- From: Timed Text Working Group Issue Tracker <sysbot+tracker@w3.org>
- Date: Mon, 21 Sep 2015 18:22:01 +0000
- To: public-tt@w3.org
ISSUE-432: Multiple layers of background color in HRM [TTML IMSC 1.0] http://www.w3.org/AudioVideo/TT/tracker/issues/432 Raised by: Glenn Adams On product: TTML IMSC 1.0 Does the HRM capture the composited painting requirements for the multiple layers of background colors? i.e., region, body, div, p, and span can all have distinct background colors that must be composited. I ask this because 9.2 steps 2 and 3 seem to imply only two potential background color layers, and not 5 layers as is permitted. The reason they may need to be composited is because each of these 5 layers may specify an alpha component in their color specification. In addition, tts:opacity applies to a region's content as a whole, and tts:color for text foreground can also specify alpha. Overall, that yields 7 possible compositing steps to a presentation buffer (in text profile).
Received on Monday, 21 September 2015 18:22:03 UTC