143 lines
3.7 KiB
C++
143 lines
3.7 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_renderer_alpha.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_alpha *renderer;
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float size;
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int height;
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};
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template <typename T>
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static T* check_alloc(T *ptr) {
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if (ptr == 0) {
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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 = (RenImage *) malloc(sizeof(RenImage) + width * height * sizeof(RenColor));
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check_alloc(image);
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image->pixels = (RenColor*) (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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RenFontA *font = NULL;
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/* init font */
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font = (RenFontA *) check_alloc(calloc(1, sizeof(RenFontA)));
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font->size = size;
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font->renderer = new font_renderer_alpha(true, false);
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font->renderer->load_font(filename);
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int ascender, descender;
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font->renderer->get_font_vmetrics(ascender, descender);
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fprintf(stderr, "Font metrics ascender: %d descender: %d\n", ascender, descender);
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float scale = font->renderer->scale_for_em_to_pixels(size);
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font->height = (ascender - descender) * scale + 0.5;
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fprintf(stderr, "Font height: %d\n", font->height);
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return font;
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}
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static GlyphSetA* load_glyphset_agg(RenFontA *font, int idx) {
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const int pixel_size = 1;
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GlyphSetA *set = (GlyphSetA *) check_alloc(calloc(1, sizeof(GlyphSetA)));
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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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memset(set->image->pixels, 0x00, width * height * pixel_size);
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agg::rendering_buffer ren_buf((agg::int8u *) set->image->pixels, width, height, -width * pixel_size);
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// FIXME: figure out how to precisely layout each glyph.
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double x = 4, y = height - font->size * 3 / 2;
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int res = 0;
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const agg::alpha8 text_color(0xff);
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for (int i = 0; i < 256; i++) {
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if (x + font->size * 3 / 2 > width) {
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x = 4;
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y -= font->size * 3 / 2;
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}
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if (y < 0) {
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res = -1;
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break;
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}
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// FIXME: we are ignoring idx and with a char we cannot pass codepoint > 255.
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char text[2] = {char(i % 256), 0};
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// FIXME: using font->size below is wrong.
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font->renderer->render_text(ren_buf, font->size, text_color, x, y, text);
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}
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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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/* 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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RenColor c = {0xff, 0xff, 0xff, n};
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set->image->pixels[i] = c;
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}
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return set;
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}
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extern "C" int main(int argc, char *argv[]);
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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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RenFontA *font = ren_load_font_agg(filename, size);
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GlyphSetA *set = load_glyphset_agg(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, "agg-glyphset.bmp");
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return 0;
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}
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