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#include <mbgl/text/glyph_atlas.hpp>
#include <mapbox/shelf-pack.hpp>
namespace mbgl {
static constexpr uint32_t padding = 1;
GlyphAtlas makeGlyphAtlas(const Glyphs& glyphs) {
GlyphAtlas result;
mapbox::ShelfPack::ShelfPackOptions options;
options.autoResize = true;
mapbox::ShelfPack pack(0, 0, options);
std::vector<mapbox::Bin> bins;
bins.reserve(glyphs.size());
for (const auto& entry : glyphs) {
if (entry.second && (*entry.second)->bitmap.valid()) {
const Glyph& glyph = **entry.second;
bins.emplace_back(glyph.id,
glyph.bitmap.size.width + 2 * padding,
glyph.bitmap.size.height + 2 * padding);
}
}
mapbox::ShelfPack::PackOptions packOptions;
packOptions.inPlace = true;
pack.pack(bins, packOptions);
result.image = AlphaImage({
static_cast<uint32_t>(pack.width()),
static_cast<uint32_t>(pack.height())
});
for (const auto& bin : bins) {
const Glyph& glyph = **glyphs.at(bin.id);
AlphaImage::copy(glyph.bitmap,
result.image,
{ 0, 0 },
{
bin.x + padding,
bin.y + padding
},
glyph.bitmap.size);
result.positions.emplace(glyph.id,
GlyphPosition {
Rect<uint16_t> {
static_cast<uint16_t>(bin.x),
static_cast<uint16_t>(bin.y),
static_cast<uint16_t>(bin.w),
static_cast<uint16_t>(bin.h)
},
glyph.metrics
});
}
return result;
}
} // namespace mbgl
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