#include "pixmap.h"

Pixelmap::Pixelmap(int w,int h,PixelFormat format,int align):
	width(w), height(h), format(format), align(align)
{
    stride=(this->width*PixelFormatBytesPerPixel(this->format)+(this->align-1))/this->align*this->align;
    capacity=this->stride*this->height;

    pixels=(char *)malloc(this->capacity);
    memset(pixels,0,this->capacity);
}

Pixelmap::~Pixelmap()
{
    free(pixels);
}

char *Pixelmap::PixPtr(unsigned int x,unsigned int y)
{
    return pixels+(y*stride+x*PixelFormatBytesPerPixel(format));
}

Pixelmap *Pixelmap::Copy()
{
    Pixelmap *newpixmap=new Pixelmap(width,height,format,align);

    for (register int y=0; y<(int)height; y++)
    {
        if (!PixelBufferCopy((unsigned char *)PixPtr(0,y),(unsigned char *)newpixmap->PixPtr(0,y),format,width))
        {
            delete newpixmap;
            return NULL;
        }
    }
    return newpixmap;
}

Pixelmap *Pixelmap::Convert(PixelFormat format)
{
    Pixelmap *newpixmap=new Pixelmap(width,height,format,align);

    for (register int y=0; y<(int)height; y++)
    {
        if (!PixelBufferConvert((unsigned char *)this->PixPtr(0,y),this->format,(unsigned char *)newpixmap->PixPtr(0,y),newpixmap->format,width))
        {
            delete newpixmap;
            return NULL;
        }
    }
    return newpixmap;
}

void Pixelmap::SwapChannels(int chan0,int chan1)
{
    for (register int y=0; y<(int)height; y++)
    {
        for (register int x=0; x<(int)width; x++)
		{
			char *pix=this->PixPtr(x,y);
			register char tmp;
			tmp=pix[chan0];
			pix[chan0]=pix[chan1];
			pix[chan1]=tmp;
		}
    }
}