Fix update_lines performance issues

This resolves performance issues with the `update_lines` method that were caused by excessive updates without underlines or strikeout present. This also resolves a bug that was causing the underline and strikeout to extend beyond the end of line in some rare cases. This fixes #114.
2019-04-19 12:07:56 +00:00 · 2019-04-19 12:07:56 +00:00 · 6716c81c08
parent badc41e1d0
commit 6716c81c08
6 changed files with 201 additions and 146 deletions
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@ -21,6 +21,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Unnecessary resize at startup
 - Text getting blurry after live-reloading shaders with padding active
 - Resize events are not send to the shell anymore if dimensions haven't changed
+- Minor performance issues with underline and strikeout checks
+- Rare bug which would extend underline and strikeout beyond the end of line

 ## Version 0.3.0

--- a/Cargo.lock
+++ b/Cargo.lock
@ -47,8 +47,8 @@ dependencies = [
 "fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
 "font 0.1.0",
 "gl_generator 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "glutin 0.21.0-rc2 (registry+https://github.com/rust-lang/crates.io-index)",
- "image 0.21.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glutin 0.21.0-rc3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "image 0.21.1 (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)",
 "mio 0.6.16 (registry+https://github.com/rust-lang/crates.io-index)",
@ -60,7 +60,7 @@ dependencies = [
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 "objc 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
 "parking_lot 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "reqwest 0.9.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "reqwest 0.9.15 (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)",
 "serde_json 1.0.39 (registry+https://github.com/rust-lang/crates.io-index)",
@ -88,7 +88,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
 "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
 "line_drawing 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "rusttype 0.7.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rusttype 0.7.6 (registry+https://github.com/rust-lang/crates.io-index)",
 "walkdir 2.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
 "xdg 2.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
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@ -117,7 +117,7 @@ dependencies = [

 [[package]]
 name = "arc-swap"
-version = "0.3.9"
+version = "0.3.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"

 [[package]]
@ -166,7 +166,7 @@ dependencies = [
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 "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
- "rustc-demangle 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc-demangle 0.1.14 (registry+https://github.com/rust-lang/crates.io-index)",
 "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]

@ -380,6 +380,34 @@ name = "constant_time_eq"
 version = "0.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"

+[[package]]
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+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)",
+ "url 1.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
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+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
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+ "failure 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "failure_derive 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "idna 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "publicsuffix 1.5.2 (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)",
+ "serde_json 1.0.39 (registry+https://github.com/rust-lang/crates.io-index)",
+ "time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)",
+ "try_from 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "url 1.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "copypasta"
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@ -575,8 +603,8 @@ version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
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- "syn 0.15.30 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.32 (registry+https://github.com/rust-lang/crates.io-index)",
 ]

 [[package]]
@ -642,7 +670,7 @@ dependencies = [
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- "regex 1.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex 1.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
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 ]

@ -654,7 +682,7 @@ dependencies = [
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- "regex 1.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex 1.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
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@ -677,6 +705,14 @@ dependencies = [
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 ]

+[[package]]
+name = "error-chain"
+version = "0.12.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "backtrace 0.3.15 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "euclid"
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@ -692,8 +728,8 @@ version = "0.1.0"
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- "quote 0.6.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.30 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.32 (registry+https://github.com/rust-lang/crates.io-index)",
 ]

 [[package]]
@ -720,8 +756,8 @@ version = "0.1.5"
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 dependencies = [
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- "quote 0.6.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.30 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.32 (registry+https://github.com/rust-lang/crates.io-index)",
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@ -764,7 +800,7 @@ dependencies = [
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- "rusttype 0.7.5 (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)",
 ]

@ -878,16 +914,6 @@ dependencies = [
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-[[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
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-
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@ -913,7 +939,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"

 [[package]]
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 dependencies = [
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- "glutin_egl_sys 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glutin_egl_sys 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
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- "glutin_wgl_sys 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glutin_gles2_sys 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glutin_glx_sys 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
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@ -939,11 +965,10 @@ dependencies = [

 [[package]]
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- "gl_generator 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gl_generator 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
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 ]

@ -954,17 +979,16 @@ source = "registry+https://github.com/rust-lang/crates.io-index"

 [[package]]
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- "gl_generator 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gl_generator 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
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 [[package]]
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@ -973,16 +997,15 @@ dependencies = [

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- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gl_generator 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
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 [[package]]
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+ "h2 0.1.18 (registry+https://github.com/rust-lang/crates.io-index)",
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- "hyper 0.12.25 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hyper 0.12.27 (registry+https://github.com/rust-lang/crates.io-index)",
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@ -1071,7 +1094,7 @@ dependencies = [

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@ -1172,7 +1194,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"

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- "syn 0.15.30 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.32 (registry+https://github.com/rust-lang/crates.io-index)",
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 [[package]]
@ -1706,6 +1728,18 @@ dependencies = [
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+[[package]]
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+ "url 1.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
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+
 [[package]]
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@ -1718,7 +1752,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"

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+ "hyper 0.12.27 (registry+https://github.com/rust-lang/crates.io-index)",
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+ "serde_urlencoded 0.5.5 (registry+https://github.com/rust-lang/crates.io-index)",
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@ -1952,7 +1989,7 @@ dependencies = [

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 [[package]]
@ -1965,7 +2002,7 @@ dependencies = [

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@ -1979,11 +2016,6 @@ name = "ryu"
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 source = "registry+https://github.com/rust-lang/crates.io-index"

-[[package]]
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-
 [[package]]
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@ -2056,8 +2088,8 @@ version = "1.0.90"
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 "checksum remove_dir_all 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)" = "3488ba1b9a2084d38645c4c08276a1752dcbf2c7130d74f1569681ad5d2799c5"
-"checksum reqwest 0.9.13 (registry+https://github.com/rust-lang/crates.io-index)" = "3c4ef83e0beb14bfe38b9f01330a5bc8e965a9f9628690aa28383746dac1e925"
-"checksum rustc-demangle 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)" = "adacaae16d02b6ec37fdc7acfcddf365978de76d1983d3ee22afc260e1ca9619"
+"checksum reqwest 0.9.15 (registry+https://github.com/rust-lang/crates.io-index)" = "943b9f85622f53bcf71721e0996f23688e3942e51fc33766c2e24a959316767b"
+"checksum rustc-demangle 0.1.14 (registry+https://github.com/rust-lang/crates.io-index)" = "ccc78bfd5acd7bf3e89cffcf899e5cb1a52d6fafa8dec2739ad70c9577a57288"
 "checksum rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "138e3e0acb6c9fb258b19b67cb8abd63c00679d2851805ea151465464fe9030a"
-"checksum rusttype 0.7.5 (registry+https://github.com/rust-lang/crates.io-index)" = "ce3926a2057b315b3e8bca6d1cec1e97f19436a8f9127621cd538cda9c96a38b"
+"checksum rusttype 0.7.6 (registry+https://github.com/rust-lang/crates.io-index)" = "25951e85bb2647960969f72c559392245a5bd07446a589390bf427dda31cdc4a"
 "checksum ryu 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)" = "eb9e9b8cde282a9fe6a42dd4681319bfb63f121b8a8ee9439c6f4107e58a46f7"
-"checksum safe-transmute 0.10.1 (registry+https://github.com/rust-lang/crates.io-index)" = "9604873ffe1980bc1f179103704a65c8aca141c248d9e52b7af95ff10578166e"
 "checksum same-file 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)" = "8f20c4be53a8a1ff4c1f1b2bd14570d2f634628709752f0702ecdd2b3f9a5267"
 "checksum schannel 0.1.15 (registry+https://github.com/rust-lang/crates.io-index)" = "f2f6abf258d99c3c1c5c2131d99d064e94b7b3dd5f416483057f308fea253339"
 "checksum scoped_threadpool 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)" = "1d51f5df5af43ab3f1360b429fa5e0152ac5ce8c0bd6485cae490332e96846a8"
@ -3037,7 +3080,7 @@ dependencies = [
 "checksum serde 1.0.90 (registry+https://github.com/rust-lang/crates.io-index)" = "aa5f7c20820475babd2c077c3ab5f8c77a31c15e16ea38687b4c02d3e48680f4"
 "checksum serde_derive 1.0.90 (registry+https://github.com/rust-lang/crates.io-index)" = "58fc82bec244f168b23d1963b45c8bf5726e9a15a9d146a067f9081aeed2de79"
 "checksum serde_json 1.0.39 (registry+https://github.com/rust-lang/crates.io-index)" = "5a23aa71d4a4d43fdbfaac00eff68ba8a06a51759a89ac3304323e800c4dd40d"
-"checksum serde_urlencoded 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)" = "d48f9f99cd749a2de71d29da5f948de7f2764cc5a9d7f3c97e3514d4ee6eabf2"
+"checksum serde_urlencoded 0.5.5 (registry+https://github.com/rust-lang/crates.io-index)" = "642dd69105886af2efd227f75a520ec9b44a820d65bc133a9131f7d229fd165a"
 "checksum serde_yaml 0.8.8 (registry+https://github.com/rust-lang/crates.io-index)" = "0887a8e097a69559b56aa2526bf7aff7c3048cf627dff781f0b56a6001534593"
 "checksum servo-fontconfig 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "a088f8d775a5c5314aae09bd77340bc9c67d72b9a45258be34c83548b4814cd9"
 "checksum servo-fontconfig-sys 4.0.7 (registry+https://github.com/rust-lang/crates.io-index)" = "b46d201addcfbd25c1798ad1281d98c40743824e0b0f1e611bd3d5d0d31a7b8d"
@ -3054,7 +3097,7 @@ dependencies = [
 "checksum stb_truetype 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)" = "69b7df505db8e81d54ff8be4693421e5b543e08214bd8d99eb761fcb4d5668ba"
 "checksum string 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "b639411d0b9c738748b5397d5ceba08e648f4f1992231aa859af1a017f31f60b"
 "checksum strsim 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "8ea5119cdb4c55b55d432abb513a0429384878c15dde60cc77b1c99de1a95a6a"
-"checksum syn 0.15.30 (registry+https://github.com/rust-lang/crates.io-index)" = "66c8865bf5a7cbb662d8b011950060b3c8743dca141b054bf7195b20d314d8e2"
+"checksum syn 0.15.32 (registry+https://github.com/rust-lang/crates.io-index)" = "846620ec526c1599c070eff393bfeeeb88a93afa2513fc3b49f1fea84cf7b0ed"
 "checksum synstructure 0.10.1 (registry+https://github.com/rust-lang/crates.io-index)" = "73687139bf99285483c96ac0add482c3776528beac1d97d444f6e91f203a2015"
 "checksum tempfile 3.0.7 (registry+https://github.com/rust-lang/crates.io-index)" = "b86c784c88d98c801132806dadd3819ed29d8600836c4088e855cdf3e178ed8a"
 "checksum termcolor 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)" = "4096add70612622289f2fdcdbd5086dc81c1e2675e6ae58d6c4f62a16c6d7f2f"
@ -3075,6 +3118,7 @@ dependencies = [
 "checksum tokio-timer 0.2.10 (registry+https://github.com/rust-lang/crates.io-index)" = "2910970404ba6fa78c5539126a9ae2045d62e3713041e447f695f41405a120c6"
 "checksum tokio-trace-core 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "350c9edade9830dc185ae48ba45667a445ab59f6167ef6d0254ec9d2430d9dd3"
 "checksum try-lock 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "e604eb7b43c06650e854be16a2a03155743d3752dd1c943f6829e26b7a36e382"
+"checksum try_from 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)" = "283d3b89e1368717881a9d51dad843cc435380d8109c9e47d38780a324698d8b"
 "checksum ucd-util 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "535c204ee4d8434478593480b8f86ab45ec9aae0e83c568ca81abf0fd0e88f86"
 "checksum unicase 1.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "7f4765f83163b74f957c797ad9253caf97f103fb064d3999aea9568d09fc8a33"
 "checksum unicase 2.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "41d17211f887da8e4a70a45b9536f26fc5de166b81e2d5d80de4a17fd22553bd"
--- a/src/display.rs
+++ b/src/display.rs
@ -415,7 +415,7 @@ impl Display {
                pty_size.height -= pty_size.cell_height * message.text(&size).len() as f32;
            }

-            if previous_cols != size.cols() || previous_lines != size.lines()  {
+            if previous_cols != size.cols() || previous_lines != size.lines() {
                pty_resize_handle.on_resize(&pty_size);
            }

@ -489,7 +489,7 @@ impl Display {
                    // Iterate over all non-empty cells in the grid
                    for cell in grid_cells {
                        // Update underline/strikeout
-                        rects.update_lines(&cell);
+                        rects.update_lines(&size_info, &cell);

                        // Draw the cell
                        api.render_cell(cell, glyph_cache);
--- a/src/index.rs
+++ b/src/index.rs
@ -19,6 +19,8 @@ use std::cmp::{Ord, Ordering};
 use std::fmt;
 use std::ops::{self, Add, AddAssign, Deref, Range, RangeInclusive, Sub, SubAssign};

+use crate::term::RenderableCell;
+
 /// The side of a cell
 #[derive(Debug, Copy, Clone, Eq, PartialEq)]
 pub enum Side {
@ -69,6 +71,12 @@ impl From<Point> for Point<usize> {
    }
 }

+impl From<&RenderableCell> for Point<Line> {
+    fn from(cell: &RenderableCell) -> Self {
+        Point::new(cell.line, cell.column)
+    }
+}
+
 /// A line
 ///
 /// Newtype to avoid passing values incorrectly
--- a/src/renderer/rects.rs
+++ b/src/renderer/rects.rs
@ -11,12 +11,12 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
-use std::collections::HashMap;
+use font::Metrics;

+use crate::index::Point;
 use crate::term::cell::Flags;
 use crate::term::color::Rgb;
 use crate::term::{RenderableCell, SizeInfo};
-use font::Metrics;

 #[derive(Debug, Copy, Clone)]
 pub struct Rect<T> {
@ -32,87 +32,84 @@ impl<T> Rect<T> {
    }
 }

+#[derive(Debug)]
+struct Line {
+    flag: Flags,
+    range: Option<(RenderableCell, Point)>,
+}
+
+impl Line {
+    fn new(flag: Flags) -> Self {
+        Self { flag, range: None }
+    }
+}
+
 /// Rects for underline, strikeout and more.
 pub struct Rects<'a> {
    inner: Vec<(Rect<f32>, Rgb)>,
-    last_starts: HashMap<Flags, Option<RenderableCell>>,
-    last_cell: Option<RenderableCell>,
+    active_lines: Vec<Line>,
    metrics: &'a Metrics,
    size: &'a SizeInfo,
 }

 impl<'a> Rects<'a> {
    pub fn new(metrics: &'a Metrics, size: &'a SizeInfo) -> Self {
-        let mut last_starts = HashMap::new();
-        last_starts.insert(Flags::UNDERLINE, None);
-        last_starts.insert(Flags::STRIKEOUT, None);
-
-        Self { inner: Vec::new(), last_cell: None, last_starts, metrics, size }
+        let active_lines = vec![Line::new(Flags::UNDERLINE), Line::new(Flags::STRIKEOUT)];
+        Self { inner: Vec::new(), active_lines, metrics, size }
    }

    /// Convert the stored rects to rectangles for the renderer.
-    pub fn rects(mut self) -> Vec<(Rect<f32>, Rgb)> {
-        // If there's still a line pending, draw it until the last cell
-        for (flag, start_cell) in self.last_starts.iter_mut() {
-            if let Some(start) = start_cell {
-                self.inner.push(create_rect(
-                    &start,
-                    &self.last_cell.unwrap(),
-                    *flag,
-                    &self.metrics,
-                    &self.size,
-                ));
-            }
-        }
-
-        self.inner
+    pub fn rects(&self) -> &Vec<(Rect<f32>, Rgb)> {
+        &self.inner
    }

    /// Update the stored lines with the next cell info.
-    pub fn update_lines(&mut self, cell: &RenderableCell) {
-        for (flag, start_cell) in self.last_starts.iter_mut() {
-            let flag = *flag;
-            *start_cell = match *start_cell {
+    pub fn update_lines(&mut self, size_info: &SizeInfo, cell: &RenderableCell) {
+        for line in self.active_lines.iter_mut() {
+            match line.range {
                // Check for end if line is present
-                Some(ref mut start) => {
-                    let last_cell = self.last_cell.unwrap();
-
+                Some((ref mut start, ref mut end)) => {
                    // No change in line
                    if cell.line == start.line
-                        && cell.flags.contains(flag)
+                        && cell.flags.contains(line.flag)
                        && cell.fg == start.fg
-                        && cell.column == last_cell.column + 1
+                        && cell.column == end.col + 1
                    {
+                        if size_info.cols() == cell.column && size_info.lines() == cell.line {
+                            // Add the last rect if we've reached the end of the terminal
+                            self.inner.push(create_rect(
+                                &start,
+                                cell.into(),
+                                line.flag,
+                                &self.metrics,
+                                &self.size,
+                            ));
+                        } else {
+                            // Update the length of the line
+                            *end = cell.into();
+                        }
+
                        continue;
                    }

-                    self.inner.push(create_rect(
-                        &start,
-                        &last_cell,
-                        flag,
-                        &self.metrics,
-                        &self.size,
-                    ));
+                    self.inner.push(create_rect(start, *end, line.flag, &self.metrics, &self.size));

                    // Start a new line if the flag is present
-                    if cell.flags.contains(flag) {
-                        Some(*cell)
+                    if cell.flags.contains(line.flag) {
+                        *start = *cell;
+                        *end = cell.into();
                    } else {
-                        None
+                        line.range = None;
                    }
                },
                // Check for new start of line
                None => {
-                    if cell.flags.contains(flag) {
-                        Some(*cell)
-                    } else {
-                        None
+                    if cell.flags.contains(line.flag) {
+                        line.range = Some((*cell, cell.into()));
                    }
                },
            };
        }
-
-        self.last_cell = Some(*cell);
    }

    // Add a rectangle
@ -125,13 +122,13 @@ impl<'a> Rects<'a> {
 /// of `end`, based on the given flag and size metrics.
 fn create_rect(
    start: &RenderableCell,
-    end: &RenderableCell,
+    end: Point,
    flag: Flags,
    metrics: &Metrics,
    size: &SizeInfo,
 ) -> (Rect<f32>, Rgb) {
    let start_x = start.column.0 as f32 * size.cell_width;
-    let end_x = (end.column.0 + 1) as f32 * size.cell_width;
+    let end_x = (end.col.0 + 1) as f32 * size.cell_width;
    let width = end_x - start_x;

    let (position, mut height) = match flag {
--- a/src/term/mod.rs
+++ b/src/term/mod.rs
@ -1318,7 +1318,9 @@ impl Term {
        lines = min(lines, self.scroll_region.end - origin);

        // Scroll between origin and bottom
-        self.grid.scroll_down(&(origin..self.scroll_region.end), lines, &self.cursor.template);
+        let mut template = self.cursor.template;
+        template.flags = Flags::empty();
+        self.grid.scroll_down(&(origin..self.scroll_region.end), lines, &template);
    }

    /// Scroll screen up
@ -1331,7 +1333,9 @@ impl Term {
        let lines = min(lines, self.scroll_region.end - self.scroll_region.start);

        // Scroll from origin to bottom less number of lines
-        self.grid.scroll_up(&(origin..self.scroll_region.end), lines, &self.cursor.template);
+        let mut template = self.cursor.template;
+        template.flags = Flags::empty();
+        self.grid.scroll_up(&(origin..self.scroll_region.end), lines, &template);
    }

    fn deccolm(&mut self) {