draw.c

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    GC_OP_PROLOGUE(pDrawable, pGC);

    TRC((stderr,"rfbPolyText8 called '%.*s'\n",count,chars));

    if (count) {
	GetTextBoundingBox(pDrawable, pGC->font, x, y, count, &box);

	SAFE_REGION_INIT(pDrawable->pScreen, &tmpRegion, &box, 0);

	REGION_INTERSECT(pDrawable->pScreen, &tmpRegion, &tmpRegion,
			 WINDOW_CLIP_REGION(((WindowPtr)pDrawable),pGC));

	ADD_TO_MODIFIED_REGION(pDrawable->pScreen, &tmpRegion);

	REGION_UNINIT(pDrawable->pScreen, &tmpRegion);
    }

    ret = (*pGC->ops->PolyText8) (pDrawable, pGC, x, y, count, chars);

    if (count) {
	SCHEDULE_FB_UPDATE(pDrawable->pScreen, prfb);
    }

    GC_OP_EPILOGUE(pGC);
    return ret;
}

/*
 * PolyText16 - use rough bounding box.
 */

static int
rfbPolyText16(pDrawable, pGC, x, y, count, chars)
    DrawablePtr pDrawable;
    GCPtr	pGC;
    int		x, y;
    int		count;
    unsigned short *chars;
{
    int	ret;
    RegionRec tmpRegion;
    BoxRec box;
    GC_OP_PROLOGUE(pDrawable, pGC);

    TRC((stderr,"rfbPolyText16 called\n"));

    if (count) {
	GetTextBoundingBox(pDrawable, pGC->font, x, y, count, &box);

	SAFE_REGION_INIT(pDrawable->pScreen, &tmpRegion, &box, 0);

	REGION_INTERSECT(pDrawable->pScreen, &tmpRegion, &tmpRegion,
			 WINDOW_CLIP_REGION(((WindowPtr)pDrawable),pGC));

	ADD_TO_MODIFIED_REGION(pDrawable->pScreen, &tmpRegion);

	REGION_UNINIT(pDrawable->pScreen, &tmpRegion);
    }

    ret = (*pGC->ops->PolyText16) (pDrawable, pGC, x, y, count, chars);

    if (count) {
	SCHEDULE_FB_UPDATE(pDrawable->pScreen, prfb);
    }

    GC_OP_EPILOGUE(pGC);
    return ret;
}

/*
 * ImageText8 - use rough bounding box.
 */

static void
rfbImageText8(pDrawable, pGC, x, y, count, chars)
    DrawablePtr pDrawable;
    GCPtr	pGC;
    int		x, y;
    int		count;
    char	*chars;
{
    RegionRec tmpRegion;
    BoxRec box;
    GC_OP_PROLOGUE(pDrawable, pGC);

    TRC((stderr,"rfbImageText8 called '%.*s'\n",count,chars));

    if (count) {
	GetTextBoundingBox(pDrawable, pGC->font, x, y, count, &box);

	SAFE_REGION_INIT(pDrawable->pScreen, &tmpRegion, &box, 0);

	REGION_INTERSECT(pDrawable->pScreen, &tmpRegion, &tmpRegion,
			 WINDOW_CLIP_REGION(((WindowPtr)pDrawable),pGC));

	ADD_TO_MODIFIED_REGION(pDrawable->pScreen, &tmpRegion);

	REGION_UNINIT(pDrawable->pScreen, &tmpRegion);
    }

    (*pGC->ops->ImageText8) (pDrawable, pGC, x, y, count, chars);

    if (count) {
	SCHEDULE_FB_UPDATE(pDrawable->pScreen, prfb);
    }

    GC_OP_EPILOGUE(pGC);
}

/*
 * ImageText16 - use rough bounding box.
 */

static void
rfbImageText16(pDrawable, pGC, x, y, count, chars)
    DrawablePtr pDrawable;
    GCPtr	pGC;
    int		x, y;
    int		count;
    unsigned short *chars;
{
    RegionRec tmpRegion;
    BoxRec box;
    GC_OP_PROLOGUE(pDrawable, pGC);

    TRC((stderr,"rfbImageText16 called\n"));

    if (count) {
	GetTextBoundingBox(pDrawable, pGC->font, x, y, count, &box);

	SAFE_REGION_INIT(pDrawable->pScreen, &tmpRegion, &box, 0);

	REGION_INTERSECT(pDrawable->pScreen, &tmpRegion, &tmpRegion,
			 WINDOW_CLIP_REGION(((WindowPtr)pDrawable),pGC));

	ADD_TO_MODIFIED_REGION(pDrawable->pScreen, &tmpRegion);

	REGION_UNINIT(pDrawable->pScreen, &tmpRegion);
    }

    (*pGC->ops->ImageText16) (pDrawable, pGC, x, y, count, chars);

    if (count) {
	SCHEDULE_FB_UPDATE(pDrawable->pScreen, prfb);
    }

    GC_OP_EPILOGUE(pGC);
}

/*
 * ImageGlyphBlt - use rough bounding box.
 */

static void
rfbImageGlyphBlt(pDrawable, pGC, x, y, nglyph, ppci, pglyphBase)
    DrawablePtr pDrawable;
    GCPtr 	pGC;
    int 	x, y;
    unsigned int nglyph;
    CharInfoPtr *ppci;		/* array of character info */
    pointer 	pglyphBase;	/* start of array of glyphs */
{
    RegionRec tmpRegion;
    BoxRec box;
    GC_OP_PROLOGUE(pDrawable, pGC);

    TRC((stderr,"rfbImageGlyphBlt called\n"));

    if (nglyph) {
	GetTextBoundingBox(pDrawable, pGC->font, x, y, nglyph, &box);

	SAFE_REGION_INIT(pDrawable->pScreen, &tmpRegion, &box, 0);

	REGION_INTERSECT(pDrawable->pScreen, &tmpRegion, &tmpRegion,
			 WINDOW_CLIP_REGION(((WindowPtr)pDrawable),pGC));

	ADD_TO_MODIFIED_REGION(pDrawable->pScreen, &tmpRegion);

	REGION_UNINIT(pDrawable->pScreen, &tmpRegion);
    }

    (*pGC->ops->ImageGlyphBlt) (pDrawable, pGC, x, y, nglyph, ppci,pglyphBase);

    if (nglyph) {
	SCHEDULE_FB_UPDATE(pDrawable->pScreen, prfb);
    }

    GC_OP_EPILOGUE(pGC);
}

/*
 * PolyGlyphBlt - use rough bounding box.
 */

static void
rfbPolyGlyphBlt(pDrawable, pGC, x, y, nglyph, ppci, pglyphBase)
    DrawablePtr pDrawable;
    GCPtr	pGC;
    int 	x, y;
    unsigned int nglyph;
    CharInfoPtr *ppci;		/* array of character info */
    pointer	pglyphBase;	/* start of array of glyphs */
{
    RegionRec tmpRegion;
    BoxRec box;
    GC_OP_PROLOGUE(pDrawable, pGC);

    TRC((stderr,"rfbPolyGlyphBlt called\n"));

    if (nglyph) {
	GetTextBoundingBox(pDrawable, pGC->font, x, y, nglyph, &box);

	SAFE_REGION_INIT(pDrawable->pScreen, &tmpRegion, &box, 0);

	REGION_INTERSECT(pDrawable->pScreen, &tmpRegion, &tmpRegion,
			 WINDOW_CLIP_REGION(((WindowPtr)pDrawable),pGC));

	ADD_TO_MODIFIED_REGION(pDrawable->pScreen, &tmpRegion);

	REGION_UNINIT(pDrawable->pScreen, &tmpRegion);
    }

    (*pGC->ops->PolyGlyphBlt) (pDrawable, pGC, x, y, nglyph, ppci, pglyphBase);

    if (nglyph) {
	SCHEDULE_FB_UPDATE(pDrawable->pScreen, prfb);
    }

    GC_OP_EPILOGUE(pGC);
}

/*
 * PushPixels - be fairly safe - region modified is intersection of the given
 * rectangle with the window clip region.
 */

static void
rfbPushPixels(pGC, pBitMap, pDrawable, w, h, x, y)
    GCPtr	pGC;
    PixmapPtr	pBitMap;
    DrawablePtr pDrawable;
    int		w, h, x, y;
{
    RegionRec tmpRegion;
    BoxRec box;
    GC_OP_PROLOGUE(pDrawable, pGC);

    TRC((stderr,"rfbPushPixels called\n"));

    box.x1 = x + pDrawable->x;
    box.y1 = y + pDrawable->y;
    box.x2 = box.x1 + w;
    box.y2 = box.y1 + h;

    SAFE_REGION_INIT(pDrawable->pScreen, &tmpRegion, &box, 0);

    REGION_INTERSECT(pDrawable->pScreen, &tmpRegion, &tmpRegion,
		     WINDOW_CLIP_REGION(((WindowPtr)pDrawable),pGC));

    ADD_TO_MODIFIED_REGION(pDrawable->pScreen, &tmpRegion);

    REGION_UNINIT(pDrawable->pScreen, &tmpRegion);

    (*pGC->ops->PushPixels) (pGC, pBitMap, pDrawable, w, h, x, y);

    SCHEDULE_FB_UPDATE(pDrawable->pScreen, prfb);

    GC_OP_EPILOGUE(pGC);
}



/****************************************************************************/
/*
 * Other functions
 */
/****************************************************************************/

/*
 * rfbCopyRegion.  Args are src and dst regions plus a translation (dx,dy).
 * Takes these args together with the existing modified region and possibly an
 * existing copy region and translation.  Produces a combined modified region
 * plus copy region and translation.  Note that the copy region is the
 * destination of the copy.
 *
 * First we trim parts of src which are invalid (ie in the modified region).
 * Then we see if there is any overlap between the src and the existing copy
 * region.  If not then the two copies cannot be combined, so we choose
 * whichever is bigger to form the basis of a new copy, while the other copy is
 * just done the hard way by being added to the modified region.  So if the
 * existing copy is bigger then we simply add the destination of the new copy
 * to the modified region and we're done.  If the new copy is bigger, we add
 * the old copy region to the modified region and behave as though there is no
 * existing copy region.
 * 
 * At this stage we now know that either the two copies can be combined, or
 * that there is no existing copy.  We temporarily add both the existing copy
 * region and dst to the modified region (this is the entire area of the screen
 * affected in any way).  Finally we calculate the new copy region, and remove
 * it from the modified region.
 *
 * Note:
 *   1. The src region is modified by this routine.
 *   2. When the copy region is empty, copyDX and copyDY MUST be set to zero.
 */

static void
rfbCopyRegion(pScreen, cl, src, dst, dx, dy)
    ScreenPtr pScreen;
    rfbClientPtr cl;
    RegionPtr src;
    RegionPtr dst;
    int dx, dy;
{
    RegionRec tmp;

    /* src = src - modifiedRegion */

    REGION_SUBTRACT(pScreen, src, src, &cl->modifiedRegion);

    if (REGION_NOTEMPTY(pScreen, &cl->copyRegion)) {

	REGION_INIT(pScreen, &tmp, NullBox, 0);
	REGION_INTERSECT(pScreen, &tmp, src, &cl->copyRegion);

	if (REGION_NOTEMPTY(pScreen, &tmp)) {

	    /* if src and copyRegion overlap:
	         src = src intersect copyRegion */

	    REGION_COPY(pScreen, src, &tmp);

	} else {

	    /* if no overlap, find bigger region */

	    int newArea = (((REGION_EXTENTS(pScreen,src))->x2
			    - (REGION_EXTENTS(pScreen,src))->x1)
			   * ((REGION_EXTENTS(pScreen,src))->y2
			      - (REGION_EXTENTS(pScreen,src))->y1));

	    int oldArea = (((REGION_EXTENTS(pScreen,&cl->copyRegion))->x2
			    - (REGION_EXTENTS(pScreen,&cl->copyRegion))->x1)
			   * ((REGION_EXTENTS(pScreen,&cl->copyRegion))->y2
			     - (REGION_EXTENTS(pScreen,&cl->copyRegion))->y1));

	    if (oldArea > newArea) {

		/* existing copy is bigger:
		     modifiedRegion = modifiedRegion union dst
		     copyRegion = copyRegion - dst
		     return */

		REGION_UNION(pScreen, &cl->modifiedRegion, &cl->modifiedRegion,
			     dst);
		REGION_SUBTRACT(pScreen, &cl->copyRegion, &cl->copyRegion,
				dst);
		if (!REGION_NOTEMPTY(pScreen, &cl->copyRegion)) {
		    cl->copyDX = 0;
		    cl->copyDY = 0;
		}
		return;
	    }

	    /* new copy is bigger:
	         modifiedRegion = modifiedRegion union copyRegion
		 copyRegion = empty */

	    REGION_UNION(pScreen, &cl->modifiedRegion, &cl->modifiedRegion,
			 &cl->copyRegion);
	    REGION_EMPTY(pScreen, &cl->copyRegion);
	    cl->copyDX = cl->copyDY = 0;
	}
    }


    /* modifiedRegion = modifiedRegion union dst union copyRegion */

    REGION_UNION(pScreen, &cl->modifiedRegion, &cl->modifiedRegion, dst);
    REGION_UNION(pScreen, &cl->modifiedRegion, &cl->modifiedRegion,
		 &cl->copyRegion);

    /* copyRegion = T(src) intersect dst */

    REGION_TRANSLATE(pScreen, src, dx, dy);
    REGION_INTERSECT(pScreen, &cl->copyRegion, src, dst);

    /* modifiedRegion = modifiedRegion - copyRegion */

    REGION_SUBTRACT(pScreen, &cl->modifiedRegion, &cl->modifiedRegion,
		    &cl->copyRegion);

    /* combine new translation T with existing translation */

    if (REGION_NOTEMPTY(pScreen, &cl->copyRegion)) {
	cl->copyDX += dx;
	cl->copyDY += dy;
    } else {
	cl->copyDX = 0;
	cl->copyDY = 0;
    }
}


/*
 * rfbDeferredUpdateCallback() is called when a client's deferredUpdateTimer
 * goes off.
 */

static CARD32
rfbDeferredUpdateCallback(OsTimerPtr timer, CARD32 now, pointer arg)
{
  rfbClientPtr cl = (rfbClientPtr)arg;

  rfbSendFramebufferUpdate(cl);

  cl->deferredUpdateScheduled = FALSE;
  return 0;
}


/*
 * rfbScheduleDeferredUpdate() is called from the SCHEDULE_FB_UPDATE macro
 * to schedule an update.
 */

static void
rfbScheduleDeferredUpdate(rfbClientPtr cl)
{
    if (rfbDeferUpdateTime != 0) {
	cl->deferredUpdateTimer = TimerSet(cl->deferredUpdateTimer, 0,
					   rfbDeferUpdateTime,
					   rfbDeferredUpdateCallback, cl);
	cl->deferredUpdateScheduled = TRUE;
    } else {
	rfbSendFramebufferUpdate(cl);
    }
}


/*
 * PrintRegion is useful for debugging.
 */

static void
PrintRegion(pScreen,reg)
    ScreenPtr pScreen;
    RegionPtr reg;
{
    int nrects = REGION_NUM_RECTS(reg);
    int i;

    rfbLog("Region num rects %d extents %d,%d %d,%d\n",nrects,
	   (REGION_EXTENTS(pScreen,reg))->x1,
	   (REGION_EXTENTS(pScreen,reg))->y1,
	   (REGION_EXTENTS(pScreen,reg))->x2,
	   (REGION_EXTENTS(pScreen,reg))->y2);

    for (i = 0; i < nrects; i++) {
	rfbLog("    rect %d,%d %dx%d\n",
	       REGION_RECTS(reg)[i].x1,
	       REGION_RECTS(reg)[i].y1,
	       REGION_RECTS(reg)[i].x2-REGION_RECTS(reg)[i].x1,
	       REGION_RECTS(reg)[i].y2-REGION_RECTS(reg)[i].y1);
    }
}