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1 /*
2  * Copyright 2010 The Android Open Source Project
3  *
4  * Use of this source code is governed by a BSD-style license that can be
5  * found in the LICENSE file.
6  */
7 
8 
9 #ifndef SkPDFGraphicState_DEFINED
10 #define SkPDFGraphicState_DEFINED
11 
12 #include "SkPDFTypes.h"
13 #include "SkOpts.h"
14 
15 class SkPaint;
16 class SkPDFCanon;
17 
18 /** \class SkPDFGraphicState
19     SkPaint objects roughly correspond to graphic state dictionaries that can
20     be installed. So that a given dictionary is only output to the pdf file
21     once, we want to canonicalize them.
22 */
23 class SkPDFGraphicState final : public SkPDFObject {
24 
25 public:
26     enum SkPDFSMaskMode {
27         kAlpha_SMaskMode,
28         kLuminosity_SMaskMode
29     };
30 
31     // Override emitObject so that we can populate the dictionary on
32     // demand.
33     void emitObject(SkWStream* stream,
34                     const SkPDFObjNumMap& objNumMap) const override;
35 
36     /** Get the graphic state for the passed SkPaint. The reference count of
37      *  the object is incremented and it is the caller's responsibility to
38      *  unreference it when done. This is needed to accommodate the weak
39      *  reference pattern used when the returned object is new and has no
40      *  other references.
41      *  @param paint  The SkPaint to emulate.
42      */
43     static SkPDFGraphicState* GetGraphicStateForPaint(SkPDFCanon* canon,
44                                                       const SkPaint& paint);
45 
46     /** Make a graphic state that only sets the passed soft mask.
47      *  @param sMask     The form xobject to use as a soft mask.
48      *  @param invert    Indicates if the alpha of the sMask should be inverted.
49      *  @param sMaskMode Whether to use alpha or luminosity for the sMask.
50      *
51      *  These are not de-duped.
52      */
53     static sk_sp<SkPDFDict> GetSMaskGraphicState(sk_sp<SkPDFObject> sMask,
54                                                  bool invert,
55                                                  SkPDFSMaskMode sMaskMode,
56                                                  SkPDFCanon* canon);
57 
58     /** Make a graphic state that only unsets the soft mask. */
59     static sk_sp<SkPDFDict> MakeNoSmaskGraphicState();
60     static sk_sp<SkPDFStream> MakeInvertFunction();
61 
62     bool operator==(const SkPDFGraphicState& rhs) const {
63         return 0 == memcmp(&fStrokeWidth, &rhs.fStrokeWidth, 12);
64     }
hash()65     uint32_t hash() const { return SkOpts::hash(&fStrokeWidth, 12); }
66 
67 private:
68     const SkScalar fStrokeWidth;
69     const SkScalar fStrokeMiter;
70     const uint8_t fAlpha;
71     const uint8_t fStrokeCap;   // SkPaint::Cap
72     const uint8_t fStrokeJoin;  // SkPaint::Join
73     const uint8_t fMode;        // SkBlendMode
74 
75     SkPDFGraphicState(const SkPaint&);
76 
77     typedef SkPDFDict INHERITED;
78 };
79 
80 #endif
81