void CDrawUTwentyFourBppScreenBitmap::UpdateRect(const TRect& aRect) const
{
ASSERT(aRect.iTl.iX >= 0 && aRect.iTl.iY >= 0);
#if defined(_DEBUG)
if (iOrientation&1)
{
ASSERT(aRect.iBr.iX <= iSize.iHeight);
ASSERT(aRect.iBr.iY <= iSize.iWidth);
}
else
{
ASSERT(aRect.iBr.iX <= iSize.iWidth);
ASSERT(aRect.iBr.iY <= iSize.iHeight);
}
#endif
TInt scanLineLen=iLongWidth*4;
TInt srcPixelStep=4;
TPoint srcStart(aRect.iTl);
switch(iOrientation)
{
case CFbsDrawDevice::EOrientationRotated90:
srcPixelStep=scanLineLen;
scanLineLen=-4;
srcStart.iX=iSize.iWidth-1-aRect.iTl.iY;
srcStart.iY=aRect.iTl.iX;
break;
case CFbsDrawDevice::EOrientationRotated180:
srcPixelStep=-4;
scanLineLen=-scanLineLen;
srcStart.iX=iSize.iWidth-1-aRect.iTl.iX;
srcStart.iY=iSize.iHeight-1-aRect.iTl.iY;
break;
case CFbsDrawDevice::EOrientationRotated270:
srcPixelStep=-scanLineLen;
scanLineLen=4;
srcStart.iX=aRect.iTl.iY;
srcStart.iY=iSize.iHeight-1-aRect.iTl.iX;
break;
}
TUint8* srcePtr = (TUint8*)PixelAddress(srcStart.iX,srcStart.iY);
TUint8* srcePtrLimit = srcePtr + aRect.Width()*srcPixelStep;
TInt rowMax = aRect.iTl.iY+aRect.Height();
srcPixelStep-=3; // as we increment while reading it
for(TInt row = aRect.iTl.iY; row < rowMax; row++)
{
TUint8* tempSrcePtr = srcePtr;
TUint8* destPixel = WinPixelAddress(aRect.iTl.iX,row);
while (tempSrcePtr != srcePtrLimit)
{
*destPixel++=*tempSrcePtr++;
*destPixel++=*tempSrcePtr++;
*destPixel++=*tempSrcePtr++;
tempSrcePtr += srcPixelStep;
}
srcePtr+=scanLineLen;
srcePtrLimit+=scanLineLen;
}
}
void CImage::SetSubImage(int xO, int yO, int width, int height)
{
// NOTE: the subimage is with respect to the rectangle specified
// by the origin and current shape
int x = xO - origin[0];
int y = yO - origin[1];
// Adjust the start of memory pointer
m_memStart = (char *) PixelAddress(x, y, 0);
// Compute area of intersection and adjust the shape and origin
int x1 = __min(m_shape.width, x+width); // end column
int y1 = __min(m_shape.height, y+height); // end row
x = __max(0, __min(x, m_shape.width)); // clip to original shape
y = __max(0, __min(y, m_shape.height)); // clip to original shape
m_shape.width = x1 - x; // actual width
m_shape.height = y1 - y; // actual height
origin[0] += x1; // adjust the origin
origin[1] += y1; // adjust the origin
}
void CImage::ClearPixels(void)
{
// Set all the pixels to 0
for (int y = 0; y < m_shape.height; y++)
memset(PixelAddress(0, y, 0), 0, m_pixSize * m_shape.width);
}
