2 * Icon generation helpers for slide puzzle game
3 * Copyright © 2022 Nick Bowler
5 * This program is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, either version 3 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see <https://www.gnu.org/licenses/>.
23 * Generate one tile of the program icon at various sizes, which is a 3x3 grid
26 * These functions all operate as follows:
28 * - icon points to the start of the complete image buffer, in row-major
29 * order. Each byte represents one pixel of the icon, so for example the
30 * 16x16 icon requires a 256-byte buffer.
32 * - c controls the byte values that are written to the icon for this tile.
33 * The least significant 8 bits of c encode the primary colour, bits 8-15
34 * encode the dark shade colour, and bits 16-23 encode the light shade
37 * - tile_x and tile_y select which tile to render (each may be 0, 1 or 2).
39 * By calling the function 9 times with all combinations of tile_x/tile_y
40 * values, a complete icon is generated.
43 void icon_tile16(unsigned char *icon, unsigned long c, int tile_x, int tile_y);
44 void icon_tile24(unsigned char *icon, unsigned long c, int tile_x, int tile_y);
45 void icon_tile32(unsigned char *icon, unsigned long c, int tile_x, int tile_y);
46 void icon_tile48(unsigned char *icon, unsigned long c, int tile_x, int tile_y);