b436655ad5
Prep work for adding perspective support. Bug: skia: Change-Id: Id07d3050afb3f0d001b885e482adb8d03125b619 Reviewed-on: https://skia-review.googlesource.com/10167 Commit-Queue: Jim Van Verth <jvanverth@google.com> Reviewed-by: Brian Salomon <bsalomon@google.com>
72 lines
3.2 KiB
C++
72 lines
3.2 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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#include "../private/SkShadowFlags.h"
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#include <functional>
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class SkCanvas;
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class SkPath;
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class SkResourceCache;
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class 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.
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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 occluderHeight The vertical offset of the occluder from the canvas. This is
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* independent of the canvas's current matrix.
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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 ambientAlpha The maximum alpha of the ambient shadow.
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* @param spotAlpha The maxium alpha of the spot shadow.
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* @param color The shadow color.
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* @param flags Options controlling opaque occluder optimizations and shadow appearance. See
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* SkShadowFlags.
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* @param cache Used for testing purposes. Clients should pass nullptr (default).
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*/
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static void DrawShadow(SkCanvas* canvas, const SkPath& path, SkScalar occluderHeight,
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const SkPoint3& lightPos, SkScalar lightRadius, SkScalar ambientAlpha,
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SkScalar spotAlpha, SkColor color,
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uint32_t flags = SkShadowFlags::kNone_ShadowFlag,
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SkResourceCache* cache = nullptr);
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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. Takes a function to vary the z value based on the transformed x and y position.
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* This shadow will not be cached, as the assumption is that this will be used for animation.
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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 heightFunc A function which returns the vertical offset of the occluder from the
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* 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 ambientAlpha The maximum alpha of the ambient shadow.
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* @param spotAlpha The maxium alpha of the spot shadow.
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* @param color The shadow color.
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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 DrawUncachedShadow(SkCanvas* canvas, const SkPath& path,
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std::function<SkScalar(SkScalar, SkScalar)> heightFunc,
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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 = SkShadowFlags::kNone_ShadowFlag);
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};
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#endif
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