/*

 * Hedgewars-iOS, a Hedgewars port for iOS devices

 * Copyright (c) 2009-2011 Vittorio Giovara <vittorio.giovara@gmail.com>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; version 2 of the License

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

 *

 * File created on 08/04/2010.

 */

#import "UIImageExtra.h"

@implementation UIImage (extra)

-(UIImage *)scaleToSize:(CGSize) size {

    DLog(@"warning - this is a very expensive operation, you should avoid using it");

    // Create a bitmap graphics context; this will also set it as the current context

    UIGraphicsBeginImageContextWithOptions(size, NO, [[UIScreen mainScreen] scale]);

    // Draw the scaled image in the current context

    [self drawInRect:CGRectMake(0, 0, size.width, size.height)];

    // Create a new image from current context

    UIImage* scaledImage = UIGraphicsGetImageFromCurrentImageContext();

    // Pop the current context from the stack

    UIGraphicsEndImageContext();

    // Return our new scaled image (autoreleased)

    return scaledImage;

}

-(UIImage *)mergeWith:(UIImage *)secondImage atPoint:(CGPoint) secondImagePoint {

    if (secondImage == nil) {

        DLog(@"Warning, secondImage == nil");

        return self;

    }

    CGFloat screenScale = [[UIScreen mainScreen] scale];

    int w = self.size.width * screenScale;

    int h = self.size.height * screenScale;

    if (w == 0 || h == 0) {

        return self;

    }

    // Create a bitmap graphics context; this will also set it as the current context

    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();

    // draw the two images in the current context

    CGContextDrawImage(context, CGRectMake(0, 0, self.size.width*screenScale, self.size.height*screenScale), [self CGImage]);

    CGContextDrawImage(context, CGRectMake(secondImagePoint.x*screenScale, secondImagePoint.y*screenScale, secondImage.size.width*screenScale, secondImage.size.height*screenScale), [secondImage CGImage]);

    // Create bitmap image info from pixel data in current context

    CGImageRef imageRef = CGBitmapContextCreateImage(context);

    // Create a new UIImage object

    UIImage *resultImage = [UIImage imageWithCGImage:imageRef scale:screenScale orientation:UIImageOrientationUp];

    // Release colorspace, context and bitmap information

    CGColorSpaceRelease(colorSpace);

    CGContextRelease(context);

    CFRelease(imageRef);

    return resultImage;

}

-(id) initWithContentsOfFile:(NSString *)path andCutAt:(CGRect) rect {

    // load image from path

    UIImage *image = [[UIImage alloc] initWithContentsOfFile: path];

    if (nil != image) {

        // get its CGImage representation with a give size

        CGImageRef cgImage = CGImageCreateWithImageInRect([image CGImage], rect);

        // clean memory

        [image release];

        // create a UIImage from the CGImage (memory must be allocated already)

        UIImage *sprite = [self initWithCGImage:cgImage];

        // clean memory

        CGImageRelease(cgImage);

        // return resulting image

        return sprite;

    } else {

        DLog(@"error - image == nil");

        return nil;

    }

}

-(UIImage *)cutAt:(CGRect) rect {

    CGImageRef cgImage = CGImageCreateWithImageInRect([self CGImage], rect);

    UIImage *res = [UIImage imageWithCGImage:cgImage];

    CGImageRelease(cgImage);

    return res;

}

-(UIImage *)convertToGrayScale {

    // Create image rectangle with current image width/height

    CGRect imageRect = CGRectMake(0, 0, self.size.width, self.size.height);

    // Grayscale color space

    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceGray();

    // Create bitmap content with current image size and grayscale colorspace

    CGContextRef context = CGBitmapContextCreate(nil, self.size.width, self.size.height, 8, 0, colorSpace, kCGImageAlphaNone);

    // Draw image into current context, with specified rectangle

    // using previously defined context (with grayscale colorspace)

    CGContextDrawImage(context, imageRect, [self CGImage]);

    // Create bitmap image info from pixel data in current context

    CGImageRef imageRef = CGBitmapContextCreateImage(context);

    // Create a new UIImage object

    UIImage *newImage = [UIImage imageWithCGImage:imageRef];

    // Release colorspace, context and bitmap information

    CFRelease(imageRef);

    CGContextRelease(context);

    CGColorSpaceRelease(colorSpace);

    // Return the new grayscale image

    return newImage;

}

// by http://iphonedevelopertips.com/cocoa/how-to-mask-an-image.html turned into a category by koda

-(UIImage*) maskImageWith:(UIImage *)maskImage {

    // prepare the reference image

    CGImageRef maskRef = [maskImage CGImage];

    // create the mask using parameters of the mask reference

    CGImageRef mask = CGImageMaskCreate(CGImageGetWidth(maskRef),

                                        CGImageGetHeight(maskRef),

                                        CGImageGetBitsPerComponent(maskRef),

                                        CGImageGetBitsPerPixel(maskRef),

                                        CGImageGetBytesPerRow(maskRef),

                                        CGImageGetDataProvider(maskRef), NULL, false);

    // create an image in the current context

    CGImageRef masked = CGImageCreateWithMask([self CGImage], mask);

    CGImageRelease(mask);

    UIImage* retImage = [UIImage imageWithCGImage:masked];

    CGImageRelease(masked);

    return retImage;

}

// by http://blog.sallarp.com/iphone-uiimage-round-corners/ turned into a category by koda

void addRoundedRectToPath(CGContextRef context, CGRect rect, CGFloat ovalWidth, CGFloat ovalHeight) {

    CGFloat 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 *)makeRoundCornersOfSize:(CGSize) sizewh {

    CGFloat cornerWidth = sizewh.width;

    CGFloat cornerHeight = sizewh.height;

    CGFloat screenScale = [[UIScreen mainScreen] scale];

    CGFloat w = self.size.width * screenScale;

    CGFloat h = self.size.height * screenScale;

    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();

    CGContextRef context = CGBitmapContextCreate(NULL, w, h, 8, 4 * w, colorSpace, kCGImageAlphaPremultipliedFirst);

    CGContextBeginPath(context);

    CGRect rect = CGRectMake(0, 0, w, h);

    addRoundedRectToPath(context, rect, cornerWidth, cornerHeight);

    CGContextClosePath(context);

    CGContextClip(context);

    CGContextDrawImage(context, CGRectMake(0, 0, w, h), [self CGImage]);

    CGImageRef imageMasked = CGBitmapContextCreateImage(context);

    CGContextRelease(context);

    CGColorSpaceRelease(colorSpace);

    UIImage *newImage = [UIImage imageWithCGImage:imageMasked scale:screenScale orientation:UIImageOrientationUp];

    CGImageRelease(imageMasked);

    return newImage;

}

// by http://www.sixtemia.com/journal/2010/06/23/uiimage-negative-color-effect/

-(UIImage *)convertToNegative {

    UIGraphicsBeginImageContext(self.size);

    CGContextSetBlendMode(UIGraphicsGetCurrentContext(), kCGBlendModeCopy);

    [self drawInRect:CGRectMake(0, 0, self.size.width, self.size.height)];

    CGContextSetBlendMode(UIGraphicsGetCurrentContext(), kCGBlendModeDifference);

    CGContextSetFillColorWithColor(UIGraphicsGetCurrentContext(),[UIColor whiteColor].CGColor);

    CGContextFillRect(UIGraphicsGetCurrentContext(), CGRectMake(0, 0, self.size.width, self.size.height));

    // create an image from the current contex (not thread safe)

    UIImage *result = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    return result;

}

+(UIImage *)whiteImage:(CGSize) ofSize {

    CGFloat w = ofSize.width;

    CGFloat h = ofSize.height;

    DLog(@"w: %f, h: %f", w, h);

    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();

    CGContextRef context = CGBitmapContextCreate(NULL, w, h, 8, 4 * w, colorSpace, kCGImageAlphaPremultipliedFirst);

    CGContextBeginPath(context);

    CGContextSetRGBFillColor(context, 1.0, 1.0, 1.0, 1.0);

    CGContextFillRect(context,CGRectMake(0,0,ofSize.width,ofSize.height));

    CGImageRef image = CGBitmapContextCreateImage(context);

    CGContextRelease(context);

    CGColorSpaceRelease(colorSpace);

    UIImage *bkgImg = [UIImage imageWithCGImage:image];

    CGImageRelease(image);

    return bkgImg;

}

// this routine checks for the PNG size without loading it in memory

// https://github.com/steipete/PSFramework/blob/master/PSFramework%20Version%200.3/PhotoshopFramework/PSMetaDataFunctions.m

+(CGSize) imageSizeFromMetadataOf:(NSString *)aFileName {

    // File Name to C String.

    const char *fileName = [aFileName UTF8String];

    // source file

    FILE *infile = fopen(fileName, "rb");

    if (infile == NULL) {

        DLog(@"Can't open the file: %@", aFileName);

        return CGSizeZero;

    }

    // Bytes Buffer.

    unsigned char buffer[30];

    // Grab Only First Bytes.

    fread(buffer, 1, 30, infile);

    // Close File.

    fclose(infile);

    // PNG Signature.

    unsigned char png_signature[8] = {137, 80, 78, 71, 13, 10, 26, 10};

    // Compare File signature.

    if ((int)(memcmp(&buffer[0], &png_signature[0], 8))) {

        DLog(@"The file (%@) is not a PNG file", aFileName);

        return CGSizeZero;

    }

    // Calc Sizes. Isolate only four bytes of each size (width, height).

    int width[4];

    int height[4];

    for (int d = 16; d < (16 + 4); d++) {

        width[d-16] = buffer[d];

        height[d-16] = buffer[d+4];

    }

    // Convert bytes to Long (Integer)

    long resultWidth = (width[0] << (int)24) | (width[1] << (int)16) | (width[2] << (int)8) | width[3];

    long resultHeight = (height[0] << (int)24) | (height[1] << (int)16) | (height[2] << (int)8) | height[3];

    // Return Size.

    return CGSizeMake(resultWidth,resultHeight);

}

@end