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#include <mbgl/renderer/image_atlas.hpp>
#include <mapbox/shelf-pack.hpp>
namespace mbgl {
static constexpr uint32_t padding = 1;
ImagePosition::ImagePosition(const mapbox::Bin& bin, const style::Image::Impl& image)
: pixelRatio(image.pixelRatio),
textureRect(
bin.x + padding,
bin.y + padding,
bin.w - padding * 2,
bin.h - padding * 2
) {
}
ImageAtlas makeImageAtlas(const ImageMap& images) {
ImageAtlas result;
mapbox::ShelfPack::ShelfPackOptions options;
options.autoResize = true;
mapbox::ShelfPack pack(0, 0, options);
std::vector<const style::Image::Impl*> pointers;
pointers.reserve(images.size());
std::vector<mapbox::Bin> bins;
bins.reserve(images.size());
for (const auto& entry : images) {
const style::Image::Impl& image = *entry.second;
pointers.emplace_back(&image);
bins.emplace_back(pointers.size() - 1,
image.image.size.width + 2 * padding,
image.image.size.height + 2 * padding);
}
mapbox::ShelfPack::PackOptions packOptions;
packOptions.inPlace = true;
pack.pack(bins, packOptions);
result.image = PremultipliedImage({
static_cast<uint32_t>(pack.width()),
static_cast<uint32_t>(pack.height())
});
for (const auto& bin : bins) {
const style::Image::Impl& image = *pointers.at(bin.id);
PremultipliedImage::copy(image.image,
result.image,
{ 0, 0 },
{
bin.x + padding,
bin.y + padding
},
image.image.size);
result.positions.emplace(image.id,
ImagePosition { bin, image });
}
return result;
}
} // namespace mbgl
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