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#if !defined(EDITOR_FONT_H)
#define EDITOR_FONT_H
#include <stdarg.h>
#include <stdio.h>
// TODO(luca): UTF8 handling
typedef struct font font;
struct font
{
stbtt_fontinfo Info;
s32 Ascent;
s32 Descent;
s32 LineGap;
v2 BoundingBox[2];
b32 Initialized;
};
//~ API
internal f32
GetBaseline(font *Font, f32 Scale)
{
f32 Result = Scale*(f32)(Font->Ascent - Font->Descent + Font->LineGap);
return Result;
}
internal void
InitFont(font *Font, char *FilePath)
{
str8 File = OS_ReadEntireFileIntoMemory(FilePath);
if(File.Size)
{
if(stbtt_InitFont(&Font->Info, File.Data, stbtt_GetFontOffsetForIndex(File.Data, 0)))
{
Font->Info.data = (u8 *)File.Data;
s32 X0, Y0, X1, Y1;
stbtt_GetFontBoundingBox(&Font->Info, &X0, &Y0, &X1, &Y1);
Font->BoundingBox[0] = V2S32(X0, Y0);
Font->BoundingBox[1] = V2S32(X1, Y1);
stbtt_GetFontVMetrics(&Font->Info, &Font->Ascent, &Font->Descent, &Font->LineGap);
Font->Initialized = true;
}
else
{
// TODO(luca): Logging
}
}
else
{
// TODO(luca): Logging
}
}
//- Rendering
internal void
DrawCharacter(app_offscreen_buffer *Buffer, u8 *FontBitmap,
int FontWidth, int FontHeight,
int XOffset, int YOffset,
u32 Color)
{
s32 MinX = 0;
s32 MinY = 0;
s32 MaxX = FontWidth;
s32 MaxY = FontHeight;
if(XOffset < 0)
{
MinX = -XOffset;
XOffset = 0;
}
if(YOffset < 0)
{
MinY = -YOffset;
YOffset = 0;
}
if(XOffset + FontWidth > Buffer->Width)
{
MaxX -= ((XOffset + FontWidth) - Buffer->Width);
}
if(YOffset + FontHeight > Buffer->Height)
{
MaxY -= ((YOffset + FontHeight) - Buffer->Height);
}
u8 *Row = (u8 *)(Buffer->Pixels) +
(YOffset*Buffer->Pitch) +
(XOffset*Buffer->BytesPerPixel);
for(int Y = MinY;
Y < MaxY;
Y++)
{
u32 *Pixel = (u32 *)Row;
for(int X = MinX;
X < MaxX;
X++)
{
u8 Brightness = FontBitmap[Y*FontWidth+X];
f32 Alpha = ((f32)Brightness/255.0f);
#if 0
f32 R = Lerp(Color.R*255.0f, DR, Alpha);
f32 G = Lerp(Color.G*255.0f, DG, Alpha);
f32 B = Lerp(Color.B*255.0f, DB, Alpha);
f32 A = 255.0f;
#else
f32 SR = (f32)((Color >> 16) & 0xFF);
f32 SG = (f32)((Color >> 8) & 0xFF);
f32 SB = (f32)((Color >> 0) & 0xFF);
f32 R = SR*Alpha;
f32 G = SG*Alpha;
f32 B = SB*Alpha;
f32 A = Brightness;
#endif
u32 Value = (((u32)(A) << 24) |
((u32)(R) << 16) |
((u32)(G) << 8) |
((u32)(B) << 0));
*Pixel = Value;
Pixel += 1;
}
Row += Buffer->Pitch;
}
}
#endif //EDITOR_FONT_H
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