Add Allsorts engine

Author: wezm

README.md

@@ -7,10 +7,10 @@ display text, so we founded this project to help implementations to
 get this right.
 
 ```bash
-$ brew install cmake ninja npm
+$ brew install cmake ninja npm rust
 $ git clone --recursive https://github.com/unicode-org/text-rendering-tests.git
 $ cd text-rendering-tests
-$ for engine in CoreText FreeStack TehreerStack fontkit OpenType.js ; do python check.py --engine=$engine --output=reports/$engine.html  ; done
+$ for engine in CoreText FreeStack TehreerStack fontkit OpenType.js Allsorts ; do python check.py --engine=$engine --output=reports/$engine.html ; done
 ```
 
 
@@ -43,6 +43,10 @@ text rendering stack consisting of [FreeType](https://www.freetype.org/),
 * With `--engine=OpenType.js`, the tests are run using [OpenType.js](https://github.com/nodebox/opentype.js), another JavaScript font engine.
 — [Test report for OpenType.js](https://rawgit.com/unicode-org/text-rendering-tests/master/reports/OpenType.js.html).
 
+* With `--engine=Allsorts`, the tests are run using [Allsorts](https://github.com/yeslogic/allsorts),
+  a parsing and shaping engine implemented in [Rust](https://www.rust-lang.org/).
+— [Test report for Allsorts](https://rawgit.com/unicode-org/text-rendering-tests/master/reports/Allsorts.html).
+
 It’s trivial to test other implementations; simply write a small
 wrapper tool. For the [Go font
 library](https://godoc.org/golang.org/x/image/font/sfnt), see

check.py

@@ -36,6 +36,8 @@ def __init__(self, engine):
             self.command = 'node_modules/opentype.js/bin/test-render'
         elif self.engine == 'fontkit':
             self.command = 'src/third_party/fontkit/render'
+        elif self.engine == 'Allsorts':
+            self.command = 'src/third_party/allsorts/allsorts-tools/target/release/allsorts'
         else:
             self.command = 'build/fonttest/fonttest'
         self.datestr = self.make_datestr()
@@ -44,7 +46,7 @@ def __init__(self, engine):
         self.observed = {}  # testcase --> SVG ElementTree
 
     def get_version(self):
-        if self.engine in {'CoreText', 'FreeStack', 'TehreerStack'}:
+        if self.engine in {'CoreText', 'FreeStack', 'TehreerStack', 'Allsorts'}:
             return subprocess.check_output([self.command, '--version',
                                             '--engine=' + self.engine])
         if self.engine in ('OpenType.js', 'fontkit'):
@@ -206,6 +208,8 @@ def run_command(cmd, timeout_sec):
 def build(engine):
     if engine == 'OpenType.js' or engine == 'fontkit':
         subprocess.check_call(['npm', 'install'])
+    elif engine == 'Allsorts':
+        subprocess.check_call(['cargo', 'build', '--release', '--manifest-path', 'src/third_party/allsorts/allsorts-tools/Cargo.toml'])
     else:
         if not os.path.exists('build'): os.mkdir('build')
         subprocess.check_call(['cmake', '-GNinja', '../src'], cwd='build')
@@ -217,7 +221,7 @@ def main():
     etree.register_namespace('xlink', 'http://www.w3.org/1999/xlink')
     parser = argparse.ArgumentParser()
     parser.add_argument('--engine',
-                        choices=['FreeStack', 'TehreerStack', 'CoreText', 'DirectWrite', 'OpenType.js', 'fontkit'],
+                        choices=['FreeStack', 'TehreerStack', 'CoreText', 'DirectWrite', 'OpenType.js', 'fontkit', 'Allsorts'],
                         default='FreeStack')
     parser.add_argument('--output', help='path to report file being written')
     args = parser.parse_args()