Re: Getting iPod icon, was Getting the network Machine Icon
Re: Getting iPod icon, was Getting the network Machine Icon
- Subject: Re: Getting iPod icon, was Getting the network Machine Icon
- From: Jean-Daniel Dupas <email@hidden>
- Date: Fri, 23 Jan 2009 18:33:12 +0100
Le 23 janv. 09 à 17:34, Dave a écrit :
Hi Jean,
On 23 Jan 2009, at 13:56, Jean-Daniel Dupas wrote:
An icns file can be opened using NSImage methods.
Then choose the representation you need and convert it to JPEG as
you would do with any image.
If you want to go the "hard" way (that is not that hard):
Use ReadIconFromFSRef() to load the icns file.
Convert it into an FSRef using GetIconRefFromIconFamilyPtr().
And then draw it using PlotIconRefInContext().
Thanks for this. After looking around, I decided to do it the 'hard"
way, since I already have most of the wrapper code I can steal from
another module.
I have a question on this through. How do I fill in the parameters
to the GetIconRefFromIconFamilyPtr() call? This is my code so far:
(There may be a few typeo's in this, but it compiles ok)
myIconFamilyHandle = NULL;
myOSErr = ReadIconFromFSRef(&myFSRef,&myIconFamilyHandle);
if (myOSErr != noErr)
goto Error;
myOSErr =
GetIconRefFromIconFamilyPtr
(*myIconFamilyHandle,GetHandleSize(myIconFamilyHandle),&myIconRef);
if (myOSErr != noErr)
goto Error;
look fine to me.
myBitMapInfo = kCGImageAlphaPremultipliedLast;
myImageWidth = 64;
myImageHeight = 64;
myBitsPerComponent = 8;
myNumberOfComponents = 4;
myRowBytes = COMPUTE_BEST_BYTES_PER_ROW(myImageWidth *
(myBitsPerComponent / 8) * myNumberOfComponents);
myImageBufferPtr = malloc(myImageHeight, myRowBytes);
myColorSpaceRef = GCColorSpaceCreateWithName(kCGColorSpaceGenericRGB);
myBitMapContextRef =
CGBitmapContextCreate
(myImageBufferPtr
,myImageWidth,myImageHeight,myBitsPerComponent,myRowBytes,
myColorSpaceRef, myBitMapInfo);
CGContextClearRect(myBitMapContextRef,0,0,myWidth, myImageHeight)
myImageRect.origin.x = 0;
myImageRect.origin.y = 0;
myImageRect.size.width = myImageWidth;
myImageRect.size.height = myImageHeight;
myLabelRGBColor.red = 0;
myLabelRGBColor.green = 0;
myLabelRGBColor.blue = 0;
myOSErr =
PlotIconRefInContext
(myBitMapContextRef,&myImageRect,kAlignNone,kTransformNone,
myLabelRGBColor,kPlotIconRefNormalFlags,myIconRef);
What should "myLabelRGBColor" be set to?
I think you can pass NULL for the label color.
Also at this point, I'd like to get a pointer to the Pixel buffer in
the CGContext and return this. The code I already have will write
the JPEG file, all I need is a copy of the Pixel Data? Is there a
way to do this?
myImageBufferPtr is the pixel buffer.
To create the image, you can also use an NSImage,
NSImage *img = [[NSImage alloc] initWithSize:NSMakeSize(myImageWidth,
myImageHeight)];
[img lockFocus]
CGContextRef ctxt = [[NSGraphicsContext currentContext] graphicPort];
// draw
[img unlockFocus]
And now, use NSImage function to save it as a JPEG. It's easier than
dealing with all the bitmap stuff.
An other way may be to use CGBitmapContextCreateImage() to create a
CGImageRef from your context, and then use ImageIO
(CGImageDestinationRef) to export your image.
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