1 files changed, 161 insertions, 0 deletions
diff --git a/gfx/skia/skia/include/effects/SkLayerDrawLooper.h b/gfx/skia/skia/include/effects/SkLayerDrawLooper.h
new file mode 100644
index 0000000000..1e875b58cc
--- /dev/null
+++ b/gfx/skia/skia/include/effects/SkLayerDrawLooper.h
@@ -0,0 +1,161 @@
+/*
+ * Copyright 2011 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkLayerDrawLooper_DEFINED
+#define SkLayerDrawLooper_DEFINED
+
+#include "include/core/SkBlendMode.h"
+#include "include/core/SkDrawLooper.h"
+#include "include/core/SkPaint.h"
+#include "include/core/SkPoint.h"
+
+#ifndef SK_SUPPORT_LEGACY_DRAWLOOPER
+#error "SkDrawLooper is unsupported"
+#endif
+
+/**
+ *  DEPRECATED: No longer supported by Skia.
+ */
+class SK_API SkLayerDrawLooper : public SkDrawLooper {
+public:
+    ~SkLayerDrawLooper() override;
+
+    /**
+     *  Bits specifies which aspects of the layer's paint should replace the
+     *  corresponding aspects on the draw's paint.
+     *  kEntirePaint_Bits means use the layer's paint completely.
+     *  0 means ignore the layer's paint... except for fColorMode, which is
+     *  always applied.
+     */
+    enum Bits {
+        kStyle_Bit      = 1 << 0,   //!< use this layer's Style/stroke settings
+        kPathEffect_Bit = 1 << 2,   //!< use this layer's patheffect
+        kMaskFilter_Bit = 1 << 3,   //!< use this layer's maskfilter
+        kShader_Bit     = 1 << 4,   //!< use this layer's shader
+        kColorFilter_Bit = 1 << 5,  //!< use this layer's colorfilter
+        kXfermode_Bit   = 1 << 6,   //!< use this layer's xfermode
+
+        // unsupported kTextSkewX_Bit  = 1 << 1,
+
+        /**
+         *  Use the layer's paint entirely, with these exceptions:
+         *  - We never override the draw's paint's text_encoding, since that is
+         *    used to interpret the text/len parameters in draw[Pos]Text.
+         *  - Color is always computed using the LayerInfo's fColorMode.
+         */
+        kEntirePaint_Bits = -1
+
+    };
+    typedef int32_t BitFlags;
+
+    /**
+     *  Info for how to apply the layer's paint and offset.
+     *
+     *  fColorMode controls how we compute the final color for the layer:
+     *      The layer's paint's color is treated as the SRC
+     *      The draw's paint's color is treated as the DST
+     *      final-color = Mode(layers-color, draws-color);
+     *  Any SkBlendMode will work. Two common choices are:
+     *      kSrc: to use the layer's color, ignoring the draw's
+     *      kDst: to just keep the draw's color, ignoring the layer's
+     */
+    struct SK_API LayerInfo {
+        BitFlags    fPaintBits;
+        SkBlendMode fColorMode;
+        SkVector    fOffset;
+        bool        fPostTranslate; //!< applies to fOffset
+
+        /**
+         *  Initial the LayerInfo. Defaults to settings that will draw the
+         *  layer with no changes: e.g.
+         *      fPaintBits == 0
+         *      fColorMode == kDst_Mode
+         *      fOffset == (0, 0)
+         */
+        LayerInfo();
+    };
+
+    SkDrawLooper::Context* makeContext(SkArenaAlloc*) const override;
+
+    bool asABlurShadow(BlurShadowRec* rec) const override;
+
+protected:
+    SkLayerDrawLooper();
+
+    void flatten(SkWriteBuffer&) const override;
+
+private:
+    SK_FLATTENABLE_HOOKS(SkLayerDrawLooper)
+
+    struct Rec {
+        Rec*    fNext;
+        SkPaint fPaint;
+        LayerInfo fInfo;
+    };
+    Rec*    fRecs;
+    int     fCount;
+
+    // state-machine during the init/next cycle
+    class LayerDrawLooperContext : public SkDrawLooper::Context {
+    public:
+        explicit LayerDrawLooperContext(const SkLayerDrawLooper* looper);
+
+    protected:
+        bool next(Info*, SkPaint* paint) override;
+
+    private:
+        Rec* fCurrRec;
+
+        static void ApplyInfo(SkPaint* dst, const SkPaint& src, const LayerInfo&);
+    };
+
+    using INHERITED = SkDrawLooper;
+
+public:
+    class SK_API Builder {
+    public:
+        Builder();
+
+        ~Builder();
+
+        /**
+         *  Call for each layer you want to add (from top to bottom).
+         *  This returns a paint you can modify, but that ptr is only valid until
+         *  the next call made to addLayer().
+         */
+        SkPaint* addLayer(const LayerInfo&);
+
+        /**
+         *  This layer will draw with the original paint, at the specified offset
+         */
+        void addLayer(SkScalar dx, SkScalar dy);
+
+        /**
+         *  This layer will with the original paint and no offset.
+         */
+        void addLayer() { this->addLayer(0, 0); }
+
+        /// Similar to addLayer, but adds a layer to the top.
+        SkPaint* addLayerOnTop(const LayerInfo&);
+
+        /**
+          * Pass list of layers on to newly built looper and return it. This will
+          * also reset the builder, so it can be used to build another looper.
+          */
+        sk_sp<SkDrawLooper> detach();
+
+    private:
+        Builder(const Builder&) = delete;
+        Builder& operator=(const Builder&) = delete;
+
+        Rec* fRecs;
+        Rec* fTopRec;
+        int  fCount;
+    };
+};
+
+#endif