bitmapmethods.cpp

SYMBIAN GPS NMEA协议实现

// Copyright (c) 2000, Nokia Mobile Phones. All rights reserved.

#include "bitmapmethods.h"
#include <eikenv.h>
#include <fbs.h>


CFbsBitGc* NBitmapMethods::CreateGraphicsContextLC(CFbsBitmapDevice& aBitmapDevice)
	{
	CFbsBitGc* graphicsContext = NULL;
	User::LeaveIfError(aBitmapDevice.CreateContext(graphicsContext));
	CleanupStack::PushL(graphicsContext);
	return graphicsContext;
	}


CFbsBitGc* NBitmapMethods::CreateGraphicsContextL(CFbsBitmapDevice& aBitmapDevice)
	{
	CFbsBitGc* gc = CreateGraphicsContextLC(aBitmapDevice);
	CleanupStack::Pop(gc);
	return gc;
	}


CFbsBitmapDevice* NBitmapMethods::CreateBitmapDeviceLC(CFbsBitmap& aBitmap)
	{
	CFbsBitmapDevice* bitmapDevice = CFbsBitmapDevice::NewL(&aBitmap);
	CleanupStack::PushL(bitmapDevice);
	return bitmapDevice;
	}


CFbsBitmapDevice* NBitmapMethods::CreateBitmapDeviceL(CFbsBitmap& aBitmap)
	{
	CFbsBitmapDevice* device = CreateBitmapDeviceLC(aBitmap);
	CleanupStack::Pop(device);
	return device;
	}


CFbsBitmap* NBitmapMethods::CreateBitmapLC(TSize aSizeInPixels,TDisplayMode aDispMode)
	{
	CFbsBitmap* bitmap = new(ELeave) CFbsBitmap();
	CleanupStack::PushL(bitmap);
	User::LeaveIfError(bitmap->Create(aSizeInPixels,aDispMode));
	ASSERT((bitmap->DisplayMode() == KColourDepth) || (bitmap->DisplayMode()  == EGray2));
	return bitmap;
	}


CFbsBitmap* NBitmapMethods::CreateBitmapL(TSize aSizeInPixels,TDisplayMode aDispMode)
	{
	CFbsBitmap* bitmap = CreateBitmapLC(aSizeInPixels,aDispMode);
	CleanupStack::Pop(bitmap);
	return bitmap;
	}


CFbsBitmap* NBitmapMethods::CreateBitmapLC(const TDesC& aFileName,TInt aId)
	{
	CFbsBitmap* bitmap = new(ELeave) CFbsBitmap();

	CleanupStack::PushL(bitmap);
	TInt loadException = bitmap->Load(aFileName,aId);
	User::LeaveIfError(loadException);

	if ((bitmap->DisplayMode() == KColourDepth) || (bitmap->DisplayMode()  == EGray2))
		{
		return bitmap;
		}
	else
		{
		CFbsBitmap* newBitmap = CreateBitmapLC(	bitmap->SizeInPixels(),KColourDepth);															

		CFbsBitmapDevice*		bitmapDevice	= CreateBitmapDeviceLC(*newBitmap);
		CFbsBitGc*				bitmapGc		= CreateGraphicsContextLC(*bitmapDevice);
		bitmapGc->BitBlt(TPoint(0,0),bitmap,TRect(bitmap->SizeInPixels()));
		CleanupStack::PopAndDestroy(2); // gc and device
		// The next three lines are here to get rid of the old bitmap but keep the new one 
		CleanupStack::Pop(newBitmap);
		CleanupStack::PopAndDestroy(bitmap);
		CleanupStack::PushL(newBitmap);

		return newBitmap;
		}
	}


CFbsBitmap* NBitmapMethods::CreateBitmapL(const TDesC& aFileName,TInt aId)
	{
	CFbsBitmap* bitmap = CreateBitmapLC(aFileName, aId);
	CleanupStack::Pop(bitmap);
	return bitmap;
	}

void NBitmapMethods::BitBltMaskedEntireBitmap(CFbsBitGc& aTargetGc,TPoint aTopLeft,
											  const CFbsBitmap& aBitmap,const CFbsBitmap& aBitMask)
	{
	PartialReset(aTargetGc);
	aTargetGc.BitBltMasked(aTopLeft,&aBitmap,aBitmap.SizeInPixels(),&aBitMask,ETrue);
	PartialReset(aTargetGc);
	}


void NBitmapMethods::PartialReset(CFbsBitGc& aGc)
	{
	aGc.SetPenSize(TSize(1,1));
	aGc.SetPenColor(KRgbBlack);
	aGc.SetPenStyle(CFbsBitGc::ESolidPen);
	aGc.SetDrawMode(CFbsBitGc::EDrawModePEN);
	aGc.DiscardFont();
	aGc.DiscardBrushPattern();
	aGc.SetBrushColor(KRgbWhite);
	aGc.SetBrushStyle(CFbsBitGc::ENullBrush);
	aGc.SetCharJustification(0,0);
	aGc.SetWordJustification(0,0);
	aGc.SetDitherOrigin(TPoint(0,0));
	aGc.SetPenStyle(CFbsBitGc::ENullPen);
	aGc.SetShadowMode(EFalse);
	aGc.SetStrikethroughStyle(EStrikethroughOff);
	aGc.SetUnderlineStyle(EUnderlineOff);
	aGc.SetUserDisplayMode(ENone);
	}