// Tight
UINT vncEncoder::NumCodedRects(RECT &rect)
{
rfb::Rect TRect;
TRect.br.x = rect.right;
TRect.tl.x = rect.left;
TRect.tl.y = rect.top;
TRect.br.y = rect.bottom;
return NumCodedRects(TRect);
}
UINT vncEncodeCoRRE::RequiredBuffSize(UINT width, UINT height)
{
rfb::Rect fullscreen = rfb::Rect(0, 0, width, height);
UINT codedrects;
// Work out how many rectangles the entire screen would
// be re-encoded to...
codedrects = NumCodedRects(fullscreen);
// The buffer size required is the size of raw data for the whole
// screen plus enough space for the required number of rectangle
// headers.
// This is inherently always greater than the RAW encoded size of
// the whole screen!
return (codedrects * sz_rfbFramebufferUpdateRectHeader) +
(width * height * m_remoteformat.bitsPerPixel)/8;
}
UINT
vncEncodeCoRRE::NumCodedRects(const rfb::Rect &rect)
{
// If we have any statistical data handy then adjust the CoRRE sizes
if (m_statsready)
{
m_statsready = FALSE;
UINT newscore = m_encodedbytes * m_lastrectbytes;
UINT oldscore = m_lastencodedbytes * m_rectbytes;
if (newscore <= oldscore)
{
// The change was a good one, so adjust the threshold accordingly!
m_threshold = max(5, min(95, m_threshold + m_maxadjust));
m_maxwidth = max(8, min(255, m_maxwidth + m_maxadjust));
m_maxheight = max(8, min(255, m_maxheight + m_maxadjust));
}
else
{
// The change was a bad one, so adjust the threshold accordingly!
// m_threshold = Max(5, Min(95, m_threshold - m_maxadjust));
}
// Now calculate a new adjustment and apply it
m_maxadjust = ((rand() % 99)<m_threshold) ? 1 : -1;
// Prepare the stats data for next time...
m_lastencodedbytes = m_encodedbytes;
m_lastrectbytes = m_rectbytes;
m_encodedbytes = 0;
m_rectbytes = 0;
}
// Now return the number of rects that this one would encode to
if ((rect.br.y-rect.tl.y) > m_maxheight)
{
rfb::Rect subrect1, subrect2;
// Find how many rects the two subrects would take
subrect1.tl.x = rect.tl.x;
subrect1.br.x = rect.br.x;
subrect1.tl.y = rect.tl.y;
subrect1.br.y = rect.tl.y + m_maxheight;
subrect2.tl.x = rect.tl.x;
subrect2.br.x = rect.br.x;
subrect2.tl.y = rect.tl.y + m_maxheight;
subrect2.br.y = rect.br.y;
return NumCodedRects(subrect1) + NumCodedRects(subrect2);
}
if ((rect.br.x-rect.tl.x) > m_maxwidth)
{
rfb::Rect subrect1, subrect2;
// Find how many rects the two subrects would take
subrect1.tl.x = rect.tl.x;
subrect1.br.x = rect.tl.x + m_maxwidth;
subrect1.tl.y = rect.tl.y;
subrect1.br.y = rect.br.y;
subrect2.tl.x = rect.tl.x + m_maxwidth;
subrect2.br.x = rect.br.x;
subrect2.tl.y = rect.tl.y;
subrect2.br.y = rect.br.y;
return NumCodedRects(subrect1) + NumCodedRects(subrect2);
}
// This rectangle is small enough not to require splitting
return 1;
}
