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389bc4b456
- fix dartdocs for addPerformanceOverlay - make PerformanceOverlayLayer honour its x, y, and height. - fix the y axis of PerformanceOverlayLayer to only show 3x16ms, since if it's more than 16ms it really doesn't matter what it is. - make the label on the PerformanceOverlayLayer show the worst time on record not the instantaneous time. - pin the fps to a maximum of 60Hz
88 lines
2.9 KiB
C++
88 lines
2.9 KiB
C++
// Copyright 2015 The Chromium Authors. All rights reserved.
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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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#include <string>
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#include <iostream>
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#include <iomanip>
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#include "flow/layers/performance_overlay_layer.h"
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namespace flow {
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PerformanceOverlayLayer::PerformanceOverlayLayer(uint64_t enabledOptions)
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: options_(enabledOptions) {
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}
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static void DrawStatisticsText(SkCanvas& canvas,
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const std::string& string,
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int x,
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int y) {
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SkPaint paint;
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paint.setTextSize(14);
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paint.setLinearText(false);
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paint.setColor(SK_ColorRED);
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canvas.drawText(string.c_str(), string.size(), x, y, paint);
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}
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static void VisualizeStopWatch(SkCanvas& canvas,
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const instrumentation::Stopwatch& stopwatch,
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SkScalar x,
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SkScalar y,
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SkScalar width,
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SkScalar height,
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bool show_graph,
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bool show_labels,
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std::string label_prefix) {
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const int labelX = 8; // distance from x
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const int labelY = -10; // distance from y+height
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if (show_graph) {
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SkRect visualizationRect = SkRect::MakeXYWH(x, y, width, height);
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stopwatch.visualize(canvas, visualizationRect);
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}
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if (show_labels) {
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double msPerFrame = stopwatch.maxDelta().InMillisecondsF();
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double fps;
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if (msPerFrame < instrumentation::kOneFrameMS) {
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fps = 1e3 / instrumentation::kOneFrameMS;
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} else {
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fps = 1e3 / msPerFrame;
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}
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std::stringstream stream;
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stream.setf(std::ios::fixed | std::ios::showpoint);
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stream << std::setprecision(1);
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stream << label_prefix << " " << fps << " fps "
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<< msPerFrame << "ms/frame";
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DrawStatisticsText(canvas, stream.str(), x + labelX, y + height + labelY);
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}
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}
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void PerformanceOverlayLayer::Paint(PaintContext::ScopedFrame& frame) {
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if (!options_) {
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return;
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}
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SkScalar x = paint_bounds().x();
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SkScalar y = paint_bounds().y();
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SkScalar width = paint_bounds().width();
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SkScalar height = paint_bounds().height() / 2;
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SkAutoCanvasRestore save(&frame.canvas(), true);
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VisualizeStopWatch(frame.canvas(), frame.context().frame_time(),
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x, y, width, height,
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options_ & kVisualizeRasterizerStatistics,
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options_ & kDisplayRasterizerStatistics,
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"Rasterizer");
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VisualizeStopWatch(frame.canvas(), frame.context().engine_time(),
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x, y + height, width, height,
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options_ & kVisualizeEngineStatistics,
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options_ & kDisplayEngineStatistics,
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"Engine");
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}
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} // namespace flow
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