gecko/gfx/thebes/gfxPlatform.h

611 lines
22 KiB
C++

/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef GFX_PLATFORM_H
#define GFX_PLATFORM_H
#include "prlog.h"
#include "nsTArray.h"
#include "nsStringGlue.h"
#include "nsIObserver.h"
#include "gfxTypes.h"
#include "gfxASurface.h"
#include "gfxColor.h"
#include "qcms.h"
#include "gfx2DGlue.h"
#include "mozilla/RefPtr.h"
#include "GfxInfoCollector.h"
#ifdef XP_OS2
#undef OS2EMX_PLAIN_CHAR
#endif
class gfxImageSurface;
class gfxFont;
class gfxFontGroup;
struct gfxFontStyle;
class gfxUserFontSet;
class gfxFontEntry;
class gfxProxyFontEntry;
class gfxPlatformFontList;
class gfxTextRun;
class nsIURI;
class nsIAtom;
extern cairo_user_data_key_t kDrawTarget;
// pref lang id's for font prefs
// !!! needs to match the list of pref font.default.xx entries listed in all.js !!!
// !!! don't use as bit mask, this may grow larger !!!
enum eFontPrefLang {
eFontPrefLang_Western = 0,
eFontPrefLang_CentEuro = 1,
eFontPrefLang_Japanese = 2,
eFontPrefLang_ChineseTW = 3,
eFontPrefLang_ChineseCN = 4,
eFontPrefLang_ChineseHK = 5,
eFontPrefLang_Korean = 6,
eFontPrefLang_Cyrillic = 7,
eFontPrefLang_Baltic = 8,
eFontPrefLang_Greek = 9,
eFontPrefLang_Turkish = 10,
eFontPrefLang_Thai = 11,
eFontPrefLang_Hebrew = 12,
eFontPrefLang_Arabic = 13,
eFontPrefLang_Devanagari = 14,
eFontPrefLang_Tamil = 15,
eFontPrefLang_Armenian = 16,
eFontPrefLang_Bengali = 17,
eFontPrefLang_Canadian = 18,
eFontPrefLang_Ethiopic = 19,
eFontPrefLang_Georgian = 20,
eFontPrefLang_Gujarati = 21,
eFontPrefLang_Gurmukhi = 22,
eFontPrefLang_Khmer = 23,
eFontPrefLang_Malayalam = 24,
eFontPrefLang_Oriya = 25,
eFontPrefLang_Telugu = 26,
eFontPrefLang_Kannada = 27,
eFontPrefLang_Sinhala = 28,
eFontPrefLang_Tibetan = 29,
eFontPrefLang_LangCount = 30, // except Others and UserDefined.
eFontPrefLang_Others = 30, // x-unicode
eFontPrefLang_UserDefined = 31,
eFontPrefLang_CJKSet = 32, // special code for CJK set
eFontPrefLang_AllCount = 33
};
enum eCMSMode {
eCMSMode_Off = 0, // No color management
eCMSMode_All = 1, // Color manage everything
eCMSMode_TaggedOnly = 2, // Color manage tagged Images Only
eCMSMode_AllCount = 3
};
enum eGfxLog {
// all font enumerations, localized names, fullname/psnames, cmap loads
eGfxLog_fontlist = 0,
// timing info on font initialization
eGfxLog_fontinit = 1,
// dump text runs, font matching, system fallback for content
eGfxLog_textrun = 2,
// dump text runs, font matching, system fallback for chrome
eGfxLog_textrunui = 3,
// dump cmap coverage data as they are loaded
eGfxLog_cmapdata = 4
};
// when searching through pref langs, max number of pref langs
const uint32_t kMaxLenPrefLangList = 32;
#define UNINITIALIZED_VALUE (-1)
typedef gfxASurface::gfxImageFormat gfxImageFormat;
inline const char*
GetBackendName(mozilla::gfx::BackendType aBackend)
{
switch (aBackend) {
case mozilla::gfx::BACKEND_DIRECT2D:
return "direct2d";
case mozilla::gfx::BACKEND_COREGRAPHICS_ACCELERATED:
return "quartz accelerated";
case mozilla::gfx::BACKEND_COREGRAPHICS:
return "quartz";
case mozilla::gfx::BACKEND_CAIRO:
return "cairo";
case mozilla::gfx::BACKEND_SKIA:
return "skia";
case mozilla::gfx::BACKEND_RECORDING:
return "recording";
case mozilla::gfx::BACKEND_NONE:
return "none";
}
MOZ_NOT_REACHED("Incomplete switch");
}
class THEBES_API gfxPlatform {
public:
/**
* Return a pointer to the current active platform.
* This is a singleton; it contains mostly convenience
* functions to obtain platform-specific objects.
*/
static gfxPlatform *GetPlatform();
/**
* Shut down Thebes.
* Init() arranges for this to be called at an appropriate time.
*/
static void Shutdown();
/**
* Create an offscreen surface of the given dimensions
* and image format.
*/
virtual already_AddRefed<gfxASurface> CreateOffscreenSurface(const gfxIntSize& size,
gfxASurface::gfxContentType contentType) = 0;
/**
* Create an offscreen surface of the given dimensions and image format which
* can be converted to a gfxImageSurface without copying. If we can provide
* a platform-hosted surface, then we will return that instead of an actual
* gfxImageSurface.
* Sub-classes should override this method if CreateOffscreenSurface returns a
* surface which implements GetAsImageSurface
*/
virtual already_AddRefed<gfxASurface>
CreateOffscreenImageSurface(const gfxIntSize& aSize,
gfxASurface::gfxContentType aContentType);
virtual already_AddRefed<gfxASurface> OptimizeImage(gfxImageSurface *aSurface,
gfxASurface::gfxImageFormat format);
virtual mozilla::RefPtr<mozilla::gfx::DrawTarget>
CreateDrawTargetForSurface(gfxASurface *aSurface, const mozilla::gfx::IntSize& aSize);
/*
* Creates a SourceSurface for a gfxASurface. This function does no caching,
* so the caller should cache the gfxASurface if it will be used frequently.
* The returned surface keeps a reference to aTarget, so it is OK to keep the
* surface, even if aTarget changes.
* aTarget should not keep a reference to the returned surface because that
* will cause a cycle.
*/
virtual mozilla::RefPtr<mozilla::gfx::SourceSurface>
GetSourceSurfaceForSurface(mozilla::gfx::DrawTarget *aTarget, gfxASurface *aSurface);
virtual mozilla::TemporaryRef<mozilla::gfx::ScaledFont>
GetScaledFontForFont(mozilla::gfx::DrawTarget* aTarget, gfxFont *aFont);
/*
* Cairo doesn't give us a way to create a surface pointing to a context
* without marking it as copy on write. For canvas we want to create
* a surface that points to what is currently being drawn by a canvas
* without a copy thus we need to create a special case. This works on
* most platforms with GetThebesSurfaceForDrawTarget but fails on Mac
* because when we create the surface we vm_copy the memory and never
* notify the context that the canvas has drawn to it thus we end up
* with a static snapshot.
*
* This function guarantes that the gfxASurface reflects the DrawTarget.
*/
virtual already_AddRefed<gfxASurface>
CreateThebesSurfaceAliasForDrawTarget_hack(mozilla::gfx::DrawTarget *aTarget) {
// Overwrite me on platform where GetThebesSurfaceForDrawTarget returns
// a snapshot of the draw target.
return GetThebesSurfaceForDrawTarget(aTarget);
}
virtual already_AddRefed<gfxASurface>
GetThebesSurfaceForDrawTarget(mozilla::gfx::DrawTarget *aTarget);
virtual mozilla::RefPtr<mozilla::gfx::DrawTarget>
CreateOffscreenDrawTarget(const mozilla::gfx::IntSize& aSize, mozilla::gfx::SurfaceFormat aFormat);
virtual mozilla::RefPtr<mozilla::gfx::DrawTarget>
CreateDrawTargetForData(unsigned char* aData, const mozilla::gfx::IntSize& aSize,
int32_t aStride, mozilla::gfx::SurfaceFormat aFormat);
bool SupportsAzureContent() {
return GetContentBackend() != mozilla::gfx::BACKEND_NONE;
}
void GetAzureBackendInfo(mozilla::widget::InfoObject &aObj) {
aObj.DefineProperty("AzureCanvasBackend", GetBackendName(mPreferredCanvasBackend));
aObj.DefineProperty("AzureFallbackCanvasBackend", GetBackendName(mFallbackCanvasBackend));
aObj.DefineProperty("AzureContentBackend", GetBackendName(mContentBackend));
}
mozilla::gfx::BackendType GetPreferredCanvasBackend() {
return mPreferredCanvasBackend;
}
/*
* Font bits
*/
virtual void SetupClusterBoundaries(gfxTextRun *aTextRun, const PRUnichar *aString);
/**
* Fill aListOfFonts with the results of querying the list of font names
* that correspond to the given language group or generic font family
* (or both, or neither).
*/
virtual nsresult GetFontList(nsIAtom *aLangGroup,
const nsACString& aGenericFamily,
nsTArray<nsString>& aListOfFonts);
/**
* Rebuilds the any cached system font lists
*/
virtual nsresult UpdateFontList();
/**
* Create the platform font-list object (gfxPlatformFontList concrete subclass).
* This function is responsible to create the appropriate subclass of
* gfxPlatformFontList *and* to call its InitFontList() method.
*/
virtual gfxPlatformFontList *CreatePlatformFontList() {
NS_NOTREACHED("oops, this platform doesn't have a gfxPlatformFontList implementation");
return nullptr;
}
/**
* Font name resolver, this returns actual font name(s) by the callback
* function. If the font doesn't exist, the callback function is not called.
* If the callback function returns false, the aAborted value is set to
* true, otherwise, false.
*/
typedef bool (*FontResolverCallback) (const nsAString& aName,
void *aClosure);
virtual nsresult ResolveFontName(const nsAString& aFontName,
FontResolverCallback aCallback,
void *aClosure,
bool& aAborted) = 0;
/**
* Resolving a font name to family name. The result MUST be in the result of GetFontList().
* If the name doesn't in the system, aFamilyName will be empty string, but not failed.
*/
virtual nsresult GetStandardFamilyName(const nsAString& aFontName, nsAString& aFamilyName) = 0;
/**
* Create the appropriate platform font group
*/
virtual gfxFontGroup *CreateFontGroup(const nsAString& aFamilies,
const gfxFontStyle *aStyle,
gfxUserFontSet *aUserFontSet) = 0;
/**
* Look up a local platform font using the full font face name.
* (Needed to support @font-face src local().)
* Ownership of the returned gfxFontEntry is passed to the caller,
* who must either AddRef() or delete.
*/
virtual gfxFontEntry* LookupLocalFont(const gfxProxyFontEntry *aProxyEntry,
const nsAString& aFontName)
{ return nullptr; }
/**
* Activate a platform font. (Needed to support @font-face src url().)
* aFontData is a NS_Malloc'ed block that must be freed by this function
* (or responsibility passed on) when it is no longer needed; the caller
* will NOT free it.
* Ownership of the returned gfxFontEntry is passed to the caller,
* who must either AddRef() or delete.
*/
virtual gfxFontEntry* MakePlatformFont(const gfxProxyFontEntry *aProxyEntry,
const uint8_t *aFontData,
uint32_t aLength);
/**
* Whether to allow downloadable fonts via @font-face rules
*/
bool DownloadableFontsEnabled();
/**
* True when hinting should be enabled. This setting shouldn't
* change per gecko process, while the process is live. If so the
* results are not defined.
*
* NB: this bit is only honored by the FT2 backend, currently.
*/
virtual bool FontHintingEnabled() { return true; }
/**
* True when zooming should not require reflow, so glyph metrics and
* positioning should not be adjusted for device pixels.
* If this is TRUE, then FontHintingEnabled() should be FALSE,
* but the converse is not necessarily required; in particular,
* B2G always has FontHintingEnabled FALSE, but RequiresLinearZoom
* is only true for the browser process, not Gaia or other apps.
*
* Like FontHintingEnabled (above), this setting shouldn't
* change per gecko process, while the process is live. If so the
* results are not defined.
*
* NB: this bit is only honored by the FT2 backend, currently.
*/
virtual bool RequiresLinearZoom() { return false; }
bool UsesSubpixelAATextRendering() {
#ifdef MOZ_GFX_OPTIMIZE_MOBILE
return false;
#endif
return true;
}
/**
* Whether to check all font cmaps during system font fallback
*/
bool UseCmapsDuringSystemFallback();
#ifdef MOZ_GRAPHITE
/**
* Whether to use the SIL Graphite rendering engine
* (for fonts that include Graphite tables)
*/
bool UseGraphiteShaping();
#endif
/**
* Whether to use the harfbuzz shaper (depending on script complexity).
*
* This allows harfbuzz to be enabled selectively via the preferences.
*/
bool UseHarfBuzzForScript(int32_t aScriptCode);
// check whether format is supported on a platform or not (if unclear, returns true)
virtual bool IsFontFormatSupported(nsIURI *aFontURI, uint32_t aFormatFlags) { return false; }
void GetPrefFonts(nsIAtom *aLanguage, nsString& array, bool aAppendUnicode = true);
// in some situations, need to make decisions about ambiguous characters, may need to look at multiple pref langs
void GetLangPrefs(eFontPrefLang aPrefLangs[], uint32_t &aLen, eFontPrefLang aCharLang, eFontPrefLang aPageLang);
/**
* Iterate over pref fonts given a list of lang groups. For a single lang
* group, multiple pref fonts are possible. If error occurs, returns false,
* true otherwise. Callback returns false to abort process.
*/
typedef bool (*PrefFontCallback) (eFontPrefLang aLang, const nsAString& aName,
void *aClosure);
static bool ForEachPrefFont(eFontPrefLang aLangArray[], uint32_t aLangArrayLen,
PrefFontCallback aCallback,
void *aClosure);
// convert a lang group to enum constant (i.e. "zh-TW" ==> eFontPrefLang_ChineseTW)
static eFontPrefLang GetFontPrefLangFor(const char* aLang);
// convert a lang group atom to enum constant
static eFontPrefLang GetFontPrefLangFor(nsIAtom *aLang);
// convert a enum constant to lang group string (i.e. eFontPrefLang_ChineseTW ==> "zh-TW")
static const char* GetPrefLangName(eFontPrefLang aLang);
// map a Unicode range (based on char code) to a font language for Preferences
static eFontPrefLang GetFontPrefLangFor(uint8_t aUnicodeRange);
// returns true if a pref lang is CJK
static bool IsLangCJK(eFontPrefLang aLang);
// helper method to add a pref lang to an array, if not already in array
static void AppendPrefLang(eFontPrefLang aPrefLangs[], uint32_t& aLen, eFontPrefLang aAddLang);
// returns a list of commonly used fonts for a given character
// these are *possible* matches, no cmap-checking is done at this level
virtual void GetCommonFallbackFonts(const uint32_t /*aCh*/,
int32_t /*aRunScript*/,
nsTArray<const char*>& /*aFontList*/)
{
// platform-specific override, by default do nothing
}
// Break large OMTC tiled thebes layer painting into small paints.
static bool UseProgressiveTilePainting();
// When a critical display-port is set, render the visible area outside of
// it into a buffer at a lower precision. Requires tiled buffers.
static bool UseLowPrecisionBuffer();
// Retrieve the resolution that a low precision buffer should render at.
static float GetLowPrecisionResolution();
// Retain some invalid tiles when the valid region of a layer changes and
// excludes previously valid tiles.
static bool UseReusableTileStore();
static bool OffMainThreadCompositingEnabled();
/**
* Are we going to try color management?
*/
static eCMSMode GetCMSMode();
/**
* Determines the rendering intent for color management.
*
* If the value in the pref gfx.color_management.rendering_intent is a
* valid rendering intent as defined in gfx/qcms/qcms.h, that
* value is returned. Otherwise, -1 is returned and the embedded intent
* should be used.
*
* See bug 444014 for details.
*/
static int GetRenderingIntent();
/**
* Convert a pixel using a cms transform in an endian-aware manner.
*
* Sets 'out' to 'in' if transform is NULL.
*/
static void TransformPixel(const gfxRGBA& in, gfxRGBA& out, qcms_transform *transform);
/**
* Return the output device ICC profile.
*/
static qcms_profile* GetCMSOutputProfile();
/**
* Return the sRGB ICC profile.
*/
static qcms_profile* GetCMSsRGBProfile();
/**
* Return sRGB -> output device transform.
*/
static qcms_transform* GetCMSRGBTransform();
/**
* Return output -> sRGB device transform.
*/
static qcms_transform* GetCMSInverseRGBTransform();
/**
* Return sRGBA -> output device transform.
*/
static qcms_transform* GetCMSRGBATransform();
virtual void FontsPrefsChanged(const char *aPref);
void OrientationSyncPrefsObserverChanged();
int32_t GetBidiNumeralOption();
/**
* Returns a 1x1 surface that can be used to create graphics contexts
* for measuring text etc as if they will be rendered to the screen
*/
gfxASurface* ScreenReferenceSurface() { return mScreenReferenceSurface; }
virtual mozilla::gfx::SurfaceFormat Optimal2DFormatForContent(gfxASurface::gfxContentType aContent);
virtual gfxImageFormat OptimalFormatForContent(gfxASurface::gfxContentType aContent);
virtual gfxImageFormat GetOffscreenFormat()
{ return gfxASurface::ImageFormatRGB24; }
/**
* Returns a logger if one is available and logging is enabled
*/
static PRLogModuleInfo* GetLog(eGfxLog aWhichLog);
bool WorkAroundDriverBugs() const { return mWorkAroundDriverBugs; }
virtual int GetScreenDepth() const;
bool WidgetUpdateFlashing() const { return mWidgetUpdateFlashing; }
uint32_t GetOrientationSyncMillis() const;
protected:
gfxPlatform();
virtual ~gfxPlatform();
void AppendCJKPrefLangs(eFontPrefLang aPrefLangs[], uint32_t &aLen,
eFontPrefLang aCharLang, eFontPrefLang aPageLang);
/**
* Helper method, creates a draw target for a specific Azure backend.
* Used by CreateOffscreenDrawTarget.
*/
mozilla::RefPtr<mozilla::gfx::DrawTarget>
CreateDrawTargetForBackend(mozilla::gfx::BackendType aBackend,
const mozilla::gfx::IntSize& aSize,
mozilla::gfx::SurfaceFormat aFormat);
/**
* Initialise the preferred and fallback canvas backends
* aBackendBitmask specifies the backends which are acceptable to the caller.
* The backend used is determined by aBackendBitmask and the order specified
* by the gfx.canvas.azure.backends pref.
*/
void InitBackendPrefs(uint32_t aCanvasBitmask, uint32_t aContentBitmask);
/**
* returns the first backend named in the pref gfx.canvas.azure.backends
* which is a component of aBackendBitmask, a bitmask of backend types
*/
static mozilla::gfx::BackendType GetCanvasBackendPref(uint32_t aBackendBitmask);
/**
* returns the first backend named in the pref gfx.content.azure.backend
* which is a component of aBackendBitmask, a bitmask of backend types
*/
static mozilla::gfx::BackendType GetContentBackendPref(uint32_t aBackendBitmask);
/**
* If aEnabledPrefName is non-null, checks the aEnabledPrefName pref and
* returns BACKEND_NONE if the pref is not enabled.
* Otherwise it will return the first backend named in aBackendPrefName
* allowed by aBackendBitmask, a bitmask of backend types.
*/
static mozilla::gfx::BackendType GetBackendPref(const char* aEnabledPrefName,
const char* aBackendPrefName,
uint32_t aBackendBitmask);
/**
* Decode the backend enumberation from a string.
*/
static mozilla::gfx::BackendType BackendTypeForName(const nsCString& aName);
mozilla::gfx::BackendType GetContentBackend() {
return mContentBackend;
}
int8_t mAllowDownloadableFonts;
#ifdef MOZ_GRAPHITE
int8_t mGraphiteShapingEnabled;
#endif
int8_t mBidiNumeralOption;
// whether to always search font cmaps globally
// when doing system font fallback
int8_t mFallbackUsesCmaps;
// which scripts should be shaped with harfbuzz
int32_t mUseHarfBuzzScripts;
private:
/**
* Start up Thebes.
*/
static void Init();
virtual qcms_profile* GetPlatformCMSOutputProfile();
nsRefPtr<gfxASurface> mScreenReferenceSurface;
nsTArray<uint32_t> mCJKPrefLangs;
nsCOMPtr<nsIObserver> mSRGBOverrideObserver;
nsCOMPtr<nsIObserver> mFontPrefsObserver;
nsCOMPtr<nsIObserver> mOrientationSyncPrefsObserver;
// The preferred draw target backend to use for canvas
mozilla::gfx::BackendType mPreferredCanvasBackend;
// The fallback draw target backend to use for canvas, if the preferred backend fails
mozilla::gfx::BackendType mFallbackCanvasBackend;
// The backend to use for content
mozilla::gfx::BackendType mContentBackend;
mozilla::widget::GfxInfoCollector<gfxPlatform> mAzureCanvasBackendCollector;
bool mWorkAroundDriverBugs;
mozilla::RefPtr<mozilla::gfx::DrawEventRecorder> mRecorder;
bool mWidgetUpdateFlashing;
uint32_t mOrientationSyncMillis;
};
#endif /* GFX_PLATFORM_H */