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