vnchooks.cc

Informix Table extraction queries have been optimized

/* Copyright (C) 2002-2005 RealVNC Ltd.  All Rights Reserved.
 * 
 * This is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this software; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,
 * USA.
 */

#include <stdio.h>
#include "XserverDesktop.h"
#include "vncHooks.h"

extern "C" {
#define class c_class
#define private c_private
#include "scrnintstr.h"
#include "windowstr.h"
#include "gcstruct.h"
#include "regionstr.h"
#include "dixfontstr.h"
#include "colormapst.h"

#ifdef GC_HAS_COMPOSITE_CLIP
#define COMPOSITE_CLIP(gc) ((gc)->pCompositeClip)
#else
#include "mfb.h"
#define COMPOSITE_CLIP(gc) \
  (((mfbPrivGCPtr)((gc)->devPrivates[mfbGCPrivateIndex].ptr))->pCompositeClip)
#endif

#undef class
#undef private
}

#include "RegionHelper.h"

#define DBGPRINT(x) //(fprintf x)

// MAX_RECTS_PER_OP is the maximum number of rectangles we generate from
// operations like Polylines and PolySegment.  If the operation is more complex
// than this, we simply use the bounding box.  Ideally it would be a
// command-line option, but that would involve an extra malloc each time, so we
// fix it here.
#define MAX_RECTS_PER_OP 5

static unsigned long vncHooksGeneration = 0;

// vncHooksScreenRec and vncHooksGCRec contain pointers to the original
// functions which we "wrap" in order to hook the screen changes.  The screen
// functions are each wrapped individually, while the GC "funcs" and "ops" are
// wrapped as a unit.

typedef struct {
  XserverDesktop* desktop;

  CloseScreenProcPtr           CloseScreen;
  CreateGCProcPtr              CreateGC;
  PaintWindowBackgroundProcPtr PaintWindowBackground;
  PaintWindowBorderProcPtr     PaintWindowBorder;
  CopyWindowProcPtr            CopyWindow;
  ClearToBackgroundProcPtr     ClearToBackground;
  RestoreAreasProcPtr          RestoreAreas;
  InstallColormapProcPtr       InstallColormap;
  StoreColorsProcPtr           StoreColors;
  DisplayCursorProcPtr         DisplayCursor;
  ScreenBlockHandlerProcPtr    BlockHandler;
} vncHooksScreenRec, *vncHooksScreenPtr;

typedef struct {
    GCFuncs *wrappedFuncs;
    GCOps *wrappedOps;
} vncHooksGCRec, *vncHooksGCPtr;

static int vncHooksScreenIndex;
static int vncHooksGCIndex;


// screen functions

static Bool vncHooksCloseScreen(int i, ScreenPtr pScreen);
static Bool vncHooksCreateGC(GCPtr pGC);
static void vncHooksPaintWindowBackground(WindowPtr pWin, RegionPtr pRegion,
                                          int what);
static void vncHooksPaintWindowBorder(WindowPtr pWin, RegionPtr pRegion,
                                      int what);
static void vncHooksCopyWindow(WindowPtr pWin, DDXPointRec ptOldOrg,
                               RegionPtr pOldRegion);
static void vncHooksClearToBackground(WindowPtr pWin, int x, int y, int w,
                                      int h, Bool generateExposures);
static RegionPtr vncHooksRestoreAreas(WindowPtr pWin, RegionPtr prgnExposed);
static void vncHooksInstallColormap(ColormapPtr pColormap);
static void vncHooksStoreColors(ColormapPtr pColormap, int ndef,
                                xColorItem* pdef);
static Bool vncHooksDisplayCursor(ScreenPtr pScreen, CursorPtr cursor);
static void vncHooksBlockHandler(int i, pointer blockData, pointer pTimeout,
                                 pointer pReadmask);

// GC "funcs"

static void vncHooksValidateGC(GCPtr pGC, unsigned long changes,
                               DrawablePtr pDrawable);
static void vncHooksChangeGC(GCPtr pGC, unsigned long mask);
static void vncHooksCopyGC(GCPtr src, unsigned long mask, GCPtr dst);
static void vncHooksDestroyGC(GCPtr pGC);
static void vncHooksChangeClip(GCPtr pGC, int type, pointer pValue,int nrects);
static void vncHooksDestroyClip(GCPtr pGC);
static void vncHooksCopyClip(GCPtr dst, GCPtr src);

static GCFuncs vncHooksGCFuncs = {
  vncHooksValidateGC, vncHooksChangeGC, vncHooksCopyGC, vncHooksDestroyGC,
  vncHooksChangeClip, vncHooksDestroyClip, vncHooksCopyClip,
};

// GC "ops"

static void vncHooksFillSpans(DrawablePtr pDrawable, GCPtr pGC, int nInit,
                              DDXPointPtr pptInit, int *pwidthInit,
                              int fSorted);
static void vncHooksSetSpans(DrawablePtr pDrawable, GCPtr pGC, char *psrc,
                             DDXPointPtr ppt, int *pwidth, int nspans,
                             int fSorted);
static void vncHooksPutImage(DrawablePtr pDrawable, GCPtr pGC, int depth,
                             int x, int y, int w, int h, int leftPad,
                             int format, char *pBits);
static RegionPtr vncHooksCopyArea(DrawablePtr pSrc, DrawablePtr pDst,
                                  GCPtr pGC, int srcx, int srcy, int w, int h,
                                  int dstx, int dsty);
static RegionPtr vncHooksCopyPlane(DrawablePtr pSrc, DrawablePtr pDst,
                                   GCPtr pGC, int srcx, int srcy, int w, int h,
                                   int dstx, int dsty, unsigned long plane);
static void vncHooksPolyPoint(DrawablePtr pDrawable, GCPtr pGC, int mode,
                              int npt, xPoint *pts);
static void vncHooksPolylines(DrawablePtr pDrawable, GCPtr pGC, int mode,
                              int npt, DDXPointPtr ppts);
static void vncHooksPolySegment(DrawablePtr pDrawable, GCPtr pGC, int nseg,
                                xSegment *segs);
static void vncHooksPolyRectangle(DrawablePtr pDrawable, GCPtr pGC, int nrects,
                                  xRectangle *rects);
static void vncHooksPolyArc(DrawablePtr pDrawable, GCPtr pGC, int narcs,
                            xArc *arcs);
static void vncHooksFillPolygon(DrawablePtr pDrawable, GCPtr pGC, int shape,
                                int mode, int count, DDXPointPtr pts);
static void vncHooksPolyFillRect(DrawablePtr pDrawable, GCPtr pGC, int nrects,
                                 xRectangle *rects);
static void vncHooksPolyFillArc(DrawablePtr pDrawable, GCPtr pGC, int narcs,
                                xArc *arcs);
static int vncHooksPolyText8(DrawablePtr pDrawable, GCPtr pGC, int x, int y,
                             int count, char *chars);
static int vncHooksPolyText16(DrawablePtr pDrawable, GCPtr pGC, int x, int y,
                              int count, unsigned short *chars);
static void vncHooksImageText8(DrawablePtr pDrawable, GCPtr pGC, int x, int y,
                               int count, char *chars);
static void vncHooksImageText16(DrawablePtr pDrawable, GCPtr pGC, int x, int y,
                                int count, unsigned short *chars);
static void vncHooksImageGlyphBlt(DrawablePtr pDrawable, GCPtr pGC, int x,
                                  int y, unsigned int nglyph,
                                  CharInfoPtr *ppci, pointer pglyphBase);
static void vncHooksPolyGlyphBlt(DrawablePtr pDrawable, GCPtr pGC, int x,
                                 int y, unsigned int nglyph,
                                 CharInfoPtr *ppci, pointer pglyphBase);
static void vncHooksPushPixels(GCPtr pGC, PixmapPtr pBitMap,
                               DrawablePtr pDrawable, int w, int h, int x,
                               int y);

static GCOps vncHooksGCOps = {
  vncHooksFillSpans, vncHooksSetSpans, vncHooksPutImage, vncHooksCopyArea,
  vncHooksCopyPlane, vncHooksPolyPoint, vncHooksPolylines, vncHooksPolySegment,
  vncHooksPolyRectangle, vncHooksPolyArc, vncHooksFillPolygon,
  vncHooksPolyFillRect, vncHooksPolyFillArc, vncHooksPolyText8,
  vncHooksPolyText16, vncHooksImageText8, vncHooksImageText16,
  vncHooksImageGlyphBlt, vncHooksPolyGlyphBlt, vncHooksPushPixels
};



/////////////////////////////////////////////////////////////////////////////
// vncHooksInit() is called at initialisation time and every time the server
// resets.  It is called once for each screen, but the indexes are only
// allocated once for each server generation.

Bool vncHooksInit(ScreenPtr pScreen, XserverDesktop* desktop)
{
  vncHooksScreenPtr vncHooksScreen;

  if (vncHooksGeneration != serverGeneration) {
    vncHooksGeneration = serverGeneration;

    vncHooksScreenIndex = AllocateScreenPrivateIndex();
    if (vncHooksScreenIndex < 0) {
      ErrorF("vncHooksInit: AllocateScreenPrivateIndex failed\n");
      return FALSE;
    }

    vncHooksGCIndex = AllocateGCPrivateIndex();
    if (vncHooksGCIndex < 0) {
      ErrorF("vncHooksInit: AllocateGCPrivateIndex failed\n");
      return FALSE;
    }
  }

  if (!AllocateGCPrivate(pScreen, vncHooksGCIndex, sizeof(vncHooksGCRec))) {
    ErrorF("vncHooksInit: AllocateGCPrivate failed\n");
    return FALSE;
  }

  vncHooksScreen = (vncHooksScreenPtr)xnfalloc(sizeof(vncHooksScreenRec));
  pScreen->devPrivates[vncHooksScreenIndex].ptr = (pointer)vncHooksScreen;

  vncHooksScreen->desktop = desktop;

  vncHooksScreen->CloseScreen = pScreen->CloseScreen;
  vncHooksScreen->CreateGC = pScreen->CreateGC;
  vncHooksScreen->PaintWindowBackground = pScreen->PaintWindowBackground;
  vncHooksScreen->PaintWindowBorder = pScreen->PaintWindowBorder;
  vncHooksScreen->CopyWindow = pScreen->CopyWindow;
  vncHooksScreen->ClearToBackground = pScreen->ClearToBackground;
  vncHooksScreen->RestoreAreas = pScreen->RestoreAreas;
  vncHooksScreen->InstallColormap = pScreen->InstallColormap;
  vncHooksScreen->StoreColors = pScreen->StoreColors;
  vncHooksScreen->DisplayCursor = pScreen->DisplayCursor;
  vncHooksScreen->BlockHandler = pScreen->BlockHandler;

  pScreen->CloseScreen = vncHooksCloseScreen;
  pScreen->CreateGC = vncHooksCreateGC;
  pScreen->PaintWindowBackground = vncHooksPaintWindowBackground;
  pScreen->PaintWindowBorder = vncHooksPaintWindowBorder;
  pScreen->CopyWindow = vncHooksCopyWindow;
  pScreen->ClearToBackground = vncHooksClearToBackground;
  pScreen->RestoreAreas = vncHooksRestoreAreas;
  pScreen->InstallColormap = vncHooksInstallColormap;
  pScreen->StoreColors = vncHooksStoreColors;
  pScreen->DisplayCursor = vncHooksDisplayCursor;
  pScreen->BlockHandler = vncHooksBlockHandler;

  return TRUE;
}



/////////////////////////////////////////////////////////////////////////////
//
// screen functions
//

// SCREEN_UNWRAP and SCREEN_REWRAP unwrap and rewrap the given screen function.
// It would be nice to do this with a C++ class, but each function is of a
// distinct type, so it would have to use templates, and it's not worth that
// much pain.

#define SCREEN_UNWRAP(scrn,field)                                         \
  ScreenPtr pScreen = scrn;                                               \
  vncHooksScreenPtr vncHooksScreen                                        \
    = ((vncHooksScreenPtr)pScreen->devPrivates[vncHooksScreenIndex].ptr); \
  pScreen->field = vncHooksScreen->field;                                 \
  DBGPRINT((stderr,"vncHooks" #field " called\n"));

#define SCREEN_REWRAP(field) pScreen->field = vncHooks##field;


// CloseScreen - unwrap the screen functions and call the original CloseScreen
// function

static Bool vncHooksCloseScreen(int i, ScreenPtr pScreen_)
{
  SCREEN_UNWRAP(pScreen_, CloseScreen);

  pScreen->CreateGC = vncHooksScreen->CreateGC;
  pScreen->PaintWindowBackground = vncHooksScreen->PaintWindowBackground;
  pScreen->PaintWindowBorder = vncHooksScreen->PaintWindowBorder;
  pScreen->CopyWindow = vncHooksScreen->CopyWindow;
  pScreen->ClearToBackground = vncHooksScreen->ClearToBackground;
  pScreen->RestoreAreas = vncHooksScreen->RestoreAreas;
  pScreen->InstallColormap = vncHooksScreen->InstallColormap;
  pScreen->StoreColors = vncHooksScreen->StoreColors;
  pScreen->DisplayCursor = vncHooksScreen->DisplayCursor;
  pScreen->BlockHandler = vncHooksScreen->BlockHandler;

  xfree((pointer)vncHooksScreen);

  DBGPRINT((stderr,"vncHooksCloseScreen: unwrapped screen functions\n"));

  return (*pScreen->CloseScreen)(i, pScreen);
}

// CreateGC - wrap the "GC funcs"

static Bool vncHooksCreateGC(GCPtr pGC)
{
  SCREEN_UNWRAP(pGC->pScreen, CreateGC);
    
  vncHooksGCPtr vncHooksGC
    = (vncHooksGCPtr)pGC->devPrivates[vncHooksGCIndex].ptr;

  Bool ret = (*pScreen->CreateGC) (pGC);

  vncHooksGC->wrappedOps = 0;
  vncHooksGC->wrappedFuncs = pGC->funcs;
  pGC->funcs = &vncHooksGCFuncs;

  SCREEN_REWRAP(CreateGC);

  return ret;
}

// PaintWindowBackground - changed region is the given region

static void vncHooksPaintWindowBackground(WindowPtr pWin, RegionPtr pRegion,
                                          int what)
{
  SCREEN_UNWRAP(pWin->drawable.pScreen, PaintWindowBackground);

  RegionHelper changed(pScreen, pRegion);

  (*pScreen->PaintWindowBackground) (pWin, pRegion, what);

  vncHooksScreen->desktop->add_changed(changed.reg);

  SCREEN_REWRAP(PaintWindowBackground);
}

// PaintWindowBorder - changed region is the given region

static void vncHooksPaintWindowBorder(WindowPtr pWin, RegionPtr pRegion,
                                      int what)
{
  SCREEN_UNWRAP(pWin->drawable.pScreen, PaintWindowBorder);

  RegionHelper changed(pScreen, pRegion);

  (*pScreen->PaintWindowBorder) (pWin, pRegion, what);

  vncHooksScreen->desktop->add_changed(changed.reg);

  SCREEN_REWRAP(PaintWindowBorder);
}

// CopyWindow - destination of the copy is the old region, clipped by
// borderClip, translated by the delta.  This call only does the copy - it
// doesn't affect any other bits.

static void vncHooksCopyWindow(WindowPtr pWin, DDXPointRec ptOldOrg,
                               RegionPtr pOldRegion)
{
  SCREEN_UNWRAP(pWin->drawable.pScreen, CopyWindow);

  RegionHelper copied(pScreen, pOldRegion);
  int dx = pWin->drawable.x - ptOldOrg.x;
  int dy = pWin->drawable.y - ptOldOrg.y;
  REGION_TRANSLATE(pScreen, copied.reg, dx, dy);
  REGION_INTERSECT(pWin->drawable.pScreen, copied.reg, copied.reg,
                   &pWin->borderClip);

  (*pScreen->CopyWindow) (pWin, ptOldOrg, pOldRegion);

  vncHooksScreen->desktop->add_copied(copied.reg, dx, dy);

  SCREEN_REWRAP(CopyWindow);
}