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Calculate exact image size in GenImageFontAtlas

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Calculate exact image size with a method based on total glyph width and glyph row count
Current method seemed a little bit overkill with square root, log and power functions and only approximates image size which can be wonky with some weird fonts like cursive fonts.
Proposed method calculates image size directly with a simpler method and results exact image size needed.
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Hanaxar 2023-03-17 13:30:52 +03:00 committed by GitHub
parent 40d01162b9
commit c819af1d40
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1 changed files with 11 additions and 8 deletions
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19
src/rtext.c
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@ -694,14 +694,17 @@ Image GenImageFontAtlas(const GlyphInfo *chars, Rectangle **charRecs, int glyphC
// NOTE: Rectangles memory is loaded here!
Rectangle *recs = (Rectangle *)RL_MALLOC(glyphCount*sizeof(Rectangle));
// Calculate image size based on required pixel area
// NOTE 1: Image is forced to be squared and POT... very conservative!
// NOTE 2: SDF font characters already contain an internal padding,
// so image size would result bigger than default font type
float requiredArea = 0;
for (int i = 0; i < glyphCount; i++) requiredArea += ((chars[i].image.width + 2*padding)*(fontSize + 2*padding));
float guessSize = sqrtf(requiredArea)*1.4f;
int imageSize = (int)powf(2, ceilf(logf((float)guessSize)/logf(2))); // Calculate next POT
// Calculate image size based on total glyph width and glyph row count
int totalWidth = 0;
for (int i = 0; i < glyphCount; i++) totalWidth += chars[i].image.width + 2*padding;
int imageSize = 64; // A minimum starting value to avoid unnecessary calculation steps for very small images
int rowCount = 0;
do
{
imageSize *= 2; // Double the size of image (to keep POT)
rowCount = imageSize/(fontSize + 2*padding) + 1; // Calculate new row count for the new image size
}
while (totalWidth > imageSize*rowCount);
atlas.width = imageSize; // Atlas bitmap width
atlas.height = imageSize; // Atlas bitmap height