StackOverflow2013

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2012-06-12T02:09:41.967
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<ol> <li>Create a new "Cocoa Application" (if you don't know how to create a cocoa application go to <a href="http://cocoadevcentral.com/d/learn_cocoa/" rel="nofollow" title="Cocoa Dev Central">Cocoa Dev Center</a>)</li> <li>Subclass NSView (if you don't know how to subclass a view <a href="http://developer.apple.com/library/ios/documentation/IDEs/Conceptual/xcode_quick_start/Xcode_Quick_Start_Guide.pdf" rel="nofollow">read section "Create the NSView Subclass"</a>)</li> <li>Set your NSWindow to size 400x400 on interface builder</li> <li><p>Use this code in your NSView</p> <pre><code>#import "MyView.h" @implementation MyView #define WIDTH 400 #define HEIGHT 400 #define SIZE (WIDTH*HEIGHT) #define BYTES_PER_PIXEL 2 #define BITS_PER_COMPONENT 5 #define BITS_PER_PIXEL 16 - (id)initWithFrame:(NSRect)frame { self = [super initWithFrame:frame]; if (self) { // Initialization code here. } return self; } - (void)drawRect:(NSRect)dirtyRect { // Get current context CGContextRef context = (CGContextRef)[[NSGraphicsContext currentContext] graphicsPort]; // Colorspace RGB CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB(); // Pixel Matrix allocation unsigned short *pixels = calloc(SIZE, sizeof(unsigned short)); // Random pixels will give you a non-organized RAINBOW for (int i = 0; i < WIDTH; i++) { for (int j = 0; j < HEIGHT; j++) { pixels[i+ j*HEIGHT] = arc4random() % USHRT_MAX; } } // Provider CGDataProviderRef provider = CGDataProviderCreateWithData(nil, pixels, SIZE, nil); // CGImage CGImageRef image = CGImageCreate(WIDTH, HEIGHT, BITS_PER_COMPONENT, BITS_PER_PIXEL, BYTES_PER_PIXEL*WIDTH, colorSpace, kCGImageAlphaNoneSkipFirst, // xRRRRRGGGGGBBBBB - 16-bits, first bit is ignored! provider, nil, //No decode NO, //No interpolation kCGRenderingIntentDefault); // Default rendering // Draw CGContextDrawImage(context, self.bounds, image); // Once everything is written on screen we can release everything CGImageRelease(image); CGColorSpaceRelease(colorSpace); CGDataProviderRelease(provider); } @end </code></pre></li> </ol>
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1. POHow can I display an array of pixels on a NSWindow?
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1. USGabrielOshiro
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1. POHow can I display an array of pixels on a NSWindow?
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