Revert of Replace GrStrokeInfo with GrStyle.

src/gpu/GrStrokeInfo.cpp

+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "GrStrokeInfo.h"
+#include "GrResourceKey.h"
+#include "SkDashPathPriv.h"
+
+bool all_dash_intervals_zero(const SkScalar* intervals, int count) {
+    for (int i = 0 ; i < count; ++i) {
+        if (intervals[i] != 0) {
+            return false;
+        }
+    }
+    return true;
+}
+
+bool GrStrokeInfo::applyDashToPath(SkPath* dst, GrStrokeInfo* dstStrokeInfo,
+                                   const SkPath& src) const {
+    if (this->isDashed()) {
+        SkPathEffect::DashInfo info;
+        info.fIntervals = fIntervals.get();
+        info.fCount = fIntervals.count();
+        info.fPhase = fDashPhase;
+        GrStrokeInfo filteredStroke(*this, false);
+        // Handle the case where all intervals are 0 and we simply drop the dash effect
+        if (all_dash_intervals_zero(fIntervals.get(), fIntervals.count())) {
+            *dstStrokeInfo = filteredStroke;
+            *dst = src;
+            return true;
+        }
+        // See if we can filter the dash into a path on cpu
+        if (SkDashPath::FilterDashPath(dst, src, &filteredStroke, nullptr, info)) {
+            *dstStrokeInfo = filteredStroke;
+            return true;
+        }
+    }
+    return false;
+}
+
+void GrStrokeInfo::asUniqueKeyFragment(uint32_t* data) const {
+    const int kSkScalarData32Cnt = sizeof(SkScalar) / sizeof(uint32_t);
+    enum {
+        kStyleBits = 2,
+        kJoinBits = 2,
+        kCapBits = 32 - kStyleBits - kJoinBits,
+
+        kJoinShift = kStyleBits,
+        kCapShift = kJoinShift + kJoinBits,
+    };
+
+    static_assert(SkStrokeRec::kStyleCount <= (1 << kStyleBits), "style_shift_will_be_wrong");
+    static_assert(SkPaint::kJoinCount <= (1 << kJoinBits), "cap_shift_will_be_wrong");
+    static_assert(SkPaint::kCapCount <= (1 << kCapBits), "cap_does_not_fit");
+    uint32_t styleKey = this->getStyle();
+    if (this->needToApply()) {
+        styleKey |= this->getJoin() << kJoinShift;
+        styleKey |= this->getCap() << kCapShift;
+    }
+    int i = 0;
+    data[i++] = styleKey;
+
+    // Memcpy the scalar fields. Does not "reinterpret_cast<SkScalar&>(data[i]) = ..." due to
+    // scalars having more strict alignment requirements than what data can guarantee. The
+    // compiler should optimize memcpys to assignments.
+    SkScalar scalar;
+    scalar = this->getMiter();
+    memcpy(&data[i], &scalar, sizeof(scalar));
+    i += kSkScalarData32Cnt;
+
+    scalar = this->getWidth();
+    memcpy(&data[i], &scalar, sizeof(scalar));
+    i += kSkScalarData32Cnt;
+
+    if (this->isDashed()) {
+        SkScalar phase = this->getDashPhase();
+        memcpy(&data[i], &phase, sizeof(phase));
+        i += kSkScalarData32Cnt;
+
+        int32_t count = this->getDashCount() & static_cast<int32_t>(~1);
+        SkASSERT(count == this->getDashCount());
+        const SkScalar* intervals = this->getDashIntervals();
+        int intervalByteCnt = count * sizeof(SkScalar);
+        memcpy(&data[i], intervals, intervalByteCnt);
+        // Enable the line below if fields are added after dashing.
+        SkDEBUGCODE(i += kSkScalarData32Cnt * count);
+    }
+
+    SkASSERT(this->computeUniqueKeyFragmentData32Cnt() == i);
+}