72 lines
1.7 KiB
C
72 lines
1.7 KiB
C
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#include <stdio.h>
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#include <stdlib.h>
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#include "pixman.h"
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#include "gtk-utils.h"
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int
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main (int argc, char **argv)
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{
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#define WIDTH 400
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#define HEIGHT 400
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#define TILE_SIZE 25
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pixman_image_t *checkerboard;
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pixman_image_t *destination;
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#define D2F(d) (pixman_double_to_fixed(d))
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pixman_transform_t trans = { {
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{ D2F (-1.96830), D2F (-1.82250), D2F (512.12250)},
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{ D2F (0.00000), D2F (-7.29000), D2F (1458.00000)},
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{ D2F (0.00000), D2F (-0.00911), D2F (0.59231)},
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}};
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int i, j;
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checkerboard = pixman_image_create_bits (PIXMAN_a8r8g8b8,
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WIDTH, HEIGHT,
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NULL, 0);
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destination = pixman_image_create_bits (PIXMAN_a8r8g8b8,
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WIDTH, HEIGHT,
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NULL, 0);
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for (i = 0; i < HEIGHT / TILE_SIZE; ++i)
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{
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for (j = 0; j < WIDTH / TILE_SIZE; ++j)
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{
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double u = (double)(j + 1) / (WIDTH / TILE_SIZE);
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double v = (double)(i + 1) / (HEIGHT / TILE_SIZE);
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pixman_color_t black = { 0, 0, 0, 0xffff };
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pixman_color_t white = {
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v * 0xffff,
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u * 0xffff,
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(1 - (double)u) * 0xffff,
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0xffff };
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pixman_color_t *c;
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pixman_image_t *fill;
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if ((j & 1) != (i & 1))
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c = &black;
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else
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c = &white;
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fill = pixman_image_create_solid_fill (c);
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pixman_image_composite (PIXMAN_OP_SRC, fill, NULL, checkerboard,
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0, 0, 0, 0, j * TILE_SIZE, i * TILE_SIZE,
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TILE_SIZE, TILE_SIZE);
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}
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}
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pixman_image_set_transform (checkerboard, &trans);
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pixman_image_set_filter (checkerboard, PIXMAN_FILTER_BEST, NULL, 0);
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pixman_image_set_repeat (checkerboard, PIXMAN_REPEAT_NONE);
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pixman_image_composite (PIXMAN_OP_SRC,
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checkerboard, NULL, destination,
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0, 0, 0, 0, 0, 0,
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WIDTH, HEIGHT);
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show_image (destination);
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return 0;
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}
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