首先看效果:
核心代碼:
- //加模糊效果,image是圖片,blur是模糊度
- - (UIImage *)blurryImage:(UIImage *)image withBlurLevel:(CGFloat)blur {
- //模糊度,
- if ((blur < 0.1f) || (blur > 2.0f)) {
- blur = 0.5f;
- }
- //boxSize必須大於0
- int boxSize = (int)(blur * 100);
- boxSize -= (boxSize % 2) + 1;
- NSLog(@"boxSize:%i",boxSize);
- //圖像處理
- CGImageRef img = image.CGImage;
- //需要引入#import <Accelerate/Accelerate.h>
- /*
- This document describes the Accelerate Framework, which contains C APIs for vector and matrix math, digital signal processing, large number handling, and image processing.
- 本文檔介紹了Accelerate Framework,其中包含C語言應用程序接口(API)的向量和矩陣數學,數字信號處理,大量處理和圖像處理。
- */
- //圖像緩存,輸入緩存,輸出緩存
- vImage_Buffer inBuffer, outBuffer;
- vImage_Error error;
- //像素緩存
- void *pixelBuffer;
- //數據源提供者,Defines an opaque type that supplies Quartz with data.
- CGDataProviderRef inProvider = CGImageGetDataProvider(img);
- // provider’s data.
- CFDataRef inBitmapData = CGDataProviderCopyData(inProvider);
- //寬,高,字節/行,data
- inBuffer.width = CGImageGetWidth(img);
- inBuffer.height = CGImageGetHeight(img);
- inBuffer.rowBytes = CGImageGetBytesPerRow(img);
- inBuffer.data = (void*)CFDataGetBytePtr(inBitmapData);
- //像數緩存,字節行*圖片高
- pixelBuffer = malloc(CGImageGetBytesPerRow(img) * CGImageGetHeight(img));
- outBuffer.data = pixelBuffer;
- outBuffer.width = CGImageGetWidth(img);
- outBuffer.height = CGImageGetHeight(img);
- outBuffer.rowBytes = CGImageGetBytesPerRow(img);
- // 第三個中間的緩存區,抗鋸齒的效果
- void *pixelBuffer2 = malloc(CGImageGetBytesPerRow(img) * CGImageGetHeight(img));
- vImage_Buffer outBuffer2;
- outBuffer2.data = pixelBuffer2;
- outBuffer2.width = CGImageGetWidth(img);
- outBuffer2.height = CGImageGetHeight(img);
- outBuffer2.rowBytes = CGImageGetBytesPerRow(img);
- //Convolves a region of interest within an ARGB8888 source image by an implicit M x N kernel that has the effect of a box filter.
- error = vImageBoxConvolve_ARGB8888(&inBuffer, &outBuffer2, NULL, 0, 0, boxSize, boxSize, NULL, kvImageEdgeExtend);
- error = vImageBoxConvolve_ARGB8888(&outBuffer2, &inBuffer, NULL, 0, 0, boxSize, boxSize, NULL, kvImageEdgeExtend);
- error = vImageBoxConvolve_ARGB8888(&inBuffer, &outBuffer, NULL, 0, 0, boxSize, boxSize, NULL, kvImageEdgeExtend);
- if (error) {
- NSLog(@"error from convolution %ld", error);
- }
- // NSLog(@"字節組成部分:%zu",CGImageGetBitsPerComponent(img));
- //顏色空間DeviceRGB
- CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
- //用圖片創建上下文,CGImageGetBitsPerComponent(img),7,8
- CGContextRef ctx = CGBitmapContextCreate(
- outBuffer.data,
- outBuffer.width,
- outBuffer.height,
- 8,
- outBuffer.rowBytes,
- colorSpace,
- CGImageGetBitmapInfo(image.CGImage));
- //根據上下文,處理過的圖片,重新組件
- CGImageRef imageRef = CGBitmapContextCreateImage (ctx);
- UIImage *returnImage = [UIImage imageWithCGImage:imageRef];
- //clean up
- CGContextRelease(ctx);
- CGColorSpaceRelease(colorSpace);
- free(pixelBuffer);
- free(pixelBuffer2);
- CFRelease(inBitmapData);
- CGColorSpaceRelease(colorSpace);
- CGImageRelease(imageRef);
- return returnImage;
- }