Revert "Alloc glyph image correctly for SkMask::k3D_Format."

This reverts commit 1662257bdaaaf26b016bf2a3e329c34f7f5ed581.

Reason for revert: Android still using this API

Original change's description:
> Alloc glyph image correctly for SkMask::k3D_Format.
> 
> Remove the no longer used outside Skia SK_SUPPORT_LEGACY_EMBOSSMASKFILTER
> define, and either delete the code it guards or update it to use the new
> emboss mask filter factory.
> 
> Re-enable the code to test the emboss mask filter.
> 
> Add a test to ensure that embossed text is drawn correctly, as before
> glyphs did not allocate the proper amount of memory for the k3D_Format
> which the emboss mask filter produces.
> 
> Fixes SkEmbossMask::Emboss to write the whole of the mul and add planes
> to avoid pixel differences and MemorySanitizer errors.
> 
> Update the GPU to understand the k3D_Format and use just the alpha
> plane, ignoring the mul and add plane which it currently cannot support.
> 
> Change-Id: Icac1a3f37d6e8c6be3151df570f5e14111e18585
> Reviewed-on: https://skia-review.googlesource.com/70260
> Reviewed-by: Herb Derby <herb@google.com>
> Reviewed-on: https://skia-review.googlesource.com/70962
> Commit-Queue: Ben Wagner <bungeman@google.com>

TBR=djsollen@google.com,bungeman@google.com,herb@google.com

Change-Id: Id6625bae8d3bd70ce7aa3045348c04fdd146c637
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/71183
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/include/effects/SkBlurMaskFilter.h b/include/effects/SkBlurMaskFilter.h
index e000732a85..8b032e50ee 100644
--- a/include/effects/SkBlurMaskFilter.h
+++ b/include/effects/SkBlurMaskFilter.h
@@ -48,6 +48,19 @@ public:
         return Make(style, sigma, SkRect::MakeEmpty(), flags);
     }
 
+#ifdef SK_SUPPORT_LEGACY_EMBOSSMASKFILTER
+    /** Create an emboss maskfilter
+        @param blurSigma    standard deviation of the Gaussian blur to apply
+                            before applying lighting (e.g. 3)
+        @param direction    array of 3 scalars [x, y, z] specifying the direction of the light source
+        @param ambient      0...1 amount of ambient light
+        @param specular     coefficient for specular highlights (e.g. 8)
+        @return the emboss maskfilter
+    */
+    static sk_sp<SkMaskFilter> MakeEmboss(SkScalar blurSigma, const SkScalar direction[3],
+                                          SkScalar ambient, SkScalar specular);
+#endif
+
     static const int kMaxDivisions = 6;
 
     // This method computes all the parameters for drawing a partially occluded nine-patched