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Support aliased font texture generation

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Useful for bitmaps pixelated fonts where anti-aliasing is not desired!
Change also enables additional font generation mechanisms in a future (cleartype, hinting...).
This commit is contained in:
Ray 2018-09-06 16:56:21 +02:00
parent 1fcb3c0317
commit dfb8837c46
3 changed files with 28 additions and 9 deletions
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23
src/text.c
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@ -283,7 +283,7 @@ Font LoadFont(const char *fileName)
{
font.baseSize = DEFAULT_TTF_FONTSIZE;
font.charsCount = DEFAULT_TTF_NUMCHARS;
font.chars = LoadFontData(fileName, font.baseSize, NULL, font.charsCount, false);
font.chars = LoadFontData(fileName, font.baseSize, NULL, font.charsCount, FONT_DEFAULT);
Image atlas = GenImageFontAtlas(font.chars, font.charsCount, font.baseSize, 4, 0);
font.texture = LoadTextureFromImage(atlas);
UnloadImage(atlas);
@ -319,8 +319,8 @@ Font LoadFontEx(const char *fileName, int fontSize, int charsCount, int *fontCha
font.baseSize = fontSize;
font.charsCount = (charsCount > 0) ? charsCount : 95;
font.chars = LoadFontData(fileName, font.baseSize, fontChars, font.charsCount, false);
Image atlas = GenImageFontAtlas(font.chars, font.charsCount, font.baseSize, 0, 0);
font.chars = LoadFontData(fileName, font.baseSize, fontChars, font.charsCount, FONT_DEFAULT);
Image atlas = GenImageFontAtlas(font.chars, font.charsCount, font.baseSize, 2, 0);
font.texture = LoadTextureFromImage(atlas);
UnloadImage(atlas);
@ -329,7 +329,7 @@ Font LoadFontEx(const char *fileName, int fontSize, int charsCount, int *fontCha
// Load font data for further use
// NOTE: Requires TTF font and can generate SDF data
CharInfo *LoadFontData(const char *fileName, int fontSize, int *fontChars, int charsCount, bool sdf)
CharInfo *LoadFontData(const char *fileName, int fontSize, int *fontChars, int charsCount, int type)
{
// NOTE: Using some SDF generation default values,
// trades off precision with ability to handle *smaller* sizes
@ -337,6 +337,8 @@ CharInfo *LoadFontData(const char *fileName, int fontSize, int *fontChars, int c
#define SDF_ON_EDGE_VALUE 128
#define SDF_PIXEL_DIST_SCALE 64.0f
#define BITMAP_ALPHA_THRESHOLD 80
// In case no chars count provided, default to 95
charsCount = (charsCount > 0) ? charsCount : 95;
@ -390,9 +392,20 @@ CharInfo *LoadFontData(const char *fileName, int fontSize, int *fontChars, int c
// stbtt_GetCodepointBitmapBox() -- how big the bitmap must be
// stbtt_MakeCodepointBitmap() -- renders into bitmap you provide
if (!sdf) chars[i].data = stbtt_GetCodepointBitmap(&fontInfo, scaleFactor, scaleFactor, ch, &chw, &chh, &chars[i].offsetX, &chars[i].offsetY);
if (type != FONT_SDF) chars[i].data = stbtt_GetCodepointBitmap(&fontInfo, scaleFactor, scaleFactor, ch, &chw, &chh, &chars[i].offsetX, &chars[i].offsetY);
else if (ch != 32) chars[i].data = stbtt_GetCodepointSDF(&fontInfo, scaleFactor, ch, SDF_CHAR_PADDING, SDF_ON_EDGE_VALUE, SDF_PIXEL_DIST_SCALE, &chw, &chh, &chars[i].offsetX, &chars[i].offsetY);
if (type == FONT_BITMAP)
{
// Aliased bitmap (black & white) font generation, avoiding anti-aliasing
// NOTE: For optimum results, bitmap font should be generated at base pixel size
for (int p = 0; p < chw*chh; p++)
{
if (chars[i].data[p] < BITMAP_ALPHA_THRESHOLD) chars[i].data[p] = 0;
else chars[i].data[p] = 255;
}
}
chars[i].rec.width = (float)chw;
chars[i].rec.height = (float)chh;
chars[i].offsetY += (int)((float)ascent*scaleFactor);