78971 2012-02-18 12:52:08 -0800 Default canvas backing store to be 1:1 with specified dimensions. 2012-02-22 09:36:07 -0800 1 1 1 Unclassified WebKit New Bugs 528+ (Nightly build) Unspecified Unspecified RESOLVED FIXED P2 Normal --- 66687 78973 1 jknotten jknotten abarth ap efidler eoconnor eric mdelaney7 sam webkit.review.bot oldest_to_newest 559812 0 jknotten 2012-02-18 12:52:08 -0800 Introduce WebCore Setting for Canvas Backing Store 559815 1 127711 jknotten 2012-02-18 13:00:56 -0800 Created attachment 127711 Patch 559846 2 sam 2012-02-18 17:30:51 -0800 I am not clear on how an embedder would make this decision or why they would want anything but the default. 559903 3 jknotten 2012-02-19 08:40:52 -0800 Right now, using a backing store larger than 1:1 has issues, at least on the Chromium port, which are captured at https://bugs.webkit.org/show_bug.cgi?id=73645 . On the desktop, the deviceScaleFactor is 1 anyway, so we don't see these issues. However, on a high-dpi mobile system the deviceScaleFactor can be 2, which is where these issues would be seen. iOS 5.0 WebKit hard codes the backing store to be 1:1, perhaps for the same reasons. See the initialisation of m_pageScaleFactor to 1 in the constructor of HTMLCanvasElement.cpp http://opensource.apple.com/source/WebCore/WebCore-1298/html/HTMLCanvasElement.cpp Fixing the issues relating to high-dpi is a longer term project, so in the mean time it is desirable to be able to have a correctly functioning canvas (according to the spec and tests). Another aspect of this is that many web developers typically do not expect a difference between backing store and specified canvas dimensions, despite the spec allowing this. When converting the canvas to a data url, for example, many developers expect that the size of the image will be according to the canvas dimensions, rather than the backing store dimensions (See https://www.w3.org/Bugs/Public/show_bug.cgi?id=15041 ) 559933 4 sam 2012-02-19 12:57:08 -0800 (In reply to comment #3) > Right now, using a backing store larger than 1:1 has issues, at least on the Chromium port, which are captured at https://bugs.webkit.org/show_bug.cgi?id=73645 . On the desktop, the deviceScaleFactor is 1 anyway, so we don't see these issues. However, on a high-dpi mobile system the deviceScaleFactor can be 2, which is where these issues would be seen. > > iOS 5.0 WebKit hard codes the backing store to be 1:1, perhaps for the same reasons. See the initialisation of m_pageScaleFactor to 1 in the constructor of HTMLCanvasElement.cpp http://opensource.apple.com/source/WebCore/WebCore-1298/html/HTMLCanvasElement.cpp > > Fixing the issues relating to high-dpi is a longer term project, so in the mean time it is desirable to be able to have a correctly functioning canvas (according to the spec and tests). > > Another aspect of this is that many web developers typically do not expect a difference between backing store and specified canvas dimensions, despite the spec allowing this. When converting the canvas to a data url, for example, many developers expect that the size of the image will be according to the canvas dimensions, rather than the backing store dimensions (See https://www.w3.org/Bugs/Public/show_bug.cgi?id=15041 ) Ok, so on what port would you want non 1:1? This change seems to only create the possibility for more incompatibilities between different ports of WebKit which should be avoided. 559934 5 jknotten 2012-02-19 12:59:52 -0800 I think that for now, probably all ports should use 1:1, however, it would be helpful for the fixing of 73645 if there was an easy way to switch back to the 'high-dpi' backing canvas. It sounds like a WebCore setting may not be the best way to do this. Would a ENABLE(HIGH_DPI_CANVAS) option be better here, do you think? 559936 6 sam 2012-02-19 13:20:23 -0800 (In reply to comment #5) > I think that for now, probably all ports should use 1:1, however, it would be helpful for the fixing of 73645 if there was an easy way to switch back to the 'high-dpi' backing canvas. > > It sounds like a WebCore setting may not be the best way to do this. Would a ENABLE(HIGH_DPI_CANVAS) option be better here, do you think? Yes. 559950 7 127742 jknotten 2012-02-19 14:25:08 -0800 Created attachment 127742 Patch 560565 8 127742 webkit.review.bot 2012-02-20 19:48:46 -0800 Comment on attachment 127742 Patch Clearing flags on attachment: 127742 Committed r108293: <http://trac.webkit.org/changeset/108293> 560566 9 webkit.review.bot 2012-02-20 19:48:51 -0800 All reviewed patches have been landed. Closing bug. 127711 2012-02-18 13:00:56 -0800 2012-02-19 14:25:05 -0800 Patch bug-78971-20120218130055.patch text/plain 5307 jknotten U3VidmVyc2lvbiBSZXZpc2lvbjogMTA4MTY2CmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9D aGFuZ2VMb2cgYi9Tb3VyY2UvV2ViQ29yZS9DaGFuZ2VMb2cKaW5kZXggMWJkYzA1ODc3MDlhMjU2 OTcxMTAxOGU5Yzg3ZmEyZjdkN2MwMWIxMS4uODAwMjJkNDkyNTUzODhhNjU0OWE5NDQ3MTQyZjll MGNlMzIzZjM0YSAxMDA2NDQKLS0tIGEvU291cmNlL1dlYkNvcmUvQ2hhbmdlTG9nCisrKyBiL1Nv dXJjZS9XZWJDb3JlL0NoYW5nZUxvZwpAQCAtMSwzICsxLDM5IEBACisyMDEyLTAyLTE4ICBKb2hu IEtub3R0ZW5iZWx0ICA8amtub3R0ZW5AY2hyb21pdW0ub3JnPgorCisgICAgICAgIEludHJvZHVj ZSBXZWJDb3JlIFNldHRpbmcgZm9yIENhbnZhcyBCYWNraW5nIFN0b3JlCisgICAgICAgIGh0dHBz Oi8vYnVncy53ZWJraXQub3JnL3Nob3dfYnVnLmNnaT9pZD03ODk3MQorCisgICAgICAgIFJldmll d2VkIGJ5IE5PQk9EWSAoT09QUyEpLgorCisgICAgICAgIENhbnZhcywgYnkgZGVmYXVsdCwgdXNl cyB0aGUgZGV2aWNlU2NhbGVGYWN0b3IgdG8gc2NhbGUgdGhlIHNpemUKKyAgICAgICAgb2YgdGhl IGJhY2tpbmcgaW1hZ2UuIFRvIGRhdGUsIHRoaXMgZGV2aWNlU2NhbGVGYWN0b3IgaGFzIGJlZW4g 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