101 lines
2.4 KiB
C
101 lines
2.4 KiB
C
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#include "../test/utils.h"
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#include "gtk-utils.h"
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#define SIZE 128
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#define GRADIENTS_PER_ROW 7
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#define NUM_ROWS ((NUM_GRADIENTS + GRADIENTS_PER_ROW - 1) / GRADIENTS_PER_ROW)
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#define WIDTH (SIZE * GRADIENTS_PER_ROW)
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#define HEIGHT (SIZE * NUM_ROWS)
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#define NUM_GRADIENTS 35
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#define double_to_color(x) \
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(((uint32_t) ((x)*65536)) - (((uint32_t) ((x)*65536)) >> 16))
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#define PIXMAN_STOP(offset,r,g,b,a) \
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{ pixman_double_to_fixed (offset), \
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{ \
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double_to_color (r), \
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double_to_color (g), \
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double_to_color (b), \
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double_to_color (a) \
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} \
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}
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static const pixman_gradient_stop_t stops[] = {
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PIXMAN_STOP (0.25, 1, 0, 0, 0.7),
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PIXMAN_STOP (0.5, 1, 1, 0, 0.7),
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PIXMAN_STOP (0.75, 0, 1, 0, 0.7),
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PIXMAN_STOP (1.0, 0, 0, 1, 0.7)
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};
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#define NUM_STOPS (sizeof (stops) / sizeof (stops[0]))
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static pixman_image_t *
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create_conical (int index)
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{
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pixman_point_fixed_t c;
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double angle;
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c.x = pixman_double_to_fixed (0);
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c.y = pixman_double_to_fixed (0);
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angle = (0.5 / NUM_GRADIENTS + index / (double)NUM_GRADIENTS) * 720 - 180;
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return pixman_image_create_conical_gradient (
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&c, pixman_double_to_fixed (angle), stops, NUM_STOPS);
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}
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int
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main (int argc, char **argv)
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{
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pixman_transform_t transform;
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pixman_image_t *src_img, *dest_img;
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int i;
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enable_divbyzero_exceptions ();
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dest_img = pixman_image_create_bits (PIXMAN_a8r8g8b8,
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WIDTH, HEIGHT,
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NULL, 0);
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draw_checkerboard (dest_img, 25, 0xffaaaaaa, 0xff888888);
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pixman_transform_init_identity (&transform);
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pixman_transform_translate (NULL, &transform,
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pixman_double_to_fixed (0.5),
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pixman_double_to_fixed (0.5));
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pixman_transform_scale (NULL, &transform,
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pixman_double_to_fixed (SIZE),
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pixman_double_to_fixed (SIZE));
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pixman_transform_translate (NULL, &transform,
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pixman_double_to_fixed (0.5),
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pixman_double_to_fixed (0.5));
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for (i = 0; i < NUM_GRADIENTS; i++)
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{
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int column = i % GRADIENTS_PER_ROW;
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int row = i / GRADIENTS_PER_ROW;
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src_img = create_conical (i);
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pixman_image_set_repeat (src_img, PIXMAN_REPEAT_NORMAL);
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pixman_image_set_transform (src_img, &transform);
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pixman_image_composite32 (
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PIXMAN_OP_OVER, src_img, NULL,dest_img,
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0, 0, 0, 0, column * SIZE, row * SIZE,
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SIZE, SIZE);
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pixman_image_unref (src_img);
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}
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show_image (dest_img);
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pixman_image_unref (dest_img);
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return 0;
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}
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