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//
// UIImage+ImageProcessing.m
//
// Created by Vincent Saluzzo on 28/05/12.
// Copyright (c) 2012. All rights reserved.
//
#import "UIImage+EasyExtend.h"
#import<Accelerate/Accelerate.h>
#define ORIGINAL_MAX_WIDTH 640.0f
@implementation UIImage (EasyExtend)
- (UIImage *) toGrayscale
{
const int RED = 1;
const int GREEN = 2;
const int BLUE = 3;
// Create image rectangle with current image width/height
CGRect imageRect = CGRectMake(0, 0, self.size.width * self.scale, self.size.height * self.scale);
int width = imageRect.size.width;
int height = imageRect.size.height;
// the pixels will be painted to this array
uint32_t *pixels = (uint32_t *) malloc(width * height * sizeof(uint32_t));
// clear the pixels so any transparency is preserved
memset(pixels, 0, width * height * sizeof(uint32_t));
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
// create a context with RGBA pixels
CGContextRef context = CGBitmapContextCreate(pixels, width, height, 8, width * sizeof(uint32_t), colorSpace,
kCGBitmapByteOrder32Little | kCGImageAlphaPremultipliedLast);
// paint the bitmap to our context which will fill in the pixels array
CGContextDrawImage(context, CGRectMake(0, 0, width, height), [self CGImage]);
for(int y = 0; y < height; y++) {
for(int x = 0; x < width; x++) {
uint8_t *rgbaPixel = (uint8_t *) &pixels[y * width + x];
// convert to grayscale using recommended method: http://en.wikipedia.org/wiki/Grayscale#Converting_color_to_grayscale
uint32_t gray = 0.3 * rgbaPixel[RED] + 0.59 * rgbaPixel[GREEN] + 0.11 * rgbaPixel[BLUE];
// set the pixels to gray
rgbaPixel[RED] = gray;
rgbaPixel[GREEN] = gray;
rgbaPixel[BLUE] = gray;
}
}
// create a new CGImageRef from our context with the modified pixels
CGImageRef image = CGBitmapContextCreateImage(context);
// we're done with the context, color space, and pixels
CGContextRelease(context);
CGColorSpaceRelease(colorSpace);
free(pixels);
// make a new UIImage to return
UIImage *resultUIImage = [UIImage imageWithCGImage:image
scale:self.scale
orientation:UIImageOrientationUp];
// we're done with image now too
CGImageRelease(image);
return resultUIImage;
}
- (UIImage *)tintWithColor:(UIColor *)tintColor
{
// Begin drawing
CGRect aRect = CGRectMake(0.f, 0.f, self.size.width, self.size.height);
CGImageRef alphaMask;
//
// Compute mask flipping image
//
{
UIGraphicsBeginImageContext(aRect.size);
CGContextRef c = UIGraphicsGetCurrentContext();
// draw image
CGContextTranslateCTM(c, 0, aRect.size.height);
CGContextScaleCTM(c, 1.0, -1.0);
[self drawInRect: aRect];
alphaMask = CGBitmapContextCreateImage(c);
UIGraphicsEndImageContext();
}
//
UIGraphicsBeginImageContext(aRect.size);
// Get the graphic context
CGContextRef c = UIGraphicsGetCurrentContext();
// Draw the image
[self drawInRect:aRect];
// Mask
CGContextClipToMask(c, aRect, alphaMask);
// Set the fill color space
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
CGContextSetFillColorSpace(c, colorSpace);
// Set the fill color
CGContextSetFillColorWithColor(c, tintColor.CGColor);
UIRectFillUsingBlendMode(aRect, kCGBlendModeNormal);
UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
// Release memory
CGColorSpaceRelease(colorSpace);
CGImageRelease(alphaMask);
return img;
}
+ (UIImage *) imageWithUrl:(NSString *)url{
return [UIImage imageWithData: [NSData dataWithContentsOfURL:[NSURL URLWithString:url]]];
}
+ (UIImage *)imageWithColor:(UIColor *)color {
return [self imageWithColor:color size:CGSizeMake(1,1)];
}
+ (UIImage *)imageWithColor:(UIColor *)color size:(CGSize)size {
CGRect rect = CGRectMake(0, 0, size.width, size.height);
UIGraphicsBeginImageContextWithOptions(rect.size,NO,1.0f);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetFillColorWithColor(context, [color CGColor]);
CGContextFillRect(context, rect);
UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return img;
}
+ (UIImage *)resizableImageWithColor:(UIColor *)color cornerRadius:(CGFloat)cornerRadius {
CGFloat minEdgeSize = cornerRadius * 2 + 1;
CGRect rect = CGRectMake(0, 0, minEdgeSize, minEdgeSize);
UIBezierPath *roundedRect = [UIBezierPath bezierPathWithRoundedRect:rect cornerRadius:cornerRadius];
roundedRect.lineWidth = 0;
UIGraphicsBeginImageContextWithOptions(rect.size, NO, 0.0f);
[color setFill];
[roundedRect fill];
[roundedRect stroke];
[roundedRect addClip];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return [image resizableImageWithCapInsets:UIEdgeInsetsMake(cornerRadius, cornerRadius, cornerRadius, cornerRadius)];
}
- (UIImage *)imageByScalingToMaxSize {
if (self.size.width < ORIGINAL_MAX_WIDTH) return self;
CGFloat btWidth = 0.0f;
CGFloat btHeight = 0.0f;
if (self.size.width > self.size.height) {
btHeight = ORIGINAL_MAX_WIDTH;
btWidth = self.size.width * (ORIGINAL_MAX_WIDTH / self.size.height);
} else {
btWidth = ORIGINAL_MAX_WIDTH;
btHeight = self.size.height * (ORIGINAL_MAX_WIDTH / self.size.width);
}
CGSize targetSize = CGSizeMake(btWidth, btHeight);
return [self imageByScalingAndCroppingToSize:targetSize];
}
- (UIImage *)imageByScalingAndCroppingToSize:(CGSize)targetSize {
UIImage *newImage = nil;
CGSize imageSize = self.size;
CGFloat width = imageSize.width;
CGFloat height = imageSize.height;
CGFloat targetWidth = targetSize.width;
CGFloat targetHeight = targetSize.height;
CGFloat scaleFactor = 0.0;
CGFloat scaledWidth = targetWidth;
CGFloat scaledHeight = targetHeight;
CGPoint thumbnailPoint = CGPointMake(0.0,0.0);
if (CGSizeEqualToSize(imageSize, targetSize) == NO)
{
CGFloat widthFactor = targetWidth / width;
CGFloat heightFactor = targetHeight / height;
if (widthFactor > heightFactor)
scaleFactor = widthFactor; // scale to fit height
else
scaleFactor = heightFactor; // scale to fit width
scaledWidth = width * scaleFactor;
scaledHeight = height * scaleFactor;
// center the image
if (widthFactor > heightFactor)
{
thumbnailPoint.y = (targetHeight - scaledHeight) * 0.5;
}
else
if (widthFactor < heightFactor)
{
thumbnailPoint.x = (targetWidth - scaledWidth) * 0.5;
}
}
UIGraphicsBeginImageContext(targetSize); // this will crop
CGRect thumbnailRect = CGRectZero;
thumbnailRect.origin = thumbnailPoint;
thumbnailRect.size.width = scaledWidth;
thumbnailRect.size.height = scaledHeight;
[self drawInRect:thumbnailRect];
newImage = UIGraphicsGetImageFromCurrentImageContext();
if(newImage == nil) NSLog(@"could not scale image");
//pop the context to get back to the default
UIGraphicsEndImageContext();
return newImage;
}
-(UIImage*)applyLightEffect
{
UIColor*tintColor =[UIColor colorWithWhite:1.0 alpha:0.3];
return[self applyBlurWithRadius:30 tintColor:tintColor saturationDeltaFactor:1.8 maskImage:nil];
}
-(UIImage*)applyExtraLightEffect
{
UIColor*tintColor =[UIColor colorWithWhite:0.97 alpha:0.82];
return[self applyBlurWithRadius:20 tintColor:tintColor saturationDeltaFactor:1.8 maskImage:nil];
}
-(UIImage*)applyDarkEffect
{
UIColor*tintColor =[UIColor colorWithWhite:0.11 alpha:0.73];
return[self applyBlurWithRadius:20 tintColor:tintColor saturationDeltaFactor:1.8 maskImage:nil];
}
-(UIImage*)applyTintEffectWithColor:(UIColor*)tintColor
{
const CGFloat EffectColorAlpha=0.6;
UIColor*effectColor = tintColor;
int componentCount =CGColorGetNumberOfComponents(tintColor.CGColor);
if(componentCount ==2){
CGFloat b;
if([tintColor getWhite:&b alpha:NULL]){
effectColor =[UIColor colorWithWhite:b alpha:EffectColorAlpha];
}
}
else{
CGFloat r, g, b;
if([tintColor getRed:&r green:&g blue:&b alpha:NULL]){
effectColor =[UIColor colorWithRed:r green:g blue:b alpha:EffectColorAlpha];
}
}
return[self applyBlurWithRadius:10 tintColor:effectColor saturationDeltaFactor:-1.0 maskImage:nil];
}
-(UIImage*)applyBlurWithRadius:(CGFloat)blurRadius tintColor:(UIColor*)tintColor saturationDeltaFactor:(CGFloat)saturationDeltaFactor maskImage:(UIImage*)maskImage
{
// Check pre-conditions.
if(self.size.width <1||self.size.height <1){
NSLog(@"*** error: invalid size: (%.2f x %.2f). Both dimensions must be >= 1: %@",self.size.width,self.size.height,self);
return nil;
}
if(!self.CGImage){
NSLog(@"*** error: image must be backed by a CGImage: %@",self);
return nil;
}
if(maskImage &&!maskImage.CGImage){
NSLog(@"*** error: maskImage must be backed by a CGImage: %@", maskImage);
return nil;
}
CGRect imageRect ={CGPointZero,self.size };
UIImage*effectImage =self;
BOOL hasBlur = blurRadius > __FLT_EPSILON__;
BOOL hasSaturationChange = fabs(saturationDeltaFactor -1.)> __FLT_EPSILON__;
if(hasBlur || hasSaturationChange){
UIGraphicsBeginImageContextWithOptions(self.size, NO,[[UIScreen mainScreen] scale]);
CGContextRef effectInContext =UIGraphicsGetCurrentContext();
CGContextScaleCTM(effectInContext,1.0,-1.0);
CGContextTranslateCTM(effectInContext,0,-self.size.height);
CGContextDrawImage(effectInContext, imageRect,self.CGImage);
vImage_Buffer effectInBuffer;
effectInBuffer.data =CGBitmapContextGetData(effectInContext);
effectInBuffer.width =CGBitmapContextGetWidth(effectInContext);
effectInBuffer.height =CGBitmapContextGetHeight(effectInContext);
effectInBuffer.rowBytes =CGBitmapContextGetBytesPerRow(effectInContext);
UIGraphicsBeginImageContextWithOptions(self.size, NO,[[UIScreen mainScreen] scale]);
CGContextRef effectOutContext =UIGraphicsGetCurrentContext();
vImage_Buffer effectOutBuffer;
effectOutBuffer.data =CGBitmapContextGetData(effectOutContext);
effectOutBuffer.width =CGBitmapContextGetWidth(effectOutContext);
effectOutBuffer.height =CGBitmapContextGetHeight(effectOutContext);
effectOutBuffer.rowBytes =CGBitmapContextGetBytesPerRow(effectOutContext);
if(hasBlur){
// A description of how to compute the box kernel width from the Gaussian
// radius (aka standard deviation) appears in the SVG spec:
// http://www.w3.org/TR/SVG/filters.html#feGaussianBlurElement
//
// For larger values of 's' (s >= 2.0), an approximation can be used: Three
// successive box-blurs build a piece-wise quadratic convolution kernel, which
// approximates the Gaussian kernel to within roughly 3%.
//
// let d = floor(s * 3*sqrt(2*pi)/4 + 0.5)
//
// ... if d is odd, use three box-blurs of size 'd', centered on the output pixel.
//
CGFloat inputRadius = blurRadius *[[UIScreen mainScreen] scale];
NSUInteger radius = floor(inputRadius *3.* sqrt(2* M_PI)/4+0.5);
if(radius %2!=1){
radius +=1;// force radius to be odd so that the three box-blur methodology works.
}
vImageBoxConvolve_ARGB8888(&effectInBuffer,&effectOutBuffer, NULL,0,0, radius, radius,0, kvImageEdgeExtend);
vImageBoxConvolve_ARGB8888(&effectOutBuffer,&effectInBuffer, NULL,0,0, radius, radius,0, kvImageEdgeExtend);
vImageBoxConvolve_ARGB8888(&effectInBuffer,&effectOutBuffer, NULL,0,0, radius, radius,0, kvImageEdgeExtend);
}
BOOL effectImageBuffersAreSwapped = NO;
if(hasSaturationChange){
CGFloat s = saturationDeltaFactor;
CGFloat floatingPointSaturationMatrix[]={
0.0722+0.9278* s,0.0722-0.0722* s,0.0722-0.0722* s,0,
0.7152-0.7152* s,0.7152+0.2848* s,0.7152-0.7152* s,0,
0.2126-0.2126* s,0.2126-0.2126* s,0.2126+0.7873* s,0,
0,0,0,1,
};
const int32_t divisor =256;
NSUInteger matrixSize =sizeof(floatingPointSaturationMatrix)/sizeof(floatingPointSaturationMatrix[0]);
int16_t saturationMatrix[matrixSize];
for(NSUInteger i =0; i < matrixSize;++i){
saturationMatrix[i]=(int16_t)roundf(floatingPointSaturationMatrix[i]* divisor);
}
if(hasBlur){
vImageMatrixMultiply_ARGB8888(&effectOutBuffer,&effectInBuffer, saturationMatrix, divisor, NULL, NULL, kvImageNoFlags);
effectImageBuffersAreSwapped = YES;
}
else{
vImageMatrixMultiply_ARGB8888(&effectInBuffer,&effectOutBuffer, saturationMatrix, divisor, NULL, NULL, kvImageNoFlags);
}
}
if(!effectImageBuffersAreSwapped)
effectImage =UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
if(effectImageBuffersAreSwapped)
effectImage =UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
}
// Set up output context.
UIGraphicsBeginImageContextWithOptions(self.size, NO,[[UIScreen mainScreen] scale]);
CGContextRef outputContext =UIGraphicsGetCurrentContext();
CGContextScaleCTM(outputContext,1.0,-1.0);
CGContextTranslateCTM(outputContext,0,-self.size.height);
// Draw base image.
CGContextDrawImage(outputContext, imageRect,self.CGImage);
// Draw effect image.
if(hasBlur){
CGContextSaveGState(outputContext);
if(maskImage){
CGContextClipToMask(outputContext, imageRect, maskImage.CGImage);
}
CGContextDrawImage(outputContext, imageRect, effectImage.CGImage);
CGContextRestoreGState(outputContext);
}
// Add in color tint.
if(tintColor){
CGContextSaveGState(outputContext);
CGContextSetFillColorWithColor(outputContext, tintColor.CGColor);
CGContextFillRect(outputContext, imageRect);
CGContextRestoreGState(outputContext);
}
// Output image is ready.
UIImage*outputImage =UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return outputImage;
}
+ (UIImage *) imageFromData: (NSString *) imgSrc
{
if ([imgSrc hasPrefix:@"data:"]) {
NSArray *array = [imgSrc componentsSeparatedByString:@"base64,"];
NSData *data = [[NSData alloc]initWithBase64EncodedString:[array objectAtIndex:1] options:NSDataBase64DecodingIgnoreUnknownCharacters];
return [UIImage imageWithData:data];
}else if([imgSrc hasPrefix:@"http://"] || [imgSrc hasPrefix:@"https://"] ){
return [UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:imgSrc]]];
}else if([UIImage imageNamed:imgSrc]){
return [UIImage imageNamed:imgSrc];
}else{
return nil;
}
}
- (BOOL) imageHasAlpha
{
CGImageAlphaInfo alpha = CGImageGetAlphaInfo(self.CGImage);
return (alpha == kCGImageAlphaFirst ||
alpha == kCGImageAlphaLast ||
alpha == kCGImageAlphaPremultipliedFirst ||
alpha == kCGImageAlphaPremultipliedLast);
}
- (NSString *) image2DataURL
{
NSData *imageData = nil;
NSString *mimeType = nil;
if ([self imageHasAlpha]) {
imageData = UIImagePNGRepresentation(self);
mimeType = @"image/png";
} else {
imageData = UIImageJPEGRepresentation(self, 1.0f);
mimeType = @"image/jpeg";
}
return [NSString stringWithFormat:@"data:%@;base64,%@", mimeType,
[imageData base64EncodedStringWithOptions:0]];
}
@end
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