NSImage，CFImage常规操作转

对NSImage的一个扩展

作者：Codelif

学习了Cocoa的图片制作，受益很多。知道了图片是怎么画出来的。上层原理。可以对图片的图层操作，如添加一个图层，删除图层，图片的混合，图片的缩放，矢量图图的制作，把字符串图片化，制作pdf的一些原理等。

//
// NSImage+ZCPanel.h
// Flected
//
// Created by zhuzhichao on 08-12-11.
#import <Cocoa/Cocoa.h>
#import "CTGradient.h"
#define MAX_PIXEL_SIZE 600*800
#define PIC_WIDTH 800
#define PIC_HEIGHT 600
//Picture fram
/*
NSBMPFileType,
NsgiFFileType,
NSJPEGFileType,0); background-color: inherit; "> NSPNGFileType,0); background-color: inherit; "> NSjpeg2000FileType*/
@interface NSImage (ZCPanel)
+ (NSImage *) prettyGradientimage:(NSSize)gradientSize; // Generates a 256 by 256 pixel image with a complicated gradient in it.
+ (NSImage *) reflectedImage:(NSImage *)sourceImage amountReflected:(float)fraction;
+ (NSImage *) createScalesImage:(NSImage *)sourceImage flipFlag:(BOOL)bFlip amountReflected:( + (NSImage *) rotateImage:(NSImage*)sourceImage bydegrees:(float)deg;
+ (NSImage *) imageFromCGImageRef:(CGImageRef)image; //FROME CGImageRef to NSImage
- (CGImageRef) nsImagetoCGImageRef;//FROME NSImage to CGImageRef
- (BOOL) setSmoothingEffect; //Set smoothing effect
BOOL) saveImage:(NSImage*)image
saveType:(NSBitmapImageFileType)storageType
properties:(NSDictionary *)properties
ToTarget:(Nsstring *) targePath;
- (CGImageRef)thumbnailForFile: (Nsstring*)name atPath: (Nsstring*)filePath;
@end
// AppController+ZCBundImage.m
#import "NSImage+ZCPanel.h"
float distance(NSPoint aPoint);
enum pixelComponents { red, green, blue, alpha };
#define PI 3.14159265358979323846264338327950288
@implementation NSImage (ZCPanel)
////倒立，深度
+ (NSImage *)reflectedImage:(NSImage *)sourceImage amountReflected:(float)fraction
{
NSImage *reflection = [[NSImage alloc] initWithSize:[sourceImage size]];
[reflection setFlipped:YES];
[reflection lockFocus];
CTGradient *fade = [CTGradient gradientWithBeginningColor:[NSColor colorWithCalibratedWhite:1.0 alpha:0.5] endingColor:[NSColor clearColor]];
[fade fillRect:NSMakeRect(0, 0, [sourceImage size].width, [sourceImage size].height*fraction) angle:90.0];
[sourceImage drawAtPoint:NSMakePoint(0,0) fromrect:NSZeroRect operation:NSCompositeSourceIn fraction:1.0];
[reflection unlockFocus];
return [reflection autorelease];
}
//缩放到目的大小，太小了不缩放添加背景
+ (NSImage *)createScalesImage:(NSImage *)sourceImage flipFlag:(float)fraction
{
//set flipped
[sourceImage setScalesWhenResized:YES];
if(bFlip)
{
[sourceImage setFlipped:YES];
}
//source picture size
NSSize srcSize = [sourceImage size];
unsigned int uiWidth= srcSize.width;
unsigned int uiHeight= srcSize.height;
//target bg picture size
int bgWidth = PIC_WIDTH;
int bgHeight = PIC_HEIGHT;
NSSize tarSize =NSMakeSize(bgWidth, bgHeight);
if(uiWidth>=bgWidth && uiHeight >= bgHeight)
{
[sourceImage setSize:tarSize];
return [[sourceImage copy] autorelease];
if(uiWidth>bgWidth && uiHeight < bgHeight)
[sourceImage setSize:tarSize];
//target bg picture
NSImage *targetimage = [[NSImage alloc] initWithSize:tarSize];
[targetimage lockFocus];
//fill target bg picture,using white color
[[NSColor whiteColor] set];
NSRectFill(NSMakeRect(0, bgWidth, bgHeight*fraction));
//draw
[sourceImage drawAtPoint:NSMakePoint(0,(bgHeight - uiHeight)*0.5) fromrect:NSZeroRect operation:NSCompositeSourceIn fraction:1.0];
[targetimage unlockFocus];
return [targetimage autorelease];
}
if(uiWidth<bgWidth && uiHeight >bgHeight)
//target bg picture
NSImage *targetimage = [[NSImage alloc] initWithSize:tarSize];
[targetimage lockFocus];
ottom-style: none; border-width: initial; border-color: initial; list-style-image: initial; list-style-position: outside !important; border-left-width: 3px; border-left-style: solid; border-left-color: rgb(108,using white color
[[NSColor whiteColor] set];
NSRectFill(NSMakeRect(0, bgWidth*fraction));
//draw
[sourceImage drawAtPoint:NSMakePoint((bgWidth- uiWidth)*0.5, 0) fromrect:NSZeroRect operation:NSCompositeSourceIn fraction:1.0];
[targetimage unlockFocus];
return [targetimage autorelease];
else
//(uiWidth<bgWidth && uiHeight < bgHeight)
//[sourceImage setSize:tarSize];
ottom-style: none; border-width: initial; border-color: initial; list-style-image: initial; list-style-position: outside !important; border-left-width: 3px; border-left-style: solid; border-left-color: rgb(108, bgWidth*fraction));
[sourceImage drawAtPoint:NSMakePoint((bgWidth - uiWidth)*0.5, (bgHeight - uiHeight)*0.5) fromrect:NSZeroRect operation:NSCompositeSourceIn fraction:1.0];
//按照图片的中心旋转90.180.270,360度
float)deg
NSSize srcsize= [sourceImage size];
float srcw = srcsize.width;
float srch= srcsize.height;
float newdeg = 0;
//旋转弧度
//double ratain = ((deg/180) * PI);
NSRect r1;
if(0< deg && deg <=90)
r1 = NSMakeRect(0.5*(srcw -srch), 0.5*(srch-srcw), srch, srcw);
newdeg = 90.0;
if(90< deg && deg <=180)
r1 = NSMakeRect(0, srcw, srch);
newdeg = 180.0;
if(180< deg && deg <=270)
newdeg = 270.0;
if(270< deg && deg <=360)
ottom-style: none; border-width: initial; border-color: initial; list-style-image: initial; list-style-position: outside !important; border-left-width: 3px; border-left-style: solid; border-left-color: rgb(108, srcw);
newdeg = 360;
//draw new image
NSImage *rotated = [[NSImage alloc] initWithSize:[sourceImage size]];
[rotated lockFocus];
NSAffineTransform *transform = [NSAffineTransform transform];
[transform translateXBy:(0.5*srcw) yBy: (0.5*srch)]; //按中心图片旋转
[transform rotateBydegrees:newdeg]; //旋转度数，rotateByradians：使用弧度
[transform translateXBy:(-0.5*srcw) yBy: (-0.5*srch)];
[transform concat];
[[sourceImage bestRepresentationForDevice: nil] drawInRect: r1];//矩形内画图
//[sourceImage drawInRect:r1 fromrect:NSZeroRect operation:NSCompositecopy fraction:1.0];
//[sourceImage drawAtPoint:arge/*NSZeroPoint*/ fromrect:NSMakeRect(arge.x, arge.y,ww ,wh)/*NSZeroRect*/ operation:NSCompositecopy fraction:1.0];
[rotated unlockFocus];
return [rotated autorelease];
}
//save image to file
- (BOOL)saveImage:(NSImage*)image //source image
saveType:(NSBitmapImageFileType)storageType //save type "NSJPEGFileType"
properties:(NSDictionary *)properties //properties "NSImageCompressionFactor = (NSNumber)0.8"
ToTarget:(Nsstring *) targePath //save path
NSData *tempdata;
NSBitmapImageRep *srcImageRep;
BOOL reflag = NO;
[image lockFocus];
srcImageRep = [NSBitmapImageRep imageRepWithData:[image TIFFRepresentation]];
tempdata = [srcImageRep representationUsingType:storageType properties:properties];
reflag = [tempdata writetoFile:targePath atomically:YES];
[image unlockFocus];
return reflag;
// ---------------------------------------------------------------------------------------------------------------------
- (CGImageRef)thumbnailForFile: (Nsstring*)name
atPath: (Nsstring*)filePath
// use ImageIO to get a thumbnail for a file at a given path
CGImageSourceRef isr = NULL;
Nsstring * path = [filePath stringByExpandingTildeInPath];
CGImageRef image = NULL;
// path = [path stringByAppendingPathComponent: name];
// create the CGImageSourceRef
isr = CGImageSourceCreateWithURL((CFURLRef)[NSURL fileURLWithPath: path], NULL);
if (isr)
// create a thumbnail:
// - specify max pixel size
// - create the thumbnail with honoring the EXIF orientation flag (correct transform)
// - always create the thumbnail from the full image (ignore the thumbnail that may be embedded in the image -
// reason: our MAX_ICON_SIZE is larger than existing thumbnail)
image = CGImageSourceCreateThumbnailAtIndex (isr, (CFDictionaryRef)[NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithInt: MAX_PIXEL_SIZE], kCGImageSourceThumbnailMaxPixelSize,255); color: inherit; "> (id)kcfBooleanTrue, kCGImageSourceCreateThumbnailWithTransform,92); margin-top: 0px !important; margin-right: 0px !important; margin-bottom: 0px !important; margin-left: 0px !important; line-height: 14px; list-style-type: decimal; padding-top: 2px; padding-right: 0px; padding-bottom: 2px; padding-left: 0px; "> (id)kcfBooleanTrue, kCGImageSourceCreateThumbnailFromImageAlways,255); color: inherit; "> NULL] );
CFRelease(isr);
return image;
}
+ (NSImage*) imageFromCGImageRef:(CGImageRef)image
NSRect imageRect = NSMakeRect(0.0, 0.0, 0.0);
CGContextRef imageContext = nil;
NSImage* newImage = nil;
// Get the image dimensions.
imageRect.size.height = CGImageGetHeight(image);
imageRect.size.width = CGImageGetWidth(image);
// Create a new image to receive the Quartz image data.
newImage = [[[NSImage alloc] initWithSize:imageRect.size] autorelease];
[newImage lockFocus];
// Get the Quartz context and draw.
imageContext = (CGContextRef)[[NSGraphicsContext currentContext] graphicsPort];
CGContextDrawImage(imageContext, *(CGRect*)&imageRect, image);
[newImage unlockFocus];
return newImage;
- (CGImageRef)nsImagetoCGImageRef//:(NSImage*)image;
NSData * imageData = [self TIFFRepresentation];
CGImageRef imageRef;
if(imageData)
CGImageSourceRef imageSource =
CGImageSourceCreateWithData(
(CFDataRef)imageData, NULL);
imageRef = CGImageSourceCreateImageAtIndex(
imageSource,255); color: inherit; "> return imageRef;
BOOL)setSmoothingEffect
NSBitmapImageRep *rep = [[self representations] objectAtIndex: 0];
NSSize size = NSMakeSize ([rep pixelsWide], [rep pixelsHigh]);
if(size.width >0 && size.height>0)
[self setSize: size];
return YES;
return NO;
// Generates a 256 by 256 pixel image with a complicated gradient in it.
+ (NSImage *) prettyGradientimage:(NSSize)gradientSize
NSImage *newImage = [[self alloc] initWithSize:gradientSize]; // In this case, the pixel dimensions match the image size.
int pixelsWide = gradientSize.width;
int pixelsHigh = gradientSize.height;
NSBitmapImageRep *bitmapRep =
[[NSBitmapImageRep alloc]
initWithBitmapDataPlanes: nil // Nil pointer makes the kit allocate the pixel buffer for us.
pixelsWide: pixelsWide // The compiler will convert these to integers, but I just wanted to make it quite explicit
pixelsHigh: pixelsHigh bitsPerSample: 8
samplesPerPixel: 4 // Four samples, that is: RGBA
hasAlpha: YES
isPlanar: NO // The math can be simpler with planar images, but performance suffers..
colorSpaceName: NSCalibratedRGBColorSpace // A calibrated color space gets us ColorSync for free.
bytesPerRow: 0 // Passing zero means "you figure it out."
bitsPerPixel: 32]; // This must agree with bitsPerSample and samplesPerPixel.
char *imageBytes = [bitmapRep bitmapData]; // -bitmapData returns a void*, not an NSData object ;-)
int row = pixelsHigh;
while(row--)
int col = pixelsWide;
while(col--)
{
int
pixelIndex = 4 * (row * pixelsWide + col);
imageBytes[pixelIndex + red] = rint(fmod(distance(NSMakePoint(col/1.5,(255-row)/1.5)),255.0)); //red
imageBytes[pixelIndex + green] = rint(fmod(distance(NSMakePoint(col/1.5, row/1.5)),0); background-color: inherit; ">// green
imageBytes[pixelIndex + blue] = rint(fmod(distance(NSMakePoint((255-col)/1.5,0); background-color: inherit; ">// blue
imageBytes[pixelIndex + alpha] = 255; // Not doing anything tricky with the Alpha value here...
}
[newImage addRepresentation:bitmapRep];
return [newImage autorelease];
float distance(NSPoint aPoint) // Stole this from some guy named Pythagoras.. Returns the distance of aPoint from the origin.
return sqrt(aPoint.x * aPoint.x + aPoint.y *aPoint.y);
//open selecter file panel
/*static NSArray* openImageFiles()
{
// Get a list of extensions to filter in our NSOpenPanel.
NSOpenPanel* panel = [NSOpenPanel openPanel];
[panel setCanChooseDirectories:YES]; // The user can choose a folder; images in the folder are added recursively.
[panel setCanChooseFiles:YES];
[panel setAllowsMultipleSelection:YES];
if ([panel runModalForTypes:[NSImage imageUnfilteredFileTypes]] == NSOKButton)
return [panel filenames];
return nil;
}*/

NSImage，CFImage常规操作转

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