fb4bce8322
Currently, gradients are PaintNode subclasses - which limits their applicability to leaf DAG nodes. In order to support generalized gradient/shader effects: * introduce a new Shader base class * refactor gradients as Shader subclasses * introduce ShaderPaint (to support current Gradient-as-paint use) * introduce ShaderEffect (to support future Gradient-as-effect use) Tangentially: * rename SkSGPaintNode.h -> SkSGPaint.h * consolidate sksg::Color into SkSGPaint.h Change-Id: I94ba949f4504c09cfde4a4f030d927411fdd66a2 Reviewed-on: https://skia-review.googlesource.com/c/skia/+/205263 Reviewed-by: Mike Reed <reed@google.com> Commit-Queue: Florin Malita <fmalita@chromium.org>
114 lines
3.5 KiB
C++
114 lines
3.5 KiB
C++
/*
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* Copyright 2017 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 SkSGRenderNode_DEFINED
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#define SkSGRenderNode_DEFINED
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#include "SkSGNode.h"
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#include "SkBlendMode.h"
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#include "SkColorFilter.h"
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#include "SkShader.h"
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class SkCanvas;
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class SkImageFilter;
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class SkPaint;
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namespace sksg {
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/**
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* Base class for nodes which can render to a canvas.
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*/
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class RenderNode : public Node {
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protected:
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struct RenderContext;
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public:
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// Render the node and its descendants to the canvas.
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void render(SkCanvas*, const RenderContext* = nullptr) const;
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// Perform a front-to-back hit-test, and return the RenderNode located at |point|.
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// Normally, hit-testing stops at leaf Draw nodes.
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const RenderNode* nodeAt(const SkPoint& point) const;
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protected:
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explicit RenderNode(uint32_t inval_traits = 0);
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virtual void onRender(SkCanvas*, const RenderContext*) const = 0;
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virtual const RenderNode* onNodeAt(const SkPoint& p) const = 0;
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// Paint property overrides.
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// These are deferred until we can determine whether they can be applied to the individual
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// draw paints, or whether they require content isolation (applied to a layer).
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struct RenderContext {
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sk_sp<SkColorFilter> fColorFilter;
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sk_sp<SkShader> fShader;
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float fOpacity = 1;
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SkBlendMode fBlendMode = SkBlendMode::kSrcOver;
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// Returns true if the paint was modified.
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bool modulatePaint(SkPaint*) const;
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};
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class ScopedRenderContext final {
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public:
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ScopedRenderContext(SkCanvas*, const RenderContext*);
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~ScopedRenderContext();
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ScopedRenderContext(ScopedRenderContext&& that) { *this = std::move(that); }
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ScopedRenderContext& operator=(ScopedRenderContext&& that) {
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fCanvas = that.fCanvas;
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fCtx = std::move(that.fCtx);
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fRestoreCount = that.fRestoreCount;
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// scope ownership is being transferred
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that.fRestoreCount = -1;
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return *this;
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}
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operator const RenderContext* () const { return &fCtx; }
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// Add (cumulative) paint overrides to a render node sub-DAG.
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ScopedRenderContext&& modulateOpacity(float opacity);
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ScopedRenderContext&& modulateColorFilter(sk_sp<SkColorFilter>);
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ScopedRenderContext&& modulateShader(sk_sp<SkShader>);
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ScopedRenderContext&& modulateBlendMode(SkBlendMode);
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// Force content isolation for a node sub-DAG by applying the RenderContext
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// overrides via a layer.
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ScopedRenderContext&& setIsolation(const SkRect& bounds, bool do_isolate);
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// Similarly, force content isolation by applying the RenderContext overrides and
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// an image filter via a single layer.
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ScopedRenderContext&& setFilterIsolation(const SkRect& bounds, sk_sp<SkImageFilter>);
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private:
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// stack-only
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void* operator new(size_t) = delete;
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void* operator new(size_t, void*) = delete;
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// Scopes cannot be copied.
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ScopedRenderContext(const ScopedRenderContext&) = delete;
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ScopedRenderContext& operator=(const ScopedRenderContext&) = delete;
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SkCanvas* fCanvas;
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RenderContext fCtx;
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int fRestoreCount;
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};
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private:
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friend class ImageFilterEffect;
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typedef Node INHERITED;
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};
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} // namespace sksg
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#endif // SkSGRenderNode_DEFINED
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