Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Node-canvas
Search
Harukasan
PRO
March 19, 2014
Technology
2
640
Node-canvas
Node-canvas
Sendagaya.js@pixiv
2014-03-19
5分で終わらなかった
Harukasan
PRO
March 19, 2014
Tweet
Share
More Decks by Harukasan
See All by Harukasan
Successor to PicoRabbit: Ruby Programming Envorinment / RubyKaigi 2025 follow up
harukasan
PRO
1
180
Write your own mrbgem, Create your own device
harukasan
PRO
1
110
PicoRabbit: a Tiny Presentation Device Powered by Ruby
harukasan
PRO
2
450
pixivを支える技術 / 技育CAMPアカデミア
harukasan
PRO
3
520
20240401 新卒研修 - ピクシブにおける技術領域
harukasan
PRO
1
830
ピクシブのコンテンツ配信基盤技術 / pixiv TECH SALON
harukasan
PRO
5
5.7k
Goにおける画像ファイル処理 / golang.tokyo #19
harukasan
PRO
7
6.7k
WebRTC動画をトランスコードする / Transcoding video streams from WebRTC
harukasan
PRO
5
1.6k
ImageFluxを支えるリモート開発 / 20171202
harukasan
PRO
2
1.8k
Other Decks in Technology
See All in Technology
Browser
recruitengineers
PRO
8
2.2k
衝突して強くなる! BLUE GIANTと アジャイルチームの共通点とは ― いきいきと活気に満ちたグルーヴあるチームを作るコツ ― / BLUE GIANT and Agile Teams
naitosatoshi
0
290
Language Update: Java
skrb
2
200
実践アプリケーション設計 ①データモデルとドメインモデル
recruitengineers
PRO
5
1.4k
Kiroと学ぶコンテキストエンジニアリング
oikon48
5
6.3k
allow_retry と Arel.sql / allow_retry and Arel.sql
euglena1215
0
150
実践AIガバナンス
asei
3
290
250905 大吉祥寺.pm 2025 前夜祭 「プログラミングに出会って20年、『今』が1番楽しい」
msykd
PRO
1
220
MCPで変わる Amebaデザインシステム「Spindle」の開発
spindle
PRO
2
2.1k
生成AI時代のデータ基盤設計〜ペースレイヤリングで実現する高速開発と持続性〜 / Levtech Meetup_Session_2
sansan_randd
1
110
おやつは300円まで!の最適化を模索してみた
techtekt
PRO
0
250
Nstockの一人目エンジニアが 3年間かけて向き合ってきた セキュリティのこととこれから〜あれから半年〜
yo41sawada
0
180
Featured
See All Featured
Build The Right Thing And Hit Your Dates
maggiecrowley
37
2.8k
Making the Leap to Tech Lead
cromwellryan
134
9.5k
Design and Strategy: How to Deal with People Who Don’t "Get" Design
morganepeng
131
19k
Done Done
chrislema
185
16k
The Straight Up "How To Draw Better" Workshop
denniskardys
236
140k
Creating an realtime collaboration tool: Agile Flush - .NET Oxford
marcduiker
31
2.2k
[RailsConf 2023] Rails as a piece of cake
palkan
56
5.8k
Stop Working from a Prison Cell
hatefulcrawdad
271
21k
CoffeeScript is Beautiful & I Never Want to Write Plain JavaScript Again
sstephenson
161
15k
[Rails World 2023 - Day 1 Closing Keynote] - The Magic of Rails
eileencodes
36
2.5k
Large-scale JavaScript Application Architecture
addyosmani
512
110k
Keith and Marios Guide to Fast Websites
keithpitt
411
22k
Transcript
Node-Canvas Sendagaya.js @ pixiv 2014-03-19
Harukasan a.k.a MICHII Shunsuke ಓҪढ़հ 2012 pixiv Inc. ΠϯϑϥνʔϜ Nginx
/ Apache / MySQL / MongoDB Kyototycoon / Solr / Traffic Server / Fluentd Kibana / Capistrano / Ruby on Rails / Macbook
None
Harukasan a.k.a MICHII Shunsuke ಓҪढ़հ 2014 10,000,000ਓϢʔβاը ɾInfrastructure ɾDeployment
Harukasan a.k.a MICHII Shunsuke ಓҪढ़հ 2014 10,000,000ਓϢʔβاը ɾInfrastructure ɾDeployment ɾServer
side Javascript (Drawer) ɾClient side JavaScript
Harukasan a.k.a MICHII Shunsuke ಓҪढ़հ 2014 10,000,000ਓϢʔβاը ɾ࠲ඪܥͷ૬ޓมΛܭࢉ ɾඳըܥσʔϞϯ
ʮେྔֆഅʯͷཪଆ (1) http://inside.pixiv.net/blog/2014/02/28/inside-of-massive-ema-collection-1/
Node-Canvas
Ý
Ý
Ý
Ý Ý αʔόଆͰੜ͠ͳͯ͘ྑ͍ ඳը͕ࠩى͖ͳ͍ τϥϑΟοΫ͕େ͖͍ ΫϥΠΞϯτෛՙ͕େ͖͍ αʔόଆͰੜ ඳըࠩͷՄೳੑ τϥϑΟοΫ͕খ͍͞ ΫϥΠΞϯτෛՙ͕খ͍͞
ΫϥΠΞϯτଆੜ αʔόʔଆੜ
Ý αʔόଆͰੜ ඳըࠩͷՄೳੑ τϥϑΟοΫ͕খ͍͞ ΫϥΠΞϯτෛՙ͕খ͍͞ αʔόʔଆੜ
Ý αʔόଆͰੜ! ඳըࠩͷՄೳੑ! τϥϑΟοΫ͕খ͍͞! ΫϥΠΞϯτෛՙ͕খ͍͞ αʔόʔଆੜ — CPUؤுΕ݁ߏͲ͏ʹͰͳΔ — ؾʹͳΒͳ͔ͬͨ
— ඳըͷτϥϑΟοΫͱ͔ΰϛ — ࣮؆୯ʹͳΔ
Node-Canvas
Node-Canvas ɾCanvas implementation for Node.JS ɾRenders with Cairo ɾOutput to
JPEG/PNG ɾalso supports PDF (no description)
Share Code in Client/Server Ý draw.coffee draw.coffee ← SAME CODE
→ node-canvas native canvas
Installation (OS X) $ brew install cairo $ export PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/opt/X11/lib/pkgconfig
! $ npm install node-canvas
Create canvas Canvas = require('canvas') canvas = new Canvas(320, 240)
ctx = canvas.getContext('2d') CoffeeScript
Create canvas and draw Canvas = require('canvas') canvas = new
Canvas(320, 240) ctx = canvas.getContext('2d') ! ctx.save() ctx.fillStyle = '#ff0000' ctx.fillRect(100, 100, 200, 200) ctx.restore()
Create canvas and draw ɾ ϝιουϒϥβͱಉ͡ ɾ ඳըࣗମϒϥβͱ΄΅ಉ͡ ɾ ͑ΔίϯςΩετ2DίϯςΩετ͚ͩ
Load Image {Image} = Canvas = require 'canvas' fs =
require 'fs' path = 'test.png' fs.readFile path, (err, data) -> return next(null) if err or not data img = new Image img.src = data ctx.drawImage img, 0, 0, img.width, img.height
Load Image ɾ ctx.drawImageͰඳըͰ͖Δ ɾ ΫϥΠΞϯτͱಉ͡Α͏ʹImageΦϒδΣ ΫτΛ͑Δʂʂʂ
Output to PNG with Stream path = ‘test.png' out =
fs.createWriteStream path out.on 'finish', -> console.log 'fs: finish' ! canvas.createPNGStream().pipe out
Output to JPEG with Stream path = 'test.png' out =
fs.createWriteStream path out.on 'finish', -> console.log 'fs: finish' ! canvas.createJPEGStream(quality: 75).pipe out
Output to Image ɾ ετϦʔϜग़ྗͰ͖Δ ɾ ग़ྗܗࣜJPEG/PNG ɾ DataεΩʔϜURLʹग़ྗͰ͖Δ
Render Image Quality ctx.patternQuality = fast good best nearest bilinear
Render Image Quality ctx.patternQuality = fast # => nearest good
# => biliiner best # => biliinear nearest bilinear
Resize Quality ɾ όΠϦχΞ͔͑͠ͳ͍ ɾ ߴը࣭ʹ͢ΔʹImageMagickΛ͏ ɾ imagemagick-native͍͚Ͳ ϒϩοΩϯάϝιου͔͠ͳ͍
·ͱΊ ɾ JSΛ͏ͱΫϥΠΞϯτͱαʔόαΠυͰ ίʔυΛڞ༗Ͱ͖ͯ͘͢͝خ͍͠ ɾ Node-Canvas݁ߏී௨ʹಈ͘