49 lines
1.7 KiB
C++
49 lines
1.7 KiB
C++
#include <mbgl/text/glyph_atlas.hpp>
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#include <mapbox/shelf-pack.hpp>
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namespace mbgl {
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static constexpr uint32_t padding = 1;
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GlyphAtlas makeGlyphAtlas(const GlyphMap& glyphs) {
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GlyphAtlas result;
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mapbox::ShelfPack::ShelfPackOptions options;
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options.autoResize = true;
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mapbox::ShelfPack pack(0, 0, options);
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for (const auto& glyphMapEntry : glyphs) {
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FontStackHash fontStack = glyphMapEntry.first;
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GlyphPositionMap& positions = result.positions[fontStack];
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for (const auto& entry : glyphMapEntry.second) {
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if (entry.second && (*entry.second)->bitmap.valid()) {
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const Glyph& glyph = **entry.second;
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const mapbox::Bin& bin = *pack.packOne(
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-1, glyph.bitmap.size.width + 2 * padding, glyph.bitmap.size.height + 2 * padding);
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result.image.resize({static_cast<uint32_t>(pack.width()), static_cast<uint32_t>(pack.height())});
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AlphaImage::copy(
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glyph.bitmap, result.image, {0, 0}, {bin.x + padding, bin.y + padding}, glyph.bitmap.size);
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positions.emplace(glyph.id,
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GlyphPosition{Rect<uint16_t>{static_cast<uint16_t>(bin.x),
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static_cast<uint16_t>(bin.y),
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static_cast<uint16_t>(bin.w),
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static_cast<uint16_t>(bin.h)},
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glyph.metrics});
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}
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}
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}
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pack.shrink();
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result.image.resize({static_cast<uint32_t>(pack.width()), static_cast<uint32_t>(pack.height())});
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return result;
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}
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} // namespace mbgl
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