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xwayland/dbe/midbe.c

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Import Upstream version 21.1.0
2023-03-13 15:48:58 +08:00
/******************************************************************************
*
* Copyright (c) 1994, 1995 Hewlett-Packard Company
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* 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 HEWLETT-PACKARD COMPANY 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 Hewlett-Packard
* Company 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 Hewlett-Packard Company.
*
* Machine-independent DBE code
*
*****************************************************************************/
/* INCLUDES */
#ifdef HAVE_DIX_CONFIG_H
#include <dix-config.h>
#endif
#include <X11/X.h>
#include <X11/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 "dbestruct.h"
#include "regionstr.h"
#include "gcstruct.h"
#include "inputstr.h"
#include "midbe.h"
#include "xace.h"
#include <stdio.h>
/******************************************************************************
*
* DBE MI Procedure: miDbeGetVisualInfo
*
* Description:
*
* This is the MI function for the DbeGetVisualInfo request. This function
* is called through pDbeScreenPriv->GetVisualInfo. This function is also
* called for the DbeAllocateBackBufferName request at the extension level;
* it is called by ProcDbeAllocateBackBufferName() in dbe.c.
*
* If memory allocation fails or we can not get the visual info, this
* function returns FALSE. Otherwise, it returns TRUE for success.
*
*****************************************************************************/
static Bool
miDbeGetVisualInfo(ScreenPtr pScreen, XdbeScreenVisualInfo * pScrVisInfo)
{
register int i, j, k;
register int count;
DepthPtr pDepth;
XdbeVisualInfo *visInfo;
/* Determine number of visuals for this screen. */
for (i = 0, count = 0; i < pScreen->numDepths; i++) {
count += pScreen->allowedDepths[i].numVids;
}
/* Allocate an array of XdbeVisualInfo items. */
if (!(visInfo = xallocarray(count, sizeof(XdbeVisualInfo)))) {
return FALSE; /* memory alloc failure */
}
for (i = 0, k = 0; i < pScreen->numDepths; i++) {
/* For each depth of this screen, get visual information. */
pDepth = &pScreen->allowedDepths[i];
for (j = 0; j < pDepth->numVids; j++) {
/* For each visual for this depth of this screen, get visual ID
* and visual depth. Since this is MI code, we will always return
* the same performance level for all visuals (0). A higher
* performance level value indicates higher performance.
*/
visInfo[k].visual = pDepth->vids[j];
visInfo[k].depth = pDepth->depth;
visInfo[k].perflevel = 0;
k++;
}
}
/* Record the number of visuals and point visual_depth to
* the array of visual info.
*/
pScrVisInfo->count = count;
pScrVisInfo->visinfo = visInfo;
return TRUE; /* success */
} /* miDbeGetVisualInfo() */
/******************************************************************************
*
* DBE MI Procedure: miAllocBackBufferName
*
* Description:
*
* This is the MI function for the DbeAllocateBackBufferName request.
*
*****************************************************************************/
static int
miDbeAllocBackBufferName(WindowPtr pWin, XID bufId, int swapAction)
{
ScreenPtr pScreen;
DbeWindowPrivPtr pDbeWindowPriv;
DbeScreenPrivPtr pDbeScreenPriv;
GCPtr pGC;
xRectangle clearRect;
int rc;
pScreen = pWin->drawable.pScreen;
pDbeWindowPriv = DBE_WINDOW_PRIV(pWin);
if (pDbeWindowPriv->nBufferIDs == 0) {
/* There is no buffer associated with the window.
* We have to create the window priv priv. Remember, the window
* priv was created at the DIX level, so all we need to do is
* create the priv priv and attach it to the priv.
*/
pDbeScreenPriv = DBE_SCREEN_PRIV(pScreen);
/* Get a front pixmap. */
if (!(pDbeWindowPriv->pFrontBuffer =
(*pScreen->CreatePixmap) (pScreen, pDbeWindowPriv->width,
pDbeWindowPriv->height,
pWin->drawable.depth, 0))) {
return BadAlloc;
}
/* Get a back pixmap. */
if (!(pDbeWindowPriv->pBackBuffer =
(*pScreen->CreatePixmap) (pScreen, pDbeWindowPriv->width,
pDbeWindowPriv->height,
pWin->drawable.depth, 0))) {
(*pScreen->DestroyPixmap) (pDbeWindowPriv->pFrontBuffer);
return BadAlloc;
}
/* Security creation/labeling check. */
rc = XaceHook(XACE_RESOURCE_ACCESS, serverClient, bufId,
dbeDrawableResType, pDbeWindowPriv->pBackBuffer,
RT_WINDOW, pWin, DixCreateAccess);
/* Make the back pixmap a DBE drawable resource. */
if (rc != Success || !AddResource(bufId, dbeDrawableResType,
pDbeWindowPriv->pBackBuffer)) {
/* free the buffer and the drawable resource */
FreeResource(bufId, RT_NONE);
return (rc == Success) ? BadAlloc : rc;
}
/* Clear the back buffer. */
pGC = GetScratchGC(pWin->drawable.depth, pWin->drawable.pScreen);
if ((*pDbeScreenPriv->SetupBackgroundPainter) (pWin, pGC)) {
ValidateGC((DrawablePtr) pDbeWindowPriv->pBackBuffer, pGC);
clearRect.x = clearRect.y = 0;
clearRect.width = pDbeWindowPriv->pBackBuffer->drawable.width;
clearRect.height = pDbeWindowPriv->pBackBuffer->drawable.height;
(*pGC->ops->PolyFillRect) ((DrawablePtr) pDbeWindowPriv->
pBackBuffer, pGC, 1, &clearRect);
}
FreeScratchGC(pGC);
} /* if no buffer associated with the window */
else {
/* A buffer is already associated with the window.
* Place the new buffer ID information at the head of the ID list.
*/
/* Associate the new ID with an existing pixmap. */
if (!AddResource(bufId, dbeDrawableResType,
(void *) pDbeWindowPriv->pBackBuffer)) {
return BadAlloc;
}
}
return Success;
} /* miDbeAllocBackBufferName() */
/******************************************************************************
*
* DBE MI Procedure: miDbeAliasBuffers
*
* Description:
*
* This function associates all XIDs of a buffer with the back pixmap
* stored in the window priv.
*
*****************************************************************************/
static void
miDbeAliasBuffers(DbeWindowPrivPtr pDbeWindowPriv)
{
int i;
for (i = 0; i < pDbeWindowPriv->nBufferIDs; i++) {
ChangeResourceValue(pDbeWindowPriv->IDs[i], dbeDrawableResType,
(void *) pDbeWindowPriv->pBackBuffer);
}
} /* miDbeAliasBuffers() */
/******************************************************************************
*
* DBE MI Procedure: miDbeSwapBuffers
*
* Description:
*
* This is the MI function for the DbeSwapBuffers request.
*
*****************************************************************************/
static int
miDbeSwapBuffers(ClientPtr client, int *pNumWindows, DbeSwapInfoPtr swapInfo)
{
DbeScreenPrivPtr pDbeScreenPriv;
DbeWindowPrivPtr pDbeWindowPriv;
GCPtr pGC;
WindowPtr pWin;
PixmapPtr pTmpBuffer;
xRectangle clearRect;
pWin = swapInfo[0].pWindow;
pDbeScreenPriv = DBE_SCREEN_PRIV_FROM_WINDOW(pWin);
pDbeWindowPriv = DBE_WINDOW_PRIV(pWin);
pGC = GetScratchGC(pWin->drawable.depth, pWin->drawable.pScreen);
/*
**********************************************************************
** Setup before swap.
**********************************************************************
*/
switch (swapInfo[0].swapAction) {
case XdbeUndefined:
break;
case XdbeBackground:
break;
case XdbeUntouched:
ValidateGC((DrawablePtr) pDbeWindowPriv->pFrontBuffer, pGC);
(*pGC->ops->CopyArea) ((DrawablePtr) pWin,
(DrawablePtr) pDbeWindowPriv->pFrontBuffer,
pGC, 0, 0, pWin->drawable.width,
pWin->drawable.height, 0, 0);
break;
case XdbeCopied:
break;
}
/*
**********************************************************************
** Swap.
**********************************************************************
*/
ValidateGC((DrawablePtr) pWin, pGC);
(*pGC->ops->CopyArea) ((DrawablePtr) pDbeWindowPriv->pBackBuffer,
(DrawablePtr) pWin, pGC, 0, 0,
pWin->drawable.width, pWin->drawable.height, 0, 0);
/*
**********************************************************************
** Tasks after swap.
**********************************************************************
*/
switch (swapInfo[0].swapAction) {
case XdbeUndefined:
break;
case XdbeBackground:
if ((*pDbeScreenPriv->SetupBackgroundPainter) (pWin, pGC)) {
ValidateGC((DrawablePtr) pDbeWindowPriv->pBackBuffer, pGC);
clearRect.x = 0;
clearRect.y = 0;
clearRect.width = pDbeWindowPriv->pBackBuffer->drawable.width;
clearRect.height = pDbeWindowPriv->pBackBuffer->drawable.height;
(*pGC->ops->PolyFillRect) ((DrawablePtr) pDbeWindowPriv->
pBackBuffer, pGC, 1, &clearRect);
}
break;
case XdbeUntouched:
/* Swap pixmap pointers. */
pTmpBuffer = pDbeWindowPriv->pBackBuffer;
pDbeWindowPriv->pBackBuffer = pDbeWindowPriv->pFrontBuffer;
pDbeWindowPriv->pFrontBuffer = pTmpBuffer;
miDbeAliasBuffers(pDbeWindowPriv);
break;
case XdbeCopied:
break;
}
/* Remove the swapped window from the swap information array and decrement
* pNumWindows to indicate to the DIX level how many windows were actually
* swapped.
*/
if (*pNumWindows > 1) {
/* We were told to swap more than one window, but we only swapped the
* first one. Remove the first window in the list by moving the last
* window to the beginning.
*/
swapInfo[0].pWindow = swapInfo[*pNumWindows - 1].pWindow;
swapInfo[0].swapAction = swapInfo[*pNumWindows - 1].swapAction;
/* Clear the last window information just to be safe. */
swapInfo[*pNumWindows - 1].pWindow = (WindowPtr) NULL;
swapInfo[*pNumWindows - 1].swapAction = 0;
}
else {
/* Clear the window information just to be safe. */
swapInfo[0].pWindow = (WindowPtr) NULL;
swapInfo[0].swapAction = 0;
}
(*pNumWindows)--;
FreeScratchGC(pGC);
return Success;
} /* miSwapBuffers() */
/******************************************************************************
*
* DBE MI Procedure: miDbeWinPrivDelete
*
* Description:
*
* This is the MI function for deleting the dbeWindowPrivResType resource.
* This function is invoked indirectly by calling FreeResource() to free
* the resources associated with a DBE buffer ID. There are 5 ways that
* miDbeWinPrivDelete() can be called by FreeResource(). They are:
*
* - A DBE window is destroyed, in which case the DbeDestroyWindow()
* wrapper is invoked. The wrapper calls FreeResource() for all DBE
* buffer IDs.
*
* - miDbeAllocBackBufferName() calls FreeResource() to clean up resources
* after a buffer allocation failure.
*
* - The PositionWindow wrapper, miDbePositionWindow(), calls
* FreeResource() when it fails to create buffers of the new size.
* FreeResource() is called for all DBE buffer IDs.
*
* - FreeClientResources() calls FreeResource() when a client dies or the
* the server resets.
*
* When FreeResource() is called for a DBE buffer ID, the delete function
* for the only other type of DBE resource, dbeDrawableResType, is also
* invoked. This delete function (DbeDrawableDelete) is a NOOP to make
* resource deletion easier. It is not guaranteed which delete function is
* called first. Hence, we will let miDbeWinPrivDelete() free all DBE
* resources.
*
* This function deletes/frees the following stuff associated with
* the window private:
*
* - the ID node in the ID list representing the passed in ID.
*
* In addition, pDbeWindowPriv->nBufferIDs is decremented.
*
* If this function is called for the last/only buffer ID for a window,
* these are additionally deleted/freed:
*
* - the front and back pixmaps
* - the window priv itself
*
*****************************************************************************/
static void
miDbeWinPrivDelete(DbeWindowPrivPtr pDbeWindowPriv, XID bufId)
{
if (pDbeWindowPriv->nBufferIDs != 0) {
/* We still have at least one more buffer ID associated with this
* window.
*/
return;
}
/* We have no more buffer IDs associated with this window. We need to
* free some stuff.
*/
/* Destroy the front and back pixmaps. */
if (pDbeWindowPriv->pFrontBuffer) {
(*pDbeWindowPriv->pWindow->drawable.pScreen->
DestroyPixmap) (pDbeWindowPriv->pFrontBuffer);
}
if (pDbeWindowPriv->pBackBuffer) {
(*pDbeWindowPriv->pWindow->drawable.pScreen->
DestroyPixmap) (pDbeWindowPriv->pBackBuffer);
}
} /* miDbeWinPrivDelete() */
/******************************************************************************
*
* DBE MI Procedure: miDbePositionWindow
*
* Description:
*
* This function was cloned from miMbxPositionWindow() in mimultibuf.c.
* This function resizes the buffer when the window is resized.
*
*****************************************************************************/
static Bool
miDbePositionWindow(WindowPtr pWin, int x, int y)
{
ScreenPtr pScreen;
DbeScreenPrivPtr pDbeScreenPriv;
DbeWindowPrivPtr pDbeWindowPriv;
int width, height;
int dx, dy, dw, dh;
int sourcex, sourcey;
int destx, desty;
int savewidth, saveheight;
PixmapPtr pFrontBuffer;
PixmapPtr pBackBuffer;
Bool clear;
GCPtr pGC;
xRectangle clearRect;
Bool ret;
/*
**************************************************************************
** 1. Unwrap the member routine.
**************************************************************************
*/
pScreen = pWin->drawable.pScreen;
pDbeScreenPriv = DBE_SCREEN_PRIV(pScreen);
pScreen->PositionWindow = pDbeScreenPriv->PositionWindow;
/*
**************************************************************************
** 2. Do any work necessary before the member routine is called.
**
** In this case we do not need to do anything.
**************************************************************************
*/
/*
**************************************************************************
** 3. Call the member routine, saving its result if necessary.
**************************************************************************
*/
ret = (*pScreen->PositionWindow) (pWin, x, y);
/*
**************************************************************************
** 4. Rewrap the member routine, restoring the wrapper value first in case
** the wrapper (or something that it wrapped) change this value.
**************************************************************************
*/
pDbeScreenPriv->PositionWindow = pScreen->PositionWindow;
pScreen->PositionWindow = miDbePositionWindow;
/*
**************************************************************************
** 5. Do any work necessary after the member routine has been called.
**************************************************************************
*/
if (!(pDbeWindowPriv = DBE_WINDOW_PRIV(pWin))) {
return ret;
}
if (pDbeWindowPriv->width == pWin->drawable.width &&
pDbeWindowPriv->height == pWin->drawable.height) {
return ret;
}
width = pWin->drawable.width;
height = pWin->drawable.height;
dx = pWin->drawable.x - pDbeWindowPriv->x;
dy = pWin->drawable.y - pDbeWindowPriv->y;
dw = width - pDbeWindowPriv->width;
dh = height - pDbeWindowPriv->height;
GravityTranslate(0, 0, -dx, -dy, dw, dh, pWin->bitGravity, &destx, &desty);
clear = ((pDbeWindowPriv->width < (unsigned short) width) ||
(pDbeWindowPriv->height < (unsigned short) height) ||
(pWin->bitGravity == ForgetGravity));
sourcex = 0;
sourcey = 0;
savewidth = pDbeWindowPriv->width;
saveheight = pDbeWindowPriv->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;
}
pDbeWindowPriv->width = width;
pDbeWindowPriv->height = height;
pDbeWindowPriv->x = pWin->drawable.x;
pDbeWindowPriv->y = pWin->drawable.y;
pGC = GetScratchGC(pWin->drawable.depth, pScreen);
if (clear) {
if ((*pDbeScreenPriv->SetupBackgroundPainter) (pWin, pGC)) {
clearRect.x = 0;
clearRect.y = 0;
clearRect.width = width;
clearRect.height = height;
}
else {
clear = FALSE;
}
}
/* Create DBE buffer pixmaps equal to size of resized window. */
pFrontBuffer = (*pScreen->CreatePixmap) (pScreen, width, height,
pWin->drawable.depth, 0);
pBackBuffer = (*pScreen->CreatePixmap) (pScreen, width, height,
pWin->drawable.depth, 0);
if (!pFrontBuffer || !pBackBuffer) {
/* We failed at creating 1 or 2 of the pixmaps. */
if (pFrontBuffer) {
(*pScreen->DestroyPixmap) (pFrontBuffer);
}
if (pBackBuffer) {
(*pScreen->DestroyPixmap) (pBackBuffer);
}
/* Destroy all buffers for this window. */
while (pDbeWindowPriv) {
/* DbeWindowPrivDelete() will free the window private if there no
* more buffer IDs associated with this window.
*/
FreeResource(pDbeWindowPriv->IDs[0], RT_NONE);
pDbeWindowPriv = DBE_WINDOW_PRIV(pWin);
}
FreeScratchGC(pGC);
return FALSE;
}
else {
/* Clear out the new DBE buffer pixmaps. */
/* I suppose this could avoid quite a bit of work if
* it computed the minimal area required.
*/
ValidateGC(&pFrontBuffer->drawable, pGC);
if (clear) {
(*pGC->ops->PolyFillRect) ((DrawablePtr) pFrontBuffer, pGC, 1,
&clearRect);
}
/* Copy the contents of the old front pixmap to the new one. */
if (pWin->bitGravity != ForgetGravity) {
(*pGC->ops->CopyArea) ((DrawablePtr) pDbeWindowPriv->pFrontBuffer,
(DrawablePtr) pFrontBuffer, pGC,
sourcex, sourcey, savewidth, saveheight,
destx, desty);
}
ValidateGC(&pBackBuffer->drawable, pGC);
if (clear) {
(*pGC->ops->PolyFillRect) ((DrawablePtr) pBackBuffer, pGC, 1,
&clearRect);
}
/* Copy the contents of the old back pixmap to the new one. */
if (pWin->bitGravity != ForgetGravity) {
(*pGC->ops->CopyArea) ((DrawablePtr) pDbeWindowPriv->pBackBuffer,
(DrawablePtr) pBackBuffer, pGC,
sourcex, sourcey, savewidth, saveheight,
destx, desty);
}
/* Destroy the old pixmaps, and point the DBE window priv to the new
* pixmaps.
*/
(*pScreen->DestroyPixmap) (pDbeWindowPriv->pFrontBuffer);
(*pScreen->DestroyPixmap) (pDbeWindowPriv->pBackBuffer);
pDbeWindowPriv->pFrontBuffer = pFrontBuffer;
pDbeWindowPriv->pBackBuffer = pBackBuffer;
/* Make sure all XID are associated with the new back pixmap. */
miDbeAliasBuffers(pDbeWindowPriv);
FreeScratchGC(pGC);
}
return ret;
} /* miDbePositionWindow() */
/******************************************************************************
*
* DBE MI Procedure: miDbeInit
*
* Description:
*
* This is the MI initialization function called by DbeExtensionInit().
*
*****************************************************************************/
Bool
miDbeInit(ScreenPtr pScreen, DbeScreenPrivPtr pDbeScreenPriv)
{
/* Wrap functions. */
pDbeScreenPriv->PositionWindow = pScreen->PositionWindow;
pScreen->PositionWindow = miDbePositionWindow;
/* Initialize the per-screen DBE function pointers. */
pDbeScreenPriv->GetVisualInfo = miDbeGetVisualInfo;
pDbeScreenPriv->AllocBackBufferName = miDbeAllocBackBufferName;
pDbeScreenPriv->SwapBuffers = miDbeSwapBuffers;
pDbeScreenPriv->WinPrivDelete = miDbeWinPrivDelete;
return TRUE;
} /* miDbeInit() */