93 lines
3.2 KiB
C++
93 lines
3.2 KiB
C++
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/*
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* Copyright 2020 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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#include "include/core/SkCanvas.h"
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#include "include/core/SkFont.h"
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#include "include/core/SkSurface.h"
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#include "samplecode/Sample.h"
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#include <chrono>
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struct TimingSample : public Sample {
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static constexpr int W = 24,
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H = 16;
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sk_sp<SkImage> fImg;
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SkString name() override { return SkString("Timing"); }
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void onOnceBeforeDraw() override {
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sk_sp<SkSurface> surf = SkSurface::MakeRasterN32Premul(W,H);
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surf->getCanvas()->drawString("abc", 2,H-4, SkFont{}, SkPaint{});
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fImg = surf->makeImageSnapshot();
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}
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void onDrawContent(SkCanvas* canvas) override {
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canvas->scale(8,8);
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// Draw normally.
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canvas->drawImage(fImg, 0,0);
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canvas->translate(0,H);
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// Draw one pixel at a time with drawImageRect(),
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// timing how long each drawImageRect() call takes.
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double cost[H][W];
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double min = +INFINITY,
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max = -INFINITY;
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for (int y = 0; y < H; y++)
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for (int x = 0; x < W; x++) {
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auto start = std::chrono::steady_clock::now();
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canvas->drawImageRect(fImg, SkRect::MakeXYWH(x,y,1,1)
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, SkRect::MakeXYWH(x,y,1,1)
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, /*paint=*/nullptr);
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auto elapsed = std::chrono::steady_clock::now() - start;
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cost[y][x] = elapsed.count();
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min = std::min(min, cost[y][x]);
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max = std::max(max, cost[y][x]);
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}
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canvas->translate(0,H);
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// Draw using those per-pixel timings,
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// with the slowest pixel scaled to alpha=1, the fastest to alpha=0.
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for (int y = 0; y < H; y++)
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for (int x = 0; x < W; x++) {
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SkPaint p;
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p.setAlphaf( (cost[y][x] - min) / (max - min) );
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canvas->drawRect(SkRect::MakeXYWH(x,y,1,1), p);
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}
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canvas->translate(0,H);
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// Draw each pixel into offscreen, timing each draw.
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SkImageInfo info = canvas->imageInfo().makeWH(1024,1024);
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if (sk_sp<SkSurface> offscreen = canvas->makeSurface(info)) {
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min = +INFINITY;
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max = -INFINITY;
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for (int y = 0; y < H; y++)
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for (int x = 0; x < W; x++) {
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auto start = std::chrono::steady_clock::now();
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offscreen->getCanvas()->drawImageRect(fImg, SkRect::MakeXYWH(x,y,1,1)
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, SkRect::MakeXYWH(0,0,1024,1024)
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, /*paint=*/nullptr);
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auto elapsed = std::chrono::steady_clock::now() - start;
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cost[y][x] = elapsed.count();
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min = std::min(min, cost[y][x]);
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max = std::max(max, cost[y][x]);
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}
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for (int y = 0; y < H; y++)
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for (int x = 0; x < W; x++) {
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SkPaint p;
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p.setAlphaf( (cost[y][x] - min) / (max - min) );
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canvas->drawRect(SkRect::MakeXYWH(x,y,1,1), p);
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}
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}
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}
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};
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DEF_SAMPLE( return new TimingSample; )
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