Improve caching of dashed paths in GrStencilAndCoverPathRenderer

src/gpu/GrPath.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrPath.h"
 
-template<int NumBits> static uint64_t get_top_n_float_bits(float f) {
-    char* floatData = reinterpret_cast<char*>(&f);
-    uint32_t floatBits = *reinterpret_cast<uint32_t*>(floatData);
-    return floatBits >> (32 - NumBits);
+void GrPath::ComputeKey(const SkPath& path, const GrStrokeInfo& stroke, GrUniqueKey* key) {
+    static const GrUniqueKey::Domain kPathDomain = GrUniqueKey::GenerateDomain();
+    int strokeDataCnt = stroke.computeUniqueKeyFragmentData32Cnt();
+    GrUniqueKey::Builder builder(key, kPathDomain, 2 + strokeDataCnt);
+    builder[0] = path.getGenerationID();
+    builder[1] = path.getFillType();
+    if (strokeDataCnt > 0) {
+        stroke.asUniqueKeyFragment(&builder[2]);
+    }
 }
 
-void GrPath::ComputeKey(const SkPath& path, const SkStrokeRec& stroke, GrUniqueKey* key) {
-    static const GrUniqueKey::Domain kDomain = GrUniqueKey::GenerateDomain();
-    GrUniqueKey::Builder builder(key, kDomain, 3);
-    *reinterpret_cast<uint64_t*>(&builder[0]) = ComputeStrokeKey(stroke);
-    builder[2] = path.getGenerationID();
-}
-
-uint64_t GrPath::ComputeStrokeKey(const SkStrokeRec& stroke) {
-    enum {
-        kStyleBits = 2,
-        kJoinBits = 2,
-        kCapBits = 2,
-        kWidthBits = 29,
-        kMiterBits = 29,
-
-        kJoinShift = kStyleBits,
-        kCapShift = kJoinShift + kJoinBits,
-        kWidthShift = kCapShift + kCapBits,
-        kMiterShift = kWidthShift + kWidthBits,
-
-        kBitCount = kMiterShift + kMiterBits
-    };
-
-    SK_COMPILE_ASSERT(SkStrokeRec::kStyleCount <= (1 << kStyleBits), style_shift_will_be_wrong);
-    SK_COMPILE_ASSERT(SkPaint::kJoinCount <= (1 << kJoinBits), cap_shift_will_be_wrong);
-    SK_COMPILE_ASSERT(SkPaint::kCapCount <= (1 << kCapBits), miter_shift_will_be_wrong);
-    SK_COMPILE_ASSERT(kBitCount == 64, wrong_stroke_key_size);
-
-    if (!stroke.needToApply()) {
-        return SkStrokeRec::kFill_Style;
-    }
-
-    uint64_t key = stroke.getStyle();
-    key |= stroke.getJoin() << kJoinShift;
-    key |= stroke.getCap() << kCapShift;
-    key |= get_top_n_float_bits<kWidthBits>(stroke.getWidth()) << kWidthShift;
-    key |= get_top_n_float_bits<kMiterBits>(stroke.getMiter()) << kMiterShift;
-
-    return key;
-}