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- /*
- * Copyright 2017 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
- #ifndef SkShadowUtils_DEFINED
- #define SkShadowUtils_DEFINED
- #include "include/core/SkColor.h"
- #include "include/core/SkPoint3.h"
- #include "include/core/SkScalar.h"
- #include "include/private/SkShadowFlags.h"
- class SkCanvas;
- class SkPath;
- class SkResourceCache;
- class SK_API SkShadowUtils {
- public:
- /**
- * Draw an offset spot shadow and outlining ambient shadow for the given path using a disc
- * light. The shadow may be cached, depending on the path type and canvas matrix. If the
- * matrix is perspective or the path is volatile, it will not be cached.
- *
- * @param canvas The canvas on which to draw the shadows.
- * @param path The occluder used to generate the shadows.
- * @param zPlaneParams Values for the plane function which returns the Z offset of the
- * occluder from the canvas based on local x and y values (the current matrix is not applied).
- * @param lightPos The 3D position of the light relative to the canvas plane. This is
- * independent of the canvas's current matrix.
- * @param lightRadius The radius of the disc light.
- * @param ambientColor The color of the ambient shadow.
- * @param spotColor The color of the spot shadow.
- * @param flags Options controlling opaque occluder optimizations and shadow appearance. See
- * SkShadowFlags.
- */
- static void DrawShadow(SkCanvas* canvas, const SkPath& path, const SkPoint3& zPlaneParams,
- const SkPoint3& lightPos, SkScalar lightRadius,
- SkColor ambientColor, SkColor spotColor,
- uint32_t flags = SkShadowFlags::kNone_ShadowFlag);
- /**
- * Helper routine to compute color values for one-pass tonal alpha.
- *
- * @param inAmbientColor Original ambient color
- * @param inSpotColor Original spot color
- * @param outAmbientColor Modified ambient color
- * @param outSpotColor Modified spot color
- */
- static void ComputeTonalColors(SkColor inAmbientColor, SkColor inSpotColor,
- SkColor* outAmbientColor, SkColor* outSpotColor);
- };
- #endif
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