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<!DOCTYPE html>
<!--
Copyright (c) 2013 The Chromium Authors. All rights reserved.
Use of this source code is governed by a BSD-style license that can be
found in the LICENSE file.
-->
<link rel="import" href="/tracing/base/sorted_array_utils.html">
<link rel="import" href="/tracing/ui/base/elided_cache.html">
<link rel="import" href="/tracing/ui/base/event_presenter.html">
<script>
'use strict';
/**
* @fileoverview Provides various helper methods for drawing to a provided
* canvas.
*/
tr.exportTo('tr.ui.b', function() {
var elidedTitleCache = new tr.ui.b.ElidedTitleCache();
var ColorScheme = tr.b.ColorScheme;
var colorsAsStrings = ColorScheme.colorsAsStrings;
var EventPresenter = tr.ui.b.EventPresenter;
var blackColorId = ColorScheme.getColorIdForReservedName('black');
/**
* This value is used to allow for consistent style UI elements.
* Thread time visualisation uses a smaller rectangle that has this height.
* @const
*/
var THIN_SLICE_HEIGHT = 4;
/**
* This value is used to for performance considerations when drawing large
* zoomed out traces that feature cpu time in the slices. If the waiting
* width is less than the threshold, we only draw the rectangle as a solid.
* @const
*/
var SLICE_WAITING_WIDTH_DRAW_THRESHOLD = 3;
/**
* If the slice has mostly been waiting to be scheduled on the cpu, the
* wall clock will be far greater than the cpu clock. Draw the slice
* only as an idle slice, if the active width is not thicker than the
* threshold.
* @const
*/
var SLICE_ACTIVE_WIDTH_DRAW_THRESHOLD = 1;
/**
* Should we elide text on trace labels?
* Without eliding, text that is too wide isn't drawn at all.
* Disable if you feel this causes a performance problem.
* This is a default value that can be overridden in tracks for testing.
* @const
*/
var SHOULD_ELIDE_TEXT = true;
/**
* Draw the define line into |ctx|.
*
* @param {Context} ctx The context to draw into.
* @param {float} x1 The start x position of the line.
* @param {float} y1 The start y position of the line.
* @param {float} x2 The end x position of the line.
* @param {float} y2 The end y position of the line.
*/
function drawLine(ctx, x1, y1, x2, y2) {
ctx.moveTo(x1, y1);
ctx.lineTo(x2, y2);
}
/**
* Draw the defined triangle into |ctx|.
*
* @param {Context} ctx The context to draw into.
* @param {float} x1 The first corner x.
* @param {float} y1 The first corner y.
* @param {float} x2 The second corner x.
* @param {float} y2 The second corner y.
* @param {float} x3 The third corner x.
* @param {float} y3 The third corner y.
*/
function drawTriangle(ctx, x1, y1, x2, y2, x3, y3) {
ctx.beginPath();
ctx.moveTo(x1, y1);
ctx.lineTo(x2, y2);
ctx.lineTo(x3, y3);
ctx.closePath();
}
/**
* Draw an arrow into |ctx|.
*
* @param {Context} ctx The context to draw into.
* @param {float} x1 The shaft x.
* @param {float} y1 The shaft y.
* @param {float} x2 The head x.
* @param {float} y2 The head y.
* @param {float} arrowLength The length of the head.
* @param {float} arrowWidth The width of the head.
*/
function drawArrow(ctx, x1, y1, x2, y2, arrowLength, arrowWidth) {
var dx = x2 - x1;
var dy = y2 - y1;
var len = Math.sqrt(dx * dx + dy * dy);
var perc = (len - arrowLength) / len;
var bx = x1 + perc * dx;
var by = y1 + perc * dy;
var ux = dx / len;
var uy = dy / len;
var ax = uy * arrowWidth;
var ay = -ux * arrowWidth;
ctx.beginPath();
drawLine(ctx, x1, y1, x2, y2);
ctx.stroke();
drawTriangle(ctx,
bx + ax, by + ay,
x2, y2,
bx - ax, by - ay);
ctx.fill();
}
/**
* Draw the provided slices to the screen.
*
* Each of the elements in |slices| must provide the follow methods:
* * start
* * duration
* * colorId
* * selected
*
* @param {Context} ctx The canvas context.
* @param {TimelineDrawTransform} dt The draw transform.
* @param {float} viewLWorld The left most point of the world viewport.
* @param {float} viewRWorld The right most point of the world viewport.
* @param {float} viewHeight The height of the viewport.
* @param {Array} slices The slices to draw.
* @param {bool} async Whether the slices are drawn with async style.
*/
function drawSlices(ctx, dt, viewLWorld, viewRWorld, viewHeight, slices,
async) {
var pixelRatio = window.devicePixelRatio || 1;
var pixWidth = dt.xViewVectorToWorld(1);
var height = viewHeight * pixelRatio;
var darkRectHeight = THIN_SLICE_HEIGHT * pixelRatio;
// Not enough space for both colors, use light color only.
if (height < darkRectHeight)
darkRectHeight = 0;
var lightRectHeight = height - darkRectHeight;
// Begin rendering in world space.
ctx.save();
dt.applyTransformToCanvas(ctx);
var rect = new tr.ui.b.FastRectRenderer(
ctx, 2 * pixWidth, 2 * pixWidth, colorsAsStrings);
rect.setYandH(0, height);
var lowSlice = tr.b.findLowIndexInSortedArray(
slices,
function(slice) { return slice.start + slice.duration; },
viewLWorld);
var hadTopLevel = false;
for (var i = lowSlice; i < slices.length; ++i) {
var slice = slices[i];
var x = slice.start;
if (x > viewRWorld)
break;
var w = pixWidth;
if (slice.duration > 0) {
w = Math.max(slice.duration, 0.000001);
if (w < pixWidth)
w = pixWidth;
}
var colorId = EventPresenter.getSliceColorId(slice);
var alpha = EventPresenter.getSliceAlpha(slice, async);
var lightAlpha = alpha * 0.70;
if (async && slice.isTopLevel) {
rect.setYandH(3, height - 3);
hadTopLevel = true;
} else {
rect.setYandH(0, height);
}
// If cpuDuration is available, draw rectangles proportional to the
// amount of cpu time taken.
if (!slice.cpuDuration) {
// No cpuDuration available, draw using only one alpha.
rect.fillRect(x, w, colorId, alpha);
continue;
}
var activeWidth = w * (slice.cpuDuration / slice.duration);
var waitingWidth = w - activeWidth;
// Check if we have enough screen space to draw the whole slice, with
// both color tones.
//
// Truncate the activeWidth to 0 if it is less than 'threshold' pixels.
if (activeWidth < SLICE_ACTIVE_WIDTH_DRAW_THRESHOLD * pixWidth) {
activeWidth = 0;
waitingWidth = w;
}
// Truncate the waitingWidth to 0 if it is less than 'threshold' pixels.
if (waitingWidth < SLICE_WAITING_WIDTH_DRAW_THRESHOLD * pixWidth) {
activeWidth = w;
waitingWidth = 0;
}
// We now draw the two rectangles making up the event slice.
// NOTE: The if statements are necessary for performance considerations.
// We do not want to force draws, if the width of the rectangle is 0.
//
// First draw the solid color, representing the 'active' part.
if (activeWidth > 0) {
rect.fillRect(x, activeWidth, colorId, alpha);
}
// Next draw the two toned 'idle' part.
// NOTE: Substracting pixWidth and drawing one extra pixel is done to
// prevent drawing artifacts. Without it, the two parts of the slice,
// ('active' and 'idle') may appear split apart.
if (waitingWidth > 0) {
// First draw the light toned top part.
rect.setYandH(0, lightRectHeight);
rect.fillRect(x + activeWidth - pixWidth,
waitingWidth + pixWidth, colorId, lightAlpha);
// Then the solid bottom half.
rect.setYandH(lightRectHeight, darkRectHeight);
rect.fillRect(x + activeWidth - pixWidth,
waitingWidth + pixWidth, colorId, alpha);
// Reset for the next slice.
rect.setYandH(0, height);
}
}
rect.flush();
if (async && hadTopLevel) {
// Draw a top border over async slices in order to visually separate
// them from events above it.
// See https://github.com/google/trace-viewer/issues/725.
rect.setYandH(2, 1);
for (var i = lowSlice; i < slices.length; ++i) {
var slice = slices[i];
var x = slice.start;
if (x > viewRWorld)
break;
if (!slice.isTopLevel)
continue;
var w = pixWidth;
if (slice.duration > 0) {
w = Math.max(slice.duration, 0.000001);
if (w < pixWidth)
w = pixWidth;
}
rect.fillRect(x, w, blackColorId, 0.7);
}
rect.flush();
}
ctx.restore();
}
/**
* Draw the provided instant slices as lines to the screen.
*
* Each of the elements in |slices| must provide the follow methods:
* * start
* * duration with value of 0.
* * colorId
* * selected
*
* @param {Context} ctx The canvas context.
* @param {TimelineDrawTransform} dt The draw transform.
* @param {float} viewLWorld The left most point of the world viewport.
* @param {float} viewRWorld The right most point of the world viewport.
* @param {float} viewHeight The height of the viewport.
* @param {Array} slices The slices to draw.
* @param {Numer} lineWidthInPixels The width of the lines.
*/
function drawInstantSlicesAsLines(
ctx, dt, viewLWorld, viewRWorld, viewHeight, slices, lineWidthInPixels) {
var pixelRatio = window.devicePixelRatio || 1;
var height = viewHeight * pixelRatio;
var pixWidth = dt.xViewVectorToWorld(1);
// Begin rendering in world space.
ctx.save();
ctx.lineWidth = pixWidth * lineWidthInPixels * pixelRatio;
dt.applyTransformToCanvas(ctx);
ctx.beginPath();
var lowSlice = tr.b.findLowIndexInSortedArray(
slices,
function(slice) { return slice.start; },
viewLWorld);
for (var i = lowSlice; i < slices.length; ++i) {
var slice = slices[i];
var x = slice.start;
if (x > viewRWorld)
break;
ctx.strokeStyle = EventPresenter.getInstantSliceColor(slice);
ctx.beginPath();
ctx.moveTo(x, 0);
ctx.lineTo(x, height);
ctx.stroke();
}
ctx.restore();
}
/**
* Draws the labels for the given slices.
*
* The |slices| array must contain objects with the following API:
* * start
* * duration
* * title
* * didNotFinish (optional)
*
* @param {Context} ctx The graphics context.
* @param {TimelineDrawTransform} dt The draw transform.
* @param {float} viewLWorld The left most point of the world viewport.
* @param {float} viewRWorld The right most point of the world viewport.
* @param {Array} slices The slices to label.
* @param {bool} async Whether the slice labels are drawn with async style.
* @param {float} fontSize The font size.
* @param {float} yOffset The font offset.
*/
function drawLabels(ctx, dt, viewLWorld, viewRWorld, slices, async,
fontSize, yOffset) {
var pixelRatio = window.devicePixelRatio || 1;
var pixWidth = dt.xViewVectorToWorld(1);
ctx.save();
ctx.textAlign = 'center';
ctx.textBaseline = 'top';
ctx.font = (fontSize * pixelRatio) + 'px sans-serif';
if (async)
ctx.font = 'italic ' + ctx.font;
var cY = yOffset * pixelRatio;
var lowSlice = tr.b.findLowIndexInSortedArray(
slices,
function(slice) { return slice.start + slice.duration; },
viewLWorld);
// Don't render text until until it is 20px wide
var quickDiscardThresshold = pixWidth * 20;
for (var i = lowSlice; i < slices.length; ++i) {
var slice = slices[i];
if (slice.start > viewRWorld)
break;
if (slice.duration <= quickDiscardThresshold)
continue;
var title = slice.title +
(slice.didNotFinish ? ' (Did Not Finish)' : '');
var drawnTitle = title;
var drawnWidth = elidedTitleCache.labelWidth(ctx, drawnTitle);
var fullLabelWidth = elidedTitleCache.labelWidthWorld(
ctx, drawnTitle, pixWidth);
if (SHOULD_ELIDE_TEXT && fullLabelWidth > slice.duration) {
var elidedValues = elidedTitleCache.get(
ctx, pixWidth,
drawnTitle, drawnWidth,
slice.duration);
drawnTitle = elidedValues.string;
drawnWidth = elidedValues.width;
}
if (drawnWidth * pixWidth < slice.duration) {
ctx.fillStyle = EventPresenter.getTextColor(slice);
var cX = dt.xWorldToView(slice.start + 0.5 * slice.duration);
ctx.fillText(drawnTitle, cX, cY, drawnWidth);
}
}
ctx.restore();
}
return {
drawSlices: drawSlices,
drawInstantSlicesAsLines: drawInstantSlicesAsLines,
drawLabels: drawLabels,
drawLine: drawLine,
drawTriangle: drawTriangle,
drawArrow: drawArrow,
elidedTitleCache_: elidedTitleCache,
THIN_SLICE_HEIGHT: THIN_SLICE_HEIGHT
};
});
</script>
|
