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#include "sfont.h"
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typedef struct {
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/* 8x14 */
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unsigned char bitmap[14];
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} egachar;
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typedef struct {
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egachar charset[256];
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} egafont;
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sdlfont *read_ega_sdlfont(SDL_Renderer *renderer, const char *filename) {
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egafont font;
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FILE *f = fopen(filename, "r");
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fread(&font, sizeof(egafont), 1, f);
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fclose(f);
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sdlfont *sfont = malloc(sizeof(*sfont));
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for (int i = 0; i < 256; ++i) {
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egachar c = font.charset[i];
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SDL_Texture *t = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_RGB24, SDL_TEXTUREACCESS_TARGET, 8, 14);
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SDL_SetRenderTarget(renderer, t);
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SDL_RenderClear(renderer);
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for (int row = 0; row < 14; ++row) {
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unsigned char rowdata = c.bitmap[row],
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mask = 0x80;
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for (int offset = 0; offset < 8; ++offset) {
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if (rowdata & mask) {
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SDL_RenderDrawPoint(renderer, offset, row);
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}
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mask /= 2;
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}
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}
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sfont->charset[i] = t;
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}
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SDL_SetRenderTarget(renderer, NULL);
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return sfont;
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}
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void render_sfont(SDL_Renderer *renderer, sdlfont *sfont, int character, int x, int y) {
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SDL_Rect src = { 0, 0, 8, 14 };
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SDL_Rect dest = { x, y, 8, 14 };
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SDL_RenderCopy(renderer, sfont->charset[character], &src, &dest);
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}
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void free_sdlfont(sdlfont *sfont) {
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for (int i = 0; i < 256; ++i) {
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SDL_DestroyTexture(sfont->charset[i]);
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}
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free(sfont);
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}
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/* vim: set sw=4 et: */
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