Factor out DumpRecord method from dump_record tool for later use

tools/DumpRecord.cpp

+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include <stdio.h>
+
+#include "SkRecord.h"
+#include "SkRecordDraw.h"
+
+#include "BenchTimer.h"
+#include "DumpRecord.h"
+
+namespace {
+
+class Dumper {
+public:
+    explicit Dumper(SkCanvas* canvas, int count, bool timeWithCommand)
+        : fDigits(0)
+        , fIndent(0)
+        , fDraw(canvas)
+        , fTimeWithCommand(timeWithCommand) {
+        while (count > 0) {
+            count /= 10;
+            fDigits++;
+        }
+    }
+
+    unsigned index() const { return fDraw.index(); }
+    void next() { fDraw.next(); }
+
+    template <typename T>
+    void operator()(const T& command) {
+        BenchTimer timer;
+        timer.start();
+            fDraw(command);
+        timer.end();
+
+        this->print(command, timer.fCpu);
+    }
+
+    void operator()(const SkRecords::NoOp&) {
+        // Move on without printing anything.
+    }
+
+    template <typename T>
+    void print(const T& command, double time) {
+        this->printNameAndTime(command, time);
+    }
+
+    void print(const SkRecords::Restore& command, double time) {
+        --fIndent;
+        this->printNameAndTime(command, time);
+    }
+
+    void print(const SkRecords::Save& command, double time) {
+        this->printNameAndTime(command, time);
+        ++fIndent;
+    }
+
+    void print(const SkRecords::SaveLayer& command, double time) {
+        this->printNameAndTime(command, time);
+        ++fIndent;
+    }
+
+private:
+    template <typename T>
+    void printNameAndTime(const T& command, double time) {
+        if (!fTimeWithCommand) {
+            printf("%6.1f ", time * 1000);
+        }
+        printf("%*d ", fDigits, fDraw.index());
+        for (int i = 0; i < fIndent; i++) {
+            putchar('\t');
+        }
+        if (fTimeWithCommand) {
+            printf("%6.1f ", time * 1000);
+        }
+        puts(NameOf(command));
+    }
+
+    template <typename T>
+    static const char* NameOf(const T&) {
+    #define CASE(U) case SkRecords::U##_Type: return #U;
+        switch(T::kType) { SK_RECORD_TYPES(CASE); }
+    #undef CASE
+        SkDEBUGFAIL("Unknown T");
+        return "Unknown T";
+    }
+
+    static const char* NameOf(const SkRecords::SaveLayer&) {
+        return "\x1b[31;1mSaveLayer\x1b[0m";  // Bold red.
+    }
+
+    int fDigits;
+    int fIndent;
+    SkRecords::Draw fDraw;
+    const bool fTimeWithCommand;
+};
+
+}  // namespace
+
+void DumpRecord(const SkRecord& record,
+                  SkCanvas* canvas,
+                  bool timeWithCommand) {
+    for (Dumper dumper(canvas, record.count(), timeWithCommand);
+         dumper.index() < record.count();
+         dumper.next()) {
+        record.visit<void>(dumper.index(), dumper);
+    }
+}