// $Id: colclist.cpp 1282 2006-06-09 09:46:49Z alex $ /* @@tag:xara-cn@@ DO NOT MODIFY THIS LINE ================================XARAHEADERSTART=========================== Xara LX, a vector drawing and manipulation program. Copyright (C) 1993-2006 Xara Group Ltd. Copyright on certain contributions may be held in joint with their respective authors. See AUTHORS file for details. LICENSE TO USE AND MODIFY SOFTWARE ---------------------------------- This file is part of Xara LX. Xara LX is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License version 2 as published by the Free Software Foundation. Xara LX and its component source files are 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. 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Xara Group Ltd, Gaddesden Place, Hemel Hempstead, HP2 6EX, UK. http://www.xara.com/ =================================XARAHEADEREND============================ */ // colclist.cpp - the ColourContextList class /* */ #include "camtypes.h" #include "colcontx.h" //#include "doccolor.h" - in camtypes.h [AUTOMATICALLY REMOVED] //#include "ensure.h" - in camtypes.h [AUTOMATICALLY REMOVED] CC_IMPLEMENT_MEMDUMP(ColourContextList, List) // Declare smart memory handling in Debug builds #define new CAM_DEBUG_NEW /* ColContextList * * This is a 'global' pointer to a list of colour context objects * It is used to ensure that no colour contexts are ever repeated (i.e. they * are shared wherever possible). Only users of this file have access to this * list. * Access is via the static function ColourContextList::GetList() */ ColourContextList *ColourContextList::ColContextList = NULL; /******************************************************************************************** > static BOOL ColourContextList::InitColourContexts(void) Author: Jason_Williams (Xara Group Ltd) Created: 11/04/94 Inputs: - Outputs: - Returns: TRUE if initialisation succeeded, else FALSE FALSE if it failed (most likely because of lack of memory) Purpose: Initialises the Colour Context system, setting up the global list of default colour contexts which are shared by all documents. Called from app.cpp (must not be called more than once) Errors: - ********************************************************************************************/ BOOL ColourContextList::InitColourContexts(void) { ENSURE(ColContextList == NULL, "ColourContextList::InitColourContexts called more than once!"); // First, create the global Colour context list in which all colour contexts // should be registered. ColContextList = new ColourContextList; if (ColContextList == NULL) return(FALSE); // Now, create an instance of each available colour context to provide the // global set of default colour contexts. Add each to the CCList. ColourContext *tempcc; tempcc = new ColourContextRGBT(NULL, 1.0); // --- RGBT if (tempcc == NULL) return(FALSE); ColContextList->AddContext(&tempcc); ColourContext::SetGlobalDefault(COLOURMODEL_RGBT, tempcc); tempcc = new ColourContextCMYK(NULL); // --- CMYK if (tempcc == NULL) return(FALSE); ColContextList->AddContext(&tempcc); ColourContext::SetGlobalDefault(COLOURMODEL_CMYK, tempcc); tempcc = new ColourContextHSVT(NULL); // --- HSVT if (tempcc == NULL) return(FALSE); ColContextList->AddContext(&tempcc); ColourContext::SetGlobalDefault(COLOURMODEL_HSVT, tempcc); tempcc = new ColourContextGreyT(NULL); // --- GreyT if (tempcc == NULL) return(FALSE); ColContextList->AddContext(&tempcc); ColourContext::SetGlobalDefault(COLOURMODEL_GREYT, tempcc); #ifndef DISABLE_WEBRGBT tempcc = new ColourContextWebRGBT(NULL); // --- WebRBGT if (tempcc == NULL) return(FALSE); ColContextList->AddContext(&tempcc); ColourContext::SetGlobalDefault(COLOURMODEL_WEBRGBT, tempcc); #endif // --- etc... return(TRUE); } /******************************************************************************************** > static void ColourContextList::DeinitColourContexts(void) Author: Jason_Williams (Xara Group Ltd) Created: 11/04/94 Inputs: - Outputs: - Returns: - Purpose: De-initialises the Colour Context system, deleting the global list of default colour contexts which are shared by all documents. It is assumed that by this time the contexts should not be in use! Called from app.cpp (must not be caled more than once) Errors: If any colour contexts are still in use when this function is called, you may get ENSURE failures. ********************************************************************************************/ void ColourContextList::DeinitColourContexts(void) { ENSURE(ColContextList != NULL, "ColourContextList::DeinitColourContexts: but I haven't been initialised yet!"); ColourContextArray DefaultCCA; ColourContext *DefaultCC; ColourContext::GetGlobalDefaults(&DefaultCCA); // Delete any of the default colour contexts that actually exist... for (INT32 cm = 0; cm < MAX_COLOURMODELS; cm++) { // Get the default colour context object for this colour model number // I do this via a copy of the real array to avoid the GetDefaultContext() // call giving an ENSURE failure in the case of a NULL context pointer. DefaultCC = DefaultCCA.Context[cm]; if (DefaultCC != NULL) { // Set the default to NULL to ensure fewer rampant pointers are // left lying around (just to be on the safe side) ColourContext::SetGlobalDefault((ColourModel) cm, NULL); // Remove from the list. Note that we use RemoveItem to *force* // removal - RemoveContext only removes it if UsageCount == 0. ColContextList->RemoveItem(DefaultCC); // Decrement usage. This *should* take it down to zero usage, as // it is hoped that by the time we are called, all other users will // have released their claims. We do this to stop the ENSURE from // triggering when we delete the object. DefaultCC->DecrementUsage(); // And delete the object delete DefaultCC; } } ENSURE(ColContextList->IsEmpty(), "ColourContextList::DeinitColourContexts: Some ColourContext(s) have not yet been released"); // And delete the global list of contexts delete ColContextList; ColContextList = NULL; } /******************************************************************************************** > void ColourContextList::AddContext(ColourContext **NewContext) Author: Jason_Williams (Xara Group Ltd) Created: 11/04/94 Inputs: - Outputs: An equivalent colour context that may now be used Returns: - Purpose: "Adds" the given colour context to the global list of available contexts. Note that if an identical context is already present in the list, the passed context will be DELETEd and the existing context will be returned in the given pointer. Thus, you must only ever access the context through the returned pointer, rather than the pointer that you originally allocated with 'new'. i.e. to create and use a new context, you must: { ColourContext *MyContext; MyContext = new ColourContextABCD(1.0); // Create new context if (MyContext == NULL) return(FAILED_MISERABLY); ColContextList->AddContext(&MyContext); // MyContext may change! MyContext->DoSomething... // Use the context ColContextList->RemoveContext(&MyContext); // Have finished with it // MyContext is now a NULL pointer, so don't use it! } Notes: You must NOT delete the context when you finish with it. Instead, you must call ColourContextList::RemoveContext() when you have finished with the context. The context will be automatically deleted when it is no longer in use by anyone. (Sharing of contexts is currently disabled - see the comment in the function for details) Errors: - SeeAlso: ColourContext::ConvertColour; ColourContext::ConvertColourInternal ********************************************************************************************/ void ColourContextList::AddContext(ColourContext **NewContext) { ENSURE(NewContext != NULL && *NewContext != NULL, "ColourContextList::AddContext called with NULL parameter!"); #if FALSE /* Jason 22/5/96 We no longer merge contexts because this makes for danger with the new ColourPlate system - it's now too easy to change a colourcontext by altering its ColourPlate, in which case shared contexts will cause extreme grief. ColourContext *Item; Item = (ColourContext *) GetHead(); while (Item) { if (!Item->IsDifferent(*NewContext)) // Have found identical context { delete *NewContext; // Delete the new context Item->IncrementUsage(); // Increment the new context's usage count *NewContext = Item; // And return the existing one for use return; } Item = (ColourContext *) GetNext(Item); } // We have searched the entore list now but still have no equivalent context // so it is necessary to add this context to the list, and return it. */ #endif // However, we do check that the given context is not already in the list, // and ignore the caller if it's already there. ColourContext *Item; Item = (ColourContext *) GetHead(); while (Item) { if (Item == *NewContext) { Item->IncrementUsage(); // Increment the context's usage count return; } Item = (ColourContext *) GetNext(Item); } AddTail(*NewContext); (*NewContext)->Init(); // And by leaving the contents of the passed pointer alone, we return it. } /******************************************************************************************** > void ColourContextList::RemoveContext(ColourContext **OldContext) Author: Jason_Williams (Xara Group Ltd) Created: 11/04/94 Inputs: - Outputs: - Returns: - Purpose: "Removes" the given colour context to the global list of available contexts. If the context is now no longer in use by anyone, it will be 'delete'd. The context pointer passed in will be set to NULL. Errors: - SeeAlso: ColourContextList::AddContext; ColourContext ********************************************************************************************/ void ColourContextList::RemoveContext(ColourContext **OldContext) { ENSURE(OldContext != NULL && *OldContext != NULL, "ColourContextList::RemoveContext called with NULL parameter!"); if (!((*OldContext)->DecrementUsage())) // Not still in use, so discard it { RemoveItem(*OldContext); delete *OldContext; } *OldContext = NULL; }