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* Copyright (C) 2012 Google Inc. All rights reserved.
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
#ifndef Platform_h
#define Platform_h
#ifdef WIN32
#include <windows.h>
#include "WebAudioDevice.h"
#include "WebCommon.h"
#include "WebData.h"
#include "WebGamepads.h"
#include "WebGraphicsContext3D.h"
#include "WebLocalizedString.h"
#include "WebSpeechSynthesizer.h"
#include "WebStorageQuotaType.h"
#include "WebString.h"
#include "WebURLError.h"
#include "WebVector.h"
class GrContext;
namespace WebKit {
class WebAudioBus;
class WebBlobRegistry;
class WebContentDecryptionModule;
class WebClipboard;
class WebCompositorSupport;
class WebCookieJar;
class WebCrypto;
class WebDeviceMotionListener;
class WebDeviceOrientationListener;
class WebDiscardableMemory;
class WebFallbackThemeEngine;
class WebFileSystem;
class WebFileUtilities;
class WebFlingAnimator;
class WebGestureCurveTarget;
class WebGestureCurve;
class WebGraphicsContext3DProvider;
class WebIDBFactory;
class WebMIDIAccessor;
class WebMIDIAccessorClient;
class WebMediaStreamCenter;
class WebMediaStreamCenterClient;
class WebMessagePortChannel;
class WebMimeRegistry;
class WebPluginListBuilder;
class WebPrescientNetworking;
class WebRTCPeerConnectionHandler;
class WebRTCPeerConnectionHandlerClient;
class WebSandboxSupport;
class WebSocketHandle;
class WebSocketStreamHandle;
class WebSpeechSynthesizer;
class WebSpeechSynthesizerClient;
class WebStorageNamespace;
class WebStorageQuotaCallbacks;
class WebUnitTestSupport;
class WebThemeEngine;
class WebThread;
class WebURL;
class WebURLLoader;
class WebWorkerRunLoop;
struct WebFloatPoint;
struct WebLocalizedString;
struct WebSize;
class Platform {
// HTML5 Database ------------------------------------------------------
#ifdef WIN32
typedef HANDLE FileHandle;
typedef int FileHandle;
BLINK_PLATFORM_EXPORT static void initialize(Platform*);
BLINK_PLATFORM_EXPORT static void shutdown();
BLINK_PLATFORM_EXPORT static Platform* current();
// May return null.
virtual WebCookieJar* cookieJar() { return 0; }
// Must return non-null.
virtual WebClipboard* clipboard() { return 0; }
// Must return non-null.
virtual WebFileUtilities* fileUtilities() { return 0; }
// Must return non-null.
virtual WebMimeRegistry* mimeRegistry() { return 0; }
// May return null if sandbox support is not necessary
virtual WebSandboxSupport* sandboxSupport() { return 0; }
// May return null on some platforms.
virtual WebThemeEngine* themeEngine() { return 0; }
virtual WebFallbackThemeEngine* fallbackThemeEngine() { return 0; }
// May return null.
virtual WebSpeechSynthesizer* createSpeechSynthesizer(WebSpeechSynthesizerClient*) { return 0; }
// Media --------------------------------------------------------------
// May return null.
virtual WebContentDecryptionModule* createContentDecryptionModule(const WebString& keySystem) { return 0; }
// Audio --------------------------------------------------------------
virtual double audioHardwareSampleRate() { return 0; }
virtual size_t audioHardwareBufferSize() { return 0; }
virtual unsigned audioHardwareOutputChannels() { return 0; }
// Creates a device for audio I/O.
// Pass in (numberOfInputChannels > 0) if live/local audio input is desired.
virtual WebAudioDevice* createAudioDevice(size_t bufferSize, unsigned numberOfInputChannels, unsigned numberOfChannels, double sampleRate, WebAudioDevice::RenderCallback*, const WebString& deviceId) { return 0; }
// FIXME: remove deprecated APIs once chromium switches over to new method.
virtual WebAudioDevice* createAudioDevice(size_t bufferSize, unsigned numberOfChannels, double sampleRate, WebAudioDevice::RenderCallback*) { return 0; }
virtual WebAudioDevice* createAudioDevice(size_t bufferSize, unsigned numberOfInputChannels, unsigned numberOfChannels, double sampleRate, WebAudioDevice::RenderCallback*) { return 0; }
// MIDI ----------------------------------------------------------------
// Creates a platform dependent WebMIDIAccessor. MIDIAccessor under platform
// creates and owns it.
virtual WebMIDIAccessor* createMIDIAccessor(WebMIDIAccessorClient*) { return 0; }
// Blob ----------------------------------------------------------------
// Must return non-null.
virtual WebBlobRegistry* blobRegistry() { return 0; }
// Database ------------------------------------------------------------
// Opens a database file; dirHandle should be 0 if the caller does not need
// a handle to the directory containing this file
virtual FileHandle databaseOpenFile(const WebString& vfsFileName, int desiredFlags) { return FileHandle(); }
// Deletes a database file and returns the error code
virtual int databaseDeleteFile(const WebString& vfsFileName, bool syncDir) { return 0; }
// Returns the attributes of the given database file
virtual long databaseGetFileAttributes(const WebString& vfsFileName) { return 0; }
// Returns the size of the given database file
virtual long long databaseGetFileSize(const WebString& vfsFileName) { return 0; }
// Returns the space available for the given origin
virtual long long databaseGetSpaceAvailableForOrigin(const WebKit::WebString& originIdentifier) { return 0; }
// DOM Storage --------------------------------------------------
// Return a LocalStorage namespace
virtual WebStorageNamespace* createLocalStorageNamespace() { return 0; }
// FileSystem ----------------------------------------------------------
// Must return non-null.
virtual WebFileSystem* fileSystem() { return 0; }
// IDN conversion ------------------------------------------------------
virtual WebString convertIDNToUnicode(const WebString& host, const WebString& languages) { return host; }
// IndexedDB ----------------------------------------------------------
// Must return non-null.
virtual WebIDBFactory* idbFactory() { return 0; }
// Gamepad -------------------------------------------------------------
virtual void sampleGamepads(WebGamepads& into) { into.length = 0; }
// History -------------------------------------------------------------
// Returns the hash for the given canonicalized URL for use in visited
// link coloring.
virtual unsigned long long visitedLinkHash(
const char* canonicalURL, size_t length) { return 0; }
// Returns whether the given link hash is in the user's history. The
// hash must have been generated by calling VisitedLinkHash().
virtual bool isLinkVisited(unsigned long long linkHash) { return false; }
// Keygen --------------------------------------------------------------
// Handle the <keygen> tag for generating client certificates
// Returns a base64 encoded signed copy of a public key from a newly
// generated key pair and the supplied challenge string. keySizeindex
// specifies the strength of the key.
virtual WebString signedPublicKeyAndChallengeString(unsigned keySizeIndex,
const WebString& challenge,
const WebURL& url) { return WebString(); }
// Memory --------------------------------------------------------------
// Returns the current space allocated for the pagefile, in MB.
// That is committed size for Windows and virtual memory size for POSIX
virtual size_t memoryUsageMB() { return 0; }
// Same as above, but always returns actual value, without any caches.
virtual size_t actualMemoryUsageMB() { return 0; }
// Returns private and shared usage, in bytes. Private bytes is the amount of
// memory currently allocated to this process that cannot be shared. Returns
// false on platform specific error conditions.
virtual bool processMemorySizesInBytes(size_t* privateBytes, size_t* sharedBytes) { return false; }
// A callback interface for requestProcessMemorySizes
class ProcessMemorySizesCallback {
virtual ~ProcessMemorySizesCallback() { }
virtual void dataReceived(size_t privateBytes, size_t sharedBytes) = 0;
// Requests private and shared usage, in bytes. Private bytes is the amount of
// memory currently allocated to this process that cannot be shared.
// The callback ownership is passed to the callee.
virtual void requestProcessMemorySizes(ProcessMemorySizesCallback* requestCallback) { }
// Reports number of bytes used by memory allocator for internal needs.
// Returns true if the size has been reported, or false otherwise.
virtual bool memoryAllocatorWasteInBytes(size_t*) { return false; }
// Allocates discardable memory. May return 0, even if the platform supports
// discardable memory. If nonzero, however, then the WebDiscardableMmeory is
// returned in an locked state. You may use its underlying data() member
// directly, taking care to unlock it when you are ready to let it become
// discardable.
virtual WebDiscardableMemory* allocateAndLockDiscardableMemory(size_t bytes) { return 0; }
// A wrapper for tcmalloc's HeapProfilerStart();
virtual void startHeapProfiling(const WebString& /*prefix*/) { }
// A wrapper for tcmalloc's HeapProfilerStop();
virtual void stopHeapProfiling() { }
// A wrapper for tcmalloc's HeapProfilerDump()
virtual void dumpHeapProfiling(const WebString& /*reason*/) { }
// A wrapper for tcmalloc's GetHeapProfile()
virtual WebString getHeapProfile() { return WebString(); }
static const size_t noDecodedImageByteLimit = static_cast<size_t>(-1);
// Returns the maximum amount of memory a decoded image should be allowed.
// See comments on ImageDecoder::m_maxDecodedBytes.
virtual size_t maxDecodedImageBytes() { return noDecodedImageByteLimit; }
// Message Ports -------------------------------------------------------
// Creates a Message Port Channel. This can be called on any thread.
// The returned object should only be used on the thread it was created on.
virtual WebMessagePortChannel* createMessagePortChannel() { return 0; }
// Network -------------------------------------------------------------
// Returns a new WebURLLoader instance.
virtual WebURLLoader* createURLLoader() { return 0; }
// May return null.
virtual WebPrescientNetworking* prescientNetworking() { return 0; }
// Returns a new WebSocketStreamHandle instance.
virtual WebSocketStreamHandle* createSocketStreamHandle() { return 0; }
// Returns a new WebSocketHandle instance.
virtual WebSocketHandle* createWebSocketHandle() { return 0; }
// Returns the User-Agent string that should be used for the given URL.
virtual WebString userAgent(const WebURL&) { return WebString(); }
// A suggestion to cache this metadata in association with this URL.
virtual void cacheMetadata(const WebURL&, double responseTime, const char* data, size_t dataSize) { }
// Returns the decoded data url if url had a supported mimetype and parsing was successful.
virtual WebData parseDataURL(const WebURL&, WebString& mimetype, WebString& charset) { return WebData(); }
virtual WebURLError cancelledError(const WebURL&) const { return WebURLError(); }
// Plugins -------------------------------------------------------------
// If refresh is true, then cached information should not be used to
// satisfy this call.
virtual void getPluginList(bool refresh, WebPluginListBuilder*) { }
// Resources -----------------------------------------------------------
// Returns a localized string resource (with substitution parameters).
virtual WebString queryLocalizedString(WebLocalizedString::Name) { return WebString(); }
virtual WebString queryLocalizedString(WebLocalizedString::Name, const WebString& parameter) { return WebString(); }
virtual WebString queryLocalizedString(WebLocalizedString::Name, const WebString& parameter1, const WebString& parameter2) { return WebString(); }
// Threads -------------------------------------------------------
// Creates an embedder-defined thread.
virtual WebThread* createThread(const char* name) { return 0; }
// Returns an interface to the current thread. This is owned by the
// embedder.
virtual WebThread* currentThread() { return 0; }
// Profiling -----------------------------------------------------------
virtual void decrementStatsCounter(const char* name) { }
virtual void incrementStatsCounter(const char* name) { }
// Resources -----------------------------------------------------------
// Returns a blob of data corresponding to the named resource.
virtual WebData loadResource(const char* name) { return WebData(); }
// Decodes the in-memory audio file data and returns the linear PCM audio data in the destinationBus.
// A sample-rate conversion to sampleRate will occur if the file data is at a different sample-rate.
// Returns true on success.
virtual bool loadAudioResource(WebAudioBus* destinationBus, const char* audioFileData, size_t dataSize, double sampleRate) { return false; }
// Screen -------------------------------------------------------------
// Supplies the system monitor color profile.
virtual void screenColorProfile(WebVector<char>* profile) { }
// Sudden Termination --------------------------------------------------
// Disable/Enable sudden termination.
virtual void suddenTerminationChanged(bool enabled) { }
// System --------------------------------------------------------------
// Returns a value such as "en-US".
virtual WebString defaultLocale() { return WebString(); }
// Wall clock time in seconds since the epoch.
virtual double currentTime() { return 0; }
// Monotonically increasing time in seconds from an arbitrary fixed point in the past.
// This function is expected to return at least millisecond-precision values. For this reason,
// it is recommended that the fixed point be no further in the past than the epoch.
virtual double monotonicallyIncreasingTime() { return 0; }
// WebKit clients must implement this funcion if they use cryptographic randomness.
virtual void cryptographicallyRandomValues(unsigned char* buffer, size_t length) = 0;
// Delayed work is driven by a shared timer.
typedef void (*SharedTimerFunction)();
virtual void setSharedTimerFiredFunction(SharedTimerFunction timerFunction) { }
virtual void setSharedTimerFireInterval(double) { }
virtual void stopSharedTimer() { }
// Callable from a background WebKit thread.
virtual void callOnMainThread(void (*func)(void*), void* context) { }
// Vibration -----------------------------------------------------------
// Starts a vibration for the given duration in milliseconds. If there is currently an active
// vibration it will be cancelled before the new one is started.
virtual void vibrate(unsigned time) { }
// Cancels the current vibration, if there is one.
virtual void cancelVibration() { }
// Testing -------------------------------------------------------------
// Get a pointer to testing support interfaces. Will not be available in production builds.
virtual WebUnitTestSupport* unitTestSupport() { return 0; }
// Tracing -------------------------------------------------------------
// Get a pointer to the enabled state of the given trace category. The
// embedder can dynamically change the enabled state as trace event
// recording is started and stopped by the application. Only long-lived
// literal strings should be given as the category name. The implementation
// expects the returned pointer to be held permanently in a local static. If
// the unsigned char is non-zero, tracing is enabled. If tracing is enabled,
// addTraceEvent is expected to be called by the trace event macros.
virtual const unsigned char* getTraceCategoryEnabledFlag(const char* categoryName) { return 0; }
typedef long int TraceEventAPIAtomicWord;
// Get a pointer to a global state of the given thread. An embedder is
// expected to update the global state as the state of the embedder changes.
// A sampling thread in the Chromium side reads the global state periodically
// and reflects the sampling profiled results into about:tracing.
virtual TraceEventAPIAtomicWord* getTraceSamplingState(const unsigned bucketName) { return 0; }
typedef uint64_t TraceEventHandle;
// Add a trace event to the platform tracing system. Depending on the actual
// enabled state, this event may be recorded or dropped.
// - phase specifies the type of event:
// - BEGIN ('B'): Marks the beginning of a scoped event.
// - END ('E'): Marks the end of a scoped event.
// - COMPLETE ('X'): Marks the beginning of a scoped event, but doesn't
// need a matching END event. Instead, at the end of the scope,
// updateTraceEventDuration() must be called with the TraceEventHandle
// returned from addTraceEvent().
// - INSTANT ('I'): Standalone, instantaneous event.
// - START ('S'): Marks the beginning of an asynchronous event (the end
// event can occur in a different scope or thread). The id parameter is
// used to match START/FINISH pairs.
// - FINISH ('F'): Marks the end of an asynchronous event.
// - COUNTER ('C'): Used to trace integer quantities that change over
// time. The argument values are expected to be of type int.
// - METADATA ('M'): Reserved for internal use.
// - categoryEnabled is the pointer returned by getTraceCategoryEnabledFlag.
// - name is the name of the event. Also used to match BEGIN/END and
// START/FINISH pairs.
// - id optionally allows events of the same name to be distinguished from
// each other. For example, to trace the consutruction and destruction of
// objects, specify the pointer as the id parameter.
// - numArgs specifies the number of elements in argNames, argTypes, and
// argValues.
// - argNames is the array of argument names. Use long-lived literal strings
// or specify the COPY flag.
// - argTypes is the array of argument types:
// - BOOL (1): bool
// - UINT (2): unsigned long long
// - INT (3): long long
// - DOUBLE (4): double
// - POINTER (5): void*
// - STRING (6): char* (long-lived null-terminated char* string)
// - COPY_STRING (7): char* (temporary null-terminated char* string)
// - argValues is the array of argument values. Each value is the unsigned
// long long member of a union of all supported types.
// - thresholdBeginId optionally specifies the value returned by a previous
// call to addTraceEvent with a BEGIN phase.
// - threshold is used on an END phase event in conjunction with the
// thresholdBeginId of a prior BEGIN event. The threshold is the minimum
// number of microseconds that must have passed since the BEGIN event. If
// less than threshold microseconds has passed, the BEGIN/END pair is
// dropped.
// - flags can be 0 or one or more of the following, ORed together:
// - COPY (0x1): treat all strings (name, argNames and argValues of type
// string) as temporary so that they will be copied by addTraceEvent.
// - HAS_ID (0x2): use the id argument to uniquely identify the event for
// matching with other events of the same name.
// - MANGLE_ID (0x4): specify this flag if the id parameter is the value
// of a pointer.
virtual TraceEventHandle addTraceEvent(
char phase,
const unsigned char* categoryEnabledFlag,
const char* name,
unsigned long long id,
int numArgs,
const char** argNames,
const unsigned char* argTypes,
const unsigned long long* argValues,
unsigned char flags)
return 0;
// Set the duration field of a COMPLETE trace event.
virtual void updateTraceEventDuration(TraceEventHandle) { }
// Callbacks for reporting histogram data.
// CustomCounts histogram has exponential bucket sizes, so that min=1, max=1000000, bucketCount=50 would do.
virtual void histogramCustomCounts(const char* name, int sample, int min, int max, int bucketCount) { }
// Enumeration histogram buckets are linear, boundaryValue should be larger than any possible sample value.
virtual void histogramEnumeration(const char* name, int sample, int boundaryValue) { }
// Unlike enumeration histograms, sparse histograms only allocate memory for non-empty buckets.
virtual void histogramSparse(const char* name, int sample) { }
// GPU ----------------------------------------------------------------
// May return null if GPU is not supported.
// Returns newly allocated and initialized offscreen WebGraphicsContext3D instance.
virtual WebGraphicsContext3D* createOffscreenGraphicsContext3D(const WebGraphicsContext3D::Attributes&) { return 0; }
// Returns a newly allocated and initialized offscreen context provider. The provider may return a null
// graphics context if GPU is not supported.
virtual WebGraphicsContext3DProvider* createSharedOffscreenGraphicsContext3DProvider() { return 0; }
// Returns true if the platform is capable of producing an offscreen context suitable for accelerating 2d canvas.
// This will return false if the platform cannot promise that contexts will be preserved across operations like
// locking the screen or if the platform cannot provide a context with suitable performance characteristics.
// This value must be checked again after a context loss event as the platform's capabilities may have changed.
virtual bool canAccelerate2dCanvas() { return false; }
virtual bool isThreadedCompositingEnabled() { return false; }
virtual WebCompositorSupport* compositorSupport() { return 0; }
virtual WebFlingAnimator* createFlingAnimator() { return 0; }
// Creates a new fling animation curve instance for device |deviceSource|
// with |velocity| and already scrolled |cumulativeScroll| pixels.
virtual WebGestureCurve* createFlingAnimationCurve(int deviceSource, const WebFloatPoint& velocity, const WebSize& cumulativeScroll) { return 0; }
// WebRTC ----------------------------------------------------------
// Creates an WebRTCPeerConnectionHandler for RTCPeerConnection.
// May return null if WebRTC functionality is not avaliable or out of resources.
virtual WebRTCPeerConnectionHandler* createRTCPeerConnectionHandler(WebRTCPeerConnectionHandlerClient*) { return 0; }
// May return null if WebRTC functionality is not avaliable or out of resources.
virtual WebMediaStreamCenter* createMediaStreamCenter(WebMediaStreamCenterClient*) { return 0; }
// WebWorker ----------------------------------------------------------
virtual void didStartWorkerRunLoop(const WebWorkerRunLoop&) { }
virtual void didStopWorkerRunLoop(const WebWorkerRunLoop&) { }
// WebCrypto ----------------------------------------------------------
virtual WebCrypto* crypto() { return 0; }
// Device Motion / Orientation ----------------------------------------
// Sets a Listener to listen for device motion data updates.
// If null, the platform stops providing device motion data to the current listener.
virtual void setDeviceMotionListener(WebKit::WebDeviceMotionListener*) { }
// Sets a Listener to listen for device orientation data updates.
// If null, the platform stops proving device orientation data to the current listener.
virtual void setDeviceOrientationListener(WebKit::WebDeviceOrientationListener*) { }
// Quota -----------------------------------------------------------
// Queries the storage partition's storage usage and quota information.
// WebStorageQuotaCallbacks::didQueryStorageUsageAndQuota will be called
// with the current usage and quota information for the partition. When
// an error occurs WebStorageQuotaCallbacks::didFail is called with an
// error code.
// The callbacks object is deleted when the callback method is called
// and does not need to be (and should not be) deleted manually.
virtual void queryStorageUsageAndQuota(
const WebURL& storagePartition,
WebStorageQuotaCallbacks*) { }
virtual ~Platform() { }
} // namespace WebKit