ClientConnectionRRE.cpp

// RRE (Rising Rectangle Encoding)
//
// The bits of the ClientConnection object to do with RRE.

#include "stdhdrs.h"
#include "vncviewer.h"
#include "ClientConnection.h"

void ClientConnection::ReadRRERect(rfbFramebufferUpdateRectHeader *pfburh)
{
	// An RRE rect is always followed by a background color
	// For speed's sake we read them together into a buffer.
	char tmpbuf[sz_rfbRREHeader+4];			// biggest pixel is 4 bytes long
    rfbRREHeader *prreh = (rfbRREHeader *) tmpbuf;
	CARD8 *pcolor = (CARD8 *) tmpbuf + sz_rfbRREHeader;
	ReadExact(tmpbuf, sz_rfbRREHeader + m_minPixelBytes);

	prreh->nSubrects = Swap32IfLE(prreh->nSubrects);
	
	SETUP_COLOR_SHORTCUTS;
    COLORREF color;
    switch (m_myFormat.bitsPerPixel) {
        case 8:
            color = COLOR_FROM_PIXEL8_ADDRESS(pcolor); break;
        case 16:
            color = COLOR_FROM_PIXEL16_ADDRESS(pcolor); break;
        case 24:
            color = COLOR_FROM_PIXEL24_ADDRESS(pcolor); break;
        case 32:
            color = COLOR_FROM_PIXEL32_ADDRESS(pcolor); break;
    }

    // Draw the background of the rectangle
    FillSolidRect(pfburh->r.x, pfburh->r.y, pfburh->r.w, pfburh->r.h, color);

    if (prreh->nSubrects == 0) return;

	// Draw the sub-rectangles
    rfbRectangle rect, *pRect;
	// The size of an RRE subrect including color info
	int subRectSize = m_minPixelBytes + sz_rfbRectangle;
    
	// Read subrects into the buffer 
	CheckBufferSize(subRectSize * prreh->nSubrects);
    ReadExact(m_netbuf, subRectSize * prreh->nSubrects);
	BYTE *p = (BYTE *) m_netbuf;

    for (CARD32 i = 0; i < prreh->nSubrects; i++) {
        pRect = (rfbRectangle *) (p + m_minPixelBytes);

		switch (m_myFormat.bitsPerPixel) {
        case 8:
            color = COLOR_FROM_PIXEL8_ADDRESS(p); break;
        case 16:
            color = COLOR_FROM_PIXEL16_ADDRESS(p); break;
        case 24:
            color = COLOR_FROM_PIXEL24_ADDRESS(p); break;
        case 32:
            color = COLOR_FROM_PIXEL32_ADDRESS(p); break;
        };
		
		// color = COLOR_FROM_PIXEL8_ADDRESS(netbuf);
        rect.x = (CARD16) (Swap16IfLE(pRect->x) + pfburh->r.x);
        rect.y = (CARD16) (Swap16IfLE(pRect->y) + pfburh->r.y);
        rect.w = Swap16IfLE(pRect->w);
        rect.h = Swap16IfLE(pRect->h);
        FillSolidRect(rect.x, rect.y, rect.w, rect.h, color);
		p+=subRectSize;
    }
}