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      1 /*
      2  * Copyright (C) 2006 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #ifndef SkDraw_DEFINED
     18 #define SkDraw_DEFINED
     19 
     20 #include "SkBitmap.h"
     21 #include "SkCanvas.h"
     22 #include "SkMask.h"
     23 #include "SkMatrix.h"
     24 #include "SkPaint.h"
     25 #include "SkRect.h"
     26 #include "SkAutoKern.h"
     27 
     28 class SkBounder;
     29 class SkDevice;
     30 class SkPath;
     31 class SkRegion;
     32 struct SkDrawProcs;
     33 
     34 class SkDraw {
     35 public:
     36     SkDraw() : fDevice(NULL), fBounder(NULL), fProcs(NULL) {}
     37     SkDraw(const SkDraw& src);
     38 
     39     void    drawPaint(const SkPaint&) const;
     40     void    drawPoints(SkCanvas::PointMode, size_t count, const SkPoint[],
     41                        const SkPaint&) const;
     42     void    drawRect(const SkRect&, const SkPaint&) const;
     43     /*  To save on mallocs, we allow a flag that tells us that srcPath is
     44         mutable, so that we don't have to make copies of it as we transform it.
     45     */
     46     void    drawPath(const SkPath& srcPath, const SkPaint&,
     47                      const SkMatrix* prePathMatrix, bool pathIsMutable) const;
     48     void    drawBitmap(const SkBitmap&, const SkMatrix&, const SkPaint&) const;
     49     void    drawSprite(const SkBitmap&, int x, int y, const SkPaint&) const;
     50     void    drawText(const char text[], size_t byteLength, SkScalar x,
     51                      SkScalar y, const SkPaint& paint) const;
     52     void    drawPosText(const char text[], size_t byteLength,
     53                         const SkScalar pos[], SkScalar constY,
     54                         int scalarsPerPosition, const SkPaint& paint) const;
     55     void    drawTextOnPath(const char text[], size_t byteLength,
     56                         const SkPath&, const SkMatrix*, const SkPaint&) const;
     57     void    drawVertices(SkCanvas::VertexMode mode, int count,
     58                          const SkPoint vertices[], const SkPoint textures[],
     59                          const SkColor colors[], SkXfermode* xmode,
     60                          const uint16_t indices[], int ptCount,
     61                          const SkPaint& paint) const;
     62 
     63     void drawPath(const SkPath& src, const SkPaint& paint) const {
     64         this->drawPath(src, paint, NULL, false);
     65     }
     66 
     67     /** Helper function that creates a mask from a path and an optional maskfilter.
     68         Note however, that the resulting mask will not have been actually filtered,
     69         that must be done afterwards (by calling filterMask). The maskfilter is provided
     70         solely to assist in computing the mask's bounds (if the mode requests that).
     71     */
     72     static bool DrawToMask(const SkPath& devPath, const SkIRect* clipBounds,
     73                            SkMaskFilter* filter, const SkMatrix* filterMatrix,
     74                            SkMask* mask, SkMask::CreateMode mode);
     75 
     76 private:
     77     void    drawText_asPaths(const char text[], size_t byteLength,
     78                              SkScalar x, SkScalar y, const SkPaint&) const;
     79     void    drawDevMask(const SkMask& mask, const SkPaint&) const;
     80     void    drawBitmapAsMask(const SkBitmap&, const SkPaint&) const;
     81 
     82 public:
     83     const SkBitmap* fBitmap;        // required
     84     const SkMatrix* fMatrix;        // required
     85     const SkRegion* fClip;          // required
     86     SkDevice*       fDevice;        // optional
     87     SkBounder*      fBounder;       // optional
     88     SkDrawProcs*    fProcs;         // optional
     89 
     90 #ifdef SK_DEBUG
     91     void    validate() const;
     92 #endif
     93 };
     94 
     95 class SkGlyphCache;
     96 
     97 class SkTextToPathIter {
     98 public:
     99     SkTextToPathIter(const char text[], size_t length, const SkPaint&,
    100                      bool applyStrokeAndPathEffects, bool forceLinearTextOn);
    101     ~SkTextToPathIter();
    102 
    103     const SkPaint&  getPaint() const { return fPaint; }
    104     SkScalar        getPathScale() const { return fScale; }
    105 
    106     const SkPath*   next(SkScalar* xpos);   //!< returns nil when there are no more paths
    107 
    108 private:
    109     SkGlyphCache*   fCache;
    110     SkPaint         fPaint;
    111     SkScalar        fScale;
    112     SkFixed         fPrevAdvance;
    113     const char*     fText;
    114     const char*     fStop;
    115     SkMeasureCacheProc fGlyphCacheProc;
    116 
    117     const SkPath*   fPath;      // returned in next
    118     SkScalar        fXPos;      // accumulated xpos, returned in next
    119     SkAutoKern      fAutoKern;
    120 };
    121 
    122 #endif
    123 
    124 
    125