/*

    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.

    Disclaimer: IMPORTANT:  This Apple software is supplied to you by Apple Computer, Inc.

                ("Apple") in consideration of your agreement to the following terms, and your

                use, installation, modification or redistribution of this Apple software

                constitutes acceptance of these terms.  If you do not agree with these terms,

                please do not use, install, modify or redistribute this Apple software.

                In consideration of your agreement to abide by the following terms, and subject

                to these terms, Apple grants you a personal, non-exclusive license, under AppleÕs

                copyrights in this original Apple software (the "Apple Software"), to use,

                reproduce, modify and redistribute the Apple Software, with or without

                modifications, in source and/or binary forms; provided that if you redistribute

                the Apple Software in its entirety and without modifications, you must retain

                this notice and the following text and disclaimers in all such redistributions of

                the Apple Software.  Neither the name, trademarks, service marks or logos of

                Apple Computer, Inc. may be used to endorse or promote products derived from the

                Apple Software without specific prior written permission from Apple.  Except as

                expressly stated in this notice, no other rights or licenses, express or implied,

                are granted by Apple herein, including but not limited to any patent rights that

                may be infringed by your derivative works or by other works in which the Apple

                Software may be incorporated.

                The Apple Software is provided by Apple on an "AS IS" basis.  APPLE MAKES NO

                WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED

                WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR

                PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN

                COMBINATION WITH YOUR PRODUCTS.

                IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR

                CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE

                GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

                ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION

                OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER UNDER THEORY OF CONTRACT, TORT

                (INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN

                ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

    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 );  

    }

}