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util/ckimage.C

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/*
2D flat image class:
This class represents a 2D raster image; a rectangular 2D
array of pixels.

Orion Sky Lawlor, olawlor@acm.org, 5/15/2002
*/
#include "ckimage.h"
#include <string.h>

/*
Zero out this image-- make it all black.
*/
void CkImage::clear(void) {
    for (int y=0;y<ht;y++)
        memset(&data[y*row],0,wid*colors);
}

    /*
     Copy all of src onto this image starting at (x,y).
     */
    void CkImage::put(int sx,int sy,const CkImage &src) {
        for (int y=0;y<src.ht;y++)
        for (int x=0;x<src.wid;x++)
            copyPixel(src.getPixel(x,y),getPixel(x+sx,y+sy));
    }
    
    /*
     Add all of src onto this image starting at (x,y).
     */
    void CkImage::add(int sx,int sy,const CkImage &src) {
        for (int y=0;y<src.ht;y++)
        for (int x=0;x<src.wid;x++)
            addPixel(src.getPixel(x,y),getPixel(x+sx,y+sy));
    }
    
    /*
     Add all of src onto this image starting at (x,y), clipping
         values instead of overflowing.
     */
    void CkImage::addClip(int sx,int sy,const CkImage &src,const channel_t *clip) {
        for (int y=0;y<src.ht;y++)
        for (int x=0;x<src.wid;x++)
            addPixelClip(src.getPixel(x,y),getPixel(x+sx,y+sy),clip);
    }
    
    /*
    Allocate clipping array for above routine.
    This array has 512 entries-- it's used to clip off large values
    when summing bytes (like image values) together.  On a machine with
    a small cache, it may be better to use an "if" instead of this table.
    */
    CkImage::channel_t *CkImage::newClip(void){
        const int tableLen=2*channel_max+1; //subtle: 2*channel_max is last valid index
        channel_t *ret=new channel_t[tableLen];
        int i;
        for (i=0;i<channel_max;i++) ret[i]=(channel_t)i;
        for (i=channel_max;i<tableLen;i++) ret[i]=(channel_t)channel_max;
        return ret;
    }

//Pup both image size as well as image data.
void CkAllocImage::pup(PUP::er &p) {
    CkImage::pup(p);
    if (p.isUnpacking()) allocate();
    int len=getRect().area()*getColors();
    p(allocData,len);
}

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