1 files changed, 117 insertions, 0 deletions
diff --git a/pixman/demos/alpha-test.c b/pixman/demos/alpha-test.c
new file mode 100644
index 000000000..92c208142
--- /dev/null
+++ b/pixman/demos/alpha-test.c
@@ -0,0 +1,117 @@
+#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
+
+    pixman_point_fixed_t c_inner;
+    pixman_point_fixed_t c_outer;
+    pixman_fixed_t r_inner;
+    pixman_fixed_t r_outer;
+    
+    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);
+    
+    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);
+    
+#if 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;
+}