1 files changed, 646 insertions, 0 deletions

diff --git a/Xext/mbufpx.c b/Xext/mbufpx.c
new file mode 100644
index 000000000..9474cc9aa
--- /dev/null
+++ b/Xext/mbufpx.c
@@ -0,0 +1,646 @@
+/************************************************************
+
+Copyright 1989, 1998  The Open Group
+
+Permission to use, copy, modify, distribute, and sell this software and its
+documentation for any purpose is hereby granted without fee, provided that
+the above copyright notice appear in all copies and that both that
+copyright notice and this permission notice appear in supporting
+documentation.
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
+OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+Except as contained in this notice, the name of The Open Group shall not be
+used in advertising or otherwise to promote the sale, use or other dealings
+in this Software without prior written authorization from The Open Group.
+
+********************************************************/
+
+/* $Xorg: mbufpx.c,v 1.4 2001/02/09 02:04:32 xorgcvs Exp $ */
+#define NEED_REPLIES
+#define NEED_EVENTS
+#include <stdio.h>
+#include "X.h"
+#include "Xproto.h"
+#include "misc.h"
+#include "os.h"
+#include "windowstr.h"
+#include "scrnintstr.h"
+#include "pixmapstr.h"
+#include "extnsionst.h"
+#include "dixstruct.h"
+#include "resource.h"
+#include "opaque.h"
+#include "regionstr.h"
+#include "gcstruct.h"
+#include "inputstr.h"
+#include <sys/time.h>
+
+#define _MULTIBUF_SERVER_	/* don't want Xlib structures */
+#define _MULTIBUF_PIXMAP_
+#include "multibufst.h"
+
+
+static Bool NoopDDA_True() { return TRUE; }
+
+static Bool pixPositionWindow();
+static int  pixCreateImageBuffers();
+static void pixDisplayImageBuffers();
+static void pixClearImageBufferArea();
+static void pixDeleteBufferDrawable();
+static void pixWrapScreenFuncs();
+static void pixResetProc();
+
+Bool
+pixMultibufferInit(pScreen, pMBScreen)
+    ScreenPtr pScreen;
+    mbufScreenPtr pMBScreen;
+{
+    int			i, j, k;
+    xMbufBufferInfo	*pInfo;
+    int			nInfo;
+    DepthPtr		pDepth;
+    mbufPixmapPrivPtr	pMBPriv;
+
+    pMBScreen->CreateImageBuffers = pixCreateImageBuffers;
+    pMBScreen->DestroyImageBuffers = (void (*)())NoopDDA;
+    pMBScreen->DisplayImageBuffers = pixDisplayImageBuffers;
+    pMBScreen->ClearImageBufferArea = pixClearImageBufferArea;
+    pMBScreen->ChangeMBufferAttributes = NoopDDA_True;
+    pMBScreen->ChangeBufferAttributes = NoopDDA_True;
+    pMBScreen->DeleteBufferDrawable = pixDeleteBufferDrawable;
+    pMBScreen->WrapScreenFuncs = pixWrapScreenFuncs;
+    pMBScreen->ResetProc = pixResetProc;
+
+    /* Support every depth and visual combination that the screen does */
+
+    nInfo = 0;
+    for (i = 0; i < pScreen->numDepths; i++)
+    {
+	pDepth = &pScreen->allowedDepths[i];
+	nInfo += pDepth->numVids;
+    }
+
+    pInfo = (xMbufBufferInfo *) xalloc (nInfo * sizeof (xMbufBufferInfo));
+    if (!pInfo)
+	return FALSE;
+
+    k = 0;
+    for (i = 0; i < pScreen->numDepths; i++)
+    {
+	pDepth = &pScreen->allowedDepths[i];
+	for (j = 0; j < pDepth->numVids; j++)
+	{
+	    pInfo[k].visualID = pDepth->vids[j];
+	    pInfo[k].maxBuffers = 0;
+	    pInfo[k].depth = pDepth->depth;
+	    k++;
+	}
+    }
+
+    pMBScreen->nInfo = nInfo;
+    pMBScreen->pInfo = pInfo;
+
+    /*
+     * Setup the devPrivate to mbufScreenRec
+     */
+
+    pMBPriv = (mbufPixmapPrivPtr) xalloc(sizeof(* pMBPriv));
+    if (!pMBPriv)
+    {
+	xfree(pInfo);
+	return (FALSE);
+    }
+    pMBScreen->devPrivate.ptr = (pointer) pMBPriv;
+    pMBPriv->PositionWindow = NULL;
+    pMBPriv->funcsWrapped = 0;
+
+    return TRUE;
+}
+
+/*ARGSUSED*/
+static int
+pixCreateImageBuffers (pWin, nbuf, ids, action, hint)
+    WindowPtr	pWin;
+    int		nbuf;
+    XID		*ids;
+    int		action;
+    int		hint;
+{
+    mbufWindowPtr	pMBWindow;
+    mbufBufferPtr	pMBBuffer;
+    ScreenPtr		pScreen;
+    int			width, height, depth;
+    int			i;
+
+    pMBWindow = MB_WINDOW_PRIV(pWin);
+
+    width = pWin->drawable.width;
+    height = pWin->drawable.height;
+    depth = pWin->drawable.depth;
+    pScreen = pWin->drawable.pScreen;
+
+    for (i = 0; i < nbuf; i++)
+    {
+	pMBBuffer = &pMBWindow->buffers[i];
+	pMBBuffer->pDrawable = (DrawablePtr)
+	    (*pScreen->CreatePixmap) (pScreen, width, height, depth);
+	if (!pMBBuffer->pDrawable)
+	    break;
+
+	if (!AddResource (ids[i], MultibufferDrawableResType,
+			  (pointer) pMBBuffer->pDrawable))
+	{
+	    (*pScreen->DestroyPixmap) ((PixmapPtr) pMBBuffer->pDrawable);
+	    break;
+	}
+	pMBBuffer->pDrawable->id = ids[i];
+
+	/*
+	 * In the description of the CreateImageBuffers request:
+         * "If the window is mapped, or if these image buffers have
+         *  backing store, their contents will be tiled with the window
+         *  background, and zero or more expose events will be generated
+         *  for each of these buffers."
+	 */
+
+	(* MB_SCREEN_PRIV(pScreen)->ClearImageBufferArea)
+	    (pMBBuffer, 0,0, 0,0, TRUE);
+    }
+
+    return i;
+}
+
+/*
+ * set up the gc to clear the pixmaps;
+ */
+static Bool
+SetupBackgroundPainter (pWin, pGC)
+    WindowPtr	pWin;
+    GCPtr	pGC;
+{
+    XID		    gcvalues[4];
+    int		    ts_x_origin, ts_y_origin;
+    PixUnion	    background;
+    int		    backgroundState;
+    Mask	    gcmask;
+
+    /*
+     * First take care of any ParentRelative stuff by altering the
+     * tile/stipple origin to match the coordinates of the upper-left
+     * corner of the first ancestor without a ParentRelative background.
+     * This coordinate is, of course, negative.
+     */
+
+    ts_x_origin = ts_y_origin = 0;
+    while (pWin->backgroundState == ParentRelative) {
+	ts_x_origin -= pWin->origin.x;
+	ts_y_origin -= pWin->origin.y;
+	pWin = pWin->parent;
+    }
+    backgroundState = pWin->backgroundState;
+    background = pWin->background;
+
+    switch (backgroundState)
+    {
+    case BackgroundPixel:
+	gcvalues[0] = (XID) background.pixel;
+	gcvalues[1] = FillSolid;
+	gcmask = GCForeground|GCFillStyle;
+	break;
+
+    case BackgroundPixmap:
+	gcvalues[0] = FillTiled;
+	gcvalues[1] = (XID) background.pixmap;
+	gcvalues[2] = ts_x_origin;
+	gcvalues[3] = ts_y_origin;
+	gcmask = GCFillStyle|GCTile|GCTileStipXOrigin|GCTileStipYOrigin;
+	break;
+
+    default:
+	return FALSE;
+    }
+    DoChangeGC(pGC, gcmask, gcvalues, TRUE);
+    return TRUE;
+}
+
+static void
+MultibufferPaintBackgroundRectangles(pWin, pDrawable, nrects, pRects)
+    WindowPtr pWin;
+    DrawablePtr pDrawable;
+    int nrects;
+    xRectangle *pRects;
+{
+    GCPtr      pGC;
+
+    pGC = GetScratchGC (pWin->drawable.depth, pWin->drawable.pScreen);
+    if (SetupBackgroundPainter(pWin, pGC))
+    {
+	ValidateGC(pDrawable, pGC);
+	(*pGC->ops->PolyFillRect) (pDrawable, pGC, nrects, pRects);
+    }
+    FreeScratchGC(pGC);
+}
+
+static void
+MultibufferPaintBackgroundRegion(pWin, pDrawable, pRegion)
+    WindowPtr pWin;
+    DrawablePtr pDrawable;
+    RegionPtr pRegion;
+{
+    xRectangle *pRects;
+    int nrects  = REGION_NUM_RECTS(pRegion);
+    BoxPtr pbox = REGION_RECTS(pRegion);
+
+    pRects = (xRectangle *)ALLOCATE_LOCAL(nrects * sizeof(xRectangle));
+    if (pRects)
+    {
+	int i;
+	for (i = 0; i < nrects; i++)
+	{
+	    pRects[i].x = pbox->x1;
+	    pRects[i].y = pbox->y1;
+	    pRects[i].width  = pbox->x2 - pbox->x1;
+	    pRects[i].height = pbox->y2 - pbox->y1;
+	}
+	MultibufferPaintBackgroundRectangles(pWin, pDrawable, nrects, pRects);
+	DEALLOCATE_LOCAL(pRects);
+    }
+}
+
+static void
+pixDisplayImageBuffers(pScreen, ppMBWindow, ppMBBuffer, nbuf)
+    mbufBufferPtr	    *ppMBBuffer;
+    mbufWindowPtr	    *ppMBWindow;
+    int		    nbuf;
+{
+    GCPtr	    pGC = NULL;
+    PixmapPtr	    pPrevPixmap, pNewPixmap;
+    WindowPtr	    pWin;
+    RegionPtr	    pExposed;
+    int		    i;
+    mbufBufferPtr  pPrevMBBuffer;
+    XID		    bool;
+    xRectangle      r;
+
+    UpdateCurrentTime ();
+    for (i = 0; i < nbuf; i++)
+    {
+	pWin = ppMBWindow[i]->pWindow;
+
+	/* Time to get a different scratch GC? */
+
+	if (!pGC
+	    || pGC->depth   != pWin->drawable.depth
+	    || pGC->pScreen != pWin->drawable.pScreen)
+	{
+	    if (pGC) FreeScratchGC(pGC);
+	    pGC = GetScratchGC (pWin->drawable.depth, pWin->drawable.pScreen);
+	}
+	pPrevMBBuffer = MB_DISPLAYED_BUFFER(ppMBWindow[i]);
+	pPrevPixmap = (PixmapPtr) pPrevMBBuffer->pDrawable;
+	pNewPixmap = (PixmapPtr) ppMBBuffer[i]->pDrawable;
+
+	if (pPrevPixmap == pNewPixmap)
+	{
+	  /* "If a specified buffer is already displayed, any delays and
+	   *  update action will still be performed for that buffer."
+	   *
+	   *  We special-case this because applications do occasionally
+	   *  request a redundant DisplayImageBuffers, and we can save
+	   *  strokes by recognizing that the only update action that will
+	   *  change the buffer contents in this case is Background.
+	   */
+	    if (ppMBWindow[i]->updateAction == MultibufferUpdateActionBackground)
+	    {
+		r.x = r.y = 0;
+		r.width  = pWin->drawable.width;
+		r.height = pWin->drawable.height;
+		MultibufferPaintBackgroundRectangles(pWin, (DrawablePtr)pWin,
+						     1, &r);
+	    }
+	}
+	else /* different buffer is being displayed */
+	{
+	    /* perform update action */
+
+	    switch (ppMBWindow[i]->updateAction)
+	    {
+	    case MultibufferUpdateActionUndefined:
+		break;
+
+	    case MultibufferUpdateActionBackground:
+
+		r.x = r.y = 0;
+		r.width  = pPrevPixmap->drawable.width;
+		r.height = pPrevPixmap->drawable.height;
+		MultibufferPaintBackgroundRectangles(pWin,
+						     (DrawablePtr)pPrevPixmap,
+						     1, &r);
+		break;
+
+	    case MultibufferUpdateActionUntouched:
+		
+		/* copy the window to the pixmap that represents the
+		 * currently displayed buffer
+		 */
+
+		if (pPrevMBBuffer->eventMask & ExposureMask)
+		{
+		    bool = TRUE;
+		    DoChangeGC (pGC, GCGraphicsExposures, &bool, FALSE);
+		}
+		ValidateGC ((DrawablePtr)pPrevPixmap, pGC);
+		pExposed = (*pGC->ops->CopyArea)((DrawablePtr) pWin,
+						 (DrawablePtr) pPrevPixmap,
+						 pGC,
+						 0, 0,
+						 pWin->drawable.width,
+						 pWin->drawable.height,
+						 0, 0);
+
+		/* if we couldn't copy the whole window to the buffer,
+		 * send expose events (if any client wants them)
+		 */
+
+		if (pPrevMBBuffer->eventMask & ExposureMask)
+		{ /* some client wants expose events */
+		    if (pExposed)
+		    {
+			RegionPtr	 pWinSize;
+			extern RegionPtr CreateUnclippedWinSize();
+			ScreenPtr pScreen = pWin->drawable.pScreen;
+			pWinSize = CreateUnclippedWinSize (pWin);
+			/*
+			 * pExposed is window-relative, but at this point
+			 * pWinSize is screen-relative.  Make pWinSize be
+			 * window-relative so that region ops involving
+			 * pExposed and pWinSize behave sensibly.
+			 */
+			REGION_TRANSLATE(pScreen, pWinSize,
+						     -pWin->drawable.x,
+						     -pWin->drawable.y);
+			REGION_INTERSECT(pScreen, pExposed, pExposed, pWinSize);
+			REGION_DESTROY(pScreen, pWinSize);
+			MultibufferExpose (pPrevMBBuffer, pExposed);
+			REGION_DESTROY(pScreen, pExposed);
+		    }
+		    bool = FALSE;
+		    DoChangeGC (pGC, GCGraphicsExposures, &bool, FALSE);
+		} /* end some client wants expose events */
+
+		break; /* end case MultibufferUpdateActionUntouched */
+
+	    case MultibufferUpdateActionCopied:
+
+		ValidateGC ((DrawablePtr)pPrevPixmap, pGC);
+		(*pGC->ops->CopyArea) ((DrawablePtr)pNewPixmap,
+				       (DrawablePtr)pPrevPixmap, pGC,
+				       0, 0, pWin->drawable.width,
+				       pWin->drawable.height, 0, 0);
+		break;
+
+	    } /* end switch on update action */
+
+	    /* display the new buffer */
+
+	    ValidateGC ((DrawablePtr)pWin, pGC);
+	    (*pGC->ops->CopyArea) ((DrawablePtr)pNewPixmap, (DrawablePtr)pWin,
+				   pGC, 0, 0,
+				   pWin->drawable.width, pWin->drawable.height,
+				   0, 0);
+	}
+
+	ppMBWindow[i]->lastUpdate = currentTime;
+    }
+
+    if (pGC) FreeScratchGC (pGC);
+    return;
+}
+
+/*
+ * resize the buffers when the window is resized
+ */ 
+
+static Bool
+pixPositionWindow (pWin, x, y)
+    WindowPtr	pWin;
+    int		x, y;
+{
+    ScreenPtr	    pScreen;
+    mbufPixmapPrivPtr pMBPriv;
+    mbufWindowPtr   pMBWindow;
+    mbufBufferPtr   pMBBuffer;
+    int		    width, height;
+    int		    i;
+    int		    dx, dy, dw, dh;
+    int		    sourcex, sourcey;
+    int		    destx, desty;
+    PixmapPtr	    pPixmap;
+    GCPtr	    pGC;
+    int		    savewidth, saveheight;
+    Bool	    clear;
+    RegionRec       exposedRegion;
+    Bool	    ret;
+
+    pScreen = pWin->drawable.pScreen;
+    pMBPriv = MB_SCREEN_PRIV_PIXMAP(pScreen);
+
+    UNWRAP_SCREEN_FUNC(pScreen, pMBPriv, Bool, PositionWindow);
+    ret = (* pScreen->PositionWindow) (pWin, x, y);
+    REWRAP_SCREEN_FUNC(pScreen, pMBPriv, Bool, PositionWindow);
+
+    if (!(pMBWindow = MB_WINDOW_PRIV(pWin)))
+	return ret;
+
+    /* if new size is same as old, we're done */
+
+    if (pMBWindow->width == pWin->drawable.width &&
+        pMBWindow->height == pWin->drawable.height)
+	return ret;
+
+    width = pWin->drawable.width;
+    height = pWin->drawable.height;
+    dx = pWin->drawable.x - pMBWindow->x;
+    dy = pWin->drawable.x - pMBWindow->y;
+    dw = width - pMBWindow->width;
+    dh = height - pMBWindow->height;
+    GravityTranslate (0, 0, -dx, -dy, dw, dh,
+		      pWin->bitGravity, &destx, &desty);
+
+    /* if the window grew, remember to paint the window background,
+     * and maybe send expose events, for the new areas of the buffers
+     */
+
+    clear = pMBWindow->width < width || pMBWindow->height < height ||
+	    pWin->bitGravity == ForgetGravity;
+
+    sourcex = 0;
+    sourcey = 0;
+    savewidth = pMBWindow->width;
+    saveheight = pMBWindow->height;
+    /* clip rectangle to source and destination */
+    if (destx < 0)
+    {
+	savewidth += destx;
+	sourcex -= destx;
+	destx = 0;
+    }
+    if (destx + savewidth > width)
+	savewidth = width - destx;
+    if (desty < 0)
+    {
+	saveheight += desty;
+	sourcey -= desty;
+	desty = 0;
+    }
+    if (desty + saveheight > height)
+	saveheight = height - desty;
+
+    pMBWindow->width = width;
+    pMBWindow->height = height;
+    pMBWindow->x = pWin->drawable.x;
+    pMBWindow->y = pWin->drawable.y;
+
+    if (clear)
+    {
+	BoxRec box;
+
+	box.x1 = box.y1 = 0;
+	box.x2 = width;
+	box.y2 = height;
+	REGION_INIT(pScreen, &exposedRegion, &box, 1);
+	if (pWin->bitGravity != ForgetGravity)
+	{
+	    RegionRec preservedRegion;
+	    box.x1 = destx;
+	    box.y1 = desty;
+	    box.x2 = destx + savewidth;
+	    box.y2 = desty + saveheight;
+	    REGION_INIT(pScreen, &preservedRegion, &box, 1);
+	    REGION_SUBTRACT(pScreen, &exposedRegion, &exposedRegion, &preservedRegion);
+	    REGION_UNINIT(pScreen, &preservedRegion);
+	}
+
+    } /* end if (clear) */
+
+    pGC = GetScratchGC (pWin->drawable.depth, pScreen);
+
+    /* create buffers with new window size */
+
+    for (i = 0; i < pMBWindow->numMultibuffer; i++)
+    {
+	pMBBuffer = &pMBWindow->buffers[i];
+	pPixmap = (*pScreen->CreatePixmap) (pScreen, width, height, pWin->drawable.depth);
+	if (!pPixmap)
+	{
+	    (* MB_SCREEN_PRIV(pScreen)->DestroyImageBuffers)(pWin);
+	    break;
+	}
+	if (clear)
+	{
+	    MultibufferPaintBackgroundRegion(pWin, (DrawablePtr)pPixmap, &exposedRegion);
+	    MultibufferExpose(pMBBuffer, &exposedRegion);
+	}
+	if (pWin->bitGravity != ForgetGravity)
+	{
+	    ValidateGC ((DrawablePtr)pPixmap, pGC);
+	    (*pGC->ops->CopyArea) (pMBBuffer->pDrawable, (DrawablePtr)pPixmap,
+				   pGC,
+				   sourcex, sourcey, savewidth, saveheight,
+				   destx, desty);
+	}
+	pPixmap->drawable.id = pMBBuffer->pDrawable->id;
+	(*pScreen->DestroyPixmap) ((PixmapPtr) pMBBuffer->pDrawable);
+	pMBBuffer->pDrawable = (DrawablePtr) pPixmap;
+	if (i != pMBWindow->displayedMultibuffer)
+	{
+	    ChangeResourceValue (pPixmap->drawable.id,
+				 MultibufferDrawableResType,
+				 (pointer) pPixmap);
+	}
+    }
+    FreeScratchGC (pGC);
+    if (clear)
+	REGION_UNINIT(pScreen, &exposedRegion);
+    return TRUE;
+}
+
+static void
+pixWrapScreenFuncs(pScreen)
+    ScreenPtr pScreen;
+{
+    mbufPixmapPrivPtr pMBPriv = MB_SCREEN_PRIV_PIXMAP(pScreen);
+    WRAP_SCREEN_FUNC(pScreen, pMBPriv, PositionWindow, pixPositionWindow);
+}
+
+static void
+pixResetProc(pScreen)
+    ScreenPtr pScreen;
+{
+    mbufScreenPtr pMBScreen = MB_SCREEN_PRIV(pScreen);
+    mbufPixmapPrivPtr pMBPriv = MB_SCREEN_PRIV_PIXMAP(pScreen);
+
+    xfree(pMBScreen->pInfo);
+    xfree(pMBPriv);
+}
+
+static void
+pixClearImageBufferArea(pMBBuffer, x,y, width,height, exposures)
+    mbufBufferPtr	pMBBuffer;
+    short		x, y;
+    unsigned short	width, height;
+    Bool		exposures;
+{
+    WindowPtr pWin;
+    ScreenPtr pScreen;
+    BoxRec box;
+    RegionRec region;
+    int w_width, w_height;
+    DrawablePtr pDrawable;
+
+    pWin = pMBBuffer->pMBWindow->pWindow;
+    pScreen = pWin->drawable.pScreen;
+
+    w_width  = pWin->drawable.width;
+    w_height = pWin->drawable.height;
+
+    box.x1 = x;
+    box.y1 = y;
+    box.x2 = width  ? (box.x1 + width)  : w_width;
+    box.y2 = height ? (box.y1 + height) : w_height;
+
+    if (box.x1 < 0)        box.x1 = 0;
+    if (box.y1 < 0)        box.y1 = 0;
+    if (box.x2 > w_width)  box.x2 = w_width;
+    if (box.y2 > w_height) box.y2 = w_height;
+
+    REGION_INIT(pScreen, &region, &box, 1);
+
+    if (pMBBuffer->number == pMBBuffer->pMBWindow->displayedMultibuffer)
+      pDrawable = (DrawablePtr) pWin;
+    else
+      pDrawable = pMBBuffer->pDrawable;
+
+    MultibufferPaintBackgroundRegion(pWin, pDrawable, &region);
+
+    if (exposures)
+	MultibufferExpose(pMBBuffer, &region);
+
+    REGION_UNINIT(pScreen, &region);
+}
+
+static void
+pixDeleteBufferDrawable(pDrawable)
+    DrawablePtr	pDrawable;
+{
+    (* pDrawable->pScreen->DestroyPixmap)((PixmapPtr) pDrawable);
+}