40 lines
1.2 KiB
C
40 lines
1.2 KiB
C
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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 "SkScalar.h"
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class SkCanvas;
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class SkPath;
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class SkShadowUtils {
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public:
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enum ShadowFlags {
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kNone_ShadowFlag = 0x00,
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/** The occluding object is not opaque. Knowing that the occluder is opaque allows
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* us to cull shadow geometry behind it and improve performance. */
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kTransparentOccluder_ShadowFlag = 0x01,
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/** Use a larger umbra for a darker shadow */
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kLargerUmbra_ShadowFlag = 0x02,
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/** Use a Gaussian for the edge function rather than smoothstep */
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kGaussianEdge_ShadowFlag = 0x04,
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/** mask for all shadow flags */
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kAll_ShadowFlag = 0x07
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};
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// Draw an offset spot shadow and outlining ambient shadow for the given path.
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static void DrawShadow(SkCanvas*, const SkPath& path, SkScalar occluderHeight,
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const SkPoint3& lightPos, SkScalar lightRadius,
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SkScalar ambientAlpha, SkScalar spotAlpha, SkColor color,
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uint32_t flags = kNone_ShadowFlag);
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};
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#endif
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