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Fix Font atlas expansion;

This commit is contained in:
bjorn 2022-06-26 21:22:45 -07:00
parent 9d84d3907b
commit e5d4ac10cb
1 changed files with 23 additions and 20 deletions
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43
src/modules/graphics/graphics.c
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@ -1776,22 +1776,22 @@ Font* lovrFontCreate(FontInfo* info) {
map_init(&font->glyphLookup, 36);
map_init(&font->kerning, 36);
font->pixelDensity = lovrRasterizerGetHeight(info->rasterizer);
font->lineSpacing = 1.f;
font->padding = (uint32_t) ceil(info->spread / 2.);
// Initial atlas size must be big enough to hold any of the glyphs
float box[4];
font->atlasWidth = 1;
font->atlasHeight = 1;
lovrRasterizerGetBoundingBox(info->rasterizer, box);
uint32_t width = (uint32_t) ceilf(box[2] - box[0]);
uint32_t height = (uint32_t) ceilf(box[3] - box[1]);
while (font->atlasWidth < 2 * width || font->atlasHeight < 2 * height) {
uint32_t maxWidth = (uint32_t) ceilf(box[2] - box[0]) + 2 * font->padding;
uint32_t maxHeight = (uint32_t) ceilf(box[3] - box[1]) + 2 * font->padding;
while (font->atlasWidth < 2 * maxWidth || font->atlasHeight < 2 * maxHeight) {
font->atlasWidth <<= 1;
font->atlasHeight <<= 1;
}
font->pixelDensity = lovrRasterizerGetHeight(info->rasterizer);
font->lineSpacing = 1.f;
font->padding = (uint32_t) ceil(info->spread / 2.);
return font;
}
@ -1853,21 +1853,24 @@ static Glyph* lovrFontGetGlyph(Font* font, uint32_t codepoint) {
uint32_t pixelWidth = 2 * font->padding + (uint32_t) ceilf(width);
uint32_t pixelHeight = 2 * font->padding + (uint32_t) ceilf(height);
// If the glyph exceeds the width, start a new row
if (font->atlasX + pixelWidth > font->atlasWidth) {
font->atlasX = font->atlasWidth == font->atlasHeight ? 0 : font->atlasWidth >> 1;
font->atlasY += font->rowHeight;
if (font->atlasY + pixelHeight > font->atlasHeight) {
if (font->atlasWidth == font->atlasHeight) {
font->atlasX = font->atlasWidth;
font->atlasY = 0;
font->atlasWidth <<= 1;
font->rowHeight = 0;
} else {
font->atlasX = 0;
font->atlasY = font->atlasHeight;
font->atlasHeight <<= 1;
font->rowHeight = 0;
}
}
// If the glyph exceeds the height, expand the atlas
if (font->atlasY + pixelHeight > font->atlasHeight) {
if (font->atlasWidth == font->atlasHeight) {
font->atlasX = font->atlasWidth;
font->atlasY = 0;
font->atlasWidth <<= 1;
font->rowHeight = 0;
} else {
font->atlasX = 0;
font->atlasY = font->atlasHeight;
font->atlasHeight <<= 1;
font->rowHeight = 0;
}
}
@ -1879,7 +1882,7 @@ static Glyph* lovrFontGetGlyph(Font* font, uint32_t codepoint) {
glyph->uv[3] = (uint16_t) ((float) (glyph->y + height) / font->atlasHeight * 65535.f + .5f);
font->atlasX += pixelWidth;
font->rowHeight = MAX(font->rowHeight, font->atlasY + pixelHeight);
font->rowHeight = MAX(font->rowHeight, pixelHeight);
return glyph;
}