Convert bitmap image information into CGImage in iPhone OS 3
- by giftederic
I want to create a CGImage with the color information I already have
Here is the code for converting the CGImage to CML, CML_color is a matrix structure
- (void)CGImageReftoCML:(CGImageRef *)image destination:(CML_color &)dest{
CML_RGBA p;
NSUInteger width=CGImageGetWidth(image);
NSUInteger height=CGImageGetHeight(image);
CGColorSpaceRef colorSpace=CGColorSpaceCreateDeviceRGB();
unsigned char *rawData=new unsigned char[height*width*4];
NSUInteger bytesPerPixel=4;
NSUInteger bytesPerRow=bytesPerPixel*width;
NSUInteger bitsPerComponent=8;
CGContextRef context=CGBitmapContextCreate(rawData, width, height, bitsPerComponent, bytesPerRow, colorSpace, kCGImageAlphaPremultipliedLast | kCGBitmapByteOrder32Big);
CGColorSpaceRelease(colorSpace);
CGContextDrawImage(context, CGRectMake(0, 0, width, height), image);
CGContextRelease(context);
int index=0;
for (int i=0; i<height; i++) {
for (int j=0; j<width; j++) {
p.red=rawData[index++];
p.green=rawData[index++];
p.blue=rawData[index++];
p.alpha=rawData[index++];
dest(i,j)=p;
}
}
delete[] rawData;
}
Now I want the reverse function, which converts CML into CGImage. I know all the color and alpha information to create the image, which stored in the matrix CML, but how can I do that?
