I have two Images 1.Original image 2.mask image
I want to mask original image with mask image and it will done using below code.
- (UIImage *) maskImage:(UIImage *)originalImage : (NSString *)maskImageName
{
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
UIImage *maskImage = [UIImage imageNamed:maskImageName];
CGImageRef maskImageRef = [maskImage CGImage];
CGContextRef mainViewContentContext = CGBitmapContextCreate (NULL, maskImage.size.width, maskImage.size.height, 8, 0, colorSpace, kCGImageAlphaPremultipliedLast);//kCGImageAlphaPremultipliedLast
CGColorSpaceRelease(colorSpace);
if (mainViewContentContext == NULL)
{
return NULL;
}
CGFloat ratio = 0;
ratio = maskImage.size.width/ originalImage.size.width;
if(ratio * originalImage.size.height < maskImage.size.height)
{
ratio = maskImage.size.height/ originalImage.size.height;
}
CGRect rect1 = {{0, 0}, {maskImage.size.width, maskImage.size.height}};
CGRect rect2 = {{-((originalImage.size.width*ratio)-maskImage.size.width)/2 , -((originalImage.size.height*ratio)-maskImage.size.height)/2}, {originalImage.size.width*ratio, originalImage.size.height*ratio}};
CGContextClipToMask(mainViewContentContext, rect1, maskImageRef);//rect1
CGContextDrawImage(mainViewContentContext, rect2, originalImage.CGImage);//rect2
CGImageRef newImage = CGBitmapContextCreateImage(mainViewContentContext);
CGContextRelease(mainViewContentContext);
UIImage *theImage = [UIImage imageWithCGImage:newImage];
CGImageRelease(newImage);
CGImageRelease(maskImageRef);
CGColorSpaceRelease(colorSpace);
return theImage;
}
But when this method masking images than original image resize with mask shape
My requirement is
original image zoom,move,rotate using gesture
after than i want masking
and in masking original image not resize If (Modified or not modified) only put mask shape and other transparent portion crop.
want to mask only color portion from image other portion will be transparent so corp original image with only colored portion of mask image and other portion will be crop not and when original image zoom than that zoomed portion will be covered with mask not original image.
