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- /*
- File: CalcCMask & CalcMask.c
-
- Contains: This snippet shows how to use both CalcCMask or
- CalcMask to create a mask given a source bitmap
- image. As decribed on pages IV-24 and V-72 of
- Inside Mac, the two routines compute a destination
- bitmap image with 1's only in the pixels where
- paint can not leak from any of the outer edges.
- This is similar to the lasso tool found in many
- drawing apps.
-
- Written by: EL
-
- Copyright: Copyright © 1992-1999 by Apple Computer, Inc., All Rights Reserved.
-
- You may incorporate this Apple sample source code into your program(s) without
- restriction. This Apple sample source code has been provided "AS IS" and the
- responsibility for its operation is yours. You are not permitted to redistribute
- this Apple sample source code as "Apple sample source code" after having made
- changes. If you're going to re-distribute the source, we require that you make
- it clear in the source that the code was descended from Apple sample source
- code, but that you've made changes.
-
- Change History (most recent first):
- 08/2000 JM Carbonized, non-Carbon code is commented out
- for demonstration purposes.
- 7/8/1999 KG Updated for Metrowerks Codewarror Pro 2.1
-
-
- */
- #include "CarbonPrefix.h"
- #include <Dialogs.h>
- #include <Fonts.h>
- #include <QDOffscreen.h>
- #include <Resources.h>
- /* Constant Declarations */
-
- #define WWIDTH 176
- #define WHEIGHT 106
-
- //#define WLEFT (((qd.screenBits.bounds.right - qd.screenBits.bounds.left) - WWIDTH) / 2)
- //#define WTOP (((qd.screenBits.bounds.bottom - qd.screenBits.bounds.top) - WHEIGHT) / 2)
-
- /* Global Variable Definitions */
-
- WindowPtr gWindow;
-
- void initMac();
- void createWindow();
- void doCalcCMaskExample();
-
- void DisposeGrafPort(GrafPtr ptr);
- GrafPtr CreateGrafPort(Rect *rect);
-
- void doEventLoop();
-
- void main(void)
- {
- initMac();
-
- createWindow();
-
- doEventLoop();
- }
-
- void initMac()
- {
- /*MaxApplZone();
-
- InitGraf( &qd.thePort );
- InitFonts();
- InitWindows();
- InitMenus();
- TEInit();
- InitDialogs( nil );*/
- InitCursor();
- FlushEvents( 0, everyEvent );
- }
-
- void createWindow()
- {
- Rect rect;
- BitMap bitMap;
- int top, left;
-
- GetQDGlobalsScreenBits(&bitMap);
-
- left = (((bitMap.bounds.right - bitMap.bounds.left) - WWIDTH) / 2);
- top = (((bitMap.bounds.bottom - bitMap.bounds.top) - WHEIGHT) / 2);
-
- //SetRect( &rect, WLEFT, WTOP, WLEFT + WWIDTH, WTOP + WHEIGHT );
- SetRect( &rect, left, top, left + WWIDTH, top + WHEIGHT );
-
- gWindow = NewCWindow( 0L, &rect, "\pCalc-C-Mask", true, documentProc,
- (WindowPtr)-1L, true, 0L );
-
- //SetPort( gWindow );
- SetPortWindowPort( gWindow );
- }
-
- #define COLOR_VERSION
-
- void doCalcCMaskExample()
- {
- PicHandle pict; /* B/W Pict used to create mask. */
- GWorldPtr gworld; /* Gworld used for CopyMask source. */
- //GrafPtr mask; /* Mask created by CalcCMask. */
- GrafPtr sourceForMask; /* Bitmap of pict image used for creating mask. */
- GrafPtr oldPort; // Old port, saved then restored
- RGBColor seedColor; /* Color used to determine the mask. */
- Rect rect; /* Bounding rect of mask and source. */
- CGrafPtr currentPort; /* Saved CGrafPtr for later restore. */
- GDHandle currentDevice; /* Saved device for later restore. */
- Rect tempRect1, tempRect2; // Used for carbonization
- OSErr err = noErr;
- GWorldPtr newMask;
-
- GetPort(&oldPort);
-
- /* Load the pict resource to be used for the mask. */
- pict = (PicHandle)GetResource( 'PICT', 128 );
-
- /* Define the bounding rect for the source and mask bitmap. */
- rect = (**pict).picFrame;
- OffsetRect( &rect, -rect.left, -rect.top );
-
- /* Allocate the source bitmap for which the mask will be created from. */
- sourceForMask = CreateGrafPort( &rect );
-
- /* Create the source bitmap's image by using the pict. */
- SetPort( sourceForMask );
- DrawPicture( pict, &rect );
- //SetPort( gWindow );
- SetPortWindowPort( gWindow );
-
- /* Release the memory used by the pict. */
- ReleaseResource( (Handle)pict );
-
- /* Copy the source image to the window to see what the mask was created from. */
- /*CopyBits( &sourceForMask->portBits, &gWindow->portBits,
- &sourceForMask->portRect, &rect, srcCopy, nil );*/
- CopyBits(GetPortBitMapForCopyBits(sourceForMask), GetPortBitMapForCopyBits(GetWindowPort(gWindow)),
- GetPortBounds(sourceForMask, &tempRect1), &rect, srcCopy, nil );
-
- /* Allocate the bitmap for the mask. */
- //mask = CreateGrafPort( &sourceForMask->portRect );
- GetGWorld( ¤tPort, ¤tDevice );
- NewGWorld(&newMask, 1, GetPortBounds(sourceForMask, &tempRect1), nil, nil, 0);
- SetGWorld( newMask, nil );
- EraseRect( &tempRect1 );
-
- GetPortBounds(sourceForMask, &tempRect1);
- GetPortBounds(newMask, &tempRect2);
- LockPixels(GetPortPixMap(sourceForMask));
- LockPixels(GetGWorldPixMap(newMask));
-
- #ifdef COLOR_VERSION
- /* Create a mask from the source bitmap of all colors that match the seedColor. */
- seedColor.red = seedColor.green = seedColor.blue = 0;
-
- /*CalcCMask( &sourceForMask->portBits, &mask->portBits, &sourceForMask->portRect,
- &mask->portRect, &seedColor, nil, 0 );*/
-
- CalcCMask( (BitMap *) *(GetPortPixMap(sourceForMask)), (BitMap *)*(GetPortPixMap(newMask)), &tempRect1, &tempRect2,
- &seedColor, nil, 0);
-
- #else
-
- /*CalcMask( &sourceForMask->portBits.baseAddr, &mask->portBits.baseAddr,
- sourceForMask->portBits.rowBytes, mask->portBits.rowBytes,
- sourceForMask->portRect.bottom - sourceForMask->portRect.top,
- sourceForMask->portBits.rowBytes >> 1 );*/
- // This is not recommended since the ports are all color ports under Carbon
- GetPortBounds(sourceForMask, &tempRect1);
- CalcMask( (*(GetPortPixMap(sourceForMask)))->baseAddr, (*(GetGWorldPixMap(newMask)))->baseAddr,
- (*(GetPortPixMap(sourceForMask)))->rowBytes, (*(GetPortPixMap(newMask)))->rowBytes,
- tempRect1.bottom - tempRect1.top, (*(GetPortPixMap(sourceForMask)))->rowBytes >> 1);
- #endif
-
-
- UnlockPixels(GetPortPixMap(sourceForMask));
- UnlockPixels(GetPortPixMap(newMask));
- SetGWorld( currentPort, currentDevice );
-
- // Create a gworld of a blue rectangle for the CopyMask source.
- //GetGWorld( ¤tPort, ¤tDevice );
- err = NewGWorld( &gworld, 8, &rect, nil, nil, 0 );
- //SetPort( (GrafPtr)gworld );
- SetGWorld( gworld, nil );
- ForeColor( blueColor );
- PaintRect( &rect );
- SetGWorld( currentPort, currentDevice );
-
- // Now draw the blue rectangle with its mask.
- //OffsetRect( &rect, sourceForMask->portRect.right, 0 );
- OffsetRect( &rect, GetPortBounds(sourceForMask, &tempRect1)->right, 0 );
- //CopyMask( (BitMap*)&(*gworld).portPixMap, &mask->portBits, &gWindow->portBits,
- // &sourceForMask->portRect, &mask->portRect, &rect );
- //SetPortWindowPort(gWindow);
- GetGWorld( ¤tPort, ¤tDevice );
- SetGWorld(GetWindowPort(gWindow), nil);
- LockPixels(GetPortPixMap(gworld));
- LockPixels(GetPortPixMap(newMask));
- CopyMask( (BitMap*)*(GetPortPixMap(gworld)), (BitMap *)*(GetPortPixMap(newMask)), GetPortBitMapForCopyBits(GetWindowPort(gWindow)),
- GetPortBounds(sourceForMask, &tempRect1), GetPortBounds(newMask, &tempRect2), &rect );
- UnlockPixels(GetPortPixMap(gworld));
- UnlockPixels(GetGWorldPixMap(newMask));
-
- // Release the used memory.
- DisposeGrafPort( sourceForMask );
- //DisposeGrafPort( mask );
- DisposeGWorld( newMask );
- DisposeGWorld( gworld );
- SetPort( oldPort );
- }
-
- GrafPtr CreateGrafPort( Rect *bounds ) /* CreateGrafPort originally written by Forrest Tanaka. */
- {
- GrafPtr savedPort; /* Saved GrafPtr for later restore. */
- GrafPtr newPort; /* New GrafPort. */
- Rect localBounds; /* Local copy of bounds. */
- RgnHandle rgnHandle = NewRgn(); // Used for carbonization
-
- GetPort( &savedPort );
-
- /* Set the top-left corner of bounds to (0,0). */
- localBounds = *bounds;
- OffsetRect( &localBounds, -bounds->left, -bounds->top );
-
- /* Allocate a new GrafPort. */
- //newPort = (GrafPtr)NewPtrClear( sizeof( GrafPort ) );
- newPort = CreateNewPort();
-
- if (newPort != nil)
- {
- /* Initialize the new port and make the current port. */
- //OpenPort( newPort );
- SetPort( newPort);
-
- /* Initialize and allocate the bitmap. */
- /*newPort->portBits.bounds = localBounds;
- newPort->portBits.rowBytes = ((localBounds.right + 15) >> 4) << 1;
- newPort->portBits.baseAddr = NewPtrClear( newPort->portBits.rowBytes *
- (long)localBounds.bottom );*/
-
- LockPixels(GetPortPixMap(newPort));
-
- (*(GetPortPixMap(newPort)))->bounds = localBounds;
- (*(GetPortPixMap(newPort)))->rowBytes = ((localBounds.right + 15) >> 4) <<1;
- (*(GetPortPixMap(newPort)))->baseAddr = NewPtrClear((*(GetPortPixMap(newPort)))->rowBytes *
- (long)localBounds.bottom );
-
- UnlockPixels(GetPortPixMap(newPort));
-
- //if (newPort->portBits.baseAddr != nil)
- if (GetPortBitMapForCopyBits(newPort)->baseAddr != nil)
- {
- /* Clean up the new port. */
- //newPort->portRect = localBounds;
- SetPortBounds(newPort, &localBounds);
- ClipRect( &localBounds );
- //RectRgn( newPort->visRgn, &localBounds );
- RectRgn( GetPortVisibleRegion(newPort, rgnHandle), &localBounds );
- EraseRect( &localBounds );
- }
- else
- {
- /* Allocation failed; deallocate the port. */
- /*ClosePort( newPort );
- DisposePtr( (Ptr)newPort );*/
- DisposePort( newPort );
- newPort = nil;
- }
- }
-
- DisposeRgn(rgnHandle);
- SetPort( savedPort );
- return newPort;
- }
-
- void DisposeGrafPort( GrafPtr doomedPort ) /* DisposeGrafPort originally written by Forrest Tanaka. */
- {
- //ClosePort( doomedPort );
- //DisposePtr( doomedPort->portBits.baseAddr );
- DisposePtr( GetPortBitMapForCopyBits(doomedPort)->baseAddr );
- //DisposePtr( (Ptr)doomedPort );
- DisposePort( doomedPort );
- }
- void doEventLoop()
- {
- EventRecord event;
- WindowPtr window;
- short clickArea;
- Rect screenRect;
-
- for (;;)
- {
- if (WaitNextEvent( everyEvent, &event, 0, nil ))
- {
- if (event.what == mouseDown)
- {
- clickArea = FindWindow( event.where, &window );
-
- if (clickArea == inDrag)
- {
- //screenRect = (**GetGrayRgn()).rgnBBox;
- GetRegionBounds(GetGrayRgn(), &screenRect);
- DragWindow( window, event.where, &screenRect );
- }
- else if (clickArea == inContent)
- {
- if (window != FrontWindow())
- SelectWindow( window );
- }
- else if (clickArea == inGoAway)
- if (TrackGoAway( window, event.where ))
- return;
- }
- else if (event.what == updateEvt)
- {
- window = (WindowPtr)event.message;
- //SetPort( window );
- SetPortWindowPort( window );
-
- BeginUpdate( window );
- doCalcCMaskExample();
- EndUpdate( window );
- }
- }
- }
- }