iOS：在uiimage上带有发光/阴影效果的羽毛
我试图find一种方法来应用与UIImage周围的阴影羽毛效果，而不是UIImageView我在iOS中，我找不到任何完美的解决scheme。 我有一个想法，可以通过掩饰来完成，但我对CoreGraphics很新。
如果有人可以帮忙。
谢谢。
好吧，我正在寻找同样的东西，但不幸的是没有运气。 我决定创build自己的羽毛代码。
将这段代码添加到UIImage扩展，然后调用[image featherImageWithDepth:4] ，4就是例子。 尽量保持尽可能低的深度。
//============================================================================== - (UIImage*)featherImageWithDepth:(int)featherDepth { // First get the image into your data buffer CGImageRef imageRef = [self CGImage]; NSUInteger width = CGImageGetWidth(imageRef); NSUInteger height = CGImageGetHeight(imageRef); CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB(); unsigned char *rawData = (unsigned char*) calloc(height * width * 4, sizeof(unsigned char)); NSUInteger bytesPerPixel = 4; NSUInteger bytesPerRow = bytesPerPixel * width; NSUInteger bitsPerComponent = 8; CGContextRef context = CGBitmapContextCreate(rawData, width, height, bitsPerComponent, bytesPerRow, colorSpace, kCGImageAlphaPremultipliedLast | kCGBitmapByteOrder32Big); CGColorSpaceRelease(colorSpace); CGContextDrawImage(context, CGRectMake(0, 0, width, height), imageRef); // Now your rawData contains the image data in the RGBA8888 pixel format. NSUInteger byteIndex = 0; NSUInteger rawDataCount = width*height; for (int i = 0 ; i < rawDataCount ; ++i, byteIndex += bytesPerPixel) { NSInteger alphaIndex = byteIndex + 3; if (rawData[alphaIndex] > 100) { for (int row = 1; row <= featherDepth; row++) { if (testBorderLayer((long)alphaIndex, rawData, (long)rawDataCount, (long)width, (long)height, row)) { int destinationAlpha = 255 / (featherDepth+1) * (row + 1); double alphaDiv = (double)destinationAlpha / (double)rawData[alphaIndex]; rawData[alphaIndex] = destinationAlpha; rawData[alphaIndex-1] = (double)rawData[alphaIndex-1] * alphaDiv; rawData[alphaIndex-2] = (double)rawData[alphaIndex-2] * alphaDiv; rawData[alphaIndex-3] = (double)rawData[alphaIndex-3] * alphaDiv; // switch (row) { // case 1: // rawData[alphaIndex-1] = 255; // rawData[alphaIndex-2] = 0; // rawData[alphaIndex-3] = 0; // break; // case 2: // rawData[alphaIndex-1] = 0; // rawData[alphaIndex-2] = 255; // rawData[alphaIndex-3] = 0; // break; // case 3: // rawData[alphaIndex-1] = 0; // rawData[alphaIndex-2] = 0; // rawData[alphaIndex-3] = 255; // break; // case 4: // rawData[alphaIndex-1] = 127; // rawData[alphaIndex-2] = 127; // rawData[alphaIndex-3] = 0; // break; // case 5: // rawData[alphaIndex-1] = 127; // rawData[alphaIndex-2] = 0; // rawData[alphaIndex-3] = 127; // case 6: // rawData[alphaIndex-1] = 0; // rawData[alphaIndex-2] = 127; // rawData[alphaIndex-3] = 127; // break; // default: // break; // } break; } } } } CGImageRef newCGImage = CGBitmapContextCreateImage(context); UIImage *result = [UIImage imageWithCGImage:newCGImage scale:[self scale] orientation:UIImageOrientationUp]; CGImageRelease(newCGImage); CGContextRelease(context); free(rawData); return result; } //============================================================================== bool testBorderLayer(long byteIndex, unsigned char *imageData, long dataSize, long pWidth, long pHeight, int border) { int width = border * 2 + 1; int height = width - 2; // run thru border pixels // |-| // | | // |-| //top,bot - hor for (int i = 1; i < width - 1; i++) { long topIndex = byteIndex + 4 * ( - border * pWidth - border + i); long botIndex = byteIndex + 4 * ( border * pWidth - border + i); long destColl = byteIndex/4 % pWidth - border + i; if (destColl > 1 && destColl < pWidth) { if (testPoint(topIndex, imageData, dataSize) || testPoint(botIndex, imageData, dataSize)) { return true; } } } //left,right - ver if (byteIndex / 4 % pWidth < pWidth - border - 1) { for (int k = 0; k < height; k++) { long rightIndex = byteIndex + 4 * ( border - (border) * pWidth + pWidth * k); if (testPoint(rightIndex, imageData, dataSize)) { return true; } } } if (byteIndex / 4 % pWidth > border) { for (int k = 0; k < height; k++) { long leftIndex = byteIndex + 4 * ( - border - (border) * pWidth + pWidth * k); if (testPoint(leftIndex, imageData, dataSize)) { return true; } } } return false; } //============================================================================== bool testPoint(long pointIndex, unsigned char *imageData, long dataSize) { if (pointIndex >= 0 && pointIndex < dataSize * 4 - 1 && imageData[pointIndex] < 30) { return true; } return false; } //==============================================================================
对罕见的评论抱歉;）
我build议看看这个由苹果公司推出的CIFilter列表，他们得到了一些相当不错的filter。
- /参考/ CoreImageFilterReference
还可以看看GPUImage。