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Merge pull request #966 from plougsgaard/fix-ios-zoom-bug

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Disable part of `8c4fcc9` when running on an iOS device
This commit is contained in:
Ian Gilman 2016-06-20 09:15:12 -07:00 committed by GitHub
commit e3edf20e22
3 changed files with 24 additions and 1 deletions
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19
src/openseadragon.js
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@ -239,6 +239,12 @@
* A zoom percentage ( where 1 is 100% ) of the highest resolution level.
* When zoomed in beyond this value alternative compositing will be used to
* smooth out the edges between tiles. This will have a performance impact.
* Can be set to Infinity to turn it off.
* Note: This setting is ignored on iOS devices due to a known bug (See {@link https://github.com/openseadragon/openseadragon/issues/952})
*
* @property {Boolean} [iOSDevice=?]
* True if running on an iOS device, false otherwise.
* Used to disable certain features that behave differently on iOS devices.
*
* @property {Boolean} [autoResize=true]
* Set to false to prevent polling for viewer size changes. Useful for providing custom resize behavior.
@ -981,6 +987,18 @@ if (typeof define === 'function' && define.amd) {
return target;
};
var isIOSDevice = function () {
if (typeof navigator !== 'object') {
return false;
}
var userAgent = navigator.userAgent;
if (typeof userAgent !== 'string') {
return false;
}
return userAgent.indexOf('iPhone') !== -1 ||
userAgent.indexOf('iPad') !== -1 ||
userAgent.indexOf('iPod') !== -1;
};
$.extend( $, /** @lends OpenSeadragon */{
/**
@ -1031,6 +1049,7 @@ if (typeof define === 'function' && define.amd) {
minZoomImageRatio: 0.9, //-> closer to 0 allows zoom out to infinity
maxZoomPixelRatio: 1.1, //-> higher allows 'over zoom' into pixels
smoothTileEdgesMinZoom: 1.1, //-> higher than maxZoomPixelRatio disables it
iOSDevice: isIOSDevice(),
pixelsPerWheelLine: 40,
autoResize: true,
preserveImageSizeOnResize: false, // requires autoResize=true

5
src/tiledimage.js
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@ -69,6 +69,7 @@
* @param {Boolean} [options.alwaysBlend] - See {@link OpenSeadragon.Options}.
* @param {Number} [options.minPixelRatio] - See {@link OpenSeadragon.Options}.
* @param {Number} [options.smoothTileEdgesMinZoom] - See {@link OpenSeadragon.Options}.
* @param {Boolean} [options.iOSDevice] - See {@link OpenSeadragon.Options}.
* @param {Number} [options.opacity=1] - Opacity the tiled image should be drawn at.
* @param {String} [options.compositeOperation] - How the image is composited onto other images; see compositeOperation in {@link OpenSeadragon.Options} for possible values.
* @param {Boolean} [options.debugMode] - See {@link OpenSeadragon.Options}.
@ -153,6 +154,7 @@ $.TiledImage = function( options ) {
alwaysBlend: $.DEFAULT_SETTINGS.alwaysBlend,
minPixelRatio: $.DEFAULT_SETTINGS.minPixelRatio,
smoothTileEdgesMinZoom: $.DEFAULT_SETTINGS.smoothTileEdgesMinZoom,
iOSDevice: $.DEFAULT_SETTINGS.iOSDevice,
debugMode: $.DEFAULT_SETTINGS.debugMode,
crossOriginPolicy: $.DEFAULT_SETTINGS.crossOriginPolicy,
placeholderFillStyle: $.DEFAULT_SETTINGS.placeholderFillStyle,
@ -1434,9 +1436,10 @@ function drawTiles( tiledImage, lastDrawn ) {
var zoom = tiledImage.viewport.getZoom(true);
var imageZoom = tiledImage.viewportToImageZoom(zoom);
if (imageZoom > tiledImage.smoothTileEdgesMinZoom) {
if (imageZoom > tiledImage.smoothTileEdgesMinZoom && !tiledImage.iOSDevice) {
// When zoomed in a lot (>100%) the tile edges are visible.
// So we have to composite them at ~100% and scale them up together.
// Note: Disabled on iOS devices per default as it causes a native crash
useSketch = true;
sketchScale = tile.getScaleForEdgeSmoothing();
sketchTranslate = tile.getTranslationForEdgeSmoothing(sketchScale,

1
src/viewer.js
View File

@ -1375,6 +1375,7 @@ $.extend( $.Viewer.prototype, $.EventSource.prototype, $.ControlDock.prototype,
alwaysBlend: _this.alwaysBlend,
minPixelRatio: _this.minPixelRatio,
smoothTileEdgesMinZoom: _this.smoothTileEdgesMinZoom,
iOSDevice: _this.iOSDevice,
crossOriginPolicy: _this.crossOriginPolicy,
debugMode: _this.debugMode
});