/*
	File:		ExportFromCGBitmapContext.c
	
	Description: The first part of this sample does what DrawUsingCGImage does, but then this same
                 CGImage is drawn to a CGBitmapContext and exported as a PNG.

	Author:		QuickTime Engineering, DTS

	Copyright: 	© Copyright 2003 - 2005 Apple Computer, Inc. All rights reserved.
	
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	Change History (most recent first): <1> 08/16/05 initial release

*/

#include "MacShell.h"

void ExportFromCGBitmapContext( void )
{
	OSErr  err = noErr;
	Handle hOpenTypeList = NewHandle(0);
	long   numTypes = 0;
	FSSpec theFSSpec;
	Rect   bounds = { 45, 10, 100, 100 };
	GraphicsImportComponent importer = 0;
	GraphicsExportComponent exporter = 0;
	CGImageRef imageRef = 0;
	CGContextRef context = NULL;
	CGRect rect;

	BuildGraphicsImporterValidFileTypes( hOpenTypeList, &numTypes );
	HLock( hOpenTypeList );

	err = GetOneFileWithPreview(numTypes, (OSTypePtr)*hOpenTypeList, &theFSSpec, NULL);
	DisposeHandle( hOpenTypeList );
	if ( err ) return;

	// locate and open a graphics importer component which can be used to draw the
	// selected file. If a suitable importer is not found the ComponentInstance
	// is set to NULL.
	err = GetGraphicsImporterForFile( &theFSSpec,	// specifies the file to be drawn
									  &importer );	// pointer to the returned GraphicsImporterComponent
	                                  
	window = NewCWindow( NULL, &bounds, "\pExport PNG From CGBitmapContext", false, documentProc, (WindowPtr)-1, true, 0);

	// import the image as a CGImage
	err = GraphicsImportCreateCGImage( importer, &imageRef, kGraphicsImportCreateCGImageUsingCurrentSettings );
	if (err) return;

	SizeWindow( window, CGImageGetWidth( imageRef ), CGImageGetHeight( imageRef ), false );
	ShowWindow(window);
    
    // create a Core Graphics Context from the window port
	err = QDBeginCGContext(GetWindowPort(window), &context);
	if (err) return;

	// make a rectangle designating the location and dimensions in user space of the bounding box in which to draw the image
	rect = CGRectMake( 0, 0, CGImageGetWidth( imageRef ), CGImageGetHeight( imageRef ) );

	// draw the image
	CGContextDrawImage( context, rect, imageRef );

    // end the the context we had for the port
	QDEndCGContext(GetWindowPort(window), &context);
	
	// close the importer instance
	CloseComponent(importer);
    
    // open the PNG exporter
    err = OpenADefaultComponent(GraphicsExporterComponentType, kQTFileTypePNG, &exporter);
	if (noErr == err) {
		
        // create a CGBitmapContext to draw into
		CGContextRef bitmapContextRef = NULL;
		CGColorSpaceRef colorSpace;
		
		void  *bitmapData;
		int	  bitmapBytesPerRow = (CGImageGetWidth(imageRef) * 4);
		int	  bitmapByteCount = (bitmapBytesPerRow * CGImageGetHeight(imageRef));
    	
    	colorSpace = CGColorSpaceCreateWithName(kCGColorSpaceGenericRGB);
		bitmapData = malloc(bitmapByteCount);
    	
    	bitmapContextRef = CGBitmapContextCreate(bitmapData, CGImageGetWidth(imageRef), CGImageGetHeight(imageRef), 8, bitmapBytesPerRow, colorSpace, kCGImageAlphaPremultipliedFirst);  
		if (NULL != bitmapContextRef) {
			 UInt32 sizeWritten;
             Boolean isSelected, isReplacing;
			 
			// draw the image
			CGContextDrawImage(bitmapContextRef, rect, imageRef);

	    	err = PutFile("\pSave PNG to:", "\pExported.png", &theFSSpec, &isSelected, &isReplacing);
            if (noErr == err) {	
                
                // set the CGBitmapContext that the graphics exporter will use as its input image
                // you could have also used GraphicsExportSetInputCGImage in this example because
                // we already have a CGImage but that use is pretty obvious
                err = GraphicsExportSetInputCGBitmapContext(exporter, bitmapContextRef);
                
                // set the destination of the export
                err = GraphicsExportSetOutputFile(exporter, &theFSSpec);
                
                // do the export
                err = GraphicsExportDoExport(exporter, &sizeWritten);
            }
        	
            // release the bitmap context
        	CFRelease(bitmapContextRef);
        }
        
        // close the export component
		CloseComponent(exporter);
		
        // free the bits and the color space
		free (bitmapData);
		CGColorSpaceRelease( colorSpace );	
	}
}