233 lines
9.0 KiB
Objective-C
233 lines
9.0 KiB
Objective-C
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#import "UIImage+ImageEffects.h"
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#import <Accelerate/Accelerate.h>
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#import <float.h>
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@implementation UIImage (ImageEffects)
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- (UIImage *)applyLightEffect
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{
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UIColor *tintColor = [UIColor colorWithWhite:1.0 alpha:0.3];
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return [self applyBlurWithRadius:30 tintColor:tintColor saturationDeltaFactor:1.8 maskImage:nil];
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}
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- (UIImage *)applyExtraLightEffect
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{
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UIColor *tintColor = [UIColor colorWithWhite:0.97 alpha:0.82];
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return [self applyBlurWithRadius:12 tintColor:tintColor saturationDeltaFactor:1.8 maskImage:nil];
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}
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- (UIImage *)applyDarkEffect
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{
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UIColor *tintColor = [UIColor colorWithWhite:0.11 alpha:0.73];
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return [self applyBlurWithRadius:20 tintColor:tintColor saturationDeltaFactor:1.8 maskImage:nil];
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}
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- (UIImage *)applyTintEffectWithColor:(UIColor *)tintColor
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{
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const CGFloat EffectColorAlpha = 0.6;
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UIColor *effectColor = tintColor;
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int componentCount = CGColorGetNumberOfComponents(tintColor.CGColor);
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if (componentCount == 2) {
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CGFloat b;
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if ([tintColor getWhite:&b alpha:NULL]) {
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effectColor = [UIColor colorWithWhite:b alpha:EffectColorAlpha];
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}
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}
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else {
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CGFloat r, g, b;
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if ([tintColor getRed:&r green:&g blue:&b alpha:NULL]) {
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effectColor = [UIColor colorWithRed:r green:g blue:b alpha:EffectColorAlpha];
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}
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}
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return [self applyBlurWithRadius:10 tintColor:effectColor saturationDeltaFactor:-1.0 maskImage:nil];
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}
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- (UIImage *)applyBlurWithRadius:(CGFloat)blurRadius tintColor:(UIColor *)tintColor saturationDeltaFactor:(CGFloat)saturationDeltaFactor maskImage:(UIImage *)maskImage
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{
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// Check pre-conditions.
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if (self.size.width < 1 || self.size.height < 1) {
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NSLog (@"*** error: invalid size: (%.2f x %.2f). Both dimensions must be >= 1: %@", self.size.width, self.size.height, self);
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return nil;
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}
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if (!self.CGImage) {
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NSLog (@"*** error: image must be backed by a CGImage: %@", self);
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return nil;
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}
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if (maskImage && !maskImage.CGImage) {
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NSLog (@"*** error: maskImage must be backed by a CGImage: %@", maskImage);
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return nil;
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}
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CGRect imageRect = { CGPointZero, self.size };
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UIImage *effectImage = self;
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BOOL hasBlur = blurRadius > __FLT_EPSILON__;
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BOOL hasSaturationChange = fabs(saturationDeltaFactor - 1.) > __FLT_EPSILON__;
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if (hasBlur || hasSaturationChange) {
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UIGraphicsBeginImageContextWithOptions(self.size, NO, [[UIScreen mainScreen] scale]);
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CGContextRef effectInContext = UIGraphicsGetCurrentContext();
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CGContextScaleCTM(effectInContext, 1.0, -1.0);
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CGContextTranslateCTM(effectInContext, 0, -self.size.height);
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CGContextDrawImage(effectInContext, imageRect, self.CGImage);
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vImage_Buffer effectInBuffer;
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effectInBuffer.data = CGBitmapContextGetData(effectInContext);
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effectInBuffer.width = CGBitmapContextGetWidth(effectInContext);
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effectInBuffer.height = CGBitmapContextGetHeight(effectInContext);
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effectInBuffer.rowBytes = CGBitmapContextGetBytesPerRow(effectInContext);
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UIGraphicsBeginImageContextWithOptions(self.size, NO, [[UIScreen mainScreen] scale]);
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CGContextRef effectOutContext = UIGraphicsGetCurrentContext();
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vImage_Buffer effectOutBuffer;
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effectOutBuffer.data = CGBitmapContextGetData(effectOutContext);
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effectOutBuffer.width = CGBitmapContextGetWidth(effectOutContext);
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effectOutBuffer.height = CGBitmapContextGetHeight(effectOutContext);
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effectOutBuffer.rowBytes = CGBitmapContextGetBytesPerRow(effectOutContext);
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if (hasBlur) {
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// A description of how to compute the box kernel width from the Gaussian
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// radius (aka standard deviation) appears in the SVG spec:
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// http://www.w3.org/TR/SVG/filters.html#feGaussianBlurElement
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//
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// For larger values of 's' (s >= 2.0), an approximation can be used: Three
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// successive box-blurs build a piece-wise quadratic convolution kernel, which
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// approximates the Gaussian kernel to within roughly 3%.
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//
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// let d = floor(s * 3*sqrt(2*pi)/4 + 0.5)
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//
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// ... if d is odd, use three box-blurs of size 'd', centered on the output pixel.
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//
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CGFloat inputRadius = blurRadius * [[UIScreen mainScreen] scale];
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NSUInteger radius = floor(inputRadius * 3. * sqrt(2 * M_PI) / 4 + 0.5);
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if (radius % 2 != 1) {
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radius += 1; // force radius to be odd so that the three box-blur methodology works.
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}
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vImageBoxConvolve_ARGB8888(&effectInBuffer, &effectOutBuffer, NULL, 0, 0, radius, radius, 0, kvImageEdgeExtend);
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vImageBoxConvolve_ARGB8888(&effectOutBuffer, &effectInBuffer, NULL, 0, 0, radius, radius, 0, kvImageEdgeExtend);
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vImageBoxConvolve_ARGB8888(&effectInBuffer, &effectOutBuffer, NULL, 0, 0, radius, radius, 0, kvImageEdgeExtend);
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}
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BOOL effectImageBuffersAreSwapped = NO;
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if (hasSaturationChange) {
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CGFloat s = saturationDeltaFactor;
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CGFloat floatingPointSaturationMatrix[] = {
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0.0722 + 0.9278 * s, 0.0722 - 0.0722 * s, 0.0722 - 0.0722 * s, 0,
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0.7152 - 0.7152 * s, 0.7152 + 0.2848 * s, 0.7152 - 0.7152 * s, 0,
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0.2126 - 0.2126 * s, 0.2126 - 0.2126 * s, 0.2126 + 0.7873 * s, 0,
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0, 0, 0, 1,
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};
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const int32_t divisor = 256;
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NSUInteger matrixSize = sizeof(floatingPointSaturationMatrix)/sizeof(floatingPointSaturationMatrix[0]);
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int16_t saturationMatrix[matrixSize];
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for (NSUInteger i = 0; i < matrixSize; ++i) {
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saturationMatrix[i] = (int16_t)roundf(floatingPointSaturationMatrix[i] * divisor);
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}
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if (hasBlur) {
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vImageMatrixMultiply_ARGB8888(&effectOutBuffer, &effectInBuffer, saturationMatrix, divisor, NULL, NULL, kvImageNoFlags);
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effectImageBuffersAreSwapped = YES;
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}
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else {
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vImageMatrixMultiply_ARGB8888(&effectInBuffer, &effectOutBuffer, saturationMatrix, divisor, NULL, NULL, kvImageNoFlags);
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}
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}
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if (!effectImageBuffersAreSwapped)
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effectImage = UIGraphicsGetImageFromCurrentImageContext();
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UIGraphicsEndImageContext();
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if (effectImageBuffersAreSwapped)
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effectImage = UIGraphicsGetImageFromCurrentImageContext();
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UIGraphicsEndImageContext();
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}
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// Set up output context.
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UIGraphicsBeginImageContextWithOptions(self.size, NO, [[UIScreen mainScreen] scale]);
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CGContextRef outputContext = UIGraphicsGetCurrentContext();
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CGContextScaleCTM(outputContext, 1.0, -1.0);
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CGContextTranslateCTM(outputContext, 0, -self.size.height);
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// Draw base image.
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CGContextDrawImage(outputContext, imageRect, self.CGImage);
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// Draw effect image.
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if (hasBlur) {
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CGContextSaveGState(outputContext);
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if (maskImage) {
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CGContextClipToMask(outputContext, imageRect, maskImage.CGImage);
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}
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CGContextDrawImage(outputContext, imageRect, effectImage.CGImage);
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CGContextRestoreGState(outputContext);
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}
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// Add in color tint.
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if (tintColor) {
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CGContextSaveGState(outputContext);
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CGContextSetFillColorWithColor(outputContext, tintColor.CGColor);
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CGContextFillRect(outputContext, imageRect);
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CGContextRestoreGState(outputContext);
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}
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// Output image is ready.
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UIImage *outputImage = UIGraphicsGetImageFromCurrentImageContext();
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UIGraphicsEndImageContext();
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return outputImage;
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}
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-(UIImage *)circleImageWithName:(NSString *)name borderWidth:(CGFloat)borderWidth borderColour:(UIColor *)borderColor{
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//load imge
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UIImage *oldImage=[UIImage imageNamed:name];
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//kai qi shang xia wen
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CGFloat imageW = oldImage.size.width + 22 * borderWidth;
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CGFloat imageH = oldImage.size.height + 22 * borderWidth;
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CGSize imageSize = CGSizeMake(imageW, imageH);
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UIGraphicsBeginImageContextWithOptions(imageSize, NO, 0.0);
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//get dang qian shang xia wen
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CGContextRef ctx = UIGraphicsGetCurrentContext();
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// hua bian kuang（大圆）
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[borderColor set];
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//r
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CGFloat bigRadius = imageW * 0.5;
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//o 圆心
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CGFloat centerX = bigRadius;
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CGFloat centerY = bigRadius;
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CGContextAddArc(ctx, centerX, centerY, bigRadius, 0, M_PI * 2, 0);
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CGContextFillPath(ctx);
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//小圆
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CGFloat smallRadius = bigRadius - borderWidth;
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CGContextAddArc(ctx, centerX, centerY, smallRadius, 0, M_PI * 2, 0);
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//
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CGContextClip(ctx);
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//画图
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[oldImage drawInRect:CGRectMake(borderWidth, borderWidth, oldImage.size.width, oldImage.size.height)];
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//取图
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UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
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//结束上下文
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UIGraphicsEndImageContext();
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return newImage;
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}
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@end
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