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POHTML5 Canvas drawImage ratio bug iOS
primarykey
Id
11929099
data
AcceptedAnswerId
12816406
AnswerCount
5
ClosedDate
CommentCount
5
CommunityOwnedDate
CreationDate
2012-08-13T06:23:16.983
FavoriteCount
48
LastActivityDate
2014-08-10T16:51:21.253
LastEditDate
LastEditorUserId
0
OwnerUserId
1097744
ParentId
0
PostTypeId
1
Score
52
ViewCount
40757
LastEditorDisplayName
text
Body
I want to resize the image taken from the iOS camera on the client side with HTML5 Canvas but I keep running in this weird bug where the image has a wrong ratio if bigger than ~1.5mb It works on the desktop but not in the latest iOS version with the media upload API. You can see an example here: <a href="http://jsbin.com/ekuros/1">http://jsbin.com/ekuros/1</a> Any idea how to fix this please? Is this a memory issue? <pre><code>$('#file').on('change', function (e) { var file = e.currentTarget.files[0]; var reader = new FileReader(); reader.onload = function (e) { var image = $('<img/>'); image.on('load', function () { var square = 320; var canvas = document.createElement('canvas'); canvas.width = square; canvas.height = square; var context = canvas.getContext('2d'); context.clearRect(0, 0, square, square); var imageWidth; var imageHeight; var offsetX = 0; var offsetY = 0; if (this.width > this.height) { imageWidth = Math.round(square * this.width / this.height); imageHeight = square; offsetX = - Math.round((imageWidth - square) / 2); } else { imageHeight = Math.round(square * this.height / this.width); imageWidth = square; offsetY = - Math.round((imageHeight - square) / 2); } context.drawImage(this, offsetX, offsetY, imageWidth, imageHeight); var data = canvas.toDataURL('image/jpeg'); var thumb = $('<img/>'); thumb.attr('src', data); $('body').append(thumb); }); image.attr('src', e.target.result); }; reader.readAsDataURL(file); }); </code></pre>
Tags
<javascript><ios><html5><canvas>
Title
HTML5 Canvas drawImage ratio bug iOS
singulars
PostAcceptedAnswerId
1. PO
 singulars
 PostTypePostTypeId
 PTAnswer
PostParentId
1. This table or related slice is empty.
PostTypePostTypeId
1. PTQuestion
UserLastEditorUserId
1. This table or related slice is empty.
UserOwnerUserId
1. USBrice Lechatellier
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PostLinksPostIdRelatedPostId
1. PL
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 LinkTypeLinkTypeId
 LTLinked
PostLinksRelatedPostIdPostId
1. PL
 singulars
 LinkTypeLinkTypeId
 LTLinked
2. PL
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 LinkTypeLinkTypeId
 LTLinked
3. PL
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 LinkTypeLinkTypeId
 LTLinked
PostsAcceptedAnswerId
1. This table or related slice is empty.
PostsParentIdCreationDate
1. PO
 singulars
 PostTypePostTypeId
 PTAnswer
2. PO
 singulars
 PostTypePostTypeId
 PTAnswer
3. PO
 singulars
 PostTypePostTypeId
 PTAnswer
VotesPostIdCreationDate
1. VO
 singulars
 PostPostId
 POHTML5 Canvas drawImage ratio bug iOS
 UserUserId
 This table or related slice is empty.
 VoteTypeVoteTypeId
 VTUpMod
2. VO
 singulars
 PostPostId
 POHTML5 Canvas drawImage ratio bug iOS
 UserUserId
 This table or related slice is empty.
 VoteTypeVoteTypeId
 VTUpMod
3. VO
 singulars
 PostPostId
 POHTML5 Canvas drawImage ratio bug iOS
 UserUserId
 USgoker.cebeci
 VoteTypeVoteTypeId
 VTFavorite
CommentsPostId

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