colorspace udma

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IOS animation and 2D and 3D drawing

:( cgrect) Frame{If (Self = [Super initwithframe: frame]) {Self. backgroundcolor = [uicolor whitecolor]; // specifies the background color of the view.Cgcolorspaceref colorspace = cgcolorspacecreatedevicergb (); // specify the color space as RGB.// Create a bitmap context with the View SizeWhiteboardcontext = cgbitmapcontextcreate (null, self. Frame. Size. Width, self. Frame. Size. Height, 8,4 * Self. Frame. Size. Width,

In ios, click the button to asynchronously load the image.

; CGFloat yScale = size. height/image. size. height; Return 1.0/MIN (xScale, yScale ); } -(UIImage *) addLogoImage :( UIImage *) logo toImage :( UIImage *) img { // Get image width and height CGFloat scale = [UIScreen mainScreen]. scale; Int w = scale * img. size. width; Int h = scale * img. size. height; Int logoWidth = logo. scale * logo. size. width; Int logoHeight = logo. scale * logo. size. height; CGColorSpaceRef colorSpace = CGColorSpaceCreateD

Blur iOS images

(img ); InBuffer. height = CGImageGetHeight (img ); InBuffer. rowBytes = CGImageGetBytesPerRow (img ); InBuffer. data = (void *) CFDataGetBytePtr (inBitmapData ); // Create vImage_Buffer for output PixelBuffer = malloc (CGImageGetBytesPerRow (img) * CGImageGetHeight (img )); OutBuffer. data = pixelBuffer; OutBuffer. width = CGImageGetWidth (img ); OutBuffer. height = CGImageGetHeight (img ); OutBuffer. rowBytes = CGImageGetBytesPerRow (img ); NSInteger windowR = boxSize/2; CGFloat sig2 = wi

Dual-buffer iPhone

-(Void) drawrect :( cgrect) rect { Nsstring * imagename = [[nsstring alloc] initwithformat: @ "bw.d.png", m_index]; Uiimage * aimage = [uiimage imagenamed: imagename]; [Imagename release]; Int width = aimage. Size. width;Int Height = aimage. Size. height; Cgcolorspaceref colorspace = cgcolorspacecreatedevicergb ();Cgcontextref context = cgbitmapcontextcreate (nil, width, height, 8, 0, colorspace, kc

Code to cut an image into rounded corners

Static void addroundedrecttopath (cgcontextref context, cgrect rect, float ovalwidth, Float ovalheight) { Float FW, FH; If (ovalwidth = 0 | ovalheight = 0 ){ Cgcontextaddrect (context, rect ); Return; } Cgcontextsavegstate (context ); Cgcontexttranslatectm (context, cgrectgetminx (rect), cgrectgetminy (rect )); Cgcontextscalectm (context, ovalwidth, ovalheight ); FW = cgrectgetwidth (rect)/ovalwidth; FH = cgrectgetheight (rect)/ovalheight; Cgcontextmovetopoint (context, FW, FH/2); // start at

Obtain the color value of a certain point in uiview.

-(Uicolor *) colorofpoint :( cgpoint) Point { Unsigned char pixel [4] = {0 }; Cgcolorspaceref colorspace = cgcolorspacecreatedevicergb (); Cgcontextref context = cgbitmapcontextcreate (pixel, 1, 1, 8, 4, colorspace, kcgimagealphapremultipliedlast ); Cgcontexttranslatectm (context,-point. X,-point. y ); [Self. layer renderincontext: Context]; Cgcontextrelease (context ); Cgcolorspacerelstrap (

IOS-common image processing technologies

(context, fw, fh, fw/2, fh, 1); // Top right corner CGContextAddArcToPoint(context, 0, fh, 0, fh/2, 1); // Top left corner CGContextAddArcToPoint(context, 0, 0, fw/2, 0, 1); // Lower left corner CGContextAddArcToPoint(context, fw, 0, fw, fh/2, 1); // Back to lower right CGContextClosePath(context); CGContextRestoreGState(context);}+ (id) createRoundedRectImage:(UIImage*)image size:(CGSize)size{ // the size of CGContextRef int w = size.width; int h = size.height; UIIma

ios-round corner setting performance optimization

bezierPathWithRoundedRect:avatarImageView.bounds cornerRadius:50] addClip]; [image drawInRect:avatarImageView.bounds]; avatarImageView.image = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext();This method can be written in Sdwebimage's completed callback, which is drawn asynchronously in the main thread. can also be encapsulated in the Uiimageview, wrote a dsroundimageview. Background threads are drawn asynchronously and do not block the main thread.5.SDWebImage workin

iOS adds a gradient color for UIView subclasses

+ (uicolor*) Gradientfromcolor: (uicolor*) C1 Tocolor: (uicolor*) c2 withwidth: (cgfloat) Width andheight: (cgfloat) height { Cgsize size = cgsizemake (width, height); Uigraphicsbeginimagecontextwithoptions (size, NO, 0); Cgcontextref context = Uigraphicsgetcurrentcontext (); Cgcolorspaceref colorspace = Cgcolorspacecreatedevicergb (); nsarray* colors = [Nsarray arraywithobjects: (ID) C1. Cgcolor, (ID) c2. Cgcolor, nil]; Cggradie

Add a label or watermark to your iOS image

Just stick to the code.Uiimage+text.h#import Uiimage+text.m#import "Uiimage+text.h" @implementation UIImage (Text)-(uiimage*) AddText: (nsstring*) Text1 XPos: (int) XPos YPos: (int) YPos FontName: (nsstring*) FontName fontSize: (cgfloat) fontSize fontcolor: (uicolor*) fontcolor {int w = self.size.width; int h = self.size.height; Cgcolorspaceref colorspace = Cgcolorspacecreatedevicergb (); Cgcontextref context = Cgbitmapcontextcreate (N

IOS: Gray for pictures

First, in the development of iOS, to the image gray this function is often used, such as product display, the product expired or offline, then the image needs this function. The following method can be used to achieve the purpose./** UIImage: The implementation of the color function (picture gray display) @param sourceimage pictures*/-(UIImage *) Grayimage: (UIImage *) sourceimage{intBitmapinfo =Kcgimagealphanone; intwidth =SourceImage.size.width; intHeight =SourceImage.size.height; Cgcolorspace

IOS multiple ImageView pictures cascade Transparent Area Click event penetration

(NULL! = components) { NSLog (@ "Red:%f Green:%f Blue:%f Alpha:%f", components[0], components[1], components[2], components[ 3]); float Aplphaf = components[3]; if ((Aplphaf >= 0. 5)) { return YES; } } return NO; } #param Click Time to end logical processing -(void) touchesended: (nssetuitouch *> *) touches withevent: (uievent *) event { } -(Uicolor *) Coloratpixel: (cgpoint) point setimage: (Uiimageview *) IV { if (! Cgrect

iOS Development-OpenGL es screenshot

, Gl_renderbuffer_wid Th_oes, backingwidth); 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,

IOS via button Click asynchronously Load Picture _ios

height CGFloat scale = [UIScreen mainscreen].scale; int w = scale * img.size.width; int h = scale * img.size.height; int logowidth = Logo.scale * logo.size.width; int logoheight = Logo.scale * logo.size.height; Cgcolorspaceref colorspace = Cgcolorspacecreatedevicergb (); Create a graphic context with cgbitmapcontextcreate Cgcontextref context = Cgbitmapcontextcreate (NULL, W, H, 8, 4 * W, colorspace

"Windows" BIOS setup in Chinese and English comparison table

that are disabled by the user when the system starts.System Password PasswordSetup Password Setup PasswordPost hotkeys self-Test hotkey: This option is used to specify the hotkey (F2 or F12) that appears on the screen when the Power On Self Test (POST).Chassis intrusionChassis intrusion: This option is used to enable or disable the chassis intrusion detection feature. When set to "Enable-silent", if a chassis intrusion is detected at startup, no warning message is sent. When this option is enab

Two solutions for optimizing and improving computer running speed

it to "2" in the "sdram cas latency" option to speed up.Newer boards support agp4x, and if your graphics card also supports agp4x, activate it at the AGP-4XMode, that is, select Enabled ", this will give full play to the video card capabilities and speed up system startup.Ii. Enable the DMA mode to increase the hard disk speedThe highest transmission rates of hard disks using udma/33, 66, and 100 are 33 Mb/s, 66 Mb/s, and 100 Mb/s. In theory, it is a

[Others] The most comprehensive method to speed up computer boot

, we recommend that you set it to "2" in the "sdram cas latency" option to speed up.Newer boards support agp4x, and if your graphics card also supports agp4x, activate it at the agp-4xmode, that is, select Enabled ", this will give full play to the video card capabilities and speed up system startup.Ii. Enable the DMA mode to increase the hard disk speedThe maximum transmission rate of hard disks using udma/33, 66, and 100 is 33 Mb/s, 66 Mb/s, and 100

Asus laptop System Performance Optimization

memory-quality memory, we recommend that you set it to "2" in the "sdram cas latency" option to speed up. Newer boards support agp4x, and if your graphics card also supports agp4x, activate it at the agp-4xmode, that is, select Enabled ", this will give full play to the video card capabilities and speed up system startup. Ii. Enable the DMA mode to increase the hard disk speed The maximum transmission rate of hard disks using udma/33, 66, and 100 is

Common Hardware glossary! Absolutely authoritative! (Go !) Iv. Optical Drive Glossary

Iv. Optical Drive Glossary    CLV technology: (Constant-Linear-Velocity) Constant line speed reading method. The technology used in an optical drive that is less than 12 times faster. It is used to change the speed of the rotating disc at any time to keep the data transfer rate unchanged. The speed of reading data along the internal direction is much faster than that of the external side.    CAV technology: (Constant-Angular-Velocity) Constant Angular speed reading method. It reads data on the

The system cannot find the optical drive.

, manually add the optical drive accelerator program or other programs found from the network or the disc. The drive of the optical drive is usually included in WIN98 and 95, and does not need to be added. In security mode, you can delete the CDROM option in Device Manager and restart the computer so that the system can find the new hardware and reinstall the drive of the optical drive. 6. Improper CMOS settings If the transmission mode is set incorrectly in the CMOS settings-the old optical

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