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implement dynamic font atlas resizing in GenImageFontAtlas()

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iikare 2022-06-26 21:11:46 -07:00
parent e9fcc8a391
commit 6280b0a6ce
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GPG Key ID: 4906067E1F6AAB8C
1 changed files with 76 additions and 36 deletions
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112
src/rtext.c
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@ -690,6 +690,10 @@ Image GenImageFontAtlas(const GlyphInfo *chars, Rectangle **charRecs, int glyphC
float guessSize = sqrtf(requiredArea)*1.4f;
int imageSize = (int)powf(2, ceilf(logf((float)guessSize)/logf(2))); // Calculate next POT
int currentRepeatCount = 0;
const int maxRepeatCount = 2;
bool undersizedAtlasFlag = false;
atlas.width = imageSize; // Atlas bitmap width
atlas.height = imageSize; // Atlas bitmap height
atlas.data = (unsigned char *)RL_CALLOC(1, atlas.width*atlas.height); // Create a bitmap to store characters (8 bpp)
@ -701,52 +705,88 @@ Image GenImageFontAtlas(const GlyphInfo *chars, Rectangle **charRecs, int glyphC
if (packMethod == 0) // Use basic packing algorithm
{
int offsetX = padding;
int offsetY = padding;
// NOTE: Using simple packaging, one char after another
for (int i = 0; i < glyphCount; i++)
// When the guesstimate of the atlas size is determined to be undersized,
// repeat the atlas generation process with an atlas data texture of a size
// that is double the previous size, up to a limit of `maxRepeatCount` times
while (currentRepeatCount < maxRepeatCount)
{
// Copy pixel data from fc.data to atlas
for (int y = 0; y < chars[i].image.height; y++)
if (currentRepeatCount > 0)
{
for (int x = 0; x < chars[i].image.width; x++)
{
((unsigned char *)atlas.data)[(offsetY + y)*atlas.width + (offsetX + x)] = ((unsigned char *)chars[i].image.data)[y*chars[i].image.width + x];
}
// Recreate the atlas for the new, doubled size when all glyphs don't fit on the previous-sized atlas
// (but not on the first pass)
RL_FREE(atlas.data);
atlas.width = atlas.width*2; // Atlas bitmap width
atlas.height = atlas.height*2; // Atlas bitmap height
atlas.data = (unsigned char *)RL_CALLOC(1, atlas.width*atlas.height); // Create a bitmap to store characters (8 bpp)
TRACELOG(LOG_INFO, "FONT: Font atlas undersized, expanding atlas to %ix%i", atlas.width, atlas.height);
undersizedAtlasFlag = false;
}
// Fill chars rectangles in atlas info
recs[i].x = (float)offsetX;
recs[i].y = (float)offsetY;
recs[i].width = (float)chars[i].image.width;
recs[i].height = (float)chars[i].image.height;
int offsetX = padding;
int offsetY = padding;
// Move atlas position X for next character drawing
offsetX += (chars[i].image.width + 2*padding);
if (offsetX >= (atlas.width - chars[i].image.width - 2*padding))
// NOTE: Using simple packaging, one char after another
for (int i = 0; i < glyphCount; i++)
{
offsetX = padding;
// NOTE: Be careful on offsetY for SDF fonts, by default SDF
// use an internal padding of 4 pixels, it means char rectangle
// height is bigger than fontSize, it could be up to (fontSize + 8)
offsetY += (fontSize + 2*padding);
if (offsetY > (atlas.height - fontSize - padding))
// Copy pixel data from fc.data to atlas
for (int y = 0; y < chars[i].image.height; y++)
{
for(int j = i + 1; j < glyphCount; j++)
for (int x = 0; x < chars[i].image.width; x++)
{
TRACELOG(LOG_WARNING, "FONT: Failed to package character (%i)", j);
// make sure remaining recs contain valid data
recs[j].x = 0;
recs[j].y = 0;
recs[j].width = 0;
recs[j].height = 0;
((unsigned char *)atlas.data)[(offsetY + y)*atlas.width + (offsetX + x)] = ((unsigned char *)chars[i].image.data)[y*chars[i].image.width + x];
}
break;
}
// Fill chars rectangles in atlas info
recs[i].x = (float)offsetX;
recs[i].y = (float)offsetY;
recs[i].width = (float)chars[i].image.width;
recs[i].height = (float)chars[i].image.height;
// Move atlas position X for next character drawing
offsetX += (chars[i].image.width + 2*padding);
if (offsetX >= (atlas.width - chars[i].image.width - 2*padding))
{
offsetX = padding;
// NOTE: Be careful on offsetY for SDF fonts, by default SDF
// use an internal padding of 4 pixels, it means char rectangle
// height is bigger than fontSize, it could be up to (fontSize + 8)
offsetY += (fontSize + 2*padding);
if (offsetY > (atlas.height - fontSize - padding))
{
// The current atlas is too small to hold all glyphs, so move to the next atlas size
currentRepeatCount++;
undersizedAtlasFlag = true;
// If the process repeats more times than the defined limit, abort and log the unpackaged characters
for(int j = i + 1; j < glyphCount; j++)
{
if (currentRepeatCount > maxRepeatCount)
{
TRACELOG(LOG_WARNING, "FONT: Failed to package character (%i)", j);
}
// make sure remaining recs contain valid data
recs[j].x = 0;
recs[j].y = 0;
recs[j].width = 0;
recs[j].height = 0;
}
break;
}
}
}
// After any pass, if all the glyphs fit, immediately end the packing process
if (!undersizedAtlasFlag)
{
break;
}
}
}