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Bug 541855: Add in the error tolerance before calling the timing function, so that we allow more error for steeper functions, and less error for most. r=dholbert

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This commit is contained in:
L. David Baron 2014-02-14 21:29:12 -08:00
parent e7fb9a0468
commit 37a69f000f
1 changed files with 14 additions and 1 deletions
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15
layout/style/test/test_transitions.html
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@ -430,6 +430,19 @@ function check_transition_value(func, start_time, end_time,
start_value, end_value, cval, desc,
xfail)
{
/**
* Compute the value at a given time |elapsed|, by normalizing the
* input to the timing function using start_time and end_time and
* then turning the output into a value using start_value and
* end_value.
*
* The |error_direction| argument should be either -1, 0, or 1,
* suggesting adding on a little bit of error, to allow for the
* cubic-bezier calculation being an approximation. The amount of
* error is proportional to the slope of the timing function, since
* the error is added to the *input* of the timing function (after
* normalization to 0-1 based on start_time and end_time).
*/
function value_at(elapsed, error_direction) {
var time_portion = (elapsed - start_time) / (end_time - start_time);
if (time_portion < 0)
@ -438,7 +451,7 @@ function check_transition_value(func, start_time, end_time,
time_portion = 1;
// Assume a small error since bezier computation can be off slightly.
// (This test's computation is probably more accurate than Mozilla's.)
var value_portion = func(time_portion) + error_direction * 0.0015;
var value_portion = func(time_portion + error_direction * 0.0005);
if (value_portion < 0)
value_portion = 0;
else if (value_portion > 1)