/*
	File:		DrawUsingCGImage.c
	
	Description: This sample simply draws an image using Core Graphics with a CGImage returned from the
                 Graphics Importer Component.

	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 DrawUsingCGImage( void )
{
	OSErr  err = noErr;
	Handle hOpenTypeList = NewHandle(0);
	long   numTypes = 0;
	FSSpec theFSSpec;
	Rect   bounds = { 45, 10, 100, 100 };
	GraphicsImportComponent importer = 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, "\pDraw Using CGImage", 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 );
}