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Diffstat (limited to 'src/mbgl/renderer/image_manager.cpp')
-rw-r--r-- | src/mbgl/renderer/image_manager.cpp | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/src/mbgl/renderer/image_manager.cpp b/src/mbgl/renderer/image_manager.cpp new file mode 100644 index 0000000000..be47004b69 --- /dev/null +++ b/src/mbgl/renderer/image_manager.cpp @@ -0,0 +1,173 @@ +#include <mbgl/renderer/image_manager.hpp> +#include <mbgl/util/logging.hpp> +#include <mbgl/gl/context.hpp> + +namespace mbgl { + +void ImageManager::onSpriteLoaded() { + loaded = true; + for (const auto& entry : requestors) { + notify(*entry.first, entry.second); + } + requestors.clear(); +} + +void ImageManager::addImage(Immutable<style::Image::Impl> image_) { + assert(images.find(image_->id) == images.end()); + images.emplace(image_->id, std::move(image_)); +} + +void ImageManager::updateImage(Immutable<style::Image::Impl> image_) { + removeImage(image_->id); + addImage(std::move(image_)); +} + +void ImageManager::removeImage(const std::string& id) { + assert(images.find(id) != images.end()); + images.erase(id); + + auto it = patterns.find(id); + if (it != patterns.end()) { + shelfPack.unref(*it->second.bin); + patterns.erase(it); + } +} + +const style::Image::Impl* ImageManager::getImage(const std::string& id) const { + const auto it = images.find(id); + if (it != images.end()) { + return it->second.get(); + } + return nullptr; +} + +void ImageManager::getImages(ImageRequestor& requestor, ImageDependencies dependencies) { + // If the sprite has been loaded, or if all the icon dependencies are already present + // (i.e. if they've been addeded via runtime styling), then notify the requestor immediately. + // Otherwise, delay notification until the sprite is loaded. At that point, if any of the + // dependencies are still unavailable, we'll just assume they are permanently missing. + bool hasAllDependencies = true; + if (!isLoaded()) { + for (const auto& dependency : dependencies) { + if (images.find(dependency) == images.end()) { + hasAllDependencies = false; + } + } + } + if (isLoaded() || hasAllDependencies) { + notify(requestor, dependencies); + } else { + requestors.emplace(&requestor, std::move(dependencies)); + } +} + +void ImageManager::removeRequestor(ImageRequestor& requestor) { + requestors.erase(&requestor); +} + +void ImageManager::notify(ImageRequestor& requestor, const ImageDependencies& dependencies) const { + ImageMap response; + + for (const auto& dependency : dependencies) { + auto it = images.find(dependency); + if (it != images.end()) { + response.emplace(*it); + } + } + + requestor.onImagesAvailable(response); +} + +void ImageManager::dumpDebugLogs() const { + Log::Info(Event::General, "ImageManager::loaded: %d", loaded); +} + +// When copied into the atlas texture, image data is padded by one pixel on each side. Icon +// images are padded with fully transparent pixels, while pattern images are padded with a +// copy of the image data wrapped from the opposite side. In both cases, this ensures the +// correct behavior of GL_LINEAR texture sampling mode. +static constexpr uint16_t padding = 1; + +static mapbox::ShelfPack::ShelfPackOptions shelfPackOptions() { + mapbox::ShelfPack::ShelfPackOptions options; + options.autoResize = true; + return options; +} + +ImageManager::ImageManager() + : shelfPack(64, 64, shelfPackOptions()) { +} + +ImageManager::~ImageManager() = default; + +optional<ImagePosition> ImageManager::getPattern(const std::string& id) { + auto it = patterns.find(id); + if (it != patterns.end()) { + return it->second.position; + } + + const style::Image::Impl* image = getImage(id); + if (!image) { + return {}; + } + + const uint16_t width = image->image.size.width + padding * 2; + const uint16_t height = image->image.size.height + padding * 2; + + mapbox::Bin* bin = shelfPack.packOne(-1, width, height); + if (!bin) { + return {}; + } + + if (!atlasImage.valid()) { + atlasImage = PremultipliedImage(getPixelSize()); + atlasImage.fill(0); + } else if (atlasImage.size != getPixelSize()) { + PremultipliedImage newImage(getPixelSize()); + PremultipliedImage::copy(atlasImage, newImage, { 0, 0 }, { 0, 0 }, atlasImage.size); + atlasImage = std::move(newImage); + } + + const PremultipliedImage& src = image->image; + + const uint32_t x = bin->x + padding; + const uint32_t y = bin->y + padding; + const uint32_t w = src.size.width; + const uint32_t h = src.size.height; + + PremultipliedImage::copy(src, atlasImage, { 0, 0 }, { x, y }, { w, h }); + + // Add 1 pixel wrapped padding on each side of the image. + PremultipliedImage::copy(src, atlasImage, { 0, h - 1 }, { x, y - 1 }, { w, 1 }); // T + PremultipliedImage::copy(src, atlasImage, { 0, 0 }, { x, y + h }, { w, 1 }); // B + PremultipliedImage::copy(src, atlasImage, { w - 1, 0 }, { x - 1, y }, { 1, h }); // L + PremultipliedImage::copy(src, atlasImage, { 0, 0 }, { x + w, y }, { 1, h }); // R + + dirty = true; + + return patterns.emplace(id, Pattern { bin, { *bin, *image } }).first->second.position; +} + +Size ImageManager::getPixelSize() const { + return Size { + static_cast<uint32_t>(shelfPack.width()), + static_cast<uint32_t>(shelfPack.height()) + }; +} + +void ImageManager::upload(gl::Context& context, gl::TextureUnit unit) { + if (!atlasTexture) { + atlasTexture = context.createTexture(atlasImage, unit); + } else if (dirty) { + context.updateTexture(*atlasTexture, atlasImage, unit); + } + + dirty = false; +} + +void ImageManager::bind(gl::Context& context, gl::TextureUnit unit) { + upload(context, unit); + context.bindTexture(*atlasTexture, unit, gl::TextureFilter::Linear); +} + +} // namespace mbgl |