Cordova開発者が知っておきたいレンダリングエンジンの話 / HTML5 Conference 2015 in Kagoshima

$PSEPWB։ൃऀ͕஌͓͖͍ͬͯͨ ϨϯμϦϯάΤϯδϯͷ࿩ )5.-ΧϯϑΝϨϯεJOࣛࣇౡ

‣ ٱอాޫଇ!BOBUPP ‣ 6*69σβΠφʔɺ  ιϑτ΢ΣΞΤϯδχΞ ‣ ΞγΞϧגࣜձࣾ"TQFDUJWF--$ ࣗݾ঺հ

޷ධൃചதʂ

IUUQPOTFOJP

ࠓ೔࿩͢͜ͱ

࿩͢͜ͱ ‣ ͳͥ$PSEPWB͔ ‣ Α͘ى͖Δ໰୊ ‣ ϨϯμϦϯάͷྲྀΕ ‣ ΠϯλϥΫγϣϯͷߴ଎Խ
‣ Ξχϝʔγϣϯͷߴ଎Խ

ͳͥ$PSEPWB͔

‣ )5.-ϋΠϒϦουΞϓϦ։ൃ  ͢ΔͨΊͷϑϨʔϜϫʔΫ

)5.-ϋΠϒϦουΞϓϦ ‣ ΞϓϦͱͯ͠ಈ࡞ ‣ ಺෦ͷ࣮૷ʹ)5.-Λར༻ ΞϓϦ ωΠςΟϒ૚ )5.-

࢓૊Έ ΞϓϦ HTML ಡΈࠐΈ WebView

)5.-ϋΠϒϦουΞϓϦ  ͷԿ͕ྑ͍ͷ͔

ΫϩεϓϥοτϑΥʔϜੑ Android iOS

΢Σϒͷ஌͕ࣝ׆͔ͤΔ

ετΞͰͷ഑෍ ‣ ֎ݟ͸ී௨ͷΞϓϦͳͷͰɺετΞͰ഑ ෍Մೳ

ωΠςΟϒͷػೳͷݺͼग़͠ ‣ +BWB4DSJQU͔Β04ͷ"1*Λݺͼग़͠Մೳ Android / iOS OS API

$PSEPWBͷఏڙ͢ΔϓϥάΠϯ ‣ ͞Βʹ$PSEPWBϓϥάΠϯͷ  ࢓૊ΈΛ࢖͑͹͜ΕҎ֎ͷ͜ͱ΋Մೳ ϑΝΠϧετϨʔδɺΧϝϥɺίϯύε Ճ଎౓ηϯαʔɺίϯλΫτϦετɺ Ґஔ৘ใऔಘɺωοτϫʔΫɺ#MVFUPPUI௨৴ɺ "OESPJEͷΠϯςϯτɺΞϓϦ಺ϒϥ΢βɺ (14ɺ/'$ɺFUDʜ

Α͘ى͜Δ໰୊

‣ ύϑΥʔϚϯε͕ѱ͍ ‣ ωΠςΟϒΞϓϦͬΆ͘ͳΒͳ͍ ‣ ಈ͖͕΋ͬ͞Γ͍ͯ͠Δ

ղܾࡦ

‣ ࠷ॳ͔Β଎͘ಈ͘Α͏ʹॻ͘ ‣ ॻ͍ͨޙʹνϡʔχϯά͢Δ PS

࠷ॳ͔Β଎͘ॻ͘ ‣ ࠷ॳ͔Β଎͍ʹͨ͜͜͠ͱ͸ແ͍ ‣ τϨʔυΦϑ͕͋·Γແ͍  ϕετϓϥΫςΟεΛ౿ऻ͢Δ

ॻ͍ͨޙʹνϡʔχϯά͢Δ ‣ ໰୊͕ग़͔ͯΒղܾ͢Δ ‣ ܭଌͯ͠ϘτϧωοΫΛಛఆɺ࠷దԽ

‣ "OESPJEͰ͸$ISPNFɺJ04Ͱ͸4BGBSJͷΠϯεϖ ΫλΛར༻ ‣ ϘτϧωοΫΛಛఆͯ͠࠷దԽ

‣ ͲͪΒΛ΍Δʹͯ͠΋  ϨϯμϦϯάͷྲྀΕͷ೺Ѳ͸ඞਢ

XFCLJUܥΤϯδϯͷ ϨϯμϦϯάͷྲྀΕ

ϨϯμϦϯάͷ޻ఔ }GSBNF ඳը͕࢝·ͬͯऴΘΔ·Ͱ͕GSBNF Loading Scripting Rendering Painting

Loading Scripting Rendering Painting

Loading ϦιʔεͷಡΈࠐΈ Ϧιʔεͷύʔε {

ϦιʔεͷಡΈࠐΈ ‣ )5.- $44 +4 ը૾ͳͲ  ϑΝΠϧΛϩʔυ͢Δ ‣ ௨ৗͷ΢ΣϒͰ͸ωοτϫʔΫӽ͠ͷ  Ϧιʔεͷऔಘ

Ϧιʔεͷύʔε ‣ ಡΈࠐΈ͕ऴΘͬͨΒɺύʔε͢Δ ‣ ϒϥ΢βͷ಺෦දݱ΁ม׵

‣ )5.-͸%0.πϦʔʹม׵͞ΕΔ <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> IUUQXXXIUNMSPDLTDPNFOUVUPSJBMTJOUFSOBMTIPXCSPXTFSTXPSL )5.-

$44 ‣ $44͸$440.πϦʔʹม׵͞ΕΔ body { color: black; } .container {
width: 920px; IUUQXXXIUNMSPDLTDPNFOUVUPSJBMTJOUFSOBMTIPXCSPXTFSTXPSL

+BWB4DSJQU ‣ +BWB4DSJQU͸࣮ߦՄೳͳදݱʹίϯύΠϧ ‣ +*5ίϯύΠϧͰػցޠʹม׵͞ΕͨΓ

௨ৗͷ΢Σϒͷ৔߹ ‣ ϦιʔεͷಡΈࠐΈ͕ѹ౗తʹ஗͍ ‣ ը૾ͷ࠷దԽ ‣ )5.-$44+4ͷѹॖ ‣ ಡΈࠐΈॱংͷ࠷దԽ

ϋΠϒϦουΞϓϦͷ৔߹ ‣ ϦιʔεಡΈࠐΈ͸͋·Γ໰୊ʹͳΒͳ͍ ‣ ͢ͰʹϚγϯ಺ʹϦιʔε͕͋Δ͔Β ‣ ύʔε΋ϘτϧωοΫʹ͸ͳΒͳ͍

‣ +BWB4DSJQU͸଎͍ɻ  جຊతʹͦΕ΄Ͳ໰୊ʹͳΒͳ͍ɻ

‣ ܭࢉྔͷଟ͍ॲཧ ‣ DBOWBT΁ͷඳը ‣ MBZPVUΛಉظతʹڧ੍͢Δίʔυ ໰୊ʹͳΔέʔε

4DSJQUJOH͕ϘτϧωοΫͩͬͨΒ ‣ ࿩͸؆୯ 1SPpMFTλϒͰ͞Βʹܭଌ

‣ #PUUPN6Qͷ4FMGཝɻॏ͍ͨؔ਺Λಛఆ

ಉظతͳ-BZPVUͷڧ੍Λආ͚Δ ‣ UJNFMJOFͰ͜Ε͕ग़ͨΒ஫ҙ IUUQTEFWFMPQFSDISPNFDPNEFWUPPMTEPDTEFNPTUPPNVDIMBZPVU

ಉظతͳMBZPVUͷڧ੍ͷྫ ‣ ཁૉͷҐஔ΍αΠζΛઃఆͭͭ͠P⒎TFU5PQ΍ HFU#PVOEJOH$MJFOU3FDU Λࢀর͢Δͱى͜Δ for(var m = 0; m
< movers.length; m++) { movers[m].style.left = movers[m].offsetTop + 'px'; }

Rendering ϦιʔεͷಡΈࠐΈ Ϧιʔεͷύʔε Calculate Style Layout {

$BMDVMBUF4UZMF ‣ ݸผͷ%0.ཁૉʹରͯ͠ɺ౰ͨΔελΠ ϧΛܭࢉ͢Δ ‣ $440.πϦʔͱ%0.πϦʔΛࢀরͯ͠ɺ ϚονϯάॲཧΛߦ͏

$44ϧʔϧͷϚονϯά %0.ཁૉ਺ ʷ $44ϧʔϧ਺ ॲཧճ਺ ‣ ૯౰ΓͰॲཧ͍ͯ͘͠ ‣ %0.ཁૉͱϧʔϧͷ਺͸ 
গͳ͚Ε͹গͳ͍΄Ͳྑ͍

ྑ͘ͳ͍ηϨΫλͷॻ͖ํ ‣ ࢠ ଙ ηϨΫλ͸ආ͚Δ ‣ %0.ཁૉͷ਌Λḷ͍ͬͯ͘ඞཁ͕༗ΔͨΊ body .foo .bar
.hoge { … }

ྑ͍ηϨΫλͷॻ͖ํ ‣ %0.ཁૉΛճݟΔ͚ͩ ‣ อकੑͷ఺Ͱ΋ྑ͍ .foo-bar-hoge { … }

ن໿ʹ#&.Λ࢖͓͏ ‣ ࢠ ଙ ηϨΫλ͕ࣗಈతʹແ͘ͳΓߴ଎ʹ

$44ϧʔϧͷϚονϯάॲཧ͸ അࣛʹͳΒͳ͍ ‣ %0.ૢ࡞͢Δͨͼʹॲཧ͕૸ΔͨΊ ‣ ΠϯλϥΫγϣϯΛ଎͘͢ΔͨΊʹ͸͜ ͷॲཧ΋଎͘͢Δඞཁ͋Γ

-BZPVU ‣ ͦΕͧΕͷ%0.ཁૉͷϨΠΞ΢τ৘ใΛ ܭࢉ͢ΔϑΣʔζ

-BZPVUͷ࠷ѱͷγφϦΦ ‣ %0.ૢ࡞΍$44ϓϩύςΟΛมߋͨ࣌͠ ‣ -BZPVUॲཧ͕Ҿ͖ى͜͞Εɺશͯͷ%0. ཁૉͷϨΠΞ΢τܭࢉ͕࠶౓ߦΘΕΔ

ཁૉͷαΠζΛͳΔ΂͘ݻఆ͢Δ ‣ ϨΠΞ΢τܭࢉΛͳΔ΂͘গͳ͘͢ΔͨΊ .foobar { width: 100px; height: 200px; }

BCTPMVUFϨΠΞ΢τΛੵۃతʹ࢖͏ ‣ ϨΠΞ΢τܭࢉΛͳΔ΂͘গͳ͘͢ΔͨΊ .piyo { position: absolute; top: 200px; left:
400px; }

ը૾ͷαΠζ͸ඞͣࢦఆ͢Δ ‣ -BZPVUͷ΍Γͳ͓͠Λ๷͙ͨΊ <img src=“foo.png” width=“300” height=“299”>

ϦιʔεͷಡΈࠐΈ Ϧιʔεͷύʔε Paint Rasterize { Painting Composite Layers

1BJOU ‣ %JTQMBZ-JTU $ISPNJVNͩͱ4LJB΁ͷ໋ྩ ͷੜ੒͢ΔϑΣʔζ ‣ جຊ໰୊ʹͳΒͳ͍

3BTUFSJ[F ‣ ੜ੒ͨ͠%JTQMBZ-JTUΛ࣮ߦ࣮ͯ͠ࡍʹϐΫη ϧԽ͢ΔϑΣʔζ ‣ ॏ͍ͨ$44ϓϩύςΟ͕͔͔ͬͯΔͱ͕࣌ؒ ͔͔Δ ‣ CPYTIBEPX΍CPSEFSSBEJVT౳ ‣
$ISPNJVNͩͱ4LJB%FCVHHFSͰ֬ೝͰ͖Δ

$PNQPTJUF-BZFST ‣ 3BTUFSJ[F֤ͨ͠ϨΠϠʔΛ߹੒͢ΔϑΣʔ ζ ‣ [JOEFY΍pYFEQPTJUJPOͳͲʹԠͯ͡Ұຕ ֆʹ͢Δ

Ҏ্ ‣ ϨϯμϦϯάͷ޻ఔ͸͜ͷ̐ͭ Loading Scripting Rendering Painting

ΠϯλϥΫγϣϯΛ ଎͘͢Δ

ΠϯλϥΫγϣϯͱ͸ ‣ ϢʔβͷΞΫγϣϯʹԠͯ͡ը໘্ʹ  ද͞ΕΔϨεϙϯε ‣ GSBNFΛNTఔ౓ҎԼʹ཈͑Δ Button

جຊతͳߟ͑ํ ‣ 4DSJQUJOHҎԼͷ޻ఔΛ଎͘͢Δ Rendering Painting { Paint Rasterize Composite Layers
Calculate Style Layout { Scripting

ΞχϝʔγϣϯΛ ଎͘͢Δ

ΞχϝʔγϣϯΛ଎͘͢Δ ‣ $445SBOTJUJPO΍SFRVFTU"OJNBUJPO'SBNF  ͰͷΞχϝʔγϣϯ ‣ GSBNFΛNTҎԼʹ཈͑Δ '14

جຊతͳߟ͑ํ ‣ 4DSJQUJOHҎ֎͸$PNQPTJUF-BZFSTͷΈΛ  ૸ΒͤΔΑ͏ʹ͢Δ Paint Rasterize { Composite Layers Painting

Ξχϝʔγϣϯ͸γϏΞ ‣ %0.ૢ࡞ͨ͠Γɺ-BZPVUΛҾ͖ىͨ͜͠ Γ͢ΔͱϞόΠϧͩͱશ͘࢖͍΋ͷʹͳ Βͳ͍ ‣ Ξχϝʔγϣϯத͸USBOTGPSNͱPQBDJUZ͠ ͔͍͡Βͳ͍ͷ͕٢

(16Λ׆༻͢Δ ‣ USBOTGPSNελΠϧଐੑʹ͸ɺ USBOTMBUFE ΛؚΊ͓ͯ͘ ‣ $PNQPTJUF-BZFSTॲཧ࣌ʹ(16Ͱ߹੒͞
ΕΔΑ͏ʹͳΔ

ิ଍$44ϓϩύςΟͷมߋ

$44ϓϩύςΟͷมߋ͢Δͱ Կ͕ى͜Δ ‣ $44ϓϩύςΟʹΑͬͯҧ͏ ‣ XJEUI΍NBSHJOͳͲཁૉͷେ͖͞΍Ґஔͷมߋ ‣ -BZPVU͔Βॲཧ͕࢝·Δ ‣ USBOTGPSN΍PQBDJUZΛมߋ
‣ $PNQPTJUF-BZFSTͷΈ૸Δ

$445SJHHFSTͷ঺հ ‣ $44ϓϩύςΟͷมߋ͕  ԿΛҾ͖ى͔͜͢໢ཏ IUUQDTTUSJHHFSTDPN

·ͱΊ

ϨϯμϦϯάͷ޻ఔ Loading Scripting Rendering Painting ‣ ͦΕͧΕ໾ׂ͕͋Γνϡʔχϯάํ๏΋ҧ͏

ΠϯλϥΫγϣϯΛ଎͘͢Δ Rendering Painting ‣ 4DSJQUJOHҎԼΛ଎͘͢Δ Scripting

ΞχϝʔγϣϯΛ଎͘͢Δ ‣ $PNQPTJUF-BZFSTͷΈ૸ΒͤΔ Paint Rasterize { Composite Layers Painting

͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠

Cordova開発者が知っておきたいレンダリングエンジンの話 / HTML5 Conferen...

Cordova開発者が知っておきたいレンダリングエンジンの話 / HTML5 Conference 2015 in Kagoshima

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