colorspace udma

= image;Cgcolorspaceref colorspace = cgcolorspacecreatedevicergb ();Cgcontextref context = cgbitmapcontextcreate (null, W, h, 8, 4 * w, colorspace, kcgimagealphapremultipliedfirst );Cgrect rect = cgrectmake (0, 0, W, H );Cgcontextbeginpath (context );Addroundedrecttopath (context, rect, 10, 10 );Cgcontextclosepath (context );Cgcontextclip (context );Cgcontextdrawimage (context, cgrectmake (0, 0, W, h), IMG

+ radius) controlpoint1: cgpointmake (xmax-radius + cpoffset, ymin) controlpoint2: cgpointmake (xmax, ymin + radius-cpoffset)]; // [Popoverpath addlinetopoint: cgpointmake (xmax, Ymax-radius)]; [Popoverpath addcurvetopoint: cgpointmake (xmax-radius, Ymax) controlpoint1: cgpointmake (xmax, Ymax-radius + cpoffset) controlpoint2: cgpointmake (xmax-radius + cpoffset, Ymax)]; // [Popoverpath addlinetopoint: cgpointmake (xmin + radius, Ymax)]; [Popoverpath addcurvetopoint: cgpointmake (xmin, Ymax-rad

1. Override drwarect -(Void) drawrect :( cgrect) rect {cgrect bounds = self. bounds; cgpoint center; center. X = bounds. origin. X + bounds. size. width/2.0; center. y = bounds. origin. Y + bounds. size. height/2.0; float maxradius = max (bounds. size. width, bounds. size. height );// Circle uibezierpath * Path = [[uibezierpath alloc] init]; for (float currentradius = maxradius; currentradius> 0; currentradius-= 20) {[path movetopoint: cgpointmake (center. X + currentradius, center. y)]; [path a

e ){}}Public void paint (Graphics g ){Graphics2d g2 = (graphics2d) g;Bimg = new bufferedimage (IW, IH, bufferedimage. type_int_rgb );Graphics2d srcg = bimg. creategraphics ();Renderinghints RHS = g2.getrenderinghints ();Srcg. setrenderinghints (RHs );Srcg. drawimage (source, 0, 0, null );Colorspace grayspace = colorspace. getinstance (colorspace. cs_gray );Color

); Bitmapbytecount = (bitmapbytesperrow * pixelshigh ); Colorspace = cgcolorspacecreatedevicergb (); Bitmapdata = malloc (bitmapbytecount ); If (bitmapdata = NULL) { Fprintf (stderr, "memorynotallocated! "); Returnnull; } Context = cgbitmapcontextcreate (bitmapdata, pixelswide, pixelshigh, 8, bitmapbytesperrow, colorspace, kcgimagealphapremultipliedlast ); If (context = NULL) { Free (bitmapdata ); Fprintf

); CGContextRestoreGState(context);}+ (id)createRoundedRectImage:(UIImage*)image size:(CGSize)size radius:(NSInteger)r{ // the size of CGContextRef int w = size.width; int h = size.height; UIImage *img = image; CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB(); CGContextRef context = CGBitmapContextCreate(NULL, w, h, 8, 4 * w, colorSpace, kCGImageAlphaPremultipliedFirst);

); glGetRenderbufferParameterivOES(GL_RENDERBUFFER_OES, GL_RENDERBUFFER_HEIGHT_OES, backingHeight); NSInteger x = 0, y = 0, width = backingWidth, height = backingHeight; NSInteger dataLength = width * height * 4; GLubyte *data = (GLubyte*)malloc(dataLength * sizeof(GLubyte)); // Read pixel data from the framebuffer glPixelStorei(GL_PACK_ALIGNMENT, 4); glReadPixels(x, y, width, height, GL_RGBA, GL_UNSIGNED_BYTE, data); // Create a CGImage wi

@ Synthesize sizeBrush;-(Id) initWithFrame :( CGRect) frame{Self = [super initWithFrame: frame];If (self ){[Self setOpaque: NO];// Set transparency. If it is not transparent, you cannot see the next layer.Self. sizeBrush = 10.0f;}Return self;}-(Void) drawRect :( CGRect) rect{[Super drawRect: rect];UIImage * imageToDraw = [UIImage imageWithCGImage: _ scratchCGImg];[ImageToDraw drawInRect: self. frame];}// SetSizeBrush before setHideView-(Void) setHideView :( UIView *) hideView {CGColorSpaceRef

colorWithWhite: 0.9 alpha: 1.0] setStroke];CGContextDrawPath (context, kCGPathFill );[[UIColor colorWithWhite: 0.1 alpha: 0.4] setFill];CGContextAddPath (context, path );CGContextDrawPath (context, kCGPathFill );}Else// Break;// CGContextSetBlendMode (context, kCGBlendModeMultiply );}// Overall gradientCGFloat componets [] = {0.0, 0.0, 0.0, 0.5, 0.0, 0.0, 0.0, 0.1 };CGColorSpaceRef colorspace = CGColorSpaceCreateDeviceRGB ();CGGradientRef gradient =

. size. width, self. size. height), point )){Return nil;}// Create a 1x1 pixel byte array and bitmap context to draw the pixel.// Reference: http://stackoverflow.com/questions/1042830/retrieving-a-pixel-alpha-value-for-a-uiimageNSInteger pointX = trunc (point. x );NSInteger pointY = trunc (point. y );CGImageRef cgImage = self. CGImage;NSUInteger width = self. size. width;NSUInteger height = self. size. height;CGColorSpaceRef colorSpace = CGColorSpaceC

Recently, when the image format is CMYK, the Image Upload browser cannot display the image normally, and the scaling of the image turns into a black screen, Later, Google found that ImageMagick has powerful functions. you can install ImageMagick in two ways: 1) directly compile and install it with PHP and call it in the program; 2) directly install it and call system commands. For simplicity, we have adopted 2nd types and directly used PHP or JSP to call the convert command to convert images fro

Process a known image as a gray image. -(Uiimage *) getgrayimage :( uiimage *) sourceimage { Int width = sourceimage. Size. width; Int Height = sourceimage. Size. height; Cgcolorspaceref colorspace = cgcolorspacecreatedevicegray (); Cgcontextref context = cgbitmapcontextcreate (nil, width, height, 8, 0, colorspace, kcgbitmapbyteorderdefault ); Cgcolorspacerelstrap (col