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  • Committer: Phil Dennis-Jordan
  • Date: 2017-07-21 08:03:43 UTC
  • mfrom: (1.1.1)
  • Revision ID: phil@philjordan.eu-20170721080343-2yr2vdj7713czahv
New upstream release 2.9.0.

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pixman/demos/checkerboard.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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}