IPhone SDK: How to create an image from raw data

Question

Creating a UIImage from some form of bitmap file format is easy, whether you let UIImage load the file itself or create it with an NSData. But what if you have raw bitmap data in memory and you want to create an image?
In Cocoa NSBitmapImageRep can be created by passing it a pointer to a block of memory and the relevant heigh, width, bit depth etc. information. From that you can easily create an NSImage. There doesn't seem to be anything equivalent on the iPhone. CGImage can be created but it looks like you have to write a CGImageProvider. CGBitmapContextCreate takes a void * to a block of memory. Does it clear that block?
Is there a good way to do this?

Answer 1

ElNono wrote:
You can't do RGB565 on a CGImageRef/CGContextRef. The only 5bpp modes supported are 1555 ARGB or 5551 RGBA. If you just need to display the image, use OpenGL. One of the supported texture formats is RGB565. If you need to save the image then you're going to have to pre-convert it to RGB888.
hi ElNono , i have test the RGB888 data now , the image can show , but another problem is the image just like serveral picture over lap together , also is blurred , my code is here:
const size_t width = 1024;
const size_t height = 768;
const size_t bitsPerComponent = 8;
const size_t bitsPerPixel = 32;
const size_t bytesPerRow = (bitsPerPixel * width)/8;
CGBitmapInfo bitmapInfo = kCGImageAlphaPremultipliedLast;
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
NSString *imagePath = [[NSBundle mainBundle] pathForResource: @"Test" ofType: @"rgb"];
NSFileHandle* file = [NSFileHandle fileHandleForReadingAtPath:imagePath];
NSData* imageData = [file readDataToEndOfFile];
CGContextRef context = CGBitmapContextCreate((void*)[imageData bytes], width, height, bitsPerComponent, bytesPerRow, colorSpace, bitmapInfo);
CGImageRef imageRef = CGBitmapContextCreateImage (context);
UIImage*rawImage = [UIImage imageWithCGImage:imageRef];
CGColorSpaceRelease(colorSpace);
CGContextRelease(context);
CGImageRelease(imageRef);