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Java example source code file (awt_GDIObject.h)
The awt_GDIObject.h Java example source code/* * Copyright (c) 1996, 2006, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code 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 * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ #ifndef AWT_GDIOBJECT_H #define AWT_GDIOBJECT_H #include "awt.h" #include "Hashtable.h" #include "GDIHashtable.h" #define MEMORY_OVER_SPEED 1 typedef struct { HDC hDC; BOOL gdiLimitReached; } GetDCReturnStruct; /* * An AwtGDIObject is a cached, color-based GDI object, such as a pen or * brush. This class also includes static methods for tracking the * total number of active GDI Objects (Pen, Brush, and HDC). */ class AwtGDIObject { public: INLINE COLORREF GetColor() { return m_color; } INLINE void SetColor(COLORREF color) { m_color = color; } INLINE HGDIOBJ GetHandle() { return m_handle; } INLINE void SetHandle(HGDIOBJ handle) { m_handle = handle; } /* * NOTE: we don't syncronize access to the reference counter. * Currently it is changed only when we are already synchronized * on the global BatchDestructionManager lock. */ INLINE int GetRefCount() { return m_refCount; } INLINE int IncrRefCount() { return ++m_refCount; } INLINE int DecrRefCount() { return --m_refCount; } /* * Decrement the reference count of a cached GDI object. When it hits * zero, notify the cache that the object can be safely removed. * The cache will eventually delete the GDI object and this wrapper. */ INLINE void Release() { #if MEMORY_OVER_SPEED ReleaseInCache(); #endif } // Workaround for Windows bug: do not let process have more than // a set number of active (unreleased) GDI objects at any given time. static BOOL IncrementIfAvailable(); static void Decrement(); static BOOL EnsureGDIObjectAvailability(); protected: /* * Get a GDI object from its respective cache. If it doesn't exist * it gets created, otherwise its reference count gets bumped. */ static AwtGDIObject* Get(COLORREF color); virtual void ReleaseInCache() = 0; INLINE AwtGDIObject() { m_handle = NULL; m_refCount = 0; } virtual ~AwtGDIObject() { if (m_handle != NULL) { ::DeleteObject(m_handle); Decrement(); } } private: static int GetMaxGDILimit(); COLORREF m_color; HGDIOBJ m_handle; int m_refCount; static CriticalSection* objectCounterLock; static int numCurrentObjects; static int maxGDIObjects; }; #endif // AWT_GDIOBJECT_H Other Java examples (source code examples)Here is a short list of links related to this Java awt_GDIObject.h source code file: |
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