a556684b10
Bug: skia:7263 Change-Id: I90fcc35e8d070b324287139ebecc3d15dbec0137 Reviewed-on: https://skia-review.googlesource.com/109164 Reviewed-by: Robert Phillips <robertphillips@google.com> Commit-Queue: Jim Van Verth <jvanverth@google.com>
57 lines
2.2 KiB
C++
57 lines
2.2 KiB
C++
|
|
/*
|
|
* 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 "SkColor.h"
|
|
#include "SkPoint3.h"
|
|
#include "SkScalar.h"
|
|
#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
|