Sakurai/pdf.js
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Optimize scale calculation in text_layer.js

Browse Source 
This patch avoids having to calculate the scale twice by saving it in
the properties object.

Moreover, we remove a temporary variable and place parentheses around a
calculation inside a string concatenation.
This commit is contained in:
Tim van der Meij 2016-09-04 20:19:31 +02:00
parent b3818d5c36
commit 96593571eb
1 changed files with 10 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
src/display/text_layer.js
View File

@ -67,11 +67,11 @@ var renderTextLayer = (function renderTextLayerClosure() {
canvasWidth: 0,
isWhitespace: false,
originalTransform: '',
originalWidth: 0,
paddingBottom: 0,
paddingLeft: 0,
paddingRight: 0,
paddingTop: 0,
scale: 1,
};
task._textDivs.push(textDiv);
@ -205,17 +205,15 @@ var renderTextLayer = (function renderTextLayerClosure() {
}
var width = ctx.measureText(textDiv.textContent).width;
textDivProperties.originalWidth = width;
textLayerFrag.appendChild(textDiv);
var transform = '';
if (textDivProperties.canvasWidth !== 0 && width > 0) {
var scale = textDivProperties.canvasWidth / width;
transform = 'scaleX(' + scale + ')';
textDivProperties.scale = textDivProperties.canvasWidth / width;
transform = 'scaleX(' + textDivProperties.scale + ')';
}
var rotation = textDivProperties.angle;
if (rotation !== 0) {
transform = 'rotate(' + rotation + 'deg) ' + transform;
if (textDivProperties.angle !== 0) {
transform = 'rotate(' + textDivProperties.angle + 'deg) ' + transform;
}
if (transform !== '') {
textDivProperties.originalTransform = transform;
@ -569,21 +567,18 @@ var renderTextLayer = (function renderTextLayerClosure() {
if (expandDivs) {
var transform = '';
var scale = 1;
if (divProperties.canvasWidth !== 0 &&
divProperties.originalWidth > 0) {
scale = divProperties.canvasWidth / divProperties.originalWidth;
transform = 'scaleX(' + scale + ')';
if (divProperties.scale !== 1) {
transform = 'scaleX(' + divProperties.scale + ')';
}
if (divProperties.angle !== 0) {
transform = 'rotate(' + divProperties.angle + 'deg) ' + transform;
}
if (divProperties.paddingLeft !== 0) {
div.style.paddingLeft =
(divProperties.paddingLeft / scale) + 'px';
(divProperties.paddingLeft / divProperties.scale) + 'px';
transform += ' translateX(' +
(-divProperties.paddingLeft / scale) + 'px)';
(-divProperties.paddingLeft / divProperties.scale) + 'px)';
}
if (divProperties.paddingTop !== 0) {
div.style.paddingTop = divProperties.paddingTop + 'px';
@ -591,7 +586,7 @@ var renderTextLayer = (function renderTextLayerClosure() {
}
if (divProperties.paddingRight !== 0) {
div.style.paddingRight =
divProperties.paddingRight / scale + 'px';
(divProperties.paddingRight / divProperties.scale) + 'px';
}
if (divProperties.paddingBottom !== 0) {
div.style.paddingBottom = divProperties.paddingBottom + 'px';