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<?xml version="1.0"?>
<svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="1000" height="800">
<title>Touch input event flow on B2G</title>
<g id="arrows"></g>
<style type="text/css"><![CDATA[
text {
fill: black;
text-anchor: middle;
white-space: pre-line;
font-size: 14px;
}
rect {
fill: none;
}
line {
stroke: black;
}
.parentinput rect {
stroke: black;
}
text.parentinput {
fill: black;
text-anchor: start;
}
.parentmain rect {
stroke: orange;
}
text.parentmain {
fill: orange;
text-anchor: start;
}
.parentcompositor rect {
stroke: green;
}
text.parentcompositor {
fill: green;
text-anchor: start;
}
.childmain rect {
stroke: red;
}
text.childmain {
fill: red;
text-anchor: start;
}
.bothmain rect {
stroke: blue;
}
text.bothmain {
fill: blue;
text-anchor: start;
}
]]></style>
<script type="text/javascript"><![CDATA[
var svg = "http://www.w3.org/2000/svg";
var maxY = 0;
function breaks(text) {
var count = 0;
for (var i = text.length - 1; i >= 0; i--) {
if (text.charAt(i) == '\n') {
count++;
}
}
return count;
}
function makeAction(text, x, y, thread) {
maxY = Math.max(maxY, y);
var g = document.createElementNS(svg, "g");
g.setAttribute("class", "action " + thread);
g.setAttribute("transform", "translate(" + x + ", " + (y + 30) + ")");
var r = document.createElementNS(svg, "rect");
r.setAttribute("width", "100");
r.setAttribute("height", "40");
var t = document.createElementNS(svg, "text");
t.setAttribute("x", "50");
t.setAttribute("y", 25 - (7 * breaks(text)));
t.appendChild(document.createTextNode(text));
g.appendChild(r);
g.appendChild(t);
return g;
}
function makeChoice(text, x, y, thread) {
maxY = Math.max(maxY, y);
var g = document.createElementNS(svg, "g");
g.setAttribute("class", "choice " + thread);
g.setAttribute("transform", "translate(" + (x + 15) + ", " + (y + 15) + ")");
var g2 = document.createElementNS(svg, "g");
g2.setAttribute("transform", "rotate(-45, 35, 35)");
var r = document.createElementNS(svg, "rect");
r.setAttribute("width", "70");
r.setAttribute("height", "70");
g2.appendChild(r);
var t = document.createElementNS(svg, "text");
t.setAttribute("x", "35");
t.setAttribute("y", 40 - (7 * breaks(text)));
t.appendChild(document.createTextNode(text));
g.appendChild(g2);
g.appendChild(t);
return g;
}
function makeLabelChoice(label, point) {
var t = document.createElementNS(svg, "text");
t.setAttribute("x", point.x);
t.setAttribute("y", point.y);
t.appendChild(document.createTextNode(label));
return t;
}
function makeLine(sx, sy, ex, ey) {
maxY = Math.max(maxY, sy, ey);
var l = document.createElementNS(svg, "line");
l.setAttribute("x1", sx);
l.setAttribute("y1", sy);
l.setAttribute("x2", ex);
l.setAttribute("y2", ey);
return l;
}
function makeArrow(start, end) {
var g = document.createElementNS(svg, "g");
g.appendChild(makeLine(start.x, start.y, end.x, end.y));
if (start.x != end.x) {
start.x = end.x + (4 * Math.sign(start.x - end.x));
g.appendChild(makeLine(start.x, start.y - 4, end.x, end.y));
g.appendChild(makeLine(start.x, start.y + 4, end.x, end.y));
} else if (start.y != end.y) {
start.y = end.y + (4 * Math.sign(start.y - end.y));
g.appendChild(makeLine(start.x - 4, start.y, end.x, end.y));
g.appendChild(makeLine(start.x + 4, start.y, end.x, end.y));
}
return g;
}
function makeVHArrow(start, end) {
var g = document.createElementNS(svg, "g");
g.appendChild(makeLine(start.x, start.y, start.x, end.y));
start.y = end.y;
g.appendChild(makeArrow(start, end));
return g;
}
function makeHVArrow(start, end) {
var g = document.createElementNS(svg, "g");
g.appendChild(makeLine(start.x, start.y, end.x, start.y));
start.x = end.x;
g.appendChild(makeArrow(start, end));
return g;
}
function makeVHVArrow(start, end, length) {
var g = document.createElementNS(svg, "g");
g.appendChild(makeLine(start.x, start.y, start.x, start.y + length));
start.y += length;
g.appendChild(makeLine(start.x, start.y, end.x, start.y));
start.x = end.x;
g.appendChild(makeArrow(start, end));
return g;
}
function makeHVHArrow(start, end, length) {
var g = document.createElementNS(svg, "g");
g.appendChild(makeLine(start.x, start.y, start.x + length, start.y));
start.x += length;
g.appendChild(makeLine(start.x, start.y, start.x, end.y));
start.y = end.y;
g.appendChild(makeArrow(start, end));
return g;
}
function translation(group) {
var r = new RegExp("translate\\((\\d+), (\\d+)\\)");
var result = r.exec(group.getAttribute("transform"));
return { x: parseInt(result[1]), y: parseInt(result[2]) };
}
function isAction(group) {
return group.classList.contains("action");
}
function isChoice(group) {
return group.classList.contains("choice");
}
function offset(point, x, y) {
point.x += x;
point.y += y;
return point;
}
function rightOf(group) {
var t = translation(group);
if (isAction(group)) {
return offset(t, 100, 20);
}
if (isChoice(group)) {
return offset(t, 85, 35);
}
return t;
}
function leftOf(group) {
var t = translation(group);
if (isAction(group)) {
return offset(t, 0, 20);
}
if (isChoice(group)) {
return offset(t, -15, 35);
}
return t;
}
function topOf(group) {
var t = translation(group);
if (isAction(group)) {
return offset(t, 50, 0);
}
if (isChoice(group)) {
return offset(t, 35, -15);
}
return t;
}
function bottomOf(group) {
var t = translation(group);
if (isAction(group)) {
return offset(t, 50, 40);
}
if (isChoice(group)) {
return offset(t, 35, 85);
}
return t;
}
function midpoint(start, end) {
return { x: (start.x + end.x) / 2,
y: (start.y + end.y) / 2 };
}
function makeLegend(label, thread) {
var t = document.createElementNS(svg, "text");
t.setAttribute("x", "10");
t.setAttribute("y", maxY);
t.setAttribute("class", thread);
maxY += 15;
t.appendChild(document.createTextNode(label));
return t;
}
var android = makeAction("Android/Gonk", 20, 0, "parentinput");
var sendNative = makeAction("DOMWindowUtils\nsendNativeTouchPoint", 20, 100, "parentmain");
var apzHitTest = makeAction("APZ hit test", 150, 0, "parentcompositor");
var apzUntransform = makeAction("APZ\nuntransform", 300, 0, "parentcompositor");
var apzGesture = makeAction("APZ gesture\ndetection", 450, 0, "parentcompositor");
var apzTransform = makeAction("APZ transform\nupdate", 600, 0, "parentcompositor");
var compositor = makeAction("Compositor", 750, 0, "parentcompositor");
var nsAppShell = makeAction("nsAppShell", 150, 100, "parentmain");
var rootHitTest = makeAction("Gecko hit test\n(root process)", 300, 100, "parentmain");
var rootEsm = makeAction("Gecko ESM\n(root process)", 450, 100, "parentmain");
var isEdgeGesture = makeChoice("Edge gesture?", 300, 200, "parentmain");
var edgeConsume = makeAction("Consume\nevent block", 150, 200, "parentmain");
var bepjsm = makeAction("BEParent.jsm\nsendTouchEvent", 450, 200, "parentmain");
var iframeSend = makeAction("HTMLIFrameElement\nsendTouchEvent", 20, 275, "parentmain");
var isApzTarget = makeChoice("Target\nhas APZ?", 600, 200, "parentmain");
var sendTouchEvent = makeAction("Target\nsendTouchEventToWindow", 750, 100, "parentmain");
var injectTouch = makeAction("injectTouchEvent", 750, 200, "parentmain");
var targetESM = makeAction("Target window\nESM", 750, 450, "bothmain");
var tabParent = makeAction("TabParent", 750, 350, "parentmain");
var geckoUntransform = makeAction("Gecko\nuntransform", 600, 350, "parentmain");
var tabChild = makeAction("TabChild", 450, 350, "childmain");
var isApzcEnabled = makeChoice("APZ\nenabled?", 300, 350, "childmain");
var tabGesture = makeAction("TabChild gesture\ndetection", 150, 350, "childmain");
var childHitTest = makeAction("Gecko hit test\n(child process)", 300, 450, "childmain");
var childEsm = makeAction("Gecko ESM\n(child process)", 450, 450, "childmain");
var childContent = makeAction("Content\n(child process)", 600, 450, "childmain");
document.documentElement.appendChild(android);
document.documentElement.appendChild(sendNative);
document.documentElement.appendChild(apzHitTest);
document.documentElement.appendChild(apzUntransform);
document.documentElement.appendChild(apzGesture);
document.documentElement.appendChild(apzTransform);
document.documentElement.appendChild(compositor);
document.documentElement.appendChild(nsAppShell);
document.documentElement.appendChild(rootHitTest);
document.documentElement.appendChild(rootEsm);
document.documentElement.appendChild(isEdgeGesture);
document.documentElement.appendChild(edgeConsume);
document.documentElement.appendChild(bepjsm);
document.documentElement.appendChild(iframeSend);
document.documentElement.appendChild(isApzTarget);
document.documentElement.appendChild(sendTouchEvent);
document.documentElement.appendChild(injectTouch);
document.documentElement.appendChild(targetESM);
document.documentElement.appendChild(tabParent);
document.documentElement.appendChild(geckoUntransform);
document.documentElement.appendChild(tabChild);
document.documentElement.appendChild(isApzcEnabled);
document.documentElement.appendChild(tabGesture);
document.documentElement.appendChild(childHitTest);
document.documentElement.appendChild(childEsm);
document.documentElement.appendChild(childContent);
document.documentElement.appendChild(makeLabelChoice("Y", offset(leftOf(isEdgeGesture), -5, -5)));
document.documentElement.appendChild(makeLabelChoice("N", offset(rightOf(isEdgeGesture), 5, -5)));
document.documentElement.appendChild(makeLabelChoice("N", offset(topOf(isApzTarget), 8, -10)));
document.documentElement.appendChild(makeLabelChoice("Y", offset(rightOf(isApzTarget), 10, 14)));
document.documentElement.appendChild(makeLabelChoice("N", offset(leftOf(isApzcEnabled), -5, -5)));
document.documentElement.appendChild(makeLabelChoice("Y", offset(bottomOf(isApzcEnabled), 10, 14)));
var arrows = document.getElementById('arrows');
arrows.appendChild(makeArrow(rightOf(android), leftOf(apzHitTest)));
arrows.appendChild(makeVHVArrow(topOf(sendNative), midpoint(rightOf(android), leftOf(apzHitTest)), -20));
arrows.appendChild(makeArrow(rightOf(apzHitTest), leftOf(apzUntransform)));
arrows.appendChild(makeArrow(rightOf(apzUntransform), leftOf(apzGesture)));
arrows.appendChild(makeArrow(rightOf(apzGesture), leftOf(apzTransform)));
arrows.appendChild(makeArrow(rightOf(apzTransform), leftOf(compositor)));
arrows.appendChild(makeVHVArrow(midpoint(leftOf(apzUntransform), rightOf(apzGesture)), topOf(nsAppShell), 40));
arrows.appendChild(makeArrow(rightOf(nsAppShell), leftOf(rootHitTest)));
arrows.appendChild(makeArrow(rightOf(rootHitTest), leftOf(rootEsm)));
arrows.appendChild(makeVHVArrow(bottomOf(rootEsm), topOf(isEdgeGesture), 15));
arrows.appendChild(makeArrow(leftOf(isEdgeGesture), rightOf(edgeConsume)));
arrows.appendChild(makeArrow(rightOf(isEdgeGesture), leftOf(bepjsm), 20));
arrows.appendChild(makeHVArrow(rightOf(iframeSend), bottomOf(bepjsm)));
arrows.appendChild(makeArrow(rightOf(bepjsm), leftOf(isApzTarget)));
arrows.appendChild(makeArrow(rightOf(isApzTarget), leftOf(injectTouch)));
arrows.appendChild(makeArrow(bottomOf(injectTouch), topOf(tabParent)));
arrows.appendChild(makeVHArrow(topOf(isApzTarget), leftOf(sendTouchEvent)));
arrows.appendChild(makeHVHArrow(rightOf(sendTouchEvent), rightOf(targetESM), 30));
arrows.appendChild(makeArrow(leftOf(tabParent), rightOf(geckoUntransform)));
arrows.appendChild(makeArrow(leftOf(geckoUntransform), rightOf(tabChild)));
arrows.appendChild(makeArrow(leftOf(tabChild), rightOf(isApzcEnabled)));
arrows.appendChild(makeArrow(leftOf(isApzcEnabled), rightOf(tabGesture)));
arrows.appendChild(makeArrow(bottomOf(isApzcEnabled), topOf(childHitTest)));
arrows.appendChild(makeVHArrow(bottomOf(tabGesture), leftOf(childHitTest)));
arrows.appendChild(makeArrow(rightOf(childHitTest), leftOf(childEsm)));
arrows.appendChild(makeArrow(rightOf(childEsm), leftOf(childContent)));
arrows.appendChild(makeVHVArrow(midpoint(leftOf(apzGesture), rightOf(apzTransform)), topOf(tabChild), 300));
document.documentElement.appendChild(makeLegend("Main process input thread", "parentinput"));
document.documentElement.appendChild(makeLegend("Main process main thread", "parentmain"));
document.documentElement.appendChild(makeLegend("Main process compositor thread", "parentcompositor"));
document.documentElement.appendChild(makeLegend("Child process main thread", "childmain"));
document.documentElement.appendChild(makeLegend("Undetermined process main thread", "bothmain"));
]]></script>
</svg>
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