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/* XPaint-image */
#include <Xpaint.h>
/*
* The key-word "ImageCreate" is reserved for user-defined image routines;
*
* Pixels are unsigned char arrays p[0]=red, p[1]=green, p[2]=blue
* (thus each value should be in the range 0..255)
*
* In the example below, ip = input pixel, op = output pixel
* The procedure below opens two images from files on the disk
* and creates a new image containing both.
*/
Image * ImageCreate()
{
Image *image[2], *input, *output;
unsigned char *ip, *ipp, *op;
int x, y, w, h, wp, hp, a;
/* Open files */
image[0] = ImageFromFile(ArchiveFile("file1.png"));
image[1] = ImageFromFile(ArchiveFile("XPaintIcon.xpm"));
a = 40;
w = image[0]->width;
h = image[0]->height;
wp = image[1]->width;
hp = image[1]->height;
output = ImageNew(w, h);
/* Merge image[0] and image[1], using image[1] as a translucent stamp */
for (y = 0; y < h; y++) {
for (x = 0; x < w; x++) {
ip = ImagePixel(image[0], x, y);
op = ImagePixel(output, x, y);
if (x < wp && y < hp) {
ipp = ImagePixel(image[0], x, y);
op[0] = (a*ip[0]+(100-a)*ipp[0])/100;
op[1] = (a*ip[1]+(100-a)*ipp[1])/100;
op[2] = (a*ip[2]+(100-a)*ipp[2])/100;
} else
memcpy(op, ip, 3);
}
}
/* Free images from memory since we are done with them */
ImageDelete(image[0]);
ImageDelete(image[1]);
return output;
}
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