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#include <mbgl/renderer/image_atlas.hpp>
#include <mbgl/renderer/image_manager.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, uint32_t version_)
: pixelRatio(image.pixelRatio),
paddedRect(bin.x, bin.y, bin.w, bin.h),
version(version_),
stretchX(image.stretchX),
stretchY(image.stretchY),
content(image.content) {}
const mapbox::Bin& _packImage(mapbox::ShelfPack& pack, const style::Image::Impl& image, ImageAtlas& resultImage, ImageType imageType) {
const mapbox::Bin& bin = *pack.packOne(-1,
image.image.size.width + 2 * padding,
image.image.size.height + 2 * padding);
resultImage.image.resize({
static_cast<uint32_t>(pack.width()),
static_cast<uint32_t>(pack.height())
});
PremultipliedImage::copy(image.image,
resultImage.image,
{ 0, 0 },
{
bin.x + padding,
bin.y + padding
},
image.image.size);
uint32_t x = bin.x + padding;
uint32_t y = bin.y + padding;
uint32_t w = image.image.size.width;
uint32_t h = image.image.size.height;
if (imageType == ImageType::Pattern) {
// Add 1 pixel wrapped padding on each side of the image.
PremultipliedImage::copy(image.image, resultImage.image, { 0, h - 1 }, { x, y - 1 }, { w, 1 }); // T
PremultipliedImage::copy(image.image, resultImage.image, { 0, 0 }, { x, y + h }, { w, 1 }); // B
PremultipliedImage::copy(image.image, resultImage.image, { w - 1, 0 }, { x - 1, y }, { 1, h }); // L
PremultipliedImage::copy(image.image, resultImage.image, { 0, 0 }, { x + w, y }, { 1, h }); // R
}
return bin;
}
namespace {
void populateImagePatches(
ImagePositions& imagePositions,
const ImageManager& imageManager,
std::vector<ImagePatch>& /*out*/ patches) {
for (auto& updatedImageVersion : imageManager.updatedImageVersions) {
const std::string& name = updatedImageVersion.first;
const uint32_t version = updatedImageVersion.second;
auto it = imagePositions.find(updatedImageVersion.first);
if (it != imagePositions.end()) {
auto& position = it->second;
if (position.version == version) continue;
auto updatedImage = imageManager.getSharedImage(name);
if (updatedImage == nullptr) continue;
patches.emplace_back(*updatedImage, position.paddedRect);
position.version = version;
}
}
}
} // namespace
std::vector<ImagePatch> ImageAtlas::getImagePatchesAndUpdateVersions(const ImageManager& imageManager) {
std::vector<ImagePatch> imagePatches;
populateImagePatches(iconPositions, imageManager, imagePatches);
populateImagePatches(patternPositions, imageManager, imagePatches);
return imagePatches;
}
ImageAtlas makeImageAtlas(const ImageMap& icons, const ImageMap& patterns, const std::unordered_map<std::string, uint32_t>& versionMap) {
ImageAtlas result;
mapbox::ShelfPack::ShelfPackOptions options;
options.autoResize = true;
mapbox::ShelfPack pack(0, 0, options);
for (const auto& entry : icons) {
const style::Image::Impl& image = *entry.second;
const mapbox::Bin& bin = _packImage(pack, image, result, ImageType::Icon);
auto it = versionMap.find(entry.first);
auto version = it != versionMap.end() ? it->second : 0;
result.iconPositions.emplace(image.id, ImagePosition { bin, image, version });
}
for (const auto& entry : patterns) {
const style::Image::Impl& image = *entry.second;
const mapbox::Bin& bin = _packImage(pack, image, result, ImageType::Pattern);
auto it = versionMap.find(entry.first);
auto version = it != versionMap.end() ? it->second : 0;
result.patternPositions.emplace(image.id, ImagePosition { bin, image, version });
}
pack.shrink();
result.image.resize({
static_cast<uint32_t>(pack.width()),
static_cast<uint32_t>(pack.height())
});
return result;
}
} // namespace mbgl
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