128 lines
3.3 KiB
C++
128 lines
3.3 KiB
C++
#include <stdio.h>
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#include <stdlib.h>
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#include <assert.h>
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#include "SDL_surface.h"
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#include "font_render_lcd.h"
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#define MAX_GLYPHSET 256
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typedef struct { uint8_t b, g, r, a; } RenColor;
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typedef struct { int x, y, width, height; } RenRect;
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struct RenImage {
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RenColor *pixels;
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int width, height;
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};
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struct GlyphSetA {
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RenImage *image;
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// FIXME: add glyphs information for AGG implementation
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// stbtt_bakedchar glyphs[256];
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};
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struct RenFontA {
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font_renderer_lcd *renderer;
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float size;
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int height;
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};
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static void* check_alloc(void *ptr) {
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if (!ptr) {
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fprintf(stderr, "Fatal error: memory allocation failed\n");
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exit(EXIT_FAILURE);
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}
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return ptr;
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}
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RenImage* ren_new_image(int width, int height) {
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assert(width > 0 && height > 0);
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RenImage *image = malloc(sizeof(RenImage) + width * height * sizeof(RenColor));
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check_alloc(image);
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image->pixels = (void*) (image + 1);
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image->width = width;
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image->height = height;
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return image;
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}
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void ren_free_image(RenImage *image) {
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free(image);
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}
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RenFontA* ren_load_font_agg(const char *filename, float size) {
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RenFont *font = NULL;
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/* init font */
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font = check_alloc(calloc(1, sizeof(RenFontA)));
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font->size = size;
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font->renderer = new font_renderer_lcd(true, false, true, 1.8);
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font->renderer->load_font(filename);
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// FIXME: figure out correct calculation for font->height with
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// ascent, descent and linegap.
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fit->height = size;
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return font;
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}
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static GlyphSet* load_glyphset_agg(RenFont *font, int idx) {
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GlyphSet *set = check_alloc(calloc(1, sizeof(GlyphSet)));
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/* init image */
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int width = 128;
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int height = 128;
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retry:
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set->image = ren_new_image(width, height);
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/* load glyphs */
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float s =
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stbtt_ScaleForMappingEmToPixels(&font->stbfont, 1) /
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stbtt_ScaleForPixelHeight(&font->stbfont, 1);
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int res = stbtt_BakeFontBitmap(
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font->data, 0, font->size * s, (void*) set->image->pixels,
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width, height, idx * 256, 256, set->glyphs);
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/* retry with a larger image buffer if the buffer wasn't large enough */
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if (res < 0) {
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width *= 2;
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height *= 2;
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ren_free_image(set->image);
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goto retry;
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}
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/* adjust glyph yoffsets and xadvance */
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int ascent, descent, linegap;
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stbtt_GetFontVMetrics(&font->stbfont, &ascent, &descent, &linegap);
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float scale = stbtt_ScaleForMappingEmToPixels(&font->stbfont, font->size);
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int scaled_ascent = ascent * scale + 0.5;
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for (int i = 0; i < 256; i++) {
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set->glyphs[i].yoff += scaled_ascent;
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set->glyphs[i].xadvance = floor(set->glyphs[i].xadvance);
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}
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/* convert 8bit data to 32bit */
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for (int i = width * height - 1; i >= 0; i--) {
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uint8_t n = *((uint8_t*) set->image->pixels + i);
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set->image->pixels[i] = (RenColor) { .r = 255, .g = 255, .b = 255, .a = n };
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}
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return set;
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}
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int main(int argc, char *argv[]) {
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if (argc < 3) {
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fprintf(stderr, "usage: %s <font-filename> <size>\n", argv[0]);
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return 1;
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}
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const char *filename = argv[1];
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const int size = atoi(argv[2]);
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RenFont *font = ren_load_font(filename, size);
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GlyphSet *set = load_glyphset(font, 0);
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SDL_Surface *surface = SDL_CreateRGBSurfaceWithFormatFrom(
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set->image->pixels,
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set->image->width, set->image->height, 32, set->image->width * 4,
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SDL_PIXELFORMAT_RGBA32);
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SDL_SaveBMP(surface, "stb-glyphset.bmp");
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return 0;
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}
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