1 files changed, 115 insertions, 0 deletions
diff --git a/src/libjin/Graphics/FontData.cpp b/src/libjin/Graphics/FontData.cpp
new file mode 100644
index 0000000..1b66b12
--- /dev/null
+++ b/src/libjin/Graphics/FontData.cpp
@@ -0,0 +1,115 @@
+#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;
+    }
+
+}
+}
+\ No newline at end of file