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- /*
- File: SeedCFill.c
-
- Contains: This snippet shows how to use the SeedCFill routine
- to create a mask given a source image. As decribed
- on page 71 of Inside Mac volume V, this routine
- computes a destination bitmap image with 1's only
- in the pixels where paint can not leak from the
- starting seed point. This is similar to the paint-
- bucket tool.
-
- Written by: Edgar Lee
-
- 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):
- 7/14/1999 Karl Groethe Updated for Metrowerks Codewarror Pro 2.1
-
-
- */
-
- #include <Dialogs.h>
- #include <Fonts.h>
- #include <Palettes.h>
- #include <QDOffscreen.h>
- #include <Resources.h>
-
- /* Constant Declarations */
-
- #define WWIDTH (176 * 2)
- #define WHEIGHT (106 * 2)
-
- #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 doSeedCFillExample();
-
- void DisposeGrafPort();
- GrafPtr CreateGrafPort();
-
- 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;
- PaletteHandle palette;
-
- SetRect( &rect, WLEFT, WTOP, WLEFT + WWIDTH, WTOP + WHEIGHT );
-
- gWindow = NewCWindow( 0L, &rect, "\pClick anywhere in left image.", true, documentProc,
- (WindowPtr)-1L, true, 0L );
-
- SetPort( gWindow );
-
- /****************************************************************************/
- /* Attach a palette of the default colortable to the window. */
- /* WARNING: SeedCFill may not work if the current gDevice's colortable is */
- /* different than that of the offscreen's colortable. This offscreen is */
- /* the one passed into SeedCFill. To eliminate this problem, we attach a */
- /* palette contaning the same colors used by the offscreen to the window. */
- /****************************************************************************/
-
- palette = NewPalette( 256, GetCTable( 8 ), pmTolerant, 0 );
- SetPalette( gWindow, palette, true );
- }
-
- void doSeedCFillExample( point )
- Point point;
- {
- PicHandle pict; /* Pict used for the source. */
- GWorldPtr source; /* Gworld used to store the pict. */
- PixMapHandle sourcePixMap; /* Handle to the source Gworld. */
- GrafPtr mask; /* BitMap used for creating the mask. */
- int seedH, seedV; /* Pixel position 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. */
-
- /* Load the pict resource to be used for the source. */
- pict = (PicHandle)GetResource( 'PICT', 128 );
-
- /* Define the bounding rect for the source and mask. */
- rect = (**pict).picFrame;
- OffsetRect( &rect, -rect.left, -rect.top );
- rect.right *= 2;
- rect.bottom *= 2;
-
- /* Draw the source image in the window to see what the mask will be created from. */
- DrawPicture( pict, &rect );
- HPurge( (Handle)pict );
-
- /* Return if mouse click was not within the source rect. */
- if (point.h < rect.left || point.h > rect.right ||
- point.v < rect.top || point.v > rect.bottom)
- return;
-
- /* Create a gworld to store the pict. */
- NewGWorld( &source, 8, &rect, GetCTable( 8 ), nil, 0 );
- sourcePixMap = GetGWorldPixMap( source );
-
- /* Draw the pict into the gworld. */
- GetGWorld( ¤tPort, ¤tDevice );
- SetGWorld( source, nil );
- DrawPicture( pict, &rect );
- SetGWorld( currentPort, currentDevice );
-
- /* Allocate a bitmap for the mask. */
- mask = CreateGrafPort( &(**sourcePixMap).bounds );
-
- /* Use the mouse click as the starting seed position. */
- seedH = point.h;
- seedV = point.v;
-
- /* Create a mask from the source, starting from the seed point. */
- SeedCFill( (BitMap *)*sourcePixMap, &(*mask).portBits, &(**sourcePixMap).bounds,
- &(*mask).portRect, seedH, seedV, nil, 0 );
-
- /* Draw a red cross where the mouse was last clicked. */
- ForeColor( redColor );
- MoveTo( rect.left + seedH - 2, seedV );
- LineTo( rect.left + seedH + 2, seedV );
- MoveTo( rect.left + seedH, seedV - 2 );
- LineTo( rect.left + seedH, seedV + 2 );
- ForeColor( blackColor );
-
- OffsetRect( &rect, (**sourcePixMap).bounds.right, 0 );
- EraseRect( &rect );
-
- /* Copy the source to the window while applying the mask. */
- CopyMask( (BitMap *)*sourcePixMap, &((GrafPtr)mask)->portBits, &gWindow->portBits,
- &(**sourcePixMap).bounds, &((GrafPtr)mask)->portRect, &rect );
-
- /* Release the used memory. */
- DisposeGrafPort( (GrafPtr)mask );
- DisposeGWorld( source );
- }
-
- GrafPtr CreateGrafPort( bounds ) /* CreateGrafPort originally written by Forrest Tanaka. */
- Rect *bounds;
- {
- GrafPtr savedPort; /* Saved GrafPtr for later restore. */
- GrafPtr newPort; /* New GrafPort. */
- Rect localBounds; /* Local copy of bounds. */
-
- 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 ) );
-
- if (newPort != nil)
- {
- /* Initialize the new port and make the current port. */
- OpenPort( 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 );
- if (newPort->portBits.baseAddr != nil)
- {
- /* Clean up the new port. */
- newPort->portRect = localBounds;
- ClipRect( &localBounds );
- RectRgn( newPort->visRgn, &localBounds );
- EraseRect( &localBounds );
- }
- else
- {
- /* Allocation failed; deallocate the port. */
- ClosePort( newPort );
- DisposePtr( (Ptr)newPort );
- newPort = nil;
- }
- }
-
- SetPort( savedPort );
- return newPort;
- }
-
- void DisposeGrafPort( doomedPort ) /* DisposeGrafPort originally written by Forrest Tanaka. */
- GrafPtr doomedPort;
- {
- ClosePort( doomedPort );
- DisposePtr( doomedPort->portBits.baseAddr );
- DisposePtr( (Ptr)doomedPort );
- }
-
- void doEventLoop()
- {
- EventRecord event;
- WindowPtr window;
- short clickArea;
- Rect screenRect;
- static Point point = { -1, -1 };
-
- for (;;)
- {
- if (WaitNextEvent( everyEvent, &event, 0, nil ))
- {
- if (event.what == mouseDown)
- {
- clickArea = FindWindow( event.where, &window );
-
- if (clickArea == inDrag)
- {
- screenRect = (**GetGrayRgn()).rgnBBox;
- DragWindow( window, event.where, &screenRect );
- }
- else if (clickArea == inContent)
- {
- if (window != FrontWindow())
- SelectWindow( window );
- else
- {
- point = event.where;
- GlobalToLocal( &point );
- doSeedCFillExample( point );
- }
- }
- else if (clickArea == inGoAway)
- if (TrackGoAway( window, event.where ))
- return;
- }
- else if (event.what == updateEvt)
- {
- window = (WindowPtr)event.message;
- SetPort( window );
-
- BeginUpdate( window );
- doSeedCFillExample( point );
- EndUpdate( window );
- }
- }
- }
- }