#ifndef PIXMAP_H
#define PIXMAP_H

#include "common.h"
#include "pixelbuffer.h"

// supported pixel formats
enum PixelFormat
{
	PixelsNone=-1,
    PixelsR8G8B8A8=PF_R8G8B8A8,
    PixelsB8G8R8A8=PF_B8G8R8A8,
    PixelsR8G8B8=PF_R8G8B8,
    PixelsB8G8R8=PF_B8G8R8,
    PixelsI8=PF_I8,
    PixelsA8=PF_A8
};

// Pixmap class.  I had to call it Pixelmap so it doesn't conflict with X11's Pixmap.
class Pixelmap
{
private:
    char *pixels;                   // Pixel buffer.
	int width,height,stride;     // Dimensions of the image, and buffer stride/pitch.
	int capacity,align;          // Memory capacity and alignment.
	PixelFormat format;             // Format enum.
public:
	// Pixel format information
	static unsigned int PixelFormatBytesPerPixel(PixelFormat format) {return ::PixelFormatBytesPerPixel((int)format);}
	static unsigned int PixelFormatColorBitsPerPixel(PixelFormat format) {return ::PixelFormatColorBitsPerPixel((int)format);}
	static unsigned int PixelFormatRed(PixelFormat format) {return ::PixelFormatRed((int)format);}
	static unsigned int PixelFormatGreen(PixelFormat format) {return ::PixelFormatGreen((int)format);}
	static unsigned int PixelFormatBlue(PixelFormat format) {return ::PixelFormatBlue((int)format);}
	static unsigned int PixelFormatAlpha(PixelFormat format) {return ::PixelFormatAlpha((int)format);}
	static unsigned int PixelFormatIntensity(PixelFormat format) {return ::PixelFormatIntensity((int)format);}

    Pixelmap(int w,int h,PixelFormat format=PixelsR8G8B8,int align=4);
    ~Pixelmap();

	// get various metrics
	int Width() {return width;}
	int Height() {return height;}
	int Stride() {return stride;} // the stride may also be known to you as the pitch
	PixelFormat Format() {return format;}

	// get a pointer to a specific pixel
    char *PixPtr(unsigned int x=0,unsigned int y=0);

	// create a copy, either in the same or a different format.
    Pixelmap *Copy();
    Pixelmap *Convert(PixelFormat format);

	// swap a pair of color channels, often necessary for resolving endian issues or Direct3D issues
	void SwapChannels(int chan0,int chan1);

	static void PixelRed(PixelFormat format,char *pixel,void *red)
	{
		switch (format)
		{
		case PixelsR8G8B8A8:
		case PixelsR8G8B8:
			(*(char *)red)=pixel[0];
			break;
		case PixelsB8G8R8A8:
		case PixelsB8G8R8:
			(*(char *)red)=pixel[2];
		default:
			(*(char *)red)=0;
			break;
		}
	}
	static void PixelGreen(PixelFormat format,char *pixel,void *green)
	{
		(*(char *)green)=((int)format<PF_I8)?pixel[1]:0;
	}
	static void PixelBlue(PixelFormat format,char *pixel,void *blue)
	{
		switch (format)
		{
		case PixelsR8G8B8A8:
		case PixelsR8G8B8:
			(*(char *)blue)=pixel[2];
			break;
		case PixelsB8G8R8A8:
		case PixelsB8G8R8:
			(*(char *)blue)=pixel[0];
		default:
			(*(char *)blue)=0;
			break;
		}
	}
	static void PixelAlpha(PixelFormat format,char *pixel,void *alpha)
	{
		switch (format)
		{
		case PixelsR8G8B8A8:
		case PixelsB8G8R8A8:
			(*(char *)alpha)=pixel[3];
			break;
		case PixelsA8:
			(*(char *)alpha)=pixel[0];
			break;
		default:
			(*(char *)alpha)=0;
			break;
		}
	}
};

#endif