1 /* 2 * Copyright 2009, 2010, The Android Open Source Project 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * * Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * * Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #ifndef PlatformBridge_h 27 #define PlatformBridge_h 28 29 #include "FloatRect.h" 30 #include "KURL.h" 31 #include "PlatformString.h" 32 #include "npapi.h" 33 34 #include <wtf/Vector.h> 35 36 // V8 bindings use the ARRAYSIZE_UNSAFE macro. This macro was copied 37 // from http://src.chromium.org/viewvc/chrome/trunk/src/base/basictypes.h 38 // 39 // ARRAYSIZE_UNSAFE performs essentially the same calculation as arraysize, 40 // but can be used on anonymous types or types defined inside 41 // functions. It's less safe than arraysize as it accepts some 42 // (although not all) pointers. Therefore, you should use arraysize 43 // whenever possible. 44 // 45 // The expression ARRAYSIZE_UNSAFE(a) is a compile-time constant of type 46 // size_t. 47 // 48 // ARRAYSIZE_UNSAFE catches a few type errors. If you see a compiler error 49 // 50 // "warning: division by zero in ..." 51 // 52 // when using ARRAYSIZE_UNSAFE, you are (wrongfully) giving it a pointer. 53 // You should only use ARRAYSIZE_UNSAFE on statically allocated arrays. 54 // 55 // The following comments are on the implementation details, and can 56 // be ignored by the users. 57 // 58 // ARRAYSIZE_UNSAFE(arr) works by inspecting sizeof(arr) (the # of bytes in 59 // the array) and sizeof(*(arr)) (the # of bytes in one array 60 // element). If the former is divisible by the latter, perhaps arr is 61 // indeed an array, in which case the division result is the # of 62 // elements in the array. Otherwise, arr cannot possibly be an array, 63 // and we generate a compiler error to prevent the code from 64 // compiling. 65 // 66 // Since the size of bool is implementation-defined, we need to cast 67 // !(sizeof(a) & sizeof(*(a))) to size_t in order to ensure the final 68 // result has type size_t. 69 // 70 // This macro is not perfect as it wrongfully accepts certain 71 // pointers, namely where the pointer size is divisible by the pointee 72 // size. Since all our code has to go through a 32-bit compiler, 73 // where a pointer is 4 bytes, this means all pointers to a type whose 74 // size is 3 or greater than 4 will be (righteously) rejected. 75 76 #define ARRAYSIZE_UNSAFE(a) \ 77 ((sizeof(a) / sizeof(*(a))) / \ 78 static_cast<size_t>(!(sizeof(a) % sizeof(*(a))))) 79 80 81 class NPObject; 82 83 namespace WebCore { 84 85 class Document; 86 class FrameView; 87 class Node; 88 class ScrollView; 89 class Widget; 90 91 // An interface to the embedding layer, which has the ability to answer 92 // questions about the system and so on... 93 // This is very similar to chromium/PlatformBridge and the two are likely to converge 94 // in the future. 95 // 96 // The methods in this class all need to reach across a JNI layer to the Java VM 97 // where the embedder runs. The JNI machinery is currently all in WebKit/android 98 // but the long term plan is to move to the WebKit API and share the bridge and its 99 // implementation with Chromium. The JNI machinery will then move outside of WebKit, 100 // similarly to how Chromium's IPC layer lives outside of WebKit. 101 class PlatformBridge { 102 public: 103 // KeyGenerator 104 static WTF::Vector<String> getSupportedKeyStrengthList(); 105 static String getSignedPublicKeyAndChallengeString(unsigned index, const String& challenge, const KURL&); 106 // Cookies 107 static void setCookies(const Document*, const KURL&, const String& value); 108 static String cookies(const Document*, const KURL&); 109 static bool cookiesEnabled(const Document*); 110 // Plugin 111 static NPObject* pluginScriptableObject(Widget*); 112 // Popups 113 static bool popupsAllowed(NPP); 114 115 // These ids need to be in sync with the constants in BrowserFrame.java 116 enum rawResId { 117 NoDomain = 1, 118 LoadError, 119 DrawableDir, 120 FileUploadLabel, 121 ResetLabel, 122 SubmitLabel, 123 FileUploadNoFileChosenLabel 124 }; 125 static String* globalLocalizedName(rawResId resId); 126 127 static String resolveFilePathForContentUri(const String&); 128 129 static int screenDepth(); 130 static FloatRect screenRect(); 131 132 // Update the viewport meta data. 133 static void updateViewport(FrameView*); 134 135 static void updateTextfield(FrameView*, Node*, const WTF::String& text); 136 137 static void setScrollPosition(ScrollView*, int x, int y); 138 139 // Language 140 static String computeDefaultLanguage(); 141 // Memory details for V8 GC 142 static int lowMemoryUsageMB(); 143 static int highMemoryUsageMB(); 144 static int highUsageDeltaMB(); 145 static int memoryUsageMB(); 146 static int actualMemoryUsageMB(); 147 static bool canSatisfyMemoryAllocation(long bytes); 148 149 static int screenWidthInDocCoord(const FrameView*); 150 static int screenHeightInDocCoord(const FrameView*); 151 }; 152 153 } 154 #endif // PlatformBridge_h 155
