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Fix packing logic error in ``GenImageFontAtlas`` (#2979)

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Basic packing algorithm currently follows this order: Copy pixel data -> Move offsetX for current glyph -> Check remaining space for current glyph...
Since X offset already moved according current glyph, remaining space should be checked for next glyph. Because of this, occasionally, current logic causes glyphs wrapping around texture.
Proposed fix accomplishes that by moving offsetX check to the beginning of the loop.
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Hanaxar 2023-03-22 13:00:13 +03:00 committed by GitHub
parent 02a8a49961
commit e55bdd5d8a
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 19 additions and 18 deletions
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37
src/rtext.c
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@ -725,24 +725,7 @@ Image GenImageFontAtlas(const GlyphInfo *chars, Rectangle **charRecs, int glyphC
// NOTE: Using simple packaging, one char after another
for (int i = 0; i < glyphCount; i++)
{
// Copy pixel data from fc.data to atlas
for (int y = 0; y < chars[i].image.height; y++)
{
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];
}
}
// 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);
// Check remaining space for glyph
if (offsetX >= (atlas.width - chars[i].image.width - 2*padding))
{
offsetX = padding;
@ -766,6 +749,24 @@ Image GenImageFontAtlas(const GlyphInfo *chars, Rectangle **charRecs, int glyphC
break;
}
}
// Copy pixel data from fc.data to atlas
for (int y = 0; y < chars[i].image.height; y++)
{
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];
}
}
// 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);
}
}
else if (packMethod == 1) // Use Skyline rect packing algorithm (stb_pack_rect)