Auto merge of #23451 - pylbrecht:canvas.rendering, r=Manishearth

Use raqote for 2D canvas rendering

<!-- Please describe your changes on the following line: -->

---
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- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix (part of) #23431 and #23466

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Cargo.lock

@@ -146,7 +146,7 @@ version = "0.36.0"
 source = "git+https://github.com/servo/rust-azure#ca9cc643808f6f63576c5c2cd098e973406cc7f3"
 dependencies = [
  "cmake 0.1.38 (registry+https://github.com/rust-lang/crates.io-index)",
- "euclid 0.19.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "euclid 0.19.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.53 (registry+https://github.com/rust-lang/crates.io-index)",
  "servo-freetype-sys 4.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "servo-skia 0.30000021.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -424,7 +424,7 @@ dependencies = [
  "canvas_traits 0.0.1",
  "compositing 0.0.1",
  "cssparser 0.25.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "euclid 0.19.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "euclid 0.19.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "gleam 0.6.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "half 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -433,6 +433,7 @@ dependencies = [
  "num-traits 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "offscreen_gl_context 0.22.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "pixels 0.0.1",
+ "raqote 0.4.1-alpha.0 (git+https://github.com/jrmuizel/raqote)",
  "serde_bytes 0.10.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "servo_config 0.0.1",
  "webrender 0.60.0 (git+https://github.com/servo/webrender)",
@@ -444,7 +445,7 @@ name = "canvas_traits"
 version = "0.0.1"
 dependencies = [
  "cssparser 0.25.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "euclid 0.19.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "euclid 0.19.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "gleam 0.6.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "ipc-channel 0.11.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -621,7 +622,7 @@ version = "0.0.1"
 dependencies = [
  "crossbeam-channel 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "embedder_traits 0.0.1",
- "euclid 0.19.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "euclid 0.19.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "gfx_traits 0.0.1",
  "gleam 0.6.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "image 0.21.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -661,7 +662,7 @@ dependencies = [
  "debugger 0.0.1",
  "devtools_traits 0.0.1",
  "embedder_traits 0.0.1",
- "euclid 0.19.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "euclid 0.19.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "gaol 0.2.0 (git+https://github.com/servo/gaol)",
  "gfx 0.0.1",
  "gfx_traits 0.0.1",
@@ -721,7 +722,7 @@ dependencies = [
 
 [[package]]
 name = "core-text"
-version = "13.1.0"
+version = "13.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "core-foundation 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1102,6 +1103,16 @@ dependencies = [
  "winapi 0.3.6 (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 0.2.53 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "either"
 version = "1.1.0"
@@ -1215,7 +1226,7 @@ dependencies = [
 
 [[package]]
 name = "euclid"
-version = "0.19.7"
+version = "0.19.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "euclid_macros 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1244,7 +1255,7 @@ dependencies = [
 
 [[package]]
 name = "failure"
-version = "0.1.3"
+version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "backtrace 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1278,11 +1289,40 @@ dependencies = [
  "miniz_oxide_c_api 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "float-ord"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "fnv"
 version = "1.0.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "font-kit"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "byteorder 1.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "core-foundation 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)",
+ "dirs 1.0.2 (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)",
+ "float-ord 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "freetype 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.53 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lyon_path 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "memmap 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "servo-fontconfig 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "walkdir 2.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "fontsan"
 version = "0.4.0"
@@ -1308,7 +1348,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "freetype"
-version = "0.4.0"
+version = "0.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "libc 0.2.53 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1405,12 +1445,12 @@ dependencies = [
  "byteorder 1.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "core-foundation 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 13.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "core-text 13.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "dwrote 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "euclid 0.19.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "euclid 0.19.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "fontsan 0.4.0 (git+https://github.com/servo/fontsan)",
- "freetype 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "freetype 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "gfx_traits 0.0.1",
  "harfbuzz-sys 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "ipc-channel 0.11.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1893,9 +1933,9 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cmake 0.1.38 (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 13.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "core-text 13.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "foreign-types 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "freetype 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "freetype 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "pkg-config 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -2265,7 +2305,7 @@ dependencies = [
  "canvas_traits 0.0.1",
  "crossbeam-channel 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "embedder_traits 0.0.1",
- "euclid 0.19.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "euclid 0.19.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "fxhash 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "gfx 0.0.1",
@@ -2311,7 +2351,7 @@ dependencies = [
  "atomic_refcell 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "crossbeam-channel 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "embedder_traits 0.0.1",
- "euclid 0.19.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "euclid 0.19.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "fxhash 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "gfx 0.0.1",
@@ -2449,7 +2489,7 @@ dependencies = [
  "devtools_traits 0.0.1",
  "embedder_traits 0.0.1",
  "env_logger 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "euclid 0.19.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "euclid 0.19.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "gaol 0.2.0 (git+https://github.com/servo/gaol)",
  "gfx 0.0.1",
  "gleam 0.6.16 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2537,6 +2577,24 @@ dependencies = [
  "cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "lyon_geom"
+version = "0.12.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "arrayvec 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "euclid 0.19.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-traits 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "lyon_path"
+version = "0.12.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "lyon_geom 0.12.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "lzw"
 version = "0.10.0"
@@ -2570,7 +2628,7 @@ dependencies = [
  "app_units 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "crossbeam-channel 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "cssparser 0.25.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "euclid 0.19.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "euclid 0.19.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "hashglobe 0.1.0",
  "hyper 0.12.14 (registry+https://github.com/rust-lang/crates.io-index)",
  "hyper_serde 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2634,6 +2692,15 @@ name = "memchr"
 version = "2.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "memmap"
+version = "0.6.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "libc 0.2.53 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "memmap"
 version = "0.7.0"
@@ -3061,7 +3128,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cgl 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "core-foundation 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "euclid 0.19.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "euclid 0.19.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "gl_generator 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "gleam 0.6.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3255,7 +3322,7 @@ dependencies = [
 name = "pixels"
 version = "0.0.1"
 dependencies = [
- "euclid 0.19.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "euclid 0.19.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "malloc_size_of 0.0.1",
  "malloc_size_of_derive 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.80 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3272,7 +3339,7 @@ version = "0.13.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "binary-space-partition 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "euclid 0.19.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "euclid 0.19.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "num-traits 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -3500,6 +3567,19 @@ dependencies = [
  "serde 1.0.80 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "raqote"
+version = "0.4.1-alpha.0"
+source = "git+https://github.com/jrmuizel/raqote#15748d146466bc1db09699fe149cc760b81cdf60"
+dependencies = [
+ "euclid 0.19.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "font-kit 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lyon_geom 0.12.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "png 0.14.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "sw-composite 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "typed-arena 1.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "rayon"
 version = "1.0.0"
@@ -3593,7 +3673,7 @@ version = "0.11.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bindgen 0.49.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "euclid 0.19.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "euclid 0.19.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "gl_generator 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "gleam 0.6.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "glutin 0.21.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3699,7 +3779,7 @@ dependencies = [
  "embedder_traits 0.0.1",
  "encoding_rs 0.8.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "enum-iterator 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "euclid 0.19.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "euclid 0.19.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "gleam 0.6.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "headers-core 0.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3777,7 +3857,7 @@ dependencies = [
  "canvas_traits 0.0.1",
  "crossbeam-channel 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "cssparser 0.25.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "euclid 0.19.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "euclid 0.19.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "gfx_traits 0.0.1",
  "html5ever 0.23.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "ipc-channel 0.11.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3817,7 +3897,7 @@ dependencies = [
 name = "script_tests"
 version = "0.0.1"
 dependencies = [
- "euclid 0.19.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "euclid 0.19.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "keyboard-types 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "script 0.0.1",
  "servo_url 0.0.1",
@@ -3833,7 +3913,7 @@ dependencies = [
  "crossbeam-channel 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "devtools_traits 0.0.1",
  "embedder_traits 0.0.1",
- "euclid 0.19.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "euclid 0.19.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "gfx_traits 0.0.1",
  "http 0.1.14 (registry+https://github.com/rust-lang/crates.io-index)",
  "hyper 0.12.14 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3935,7 +4015,7 @@ dependencies = [
  "bitflags 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "cc 1.0.35 (registry+https://github.com/rust-lang/crates.io-index)",
  "crossbeam-channel 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "euclid 0.19.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "euclid 0.19.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "gleam 0.6.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "glutin 0.21.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "image 0.21.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -4009,7 +4089,7 @@ source = "git+https://github.com/servo/media#2dabf1ab7e3b6d3b6764eebdf8855431367
 dependencies = [
  "boxfnonce 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "byte-slice-cast 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "euclid 0.19.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "euclid 0.19.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "num-traits 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "petgraph 0.4.13 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.80 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -4126,7 +4206,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cgl 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "cmake 0.1.38 (registry+https://github.com/rust-lang/crates.io-index)",
- "euclid 0.19.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "euclid 0.19.8 (registry+https://github.com/rust-lang/crates.io-index)",
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- "euclid 0.19.7 (registry+https://github.com/rust-lang/crates.io-index)",
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@@ -4201,7 +4281,7 @@ name = "servo_geometry"
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- "euclid 0.19.7 (registry+https://github.com/rust-lang/crates.io-index)",
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  "malloc_size_of_derive 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
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- "euclid 0.19.7 (registry+https://github.com/rust-lang/crates.io-index)",
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@@ -4537,7 +4617,7 @@ dependencies = [
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- "euclid 0.19.7 (registry+https://github.com/rust-lang/crates.io-index)",
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@@ -4574,6 +4654,11 @@ dependencies = [
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+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
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@@ -4910,6 +4995,11 @@ name = "try-lock"
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 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "typed-arena"
+version = "1.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
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- "euclid 0.19.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "euclid 0.19.8 (registry+https://github.com/rust-lang/crates.io-index)",
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- "euclid 0.19.7 (registry+https://github.com/rust-lang/crates.io-index)",
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@@ -5295,7 +5385,7 @@ name = "which"
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 dependencies = [
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+ "failure 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
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+ "euclid 0.19.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
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@@ -5579,18 +5670,20 @@ dependencies = [
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@@ -5695,6 +5790,7 @@ dependencies = [
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@@ -5770,6 +5866,7 @@ dependencies = [
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@@ -5833,6 +5930,7 @@ dependencies = [
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 "checksum swapper 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "e454d048db5527d000bfddb77bd072bbf3a1e2ae785f16d9bd116e07c2ab45eb"
 "checksum syn 0.15.34 (registry+https://github.com/rust-lang/crates.io-index)" = "a1393e4a97a19c01e900df2aec855a29f71cf02c402e2f443b8d2747c25c5dbe"
 "checksum synstructure 0.10.1 (registry+https://github.com/rust-lang/crates.io-index)" = "73687139bf99285483c96ac0add482c3776528beac1d97d444f6e91f203a2015"
@@ -5864,6 +5962,7 @@ dependencies = [
 "checksum toml 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)" = "a7540f4ffc193e0d3c94121edb19b055670d369f77d5804db11ae053a45b6e7e"
 "checksum truetype 0.26.0 (registry+https://github.com/rust-lang/crates.io-index)" = "acec30350633d6dac9dc1a625786b6cbe9150664be941aac2c35ad7199eab877"
 "checksum try-lock 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "e604eb7b43c06650e854be16a2a03155743d3752dd1c943f6829e26b7a36e382"
+"checksum typed-arena 1.4.1 (registry+https://github.com/rust-lang/crates.io-index)" = "c6c06a92aef38bb4dc5b0df00d68496fc31307c5344c867bb61678c6e1671ec5"
 "checksum typenum 1.10.0 (registry+https://github.com/rust-lang/crates.io-index)" = "612d636f949607bdf9b123b4a6f6d966dedf3ff669f7f045890d3a4a73948169"
 "checksum ucd 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "fe4fa6e588762366f1eb4991ce59ad1b93651d0b769dfb4e4d1c5c4b943d1159"
 "checksum ucd-util 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "fd2be2d6639d0f8fe6cdda291ad456e23629558d466e2789d2c3e9892bda285d"

components/canvas/Cargo.toml

@@ -11,10 +11,13 @@ name = "canvas"
 path = "lib.rs"
 
 [features]
+azure_backend = ["azure"]
+default = ["azure_backend"]
 webgl_backtrace = ["canvas_traits/webgl_backtrace"]
+raqote_backend = ["raqote"]
 
 [dependencies]
-azure = {git = "https://github.com/servo/rust-azure"}
+azure = {git = "https://github.com/servo/rust-azure", optional = true}
 byteorder = "1"
 canvas_traits = {path = "../canvas_traits"}
 compositing = {path = "../compositing"}
@@ -27,6 +30,7 @@ ipc-channel = "0.11"
 log = "0.4"
 num-traits = "0.2"
 offscreen_gl_context = {version = "0.22", features = ["serde", "osmesa"]}
+raqote = {git = "https://github.com/jrmuizel/raqote", optional = true}
 pixels = {path = "../pixels"}
 serde_bytes = "0.10"
 servo_config = {path = "../config"}

components/canvas/azure_backend.rs

@@ -0,0 +1,761 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+use crate::canvas_data::{
+    Backend, CanvasPaintState, Color, CompositionOp, DrawOptions, ExtendMode, Filter,
+    GenericDrawTarget, GenericPathBuilder, GradientStop, GradientStops, Path, Pattern,
+    SourceSurface, StrokeOptions, SurfaceFormat,
+};
+use crate::canvas_paint_thread::AntialiasMode;
+use azure::azure::{AzFloat, AzGradientStop, AzPoint};
+use azure::azure_hl;
+use azure::azure_hl::SurfacePattern;
+use azure::azure_hl::{BackendType, ColorPattern, DrawTarget};
+use azure::azure_hl::{CapStyle, JoinStyle};
+use azure::azure_hl::{LinearGradientPattern, RadialGradientPattern};
+use canvas_traits::canvas::*;
+use cssparser::RGBA;
+use euclid::{Point2D, Rect, Size2D, Transform2D, Vector2D};
+
+pub struct AzureBackend;
+
+impl Backend for AzureBackend {
+    fn get_composition_op(&self, opts: &DrawOptions) -> CompositionOp {
+        CompositionOp::Azure(opts.as_azure().composition)
+    }
+
+    fn need_to_draw_shadow(&self, color: &Color) -> bool {
+        color.as_azure().a != 0.0f32
+    }
+
+    fn size_from_pattern(&self, rect: &Rect<f32>, pattern: &Pattern) -> Option<Size2D<f32>> {
+        match pattern {
+            Pattern::Azure(azure_hl::Pattern::Surface(ref surface)) => {
+                let surface_size = surface.size();
+                let size = match (surface.repeat_x, surface.repeat_y) {
+                    (true, true) => rect.size,
+                    (true, false) => Size2D::new(rect.size.width, surface_size.height as f32),
+                    (false, true) => Size2D::new(surface_size.width as f32, rect.size.height),
+                    (false, false) => {
+                        Size2D::new(surface_size.width as f32, surface_size.height as f32)
+                    },
+                };
+                Some(size)
+            },
+            Pattern::Azure(_) => None,
+        }
+    }
+
+    fn set_shadow_color<'a>(&mut self, color: RGBA, state: &mut CanvasPaintState<'a>) {
+        state.shadow_color = Color::Azure(color.to_azure_style());
+    }
+
+    fn set_fill_style<'a>(
+        &mut self,
+        style: FillOrStrokeStyle,
+        state: &mut CanvasPaintState<'a>,
+        drawtarget: &GenericDrawTarget,
+    ) {
+        if let Some(pattern) = style.to_azure_pattern(drawtarget) {
+            state.fill_style = Pattern::Azure(pattern)
+        }
+    }
+
+    fn set_stroke_style<'a>(
+        &mut self,
+        style: FillOrStrokeStyle,
+        state: &mut CanvasPaintState<'a>,
+        drawtarget: &GenericDrawTarget,
+    ) {
+        if let Some(pattern) = style.to_azure_pattern(drawtarget) {
+            state.stroke_style = Pattern::Azure(pattern)
+        }
+    }
+
+    fn set_global_composition<'a>(
+        &mut self,
+        op: CompositionOrBlending,
+        state: &mut CanvasPaintState<'a>,
+    ) {
+        state
+            .draw_options
+            .as_azure_mut()
+            .set_composition_op(op.to_azure_style());
+    }
+
+    fn create_drawtarget(&self, size: Size2D<u64>) -> Box<GenericDrawTarget> {
+        // FIXME(nox): Why is the size made of i32 values?
+        Box::new(DrawTarget::new(
+            BackendType::Skia,
+            size.to_i32(),
+            azure_hl::SurfaceFormat::B8G8R8A8,
+        ))
+    }
+
+    fn recreate_paint_state<'a>(&self, state: &CanvasPaintState<'a>) -> CanvasPaintState<'a> {
+        CanvasPaintState::new(AntialiasMode::from_azure(
+            state.draw_options.as_azure().antialias,
+        ))
+    }
+}
+
+impl<'a> CanvasPaintState<'a> {
+    pub fn new(antialias: AntialiasMode) -> CanvasPaintState<'a> {
+        CanvasPaintState {
+            draw_options: DrawOptions::Azure(azure_hl::DrawOptions::new(
+                1.0,
+                azure_hl::CompositionOp::Over,
+                antialias.into_azure(),
+            )),
+            fill_style: Pattern::Azure(azure_hl::Pattern::Color(ColorPattern::new(
+                azure_hl::Color::black(),
+            ))),
+            stroke_style: Pattern::Azure(azure_hl::Pattern::Color(ColorPattern::new(
+                azure_hl::Color::black(),
+            ))),
+            stroke_opts: StrokeOptions::Azure(azure_hl::StrokeOptions::new(
+                1.0,
+                JoinStyle::MiterOrBevel,
+                CapStyle::Butt,
+                10.0,
+                &[],
+            )),
+            transform: Transform2D::identity(),
+            shadow_offset_x: 0.0,
+            shadow_offset_y: 0.0,
+            shadow_blur: 0.0,
+            shadow_color: Color::Azure(azure_hl::Color::transparent()),
+        }
+    }
+}
+
+impl GenericPathBuilder for azure_hl::PathBuilder {
+    fn arc(
+        &self,
+        origin: Point2D<f32>,
+        radius: f32,
+        start_angle: f32,
+        end_angle: f32,
+        anticlockwise: bool,
+    ) {
+        self.arc(
+            origin as Point2D<AzFloat>,
+            radius as AzFloat,
+            start_angle as AzFloat,
+            end_angle as AzFloat,
+            anticlockwise,
+        );
+    }
+    fn bezier_curve_to(
+        &self,
+        control_point1: &Point2D<f32>,
+        control_point2: &Point2D<f32>,
+        control_point3: &Point2D<f32>,
+    ) {
+        self.bezier_curve_to(
+            control_point1 as &Point2D<AzFloat>,
+            control_point2 as &Point2D<AzFloat>,
+            control_point3 as &Point2D<AzFloat>,
+        );
+    }
+    fn close(&self) {
+        self.close();
+    }
+    fn ellipse(
+        &self,
+        origin: Point2D<f32>,
+        radius_x: f32,
+        radius_y: f32,
+        rotation_angle: f32,
+        start_angle: f32,
+        end_angle: f32,
+        anticlockwise: bool,
+    ) {
+        self.ellipse(
+            origin as Point2D<AzFloat>,
+            radius_x as AzFloat,
+            radius_y as AzFloat,
+            rotation_angle as AzFloat,
+            start_angle as AzFloat,
+            end_angle as AzFloat,
+            anticlockwise,
+        );
+    }
+    fn get_current_point(&self) -> Point2D<f32> {
+        let AzPoint { x, y } = self.get_current_point();
+        Point2D::new(x as f32, y as f32)
+    }
+    fn line_to(&self, point: Point2D<f32>) {
+        self.line_to(point as Point2D<AzFloat>);
+    }
+    fn move_to(&self, point: Point2D<f32>) {
+        self.move_to(point as Point2D<AzFloat>);
+    }
+    fn quadratic_curve_to(&self, control_point: &Point2D<f32>, end_point: &Point2D<f32>) {
+        self.quadratic_curve_to(
+            control_point as &Point2D<AzFloat>,
+            end_point as &Point2D<AzFloat>,
+        );
+    }
+    fn finish(&self) -> Path {
+        Path::Azure(self.finish())
+    }
+}
+
+impl GenericDrawTarget for azure_hl::DrawTarget {
+    fn clear_rect(&self, rect: &Rect<f32>) {
+        self.clear_rect(rect as &Rect<AzFloat>);
+    }
+
+    fn copy_surface(&self, surface: SourceSurface, source: Rect<i32>, destination: Point2D<i32>) {
+        self.copy_surface(surface.into_azure(), source, destination);
+    }
+
+    fn create_gradient_stops(
+        &self,
+        gradient_stops: Vec<GradientStop>,
+        extend_mode: ExtendMode,
+    ) -> GradientStops {
+        let gradient_stops: Vec<AzGradientStop> =
+            gradient_stops.into_iter().map(|x| x.into_azure()).collect();
+        GradientStops::Azure(self.create_gradient_stops(&gradient_stops, extend_mode.into_azure()))
+    }
+
+    fn create_path_builder(&self) -> Box<GenericPathBuilder> {
+        Box::new(self.create_path_builder())
+    }
+
+    fn create_similar_draw_target(
+        &self,
+        size: &Size2D<i32>,
+        format: SurfaceFormat,
+    ) -> Box<GenericDrawTarget> {
+        Box::new(self.create_similar_draw_target(size, format.into_azure()))
+    }
+    fn create_source_surface_from_data(
+        &self,
+        data: &[u8],
+        size: Size2D<i32>,
+        stride: i32,
+    ) -> Option<SourceSurface> {
+        self.create_source_surface_from_data(data, size, stride, azure_hl::SurfaceFormat::B8G8R8A8)
+            .map(|s| SourceSurface::Azure(s))
+    }
+    fn draw_surface(
+        &self,
+        surface: SourceSurface,
+        dest: Rect<f64>,
+        source: Rect<f64>,
+        filter: Filter,
+        draw_options: &DrawOptions,
+    ) {
+        let surf_options = azure_hl::DrawSurfaceOptions::new(filter.as_azure(), true);
+        let draw_options = azure_hl::DrawOptions::new(
+            draw_options.as_azure().alpha,
+            draw_options.as_azure().composition,
+            azure_hl::AntialiasMode::None,
+        );
+        self.draw_surface(
+            surface.into_azure(),
+            dest.to_azure_style(),
+            source.to_azure_style(),
+            surf_options,
+            draw_options,
+        );
+    }
+    fn draw_surface_with_shadow(
+        &self,
+        surface: SourceSurface,
+        dest: &Point2D<f32>,
+        color: &Color,
+        offset: &Vector2D<f32>,
+        sigma: f32,
+        operator: CompositionOp,
+    ) {
+        self.draw_surface_with_shadow(
+            surface.into_azure(),
+            dest as &Point2D<AzFloat>,
+            color.as_azure(),
+            offset as &Vector2D<AzFloat>,
+            sigma as AzFloat,
+            operator.into_azure(),
+        );
+    }
+    fn fill(&self, path: &Path, pattern: Pattern, draw_options: &DrawOptions) {
+        self.fill(
+            path.as_azure(),
+            pattern.as_azure().to_pattern_ref(),
+            draw_options.as_azure(),
+        );
+    }
+    fn fill_rect(&self, rect: &Rect<f32>, pattern: Pattern, draw_options: Option<&DrawOptions>) {
+        self.fill_rect(
+            rect as &Rect<AzFloat>,
+            pattern.as_azure().to_pattern_ref(),
+            draw_options.map(|x| x.as_azure()),
+        );
+    }
+    fn get_format(&self) -> SurfaceFormat {
+        SurfaceFormat::Azure(self.get_format())
+    }
+    fn get_size(&self) -> Size2D<i32> {
+        let size = self.get_size();
+        Size2D::new(size.width, size.height)
+    }
+    fn get_transform(&self) -> Transform2D<f32> {
+        self.get_transform() as Transform2D<f32>
+    }
+    fn pop_clip(&self) {
+        self.pop_clip();
+    }
+    fn push_clip(&self, path: &Path) {
+        self.push_clip(path.as_azure());
+    }
+    fn set_transform(&self, matrix: &Transform2D<f32>) {
+        self.set_transform(matrix as &Transform2D<AzFloat>);
+    }
+    fn snapshot(&self) -> SourceSurface {
+        SourceSurface::Azure(self.snapshot())
+    }
+    fn stroke(
+        &self,
+        path: &Path,
+        pattern: Pattern,
+        stroke_options: &StrokeOptions,
+        draw_options: &DrawOptions,
+    ) {
+        self.stroke(
+            path.as_azure(),
+            pattern.as_azure().to_pattern_ref(),
+            stroke_options.as_azure(),
+            draw_options.as_azure(),
+        );
+    }
+    fn stroke_line(
+        &self,
+        start: Point2D<f32>,
+        end: Point2D<f32>,
+        pattern: Pattern,
+        stroke_options: &StrokeOptions,
+        draw_options: &DrawOptions,
+    ) {
+        let stroke_options = stroke_options.as_azure();
+        let cap = match stroke_options.line_join {
+            JoinStyle::Round => CapStyle::Round,
+            _ => CapStyle::Butt,
+        };
+
+        let stroke_opts = azure_hl::StrokeOptions::new(
+            stroke_options.line_width,
+            stroke_options.line_join,
+            cap,
+            stroke_options.miter_limit,
+            stroke_options.mDashPattern,
+        );
+
+        self.stroke_line(
+            start,
+            end,
+            pattern.as_azure().to_pattern_ref(),
+            &stroke_opts,
+            draw_options.as_azure(),
+        );
+    }
+    fn stroke_rect(
+        &self,
+        rect: &Rect<f32>,
+        pattern: Pattern,
+        stroke_options: &StrokeOptions,
+        draw_options: &DrawOptions,
+    ) {
+        self.stroke_rect(
+            rect as &Rect<AzFloat>,
+            pattern.as_azure().to_pattern_ref(),
+            stroke_options.as_azure(),
+            draw_options.as_azure(),
+        );
+    }
+
+    #[allow(unsafe_code)]
+    fn snapshot_data(&self, f: &Fn(&[u8]) -> Vec<u8>) -> Vec<u8> {
+        unsafe { f(self.snapshot().get_data_surface().data()) }
+    }
+
+    #[allow(unsafe_code)]
+    fn snapshot_data_owned(&self) -> Vec<u8> {
+        unsafe { self.snapshot().get_data_surface().data().into() }
+    }
+}
+
+impl AntialiasMode {
+    fn into_azure(self) -> azure_hl::AntialiasMode {
+        match self {
+            AntialiasMode::Default => azure_hl::AntialiasMode::Default,
+            AntialiasMode::None => azure_hl::AntialiasMode::None,
+        }
+    }
+
+    fn from_azure(val: azure_hl::AntialiasMode) -> AntialiasMode {
+        match val {
+            azure_hl::AntialiasMode::Default => AntialiasMode::Default,
+            azure_hl::AntialiasMode::None => AntialiasMode::None,
+            v => unimplemented!("{:?} is unsupported", v),
+        }
+    }
+}
+
+impl ExtendMode {
+    fn into_azure(self) -> azure_hl::ExtendMode {
+        match self {
+            ExtendMode::Azure(m) => m,
+        }
+    }
+}
+
+impl GradientStop {
+    fn into_azure(self) -> AzGradientStop {
+        match self {
+            GradientStop::Azure(s) => s,
+        }
+    }
+}
+
+impl GradientStops {
+    fn into_azure(self) -> azure_hl::GradientStops {
+        match self {
+            GradientStops::Azure(s) => s,
+        }
+    }
+}
+
+impl Color {
+    fn as_azure(&self) -> &azure_hl::Color {
+        match self {
+            Color::Azure(s) => s,
+        }
+    }
+}
+
+impl CompositionOp {
+    fn into_azure(self) -> azure_hl::CompositionOp {
+        match self {
+            CompositionOp::Azure(s) => s,
+        }
+    }
+}
+
+impl SurfaceFormat {
+    fn into_azure(self) -> azure_hl::SurfaceFormat {
+        match self {
+            SurfaceFormat::Azure(s) => s,
+        }
+    }
+}
+
+impl SourceSurface {
+    fn into_azure(self) -> azure_hl::SourceSurface {
+        match self {
+            SourceSurface::Azure(s) => s,
+        }
+    }
+}
+
+impl Path {
+    fn as_azure(&self) -> &azure_hl::Path {
+        match self {
+            Path::Azure(p) => p,
+        }
+    }
+}
+
+impl Pattern {
+    fn as_azure(&self) -> &azure_hl::Pattern {
+        match self {
+            Pattern::Azure(p) => p,
+        }
+    }
+}
+
+impl DrawOptions {
+    fn as_azure(&self) -> &azure_hl::DrawOptions {
+        match self {
+            DrawOptions::Azure(options) => options,
+        }
+    }
+    fn as_azure_mut(&mut self) -> &mut azure_hl::DrawOptions {
+        match self {
+            DrawOptions::Azure(options) => options,
+        }
+    }
+    pub fn set_alpha(&mut self, val: f32) {
+        match self {
+            DrawOptions::Azure(options) => options.alpha = val as AzFloat,
+        }
+    }
+}
+
+impl<'a> StrokeOptions<'a> {
+    pub fn as_azure(&self) -> &azure_hl::StrokeOptions<'a> {
+        match self {
+            StrokeOptions::Azure(options) => options,
+        }
+    }
+    pub fn set_line_width(&mut self, val: f32) {
+        match self {
+            StrokeOptions::Azure(options) => options.line_width = val as AzFloat,
+        }
+    }
+    pub fn set_miter_limit(&mut self, val: f32) {
+        match self {
+            StrokeOptions::Azure(options) => options.miter_limit = val as AzFloat,
+        }
+    }
+    pub fn set_line_join(&mut self, val: LineJoinStyle) {
+        match self {
+            StrokeOptions::Azure(options) => options.line_join = val.to_azure_style(),
+        }
+    }
+    pub fn set_line_cap(&mut self, val: LineCapStyle) {
+        match self {
+            StrokeOptions::Azure(options) => options.line_cap = val.to_azure_style(),
+        }
+    }
+}
+
+pub trait ToAzureStyle {
+    type Target;
+    fn to_azure_style(self) -> Self::Target;
+}
+
+impl ToAzureStyle for Rect<f64> {
+    type Target = Rect<f32>;
+
+    fn to_azure_style(self) -> Rect<f32> {
+        Rect::new(
+            Point2D::new(self.origin.x as f32, self.origin.y as f32),
+            Size2D::new(self.size.width as f32, self.size.height as f32),
+        )
+    }
+}
+
+impl ToAzureStyle for LineCapStyle {
+    type Target = CapStyle;
+
+    fn to_azure_style(self) -> CapStyle {
+        match self {
+            LineCapStyle::Butt => CapStyle::Butt,
+            LineCapStyle::Round => CapStyle::Round,
+            LineCapStyle::Square => CapStyle::Square,
+        }
+    }
+}
+
+impl ToAzureStyle for LineJoinStyle {
+    type Target = JoinStyle;
+
+    fn to_azure_style(self) -> JoinStyle {
+        match self {
+            LineJoinStyle::Round => JoinStyle::Round,
+            LineJoinStyle::Bevel => JoinStyle::Bevel,
+            LineJoinStyle::Miter => JoinStyle::Miter,
+        }
+    }
+}
+
+impl ToAzureStyle for CompositionStyle {
+    type Target = azure_hl::CompositionOp;
+
+    fn to_azure_style(self) -> azure_hl::CompositionOp {
+        match self {
+            CompositionStyle::SrcIn => azure_hl::CompositionOp::In,
+            CompositionStyle::SrcOut => azure_hl::CompositionOp::Out,
+            CompositionStyle::SrcOver => azure_hl::CompositionOp::Over,
+            CompositionStyle::SrcAtop => azure_hl::CompositionOp::Atop,
+            CompositionStyle::DestIn => azure_hl::CompositionOp::DestIn,
+            CompositionStyle::DestOut => azure_hl::CompositionOp::DestOut,
+            CompositionStyle::DestOver => azure_hl::CompositionOp::DestOver,
+            CompositionStyle::DestAtop => azure_hl::CompositionOp::DestAtop,
+            CompositionStyle::Copy => azure_hl::CompositionOp::Source,
+            CompositionStyle::Lighter => azure_hl::CompositionOp::Add,
+            CompositionStyle::Xor => azure_hl::CompositionOp::Xor,
+        }
+    }
+}
+
+impl ToAzureStyle for BlendingStyle {
+    type Target = azure_hl::CompositionOp;
+
+    fn to_azure_style(self) -> azure_hl::CompositionOp {
+        match self {
+            BlendingStyle::Multiply => azure_hl::CompositionOp::Multiply,
+            BlendingStyle::Screen => azure_hl::CompositionOp::Screen,
+            BlendingStyle::Overlay => azure_hl::CompositionOp::Overlay,
+            BlendingStyle::Darken => azure_hl::CompositionOp::Darken,
+            BlendingStyle::Lighten => azure_hl::CompositionOp::Lighten,
+            BlendingStyle::ColorDodge => azure_hl::CompositionOp::ColorDodge,
+            BlendingStyle::ColorBurn => azure_hl::CompositionOp::ColorBurn,
+            BlendingStyle::HardLight => azure_hl::CompositionOp::HardLight,
+            BlendingStyle::SoftLight => azure_hl::CompositionOp::SoftLight,
+            BlendingStyle::Difference => azure_hl::CompositionOp::Difference,
+            BlendingStyle::Exclusion => azure_hl::CompositionOp::Exclusion,
+            BlendingStyle::Hue => azure_hl::CompositionOp::Hue,
+            BlendingStyle::Saturation => azure_hl::CompositionOp::Saturation,
+            BlendingStyle::Color => azure_hl::CompositionOp::Color,
+            BlendingStyle::Luminosity => azure_hl::CompositionOp::Luminosity,
+        }
+    }
+}
+
+impl ToAzureStyle for CompositionOrBlending {
+    type Target = azure_hl::CompositionOp;
+
+    fn to_azure_style(self) -> azure_hl::CompositionOp {
+        match self {
+            CompositionOrBlending::Composition(op) => op.to_azure_style(),
+            CompositionOrBlending::Blending(op) => op.to_azure_style(),
+        }
+    }
+}
+
+pub trait ToAzurePattern {
+    fn to_azure_pattern(&self, drawtarget: &GenericDrawTarget) -> Option<azure_hl::Pattern>;
+}
+
+impl ToAzurePattern for FillOrStrokeStyle {
+    fn to_azure_pattern(&self, drawtarget: &GenericDrawTarget) -> Option<azure_hl::Pattern> {
+        Some(match *self {
+            FillOrStrokeStyle::Color(ref color) => {
+                azure_hl::Pattern::Color(ColorPattern::new(color.to_azure_style()))
+            },
+            FillOrStrokeStyle::LinearGradient(ref linear_gradient_style) => {
+                let gradient_stops: Vec<GradientStop> = linear_gradient_style
+                    .stops
+                    .iter()
+                    .map(|s| {
+                        GradientStop::Azure(azure_hl::GradientStop {
+                            offset: s.offset as f32,
+                            color: s.color.to_azure_style(),
+                        })
+                    })
+                    .collect();
+
+                azure_hl::Pattern::LinearGradient(LinearGradientPattern::new(
+                    &Point2D::new(
+                        linear_gradient_style.x0 as f32,
+                        linear_gradient_style.y0 as f32,
+                    ),
+                    &Point2D::new(
+                        linear_gradient_style.x1 as f32,
+                        linear_gradient_style.y1 as f32,
+                    ),
+                    drawtarget
+                        .create_gradient_stops(
+                            gradient_stops,
+                            ExtendMode::Azure(azure_hl::ExtendMode::Clamp),
+                        )
+                        .into_azure(),
+                    &Transform2D::identity(),
+                ))
+            },
+            FillOrStrokeStyle::RadialGradient(ref radial_gradient_style) => {
+                let gradient_stops: Vec<GradientStop> = radial_gradient_style
+                    .stops
+                    .iter()
+                    .map(|s| {
+                        GradientStop::Azure(azure_hl::GradientStop {
+                            offset: s.offset as f32,
+                            color: s.color.to_azure_style(),
+                        })
+                    })
+                    .collect();
+
+                azure_hl::Pattern::RadialGradient(RadialGradientPattern::new(
+                    &Point2D::new(
+                        radial_gradient_style.x0 as f32,
+                        radial_gradient_style.y0 as f32,
+                    ),
+                    &Point2D::new(
+                        radial_gradient_style.x1 as f32,
+                        radial_gradient_style.y1 as f32,
+                    ),
+                    radial_gradient_style.r0 as f32,
+                    radial_gradient_style.r1 as f32,
+                    drawtarget
+                        .create_gradient_stops(
+                            gradient_stops,
+                            ExtendMode::Azure(azure_hl::ExtendMode::Clamp),
+                        )
+                        .into_azure(),
+                    &Transform2D::identity(),
+                ))
+            },
+            FillOrStrokeStyle::Surface(ref surface_style) => {
+                let source_surface = drawtarget
+                    .create_source_surface_from_data(
+                        &surface_style.surface_data,
+                        // FIXME(nox): Why are those i32 values?
+                        surface_style.surface_size.to_i32(),
+                        surface_style.surface_size.width as i32 * 4,
+                    )?
+                    .into_azure();
+                azure_hl::Pattern::Surface(SurfacePattern::new(
+                    source_surface.azure_source_surface,
+                    surface_style.repeat_x,
+                    surface_style.repeat_y,
+                    &Transform2D::identity(),
+                ))
+            },
+        })
+    }
+}
+
+impl ToAzureStyle for RGBA {
+    type Target = azure_hl::Color;
+
+    fn to_azure_style(self) -> azure_hl::Color {
+        azure_hl::Color::rgba(
+            self.red_f32() as f32,
+            self.green_f32() as f32,
+            self.blue_f32() as f32,
+            self.alpha_f32() as f32,
+        )
+    }
+}
+
+impl Pattern {
+    pub fn is_zero_size_gradient(&self) -> bool {
+        match *self {
+            Pattern::Azure(azure_hl::Pattern::LinearGradient(ref gradient)) => {
+                gradient.is_zero_size()
+            },
+            _ => false,
+        }
+    }
+}
+
+impl Filter {
+    fn as_azure(&self) -> azure_hl::Filter {
+        match *self {
+            Filter::Linear => azure_hl::Filter::Linear,
+            Filter::Point => azure_hl::Filter::Point,
+        }
+    }
+}
+
+impl Path {
+    pub fn transformed_copy_to_builder(
+        &self,
+        transform: &Transform2D<f32>,
+    ) -> Box<GenericPathBuilder> {
+        Box::new(self.as_azure().transformed_copy_to_builder(transform))
+    }
+
+    pub fn contains_point(&self, x: f64, y: f64, path_transform: &Transform2D<f32>) -> bool {
+        self.as_azure().contains_point(x, y, path_transform)
+    }
+
+    pub fn copy_to_builder(&self) -> Box<GenericPathBuilder> {
+        Box::new(self.as_azure().copy_to_builder())
+    }
+}

components/canvas/canvas_paint_thread.rs

@@ -3,7 +3,6 @@
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
 use crate::canvas_data::*;
-use azure::azure_hl::AntialiasMode;
 use canvas_traits::canvas::*;
 use euclid::Size2D;
 use ipc_channel::ipc::{self, IpcSender};
@@ -11,6 +10,11 @@ use std::borrow::ToOwned;
 use std::collections::HashMap;
 use std::thread;
 
+pub enum AntialiasMode {
+    Default,
+    None,
+}
+
 pub struct CanvasPaintThread<'a> {
     canvases: HashMap<CanvasId, CanvasData<'a>>,
     next_canvas_id: CanvasId,
@@ -195,9 +199,7 @@ impl<'a> CanvasPaintThread<'a> {
                 self.canvas(canvas_id).set_shadow_offset_y(value)
             },
             Canvas2dMsg::SetShadowBlur(value) => self.canvas(canvas_id).set_shadow_blur(value),
-            Canvas2dMsg::SetShadowColor(ref color) => self
+            Canvas2dMsg::SetShadowColor(color) => self.canvas(canvas_id).set_shadow_color(color),
-                .canvas(canvas_id)
-                .set_shadow_color(color.to_azure_style()),
         }
     }
 

components/canvas/lib.rs

@@ -7,6 +7,12 @@
 #[macro_use]
 extern crate log;
 
+#[cfg(feature = "azure_backend")]
+mod azure_backend;
+
+#[cfg(feature = "raqote_backend")]
+mod raqote_backend;
+
 pub mod canvas_data;
 pub mod canvas_paint_thread;
 pub mod gl_context;

components/canvas/raqote_backend.rs

@@ -0,0 +1,262 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+use crate::canvas_data::{
+    Backend, CanvasPaintState, Color, CompositionOp, DrawOptions, ExtendMode, Filter,
+    GenericDrawTarget, GenericPathBuilder, GradientStop, GradientStops, Path, Pattern,
+    SourceSurface, StrokeOptions, SurfaceFormat,
+};
+use crate::canvas_paint_thread::AntialiasMode;
+use canvas_traits::canvas::*;
+use cssparser::RGBA;
+use euclid::{Point2D, Rect, Size2D, Transform2D, Vector2D};
+use std::marker::PhantomData;
+
+pub struct RaqoteBackend;
+
+impl Backend for RaqoteBackend {
+    fn get_composition_op(&self, _opts: &DrawOptions) -> CompositionOp {
+        unimplemented!()
+    }
+
+    fn need_to_draw_shadow(&self, _color: &Color) -> bool {
+        unimplemented!()
+    }
+
+    fn size_from_pattern(&self, _rect: &Rect<f32>, _pattern: &Pattern) -> Option<Size2D<f32>> {
+        unimplemented!()
+    }
+
+    fn set_shadow_color<'a>(&mut self, _color: RGBA, _state: &mut CanvasPaintState<'a>) {
+        unimplemented!()
+    }
+
+    fn set_fill_style<'a>(
+        &mut self,
+        _style: FillOrStrokeStyle,
+        _state: &mut CanvasPaintState<'a>,
+        _drawtarget: &GenericDrawTarget,
+    ) {
+        unimplemented!()
+    }
+
+    fn set_stroke_style<'a>(
+        &mut self,
+        _style: FillOrStrokeStyle,
+        _state: &mut CanvasPaintState<'a>,
+        _drawtarget: &GenericDrawTarget,
+    ) {
+        unimplemented!()
+    }
+
+    fn set_global_composition<'a>(
+        &mut self,
+        _op: CompositionOrBlending,
+        _state: &mut CanvasPaintState<'a>,
+    ) {
+        unimplemented!()
+    }
+
+    fn create_drawtarget(&self, size: Size2D<u64>) -> Box<GenericDrawTarget> {
+        Box::new(raqote::DrawTarget::new(
+            size.width as i32,
+            size.height as i32,
+        ))
+    }
+
+    fn recreate_paint_state<'a>(&self, _state: &CanvasPaintState<'a>) -> CanvasPaintState<'a> {
+        CanvasPaintState::new(AntialiasMode::Default)
+    }
+}
+
+impl<'a> CanvasPaintState<'a> {
+    pub fn new(_antialias: AntialiasMode) -> CanvasPaintState<'a> {
+        CanvasPaintState {
+            draw_options: DrawOptions::Raqote(()),
+            fill_style: Pattern::Raqote(()),
+            stroke_style: Pattern::Raqote(()),
+            stroke_opts: StrokeOptions::Raqote(PhantomData),
+            transform: Transform2D::identity(),
+            shadow_offset_x: 0.0,
+            shadow_offset_y: 0.0,
+            shadow_blur: 0.0,
+            shadow_color: Color::Raqote(()),
+        }
+    }
+}
+
+impl Pattern {
+    pub fn is_zero_size_gradient(&self) -> bool {
+        match *self {
+            Pattern::Raqote(()) => unimplemented!(),
+        }
+    }
+}
+
+impl<'a> StrokeOptions<'a> {
+    pub fn set_line_width(&mut self, _val: f32) {
+        unimplemented!()
+    }
+    pub fn set_miter_limit(&mut self, _val: f32) {
+        unimplemented!()
+    }
+    pub fn set_line_join(&mut self, _val: LineJoinStyle) {
+        unimplemented!()
+    }
+    pub fn set_line_cap(&mut self, _val: LineCapStyle) {
+        unimplemented!()
+    }
+}
+
+impl DrawOptions {
+    pub fn set_alpha(&mut self, _val: f32) {
+        match self {
+            DrawOptions::Raqote(()) => unimplemented!(),
+        }
+    }
+}
+
+impl Path {
+    pub fn transformed_copy_to_builder(
+        &self,
+        _transform: &Transform2D<f32>,
+    ) -> Box<GenericPathBuilder> {
+        unimplemented!()
+    }
+
+    pub fn contains_point(&self, _x: f64, _y: f64, _path_transform: &Transform2D<f32>) -> bool {
+        unimplemented!()
+    }
+
+    pub fn copy_to_builder(&self) -> Box<GenericPathBuilder> {
+        unimplemented!()
+    }
+}
+
+impl GenericDrawTarget for raqote::DrawTarget {
+    fn clear_rect(&self, _rect: &Rect<f32>) {
+        unimplemented!()
+    }
+
+    fn copy_surface(
+        &self,
+        _surface: SourceSurface,
+        _source: Rect<i32>,
+        _destination: Point2D<i32>,
+    ) {
+        unimplemented!()
+    }
+
+    fn create_gradient_stops(
+        &self,
+        _gradient_stops: Vec<GradientStop>,
+        _extend_mode: ExtendMode,
+    ) -> GradientStops {
+        unimplemented!()
+    }
+
+    fn create_path_builder(&self) -> Box<GenericPathBuilder> {
+        unimplemented!()
+    }
+
+    fn create_similar_draw_target(
+        &self,
+        _size: &Size2D<i32>,
+        _format: SurfaceFormat,
+    ) -> Box<GenericDrawTarget> {
+        unimplemented!()
+    }
+    fn create_source_surface_from_data(
+        &self,
+        _data: &[u8],
+        _size: Size2D<i32>,
+        _stride: i32,
+    ) -> Option<SourceSurface> {
+        unimplemented!()
+    }
+    fn draw_surface(
+        &self,
+        _surface: SourceSurface,
+        _dest: Rect<f64>,
+        _source: Rect<f64>,
+        _filter: Filter,
+        _draw_options: &DrawOptions,
+    ) {
+        unimplemented!()
+    }
+    fn draw_surface_with_shadow(
+        &self,
+        _surface: SourceSurface,
+        _dest: &Point2D<f32>,
+        _color: &Color,
+        _offset: &Vector2D<f32>,
+        _sigma: f32,
+        _operator: CompositionOp,
+    ) {
+        unimplemented!()
+    }
+    fn fill(&self, _path: &Path, _pattern: Pattern, _draw_options: &DrawOptions) {
+        unimplemented!()
+    }
+    fn fill_rect(&self, _rect: &Rect<f32>, _pattern: Pattern, _draw_options: Option<&DrawOptions>) {
+        unimplemented!()
+    }
+    fn get_format(&self) -> SurfaceFormat {
+        unimplemented!()
+    }
+    fn get_size(&self) -> Size2D<i32> {
+        unimplemented!()
+    }
+    fn get_transform(&self) -> Transform2D<f32> {
+        unimplemented!()
+    }
+    fn pop_clip(&self) {
+        unimplemented!()
+    }
+    fn push_clip(&self, _path: &Path) {
+        unimplemented!()
+    }
+    fn set_transform(&self, _matrix: &Transform2D<f32>) {
+        unimplemented!()
+    }
+    fn snapshot(&self) -> SourceSurface {
+        unimplemented!()
+    }
+    fn stroke(
+        &self,
+        _path: &Path,
+        _pattern: Pattern,
+        _stroke_options: &StrokeOptions,
+        _draw_options: &DrawOptions,
+    ) {
+        unimplemented!()
+    }
+    fn stroke_line(
+        &self,
+        _start: Point2D<f32>,
+        _end: Point2D<f32>,
+        _pattern: Pattern,
+        _stroke_options: &StrokeOptions,
+        _draw_options: &DrawOptions,
+    ) {
+        unimplemented!()
+    }
+    fn stroke_rect(
+        &self,
+        _rect: &Rect<f32>,
+        _pattern: Pattern,
+        _stroke_options: &StrokeOptions,
+        _draw_options: &DrawOptions,
+    ) {
+        unimplemented!()
+    }
+
+    fn snapshot_data(&self, _f: &Fn(&[u8]) -> Vec<u8>) -> Vec<u8> {
+        unimplemented!()
+    }
+
+    fn snapshot_data_owned(&self) -> Vec<u8> {
+        unimplemented!()
+    }
+}

components/constellation/Cargo.toml

@@ -10,11 +10,15 @@ publish = false
 name = "constellation"
 path = "lib.rs"
 
+[features]
+azure_backend = ["canvas/azure_backend"]
+raqote_backend = ["canvas/raqote_backend"]
+
 [dependencies]
 background_hang_monitor = { path = "../background_hang_monitor"}
 backtrace = "0.3"
 bluetooth_traits = { path = "../bluetooth_traits" }
-canvas = {path = "../canvas"}
+canvas = {path = "../canvas", default-features = false}
 clipboard = "0.5"
 canvas_traits = {path = "../canvas_traits"}
 compositing = {path = "../compositing"}

components/servo/Cargo.toml

@@ -12,14 +12,15 @@ path = "lib.rs"
 crate-type = ["rlib"]
 
 [features]
-max_log_level = ["log/release_max_level_info"]
+azure_backend = ["canvas/azure_backend"]
-webdriver = ["webdriver_server"]
-energy-profiling = ["profile_traits/energy-profiling"]
 debugmozjs = ["script/debugmozjs"]
+energy-profiling = ["profile_traits/energy-profiling"]
 profilemozjs = ["script/profilemozjs"]
 googlevr = ["webvr/googlevr"]
 js_backtrace = ["script/js_backtrace"]
+max_log_level = ["log/release_max_level_info"]
 native-bluetooth = ["bluetooth/native-bluetooth"]
+raqote_backend = ["canvas/raqote_backend"]
 webrender_debugger = ["webrender/debugger"]
 no_static_freetype = ["webrender/no_static_freetype"]
 oculusvr = ["webvr/oculusvr"]
@@ -28,6 +29,7 @@ unstable = [
     "profile/unstable",
     "script/unstable",
 ]
+webdriver = ["webdriver_server"]
 webgl_backtrace = [
     "script/webgl_backtrace",
     "canvas/webgl_backtrace",
@@ -38,7 +40,7 @@ webgl_backtrace = [
 background_hang_monitor = {path = "../background_hang_monitor"}
 bluetooth_traits = {path = "../bluetooth_traits"}
 bluetooth = {path = "../bluetooth"}
-canvas = {path = "../canvas"}
+canvas = {path = "../canvas", default-features = false}
 canvas_traits = {path = "../canvas_traits"}
 compositing = {path = "../compositing", features = ["gl"]}
 constellation = {path = "../constellation"}

etc/taskcluster/decision_task.py

@@ -175,6 +175,7 @@ def linux_tidy_unit_docs():
             ./mach build --dev
             ./mach test-unit
             ./mach package --dev
+            ./mach build --dev --features raqote_backend
             ./mach build --dev --libsimpleservo
             ./mach build --dev --no-default-features --features default-except-unstable
             ./mach test-tidy --no-progress --self-test

ports/glutin/Cargo.toml

@@ -27,18 +27,20 @@ OriginalFilename = "servo.exe"
 ProductName = "Servo"
 
 [features]
+azure_backend = ["libservo/azure_backend"]
 default = ["unstable", "default-except-unstable"]
 default-except-unstable = ["webdriver", "max_log_level"]
-native-bluetooth = ["libservo/native-bluetooth"]
-max_log_level = ["log/release_max_level_info"]
-webdriver = ["libservo/webdriver"]
 energy-profiling = ["libservo/energy-profiling"]
 debugmozjs = ["libservo/debugmozjs"]
+js_backtrace = ["libservo/js_backtrace"]
+max_log_level = ["log/release_max_level_info"]
+native-bluetooth = ["libservo/native-bluetooth"]
 profilemozjs = ["libservo/profilemozjs"]
+raqote_backend = ["libservo/raqote_backend"]
 unstable = ["libservo/unstable"]
+webdriver = ["libservo/webdriver"]
 webgl_backtrace = ["libservo/webgl_backtrace"]
 webrender_debugger = ["libservo/webrender_debugger"]
-js_backtrace = ["libservo/js_backtrace"]
 
 [target.'cfg(not(target_os = "android"))'.dependencies]
 backtrace = "0.3"

ports/libmlservo/Cargo.toml

@@ -12,6 +12,10 @@ crate-type = ["staticlib"]
 test = false
 bench = false
 
+[features]
+azure_backend = ["simpleservo/azure_backend"]
+raqote_backend = ["simpleservo/raqote_backend"]
+
 [dependencies]
 libservo = { path = "../../components/servo", features = ["no_static_freetype"] }
 simpleservo = { path = "../libsimpleservo/api", features = ["no_static_freetype"] }

ports/libsimpleservo/api/Cargo.toml

@@ -26,16 +26,18 @@ libloading = "0.5"
 gl_generator = "0.11"
 
 [features]
+azure_backend = ["libservo/azure_backend"]
 default = ["unstable", "default-except-unstable"]
 default-except-unstable = ["webdriver", "max_log_level"]
-max_log_level = ["log/release_max_level_info"]
-webdriver = ["libservo/webdriver"]
-energy-profiling = ["libservo/energy-profiling"]
 debugmozjs = ["libservo/debugmozjs"]
-unstable = ["libservo/unstable"]
+energy-profiling = ["libservo/energy-profiling"]
 googlevr = ["libservo/googlevr"]
-oculusvr = ["libservo/oculusvr"]
-native-bluetooth = ["libservo/native-bluetooth"]
-webgl_backtrace = ["libservo/webgl_backtrace"]
 js_backtrace = ["libservo/js_backtrace"]
+max_log_level = ["log/release_max_level_info"]
+native-bluetooth = ["libservo/native-bluetooth"]
 no_static_freetype = ["libservo/no_static_freetype"]
+oculusvr = ["libservo/oculusvr"]
+raqote_backend = ["libservo/raqote_backend"]
+webdriver = ["libservo/webdriver"]
+unstable = ["libservo/unstable"]
+webgl_backtrace = ["libservo/webgl_backtrace"]

ports/libsimpleservo/capi/Cargo.toml

@@ -21,15 +21,17 @@ env_logger = "0.6"
 cbindgen = "0.8"
 
 [features]
+azure_backend = ["simpleservo/azure_backend"]
+debugmozjs = ["simpleservo/debugmozjs"]
 default = ["unstable", "default-except-unstable"]
 default-except-unstable = ["webdriver", "max_log_level"]
-max_log_level = ["simpleservo/max_log_level"]
-webdriver = ["simpleservo/webdriver"]
 energy-profiling = ["simpleservo/energy-profiling"]
-debugmozjs = ["simpleservo/debugmozjs"]
-unstable = ["simpleservo/unstable"]
 googlevr = ["simpleservo/googlevr"]
-oculusvr = ["simpleservo/oculusvr"]
-native-bluetooth = ["simpleservo/native-bluetooth"]
-webgl_backtrace = ["simpleservo/webgl_backtrace"]
 js_backtrace = ["simpleservo/js_backtrace"]
+max_log_level = ["simpleservo/max_log_level"]
+native-bluetooth = ["simpleservo/native-bluetooth"]
+oculusvr = ["simpleservo/oculusvr"]
+raqote_backend = ["simpleservo/raqote_backend"]
+unstable = ["simpleservo/unstable"]
+webdriver = ["simpleservo/webdriver"]
+webgl_backtrace = ["simpleservo/webgl_backtrace"]

ports/libsimpleservo/jniapi/Cargo.toml

@@ -26,15 +26,17 @@ simpleservo = { path = "../api" }
 cc = "1.0"
 
 [features]
+azure_backend = ["simpleservo/azure_backend"]
+debugmozjs = ["simpleservo/debugmozjs"]
 default = ["unstable", "default-except-unstable"]
 default-except-unstable = ["webdriver", "max_log_level"]
-max_log_level = ["simpleservo/max_log_level"]
-webdriver = ["simpleservo/webdriver"]
 energy-profiling = ["simpleservo/energy-profiling"]
-debugmozjs = ["simpleservo/debugmozjs"]
-unstable = ["simpleservo/unstable"]
 googlevr = ["simpleservo/googlevr"]
-oculusvr = ["simpleservo/oculusvr"]
-native-bluetooth = ["simpleservo/native-bluetooth"]
-webgl_backtrace = ["simpleservo/webgl_backtrace"]
 js_backtrace = ["simpleservo/js_backtrace"]
+max_log_level = ["simpleservo/max_log_level"]
+native-bluetooth = ["simpleservo/native-bluetooth"]
+oculusvr = ["simpleservo/oculusvr"]
+raqote_backend = ["simpleservo/raqote_backend"]
+unstable = ["simpleservo/unstable"]
+webdriver = ["simpleservo/webdriver"]
+webgl_backtrace = ["simpleservo/webgl_backtrace"]

python/servo/build_commands.py

@@ -296,6 +296,9 @@ class MachCommands(CommandBase):
         if self.config["build"]["dom-backtrace"]:
             features += ["dom-backtrace"]
 
+        if "raqote_backend" not in features:
+            features += ["azure_backend"]
+
         if features:
             opts += ["--features", "%s" % ' '.join(features)]
 

python/servo/post_build_commands.py

@@ -264,6 +264,8 @@ class PostBuildCommands(CommandBase):
                     else:
                         copy2(full_name, destination)
 
+        params += ["--features", "azure_backend"]
+
         returncode = self.call_rustup_run(
             ["cargo", "doc", "--manifest-path", self.ports_glutin_manifest()] + params,
             env=self.build_env())

servo-tidy.toml

@@ -39,9 +39,11 @@ packages = [
   "crossbeam-epoch",
   "crossbeam-utils",
   "digest",
+  "dwrote",
   "generic-array",
   "gl_generator", # https://github.com/servo/servo/pull/23288#issuecomment-494687746
   "lock_api",
+  "memmap",
   "nix", # https://github.com/servo/servo/issues/23189#issuecomment-487512605
   "parking_lot",
   "parking_lot_core",