1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/skia/trunk/src/pdf/SkPDFGraphicState.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,111 @@
1.4 +
1.5 +/*
1.6 + * Copyright 2010 The Android Open Source Project
1.7 + *
1.8 + * Use of this source code is governed by a BSD-style license that can be
1.9 + * found in the LICENSE file.
1.10 + */
1.11 +
1.12 +
1.13 +#ifndef SkPDFGraphicState_DEFINED
1.14 +#define SkPDFGraphicState_DEFINED
1.15 +
1.16 +#include "SkPaint.h"
1.17 +#include "SkPDFTypes.h"
1.18 +#include "SkTemplates.h"
1.19 +#include "SkThread.h"
1.20 +
1.21 +class SkPDFFormXObject;
1.22 +
1.23 +/** \class SkPDFGraphicState
1.24 + SkPaint objects roughly correspond to graphic state dictionaries that can
1.25 + be installed. So that a given dictionary is only output to the pdf file
1.26 + once, we want to canonicalize them. Static methods in this class manage
1.27 + a weakly referenced set of SkPDFGraphicState objects: when the last
1.28 + reference to a SkPDFGraphicState is removed, it removes itself from the
1.29 + static set of objects.
1.30 +
1.31 +*/
1.32 +class SkPDFGraphicState : public SkPDFDict {
1.33 + SK_DECLARE_INST_COUNT(SkPDFGraphicState)
1.34 +public:
1.35 + enum SkPDFSMaskMode {
1.36 + kAlpha_SMaskMode,
1.37 + kLuminosity_SMaskMode
1.38 + };
1.39 +
1.40 + virtual ~SkPDFGraphicState();
1.41 +
1.42 + virtual void getResources(const SkTSet<SkPDFObject*>& knownResourceObjects,
1.43 + SkTSet<SkPDFObject*>* newResourceObjects);
1.44 +
1.45 + // Override emitObject and getOutputSize so that we can populate
1.46 + // the dictionary on demand.
1.47 + virtual void emitObject(SkWStream* stream, SkPDFCatalog* catalog,
1.48 + bool indirect);
1.49 + virtual size_t getOutputSize(SkPDFCatalog* catalog, bool indirect);
1.50 +
1.51 + /** Get the graphic state for the passed SkPaint. The reference count of
1.52 + * the object is incremented and it is the caller's responsibility to
1.53 + * unreference it when done. This is needed to accommodate the weak
1.54 + * reference pattern used when the returned object is new and has no
1.55 + * other references.
1.56 + * @param paint The SkPaint to emulate.
1.57 + */
1.58 + static SkPDFGraphicState* GetGraphicStateForPaint(const SkPaint& paint);
1.59 +
1.60 + /** Make a graphic state that only sets the passed soft mask. The
1.61 + * reference count of the object is incremented and it is the caller's
1.62 + * responsibility to unreference it when done.
1.63 + * @param sMask The form xobject to use as a soft mask.
1.64 + * @param invert Indicates if the alpha of the sMask should be inverted.
1.65 + * @param sMaskMode Whether to use alpha or luminosity for the sMask.
1.66 + */
1.67 + static SkPDFGraphicState* GetSMaskGraphicState(SkPDFFormXObject* sMask,
1.68 + bool invert,
1.69 + SkPDFSMaskMode sMaskMode);
1.70 +
1.71 + /** Get a graphic state that only unsets the soft mask. The reference
1.72 + * count of the object is incremented and it is the caller's responsibility
1.73 + * to unreference it when done. This is needed to accommodate the weak
1.74 + * reference pattern used when the returned object is new and has no
1.75 + * other references.
1.76 + */
1.77 + static SkPDFGraphicState* GetNoSMaskGraphicState();
1.78 +
1.79 +private:
1.80 + const SkPaint fPaint;
1.81 + SkTDArray<SkPDFObject*> fResources;
1.82 + bool fPopulated;
1.83 + bool fSMask;
1.84 +
1.85 + class GSCanonicalEntry {
1.86 + public:
1.87 + SkPDFGraphicState* fGraphicState;
1.88 + const SkPaint* fPaint;
1.89 +
1.90 + bool operator==(const GSCanonicalEntry& b) const;
1.91 + explicit GSCanonicalEntry(SkPDFGraphicState* gs)
1.92 + : fGraphicState(gs),
1.93 + fPaint(&gs->fPaint) {}
1.94 + explicit GSCanonicalEntry(const SkPaint* paint)
1.95 + : fGraphicState(NULL),
1.96 + fPaint(paint) {}
1.97 + };
1.98 +
1.99 + // This should be made a hash table if performance is a problem.
1.100 + static SkTDArray<GSCanonicalEntry>& CanonicalPaints();
1.101 + static SkBaseMutex& CanonicalPaintsMutex();
1.102 +
1.103 + SkPDFGraphicState();
1.104 + explicit SkPDFGraphicState(const SkPaint& paint);
1.105 +
1.106 + void populateDict();
1.107 +
1.108 + static SkPDFObject* GetInvertFunction();
1.109 +
1.110 + static int Find(const SkPaint& paint);
1.111 + typedef SkPDFDict INHERITED;
1.112 +};
1.113 +
1.114 +#endif
