27be14f2ca
This breaks out the SkAlphaType and SkColorType enums into their own files, which lets us break the dependency between SkColor and SkImageInfo. It does not yet sever the link, but we plan to land this so as to migrate clients to the new enum files if necessary. This is estimated to save Chrome 230 MB of build size [1] (about 0.1%) http://screen/4dMqPC9rvAyCk6y [1] https://commondatastorage.googleapis.com/chromium-browser-clang/chrome_includes_2022-03-08_182556.html#view=edges&filter=%5Ethird_party%2Fskia%2Finclude%2Fcore%2FSkColor%5C.h%24&sort=asize&reverse=&includer=%5Ethird_party%2Fskia%2Finclude%2Fcore%2FSkColor%5C.h%24&included=&limit=1000 Change-Id: I331d414fe2996632ab11825c1092060ff5fe2ebd Bug: 242216 Reviewed-on: https://skia-review.googlesource.com/c/skia/+/517678 Reviewed-by: Ben Wagner <bungeman@google.com> Reviewed-by: Brian Osman <brianosman@google.com> Commit-Queue: Kevin Lubick <kjlubick@google.com>
87 lines
4.1 KiB
C++
87 lines
4.1 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 "include/core/SkColor.h"
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#include "include/core/SkPoint3.h"
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#include "include/core/SkScalar.h"
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#include "include/private/SkShadowFlags.h"
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class SkCanvas;
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class SkMatrix;
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class SkPath;
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class SkResourceCache;
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struct SkRect;
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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 Generally, the 3D position of the light relative to the canvas plane.
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* If kDirectionalLight_ShadowFlag is set, this specifies a vector pointing
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* towards the light.
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* @param lightRadius Generally, the radius of the disc light.
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* If DirectionalLight_ShadowFlag is set, this specifies the amount of
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* blur when the occluder is at Z offset == 1. The blur will grow linearly
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* as the Z value increases.
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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, shadow appearance,
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* and light position. See 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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* Generate bounding box for shadows relative to path. Includes both the ambient and spot
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* shadow bounds.
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*
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* @param ctm Current transformation matrix to device space.
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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 Generally, the 3D position of the light relative to the canvas plane.
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* If kDirectionalLight_ShadowFlag is set, this specifies a vector pointing
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* towards the light.
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* @param lightRadius Generally, the radius of the disc light.
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* If DirectionalLight_ShadowFlag is set, this specifies the amount of
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* blur when the occluder is at Z offset == 1. The blur will grow linearly
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* as the Z value increases.
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* @param flags Options controlling opaque occluder optimizations, shadow appearance,
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* and light position. See SkShadowFlags.
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* @param bounds Return value for shadow bounding box.
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* @return Returns true if successful, false otherwise.
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*/
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static bool GetLocalBounds(const SkMatrix& ctm, const SkPath& path,
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const SkPoint3& zPlaneParams, const SkPoint3& lightPos,
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SkScalar lightRadius, uint32_t flags, SkRect* bounds);
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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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