11397 2010-11-24 17:08:28 +0000 Additional compositing operations such as 'max-alpha' and 'min-alpha' would make it much easier to make soft brush and eraser tools in painting applications. 2012-02-29 22:41:13 +0000 1 1 1 Unclassified HTML WG LC1 HTML Canvas 2D Context unspecified All All RESOLVED NEEDSINFO http://www.whatwg.org/specs/web-apps/current-work/#compositing canvas RFE P3 enhancement --- 1 contributor ian dbaron ian mike public-html-admin public-html-wg-issue-tracking richard public-html-bugzilla oldest_to_newest 42750 0 contributor 2010-11-24 17:08:28 +0000 Specification: http://www.whatwg.org/specs/web-apps/current-work/ Section: http://www.whatwg.org/specs/web-apps/current-work/complete.html#compositing Comment: Additional compositing operations such as 'max-alpha' and 'min-alpha' would make it much easier to make soft brush and eraser tools in painting applications. Posted from: 87.114.199.5 42755 1 dbaron 2010-11-24 20:32:26 +0000 Do you have documentation for (a) how they work and (b) whether major 2D graphics systems support them? 42780 2 richard 2010-11-25 16:19:54 +0000 I couldn't find any graphics library support for 'max-alpha' or 'min-alpha' unfortunately, but Cairo and Qt do support a broader set of compositing modes: - http://cairographics.org/manual/cairo-cairo-t.html#cairo-operator-t - http://doc.qt.nokia.com/4.7/qpainter.html#CompositionMode-enum 44034 3 ian 2011-01-10 22:12:09 +0000 EDITOR'S RESPONSE: This is an Editor's Response to your comment. If you are satisfied with this response, please change the state of this bug to CLOSED. If you have additional information and would like the editor to reconsider, please reopen this bug. If you would like to escalate the issue to the full HTML Working Group, please add the TrackerRequest keyword to this bug, and suggest title and text for the tracker issue; or you may create a tracker issue yourself, if you are able to do so. For more details, see this document: http://dev.w3.org/html5/decision-policy/decision-policy.html Status: Partially Accepted Change Description: none yet Rationale: This seems reasonable, if we could get definitions of the new composition operators, but we should probably wait until we have the existing composition operators defined and implemented consistently before adding more! 52669 4 mike 2011-08-04 05:03:31 +0000 mass-move component to LC1 64760 5 ian 2012-02-29 20:43:55 +0000 To add this, we need a precise description of what the operators are. See also bug 9307. 64779 6 ian 2012-02-29 22:41:13 +0000 EDITOR'S RESPONSE: This is an Editor's Response to your comment. If you are satisfied with this response, please change the state of this bug to CLOSED. If you have additional information and would like the editor to reconsider, please reopen this bug. If you would like to escalate the issue to the full HTML Working Group, please add the TrackerRequest keyword to this bug, and suggest title and text for the tracker issue; or you may create a tracker issue yourself, if you are able to do so. For more details, see this document: http://dev.w3.org/html5/decision-policy/decision-policy.html Status: Did Not Understand Request Change Description: no spec change Rationale: see comment 5