/*

    File:       Offscreen.cp

    Contains:   Class to help with offscreen drawing.

    Version:    Mac OS X

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*/

#include "AppearanceSamplePrefix.h"

#if !BUILDING_FOR_CARBON_8

    #include <Carbon/Carbon.h>

#else

    #include <Carbon.h>

#endif

#include "Offscreen.h"

Offscreen::Offscreen()

{

    fWorld = nil;

    fSavePort = nil;

    fSaveDevice = nil;

    SetRect( &fBounds, 0, 0, 0, 0 );

}

Offscreen::~Offscreen()

{

}

void

Offscreen::StartDrawing( const Rect& bounds, Boolean copyDest )

{

    QDErr               err;

    Rect                globalRect;

    ThemeDrawingState   state;

    fBounds = bounds;

    GetGWorld( &fSavePort, &fSaveDevice );

    globalRect = fBounds;

    LocalToGlobal( &rectTopLeft( globalRect ) );

    LocalToGlobal( &rectBotRight( globalRect ) );

    err = NewGWorld( &fWorld, 0, &globalRect, nil, nil, 0 );

    if ( err == noErr )

    {

        GetThemeDrawingState( &state );

        SetGWorld( fWorld, nil );

        SetOrigin( fBounds.left, fBounds.top );

        SetThemeDrawingState( state, true );

        LockPixels( GetGWorldPixMap( fWorld ) );

        EraseRect( &fBounds );

        TextFont( GetPortTextFont( fSavePort ) );

        TextSize( GetPortTextSize( fSavePort ) );

        TextFace( GetPortTextFace( fSavePort ) );

        TextMode( GetPortTextMode( fSavePort ) );

        if ( copyDest )

        {

            Rect        portRect;

            GetPortBounds( fWorld, &portRect ); 

            CopyBits( (BitMap*)*GetPortPixMap( fSavePort ), (BitMap*)*GetPortPixMap( fWorld ),

                &fBounds, &portRect, srcCopy, nil );

        }

    }

    else

        fWorld = nil; // make sure

}

void

Offscreen::EndDrawing()

{

    ThemeDrawingState   state;

    Rect                portRect;

    if ( fWorld == nil ) return;

    SetOrigin( 0, 0 );

    SetGWorld( fSavePort, fSaveDevice );

    GetThemeDrawingState( &state );

    NormalizeThemeDrawingState();

    GetPortBounds( fWorld, &portRect ); 

    CopyBits( (BitMap*)*GetPortPixMap( fWorld ), (BitMap*)*GetPortPixMap( fSavePort ),

            &portRect, &fBounds, srcCopy, NULL );

    UnlockPixels( GetGWorldPixMap( fWorld ) );

    DisposeGWorld( fWorld );

    fWorld = nil;

    SetThemeDrawingState( state, true );

}

void

Offscreen::EndDrawingAndBlend( const RGBColor& opColor )

{

    ThemeDrawingState   state;

    Rect                portRect;

    if ( fWorld == nil ) return;

    SetOrigin( 0, 0 );

    SetGWorld( fSavePort, fSaveDevice );

    GetThemeDrawingState( &state );

    NormalizeThemeDrawingState();

    OpColor( &opColor );

    GetPortBounds( fWorld, &portRect ); 

    CopyBits( (BitMap*)*GetPortPixMap( fWorld ), (BitMap*)*GetPortPixMap( fSavePort ),

            &portRect, &fBounds, blend, NULL );

    UnlockPixels( GetGWorldPixMap( fWorld ) );

    DisposeGWorld( fWorld );

    fWorld = nil;

    SetThemeDrawingState( state, true );

}