std::vector<std::unique_ptr<style::Image>> parseSprite(const std::string& encodedImage, const std::string& json) {
const PremultipliedImage raster = decodeImage(encodedImage);
JSDocument doc;
doc.Parse<0>(json.c_str());
if (doc.HasParseError()) {
std::stringstream message;
message << "Failed to parse JSON: " << rapidjson::GetParseError_En(doc.GetParseError()) << " at offset " << doc.GetErrorOffset();
throw std::runtime_error(message.str());
} else if (!doc.IsObject()) {
throw std::runtime_error("Sprite JSON root must be an object");
} else {
std::vector<std::unique_ptr<style::Image>> images;
for (const auto& property : doc.GetObject()) {
const std::string name = { property.name.GetString(), property.name.GetStringLength() };
const JSValue& value = property.value;
if (value.IsObject()) {
const uint16_t x = getUInt16(value, "x", 0);
const uint16_t y = getUInt16(value, "y", 0);
const uint16_t width = getUInt16(value, "width", 0);
const uint16_t height = getUInt16(value, "height", 0);
const double pixelRatio = getDouble(value, "pixelRatio", 1);
const bool sdf = getBoolean(value, "sdf", false);
auto image = createStyleImage(name, raster, x, y, width, height, pixelRatio, sdf);
if (image) {
images.push_back(std::move(image));
}
}
}
return images;
}
}
SpriteParseResult parseSprite(const std::string& image, const std::string& json) {
Sprites sprites;
PremultipliedImage raster;
try {
raster = decodeImage(image);
} catch (...) {
return std::current_exception();
}
JSDocument doc;
doc.Parse<0>(json.c_str());
if (doc.HasParseError()) {
std::stringstream message;
message << "Failed to parse JSON: " << rapidjson::GetParseError_En(doc.GetParseError()) << " at offset " << doc.GetErrorOffset();
return std::make_exception_ptr(std::runtime_error(message.str()));
} else if (!doc.IsObject()) {
return std::make_exception_ptr(std::runtime_error("Sprite JSON root must be an object"));
} else {
for (JSValue::ConstMemberIterator itr = doc.MemberBegin(); itr != doc.MemberEnd(); ++itr) {
const std::string name = { itr->name.GetString(), itr->name.GetStringLength() };
const JSValue& value = itr->value;
if (value.IsObject()) {
const uint16_t x = getUInt16(value, "x", 0);
const uint16_t y = getUInt16(value, "y", 0);
const uint16_t width = getUInt16(value, "width", 0);
const uint16_t height = getUInt16(value, "height", 0);
const double pixelRatio = getDouble(value, "pixelRatio", 1);
const bool sdf = getBoolean(value, "sdf", false);
auto sprite = createSpriteImage(raster, x, y, width, height, pixelRatio, sdf);
if (sprite) {
sprites.emplace(name, sprite);
}
}
}
}
return sprites;
}