conical-test.c100
1 files changed, 100 insertions, 0 deletions
diff --git a/libs/pixman-0.40.0/demos/conical-test.c b/libs/pixman-0.40.0/demos/conical-test.c
new file mode 100644
index 0000000..6b32430
--- /dev/null
+++ b/libs/pixman-0.40.0/demos/conical-test.c
@@ -0,0 +1,100 @@
+#include "../test/utils.h"
+#include "gtk-utils.h"
+
+#define SIZE 128
+#define GRADIENTS_PER_ROW 7
+#define NUM_ROWS ((NUM_GRADIENTS + GRADIENTS_PER_ROW - 1) / GRADIENTS_PER_ROW)
+#define WIDTH (SIZE * GRADIENTS_PER_ROW)
+#define HEIGHT (SIZE * NUM_ROWS)
+#define NUM_GRADIENTS 35
+
+#define double_to_color(x) \
+ (((uint32_t) ((x)*65536)) - (((uint32_t) ((x)*65536)) >> 16))
+
+#define PIXMAN_STOP(offset,r,g,b,a) \
+ { pixman_double_to_fixed (offset), \
+ { \
+ double_to_color (r), \
+ double_to_color (g), \
+ double_to_color (b), \
+ double_to_color (a) \
+ } \
+ }
+
+
+static const pixman_gradient_stop_t stops[] = {
+ PIXMAN_STOP (0.25, 1, 0, 0, 0.7),
+ PIXMAN_STOP (0.5, 1, 1, 0, 0.7),
+ PIXMAN_STOP (0.75, 0, 1, 0, 0.7),
+ PIXMAN_STOP (1.0, 0, 0, 1, 0.7)
+};
+
+#define NUM_STOPS (sizeof (stops) / sizeof (stops[0]))
+
+static pixman_image_t *
+create_conical (int index)
+{
+ pixman_point_fixed_t c;
+ double angle;
+
+ c.x = pixman_double_to_fixed (0);
+ c.y = pixman_double_to_fixed (0);
+
+ angle = (0.5 / NUM_GRADIENTS + index / (double)NUM_GRADIENTS) * 720 - 180;
+
+ return pixman_image_create_conical_gradient (
+ &c, pixman_double_to_fixed (angle), stops, NUM_STOPS);
+}
+
+int
+main (int argc, char **argv)
+{
+ pixman_transform_t transform;
+ pixman_image_t *src_img, *dest_img;
+ int i;
+
+ enable_divbyzero_exceptions ();
+
+ dest_img = pixman_image_create_bits (PIXMAN_a8r8g8b8,
+ WIDTH, HEIGHT,
+ NULL, 0);
+
+ draw_checkerboard (dest_img, 25, 0xffaaaaaa, 0xff888888);
+
+ pixman_transform_init_identity (&transform);
+
+ pixman_transform_translate (NULL, &transform,
+ pixman_double_to_fixed (0.5),
+ pixman_double_to_fixed (0.5));
+
+ pixman_transform_scale (NULL, &transform,
+ pixman_double_to_fixed (SIZE),
+ pixman_double_to_fixed (SIZE));
+ pixman_transform_translate (NULL, &transform,
+ pixman_double_to_fixed (0.5),
+ pixman_double_to_fixed (0.5));
+
+ for (i = 0; i < NUM_GRADIENTS; i++)
+ {
+ int column = i % GRADIENTS_PER_ROW;
+ int row = i / GRADIENTS_PER_ROW;
+
+ src_img = create_conical (i);
+ pixman_image_set_repeat (src_img, PIXMAN_REPEAT_NORMAL);
+
+ pixman_image_set_transform (src_img, &transform);
+
+ pixman_image_composite32 (
+ PIXMAN_OP_OVER, src_img, NULL,dest_img,
+ 0, 0, 0, 0, column * SIZE, row * SIZE,
+ SIZE, SIZE);
+
+ pixman_image_unref (src_img);
+ }
+
+ show_image (dest_img);
+
+ pixman_image_unref (dest_img);
+
+ return 0;
+}