diff options
author | sanine <sanine.not@pm.me> | 2022-10-12 13:26:36 -0500 |
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committer | sanine <sanine.not@pm.me> | 2022-10-12 13:26:36 -0500 |
commit | f567ea1e2798fd3156a416e61f083ea3e6b95719 (patch) | |
tree | 53b51bda93aadf9dd13fcd77635b8c4b5c813768 /libs/pixman-0.40.0/demos/alpha-test.c | |
parent | 530ffd0b7d3c39757b20f00716e486b5caf89aff (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.c | 119 |
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; +} |