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author | 2015-08-28 09:58:54 +0800 | |
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committer | 2015-09-01 12:44:00 +0800 | |
commit | e44e3482bdb4d0ebde2d8b41830ac2cdb07948fb (patch) | |
tree | 66b09f592c55df2878107a468a91d21506104d3f /qemu/pixman/demos/srgb-test.c | |
parent | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (diff) |
Add qemu 2.4.0
Change-Id: Ic99cbad4b61f8b127b7dc74d04576c0bcbaaf4f5
Signed-off-by: Yang Zhang <yang.z.zhang@intel.com>
Diffstat (limited to 'qemu/pixman/demos/srgb-test.c')
-rw-r--r-- | qemu/pixman/demos/srgb-test.c | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/qemu/pixman/demos/srgb-test.c b/qemu/pixman/demos/srgb-test.c new file mode 100644 index 000000000..681d52181 --- /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; +} |