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#ifndef MBGL_UTIL_JPEG_READER_HPP
#define MBGL_UTIL_JPEG_READER_HPP
#include <mbgl/platform/default/image_reader.hpp>
// jpeg
extern "C"
{
#include <jpeglib.h>
}
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wunknown-pragmas"
#pragma GCC diagnostic ignored "-Wunused-local-typedefs"
#pragma GCC diagnostic ignored "-Wshadow"
#include <boost/iostreams/stream.hpp>
#pragma GCC diagnostic pop
namespace mbgl { namespace util {
template <typename T>
class JpegReader : public ImageReader
{
public:
using source_type = T;
using input_stream = boost::iostreams::stream<source_type>;
const static unsigned BUF_SIZE = 4096;
private:
struct jpeg_stream_wrapper
{
jpeg_source_mgr manager;
input_stream * stream;
JOCTET buffer[BUF_SIZE];
};
struct jpeg_info_guard
{
jpeg_info_guard(jpeg_decompress_struct * cinfo)
: i_(cinfo) {}
~jpeg_info_guard()
{
jpeg_destroy_decompress(i_);
}
jpeg_decompress_struct * i_;
};
private:
source_type source_;
input_stream stream_;
unsigned width_;
unsigned height_;
public:
JpegReader(const uint8_t* data, size_t size);
~JpegReader();
unsigned width() const;
unsigned height() const;
std::unique_ptr<uint8_t[]> read();
private:
void init();
static void on_error(j_common_ptr cinfo);
static void on_error_message(j_common_ptr cinfo);
static void init_source(j_decompress_ptr cinfo);
static boolean fill_input_buffer(j_decompress_ptr cinfo);
static void skip(j_decompress_ptr cinfo, long count);
static void term(j_decompress_ptr cinfo);
static void attach_stream(j_decompress_ptr cinfo, input_stream* in);
};
}}
#endif // MBGL_UTIL_JPEG_READER_HPP
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