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Measure height only once per font

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This commit is contained in:
Andreas Hocevar
2017-10-31 08:48:02 +01:00
parent 4a73754b93
commit b29e74d1ab
1 changed files with 15 additions and 11 deletions
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26
src/ol/render/canvas/textreplay.js
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@@ -135,18 +135,22 @@ ol.render.canvas.TextReplay.labelCache_ = new ol.structs.LRUCache();
*/
ol.render.canvas.TextReplay.measureTextHeight = (function() {
var span;
return function(font, lines, widths) {
if (!span) {
span = document.createElement('span');
span.textContent = 'M';
span.style.margin = span.style.padding = '0 !important';
span.style.position = 'absolute !important';
span.style.left = '-99999px !important';
var heights = {};
return function(font) {
var height = heights[font];
if (height == undefined) {
if (!span) {
span = document.createElement('span');
span.textContent = 'M';
span.style.margin = span.style.padding = '0 !important';
span.style.position = 'absolute !important';
span.style.left = '-99999px !important';
}
span.style.font = font;
document.body.appendChild(span);
height = heights[font] = span.offsetHeight;
document.body.removeChild(span);
}
span.style.font = font;
document.body.appendChild(span);
var height = span.offsetHeight;
document.body.removeChild(span);
return height;
};
})();