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-rw-r--r--pixman/demos/srgb-trap-test.c119
1 files changed, 119 insertions, 0 deletions
diff --git a/pixman/demos/srgb-trap-test.c b/pixman/demos/srgb-trap-test.c
new file mode 100644
index 000000000..d5ae16a06
--- /dev/null
+++ b/pixman/demos/srgb-trap-test.c
@@ -0,0 +1,119 @@
+#include <math.h>
+#include "pixman.h"
+#include "gtk-utils.h"
+
+#define F(x) \
+ pixman_double_to_fixed (x)
+
+#define WIDTH 600
+#define HEIGHT 300
+
+static uint16_t
+convert_to_srgb (uint16_t in)
+{
+ double d = in * (1/65535.0);
+ double a = 0.055;
+
+ if (d < 0.0031308)
+ d = 12.92 * d;
+ else
+ d = (1 + a) * pow (d, 1 / 2.4) - a;
+
+ return (d * 65535.0) + 0.5;
+}
+
+static void
+convert_color (pixman_color_t *dest_srgb, pixman_color_t *linear)
+{
+ dest_srgb->alpha = convert_to_srgb (linear->alpha);
+ dest_srgb->red = convert_to_srgb (linear->red);
+ dest_srgb->green = convert_to_srgb (linear->green);
+ dest_srgb->blue = convert_to_srgb (linear->blue);
+}
+
+int
+main (int argc, char **argv)
+{
+ static const pixman_trapezoid_t traps[] =
+ {
+ { F(10.10), F(280.0),
+ { { F(20.0), F(10.10) },
+ { F(5.3), F(280.0) } },
+ { { F(20.3), F(10.10) },
+ { F(5.6), F(280.0) } }
+ },
+ { F(10.10), F(280.0),
+ { { F(40.0), F(10.10) },
+ { F(15.3), F(280.0) } },
+ { { F(41.0), F(10.10) },
+ { F(16.3), F(280.0) } }
+ },
+ { F(10.10), F(280.0),
+ { { F(120.0), F(10.10) },
+ { F(5.3), F(280.0) } },
+ { { F(128.3), F(10.10) },
+ { F(6.6), F(280.0) } }
+ },
+ { F(10.10), F(280.0),
+ { { F(60.0), F(10.10) },
+ { F(25.3), F(280.0) } },
+ { { F(61.0), F(10.10) },
+ { F(26.3), F(280.0) } }
+ },
+ { F(10.10), F(280.0),
+ { { F(90.0), F(10.10) },
+ { F(55.3), F(280.0) } },
+ { { F(93.0), F(10.10) },
+ { F(58.3), F(280.0) } }
+ },
+ { F(130.10), F(150.0),
+ { { F(100.0), F(130.10) },
+ { F(250.3), F(150.0) } },
+ { { F(110.0), F(130.10) },
+ { F(260.3), F(150.0) } }
+ },
+ { F(170.10), F(240.0),
+ { { F(100.0), F(170.10) },
+ { F(120.3), F(240.0) } },
+ { { F(250.0), F(170.10) },
+ { F(250.3), F(240.0) } }
+ },
+ };
+
+ pixman_image_t *src, *dest_srgb, *dest_linear;
+ pixman_color_t bg = { 0x0000, 0x0000, 0x0000, 0xffff };
+ pixman_color_t fg = { 0xffff, 0xffff, 0xffff, 0xffff };
+ pixman_color_t fg_srgb;
+ uint32_t *d;
+
+ d = malloc (WIDTH * HEIGHT * 4);
+
+ dest_srgb = pixman_image_create_bits (
+ PIXMAN_a8r8g8b8_sRGB, WIDTH, HEIGHT, d, WIDTH * 4);
+ dest_linear = pixman_image_create_bits (
+ PIXMAN_a8r8g8b8, WIDTH, HEIGHT, d, WIDTH * 4);
+
+ src = pixman_image_create_solid_fill (&bg);
+ pixman_image_composite32 (PIXMAN_OP_SRC,
+ src, NULL, dest_srgb,
+ 0, 0, 0, 0, 0, 0, WIDTH, HEIGHT);
+
+ src = pixman_image_create_solid_fill (&fg);
+
+ pixman_composite_trapezoids (PIXMAN_OP_OVER,
+ src, dest_srgb, PIXMAN_a8,
+ 0, 0, 10, 10, G_N_ELEMENTS (traps), traps);
+
+ convert_color (&fg_srgb, &fg);
+ src = pixman_image_create_solid_fill (&fg_srgb);
+
+ pixman_composite_trapezoids (PIXMAN_OP_OVER,
+ src, dest_linear, PIXMAN_a8,
+ 0, 0, 310, 10, G_N_ELEMENTS (traps), traps);
+
+ show_image (dest_linear);
+ pixman_image_unref(dest_linear);
+ free(d);
+
+ return 0;
+}