Add a bench for picture playback.

Review URL: https://codereview.appspot.com/5694053

git-svn-id: http://skia.googlecode.com/svn/trunk@3245 2bbb7eff-a529-9590-31e7-b0007b416f81

bench/PicturePlaybackBench.cpp

@@ -0,0 +1,147 @@
+/*
+ * Copyright 2011 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+#include "SkBenchmark.h"
+#include "SkCanvas.h"
+#include "SkColor.h"
+#include "SkPaint.h"
+#include "SkPicture.h"
+#include "SkPoint.h"
+#include "SkRect.h"
+#include "SkString.h"
+
+// This is designed to emulate about 4 screens of textual content
+
+
+class PicturePlaybackBench : public SkBenchmark {
+public:
+    PicturePlaybackBench(void* param, const char name[]) : INHERITED(param) {
+        fName.printf("picture_playback_%s", name);
+        fPictureWidth = SkIntToScalar(PICTURE_WIDTH);
+        fPictureHeight = SkIntToScalar(PICTURE_HEIGHT);
+        fTextSize = SkIntToScalar(TEXT_SIZE);
+    }
+
+    enum {
+        N = SkBENCHLOOP(1000),   // number of times to playback the picture
+        PICTURE_WIDTH = 1000,
+        PICTURE_HEIGHT = 4000,
+        TEXT_SIZE = 10
+    };
+protected:
+    virtual const char* onGetName() {
+        return fName.c_str();
+    }
+
+    virtual void onDraw(SkCanvas* canvas) {
+
+        SkPicture picture;
+
+        SkCanvas* pCanvas = picture.beginRecording(PICTURE_WIDTH, PICTURE_HEIGHT);
+        recordCanvas(pCanvas);
+        picture.endRecording();
+
+        const SkPoint translateDelta = getTranslateDelta();
+
+        for (int i = 0; i < N; i++) {
+            picture.draw(canvas);
+            canvas->translate(translateDelta.fX, translateDelta.fY);
+        }
+    }
+
+    virtual void recordCanvas(SkCanvas* canvas) = 0;
+    virtual SkPoint getTranslateDelta() {
+        SkIPoint canvasSize = onGetSize();
+        return SkPoint::Make(SkIntToScalar((PICTURE_WIDTH - canvasSize.fX)/N),
+                             SkIntToScalar((PICTURE_HEIGHT- canvasSize.fY)/N));
+    }
+
+    SkString fName;
+    SkScalar fPictureWidth;
+    SkScalar fPictureHeight;
+    SkScalar fTextSize;
+private:
+    typedef SkBenchmark INHERITED;
+};
+
+
+class TextPlaybackBench : public PicturePlaybackBench {
+public:
+    TextPlaybackBench(void* param) : INHERITED(param, "drawText") { }
+protected:
+    virtual void recordCanvas(SkCanvas* canvas) {
+        SkPaint paint;
+        paint.setTextSize(fTextSize);
+        paint.setColor(SK_ColorBLACK);
+
+        const char* text = "Hamburgefons";
+        size_t len = strlen(text);
+        const SkScalar textWidth = paint.measureText(text, len);
+
+        for (SkScalar x = 0; x < fPictureWidth; x += textWidth) {
+            for (SkScalar y = 0; y < fPictureHeight; y += fTextSize) {
+                canvas->drawText(text, len, x, y, paint);
+            }
+        }
+    }
+private:
+    typedef PicturePlaybackBench INHERITED;
+};
+
+class PosTextPlaybackBench : public PicturePlaybackBench {
+public:
+    PosTextPlaybackBench(void* param, bool drawPosH)
+        : fDrawPosH(drawPosH)
+        , INHERITED(param, drawPosH ? "drawPosTextH" : "drawPosText") { }
+protected:
+    virtual void recordCanvas(SkCanvas* canvas) {
+        SkPaint paint;
+        paint.setTextSize(fTextSize);
+        paint.setColor(SK_ColorBLACK);
+
+        const char* text = "Hamburgefons";
+        size_t len = strlen(text);
+        const SkScalar textWidth = paint.measureText(text, len);
+
+        SkScalar* adv = new SkScalar[len];
+        paint.getTextWidths(text, len, adv);
+
+        for (SkScalar x = 0; x < fPictureWidth; x += textWidth) {
+            for (SkScalar y = 0; y < fPictureHeight; y += fTextSize) {
+
+                SkPoint* pos = new SkPoint[len];
+                SkScalar advX = 0;
+
+                for (size_t i = 0; i < len; i++) {
+                    if (fDrawPosH)
+                        pos[i].set(x + advX, y);
+                    else
+                        pos[i].set(x + advX, y + SkIntToScalar(i));
+                    advX += adv[i];
+                }
+
+                canvas->drawPosText(text, len, pos, paint);
+                delete[] pos;
+            }
+        }
+        delete[] adv;
+    }
+private:
+    bool fDrawPosH;
+    typedef PicturePlaybackBench INHERITED;
+};
+
+
+///////////////////////////////////////////////////////////////////////////////
+
+static SkBenchmark* Fact0(void* p) { return new TextPlaybackBench(p); }
+static SkBenchmark* Fact1(void* p) { return new PosTextPlaybackBench(p, true); }
+static SkBenchmark* Fact2(void* p) { return new PosTextPlaybackBench(p, false); }
+
+static BenchRegistry gReg0(Fact0);
+static BenchRegistry gReg1(Fact1);
+static BenchRegistry gReg2(Fact2);
+

gyp/bench.gypi

@@ -28,6 +28,7 @@
     '../bench/MatrixBench.cpp',
     '../bench/MutexBench.cpp',
     '../bench/PathBench.cpp',
+    '../bench/PicturePlaybackBench.cpp',
     '../bench/RectBench.cpp',
     '../bench/RepeatTileBench.cpp',
     '../bench/ScalarBench.cpp',