288 lines
8.8 KiB
C
288 lines
8.8 KiB
C
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//*****************************************************************************
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//
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// DC Cacheing -
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//
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// Support for misbehaved apps - which continue to use a DC that has been
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// Released. Well the problem is WIN30 allows it, so we need to be
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// compatible.
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//
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//
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// 03-Feb-92 NanduriR Created.
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//
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//*****************************************************************************
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#include "precomp.h"
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#pragma hdrstop
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MODNAME(wreldc.c);
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BOOL GdiCleanCacheDC (HDC hdc16);
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//*****************************************************************************
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// count of currently cached DCs so that we can quickly check whether any
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// ReleasedDCs are pending.
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//
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//*****************************************************************************
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INT iReleasedDCs = 0;
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//*****************************************************************************
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// The head of the linked list of the DCs Info.
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//
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//*****************************************************************************
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LPDCCACHE lpDCCache = NULL;
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//*****************************************************************************
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// ReleaseCachedDCs -
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// ReleaseDC's a cached DC if it meets the 'search criterion'.
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// The Search flag indicates which input arguments will be used.
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// Unused arguments can be NULL or pure garbage.
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//
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// NOTE: this does not free the memory that has been allocated for
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// the list.
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//
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// We reset the flag 'flState' and thus will be able to
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// reuse the structure.
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//
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// Returns TRUE
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//*****************************************************************************
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BOOL ReleaseCachedDCs(HAND16 htask16, HAND16 hwnd16, HAND16 hdc16,
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HWND hwnd32, UINT flSearch)
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{
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HAND16 hdcTemp;
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LPDCCACHE lpT;
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UNREFERENCED_PARAMETER(hdc16);
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if (iReleasedDCs) {
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for (lpT = lpDCCache; lpT != NULL; lpT = lpT->lpNext) {
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if (!(lpT->flState & DCCACHE_STATE_RELPENDING))
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continue;
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hdcTemp = (HAND16)NULL;
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if (flSearch & SRCHDC_TASK16_HWND16) {
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if (lpT->htask16 == htask16 &&
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lpT->hwnd16 == hwnd16)
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hdcTemp = lpT->hdc16;
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}
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else if (flSearch & SRCHDC_TASK16) {
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if (lpT->htask16 == htask16)
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hdcTemp = lpT->hdc16;
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}
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else {
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LOGDEBUG(0, ("ReleaseCachedDCs:Invalid Search Flag\n"));
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}
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if (hdcTemp) {
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if (ReleaseDC(lpT->hwnd32, HDC32(hdcTemp))) {
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LOGDEBUG(6,
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("ReleaseCachedDCs: success hdc16 %04x - count %04x\n",
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hdcTemp, (iReleasedDCs-1)));
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}
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else {
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LOGDEBUG(7, ("ReleaseCachedDCs: FAILED hdc16 %04x\n",
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hdcTemp));
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}
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// reset the state evenif ReleaseDC failed
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lpT->flState = 0;
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if (!(--iReleasedDCs))
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break;
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}
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}
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}
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return TRUE;
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}
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//*****************************************************************************
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// FreeCachedDCs -
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// ReleaseDC's a cached DC - Normally called during taskexit.
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//
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// NOTE: this does not free the memory that has been allocated for
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// the list.
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//
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// We reset the flag 'flState' and thus will be able to
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// reuse the structure.
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//
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// Returns TRUE
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//*****************************************************************************
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BOOL FreeCachedDCs(HAND16 htask16)
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{
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HAND16 hdcTemp;
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LPDCCACHE lpT;
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for (lpT = lpDCCache; lpT != NULL; lpT = lpT->lpNext) {
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if ((lpT->flState & DCCACHE_STATE_INUSE) &&
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lpT->htask16 == htask16) {
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hdcTemp = lpT->hdc16;
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if (lpT->flState & DCCACHE_STATE_RELPENDING) {
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if (ReleaseDC(lpT->hwnd32, HDC32(hdcTemp))) {
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LOGDEBUG(6,
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("FreeCachedDCs: success hdc16 %04x - task %04x\n",
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hdcTemp, htask16));
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}
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else {
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LOGDEBUG(7, ("FreeCachedDCs: FAILED hdc16 %04x - task %04x\n",
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hdcTemp, htask16));
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}
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WOW32ASSERT(iReleasedDCs != 0);
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--iReleasedDCs;
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}
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lpT->flState = 0;
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}
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}
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return TRUE;
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}
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//*****************************************************************************
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// StoredDC -
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//
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// Initializes a DCCACHE structure with appropriate values.
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// Uses an empty slot in the linked list if available else
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// allocates a new one and adds to the head of the list.
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//
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// Returns TRUE on success, FALSE on failure
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//*****************************************************************************
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BOOL StoreDC(HAND16 htask16, HAND16 hwnd16, HAND16 hdc16)
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{
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HAND16 hdcTemp = (HAND16)NULL;
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LPDCCACHE lpT, lpNew;
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// Check for an 'inuse' slot that will match the one that will be created
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// or check for an empty slot.
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//
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// An existing 'inuse' slot may match the one that's being created if
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// an app makes multiple calls to GetDC(hwnd) without an intervening
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// ReleaseDC. eg. MathCad.
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// - Nanduri
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lpNew = (LPDCCACHE)NULL;
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for (lpT = lpDCCache; lpT != NULL; lpT = lpT->lpNext) {
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if (lpT->flState & DCCACHE_STATE_INUSE) {
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if (lpT->hdc16 == hdc16) {
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if (lpT->hwnd16 == hwnd16 &&
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lpT->htask16 == htask16 ) {
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LOGDEBUG(6, ("WOW:An identical second GetDC call without ReleaseDC\n"));
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}
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else {
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LOGDEBUG(6, ("WOW:New DC 0x%04x exists - replacing old cache\n", hdc16));
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}
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if (lpT->flState & DCCACHE_STATE_RELPENDING) {
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WOW32ASSERT(iReleasedDCs != 0);
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--iReleasedDCs;
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}
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lpNew = lpT;
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break;
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}
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}
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else {
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if (!lpNew)
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lpNew = lpT;
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}
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}
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lpT = lpNew;
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if (lpT == NULL) {
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lpT = (LPDCCACHE)malloc_w_small(sizeof(DCCACHE));
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if (lpT) {
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lpT->lpNext = lpDCCache;
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lpDCCache = lpT;
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}
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else {
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LOGDEBUG(0, ("StoreDC: malloc_w_small for cache failed\n"));
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}
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}
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if (lpT != NULL) {
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lpT->flState = DCCACHE_STATE_INUSE;
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lpT->htask16 = htask16;
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lpT->hwnd16 = hwnd16;
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lpT->hdc16 = hdc16;
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lpT->hwnd32 = HWND32(hwnd16);
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LOGDEBUG(6, ("StoreDC: Added hdc %04x\n",hdc16));
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return TRUE;
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}
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else
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return FALSE;
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}
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//*****************************************************************************
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// CacheReleasedDC -
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//
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// Increments iReleasedDCs to indicate that a ReleaseDC is pending.
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//
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// Increments the iReleasedDC only if there was a corresponding GetDC.
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// i.e, only if the DC exists in the DCcache;
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//
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// This is to handle the scenrio below:
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// hdc = BeginPaint(hwnd,..);
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// ReleaseDC(hwnd, hdc);
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// EndPaint(hwnd, ..);
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//
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//
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// Returns TRUE on success, FALSE on failure
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//*****************************************************************************
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BOOL CacheReleasedDC(HAND16 htask16, HAND16 hwnd16, HAND16 hdc16)
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{
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HAND16 hdcTemp = (HAND16)NULL;
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LPDCCACHE lpT;
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for (lpT = lpDCCache; lpT != NULL; lpT = lpT->lpNext) {
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if ((lpT->flState & DCCACHE_STATE_INUSE) &&
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lpT->htask16 == htask16 &&
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lpT->hwnd16 == hwnd16 &&
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lpT->hdc16 == hdc16 ) {
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// the app might do releasedc twice on the same dc by mistake
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if (!(lpT->flState & DCCACHE_STATE_RELPENDING)) {
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lpT->flState |= DCCACHE_STATE_RELPENDING;
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iReleasedDCs++;
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}
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LOGDEBUG(6, ("CachedReleasedDC: Pending hdc %04x - count %04x\n",
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hdc16, iReleasedDCs));
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GdiCleanCacheDC (HDC32(hdc16));
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// Fix apps that draw then do lots
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// of disk activity, usually they do
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// a releaseDC. This flush will syncronize
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// the drawing with the beginning of the
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// disk activity. Bug #9704 PackRats install program draws text too late
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GdiFlush();
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return TRUE;
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}
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}
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return FALSE;
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}
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