project_files/HedgewarsMobile/Classes/otherSrc/UIImageExtra.m
author koda
Thu, 17 Jun 2010 20:30:39 +0200
changeset 3514 59dbd31e9953
parent 3492 cocoaTouch/otherSrc/UIImageExtra.m@07256e1ad559
child 3523 6592fbb969da
permissions -rw-r--r--
move stuff around and update iphone project
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//
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//  UIImageExtra.m
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//  HedgewarsMobile
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//
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//  Created by Vittorio on 08/04/10.
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//  Copyright 2010 __MyCompanyName__. All rights reserved.
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//
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#import "UIImageExtra.h"
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@implementation UIImage (extra)
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-(UIImage *)scaleToSize:(CGSize) size {
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  // Create a bitmap graphics context
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  // This will also set it as the current context
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  UIGraphicsBeginImageContext(size);
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  // Draw the scaled image in the current context
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  [self drawInRect:CGRectMake(0, 0, size.width, size.height)];
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  // Create a new image from current context
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  UIImage* scaledImage = UIGraphicsGetImageFromCurrentImageContext();
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  // Pop the current context from the stack
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  UIGraphicsEndImageContext();
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  // Return our new scaled image (autoreleased)
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  return scaledImage;
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}
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-(UIImage *)mergeWith:(UIImage *)secondImage atPoint:(CGPoint) secondImagePoint {
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    // create a contex of size of the background image
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    return [self mergeWith:secondImage atPoint:secondImagePoint atSize:self.size];
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}
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-(UIImage *)mergeWith:(UIImage *)secondImage atPoint:(CGPoint) secondImagePoint atSize:(CGSize) resultingSize {
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    UIGraphicsBeginImageContext(resultingSize);
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    // drav the background image
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    [self drawAtPoint:CGPointMake(0,0)];
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    // draw the image on top of the first image
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    [secondImage drawAtPoint:secondImagePoint];
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    // create an image from the current contex (not thread safe)
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    UIImage *resultImage = UIGraphicsGetImageFromCurrentImageContext();
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    // free drawing contex
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    UIGraphicsEndImageContext();
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    // return the resulting autoreleased image
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    return resultImage;
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}
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-(id) initWithContentsOfFile:(NSString *)path andCutAt:(CGRect) rect {
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    // load image from path
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    UIImage *image = [[UIImage alloc] initWithContentsOfFile: path];
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    if (nil != image) {
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        // get its CGImage representation with a give size
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        CGImageRef cgImgage = CGImageCreateWithImageInRect([image CGImage], rect);
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        // clean memory
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        [image release];
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        // create a UIImage from the CGImage (memory must be allocated already)
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        UIImage *sprite = [self initWithCGImage:cgImgage];
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        // clean memory
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        CGImageRelease(cgImgage);
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        // return resulting image
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        return sprite;
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    } else {
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        NSLog(@"initWithContentsOfFile: andCutAt: FAILED");
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        return nil;
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    }
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}
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-(UIImage *)convertToGrayScale {
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  // Create image rectangle with current image width/height
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  CGRect imageRect = CGRectMake(0, 0, self.size.width, self.size.height);
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  // Grayscale color space
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  CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceGray();
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  // Create bitmap content with current image size and grayscale colorspace
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  CGContextRef context = CGBitmapContextCreate(nil, self.size.width, self.size.height, 8, 0, colorSpace, kCGImageAlphaNone);
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  // Draw image into current context, with specified rectangle
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  // using previously defined context (with grayscale colorspace)
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  CGContextDrawImage(context, imageRect, [self CGImage]);
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  // Create bitmap image info from pixel data in current context
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  CGImageRef imageRef = CGBitmapContextCreateImage(context);
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  // Create a new UIImage object  
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  UIImage *newImage = [UIImage imageWithCGImage:imageRef];
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  // Release colorspace, context and bitmap information
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  CGColorSpaceRelease(colorSpace);
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  CGContextRelease(context);
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  CFRelease(imageRef);
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  // Return the new grayscale image
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  return newImage;
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}
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// by http://iphonedevelopertips.com/cocoa/how-to-mask-an-image.html turned into a category by koda
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-(UIImage*) maskImageWith:(UIImage *)maskImage {
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    CGImageRef maskRef = maskImage.CGImage;
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    CGImageRef mask = CGImageMaskCreate(CGImageGetWidth(maskRef),
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                                        CGImageGetHeight(maskRef),
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                                        CGImageGetBitsPerComponent(maskRef),
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                                        CGImageGetBitsPerPixel(maskRef),
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                                        CGImageGetBytesPerRow(maskRef),
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                                        CGImageGetDataProvider(maskRef), NULL, false);
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    CGImageRef masked = CGImageCreateWithMask([self CGImage], mask);
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    CGImageRelease(mask);
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    UIImage* retImage = [UIImage imageWithCGImage:masked];
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    CGImageRelease(masked);
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    return retImage;
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}
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// by http://blog.sallarp.com/iphone-uiimage-round-corners/ turned into a category by koda
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void addRoundedRectToPath(CGContextRef context, CGRect rect, float ovalWidth, float ovalHeight)
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{
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    float fw, fh;
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    if (ovalWidth == 0 || ovalHeight == 0) {
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        CGContextAddRect(context, rect);
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        return;
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    }
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    CGContextSaveGState(context);
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    CGContextTranslateCTM (context, CGRectGetMinX(rect), CGRectGetMinY(rect));
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    CGContextScaleCTM (context, ovalWidth, ovalHeight);
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    fw = CGRectGetWidth (rect) / ovalWidth;
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    fh = CGRectGetHeight (rect) / ovalHeight;
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    CGContextMoveToPoint(context, fw, fh/2);
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    CGContextAddArcToPoint(context, fw, fh, fw/2, fh, 1);
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    CGContextAddArcToPoint(context, 0, fh, 0, fh/2, 1);
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    CGContextAddArcToPoint(context, 0, 0, fw/2, 0, 1);
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    CGContextAddArcToPoint(context, fw, 0, fw, fh/2, 1);
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    CGContextClosePath(context);
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    CGContextRestoreGState(context);
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}
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-(UIImage *)makeRoundCornersOfSize:(CGSize) sizewh {
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	UIImage * newImage = nil;
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    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
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    NSInteger cornerWidth = sizewh.width;
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    NSInteger cornerHeight = sizewh.height;
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    int w = self.size.width;
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    int h = self.size.height;
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    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
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    CGContextRef context = CGBitmapContextCreate(NULL, w, h, 8, 4 * w, colorSpace, kCGImageAlphaPremultipliedFirst);
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    CGContextBeginPath(context);
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    CGRect rect = CGRectMake(0, 0, w, h);
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    addRoundedRectToPath(context, rect, cornerWidth, cornerHeight);
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    CGContextClosePath(context);
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    CGContextClip(context);
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    CGContextDrawImage(context, CGRectMake(0, 0, w, h), self.CGImage);
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    CGImageRef imageMasked = CGBitmapContextCreateImage(context);
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    CGContextRelease(context);
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    CGColorSpaceRelease(colorSpace);
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    [self release];
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    newImage = [[UIImage imageWithCGImage:imageMasked] retain];
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    CGImageRelease(imageMasked);
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    [pool release];
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    return newImage;
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}
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3352
ac5d14a35482 complete previews on the team settings
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@end