XCopyImg.c File Reference

#include "getx11.h"

Include dependency graph for XCopyImg.c:

Go to the source code of this file.

Functions
int	XCopyImage (XImage *image, int src_x, int src_y, int width, int height, int dst_x, int dst_y)

Function Documentation

int XCopyImage	(	XImage *	image,
		int	src_x,
		int	src_y,
		int	width,
		int	height,
		int	dst_x,
		int	dst_y
	)

Definition at line 35 of file XCopyImg.c.

{
    int line_width = image->bytes_per_line;

    if ( width == 0 )
    return False;

    switch ( image->bits_per_pixel )
    {
    case 1:
    return False;

    case 8:
    do {
        char *srcline, *dstline;
        register char *src, *dst;
        register int counter;

        if ( src_y < dst_y )
        {
        srcline = image->data + line_width * (src_y+height-1) +
            src_x;
        dstline = image->data + line_width * (dst_y+height-1) +
            dst_x;

        if ( src_x < dst_x ) {
            dstline += width - 1;
            while ( --height >= 0 ) {
            src = srcline + width - 1;
            dst = dstline;
            counter = width;

            duff8( counter, *dst-- = *src-- );

            srcline -= line_width;
            dstline -= line_width;
            }
        }
        else {
            srcline += width - 1;
            while ( --height >= 0 ) {
            src = srcline - width + 1;
            dst = dstline;
            counter = width;

            duff8( counter, *dst++ = *src++ );

            srcline -= line_width;
            dstline -= line_width;
            }
        }
        }
        else
        {
        srcline = image->data + line_width * src_y + src_x;
        dstline = image->data + line_width * dst_y + dst_x;

        if ( src_x < dst_x ) {

            dstline += width - 1;
            while ( --height >= 0 ) {
            src = srcline + width - 1;
            dst = dstline;
            counter = width;

            duff8( counter, *dst-- = *src-- );

            srcline += line_width;
            dstline += line_width;
            }
        }
        else {
            srcline += width - 1;
            while ( --height >= 0 ) {
            src = srcline - width + 1;
            dst = dstline;
            counter = width;

            duff8( counter, *dst++ = *src++ );

            srcline += line_width;
            dstline += line_width;
            }
        }
        }
    } while (0);
    return True;

    case 32:
    do {
        register long *srcline, *dstline;
        register long *src, *dst;

        if ( src_y < dst_y )
        {
        srcline = (long *) ((char *)image->data +
                    line_width * (src_y+height-1) +
                    src_x * sizeof(long));
        dstline = (long *) ((char *)image->data +
                    line_width * (dst_y+height-1) +
                    dst_x * sizeof(long));

        if ( src_x < dst_x ) {

            dstline += width - 1;
            while ( --height >= 0 ) {
            src = srcline + width - 1;
            dst = dstline;

            while ( src >= srcline )
                *dst-- = *src--;

            srcline -= line_width/sizeof(long);
            dstline -= line_width/sizeof(long);
            }
        }
        else {
            srcline += width - 1;
            while ( --height >= 0 ) {
            src = srcline - width + 1;
            dst = dstline;

            while ( src <= srcline )
                *dst++ = *src++;

            srcline -= line_width/sizeof(long);
            dstline -= line_width/sizeof(long);
            }
        }
        }
        else
        {
        srcline = (long *) ((char *)image->data + line_width * src_y +
                    src_x * sizeof(long));
        dstline = (long *) ((char *)image->data + line_width * dst_y +
                    dst_x * sizeof(long));

        if ( src_x < dst_x ) {

            dstline += width - 1;
            while ( --height >= 0 ) {
            src = srcline + width - 1;
            dst = dstline;

            while ( src >= srcline )
                *dst-- = *src--;

            srcline += line_width/sizeof(long);
            dstline += line_width/sizeof(long);
            }
        }
        else {
            srcline += width - 1;
            while ( --height >= 0 ) {
            src = srcline - width + 1;
            dst = dstline;

            while ( src <= srcline )
                *dst++ = *src++;

            srcline += line_width/sizeof(long);
            dstline += line_width/sizeof(long);
            }
        }
        }
    } while (0);
    return True;
    }
    return False;
}