SkPdf: smaller color serialization

bench/PDFBench.cpp

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "Benchmark.h"
 #include "Resources.h"
 #include "SkAutoPixmapStorage.h"
@@ skipping 146 matching lines @@
     void onDraw(int loops, SkCanvas*) override {
         SkRandom random;
         char dst[SkPDFUtils::kMaximumFloatDecimalLength];
         while (loops-- > 0) {
             auto f = random.nextRangeF(-500.0f, 1500.0f);
             (void)SkPDFUtils::FloatToDecimal(f, dst);
         }
     }
 };
 
+struct PDFColorComponentBench : public Benchmark {
+    bool isSuitableFor(Backend b) override {
+        return b == kNonRendering_Backend;
+    }
+    const char* onGetName() override { return "PDFColorComponent"; }
+    void onDraw(int loops, SkCanvas*) override {
+        char dst[5];
+        while (loops-- > 0) {
+            for (int i = 0; i < 256; ++i) {
+                (void)SkPDFUtils::ColorToDecimal(SkToU8(i), dst);
+            }
+        }
+    }
+};
+
 struct PDFShaderBench : public Benchmark {
     sk_sp<SkShader> fShader;
     const char* onGetName() final { return "PDFShader"; }
     bool isSuitableFor(Backend b) final { return b == kNonRendering_Backend; }
     void onDelayedSetup() final {
         const SkPoint pts[2] = {{0.0f, 0.0f}, {100.0f, 100.0f}};
         const SkColor colors[] = {
             SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE,
             SK_ColorWHITE, SK_ColorBLACK,
         };
@@ skipping 48 matching lines @@
             }
         }
     }
 };
 
 }  // namespace
 DEF_BENCH(return new PDFImageBench;)
 DEF_BENCH(return new PDFJpegImageBench;)
 DEF_BENCH(return new PDFCompressionBench;)
 DEF_BENCH(return new PDFScalarBench;)
+DEF_BENCH(return new PDFColorComponentBench;)
 DEF_BENCH(return new PDFShaderBench;)
 DEF_BENCH(return new WStreamWriteTextBenchmark;)
 DEF_BENCH(return new WritePDFTextBenchmark;)