// create initial bitmap
void MyBitmap::UpdatePixels(unsigned long *pixels, int width, int height)
{
// if bitmap was never built or bitmap dimension changed
if(m_hBitmap==0 || width!=m_width || height!=m_height)
{
// create a news bitmap
_CreateBitmap(pixels, width, height);
return;
}
// create a DC for the screen and create a memory DC compatible to screen DC
HDC hScrDC = ::GetDC(0); // Get a DC on the main display
HDC hMemDC = ::CreateCompatibleDC(hScrDC);
// select new bitmap into memory DC
HBITMAP hOldBitmap = (HBITMAP)::SelectObject(hMemDC, m_hBitmap);
// set pixels bit
BITMAPINFO Info;
_InitBitmapInfo(Info, width, height,32); // negative height means top-bottom
::SetDIBits(hMemDC,m_hBitmap,0,height,pixels,&Info,DIB_RGB_COLORS);
// select old bitmap back into memory DC and get handle to bitmap of the screen
::SelectObject(hMemDC, hOldBitmap);
// clean up
::ReleaseDC(0,hScrDC);
::DeleteDC(hMemDC);
}
void
Activity::FrameResized(float width, float height)
{
delete fBitmap;
_CreateBitmap();
Invalidate();
}
void
Activity::Draw(BRect rect)
{
BRect viewRect = Bounds();
BRect bitmapRect = fBitmap->Bounds();
if (bitmapRect != viewRect) {
delete fBitmap;
_CreateBitmap();
}
_DrawOnBitmap(IsRunning());
SetDrawingMode(B_OP_COPY);
DrawBitmap(fBitmap);
}
// create initial bitmap
void MyBitmap::CreateBitmap(unsigned long *pixels, int width, int height)
{
_CreateBitmap(pixels, width, height);
}
void
Activity::AllAttached()
{
SetViewColor(B_TRANSPARENT_COLOR);
_CreateBitmap();
}