1 /* 2 * Copyright (c) 1996, 2006, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 #ifndef AWT_GDIOBJECT_H 27 #define AWT_GDIOBJECT_H 28 29 #include "awt.h" 30 #include "Hashtable.h" 31 #include "GDIHashtable.h" 32 33 #define MEMORY_OVER_SPEED 1 34 35 typedef struct { 36 HDC hDC; 37 BOOL gdiLimitReached; 38 } GetDCReturnStruct; 39 40 /* 41 * An AwtGDIObject is a cached, color-based GDI object, such as a pen or 42 * brush. This class also includes static methods for tracking the 43 * total number of active GDI Objects (Pen, Brush, and HDC). 44 */ 45 class AwtGDIObject { 46 public: GetColor()47 INLINE COLORREF GetColor() { return m_color; } SetColor(COLORREF color)48 INLINE void SetColor(COLORREF color) { m_color = color; } 49 GetHandle()50 INLINE HGDIOBJ GetHandle() { return m_handle; } SetHandle(HGDIOBJ handle)51 INLINE void SetHandle(HGDIOBJ handle) { m_handle = handle; } 52 53 /* 54 * NOTE: we don't syncronize access to the reference counter. 55 * Currently it is changed only when we are already synchronized 56 * on the global BatchDestructionManager lock. 57 */ GetRefCount()58 INLINE int GetRefCount() { return m_refCount; } IncrRefCount()59 INLINE int IncrRefCount() { return ++m_refCount; } DecrRefCount()60 INLINE int DecrRefCount() { return --m_refCount; } 61 62 /* 63 * Decrement the reference count of a cached GDI object. When it hits 64 * zero, notify the cache that the object can be safely removed. 65 * The cache will eventually delete the GDI object and this wrapper. 66 */ Release()67 INLINE void Release() { 68 #if MEMORY_OVER_SPEED 69 ReleaseInCache(); 70 #endif 71 } 72 73 // Workaround for Windows bug: do not let process have more than 74 // a set number of active (unreleased) GDI objects at any given time. 75 static BOOL IncrementIfAvailable(); 76 static void Decrement(); 77 static BOOL EnsureGDIObjectAvailability(); 78 79 protected: 80 /* 81 * Get a GDI object from its respective cache. If it doesn't exist 82 * it gets created, otherwise its reference count gets bumped. 83 */ 84 static AwtGDIObject* Get(COLORREF color); 85 86 virtual void ReleaseInCache() = 0; 87 AwtGDIObject()88 INLINE AwtGDIObject() { 89 m_handle = NULL; 90 m_refCount = 0; 91 } 92 ~AwtGDIObject()93 virtual ~AwtGDIObject() { 94 if (m_handle != NULL) { 95 ::DeleteObject(m_handle); 96 Decrement(); 97 } 98 } 99 100 private: 101 static int GetMaxGDILimit(); 102 103 COLORREF m_color; 104 HGDIOBJ m_handle; 105 int m_refCount; 106 static CriticalSection* objectCounterLock; 107 static int numCurrentObjects; 108 static int maxGDIObjects; 109 }; 110 111 #endif // AWT_GDIOBJECT_H 112