Augmenting SkDeferredCanvas notification interface to signal flushes and memory allocations
Renamed SkDeferredCanvas::DeviceContext to SkDeferredCanvas::NotificationClient
BUG=http://code.google.com/p/chromium/issues/detail?id=136828
TEST=Added coverage for new API to DeferredCanvas unit test. Added DeferredCanvas bench test to track deferred canvas overhead cost.
Review URL: https://codereview.appspot.com/6442108
git-svn-id: http://skia.googlecode.com/svn/trunk@5078 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/bench/DeferredCanvasBench.cpp b/bench/DeferredCanvasBench.cpp
new file mode 100644
index 0000000..6087388
--- /dev/null
+++ b/bench/DeferredCanvasBench.cpp
@@ -0,0 +1,107 @@
+/*
+ * 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 "SkBenchmark.h"
+#include "SkDeferredCanvas.h"
+#include "SkDevice.h"
+#include "SkString.h"
+
+class DeferredCanvasBench : public SkBenchmark {
+public:
+ DeferredCanvasBench(void* param, const char name[]) : INHERITED(param) {
+ fName.printf("deferred_canvas_%s", name);
+ }
+
+ enum {
+ N = SkBENCHLOOP(25), // number of times to create the picture
+ CANVAS_WIDTH = 200,
+ CANVAS_HEIGHT = 200,
+ };
+protected:
+ virtual const char* onGetName() {
+ return fName.c_str();
+ }
+
+ virtual void onDraw(SkCanvas* canvas) {
+ SkDeferredCanvas deferredCanvas(canvas->getDevice()->createCompatibleDevice(
+ SkBitmap::kARGB_8888_Config, CANVAS_WIDTH, CANVAS_HEIGHT, false));
+
+ initDeferredCanvas(deferredCanvas);
+
+ for (int i = 0; i < N; i++) {
+ drawInDeferredCanvas(deferredCanvas);
+ }
+
+ finalizeDeferredCanvas(deferredCanvas);
+ deferredCanvas.flush();
+ }
+
+ virtual void initDeferredCanvas(SkDeferredCanvas& canvas) = 0;
+ virtual void drawInDeferredCanvas(SkDeferredCanvas& canvas) = 0;
+ virtual void finalizeDeferredCanvas(SkDeferredCanvas& canvas) = 0;
+
+ SkString fName;
+
+private:
+ typedef SkBenchmark INHERITED;
+};
+
+class SimpleNotificationClient : public SkDeferredCanvas::NotificationClient {
+public:
+ SimpleNotificationClient() : fDummy(false) {}
+
+ //bogus virtual implementations that just do something small
+ virtual void prepareForDraw() SK_OVERRIDE {fDummy = true;}
+ virtual void storageAllocatedForRecordingChanged(size_t) SK_OVERRIDE {fDummy = false;}
+ virtual void flushedDrawCommands() SK_OVERRIDE {fDummy = !fDummy;}
+private:
+ bool fDummy;
+};
+
+// Test that records very simple draw operations.
+// This benchmark aims to capture performance fluctuations in the recording
+// overhead of SkDeferredCanvas
+class DeferredRecordBench : public DeferredCanvasBench {
+public:
+ DeferredRecordBench(void* param)
+ : INHERITED(param, "record") {
+ }
+
+ enum {
+ M = SkBENCHLOOP(700), // number of individual draws in each loop
+ };
+protected:
+
+ virtual void initDeferredCanvas(SkDeferredCanvas& canvas) SK_OVERRIDE {
+ canvas.setNotificationClient(SkNEW(SimpleNotificationClient))->unref();
+ }
+
+ virtual void drawInDeferredCanvas(SkDeferredCanvas& canvas) SK_OVERRIDE {
+ SkRect rect;
+ rect.setXYWH(0, 0, 10, 10);
+ SkPaint paint;
+ for (int i = 0; i < M; i++) {
+ canvas.save(SkCanvas::kMatrixClip_SaveFlag);
+ canvas.translate(SkIntToScalar(i * 27 % CANVAS_WIDTH), SkIntToScalar(i * 13 % CANVAS_HEIGHT));
+ canvas.drawRect(rect, paint);
+ canvas.restore();
+ }
+ }
+
+ virtual void finalizeDeferredCanvas(SkDeferredCanvas& canvas) SK_OVERRIDE {
+ canvas.clear(0x0);
+ }
+
+private:
+ typedef DeferredCanvasBench INHERITED;
+};
+
+
+///////////////////////////////////////////////////////////////////////////////
+
+static SkBenchmark* Fact0(void* p) { return new DeferredRecordBench(p); }
+
+static BenchRegistry gReg0(Fact0);