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#include "FontData.h"
#define STB_TRUETYPE_IMPLEMENTATION
#include "../3rdparty/stb/stb_truetype.h"
#include <stdio.h>
namespace jin
{
namespace graphics
{
FontData* FontData::createFontData(const unsigned char* data, unsigned int size)
{
FontData* font = nullptr;
try
{
font = new FontData(data, size);
return font;
}
catch (...)
{
return nullptr;
}
}
FontData::FontData(const unsigned char* d, unsigned int s)
{
raw.size = s;
raw.data = (unsigned char*)malloc(s);
memcpy(raw.data, d, s);
if (!stbtt_InitFont(&info, (const unsigned char*)raw.data, 0))
{
delete raw.data;
throw 0;
}
/* push default fontsize */
pushFontsize(FONT_SIZE);
}
FontData::~FontData()
{
free(raw.data);
}
/*
* (0, 0)
* +--------------+ ascent
* | +--------+ |
* | | | |
* | | bitmap | |
* +--|--------|--+ baseline
* | +--------+ |
* +--|-----------+ decent
* | |
* leftSideBearing |
* |
* advanceWidth
*/
void FontData::getVMetrics(int* baseline, int* descent)
{
float scale = scales.back();
int ascent;
stbtt_GetFontVMetrics(&info, &ascent, descent, 0);
*baseline = (int)(ascent*scale) + 1; // slight adjustment
*descent = *baseline - (int)(*descent*scale) + 1;
}
void FontData::getHMetrics(unsigned int codepoint, int* advanceWidth, int* leftSideBearing)
{
float scale = scales.back();
int adw, lsb;
stbtt_GetCodepointHMetrics(&info, codepoint, &adw, &lsb);
*advanceWidth = (int)(adw*scale);
*leftSideBearing = (int)(lsb*scale);
}
void FontData::pushFontsize(unsigned int fs)
{
float sc = stbtt_ScaleForPixelHeight(&info, fs);
scales.push_back(sc);
}
void FontData::popFontsize()
{
/* always keep default font size on the bottom of stack */
if(scales.size() > 1)
scales.pop_back();
}
Channel* FontData::getCodepointBitmapAlpha(unsigned int codepoint, int* width, int* height, int* xoff, int* yoff) const
{
float scale = scales.back();
Channel* bitmap = stbtt_GetCodepointBitmap(&info, scale, scale, codepoint, width, height, xoff, yoff);
return bitmap;
}
Color* FontData::getCodepointBitmap(unsigned int codepoint, int* width, int* height, int* xoff, int* yoff) const
{
float scale = scales.back();
Channel* bitmap = stbtt_GetCodepointBitmap(&info, scale, scale, codepoint, width, height, xoff, yoff);
int w = *width, h = *height;
//int xo = *xoff, yo = *yoff;
Color* bitmap32 = new Color[w*h];
for (int y = 0; y < h; ++y)
{
for (int x = 0; x < w; ++x)
{
bitmap32[x + y * w].set(0xff, 0xff, 0xff, bitmap[x + y * w]);
}
}
free(bitmap);
return bitmap32;
}
}
}
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