From b436655ad5c40a04b65c1642d0a0e781ce296c96 Mon Sep 17 00:00:00 2001 From: Jim Van Verth Date: Mon, 27 Mar 2017 14:25:29 -0400 Subject: Add height function to shadow tessellators. Prep work for adding perspective support. Bug: skia: Change-Id: Id07d3050afb3f0d001b885e482adb8d03125b619 Reviewed-on: https://skia-review.googlesource.com/10167 Commit-Queue: Jim Van Verth Reviewed-by: Brian Salomon --- include/utils/SkShadowUtils.h | 27 ++++++++++++++++++++++++++- 1 file changed, 26 insertions(+), 1 deletion(-) (limited to 'include/utils') diff --git a/include/utils/SkShadowUtils.h b/include/utils/SkShadowUtils.h index 3339812c34..01514a46ff 100644 --- a/include/utils/SkShadowUtils.h +++ b/include/utils/SkShadowUtils.h @@ -11,6 +11,7 @@ #include "SkColor.h" #include "SkScalar.h" #include "../private/SkShadowFlags.h" +#include class SkCanvas; class SkPath; @@ -25,7 +26,7 @@ public: * @param canvas The canvas on which to draw the shadows. * @param path The occluder used to generate the shadows. * @param occluderHeight The vertical offset of the occluder from the canvas. This is - * indepdendent of the canvas's current matrix. + * independent of the canvas's current matrix. * @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. @@ -41,6 +42,30 @@ public: SkScalar spotAlpha, SkColor color, uint32_t flags = SkShadowFlags::kNone_ShadowFlag, SkResourceCache* cache = nullptr); + + /** + * Draw an offset spot shadow and outlining ambient shadow for the given path using a disc + * light. Takes a function to vary the z value based on the transformed x and y position. + * This shadow will not be cached, as the assumption is that this will be used for animation. + * + * @param canvas The canvas on which to draw the shadows. + * @param path The occluder used to generate the shadows. + * @param heightFunc A function which returns the vertical 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 ambientAlpha The maximum alpha of the ambient shadow. + * @param spotAlpha The maxium alpha of the spot shadow. + * @param color The shadow color. + * @param flags Options controlling opaque occluder optimizations and shadow appearance. See + * SkShadowFlags. + */ + static void DrawUncachedShadow(SkCanvas* canvas, const SkPath& path, + std::function heightFunc, + const SkPoint3& lightPos, SkScalar lightRadius, + SkScalar ambientAlpha, SkScalar spotAlpha, SkColor color, + uint32_t flags = SkShadowFlags::kNone_ShadowFlag); }; #endif -- cgit v1.2.3