/*

    File:       AlphaCompositing.c

    Description: This example takes two images and composites them together demonstrating the use of

                 different graphic modes.

                 Test Sample Image : Sample 3a-Beach.jpg and Sample 3b-Penguin w shadow.png

    Author:     QuickTime Engineering, DTS

    Copyright:  © Copyright 1999 - 2002 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

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

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                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)

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

                ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

    Change History (most recent first): <2> 4/22/02 released as dts sample code

                                        <1> 4/1/99 initial release

*/

#include "MacShell.h"

void AlphaComposite( void )

{

    OSErr err = noErr;

    Handle hOpenTypeList = NewHandle(0);

    long   numTypes = 0;

    FSSpec theFSSpec;

    GraphicsImportComponent backgroundImporter = 0, foregroundImporter = 0;

    Rect backgroundBounds, windowBounds, foregroundBounds;

    MatrixRecord matrix;

    RGBColor whiteColor;

    FixedPoint backgroundCenter;

    BuildGraphicsImporterValidFileTypes( hOpenTypeList, &numTypes );

    HLock( hOpenTypeList );

    // prompt for a background image.

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

    if (err) goto bail;

    err = GetGraphicsImporterForFile( &theFSSpec, &backgroundImporter );

    // prompt for a foreground image.

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

    if (err) goto bail;

    err = GetGraphicsImporterForFile( &theFSSpec, &foregroundImporter );

    err = GraphicsImportGetNaturalBounds( backgroundImporter, &backgroundBounds );

    windowBounds = backgroundBounds;

    OffsetRect( &windowBounds, 10, 45 );

    window = NewCWindow( NULL, &windowBounds, "\pAlpha Composite", true, documentProc, (WindowPtr)-1, true, 0);

    // set the graphics port for drawing the first image

    err = GraphicsImportSetGWorld( backgroundImporter, GetWindowPort( window ), NULL );

    // draw the background

    err = GraphicsImportDraw( backgroundImporter );

    pause();

    // center the foreground image over the background image

    // get the native size of the foreground image

    // offset the image to center it

    // set the rectangle in which to draw an image

    err = GraphicsImportGetNaturalBounds( foregroundImporter, &foregroundBounds );

    OffsetRect( &foregroundBounds, 

                (backgroundBounds.right - foregroundBounds.right) / 2,

                (backgroundBounds.bottom - foregroundBounds.bottom) / 2 );

    err = GraphicsImportSetBoundsRect( foregroundImporter,

                                       &foregroundBounds );

    // draw the foreground image over the background image,

    // using the default graphics mode, ditherCopy.

    err = GraphicsImportSetGWorld( foregroundImporter, GetWindowPort( window ), NULL );

    err = GraphicsImportDraw( foregroundImporter );

    pause();

    // redraw the background.

    err = GraphicsImportDraw( backgroundImporter );

    // draw the foreground using the transparent graphics mode, with white transparent.

    whiteColor.red = 0xffff;

    whiteColor.green = 0xffff;

    whiteColor.blue = 0xffff;

    err = GraphicsImportSetGraphicsMode( foregroundImporter,    // graphics importer instance

                                         transparent,           // graphics transfer mode to use for drawing

                                         &whiteColor );         // color to use for blending and transparent operations

    err = GraphicsImportDraw( foregroundImporter );

    pause();

    // redraw the background.

    err = GraphicsImportDraw( backgroundImporter );

    // draw the foreground using the straight alpha graphics mode.

    err = GraphicsImportSetGraphicsMode( foregroundImporter,        // graphics importer instance

                                         graphicsModeStraightAlpha, // graphics transfer mode to use for drawing

                                         NULL );

    err = GraphicsImportDraw( foregroundImporter );

    pause();

    // redraw the background.

    err = GraphicsImportDraw( backgroundImporter );

    // draw the foreground *rotated 30 degrees*, using the straight alpha graphics mode.

    err = GraphicsImportGetMatrix( foregroundImporter, &matrix );

    backgroundCenter.x = Long2Fix( backgroundBounds.right - backgroundBounds.left ) / 2;

    backgroundCenter.y = Long2Fix( backgroundBounds.bottom - backgroundBounds.top ) / 2;

    RotateMatrix( &matrix, Long2Fix(30), backgroundCenter.x, backgroundCenter.y );

    err = GraphicsImportSetMatrix( foregroundImporter, &matrix );

    err = GraphicsImportDraw( foregroundImporter );

bail:

    if ( backgroundImporter ) CloseComponent( backgroundImporter );

    if ( foregroundImporter ) CloseComponent( foregroundImporter );

    if ( hOpenTypeList) DisposeHandle( hOpenTypeList );

}