Add skia to the repository.

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@16 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 215 insertions, 0 deletions

diff --git a/skia/include/SkScalerContext.h b/skia/include/SkScalerContext.h
new file mode 100644
index 0000000..0b8981f
--- /dev/null
+++ b/skia/include/SkScalerContext.h
@@ -0,0 +1,215 @@
+/* include/graphics/SkScalerContext.h
+**
+** Copyright 2006, Google Inc.
+**
+** Licensed under the Apache License, Version 2.0 (the "License"); 
+** you may not use this file except in compliance with the License. 
+** You may obtain a copy of the License at 
+**
+**     http://www.apache.org/licenses/LICENSE-2.0 
+**
+** Unless required by applicable law or agreed to in writing, software 
+** distributed under the License is distributed on an "AS IS" BASIS, 
+** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
+** See the License for the specific language governing permissions and 
+** limitations under the License.
+*/
+
+#ifndef SkScalerContext_DEFINED
+#define SkScalerContext_DEFINED
+
+#include "SkMask.h"
+#include "SkMatrix.h"
+#include "SkPaint.h"
+#include "SkPath.h"
+#include "SkPoint.h"
+
+class SkDescriptor;
+class SkMaskFilter;
+class SkPathEffect;
+class SkRasterizer;
+
+// needs to be != to any valid SkMask::Format
+#define MASK_FORMAT_JUST_ADVANCE    (0xFF)
+
+struct SkGlyph {
+    void*       fImage;
+    SkPath*     fPath;
+    SkFixed     fAdvanceX, fAdvanceY;
+
+    uint32_t    fID;
+    uint16_t    fWidth, fHeight;
+    int16_t     fTop, fLeft;
+
+    uint8_t     fMaskFormat;
+    int8_t      fRsbDelta, fLsbDelta;  // used by auto-kerning
+    
+    unsigned rowBytes() const {
+        unsigned rb = fWidth;
+        if (SkMask::kBW_Format == fMaskFormat) {
+            rb = (rb + 7) >> 3;
+        } else {
+            rb = SkAlign4(rb);
+        }
+        return rb;
+    }
+    
+    bool isJustAdvance() const {
+        return MASK_FORMAT_JUST_ADVANCE == fMaskFormat;
+    }
+    
+    bool isFullMetrics() const {
+        return MASK_FORMAT_JUST_ADVANCE != fMaskFormat;
+    }
+    
+    uint16_t getGlyphID() const {
+        return ID2Code(fID);
+    }
+
+    unsigned getGlyphID(unsigned baseGlyphCount) const {
+        unsigned code = ID2Code(fID);
+        SkASSERT(code >= baseGlyphCount);
+        return code - baseGlyphCount;
+    }
+    
+    unsigned getSubX() const {
+        return ID2SubX(fID);
+    }
+    
+    SkFixed getSubXFixed() const {
+        return SubToFixed(ID2SubX(fID));
+    }
+    
+    SkFixed getSubYFixed() const {
+        return SubToFixed(ID2SubY(fID));
+    }
+    
+    size_t computeImageSize() const;
+    
+    enum {
+        kSubBits = 2,
+        kSubMask = ((1 << kSubBits) - 1),
+        kSubShift = 24, // must be large enough for glyphs and unichars
+        kCodeMask = ((1 << kSubShift) - 1)
+    };
+
+    static unsigned ID2Code(uint32_t id) {
+        return id & kCodeMask;
+    }
+    
+    static unsigned ID2SubX(uint32_t id) {
+        return id >> (kSubShift + kSubBits);
+    }
+    
+    static unsigned ID2SubY(uint32_t id) {
+        return (id >> kSubShift) & kSubMask;
+    }
+    
+    static unsigned FixedToSub(SkFixed n) {
+        return (n >> (16 - kSubBits)) & kSubMask;
+    }
+    
+    static SkFixed SubToFixed(unsigned sub) {
+        SkASSERT(sub <= kSubMask);
+        return sub << (16 - kSubBits);
+    }
+    
+    static uint32_t MakeID(unsigned code) {
+        return code;
+    }
+    
+    static uint32_t MakeID(unsigned code, SkFixed x, SkFixed y) {
+        SkASSERT(code <= kCodeMask);
+        x = FixedToSub(x);
+        y = FixedToSub(y);
+        return (x << (kSubShift + kSubBits)) | (y << kSubShift) | code;
+    }
+    
+    void toMask(SkMask* mask) const;
+};
+
+class SkScalerContext {
+public:
+    enum Hints {
+        kNo_Hints,
+        kSubpixel_Hints,
+        kNormal_Hints
+    };
+    enum Flags {
+        kFrameAndFill_Flag  = 0x01,
+        kDevKernText_Flag   = 0x02,
+        kGammaForBlack_Flag = 0x04, // illegal to set both Gamma flags
+        kGammaForWhite_Flag = 0x08  // illegal to set both Gamma flags
+    };
+    struct Rec {
+        uint32_t    fFontID;
+        SkScalar    fTextSize, fPreScaleX, fPreSkewX;
+        SkScalar    fPost2x2[2][2];
+        SkScalar    fFrameWidth, fMiterLimit;
+        uint8_t     fHints;
+        uint8_t     fMaskFormat;
+        uint8_t     fStrokeJoin;
+        uint8_t     fFlags;
+        
+        void    getMatrixFrom2x2(SkMatrix*) const;
+        void    getLocalMatrix(SkMatrix*) const;
+        void    getSingleMatrix(SkMatrix*) const;
+    };
+
+    SkScalerContext(const SkDescriptor* desc);
+    virtual ~SkScalerContext();
+
+    void setBaseGlyphCount(unsigned baseGlyphCount) {
+        fBaseGlyphCount = baseGlyphCount;
+    }
+
+    uint16_t    charToGlyphID(SkUnichar uni);
+
+    unsigned    getGlyphCount() const { return this->generateGlyphCount(); }
+    void        getAdvance(SkGlyph*);
+    void        getMetrics(SkGlyph*);
+    void        getImage(const SkGlyph&);
+    void        getPath(const SkGlyph&, SkPath*);
+    void        getFontMetrics(SkPaint::FontMetrics* mX,
+                               SkPaint::FontMetrics* mY);
+
+    static inline void MakeRec(const SkPaint&, const SkMatrix*, Rec* rec);
+    static SkScalerContext* Create(const SkDescriptor*);
+
+protected:
+    Rec         fRec;
+    unsigned    fBaseGlyphCount;
+
+    virtual unsigned generateGlyphCount() const = 0;
+    virtual uint16_t generateCharToGlyph(SkUnichar) = 0;
+    virtual void generateAdvance(SkGlyph*) = 0;
+    virtual void generateMetrics(SkGlyph*) = 0;
+    virtual void generateImage(const SkGlyph&) = 0;
+    virtual void generatePath(const SkGlyph&, SkPath*) = 0;
+    virtual void generateFontMetrics(SkPaint::FontMetrics* mX,
+                                     SkPaint::FontMetrics* mY) = 0;
+
+private:
+    SkPathEffect*   fPathEffect;
+    SkMaskFilter*   fMaskFilter;
+    SkRasterizer*   fRasterizer;
+    SkScalar        fDevFrameWidth;
+
+    void internalGetPath(const SkGlyph& glyph, SkPath* fillPath,
+                         SkPath* devPath, SkMatrix* fillToDevMatrix);
+
+    mutable SkScalerContext* fAuxScalerContext;
+
+    SkScalerContext* getGlyphContext(const SkGlyph& glyph) const;
+    
+    // return loaded fAuxScalerContext or NULL
+    SkScalerContext* loadAuxContext() const;
+};
+
+#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')
+
+#endif
+