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UIImageManipulator actions

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UIImageManipulator.m
Objective-C
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#import "UIImageManipulator.h"
 
 
@implementation UIImageManipulator
 
static void addRoundedRectToPath(CGContextRef context, CGRect rect, float ovalWidth, float ovalHeight)
{
float fw, fh;
if (ovalWidth == 0 || ovalHeight == 0) {
CGContextAddRect(context, rect);
return;
}
CGContextSaveGState(context);
CGContextTranslateCTM(context, CGRectGetMinX(rect), CGRectGetMinY(rect));
CGContextScaleCTM(context, ovalWidth, ovalHeight);
fw = CGRectGetWidth(rect)/ovalWidth;
fh = CGRectGetHeight(rect)/ovalHeight;
CGContextMoveToPoint(context, fw, fh/2);
CGContextAddArcToPoint(context, fw, fh, fw/2, fh, 1);
CGContextAddArcToPoint(context, 0, fh, 0, fh/2, 1);
CGContextAddArcToPoint(context, 0, 0, fw/2, 0, 1);
CGContextAddArcToPoint(context, fw, 0, fw, fh/2, 1);
CGContextClosePath(context);
CGContextRestoreGState(context);
}
 
+(UIImage *)imageWithBorderFromImage:(UIImage *)source radiusWidth:(int)cornerWidth radiusHeight:(int)cornerHeight lineWidth:(int)lineWidth
{
CGSize size = [source size];
UIGraphicsBeginImageContext(size);
CGRect rect = CGRectMake(0, 0, size.width, size.height);
[source drawInRect:rect blendMode:kCGBlendModeNormal alpha:1.0];
CGContextRef context = UIGraphicsGetCurrentContext();
rect.size.width -= lineWidth;
rect.size.height -= lineWidth;
rect.origin.x += lineWidth / 2.0;
rect.origin.y += lineWidth / 2.0;
CGContextBeginPath(context);
addRoundedRectToPath(context, rect, cornerWidth, cornerHeight);
CGContextSetRGBStrokeColor(context, 0.0, 0.0, 0.0, 0.3);
CGContextSetLineWidth(context, 1);
CGContextStrokePath(context);
UIImage *theImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return theImage;
}
 
+(UIImage *)makeRoundCornerImage:(UIImage *)img:(int)cornerWidth:(int)cornerHeight withBorder:(BOOL)border
{
UIImage *newImage = nil;
if (nil != img) {
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
int w = img.size.width;
int h = img.size.height;
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
CGContextRef context = CGBitmapContextCreate(NULL, w, h, 8, 4*w, colorSpace, kCGImageAlphaPremultipliedFirst);
CGContextBeginPath(context);
CGRect rect = CGRectMake(0, 0, img.size.width, img.size.height);
addRoundedRectToPath(context, rect, cornerWidth, cornerHeight);
CGContextClosePath(context);
CGContextClip(context);
CGContextDrawImage(context, CGRectMake(0, 0, w, h), img.CGImage);
CGImageRef imageMasked = CGBitmapContextCreateImage(context);
CGContextRelease(context);
CGColorSpaceRelease(colorSpace);
[img release];
newImage = [[UIImage imageWithCGImage:imageMasked] retain];
CGImageRelease(imageMasked);
[pool release];
if (border)
newImage = [self imageWithBorderFromImage:newImage radiusWidth:cornerWidth radiusHeight:cornerHeight lineWidth:1];
}
return newImage;
 
}
 
+(UIImage *)scaleImage:(UIImage *)source toSize:(CGSize)size
{
UIImage *scaledImage = nil;
if (source != nil)
{
UIGraphicsBeginImageContext(size);
[source drawInRect:CGRectMake(0, 0, size.width, size.height)];
scaledImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
}
return scaledImage;
}
 
@end

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