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#include <iostream>
#include <string.h>
#include "rotatepixbuf.h"
#include "maskpixbuf.h"
using namespace std;
#define OFFSET(pb, x, y) ((x) * (gdk_pixbuf_get_n_channels(pb)) + (y) * gdk_pixbuf_get_rowstride(pb))
void maskpixbuf(GdkPixbuf *img,int xpos,int ypos,int width,int height,const GdkPixbuf *mask,
int redbg8,int greenbg8,int bluebg8)
{
int bpp=gdk_pixbuf_get_n_channels(img);
if(bpp==1)
redbg8=(redbg8+greenbg8+bluebg8)/3;
if(bpp>4)
throw "maskpixbuf: More than 4 samples per pixel not supported!";
int background[4];
background[0]=redbg8;
background[1]=greenbg8;
background[2]=bluebg8;
background[3]=255;
GdkPixbuf *scaledmask;
if((width<height)^(gdk_pixbuf_get_width(mask)<gdk_pixbuf_get_height(mask)))
{
GdkPixbuf *tmp=gdk_pixbuf_rotate_simple(mask,GDK_PIXBUF_ROTATE_COUNTERCLOCKWISE);
scaledmask=gdk_pixbuf_scale_simple(tmp,width,height,GDK_INTERP_NEAREST);
g_object_unref(G_OBJECT(tmp));
}
else
scaledmask=gdk_pixbuf_scale_simple(mask,width,height,GDK_INTERP_NEAREST);
switch(gdk_pixbuf_get_n_channels(scaledmask))
{
case 1:
cerr << "8 bit mask" << endl;
for(int y=0;y<height;++y)
{
guchar *src=gdk_pixbuf_get_pixels(img)+gdk_pixbuf_get_rowstride(img)*(y+ypos);
guchar *mask=gdk_pixbuf_get_pixels(scaledmask)+gdk_pixbuf_get_rowstride(scaledmask)*y;
for(int x=0;x<width;++x)
{
int sx=x+xpos;
guchar m=mask[x];
for(int s=0;s<bpp;++s)
{
int p=src[sx*bpp+s];
p=((p*m)+(background[s]*(255-m)))/255;
src[sx*bpp+s]=p;
}
}
}
break;
case 3:
for(int y=0;y<height;++y)
{
guchar *src=gdk_pixbuf_get_pixels(img)+gdk_pixbuf_get_rowstride(img)*(y+ypos);
guchar *mask=gdk_pixbuf_get_pixels(scaledmask)+gdk_pixbuf_get_rowstride(scaledmask)*y;
for(int x=0;x<width;++x)
{
int sx=x+xpos;
guchar m=(mask[x*3]+mask[x*3+1]+mask[x*3+2])/3;
for(int s=0;s<bpp;++s)
{
int p=src[sx*bpp+s];
p=((p*m)+(background[s]*(255-m)))/255;
src[sx*bpp+s]=p;
}
}
}
break;
case 4:
for(int y=0;y<height;++y)
{
guchar *src=gdk_pixbuf_get_pixels(img)+gdk_pixbuf_get_rowstride(img)*(y+ypos);
guchar *mask=gdk_pixbuf_get_pixels(scaledmask)+gdk_pixbuf_get_rowstride(scaledmask)*y;
for(int x=0;x<width;++x)
{
int sx=x+xpos;
guchar m=(mask[x*4]+mask[x*4+1]+mask[x*4+2])/3;
for(int s=0;s<bpp;++s)
{
int p=src[sx*bpp+s];
p=((p*m)+(background[s]*(255-m)))/255;
src[sx*bpp+s]=p;
}
}
}
break;
}
g_object_unref(G_OBJECT(scaledmask));
}
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