Tim van der Meij c35bbd11b0

Use native Math functions in the custom log2 function ...

It is quite confusing that the custom function is called `log2` while it
actually returns the ceiling value and handles zero and negative values
differently than the native function.

To resolve this, we add a comment that explains these differences and
make the function use the native `Math` functions internally instead of
using our own custom logic. To verify that the function does what we
expect, we add unit tests.

All browsers except for IE support `Math.log2` for quite a long time
already (see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/log2).
For IE, we use the core-js polyfill.

According to the microbenchmark at https://jsperf.com/log2-pdfjs/1,
using the native functions should also be faster, in my testing almost
six times as fast.

2017-12-10 16:35:17 +01:00

..

cffStandardStrings.js

Fix errors reported by the comma-spacing ESLint rule

2016-12-12 20:35:53 +01:00

compatibility.js

Use native Math functions in the custom log2 function

2017-12-10 16:35:17 +01:00

fonts_utils.js

Removes error()

2017-07-07 09:40:24 -05:00

global_scope.js

Moves global scope out of shared/util.

2017-08-22 18:20:52 -05:00

streams_polyfill.js

Checks Edge support for streams.

2017-08-03 08:48:51 -05:00

util.js

Use native Math functions in the custom log2 function

2017-12-10 16:35:17 +01:00