The Tor Browser: gfx/skia/trunk/src/core/SkScalerContext.h@129ffea94266 (annotated)

gfx/skia/trunk/src/core/SkScalerContext.h@129ffea94266 (annotated)

gfx/skia/trunk/src/core/SkScalerContext.h

Sat, 03 Jan 2015 20:18:00 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Sat, 03 Jan 2015 20:18:00 +0100
branch: TOR_BUG_3246
changeset 7: 129ffea94266
permissions: -rw-r--r--

Conditionally enable double key logic according to:
private browsing mode or privacy.thirdparty.isolate preference and
implement in GetCookieStringCommon and FindCookie where it counts...
With some reservations of how to convince FindCookie users to test
condition and pass a nullptr when disabling double key logic.

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #ifndef SkScalerContext_DEFINED
 #define SkScalerContext_DEFINED
 #include "SkMask.h"
 #include "SkMaskGamma.h"
 #include "SkMatrix.h"
 #include "SkPaint.h"
 #include "SkTypeface.h"
 #ifdef SK_BUILD_FOR_ANDROID
     #include "SkPaintOptionsAndroid.h"
 #endif
 struct SkGlyph;
 class SkDescriptor;
 class SkMaskFilter;
 class SkPathEffect;
 class SkRasterizer;
 /*
  *  To allow this to be forward-declared, it must be its own typename, rather
  *  than a nested struct inside SkScalerContext (where it started).
  */
 struct SkScalerContextRec {
     uint32_t    fOrigFontID;
     uint32_t    fFontID;
     SkScalar    fTextSize, fPreScaleX, fPreSkewX;
     SkScalar    fPost2x2[2][2];
     SkScalar    fFrameWidth, fMiterLimit;
     //These describe the parameters to create (uniquely identify) the pre-blend.
     uint32_t    fLumBits;
     uint8_t     fDeviceGamma; //2.6, (0.0, 4.0) gamma, 0.0 for sRGB
     uint8_t     fPaintGamma;  //2.6, (0.0, 4.0) gamma, 0.0 for sRGB
     uint8_t     fContrast;    //0.8+1, [0.0, 1.0] artificial contrast
     uint8_t     fReservedAlign;
     SkScalar getDeviceGamma() const {
         return SkIntToScalar(fDeviceGamma) / (1 << 6);
     }
     void setDeviceGamma(SkScalar dg) {
         SkASSERT(0 <= dg && dg < SkIntToScalar(4));
         fDeviceGamma = SkScalarFloorToInt(dg * (1 << 6));
     }
     SkScalar getPaintGamma() const {
         return SkIntToScalar(fPaintGamma) / (1 << 6);
     }
     void setPaintGamma(SkScalar pg) {
         SkASSERT(0 <= pg && pg < SkIntToScalar(4));
         fPaintGamma = SkScalarFloorToInt(pg * (1 << 6));
     }
     SkScalar getContrast() const {
         return SkIntToScalar(fContrast) / ((1 << 8) - 1);
     }
     void setContrast(SkScalar c) {
         SkASSERT(0 <= c && c <= SK_Scalar1);
         fContrast = SkScalarRoundToInt(c * ((1 << 8) - 1));
     }
     /**
      *  Causes the luminance color and contrast to be ignored, and the
      *  paint and device gamma to be effectively 1.0.
      */
     void ignorePreBlend() {
         setLuminanceColor(SK_ColorTRANSPARENT);
         setPaintGamma(SK_Scalar1);
         setDeviceGamma(SK_Scalar1);
         setContrast(0);
     }
     uint8_t     fMaskFormat;
     uint8_t     fStrokeJoin;
     uint16_t    fFlags;
     // Warning: when adding members note that the size of this structure
     // must be a multiple of 4. SkDescriptor requires that its arguments be
     // multiples of four and this structure is put in an SkDescriptor in
     // SkPaint::MakeRec.
     void    getMatrixFrom2x2(SkMatrix*) const;
     void    getLocalMatrix(SkMatrix*) const;
     void    getSingleMatrix(SkMatrix*) const;
     inline SkPaint::Hinting getHinting() const;
     inline void setHinting(SkPaint::Hinting);
     SkMask::Format getFormat() const {
         return static_cast<SkMask::Format>(fMaskFormat);
     }
     SkColor getLuminanceColor() const {
         return fLumBits;
     }
     void setLuminanceColor(SkColor c) {
         fLumBits = c;
     }
 };
 //The following typedef hides from the rest of the implementation the number of
 //most significant bits to consider when creating mask gamma tables. Two bits
 //per channel was chosen as a balance between fidelity (more bits) and cache
 //sizes (fewer bits). Three bits per channel was chosen when #303942; (used by
 //the Chrome UI) turned out too green.
 typedef SkTMaskGamma<3, 3, 3> SkMaskGamma;
 class SkScalerContext {
 public:
     typedef SkScalerContextRec Rec;
     enum Flags {
         kFrameAndFill_Flag        = 0x0001,
         kDevKernText_Flag         = 0x0002,
         kEmbeddedBitmapText_Flag  = 0x0004,
         kEmbolden_Flag            = 0x0008,
         kSubpixelPositioning_Flag = 0x0010,
         kForceAutohinting_Flag    = 0x0020,  // Use auto instead of bytcode hinting if hinting.
         kVertical_Flag            = 0x0040,
         // together, these two flags resulting in a two bit value which matches
         // up with the SkPaint::Hinting enum.
         kHinting_Shift            = 7, // to shift into the other flags above
         kHintingBit1_Flag         = 0x0080,
         kHintingBit2_Flag         = 0x0100,
         // Pixel geometry information.
         // only meaningful if fMaskFormat is LCD16 or LCD32
         kLCD_Vertical_Flag        = 0x0200,    // else Horizontal
         kLCD_BGROrder_Flag        = 0x0400,    // else RGB order
         // Generate A8 from LCD source (for GDI and CoreGraphics).
         // only meaningful if fMaskFormat is kA8
         kGenA8FromLCD_Flag        = 0x0800, // could be 0x200 (bit meaning dependent on fMaskFormat)
     };
     // computed values
     enum {
         kHinting_Mask   = kHintingBit1_Flag | kHintingBit2_Flag,
     };
     SkScalerContext(SkTypeface*, const SkDescriptor*);
     virtual ~SkScalerContext();
     SkTypeface* getTypeface() const { return fTypeface.get(); }
     SkMask::Format getMaskFormat() const {
         return (SkMask::Format)fRec.fMaskFormat;
     }
     bool isSubpixel() const {
         return SkToBool(fRec.fFlags & kSubpixelPositioning_Flag);
     }
     // remember our glyph offset/base
     void setBaseGlyphCount(unsigned baseGlyphCount) {
         fBaseGlyphCount = baseGlyphCount;
     }
     /** Return the corresponding glyph for the specified unichar. Since contexts
         may be chained (under the hood), the glyphID that is returned may in
         fact correspond to a different font/context. In that case, we use the
         base-glyph-count to know how to translate back into local glyph space.
      */
     uint16_t charToGlyphID(SkUnichar uni);
     /** Map the glyphID to its glyph index, and then to its char code. Unmapped
         glyphs return zero.
     */
     SkUnichar glyphIDToChar(uint16_t glyphID);
     unsigned    getGlyphCount() { return this->generateGlyphCount(); }
     void        getAdvance(SkGlyph*);
     void        getMetrics(SkGlyph*);
     void        getImage(const SkGlyph&);
     void        getPath(const SkGlyph&, SkPath*);
     void        getFontMetrics(SkPaint::FontMetrics*);
 #ifdef SK_BUILD_FOR_ANDROID
     unsigned getBaseGlyphCount(SkUnichar charCode);
     // This function must be public for SkTypeface_android.h, but should not be
     // called by other callers
     SkFontID findTypefaceIdForChar(SkUnichar uni);
 #endif
     static inline void MakeRec(const SkPaint&, const SkDeviceProperties* deviceProperties,
                                const SkMatrix*, Rec* rec);
     static inline void PostMakeRec(const SkPaint&, Rec*);
     static SkMaskGamma::PreBlend GetMaskPreBlend(const Rec& rec);
 protected:
     Rec         fRec;
     unsigned    fBaseGlyphCount;
     /** Generates the contents of glyph.fAdvanceX and glyph.fAdvanceY.
      *  May call getMetrics if that would be just as fast.
      */
     virtual void generateAdvance(SkGlyph* glyph) = 0;
     /** Generates the contents of glyph.fWidth, fHeight, fTop, fLeft,
      *  as well as fAdvanceX and fAdvanceY if not already set.
      *
      *  TODO: fMaskFormat is set by getMetrics later; cannot be set here.
      */
     virtual void generateMetrics(SkGlyph* glyph) = 0;
     /** Generates the contents of glyph.fImage.
      *  When called, glyph.fImage will be pointing to a pre-allocated,
      *  uninitialized region of memory of size glyph.computeImageSize().
      *  This method may change glyph.fMaskFormat if the new image size is
      *  less than or equal to the old image size.
      *
      *  Because glyph.computeImageSize() will determine the size of fImage,
      *  generateMetrics will be called before generateImage.
      */
     virtual void generateImage(const SkGlyph& glyph) = 0;
     /** Sets the passed path to the glyph outline.
      *  If this cannot be done the path is set to empty;
      *  this is indistinguishable from a glyph with an empty path.
      *  This does not set glyph.fPath.
      *
      *  TODO: path is always glyph.fPath, no reason to pass separately.
      */
     virtual void generatePath(const SkGlyph& glyph, SkPath* path) = 0;
     /** Retrieves font metrics.
      *  TODO: there is now a vertical bit, no need for two parameters.
      */
     virtual void generateFontMetrics(SkPaint::FontMetrics* mX,
                                      SkPaint::FontMetrics* mY) = 0;
     /** Returns the number of glyphs in the font. */
     virtual unsigned generateGlyphCount() = 0;
     /** Returns the glyph id for the given unichar.
      *  If there is no 1:1 mapping from the unichar to a glyph id, returns 0.
      */
     virtual uint16_t generateCharToGlyph(SkUnichar unichar) = 0;
     /** Returns the unichar for the given glyph id.
      *  If there is no 1:1 mapping from the glyph id to a unichar, returns 0.
      *  The default implementation always returns 0, indicating failure.
      */
     virtual SkUnichar generateGlyphToChar(uint16_t glyphId);
     void forceGenerateImageFromPath() { fGenerateImageFromPath = true; }
 private:
     // never null
     SkAutoTUnref<SkTypeface> fTypeface;
 #ifdef SK_BUILD_FOR_ANDROID
     SkPaintOptionsAndroid fPaintOptionsAndroid;
 #endif
     // optional object, which may be null
     SkPathEffect*   fPathEffect;
     SkMaskFilter*   fMaskFilter;
     SkRasterizer*   fRasterizer;
     // if this is set, we draw the image from a path, rather than
     // calling generateImage.
     bool fGenerateImageFromPath;
     void internalGetPath(const SkGlyph& glyph, SkPath* fillPath,
                          SkPath* devPath, SkMatrix* fillToDevMatrix);
     // Return the context associated with the next logical typeface, or NULL if
     // there are no more entries in the fallback chain.
     SkScalerContext* allocNextContext() const;
     // return the next context, treating fNextContext as a cache of the answer
     SkScalerContext* getNextContext();
     // returns the right context from our link-list for this glyph. If no match
     // is found, just returns the original context (this)
     SkScalerContext* getGlyphContext(const SkGlyph& glyph);
     // returns the right context from our link-list for this char. If no match
     // is found it returns NULL. If a match is found then the glyphID param is
     // set to the glyphID that maps to the provided char.
     SkScalerContext* getContextFromChar(SkUnichar uni, uint16_t* glyphID);
     // link-list of context, to handle missing chars. null-terminated.
     SkScalerContext* fNextContext;
     // SkMaskGamma::PreBlend converts linear masks to gamma correcting masks.
 protected:
     // Visible to subclasses so that generateImage can apply the pre-blend directly.
     const SkMaskGamma::PreBlend fPreBlend;
 private:
     // When there is a filter, previous steps must create a linear mask
     // and the pre-blend applied as a final step.
     const SkMaskGamma::PreBlend fPreBlendForFilter;
 };
 #define kRec_SkDescriptorTag            SkSetFourByteTag('s', 'r', 'e', 'c')
 #define kPathEffect_SkDescriptorTag     SkSetFourByteTag('p', 't', 'h', 'e')
 #define kMaskFilter_SkDescriptorTag     SkSetFourByteTag('m', 's', 'k', 'f')
 #define kRasterizer_SkDescriptorTag     SkSetFourByteTag('r', 'a', 's', 't')
 #ifdef SK_BUILD_FOR_ANDROID
 #define kAndroidOpts_SkDescriptorTag    SkSetFourByteTag('a', 'n', 'd', 'r')
 #endif
 ///////////////////////////////////////////////////////////////////////////////
 enum SkAxisAlignment {
     kNone_SkAxisAlignment,
     kX_SkAxisAlignment,
     kY_SkAxisAlignment
 };
 /**
  *  Return the axis (if any) that the baseline for horizontal text will land on
  *  after running through the specified matrix.
  *
  *  As an example, the identity matrix will return kX_SkAxisAlignment
  */
 SkAxisAlignment SkComputeAxisAlignmentForHText(const SkMatrix& matrix);
 ///////////////////////////////////////////////////////////////////////////////
 SkPaint::Hinting SkScalerContextRec::getHinting() const {
     unsigned hint = (fFlags & SkScalerContext::kHinting_Mask) >>
                                             SkScalerContext::kHinting_Shift;
     return static_cast<SkPaint::Hinting>(hint);
 }
 void SkScalerContextRec::setHinting(SkPaint::Hinting hinting) {
     fFlags = (fFlags & ~SkScalerContext::kHinting_Mask) |
                                 (hinting << SkScalerContext::kHinting_Shift);
 }
 #endif

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gfx/skia/trunk/src/core/SkScalerContext.h@129ffea94266 (annotated)

gfx/skia/trunk/src/core/SkScalerContext.h