project_files/HedgewarsMobile/Classes/UIImageExtra.m
author koda
Sat, 24 Sep 2011 22:27:52 +0200
changeset 6018 3b86826f6665
parent 5503 d8632f589008
child 6078 8c0cc07731e5
permissions -rw-r--r--
add a class method for getting the overlay (and fix a silly mistake while at it) and use it
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/*
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 * Hedgewars-iOS, a Hedgewars port for iOS devices
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 * Copyright (c) 2009-2011 Vittorio Giovara <vittorio.giovara@gmail.com>
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 *
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 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation; version 2 of the License
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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 *
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 * File created on 08/04/2010.
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 */
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#import "UIImageExtra.h"
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@implementation UIImage (extra)
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CGFloat getScreenScale(void) {
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    float scale = 1.0f;
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    if ([[UIScreen mainScreen] respondsToSelector:@selector(scale)])
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        scale = [[UIScreen mainScreen] scale];
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    return scale;
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}
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-(UIImage *)scaleToSize:(CGSize) size {
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    DLog(@"warning - this is a very expensive operation, you should avoid using it");
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    // Create a bitmap graphics context; this will also set it as the current context
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    if (UIGraphicsBeginImageContextWithOptions != NULL)
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        UIGraphicsBeginImageContextWithOptions(size, NO, getScreenScale());
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    else
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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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    if (secondImage == nil) {
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        DLog(@"Warning, secondImage == nil");
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        return self;
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    }
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    CGFloat screenScale = getScreenScale();
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    int w = self.size.width * screenScale;
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    int h = self.size.height * screenScale;
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    if (w == 0 || h == 0) {
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        DLog(@"Can have 0 dimesions");
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        return self;
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    }
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    // Create a bitmap graphics context; this will also set it as the current context
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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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    // draw the two images in the current context
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    CGContextDrawImage(context, CGRectMake(0, 0, self.size.width*screenScale, self.size.height*screenScale), [self CGImage]);
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    CGContextDrawImage(context, CGRectMake(secondImagePoint.x*screenScale, secondImagePoint.y*screenScale, secondImage.size.width*screenScale, secondImage.size.height*screenScale), [secondImage 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 *resultImage;
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    if ([self respondsToSelector:@selector(imageWithCGImage:scale:orientation:)])
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        resultImage = [UIImage imageWithCGImage:imageRef scale:screenScale orientation:UIImageOrientationUp];
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    else
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        resultImage = [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 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 cgImage = 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:cgImage];
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        // clean memory
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        CGImageRelease(cgImage);
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        // return resulting image
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        return sprite;
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    } else {
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        DLog(@"error - image == nil");
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        return nil;
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    }
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}
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-(UIImage *)cutAt:(CGRect) rect {
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    CGImageRef cgImage = CGImageCreateWithImageInRect([self CGImage], rect);
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    UIImage *res = [UIImage imageWithCGImage:cgImage];
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    CGImageRelease(cgImage);
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    return res;
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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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    CFRelease(imageRef);
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    CGContextRelease(context);
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    CGColorSpaceRelease(colorSpace);
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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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    // prepare the reference image
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    CGImageRef maskRef = [maskImage CGImage];
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    // create the mask using parameters of the mask reference
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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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    // create an image in the current context
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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, CGFloat ovalWidth, CGFloat ovalHeight) {
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    CGFloat 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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    CGFloat cornerWidth = sizewh.width;
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    CGFloat cornerHeight = sizewh.height;
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    CGFloat screenScale = getScreenScale();
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    CGFloat w = self.size.width * screenScale;
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    CGFloat h = self.size.height * screenScale;
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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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    UIImage *newImage;
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    if ([self respondsToSelector:@selector(imageWithCGImage:scale:orientation:)])
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        newImage = [UIImage imageWithCGImage:imageMasked scale:screenScale orientation:UIImageOrientationUp];
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    else
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        newImage = [UIImage imageWithCGImage:imageMasked];
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    CGImageRelease(imageMasked);
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    return newImage;
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}
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// by http://www.sixtemia.com/journal/2010/06/23/uiimage-negative-color-effect/
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-(UIImage *)convertToNegative {
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    UIGraphicsBeginImageContext(self.size);
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    CGContextSetBlendMode(UIGraphicsGetCurrentContext(), kCGBlendModeCopy);
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    [self drawInRect:CGRectMake(0, 0, self.size.width, self.size.height)];
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    CGContextSetBlendMode(UIGraphicsGetCurrentContext(), kCGBlendModeDifference);
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    CGContextSetFillColorWithColor(UIGraphicsGetCurrentContext(),[UIColor whiteColor].CGColor);
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    CGContextFillRect(UIGraphicsGetCurrentContext(), CGRectMake(0, 0, self.size.width, self.size.height));
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    // create an image from the current contex (not thread safe)
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    UIImage *result = UIGraphicsGetImageFromCurrentImageContext();
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    UIGraphicsEndImageContext();
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    return result;
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}
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+(UIImage *)whiteImage:(CGSize) ofSize {
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    CGFloat w = ofSize.width;
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    CGFloat h = ofSize.height;
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    DLog(@"w: %f, h: %f", w, h);
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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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    CGContextSetRGBFillColor(context, 1.0, 1.0, 1.0, 1.0);
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    CGContextFillRect(context,CGRectMake(0,0,ofSize.width,ofSize.height));
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    CGImageRef image = CGBitmapContextCreateImage(context);
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    CGContextRelease(context);
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    CGColorSpaceRelease(colorSpace);
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    UIImage *bkgImg = [UIImage imageWithCGImage:image];
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    CGImageRelease(image);
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    return bkgImg;
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}
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@end