Use WriteVertexData in GrTessellator, remove all DefaultGeoProc structs

The structs were previously used to compute vertex strides, and in a
couple places to do vertex writing (like this). We're moving to get
stride from the GP, and using WriteVertexData to serialize into buffers,
so these aren't needed.

Bug: skia:
Change-Id: If7eb89564e43231633290c8d19b68181e0efa89a
Reviewed-on: https://skia-review.googlesource.com/c/170720
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>

src/gpu/GrDefaultGeoProcFactory.h

@@ -19,51 +19,6 @@ constexpr int kMaxBones = 80; // Supports up to 80 bones per mesh.
  * view matrix and wire through color, coverage, UV coords if requested.
  */
 namespace GrDefaultGeoProcFactory {
-    // Structs for adding vertex attributes
-    struct PositionAttr {
-        SkPoint fPosition;
-    };
-
-    struct PositionCoverageAttr {
-        SkPoint fPosition;
-        float   fCoverage;
-    };
-
-    struct PositionColorAttr {
-        SkPoint fPosition;
-        SkColor fColor;
-    };
-
-    struct PositionColorCoverageAttr {
-        SkPoint fPosition;
-        SkColor fColor;
-        float   fCoverage;
-    };
-
-    struct PositionLocalCoordAttr {
-        SkPoint fPosition;
-        SkPoint fLocalCoord;
-    };
-
-    struct PositionLocalCoordCoverageAttr {
-        SkPoint fPosition;
-        SkPoint fLocalCoord;
-        float   fCoverage;
-    };
-
-    struct PositionColorLocalCoordAttr {
-        SkPoint fPosition;
-        GrColor fColor;
-        SkPoint fLocalCoord;
-    };
-
-    struct PositionColorLocalCoordCoverageAttr {
-        SkPoint fPosition;
-        GrColor fColor;
-        SkPoint fLocalCoord;
-        float   fCoverage;
-    };
-
     struct Color {
         enum Type {
             kPremulGrColorUniform_Type,

src/gpu/GrTessellator.cpp

@@ -9,6 +9,7 @@
 
 #include "GrDefaultGeoProcFactory.h"
 #include "GrPathUtils.h"
+#include "ops/GrMeshDrawOp.h"
 
 #include "SkArenaAlloc.h"
 #include "SkGeometry.h"
@@ -200,23 +201,14 @@ struct Comparator {
 
 inline void* emit_vertex(Vertex* v, const AAParams* aaParams, void* data) {
     if (!aaParams) {
-        SkPoint* d = static_cast<SkPoint*>(data);
-        *d++ = v->fPoint;
-        return d;
+        return GrMeshDrawOp::WriteVertexData(data, v->fPoint);
     }
     if (aaParams->fTweakAlpha) {
-        auto d = static_cast<GrDefaultGeoProcFactory::PositionColorAttr*>(data);
-        d->fPosition = v->fPoint;
-        d->fColor = SkAlphaMulQ(aaParams->fColor, SkAlpha255To256(v->fAlpha));
-        d++;
-        return d;
-    }
-    auto d = static_cast<GrDefaultGeoProcFactory::PositionColorCoverageAttr*>(data);
-    d->fPosition = v->fPoint;
-    d->fColor = aaParams->fColor;
-    d->fCoverage = GrNormalizeByteToFloat(v->fAlpha);
-    d++;
-    return d;
+        GrColor color = SkAlphaMulQ(aaParams->fColor, SkAlpha255To256(v->fAlpha));
+        return GrMeshDrawOp::WriteVertexData(data, v->fPoint, color);
+    }
+    float coverage = GrNormalizeByteToFloat(v->fAlpha);
+    return GrMeshDrawOp::WriteVertexData(data, v->fPoint, aaParams->fColor, coverage);
 }
 
 void* emit_triangle(Vertex* v0, Vertex* v1, Vertex* v2, const AAParams* aaParams, void* data) {