diff options
Diffstat (limited to 'platform/default/src/mbgl/util/image.cpp')
-rw-r--r-- | platform/default/src/mbgl/util/image.cpp | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/platform/default/src/mbgl/util/image.cpp b/platform/default/src/mbgl/util/image.cpp new file mode 100644 index 0000000000..25063892b7 --- /dev/null +++ b/platform/default/src/mbgl/util/image.cpp @@ -0,0 +1,31 @@ +#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 = (data[0] << 24) | (data[1] << 16) | (data[2] << 8) | 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 |