ui/src/tracks/chrome_slices/frontend.ts - third_party/perfetto - Git at Google

 // Copyright (C) 2018 The Android Open Source Project
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //      http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.

 import {Actions} from '../../common/actions';
 import {cropText, drawIncompleteSlice} from '../../common/canvas_utils';
 import {hueForSlice} from '../../common/colorizer';
 import {TrackState} from '../../common/state';
 import {toNs} from '../../common/time';
 import {checkerboardExcept} from '../../frontend/checkerboard';
 import {globals} from '../../frontend/globals';
 import {SliceRect, Track} from '../../frontend/track';
 import {trackRegistry} from '../../frontend/track_registry';

 import {Config, Data, SLICE_TRACK_KIND} from './common';

 const SLICE_HEIGHT = 18;
 const TRACK_PADDING = 4;
 const INCOMPLETE_SLICE_TIME_S = 0.00003;
 const CHEVRON_WIDTH_PX = 10;
 const HALF_CHEVRON_WIDTH_PX = CHEVRON_WIDTH_PX / 2;

 export class ChromeSliceTrack extends Track<Config, Data> {
   static readonly kind: string = SLICE_TRACK_KIND;
   static create(trackState: TrackState): Track {
     return new ChromeSliceTrack(trackState);
   }

   private hoveredTitleId = -1;

   constructor(trackState: TrackState) {
     super(trackState);
   }

   renderCanvas(ctx: CanvasRenderingContext2D): void {
     // TODO: fonts and colors should come from the CSS and not hardcoded here.

     const {timeScale, visibleWindowTime} = globals.frontendLocalState;
     const data = this.data();

     if (data === undefined) return;  // Can't possibly draw anything.

     // If the cached trace slices don't fully cover the visible time range,
     // show a gray rectangle with a "Loading..." label.
     checkerboardExcept(
         ctx,
         this.getHeight(),
         timeScale.timeToPx(visibleWindowTime.start),
         timeScale.timeToPx(visibleWindowTime.end),
         timeScale.timeToPx(data.start),
         timeScale.timeToPx(data.end),
     );

     ctx.font = '12px Roboto Condensed';
     ctx.textAlign = 'center';

     // measuretext is expensive so we only use it once.
     const charWidth = ctx.measureText('ACBDLqsdfg').width / 10;

     // The draw of the rect on the selected slice must happen after the other
     // drawings, otherwise it would result under another rect.
     let drawRectOnSelected = () => {};

     for (let i = 0; i < data.starts.length; i++) {
       const tStart = data.starts[i];
       let tEnd = data.ends[i];
       const depth = data.depths[i];
       const titleId = data.titles[i];
       const sliceId = data.sliceIds[i];
       const isInstant = data.isInstant[i];
       const title = data.strings[titleId];
       let incompleteSlice = false;
       if (toNs(tEnd) - toNs(tStart) === -1) {  // incomplete slice
         incompleteSlice = true;
         tEnd = tStart + INCOMPLETE_SLICE_TIME_S;
       }

       const rect = this.getSliceRect(tStart, tEnd, depth);
       if (!rect || !rect.visible) {
         continue;
       }

       const currentSelection = globals.state.currentSelection;
       const isSelected = currentSelection &&
           currentSelection.kind === 'CHROME_SLICE' &&
           currentSelection.id !== undefined && currentSelection.id === sliceId;

       const name = title.replace(/( )?\d+/g, '');
       const hue = hueForSlice(name);
       const saturation = isSelected ? 80 : 50;
       const hovered = titleId === this.hoveredTitleId;
       const color = `hsl(${hue}, ${saturation}%, ${hovered ? 30 : 65}%)`;

       ctx.fillStyle = color;

       // We draw instant events as upward facing chevrons starting at A:
       //     A
       //    ###
       //   ##C##
       //  ##   ##
       // D       B
       // Then B, C, D and back to A:
       if (isInstant) {
         ctx.moveTo(rect.left, rect.top);
         ctx.lineTo(rect.left + HALF_CHEVRON_WIDTH_PX, rect.top + SLICE_HEIGHT);
         ctx.lineTo(rect.left, rect.top + SLICE_HEIGHT - HALF_CHEVRON_WIDTH_PX);
         ctx.lineTo(rect.left - HALF_CHEVRON_WIDTH_PX, rect.top + SLICE_HEIGHT);
         ctx.lineTo(rect.left, rect.top);
         ctx.fill();
         continue;
       }
       if (incompleteSlice && rect.width > SLICE_HEIGHT / 4) {
         drawIncompleteSlice(
             ctx, rect.left, rect.top, rect.width, SLICE_HEIGHT, color);
       } else {
         ctx.fillRect(rect.left, rect.top, rect.width, SLICE_HEIGHT);
       }
       // Selected case
       if (isSelected) {
         drawRectOnSelected = () => {
           ctx.strokeStyle = `hsl(${hue}, ${saturation}%, 30%)`;
           ctx.beginPath();
           ctx.lineWidth = 3;
           ctx.strokeRect(
               rect.left, rect.top - 1.5, rect.width, SLICE_HEIGHT + 3);
           ctx.closePath();
         };
       }

       ctx.fillStyle = 'white';
       const displayText = cropText(title, charWidth, rect.width);
       const rectXCenter = rect.left + rect.width / 2;
       ctx.textBaseline = "middle";
       ctx.fillText(displayText, rectXCenter, rect.top + SLICE_HEIGHT / 2);
     }
     drawRectOnSelected();
   }

   getSliceIndex({x, y}: {x: number, y: number}): number|void {
     const data = this.data();
     this.hoveredTitleId = -1;
     if (data === undefined) return;
     const {timeScale} = globals.frontendLocalState;
     if (y < TRACK_PADDING) return;
     const instantWidthTime = timeScale.deltaPxToDuration(HALF_CHEVRON_WIDTH_PX);
     const t = timeScale.pxToTime(x);
     const depth = Math.floor(y / SLICE_HEIGHT);
     for (let i = 0; i < data.starts.length; i++) {
       if (depth !== data.depths[i]) {
         continue;
       }
       const tStart = data.starts[i];
       if (data.isInstant[i]) {
         if (Math.abs(tStart - t) < instantWidthTime) {
           return i;
         }
       } else {
         let tEnd = data.ends[i];
         if (toNs(tEnd) - toNs(tStart) === -1) {
           tEnd = tStart + INCOMPLETE_SLICE_TIME_S;
         }
         if (tStart <= t && t <= tEnd) {
           return i;
         }
       }
     }
   }

   onMouseMove({x, y}: {x: number, y: number}) {
     const sliceIndex = this.getSliceIndex({x, y});
     if (sliceIndex === undefined) return;
     const data = this.data();
     if (data === undefined) return;
     const titleId = data.titles[sliceIndex];
     this.hoveredTitleId = titleId;
   }

   onMouseOut() {
     this.hoveredTitleId = -1;
   }

   onMouseClick({x, y}: {x: number, y: number}): boolean {
     const sliceIndex = this.getSliceIndex({x, y});
     if (sliceIndex === undefined) return false;
     const data = this.data();
     if (data === undefined) return false;
     const sliceId = data.sliceIds[sliceIndex];
     if (sliceId !== undefined && sliceId !== -1) {
       globals.makeSelection(Actions.selectChromeSlice({
         id: sliceId,
         trackId: this.trackState.id,
         table: this.config.namespace
       }));
       return true;
     }
     return false;
   }

   getHeight() {
     return SLICE_HEIGHT * (this.config.maxDepth + 1) + 2 * TRACK_PADDING;
   }

   getSliceRect(tStart: number, tEnd: number, depth: number): SliceRect
       |undefined {
     const {timeScale, visibleWindowTime} = globals.frontendLocalState;
     const pxEnd = timeScale.timeToPx(visibleWindowTime.end);
     const left = Math.max(timeScale.timeToPx(tStart), 0);
     const right = Math.min(timeScale.timeToPx(tEnd), pxEnd);
     return {
       left,
       width: Math.max(right - left, 1),
       top: TRACK_PADDING + depth * SLICE_HEIGHT,
       height: SLICE_HEIGHT,
       visible:
           !(tEnd <= visibleWindowTime.start || tStart >= visibleWindowTime.end)
     };
   }
 }

 trackRegistry.register(ChromeSliceTrack);
	// Copyright (C) 2018 The Android Open Source Project
	//
	// Licensed under the Apache License, Version 2.0 (the "License");
	// you may not use this file except in compliance with the License.
	// You may obtain a copy of the License at
	//
	// http://www.apache.org/licenses/LICENSE-2.0
	//
	// Unless required by applicable law or agreed to in writing, software
	// distributed under the License is distributed on an "AS IS" BASIS,
	// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	// See the License for the specific language governing permissions and
	// limitations under the License.

	import {Actions} from '../../common/actions';
	import {cropText, drawIncompleteSlice} from '../../common/canvas_utils';
	import {hueForSlice} from '../../common/colorizer';
	import {TrackState} from '../../common/state';
	import {toNs} from '../../common/time';
	import {checkerboardExcept} from '../../frontend/checkerboard';
	import {globals} from '../../frontend/globals';
	import {SliceRect, Track} from '../../frontend/track';
	import {trackRegistry} from '../../frontend/track_registry';

	import {Config, Data, SLICE_TRACK_KIND} from './common';

	const SLICE_HEIGHT = 18;
	const TRACK_PADDING = 4;
	const INCOMPLETE_SLICE_TIME_S = 0.00003;
	const CHEVRON_WIDTH_PX = 10;
	const HALF_CHEVRON_WIDTH_PX = CHEVRON_WIDTH_PX / 2;

	export class ChromeSliceTrack extends Track<Config, Data> {
	static readonly kind: string = SLICE_TRACK_KIND;
	static create(trackState: TrackState): Track {
	return new ChromeSliceTrack(trackState);
	}

	private hoveredTitleId = -1;

	constructor(trackState: TrackState) {
	super(trackState);
	}

	renderCanvas(ctx: CanvasRenderingContext2D): void {
	// TODO: fonts and colors should come from the CSS and not hardcoded here.

	const {timeScale, visibleWindowTime} = globals.frontendLocalState;
	const data = this.data();

	if (data === undefined) return; // Can't possibly draw anything.

	// If the cached trace slices don't fully cover the visible time range,
	// show a gray rectangle with a "Loading..." label.
	checkerboardExcept(
	ctx,
	this.getHeight(),
	timeScale.timeToPx(visibleWindowTime.start),
	timeScale.timeToPx(visibleWindowTime.end),
	timeScale.timeToPx(data.start),
	timeScale.timeToPx(data.end),
	);

	ctx.font = '12px Roboto Condensed';
	ctx.textAlign = 'center';

	// measuretext is expensive so we only use it once.
	const charWidth = ctx.measureText('ACBDLqsdfg').width / 10;

	// The draw of the rect on the selected slice must happen after the other
	// drawings, otherwise it would result under another rect.
	let drawRectOnSelected = () => {};

	for (let i = 0; i < data.starts.length; i++) {
	const tStart = data.starts[i];
	let tEnd = data.ends[i];
	const depth = data.depths[i];
	const titleId = data.titles[i];
	const sliceId = data.sliceIds[i];
	const isInstant = data.isInstant[i];
	const title = data.strings[titleId];
	let incompleteSlice = false;
	if (toNs(tEnd) - toNs(tStart) === -1) { // incomplete slice
	incompleteSlice = true;
	tEnd = tStart + INCOMPLETE_SLICE_TIME_S;
	}

	const rect = this.getSliceRect(tStart, tEnd, depth);
	if (!rect \|\| !rect.visible) {
	continue;
	}

	const currentSelection = globals.state.currentSelection;
	const isSelected = currentSelection &&
	currentSelection.kind === 'CHROME_SLICE' &&
	currentSelection.id !== undefined && currentSelection.id === sliceId;

	const name = title.replace(/( )?\d+/g, '');
	const hue = hueForSlice(name);
	const saturation = isSelected ? 80 : 50;
	const hovered = titleId === this.hoveredTitleId;
	const color = `hsl(${hue}, ${saturation}%, ${hovered ? 30 : 65}%)`;

	ctx.fillStyle = color;

	// We draw instant events as upward facing chevrons starting at A:
	// A
	// ###
	// ##C##
	// ## ##
	// D B
	// Then B, C, D and back to A:
	if (isInstant) {
	ctx.moveTo(rect.left, rect.top);
	ctx.lineTo(rect.left + HALF_CHEVRON_WIDTH_PX, rect.top + SLICE_HEIGHT);
	ctx.lineTo(rect.left, rect.top + SLICE_HEIGHT - HALF_CHEVRON_WIDTH_PX);
	ctx.lineTo(rect.left - HALF_CHEVRON_WIDTH_PX, rect.top + SLICE_HEIGHT);
	ctx.lineTo(rect.left, rect.top);
	ctx.fill();
	continue;
	}
	if (incompleteSlice && rect.width > SLICE_HEIGHT / 4) {
	drawIncompleteSlice(
	ctx, rect.left, rect.top, rect.width, SLICE_HEIGHT, color);
	} else {
	ctx.fillRect(rect.left, rect.top, rect.width, SLICE_HEIGHT);
	}
	// Selected case
	if (isSelected) {
	drawRectOnSelected = () => {
	ctx.strokeStyle = `hsl(${hue}, ${saturation}%, 30%)`;
	ctx.beginPath();
	ctx.lineWidth = 3;
	ctx.strokeRect(
	rect.left, rect.top - 1.5, rect.width, SLICE_HEIGHT + 3);
	ctx.closePath();
	};
	}

	ctx.fillStyle = 'white';
	const displayText = cropText(title, charWidth, rect.width);
	const rectXCenter = rect.left + rect.width / 2;
	ctx.textBaseline = "middle";
	ctx.fillText(displayText, rectXCenter, rect.top + SLICE_HEIGHT / 2);
	}
	drawRectOnSelected();
	}

	getSliceIndex({x, y}: {x: number, y: number}): number\|void {
	const data = this.data();
	this.hoveredTitleId = -1;
	if (data === undefined) return;
	const {timeScale} = globals.frontendLocalState;
	if (y < TRACK_PADDING) return;
	const instantWidthTime = timeScale.deltaPxToDuration(HALF_CHEVRON_WIDTH_PX);
	const t = timeScale.pxToTime(x);
	const depth = Math.floor(y / SLICE_HEIGHT);
	for (let i = 0; i < data.starts.length; i++) {
	if (depth !== data.depths[i]) {
	continue;
	}
	const tStart = data.starts[i];
	if (data.isInstant[i]) {
	if (Math.abs(tStart - t) < instantWidthTime) {
	return i;
	}
	} else {
	let tEnd = data.ends[i];
	if (toNs(tEnd) - toNs(tStart) === -1) {
	tEnd = tStart + INCOMPLETE_SLICE_TIME_S;
	}
	if (tStart <= t && t <= tEnd) {
	return i;
	}
	}
	}
	}

	onMouseMove({x, y}: {x: number, y: number}) {
	const sliceIndex = this.getSliceIndex({x, y});
	if (sliceIndex === undefined) return;
	const data = this.data();
	if (data === undefined) return;
	const titleId = data.titles[sliceIndex];
	this.hoveredTitleId = titleId;
	}

	onMouseOut() {
	this.hoveredTitleId = -1;
	}

	onMouseClick({x, y}: {x: number, y: number}): boolean {
	const sliceIndex = this.getSliceIndex({x, y});
	if (sliceIndex === undefined) return false;
	const data = this.data();
	if (data === undefined) return false;
	const sliceId = data.sliceIds[sliceIndex];
	if (sliceId !== undefined && sliceId !== -1) {
	globals.makeSelection(Actions.selectChromeSlice({
	id: sliceId,
	trackId: this.trackState.id,
	table: this.config.namespace
	}));
	return true;
	}
	return false;
	}

	getHeight() {
	return SLICE_HEIGHT * (this.config.maxDepth + 1) + 2 * TRACK_PADDING;
	}

	getSliceRect(tStart: number, tEnd: number, depth: number): SliceRect
	\|undefined {
	const {timeScale, visibleWindowTime} = globals.frontendLocalState;
	const pxEnd = timeScale.timeToPx(visibleWindowTime.end);
	const left = Math.max(timeScale.timeToPx(tStart), 0);
	const right = Math.min(timeScale.timeToPx(tEnd), pxEnd);
	return {
	left,
	width: Math.max(right - left, 1),
	top: TRACK_PADDING + depth * SLICE_HEIGHT,
	height: SLICE_HEIGHT,
	visible:
	!(tEnd <= visibleWindowTime.start \|\| tStart >= visibleWindowTime.end)
	};
	}
	}

	trackRegistry.register(ChromeSliceTrack);