51 lines
No EOL
1.5 KiB
C++
51 lines
No EOL
1.5 KiB
C++
#include "util.h"
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#include "../lodepng/lodepng.h"
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u8 TILE_ORDER[64] = { 0, 1, 8, 9, 2, 3, 10, 11, 16, 17, 24, 25, 18, 19, 26, 27,
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4, 5, 12, 13, 6, 7, 14, 15, 20, 21, 28, 29, 22, 23, 30, 31,
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32, 33, 40, 41, 34, 35, 42, 43, 48, 49, 56, 57, 50, 51, 58, 59,
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36, 37, 44, 45, 38, 39, 46, 47, 52, 53, 60, 61, 54, 55, 62, 63 };
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u8* image_to_tiles(const char* image, u32 width, u32 height, u32* size) {
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unsigned char* img;
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unsigned int imgWidth, imgHeight;
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if(lodepng_decode32_file(&img, &imgWidth, &imgHeight, image)) {
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printf("ERROR: Could not load png file.\n");
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return NULL;
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}
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if(width == 0) {
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width = imgWidth;
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}
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if(height == 0) {
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height = imgHeight;
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}
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if(imgWidth != width || imgHeight != height) {
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printf("ERROR: Image must be exactly %d x %d in size.\n", width, height);
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return NULL;
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}
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u8* converted = (u8*) malloc(width * height * 2);
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u32 n = 0;
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for(int y = 0; y < height; y += 8) {
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for(int x = 0; x < width; x += 8) {
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for(int k = 0; k < 8 * 8; k++) {
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u32 xx = (u32) (TILE_ORDER[k] & 0x7);
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u32 yy = (u32) (TILE_ORDER[k] >> 3);
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u8* pixel = img + (((y + yy) * width + (x + xx)) * 4);
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converted[n++] = ((pixel[2] >> 4) << 4) | (pixel[3] >> 4);
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converted[n++] = ((pixel[0] >> 4) << 4) | (pixel[1] >> 4);
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}
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}
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}
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if(size != NULL) {
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*size = width * height * 2;
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}
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return converted;
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} |