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#ifndef MBGL_UTIL_PNG_READER_HPP
#define MBGL_UTIL_PNG_READER_HPP
#include <mbgl/platform/default/image_reader.hpp>
extern "C"
{
#include <png.h>
}
#include <cstring>
#include <memory>
#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 PngReader : public ImageReader
{
using source_type = T;
using input_stream = boost::iostreams::stream<source_type>;
struct png_struct_guard
{
png_struct_guard(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)
: p_(png_ptr_ptr),
i_(info_ptr_ptr) {}
~png_struct_guard()
{
png_destroy_read_struct(p_,i_,0);
}
png_structpp p_;
png_infopp i_;
};
private:
source_type source_;
input_stream stream_;
unsigned width_;
unsigned height_;
int bit_depth_;
int color_type_;
bool has_alpha_;
public:
PngReader(const uint8_t* data, std::size_t size);
~PngReader();
unsigned width() const;
unsigned height() const;
inline bool hasAlpha() const { return has_alpha_; }
bool premultipliedAlpha() const { return true; } // png_set_alpha_mode(png, PNG_ALPHA_PREMULTIPLIED, 2.2)
void read(unsigned x,unsigned y, unsigned width, unsigned height, uint8_t* image);
private:
void init();
static void png_read_data(png_structp png_ptr, png_bytep data, png_size_t length);
};
}}
#endif // MBGL_UTIL_PNG_READER_HPP
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