109 lines
3.3 KiB
C++
109 lines
3.3 KiB
C++
#include <mbgl/renderer/pattern_atlas.hpp>
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#include <mbgl/gfx/upload_pass.hpp>
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#include <mbgl/gfx/context.hpp>
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namespace mbgl {
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namespace {
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// When copied into the atlas texture, image data is padded by one pixel on each side.
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// Pattern images are padded with a copy of the image data wrapped from the opposite side.
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// This ensures the correct behavior of GL_LINEAR texture sampling mode.
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const uint16_t padding = 1;
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mapbox::ShelfPack::ShelfPackOptions shelfPackOptions() {
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mapbox::ShelfPack::ShelfPackOptions options;
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options.autoResize = true;
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return options;
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}
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} // namespace
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PatternAtlas::PatternAtlas()
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: shelfPack(64, 64, shelfPackOptions()) {
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}
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PatternAtlas::~PatternAtlas() = default;
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optional<ImagePosition> PatternAtlas::getPattern(const std::string& id) const {
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auto it = patterns.find(id);
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if (it != patterns.end()) {
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return it->second.position;
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}
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return nullopt;
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}
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optional<ImagePosition> PatternAtlas::addPattern(const style::Image::Impl& image) {
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if (patterns.find(image.id) != patterns.end()) {
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return nullopt;
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}
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const uint16_t width = image.image.size.width + padding * 2;
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const uint16_t height = image.image.size.height + padding * 2;
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mapbox::Bin* bin = shelfPack.packOne(-1, width, height);
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if (!bin) {
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return nullopt;
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}
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atlasImage.resize(getPixelSize());
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const PremultipliedImage& src = image.image;
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const uint32_t x = bin->x + padding;
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const uint32_t y = bin->y + padding;
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const uint32_t w = src.size.width;
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const uint32_t h = src.size.height;
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PremultipliedImage::copy(src, atlasImage, { 0, 0 }, { x, y }, { w, h });
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// Add 1 pixel wrapped padding on each side of the image.
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PremultipliedImage::copy(src, atlasImage, { 0, h - 1 }, { x, y - 1 }, { w, 1 }); // T
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PremultipliedImage::copy(src, atlasImage, { 0, 0 }, { x, y + h }, { w, 1 }); // B
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PremultipliedImage::copy(src, atlasImage, { w - 1, 0 }, { x - 1, y }, { 1, h }); // L
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PremultipliedImage::copy(src, atlasImage, { 0, 0 }, { x + w, y }, { 1, h }); // R
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dirty = true;
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return patterns.emplace(image.id, Pattern { bin, { *bin, image } }).first->second.position;
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}
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void PatternAtlas::removePattern(const std::string& id) {
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auto it = patterns.find(id);
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if (it != patterns.end()) {
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// Clear pattern from the atlas image.
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const uint32_t x = it->second.bin->x;
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const uint32_t y = it->second.bin->y;
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const uint32_t w = it->second.bin->w;
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const uint32_t h = it->second.bin->h;
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PremultipliedImage::clear(atlasImage, { x, y }, { w, h });
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shelfPack.unref(*it->second.bin);
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patterns.erase(it);
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}
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}
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Size PatternAtlas::getPixelSize() const {
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return {
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static_cast<uint32_t>(shelfPack.width()),
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static_cast<uint32_t>(shelfPack.height())
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};
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}
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void PatternAtlas::upload(gfx::UploadPass& uploadPass) {
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if (!atlasTexture) {
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atlasTexture = uploadPass.createTexture(atlasImage);
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} else if (dirty) {
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uploadPass.updateTexture(*atlasTexture, atlasImage);
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}
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dirty = false;
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}
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gfx::TextureBinding PatternAtlas::textureBinding() const {
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assert(atlasTexture);
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assert(!dirty);
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return { atlasTexture->getResource(), gfx::TextureFilterType::Linear };
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}
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} // namespace mbgl
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