stylo: Support negative opacity for SMIL

RESOLVED FIXED in Firefox 56

Status

()

P2
normal
RESOLVED FIXED
a year ago
a year ago

People

(Reporter: birtles, Assigned: heycam)

Tracking

(Blocks: 1 bug)

Trunk
mozilla56
Points:
---

Firefox Tracking Flags

(firefox56 fixed)

Details

Attachments

(2 attachments, 1 obsolete attachment)

(Reporter)

Description

a year ago
Created attachment 8875567 [details]
Test case

The attached test case is a reduced test case from a failing test in dom/smil/test/test_smilCSSFromBy.xhtml

The square should fade from opacity 1 to 0 because we have:

  <rect x="20" y="20" width="200" height="200" fill="purple">
    <animate attributeName="opacity" from="1" by="-1" dur="3s"
      fill="freeze" />
  </rect>

However, it doesn't.

When I debug it I see:

  Parsed opacity property value '1' => 1
  Parsed opacity property value '-1' => 0

So it would appear that we are either failing to parse the negative value, or clamping it too early.

As a result we effectively do:

  <animate attributeName="opacity" from="1" by="0" dur="3s"
    fill="freeze" />
Priority: -- → P2
I am leaving comments for someone who are going to fix this bug. 

What we need to do here is:

1) Add a flag that represents that current mode allows all numeric values for converting specified value to computed value
2) Set the flag true in Servo_GetAnimationValues (that is used only for SMIL)
3) Check the flag in Opacity.to_computed_value() and clamp the value only if the flag is false.

Once we allow negative color component (bug 1364279), we also need to change Color.to_computed_value, I guess.
(Assignee)

Updated

a year ago
Assignee: nobody → cam
Status: NEW → ASSIGNED
Comment hidden (mozreview-request)
Comment hidden (mozreview-request)
(Assignee)

Comment 6

a year ago
I didn't add a separate test case, but I checked that the sub-test in dom/smil/test/test_smilCSSFromBy.xhtml started passing.

Comment 7

a year ago
mozreview-review
Comment on attachment 8889331 [details]
Bug 1371150 - Update test expectations.

https://reviewboard.mozilla.org/r/160406/#review165666

Thanks for fixing this!
Attachment #8889331 - Flags: review?(hikezoe) → review+

Comment 8

a year ago
mozreview-review
Comment on attachment 8889332 [details]
Bug 1371150 - style: Don't clamp Opacity values when computing them for SMIL.

https://reviewboard.mozilla.org/r/160408/#review165660
Attachment #8889332 - Flags: review?(hikezoe) → review+
Comment hidden (mozreview-request)
(Assignee)

Updated

a year ago
Attachment #8889332 - Attachment is obsolete: true
(Assignee)

Comment 10

a year ago
mozreview-review
Comment on attachment 8889331 [details]
Bug 1371150 - Update test expectations.

https://reviewboard.mozilla.org/r/160406/#review165688
Attachment #8889331 - Flags: review?(cam) → review+

Comment 12

a year ago
bugherder
https://hg.mozilla.org/mozilla-central/rev/26d556a0f07c
Status: ASSIGNED → RESOLVED
Last Resolved: a year ago
status-firefox56: --- → fixed
Resolution: --- → FIXED
Target Milestone: --- → mozilla56
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