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2020-embedded-game-programming/tools/src/font_processor.c

247 lines
5.2 KiB
C

#include <assert.h>
#include <ctype.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main(int argc, char** argv)
{
if (argc != 6)
{
fprintf(stderr, "Usage: %s <input image> <layout file> <output header> <glyph width> <glyph height>\n", argv[0]);
return 1;
}
const char* inFilename = argv[1];
const char* layoutFilename = argv[2];
const char* outFilename = argv[3];
const int glyphWidth = atoi(argv[4]);
const int glyphHeight = atoi(argv[5]);
int imageWidth;
int imageHeight;
uint8_t* imageBuffer;
{
FILE* inFile = fopen(inFilename, "rb");
assert(inFile);
#pragma pack(push,1)
struct BmpHeader
{
char magic[2];
uint32_t totalSize;
uint32_t reserved;
uint32_t offset;
uint32_t headerSize;
int32_t width;
int32_t height;
uint16_t planes;
uint16_t depth;
uint32_t compression;
uint32_t imageSize;
int32_t horizontalResolution;
int32_t verticalResolution;
uint32_t paletteColorCount;
uint32_t importantColorcount;
} bmpHeader;
#pragma pack(pop)
// Read the BMP header so we know where the image data is located
fread(&bmpHeader, 1, sizeof(bmpHeader), inFile);
assert(bmpHeader.magic[0] == 'B' && bmpHeader.magic[1] == 'M');
assert(bmpHeader.depth == 8);
assert(bmpHeader.headerSize == 40);
// Go to location in file of image data
fseek(inFile, bmpHeader.offset, SEEK_SET);
// Read in the image data
imageBuffer = malloc(bmpHeader.imageSize);
assert(imageBuffer);
fread(imageBuffer, 1, bmpHeader.imageSize, inFile);
imageWidth = bmpHeader.width;
imageHeight = bmpHeader.height;
fclose(inFile);
}
char** glyphLayout = NULL;
int layoutRows = 0;
{
FILE* layoutFile = fopen(layoutFilename, "r");
assert(layoutFile);
// Count the number of lines in the file
while (!feof(layoutFile))
{
char c = fgetc(layoutFile);
if (c == '\n')
{
++layoutRows;
}
}
// Return file position indicator to start
rewind(layoutFile);
// Allocate enough memory for one string pointer per row
glyphLayout = malloc(sizeof(*glyphLayout) * layoutRows);
assert(glyphLayout);
// Read the file into memory
for (int rowIndex = 0; rowIndex < layoutRows; ++rowIndex)
{
char* line = NULL;
size_t len = 0;
getline(&line, &len, layoutFile);
int newlinePosition = strlen(line) - 1;
if (line[newlinePosition] == '\n')
{
line[newlinePosition] = '\0';
}
glyphLayout[rowIndex] = line;
}
fclose(layoutFile);
}
printf("Input: %s\n", inFilename);
printf("Output: %s\n", outFilename);
printf("Width: %d\n", imageWidth);
printf("Height: %d\n", imageHeight);
printf("Glyph: %dx%d\n\n", glyphWidth, glyphHeight);
FILE* outFile = fopen(outFilename, "w");
assert(outFile);
// Generate the preamble
{
fprintf(outFile, "// AUTOMATICALLY GENERATED. DO NOT EDIT.\n");
fprintf(outFile, "\n");
fprintf(outFile, "#pragma once\n");
fprintf(outFile, "\n");
fprintf(outFile, "#include <assert.h>\n");
fprintf(outFile, "#include <stdint.h>\n");
fprintf(outFile, "\n");
fprintf(outFile, "\n");
fprintf(outFile, "static const int GLYPH_WIDTH = %d;\n", glyphWidth);
fprintf(outFile, "static const int GLYPH_HEIGHT = %d;\n", glyphHeight);
fprintf(outFile, "\n");
fprintf(outFile, "\n");
}
// Generate the GetGlyphIndex function
int glyphCount = 0;
{
fprintf(outFile, "int GetGlyphIndex(char c)\n");
fprintf(outFile, "{\n");
fprintf(outFile, " switch (c)\n");
fprintf(outFile, " {\n");
for (int row = 0; row < layoutRows; ++row)
{
int glyphsInRow = strlen(glyphLayout[row]);
for (int glyph = 0; glyph < glyphsInRow; ++glyph)
{
char c = glyphLayout[row][glyph];
fprintf(outFile, " ");
if (isalpha(c))
{
fprintf(outFile, "case '%c': ", tolower(c));
}
fprintf(outFile, "case '%c': { return %d; break; }\n", c, glyphCount);
++glyphCount;
}
}
fprintf(outFile, " default: { assert(NULL); break; }\n");
fprintf(outFile, " }\n");
fprintf(outFile, "}\n\n");
}
// Generate the font map with the calculated glyph bytes
{
fprintf(outFile, "static const uint16_t glyphMap[%d][%d] =\n", glyphCount, glyphHeight);
fprintf(outFile, "{\n");
for (int y = 0; y < layoutRows; ++y)
{
int glyphsInRow = strlen(glyphLayout[y]);
for (int x = 0; x < glyphsInRow; ++x)
{
char c = glyphLayout[y][x];
fprintf(outFile, " // %c\n", c);
fprintf(outFile, " {\n");
fprintf(outFile, " ");
int count = 0;
for (int row = y * glyphHeight; row < (y + 1) * glyphHeight; ++row)
{
uint16_t val = 0;
for (int col = x * glyphWidth; col < (x + 1) * glyphWidth; ++col)
{
// BMP is laid out bottom-to-top, but we want top-to-bottom (0-indexed)
int y = imageHeight - row - 1;
uint8_t pixel = imageBuffer[y * imageWidth + col];
int bitPosition = 15 - (col % glyphWidth);
val |= (pixel << bitPosition);
}
fprintf(outFile, "0x%04X,", val);
++count;
// Put a newline after four values to keep it orderly
if ((count % 4) == 0)
{
fprintf(outFile, "\n");
fprintf(outFile, " ");
count = 0;
}
}
fprintf(outFile, "},\n\n");
}
}
fprintf(outFile, "};\n");
}
fclose(outFile);
printf("DONE\n");
return 0;
}