使用bitbltmasked去除图形白色区域,使之变透明（源代码）

/*
 ============================================================================
 Name  : TestMaskAppView.h
 Author   :
 Copyright   : Your copyright notice
 Description : Declares view class for application.
 ============================================================================
 */

#ifndef __TESTMASKAPPVIEW_h__
#define __TESTMASKAPPVIEW_h__

// INCLUDES
#include <coecntrl.h>

// CLASS DECLARATION
class CTestMaskAppView : public CCoeControl
 {
public:
 static CTestMaskAppView* NewL(const TRect& aRect);
 static CTestMaskAppView* NewLC(const TRect& aRect);
 virtual ~CTestMaskAppView();

public:
 void Draw(const TRect& aRect) const;
 virtual void SizeChanged();
 virtual void HandlePointerEventL(const TPointerEvent& aPointerEvent);
 void LoadBitmap();
private:
 void ConstructL(const TRect& aRect);
 CTestMaskAppView();
private:
 CFbsBitmap* iBitmapBack;
 CFbsBitmap* iBitmap;
 CFbsBitmap* iMaskBitmap;
 TRect iRect;
 CFbsBitmap* iBitmap1;
 CFbsBitmap* iMaskBitmap1;
 TRect iRect1;
 };

#endif // __TESTMASKAPPVIEW_h__
// End of File

 

 

/*
 ============================================================================
 Name  : TestMaskAppView.cpp
 Author   :
 Copyright   : Your copyright notice
 Description : Application view implementation
 ============================================================================
 */

// INCLUDE FILES
#include <coemain.h>
#include "TestMaskAppView.h"

// ============================ MEMBER FUNCTIONS ===============================
CTestMaskAppView* CTestMaskAppView::NewL(const TRect& aRect)
 {
 CTestMaskAppView* self = CTestMaskAppView::NewLC(aRect);
 CleanupStack::Pop(self);
 return self;
 }
CTestMaskAppView* CTestMaskAppView::NewLC(const TRect& aRect)
 {
 CTestMaskAppView* self = new (ELeave) CTestMaskAppView;
 CleanupStack::PushL(self);
 self->ConstructL(aRect);
 return self;
 }
void CTestMaskAppView::ConstructL(const TRect& aRect)
 {
 CreateWindowL();
 LoadBitmap();
 SetRect(aRect);
 ActivateL();
 }
CTestMaskAppView::CTestMaskAppView()
 {
 // No implementation required
 }
CTestMaskAppView::~CTestMaskAppView()
 {
 delete iBitmapBack;
 delete iBitmap;
 delete iMaskBitmap;
 delete iBitmap1;
 delete iMaskBitmap1;
 }
void CTestMaskAppView::Draw(const TRect& /*aRect*/) const
 {
 CWindowGc& gc = SystemGc();
 TRect drawRect(Rect());
 gc.Clear(drawRect);
 gc.BitBlt(Position(),iBitmapBack);
 gc.BitBltMasked(TPoint(5,305),iBitmap,iRect,iMaskBitmap,ETrue);   //掩码图——白底黑图 ，关键之一
 gc.BitBltMasked(TPoint(225,305),iBitmap1,iRect1,iMaskBitmap1,EFalse); //掩码图——黑底白图
 }
void CTestMaskAppView::SizeChanged()
 {
 DrawNow();
 }

void CTestMaskAppView::HandlePointerEventL(const TPointerEvent& aPointerEvent)
 {
 CCoeControl::HandlePointerEventL(aPointerEvent);
 }
void CTestMaskAppView::LoadBitmap()
 {
 _LIT(multiBitmapFile,"c://Data//mbm//TestMask.mbm");
 iBitmapBack = new (ELeave) CFbsBitmap();
 iBitmap = new (ELeave) CFbsBitmap();
 iMaskBitmap = new (ELeave) CFbsBitmap();
 iBitmap1 = new (ELeave) CFbsBitmap();
 iMaskBitmap1 = new (ELeave) CFbsBitmap();
 User::LeaveIfError(iBitmapBack->Load(multiBitmapFile,0,ETrue));
 User::LeaveIfError(iBitmap->Load(multiBitmapFile,1,ETrue));
 User::LeaveIfError(iMaskBitmap->Load(multiBitmapFile,2,ETrue));
 User::LeaveIfError(iBitmap1->Load(multiBitmapFile,3,ETrue));
 User::LeaveIfError(iMaskBitmap1->Load(multiBitmapFile,4,ETrue));
 iRect = TRect (TPoint(0,0),iBitmap->SizeInPixels());       //关键之2：
 iRect1 = TRect (TPoint(0,0),iBitmap1->SizeInPixels());
 }
// End of File