1 files changed, 134 insertions, 0 deletions
diff --git a/pixman/demos/conical-test.c b/pixman/demos/conical-test.c
new file mode 100644
index 000000000..1e08e42f7
--- /dev/null
+++ b/pixman/demos/conical-test.c
@@ -0,0 +1,134 @@
+#include "../test/utils.h"
+#include "gtk-utils.h"
+
+#define SIZE 128
+#define GRADIENTS_PER_ROW 7
+#define NUM_ROWS ((NUM_GRADIENTS + GRADIENTS_PER_ROW - 1) / GRADIENTS_PER_ROW)
+#define WIDTH (SIZE * GRADIENTS_PER_ROW)
+#define HEIGHT (SIZE * NUM_ROWS)
+#define NUM_GRADIENTS 35
+
+#define double_to_color(x)					\
+    (((uint32_t) ((x)*65536)) - (((uint32_t) ((x)*65536)) >> 16))
+
+#define PIXMAN_STOP(offset,r,g,b,a)		\
+    { pixman_double_to_fixed (offset),		\
+	{					\
+	    double_to_color (r),		\
+		double_to_color (g),		\
+		double_to_color (b),		\
+		double_to_color (a)		\
+	}					\
+    }
+
+
+static const pixman_gradient_stop_t stops[] = {
+    PIXMAN_STOP (0.25,       1, 0, 0, 0.7),
+    PIXMAN_STOP (0.5,        1, 1, 0, 0.7),
+    PIXMAN_STOP (0.75,       0, 1, 0, 0.7),
+    PIXMAN_STOP (1.0,        0, 0, 1, 0.7)
+};
+
+#define NUM_STOPS (sizeof (stops) / sizeof (stops[0]))
+
+static pixman_image_t *
+create_conical (int index)
+{
+    pixman_point_fixed_t c;
+    double angle;
+
+    c.x = pixman_double_to_fixed (0);
+    c.y = pixman_double_to_fixed (0);
+
+    angle = (0.5 / NUM_GRADIENTS + index / (double)NUM_GRADIENTS) * 720 - 180;
+
+    return pixman_image_create_conical_gradient (
+	&c, pixman_double_to_fixed (angle), stops, NUM_STOPS);
+}
+
+#define CHECK_SIZE 25
+
+static void
+fill_checkerboard (pixman_image_t *image, int width, int height)
+{
+#define C1 0xaaaa
+#define C2 0x8888
+
+    pixman_color_t check1 = { C1, C1, C1, 0xffff };
+    pixman_color_t check2 = { C2, C2, C2, 0xffff };
+    pixman_image_t *c1, *c2;
+    int i, j;
+
+    c1 = pixman_image_create_solid_fill (&check1);
+    c2 = pixman_image_create_solid_fill (&check2);
+
+    for (j = 0; j < height; j += CHECK_SIZE)
+    {
+	for (i = 0; i < width; i += CHECK_SIZE)
+	{
+	    pixman_image_t *src;
+
+	    if ((((i / CHECK_SIZE) ^ (j / CHECK_SIZE)) & 1) == 0)
+		src = c1;
+	    else
+		src = c2;
+	    
+	    pixman_image_composite32 (PIXMAN_OP_SRC, src, NULL, image,
+				      0, 0, 0, 0, i, j,
+				      CHECK_SIZE, CHECK_SIZE);
+	}
+    }
+}
+
+int
+main (int argc, char **argv)
+{
+    pixman_transform_t transform;
+    pixman_image_t *src_img, *dest_img;
+    int i;
+
+    enable_divbyzero_exceptions ();
+
+    dest_img = pixman_image_create_bits (PIXMAN_a8r8g8b8,
+					 WIDTH, HEIGHT,
+					 NULL, 0);
+
+    fill_checkerboard (dest_img, WIDTH, HEIGHT);
+
+    pixman_transform_init_identity (&transform);
+
+    pixman_transform_translate (NULL, &transform,
+				pixman_double_to_fixed (0.5),
+				pixman_double_to_fixed (0.5));
+
+    pixman_transform_scale (NULL, &transform,
+			    pixman_double_to_fixed (SIZE),
+			    pixman_double_to_fixed (SIZE));
+    pixman_transform_translate (NULL, &transform,
+				pixman_double_to_fixed (0.5),
+				pixman_double_to_fixed (0.5));
+
+    for (i = 0; i < NUM_GRADIENTS; i++)
+    {
+	int column = i % GRADIENTS_PER_ROW;
+	int row = i / GRADIENTS_PER_ROW;
+
+	src_img = create_conical (i); 
+	pixman_image_set_repeat (src_img, PIXMAN_REPEAT_NORMAL);
+   
+	pixman_image_set_transform (src_img, &transform);
+	
+	pixman_image_composite32 (
+	    PIXMAN_OP_OVER, src_img, NULL,dest_img,
+	    0, 0, 0, 0, column * SIZE, row * SIZE,
+	    SIZE, SIZE);
+	
+	pixman_image_unref (src_img);
+    }
+
+    show_image (dest_img);
+
+    pixman_image_unref (dest_img);
+
+    return 0;
+}