Add qemu 2.4.0

[kvmfornfv.git] / qemu / pixman / demos / srgb-test.c

diff --git a/qemu/pixman/demos/srgb-test.c b/qemu/pixman/demos/srgb-test.c
new file mode 100644 (file)
index 0000000..681d521
--- /dev/null
+++ b/qemu/pixman/demos/srgb-test.c
@@ -0,0 +1,87 @@
+#include <math.h>
+
+#include "pixman.h"
+#include "gtk-utils.h"
+
+static uint32_t
+linear_argb_to_premult_argb (float a,
+                            float r,
+                            float g,
+                            float b)
+{
+    r *= a;
+    g *= a;
+    b *= a;
+    return (uint32_t) (a * 255.0f + 0.5f) << 24
+        | (uint32_t) (r * 255.0f + 0.5f) << 16
+        | (uint32_t) (g * 255.0f + 0.5f) <<  8
+        | (uint32_t) (b * 255.0f + 0.5f) <<  0;
+}
+
+static float
+lin2srgb (float linear)
+{
+    if (linear < 0.0031308f)
+       return linear * 12.92f;
+    else
+       return 1.055f * powf (linear, 1.0f/2.4f) - 0.055f;
+}
+
+static uint32_t
+linear_argb_to_premult_srgb_argb (float a,
+                                 float r,
+                                 float g,
+                                 float b)
+{
+    r = lin2srgb (r * a);
+    g = lin2srgb (g * a);
+    b = lin2srgb (b * a);
+    return (uint32_t) (a * 255.0f + 0.5f) << 24
+        | (uint32_t) (r * 255.0f + 0.5f) << 16
+        | (uint32_t) (g * 255.0f + 0.5f) <<  8
+        | (uint32_t) (b * 255.0f + 0.5f) <<  0;
+}
+
+int
+main (int argc, char **argv)
+{
+#define WIDTH 400
+#define HEIGHT 200
+    int y, x, p;
+    float alpha;
+ 
+    uint32_t *dest = malloc (WIDTH * HEIGHT * 4);
+    uint32_t *src1 = malloc (WIDTH * HEIGHT * 4);
+    pixman_image_t *dest_img, *src1_img;
+   
+    dest_img = pixman_image_create_bits (PIXMAN_a8r8g8b8_sRGB,
+                                        WIDTH, HEIGHT,
+                                        dest,
+                                        WIDTH * 4);
+    src1_img = pixman_image_create_bits (PIXMAN_a8r8g8b8,
+                                        WIDTH, HEIGHT,
+                                        src1,
+                                        WIDTH * 4);
+
+    for (y = 0; y < HEIGHT; y ++)
+    {
+       p = WIDTH * y;
+       for (x = 0; x < WIDTH; x ++)
+       {
+            alpha = (float) x / WIDTH;
+            src1[p + x] = linear_argb_to_premult_argb (alpha, 1, 0, 1);
+            dest[p + x] = linear_argb_to_premult_srgb_argb (1-alpha, 0, 1, 0);
+       }
+    }
+    
+    pixman_image_composite (PIXMAN_OP_ADD, src1_img, NULL, dest_img,
+                           0, 0, 0, 0, 0, 0, WIDTH, HEIGHT);
+    pixman_image_unref (src1_img);
+    free (src1);
+
+    show_image (dest_img);
+    pixman_image_unref (dest_img);
+    free (dest);
+    
+    return 0;
+}