image_io.h

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#ifndef _IMAGE_IO_H
#define _IMAGE_IO_H
 
#ifdef GK_MACOS
#include <SDL2_image/SDL_surface.h>
#else
#include <SDL2/SDL_surface.h>
#endif
 
#include "image.h"
 
 
 
 
Image read_image( const char *filename );
 
int write_image( const Image& image, const char *filename );
 
Image flipY( const Image& image );
Image flipX( const Image& image );
 
Image copy( const Image& image, const int xmin, const int ymin, const int width, const int height );
 
 
struct ImageData
{
    ImageData( ) : pixels(), width(0), height(0), channels(0), size(0) {}
    ImageData( const int w, const int h, const int c, const int s= 1 ) : pixels(w*h*c*s, 0), width(w), height(h), channels(c), size(s) {}
    
    size_t offset( const int x, const int y, const int c= 0 ) const { return (y * width +x) * channels * size + c * size; }
    const void *data( ) const { return pixels.data(); }
    void *data( ) { return pixels.data(); }
    
    std::vector<unsigned char> pixels;
    
    int width;
    int height;
    int channels;
    int size;
};
 
ImageData image_data( SDL_Surface *surface );
 
ImageData read_image_data( const char *filename );
 
int write_image_data( ImageData& image, const char *filename );
 
ImageData flipY( const ImageData& image );
ImageData flipX( const ImageData& image );
 
ImageData copy( const ImageData& image, const int xmin, const int ymin, const int width, const int height );
 
ImageData downscale( const ImageData& image );
 
Image downscale( const Image& image );
 
 
#endif