MrMonopoly/raylib
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Calculate exact image size in GenImageFontAtlas

Browse Source 
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.
This commit is contained in:
Hanaxar 2023-03-17 13:30:52 +03:00 committed by GitHub
parent 40d01162b9
commit c819af1d40
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 11 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
src/rtext.c
View File

@ -694,14 +694,17 @@ Image GenImageFontAtlas(const GlyphInfo *chars, Rectangle **charRecs, int glyphC
// NOTE: Rectangles memory is loaded here! // NOTE: Rectangles memory is loaded here!
Rectangle *recs = (Rectangle *)RL_MALLOC(glyphCount*sizeof(Rectangle)); Rectangle *recs = (Rectangle *)RL_MALLOC(glyphCount*sizeof(Rectangle));
// Calculate image size based on required pixel area // Calculate image size based on total glyph width and glyph row count
// NOTE 1: Image is forced to be squared and POT... very conservative! int totalWidth = 0;
// NOTE 2: SDF font characters already contain an internal padding, for (int i = 0; i < glyphCount; i++) totalWidth += chars[i].image.width + 2*padding;
// so image size would result bigger than default font type int imageSize = 64; // A minimum starting value to avoid unnecessary calculation steps for very small images
float requiredArea = 0; int rowCount = 0;
for (int i = 0; i < glyphCount; i++) requiredArea += ((chars[i].image.width + 2*padding)*(fontSize + 2*padding)); do
float guessSize = sqrtf(requiredArea)*1.4f; {
int imageSize = (int)powf(2, ceilf(logf((float)guessSize)/logf(2))); // Calculate next POT 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.width = imageSize; // Atlas bitmap width
atlas.height = imageSize; // Atlas bitmap height atlas.height = imageSize; // Atlas bitmap height