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#include <mbgl/util/image.hpp>
#include <mbgl/util/string.hpp>
#include <mbgl/util/premultiply.hpp>
namespace mbgl {
PremultipliedImage decodePNG(const uint8_t*, size_t);
PremultipliedImage decodeJPEG(const uint8_t*, size_t);
PremultipliedImage decodeImage(const std::string& string) {
const auto* data = reinterpret_cast<const uint8_t*>(string.data());
const size_t size = string.size();
if (size >= 4) {
uint32_t magic = (static_cast<uint32_t>(data[0]) << 24) | (static_cast<uint32_t>(data[1]) << 16) |
(static_cast<uint32_t>(data[2]) << 8) | static_cast<uint32_t>(data[3]);
if (magic == 0x89504E47U) {
return decodePNG(data, size);
}
}
if (size >= 2) {
uint16_t magic = ((data[0] << 8) | data[1]) & 0xffff;
if (magic == 0xFFD8) {
return decodeJPEG(data, size);
}
}
throw std::runtime_error("unsupported image type");
}
} // namespace mbgl
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