bench/DeferredSurfaceCopyBench.cpp

   1
   2 /*
   3  * Copyright 2013 Google Inc.
   4  *
   5  * Use of this source code is governed by a BSD-style license that can be
   6  * found in the LICENSE file.
   7  */
   8
   9 #include "Benchmark.h"
  10 #include "SkDeferredCanvas.h"
  11 #include "SkDevice.h"
  12 #include "SkImage.h"
  13 #include "SkSurface.h"
  14 #if SK_SUPPORT_GPU
  15 #include "GrRenderTarget.h"
  16 #endif
  17
  18 class DeferredSurfaceCopyBench : public Benchmark {
  19     enum {
  20         kSurfaceWidth = 1000,
  21         kSurfaceHeight = 1000,
  22     };
  23 public:
  24     DeferredSurfaceCopyBench(bool discardableContents) {
  25         fDiscardableContents = discardableContents;
  26     }
  27
  28 protected:
  29     const char* onGetName() SK_OVERRIDE {
  30         return fDiscardableContents ? "DeferredSurfaceCopy_discardable" :
  31             "DeferredSurfaceCopy_nonDiscardable";
  32     }
  33
  34     void onDraw(const int loops, SkCanvas* canvas) SK_OVERRIDE {
  35         // The canvas is not actually used for this test except to provide
  36         // configuration information: gpu, multisampling, size, etc?
  37         SkImageInfo info = SkImageInfo::MakeN32Premul(kSurfaceWidth, kSurfaceHeight);
  38         const SkRect fullCanvasRect = SkRect::MakeWH(
  39             SkIntToScalar(kSurfaceWidth), SkIntToScalar(kSurfaceHeight));
  40         SkAutoTUnref<SkSurface> surface(canvas->newSurface(info));
  41
  42         // newSurface() can return NULL for several reasons, so we need to check
  43         if (NULL == surface.get()) {
  44             SkDebugf("DeferredSurfaceCopyBench newSurface failed, bench results are meaningless\n");
  45             return; // should we signal the caller that we hit an error?
  46         }
  47
  48         SkAutoTUnref<SkDeferredCanvas> drawingCanvas(SkDeferredCanvas::Create(surface));
  49
  50         for (int iteration = 0; iteration < loops; iteration++) {
  51             drawingCanvas->clear(0);
  52             SkAutoTUnref<SkImage> image(drawingCanvas->newImageSnapshot());
  53             SkPaint paint;
  54             if (!fDiscardableContents) {
  55                 // If paint is not opaque, prior canvas contents are
  56                 // not discardable because they are needed for compositing.
  57                 paint.setAlpha(127);
  58             }
  59             drawingCanvas->drawRect(fullCanvasRect, paint);
  60             // Trigger copy on write, which should be faster in the discardable case.
  61             drawingCanvas->flush();
  62         }
  63     }
  64
  65 private:
  66     bool fDiscardableContents;
  67
  68     typedef Benchmark INHERITED;
  69 };
  70
  71 //////////////////////////////////////////////////////////////////////////////
  72
  73 DEF_BENCH( return new DeferredSurfaceCopyBench(false); )
  74 DEF_BENCH( return new DeferredSurfaceCopyBench(true); )