133 regels
2.7 KiB
C
133 regels
2.7 KiB
C
#include <assert.h>
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#include <ctype.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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int main(int argc, char** argv)
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{
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if (argc != 3)
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{
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fprintf(stderr, "Usage: %s <input image> <output header>\n", argv[0]);
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return 1;
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}
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const char* inFilename = argv[1];
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const char* outFilename = argv[2];
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int tileWidth;
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int tileHeight;
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uint8_t* tileBuffer;
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{
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FILE* inFile = fopen(inFilename, "rb");
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assert(inFile);
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#pragma pack(push,1)
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struct BmpHeader
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{
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char magic[2];
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uint32_t totalSize;
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uint32_t reserved;
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uint32_t offset;
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uint32_t headerSize;
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int32_t width;
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int32_t height;
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uint16_t planes;
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uint16_t depth;
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uint32_t compression;
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uint32_t imageSize;
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int32_t horizontalResolution;
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int32_t verticalResolution;
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uint32_t paletteColorCount;
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uint32_t importantColorcount;
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} bmpHeader;
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#pragma pack(pop)
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// Read the BMP header so we know where the image data is located
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fread(&bmpHeader, 1, sizeof(bmpHeader), inFile);
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assert(bmpHeader.magic[0] == 'B' && bmpHeader.magic[1] == 'M');
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assert(bmpHeader.depth == 8);
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assert(bmpHeader.headerSize == 40);
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// Go to location in file of image data
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fseek(inFile, bmpHeader.offset, SEEK_SET);
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// Read in the image data
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tileBuffer = malloc(bmpHeader.imageSize);
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assert(tileBuffer);
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fread(tileBuffer, 1, bmpHeader.imageSize, inFile);
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tileWidth = bmpHeader.width;
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tileHeight = bmpHeader.height;
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fclose(inFile);
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}
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printf("Input: %s\n", inFilename);
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printf("Output: %s\n", outFilename);
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printf("Width: %d\n", tileWidth);
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printf("Height: %d\n", tileHeight);
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FILE* outFile = fopen(outFilename, "w");
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assert(outFile);
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// Generate the preamble
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{
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fprintf(outFile, "// AUTOMATICALLY GENERATED. DO NOT EDIT.\n");
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fprintf(outFile, "\n");
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fprintf(outFile, "#pragma once\n");
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fprintf(outFile, "\n");
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fprintf(outFile, "#include <stdint.h>\n");
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fprintf(outFile, "\n");
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fprintf(outFile, "\n");
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}
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// Generate the font map with the calculated glyph bytes
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{
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fprintf(outFile, "static const uint8_t tile[%d][%d] =\n", tileHeight, tileWidth);
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fprintf(outFile, "{\n");
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fprintf(outFile, " ");
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int count = 0;
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for (int row = 0; row < tileHeight; ++row)
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{
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for (int col = 0; col < tileWidth; ++col)
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{
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// BMP is laid out bottom-to-top, but we want top-to-bottom (0-indexed)
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int y = tileHeight - row - 1;
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uint8_t paletteIndex = tileBuffer[y * tileWidth + col];
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fprintf(outFile, "%d,", paletteIndex);
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++count;
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// Put a newline after sixteen values to keep it orderly
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if ((count % 16) == 0)
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{
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fprintf(outFile, "\n");
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fprintf(outFile, " ");
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count = 0;
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}
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}
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}
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fprintf(outFile, "};\n");
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}
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fclose(outFile);
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printf("\n");
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printf("DONE\n");
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return 0;
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}
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