renderd7/source/NFontApi.cpp

#include <renderd7/Fonts/NFontApi.hpp>
#define STB_TRUETYPE_IMPLEMENTATION // force following include to generate
                                    // implementation
#include <renderd7/external/stb_truetype.h>

#define STB_IMAGE_WRITE_IMPLEMENTATION
#include <renderd7/external/stb_image_write.h>

#include <fstream>

RenderD7::NFontApi::NFontApi() {}

RenderD7::NFontApi::~NFontApi() {}

void RenderD7::NFontApi::LoadTTF(std::string path) {
  /////READ FILE
  unsigned char *buffer;
  long size = 0;
  std::fstream ttf__(path, std::ios::in | std::ios::binary);
  if(!ttf__.is_open()) {
    return; // Add Error Handler in future
  }
  ttf__.seekg(0, std::ios::end);
  size = ttf__.tellg();
  ttf__.seekg(0, std::ios::beg);
  buffer = (unsigned char *)malloc(size);
  ttf__.read(reinterpret_cast<char*>(buffer), size);
  ttf__.close();
  /////Setup Font
  if (!stbtt_InitFont(&font, buffer, 0)) {
    printf("failed\n");
    status += "failed\n";
    return;
  }
  status += "success!\n";
  b_h = 128;
  b_w = 512;
  l_h = 24; /* line height */
  scale = stbtt_ScaleForPixelHeight(&font, l_h);

  stbtt_GetFontVMetrics(&font, &ascent, &decent, &linegap);
  linespace = scale * (ascent - decent + linegap);

  baseline = (int)(ascent * scale);
  height = (int)((ascent - decent) * scale);
}

unsigned char *RenderD7::NFontApi::GetGlyphBitmap(char glyph) {
  // stbtt_GetGlyphBitmapBox(&font, glyph, scale, scale, &x0, &y0, &x1, &y1);
  stbtt_GetCodepointBitmapBox(&font, glyph, scale, scale, &x0, &y0, &x1, &y1);
  w = x1 - x0;
  h = y1 - y0;

  unsigned char *bitmap;
  bitmap = stbtt_GetCodepointBitmap(&font, scale, scale, glyph, &w, &h, 0, 0);
  return bitmap;
}

int RenderD7::NFontApi::GetGlyphHeight(char glyph) {
  stbtt_GetCodepointBitmapBox(&font, glyph, scale, scale, &x0, &y0, &x1, &y1);
  w = x1 - x0;
  h = y1 - y0;
  return h;
}

int RenderD7::NFontApi::GetGlyphWidth(char glyph) {
  stbtt_GetCodepointBitmapBox(&font, glyph, scale, scale, &x0, &y0, &x1, &y1);
  w = x1 - x0;
  h = y1 - y0;
  return w;
}