00b621cfc0
This should be a drop-in replacement for most for-loops to make them run in parallel:
for (int i = 0; i < N; i++) { code... }
~~~>
sk_parallel_for(N, [&](int i) { code... });
This is just syntax sugar over SkTaskGroup to make this use case really easy to write.
There's no more overhead that we weren't already forced to add using an interface like batch(),
and no extra heap allocations.
I've replaced 3 uses of SkTaskGroup with sk_parallel_for:
1) My unit tests for SkOnce.
2) Cary's path fuzzer.
3) SkMultiPictureDraw.
Performance should be the same. Please compare left and right for readability. :)
BUG=skia:
No public API changes.
TBR=reed@google.com
Review URL: https://codereview.chromium.org/1184373003
76 lines
2.1 KiB
C++
76 lines
2.1 KiB
C++
/*
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* Copyright 2014 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkMultiPictureDraw_DEFINED
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#define SkMultiPictureDraw_DEFINED
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#include "SkMatrix.h"
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#include "SkTDArray.h"
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class SkCanvas;
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class SkPaint;
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class SkPicture;
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/** \class SkMultiPictureDraw
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The MultiPictureDraw object accepts several picture/canvas pairs and
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then attempts to optimally draw the pictures into the canvases, sharing
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as many resources as possible.
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*/
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class SK_API SkMultiPictureDraw {
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public:
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/**
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* Create an object to optimize the drawing of multiple pictures.
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* @param reserve Hint for the number of add calls expected to be issued
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*/
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SkMultiPictureDraw(int reserve = 0);
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~SkMultiPictureDraw() { this->reset(); }
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/**
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* Add a canvas/picture pair for later rendering.
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* @param canvas the canvas in which to draw picture
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* @param picture the picture to draw into canvas
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* @param matrix if non-NULL, applied to the CTM when drawing
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* @param paint if non-NULL, draw picture to a temporary buffer
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* and then apply the paint when the result is drawn
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*/
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void add(SkCanvas* canvas,
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const SkPicture* picture,
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const SkMatrix* matrix = NULL,
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const SkPaint* paint = NULL);
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/**
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* Perform all the previously added draws. This will reset the state
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* of this object. If flush is true, all canvases are flushed after
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* draw.
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*/
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void draw(bool flush = false);
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/**
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* Abandon all buffered draws and reset to the initial state.
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*/
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void reset();
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private:
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struct DrawData {
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SkCanvas* fCanvas; // reffed
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const SkPicture* fPicture; // reffed
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SkMatrix fMatrix;
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SkPaint* fPaint; // owned
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void init(SkCanvas*, const SkPicture*, const SkMatrix*, const SkPaint*);
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void draw();
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static void Reset(SkTDArray<DrawData>&);
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};
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SkTDArray<DrawData> fThreadSafeDrawData;
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SkTDArray<DrawData> fGPUDrawData;
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};
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#endif
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