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57 lines
2.2 KiB
57 lines
2.2 KiB
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/*
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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 SkShadowUtils_DEFINED
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#define SkShadowUtils_DEFINED
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#include "SkColor.h"
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#include "SkPoint3.h"
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#include "SkScalar.h"
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#include "../private/SkShadowFlags.h"
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class SkCanvas;
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class SkPath;
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class SkResourceCache;
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class SK_API SkShadowUtils {
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public:
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/**
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* Draw an offset spot shadow and outlining ambient shadow for the given path using a disc
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* light. The shadow may be cached, depending on the path type and canvas matrix. If the
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* matrix is perspective or the path is volatile, it will not be cached.
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*
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* @param canvas The canvas on which to draw the shadows.
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* @param path The occluder used to generate the shadows.
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* @param zPlaneParams Values for the plane function which returns the Z offset of the
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* occluder from the canvas based on local x and y values (the current matrix is not applied).
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* @param lightPos The 3D position of the light relative to the canvas plane. This is
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* independent of the canvas's current matrix.
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* @param lightRadius The radius of the disc light.
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* @param ambientColor The color of the ambient shadow.
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* @param spotColor The color of the spot shadow.
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* @param flags Options controlling opaque occluder optimizations and shadow appearance. See
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* SkShadowFlags.
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*/
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static void DrawShadow(SkCanvas* canvas, const SkPath& path, const SkPoint3& zPlaneParams,
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const SkPoint3& lightPos, SkScalar lightRadius,
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SkColor ambientColor, SkColor spotColor,
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uint32_t flags = SkShadowFlags::kNone_ShadowFlag);
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/**
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* Helper routine to compute color values for one-pass tonal alpha.
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*
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* @param inAmbientColor Original ambient color
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* @param inSpotColor Original spot color
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* @param outAmbientColor Modified ambient color
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* @param outSpotColor Modified spot color
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*/
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static void ComputeTonalColors(SkColor inAmbientColor, SkColor inSpotColor,
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SkColor* outAmbientColor, SkColor* outSpotColor);
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};
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#endif
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