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136 lines
4.3 KiB
C++
136 lines
4.3 KiB
C++
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/*
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* Copyright 2011 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkLayerDrawLooper_DEFINED
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#define SkLayerDrawLooper_DEFINED
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#include "SkDrawLooper.h"
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#include "SkXfermode.h"
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struct SkPoint;
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class SK_API SkLayerDrawLooper : public SkDrawLooper {
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public:
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SkLayerDrawLooper();
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virtual ~SkLayerDrawLooper();
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/**
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* Bits specifies which aspects of the layer's paint should replace the
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* corresponding aspects on the draw's paint.
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* kEntirePaint_Bits means use the layer's paint completely.
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* 0 means ignore the layer's paint... except that LayerInfo's fFlagsMask
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* and fColorMode are always applied.
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*/
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enum Bits {
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kStyle_Bit = 1 << 0, //!< use this layer's Style/stroke settings
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kTextSkewX_Bit = 1 << 1, //!< use this layer's textskewx
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kPathEffect_Bit = 1 << 2, //!< use this layer's patheffect
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kMaskFilter_Bit = 1 << 3, //!< use this layer's maskfilter
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kShader_Bit = 1 << 4, //!< use this layer's shader
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kColorFilter_Bit = 1 << 5, //!< use this layer's colorfilter
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kXfermode_Bit = 1 << 6, //!< use this layer's xfermode
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/**
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* Use the layer's paint entirely, with these exceptions:
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* - We never override the draw's paint's text_encoding, since that is
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* used to interpret the text/len parameters in draw[Pos]Text.
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* - Flags and Color are always computed using the LayerInfo's
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* fFlagsMask and fColorMode.
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*/
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kEntirePaint_Bits = -1
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};
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typedef int32_t BitFlags;
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/**
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* Info for how to apply the layer's paint and offset.
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*
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* fFlagsMask selects which flags in the layer's paint should be applied.
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* result = (draw-flags & ~fFlagsMask) | (layer-flags & fFlagsMask)
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* In the extreme:
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* If fFlagsMask is 0, we ignore all of the layer's flags
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* If fFlagsMask is -1, we use all of the layer's flags
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*
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* fColorMode controls how we compute the final color for the layer:
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* The layer's paint's color is treated as the SRC
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* The draw's paint's color is treated as the DST
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* final-color = Mode(layers-color, draws-color);
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* Any SkXfermode::Mode will work. Two common choices are:
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* kSrc_Mode: to use the layer's color, ignoring the draw's
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* kDst_Mode: to just keep the draw's color, ignoring the layer's
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*/
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struct SK_API LayerInfo {
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uint32_t fFlagsMask; // SkPaint::Flags
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BitFlags fPaintBits;
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SkXfermode::Mode fColorMode;
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SkVector fOffset;
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bool fPostTranslate; //!< applies to fOffset
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/**
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* Initial the LayerInfo. Defaults to settings that will draw the
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* layer with no changes: e.g.
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* fPaintBits == 0
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* fColorMode == kDst_Mode
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* fOffset == (0, 0)
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*/
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LayerInfo();
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};
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/**
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* Call for each layer you want to add (from top to bottom).
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* This returns a paint you can modify, but that ptr is only valid until
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* the next call made to addLayer().
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*/
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SkPaint* addLayer(const LayerInfo&);
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/**
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* This layer will draw with the original paint, ad the specified offset
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*/
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void addLayer(SkScalar dx, SkScalar dy);
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/**
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* This layer will with the original paint and no offset.
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*/
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void addLayer() { this->addLayer(0, 0); }
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// overrides from SkDrawLooper
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virtual void init(SkCanvas*);
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virtual bool next(SkCanvas*, SkPaint* paint);
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SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkLayerDrawLooper)
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protected:
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SkLayerDrawLooper(SkFlattenableReadBuffer&);
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virtual void flatten(SkFlattenableWriteBuffer&) const SK_OVERRIDE;
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private:
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struct Rec {
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Rec* fNext;
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SkPaint fPaint;
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LayerInfo fInfo;
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static Rec* Reverse(Rec*);
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};
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Rec* fRecs;
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int fCount;
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// state-machine during the init/next cycle
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Rec* fCurrRec;
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static void ApplyInfo(SkPaint* dst, const SkPaint& src, const LayerInfo&);
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class MyRegistrar : public SkFlattenable::Registrar {
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public:
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MyRegistrar();
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};
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typedef SkDrawLooper INHERITED;
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};
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#endif
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