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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/alpha-test.c
parent530ffd0b7d3c39757b20f00716e486b5caf89aff (diff)
add pixman and libpngraylib
Diffstat (limited to 'libs/pixman-0.40.0/demos/alpha-test.c')
-rw-r--r--libs/pixman-0.40.0/demos/alpha-test.c119
1 files changed, 119 insertions, 0 deletions
diff --git a/libs/pixman-0.40.0/demos/alpha-test.c b/libs/pixman-0.40.0/demos/alpha-test.c
new file mode 100644
index 0000000..54e30fa
--- /dev/null
+++ b/libs/pixman-0.40.0/demos/alpha-test.c
@@ -0,0 +1,119 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include "pixman.h"
+#include "gtk-utils.h"
+
+int
+main (int argc, char **argv)
+{
+#define WIDTH 400
+#define HEIGHT 200
+
+ uint32_t *alpha = malloc (WIDTH * HEIGHT * 4);
+ uint32_t *dest = malloc (WIDTH * HEIGHT * 4);
+ uint32_t *src = malloc (WIDTH * HEIGHT * 4);
+ pixman_image_t *grad_img;
+ pixman_image_t *alpha_img;
+ pixman_image_t *dest_img;
+ pixman_image_t *src_img;
+ int i;
+ pixman_gradient_stop_t stops[2] =
+ {
+ { pixman_int_to_fixed (0), { 0x0000, 0x0000, 0x0000, 0x0000 } },
+ { pixman_int_to_fixed (1), { 0xffff, 0x0000, 0x1111, 0xffff } }
+ };
+ pixman_point_fixed_t p1 = { pixman_double_to_fixed (0), 0 };
+ pixman_point_fixed_t p2 = { pixman_double_to_fixed (WIDTH),
+ pixman_int_to_fixed (0) };
+#if 0
+ pixman_transform_t trans = {
+ { { pixman_double_to_fixed (2), pixman_double_to_fixed (0.5), pixman_double_to_fixed (-100), },
+ { pixman_double_to_fixed (0), pixman_double_to_fixed (3), pixman_double_to_fixed (0), },
+ { pixman_double_to_fixed (0), pixman_double_to_fixed (0.000), pixman_double_to_fixed (1.0) }
+ }
+ };
+#else
+ pixman_transform_t trans = {
+ { { pixman_fixed_1, 0, 0 },
+ { 0, pixman_fixed_1, 0 },
+ { 0, 0, pixman_fixed_1 } }
+ };
+#endif
+
+#if 0
+ pixman_point_fixed_t c_inner;
+ pixman_point_fixed_t c_outer;
+ pixman_fixed_t r_inner;
+ pixman_fixed_t r_outer;
+#endif
+
+ for (i = 0; i < WIDTH * HEIGHT; ++i)
+ alpha[i] = 0x4f00004f; /* pale blue */
+
+ alpha_img = pixman_image_create_bits (PIXMAN_a8r8g8b8,
+ WIDTH, HEIGHT,
+ alpha,
+ WIDTH * 4);
+
+ for (i = 0; i < WIDTH * HEIGHT; ++i)
+ dest[i] = 0xffffff00; /* yellow */
+
+ dest_img = pixman_image_create_bits (PIXMAN_a8r8g8b8,
+ WIDTH, HEIGHT,
+ dest,
+ WIDTH * 4);
+
+ for (i = 0; i < WIDTH * HEIGHT; ++i)
+ src[i] = 0xffff0000;
+
+ src_img = pixman_image_create_bits (PIXMAN_a8r8g8b8,
+ WIDTH, HEIGHT,
+ src,
+ WIDTH * 4);
+
+#if 0
+ c_inner.x = pixman_double_to_fixed (50.0);
+ c_inner.y = pixman_double_to_fixed (50.0);
+ c_outer.x = pixman_double_to_fixed (50.0);
+ c_outer.y = pixman_double_to_fixed (50.0);
+ r_inner = 0;
+ r_outer = pixman_double_to_fixed (50.0);
+
+ grad_img = pixman_image_create_conical_gradient (&c_inner, r_inner,
+ stops, 2);
+#endif
+#if 0
+ grad_img = pixman_image_create_conical_gradient (&c_inner, r_inner,
+ stops, 2);
+ grad_img = pixman_image_create_linear_gradient (&c_inner, &c_outer,
+ r_inner, r_outer,
+ stops, 2);
+#endif
+
+ grad_img = pixman_image_create_linear_gradient (&p1, &p2,
+ stops, 2);
+
+ pixman_image_set_transform (grad_img, &trans);
+ pixman_image_set_repeat (grad_img, PIXMAN_REPEAT_PAD);
+
+ pixman_image_composite (PIXMAN_OP_OVER, grad_img, NULL, alpha_img,
+ 0, 0, 0, 0, 0, 0, 10 * WIDTH, HEIGHT);
+
+ pixman_image_set_alpha_map (src_img, alpha_img, 10, 10);
+
+ pixman_image_composite (PIXMAN_OP_OVER, src_img, NULL, dest_img,
+ 0, 0, 0, 0, 0, 0, 10 * WIDTH, HEIGHT);
+
+ printf ("0, 0: %x\n", dest[0]);
+ printf ("10, 10: %x\n", dest[10 * 10 + 10]);
+ printf ("w, h: %x\n", dest[(HEIGHT - 1) * 100 + (WIDTH - 1)]);
+
+ show_image (dest_img);
+
+ pixman_image_unref (src_img);
+ pixman_image_unref (grad_img);
+ pixman_image_unref (alpha_img);
+ free (dest);
+
+ return 0;
+}