Add DirectWrite font rasterizer

This adds a DirectWrite font rasterizer for Windows and enables
subpixel rendering and hinting.

It also completely replaces rusttype for font rendering on Windows,
allowing Alacritty to use the native font stacks on all operating systems.

Fixes #1673.
Fixes #2316.

1 files changed, 14 insertions, 39 deletions

diff --git a/Cargo.lock b/Cargo.lock
index 98a04aee..67cfe77a 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -445,17 +445,6 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "core-graphics"
-version = "0.14.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "core-foundation 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "foreign-types 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "core-graphics"
 version = "0.17.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
@@ -467,17 +456,6 @@ dependencies = [
 
 [[package]]
 name = "core-text"
-version = "10.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "core-foundation 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "core-graphics 0.14.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "foreign-types 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "core-text"
 version = "13.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
@@ -635,6 +613,18 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
+name = "dwrote"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.90 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.90 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "either"
 version = "1.5.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -788,29 +778,16 @@ dependencies = [
  "core-foundation-sys 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "core-graphics 0.17.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "core-text 13.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "dwrote 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "euclid 0.19.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "font-loader 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "foreign-types 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "freetype-rs 0.19.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "rusttype 0.7.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "servo-fontconfig 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
-name = "font-loader"
-version = "0.8.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "core-foundation 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "core-text 10.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
- "servo-fontconfig 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
 name = "foreign-types"
 version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -2898,9 +2875,7 @@ dependencies = [
 "checksum core-foundation 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)" = "25b9e03f145fd4f2bf705e07b900cd41fc636598fe5dc452fd0db1441c3f496d"
 "checksum core-foundation-sys 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)" = "716c271e8613ace48344f723b60b900a93150271e5be206212d052bbc0883efa"
 "checksum core-foundation-sys 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)" = "e7ca8a5221364ef15ce201e8ed2f609fc312682a8f4e0e3d4aa5879764e0fa3b"
-"checksum core-graphics 0.14.0 (registry+https://github.com/rust-lang/crates.io-index)" = "e54c4ab33705fa1fc8af375bb7929d68e1c1546c1ecef408966d8c3e49a1d84a"
 "checksum core-graphics 0.17.3 (registry+https://github.com/rust-lang/crates.io-index)" = "56790968ab1c8a1202a102e6de05fc6e1ec87da99e4e93e9a7d13efbfc1e95a9"
-"checksum core-text 10.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "81f59bff773954e5cd058a3f5983406b52bec7cc65202bef340ba64a0c40ac91"
 "checksum core-text 13.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d95a72b5e50e549969dd88eff3047495fe5b8c6f028635442c2b708be707e669"
 "checksum crc 1.8.1 (registry+https://github.com/rust-lang/crates.io-index)" = "d663548de7f5cca343f1e0a48d14dcfb0e9eb4e079ec58883b7251539fa10aeb"
 "checksum crc32fast 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ba125de2af0df55319f41944744ad91c71113bf74a4646efff39afe1f6842db1"
@@ -2919,6 +2894,7 @@ dependencies = [
 "checksum downcast-rs 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)" = "f2b92dfd5c2f75260cbf750572f95d387e7ca0ba5e3fbe9e1a33f23025be020f"
 "checksum dtoa 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)" = "6d301140eb411af13d3115f9a562c85cc6b541ade9dfa314132244aaee7489dd"
 "checksum dunce 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d0ad6bf6a88548d1126045c413548df1453d9be094a8ab9fd59bf1fdd338da4f"
+"checksum dwrote 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = "0bd1369e02db5e9b842a9b67bce8a2fcc043beafb2ae8a799dd482d46ea1ff0d"
 "checksum either 1.5.2 (registry+https://github.com/rust-lang/crates.io-index)" = "5527cfe0d098f36e3f8839852688e63c8fff1c90b2b405aef730615f9a7bcf7b"
 "checksum embed-resource 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ee11dd277e159f3a7845341f8c800899cf918a366956e31dd52f35eff638a403"
 "checksum encoding_rs 0.8.17 (registry+https://github.com/rust-lang/crates.io-index)" = "4155785c79f2f6701f185eb2e6b4caf0555ec03477cb4c70db67b465311620ed"
@@ -2935,7 +2911,6 @@ dependencies = [
 "checksum filetime 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)" = "a2df5c1a8c4be27e7707789dc42ae65976e60b394afd293d1419ab915833e646"
 "checksum flate2 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)" = "f87e68aa82b2de08a6e037f1385455759df6e445a8df5e005b4297191dbf18aa"
 "checksum fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)" = "2fad85553e09a6f881f739c29f0b00b0f01357c743266d478b68951ce23285f3"
-"checksum font-loader 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "4ece0e8a5dd99a65f8de977b4a3f89e3b5a5259e15ae610952cdb894e96f5e2e"
 "checksum foreign-types 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)" = "f6f339eb8adc052cd2ca78910fda869aefa38d22d5cb648e6485e4d3fc06f3b1"
 "checksum foreign-types-shared 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "00b0228411908ca8685dba7fc2cdd70ec9990a6e753e89b6ac91a84c40fbaf4b"
 "checksum freetype-rs 0.19.1 (registry+https://github.com/rust-lang/crates.io-index)" = "28cc92a7040ee7b631e4279e263f9a83aedc1eb6085c68d8ca4d072b5644e705"