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- // Graphics Importer and Exporter Samples
- // This example takes two images and composites them together
- // demonstrating the use of different graphic modes
- // Originally written by Sam Bushell for QuickTime "Live" '99
- // WWDC 2000 Introduction to QuickTime
-
- #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;
- WindowPtr window = NULL;
- 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);
-
- // Step 1. Insert DrawBackground.clp here...
-
-
- 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
- // Step 2. Insert CenterForeground.clp here...
-
- // 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;
- // Step 3. Insert SetGraphicsMode.clp here...
-
- err = GraphicsImportDraw( foregroundImporter );
-
- pause();
-
- // redraw the background.
- err = GraphicsImportDraw( backgroundImporter );
-
- // draw the foreground using the straight alpha graphics mode.
- // Step 4. Insert SetGraphicsModeAlpha.clp here...
-
- err = GraphicsImportDraw( foregroundImporter );
-
- pause();
-
- // redraw the background.
- err = GraphicsImportDraw( backgroundImporter );
-
- // draw the foreground *rotated 30 degrees*, using the straight alpha graphics mode.
- // Step 5. Insert Rotate.clp here...
-
-
- bail:
- if ( backgroundImporter ) CloseComponent( backgroundImporter );
- if ( foregroundImporter ) CloseComponent( foregroundImporter );
- if ( hOpenTypeList) DisposeHandle( hOpenTypeList );
- }
-