FiraCode/docs/calt_performance.md

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2020-04-05 21:25:07 +00:00
# Time to shape text with different calt code
Baseline:
```
sub 1 2 3 4 by 1_2_3_4.liga;
```
Spacers:
```
sub 1.spacer 2.spacer 3.spacer 4' by 1_2_3_4.liga;
sub 1.spacer 2.spacer 3' 4 by 3.spacer;
sub 1.spacer 2' 3 4 by 2.spacer;
sub 1' 2 3 4 by 1.spacer;
```
Lookups:
```
lookup 1_2_3_4 {
sub 1.spacer 2.spacer 3.spacer 4' by 1_2_3_4.liga;
sub 1.spacer 2.spacer 3' 4 by 3.spacer;
sub 1.spacer 2' 3 4 by 2.spacer;
sub 1' 2 3 4 by 1.spacer;
} 1_2_3_4;
```
Ignores:
```
lookup 1_2_3_4 {
ignore sub 1 1' 2 3 4;
ignore sub 1' 2 3 4 4;
sub 1.spacer 2.spacer 3.spacer 4' by 1_2_3_4.liga;
sub 1.spacer 2.spacer 3' 4 by 3.spacer;
sub 1.spacer 2' 3 4 by 2.spacer;
sub 1' 2 3 4 by 1.spacer;
} 1_2_3_4;
```
Benchmark:
```
time hb-shape -n 100000 distr/ttf/FiraCode-Regular.ttf "Hello +++ /// !== <-> world"
```
Setup:
```
HarfBuzz 2.6.4
3,2 GHz 6-Core Intel Core i7
MacOS 10.15.3
```
Results:
```
Baseline 0.407s
Spacers 1.415s
Lookups 2.080s
Ignores 2.656s
```