SkiaとImpellerについて

by Taichi Moriya

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क୩!גࣜձࣾ%F/" 4LJBͱJNQFMMFSʹ͍ͭͯ

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ࣗݾ঺հ w J04ͱ͔'MVUUFSͱ͔8FCϑϩϯ τͱ͔΍ͬͯ·͢ w έόϒ͕޷͖Ͱ͢

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ಥવͰ͕͢

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Ͳ͏΍ͬͯ6*͕දࣔ͞ΕΔͷ͔ ؾʹͳΓ·ͤΜ͔ʁ

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͜ͷؒʹԿ͕ى͍ͬͯ͜Δͷ͔

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6*͕දࣔ͞ΕΔ·Ͱ w (16Λհͯ͠ը໘ʹදࣔ w (16Λಈ͔͢ʹ͸0QFO(-ͳͲ ͷ(SBQIJDT"1*Λ࢖༻ w 'MVUUFSʹݶΒͣͲͷϑϨʔϜϫ ʔΫͰ΋มΘΒͳ͍ (SBQIJD"1* 0QFO(- 7VMLBO .FUBM "QQMJDBUJPO$PEF (16 σΟεϓϨΠ

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'MVUUFSͰ͸ʁ w 8JEHFU 'SBNFXPSL Λ௨ͯ͠ &OHJOFͷ4LJBJNQFMMFS΁ w 4LJBJNQFMMFS͔Β4VSGBDF͕ ଘࡏ͢Δ&NCFEEFSΛ௨ͯ͠ඳը &NCFEEFS &OHJOF 4LJBJNQFMMFS 'MVUUFS'SBNFXPSL (SBQIJD"1* 0QFO(- 7VMLBO .FUBM

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'MVUUFSͷΞʔΩςΫνϟ w ࡾ૚ߏ଄ w 'SBNFXPSL w ΞϓϦͰ࢖͏8JEHFUͳͲ w &OHJOF w ϨϯμϦϯά΍ϨΠΞ΢τܭࢉɺJTPMBUF ͳͲ w 4LJBͱJNQFMMFS͸͜͜ʹҐஔ͢Δ w &NCFEEFS w ֤ϓϥοτϑΥʔϜʹରԠͨ͠ॲཧ 'MVUUFSBSDIJUFDUVSBMPWFSWJFX IUUQTEPDT fl VUUFSEFWSFTPVSDFTBSDIJUFDUVSBMPWFSWJFX

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ͦ΋ͦ΋4LJBͬͯʁ w l%zઐ༻ͷϨϯμϦϯάΤϯδ ϯ w (PPHMF͕ओಋͯ͠։ൃ w 'MVUUFSҎ֎Ͱ΋"OESPJE΍ $ISPNFͰ΋࠾༻͞Ε͍ͯΔ 4LJB IUUQTTLJBPSH

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JNQFMMFSͱ͸ʁ w 'MVUUFSઐ༻ͷϨϯμϦϯάΤϯ δϯ w (PPHMF͕ओಋͯ͠։ൃ w 'MVUUFS͔ΒQSFWJFX͕ ελʔτ JNQFMMFS IUUQTHJUIVCDPN fl VUUFSFOHJOFUSFFNBJOJNQFMMFS

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ϨϯμϦϯάΤϯδϯʁ w 0QFO(-ͷ௚ॻ͖Ͱ΋ ӈͷΑ͏ʹඳը͸Ͱ͖Δ͕ʜ ࢖Θͳ͍৔߹

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ϨϯμϦϯάΤϯδϯʁ 4LJBΛ࢖ͬͯΈΔ w ઌ΄Ͳͷॲཧͱಉ͡ w ΑΓ෼͔Γ΍͍͢هड़ w ඳըॲཧΛந৅Խ w J04"OESPJEΛ͸͡Ίͱͨ͠ ϓϥοτϑΥʔϜ΁ͷରԠ w ඳըॲཧͳͲΛӅṭͨ͠ ϥΠϒϥϦ

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'MVUUFSͰͷඳըϑϩʔʹ͍ͭͯ

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શମ૾ 8JEHFU &MFNFOU 3FOEFS0CKFDU -BZFS %JTQMBZ-JTU 0Q *NQFMMFS4LJB

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ࠓճ஫໨͢Δͷ͸͜͜ 8JEHFU &MFNFOU 3FOEFS0CKFDU -BZFS %JTQMBZ-JTU 0Q *NQFMMFS4LJB

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͜͜Β΁Μ͸ʁ 8JEHFU &MFNFOU 3FOEFS0CKFDU -BZFS 'MVUUFS,BJHJ3FOEFS0CKFDUΑΓԼͷੈքͷ'MVUUFSCZGBTUSJWFSͰৄ͘͠ղઆ͞Εͯ·͢ ͓͢͢ΊͰ͢ɺݟ·͠ΐ͏ʂʂʂʂʂ

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8JEHFU w ීஈ৮Δ6*ͷཁૉ w ੜ੒ͱഁغ͕සൟʹى͜Δ w ࢠͷ৘ใΛ΋ͭ w ࣮ଶͱͯ͠͸8JEHFUΛܧঝͨ͠ 4JOHMF$IJME3FOEFS0CKFDU8JEHFU ͳͲ

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&MFNFOU w 8JEHFUΫϥε͕࣋ͭ DSFBUF&MFNFOU Ͱ࡞੒ w ϥΠϑαΠΫϧͷ؅ཧ w Ϛ΢ϯτ΍ߋ৽ɺΞϯϚ΢ϯ τͳͲ w 3FOEFS0CKFDUͷ؅ཧ $FOUFS 4JOHMF$IJME3FOEFS 0CKFDU&MFNFOU %FDPSBUFE#PY 1BEEJOH 5FYU 4JOHMF$IJME3FOEFS 0CKFDU&MFNFOU 4JOHMF$IJME3FOEFS 0CKFDU&MFNFOU 4UBUFMFTT&MFNFOU

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3FOEFS0CKFDU w ϨΠΞ΢τܭࢉ΍ϖΠϯτΛߦ ͏ΦϒδΣΫτ w ώοτςετ΋ߦ͏ w 3FOEFS0CKFDU8JEHFUͷ࣋ͭ DSFBUF3FOEFS0CKFDU Ͱ࡞੒ 4JOHMF$IJME3FOEFS 0CKFDU&MFNFOU 4JOHMF$IJME3FOEFS 0CKFDU&MFNFOU 4JOHMF$IJME3FOEFS 0CKFDU&MFNFOU 4UBUFMFTT&MFNFOU 3FOEFS1PTJUJPOFE #PY 3FOEFS%FDPSBUFE #PY 3FOEFS1BEEJOH 3FOEFS1BSBHSBQI

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-BZFS 'SBNFXPSL w 3FOEFS0CKFDUQBJOU Λ௨ͯ͠࡞੒ w 1BJOUJOH$POUFYU w ࢠͷ3FOEFS0CKFDUͷQBJOUΛ ࠶ىతʹݺͼग़͢ w -BZFSΛૠೖPS$BOWBT΁ͷ ॻ͖ࠐΈ w ࠓճͷ3FOEFS0CKFDUͰ͸ऴ୺ͷ 1JDUVSF-BZFSͷΈ࡞੒͞ΕΔ 1JDUVSF-BZFS 3FOEFS1PTJUJPOFE #PY 3FOEFS%FDPSBUFE #PY 3FOEFS1BEEJOH 3FOEFS1BSBHSBQI 1BJOUJOH$POUFYU

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-BZFS &OHJOF w ͔͜͜Β$ʹมΘΔ w &OHJOFଆͰ-BZFSߏ଄Λѻ͑Δ Α͏ʹͨ͠ΦϒδΣΫτ w 4DFOF#VJMEFSʹΑͬͯ࡞੒ w 1JDUVSFΛ%JTQMBZ-JTUʹม׵ w 1JDUVSF͸1BJOUJOH$POUFYUΛ ௨ͨ͠$BOWBT΁ͷॻ͖ࠐΈ 1JDUVSF-BZFS %JTQMBZ-JTU-BZFS

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%JTQMBZ-JTU w %JTQMBZ-JTU-BZFS͕࣋ͭ ඳը໋ྩΛ·ͱΊͨσʔλߏ଄ w 1JDUVSF-BZFS͕͍࣋ͬͯͨ 1JDUVSF͔Βม׵ w %JTQMBZ-JTU#VJMEFS#VJME Ͱ࡞ ੒͞ΕΔ %JTQMBZ-JTU#VJMEFS %JTQMBZ-JTU %JTQMBZ-JTU-BZFS

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0Q w %JTQMBZ-JTUʹ֨ೲ͞ΕΔඳը໋ ྩͷϞσϧ w ৭ృΓɺจࣈྻͷඳըɺը૾ͷ දࣔͱ͍༷ͬͨʑͳ໋ྩ͕͋Δ w %JTQMBZ-JTU#VJMEFSͷ 1VTI5FYU#MPC΍$MJQ1BUIͳͲͰ ࡞੒ %JTQMBZ-JTU %SBX5FYU#MPC0Q 4FU4USPLF8JEUI0Q %SBX$PMPS0Q

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Α͏΍͘*NQFMMFS4LJB 8JEHFU &MFNFOU 3FOEFS0CKFDU -BZFS %JTQMBZ-JTU 0Q *NQFMMFS4LJB

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͜͜Ͱগ͠ωΠςΟϒͷ࿩Λ

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ωΠςΟϒͰͷϨϯμϦϯά w %FWJDF w ந৅Խ͞Εͨ(16 w $PNNBOE#V ff FS w ඳը͢ΔίϚϯυΛ̍·ͱΊʹͨ͠΋ͷ w 2VFVF w $PNNBOE#V ff FSͷ2VFVF w *NQFMMFS΋.FUBM7VMLBOΛ׆༻ w $PNNBOE#V ff FSͷੜ੒͕࠷ऴతͳ໨ඪ .5-$PNNBOE#V ff FS .5-%FWJDF .5-$PNNBOE2VFVF 7L$PNNBOE#V ff FS 7L%FWJDF 7L(SBQIJDT2VFVF (16

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*NQFMMFSTLJBͰͷॲཧ w ͜͜·ͰͷྲྀΕͰ࡞੒ͨ͠0Q͕ %M0Q3FDFJWFSͰॲཧ͞ΕΔ w %M0Q3FDFJWFS͸0QΛड͚औͬ ͯॲཧ w %M0Q3FDFJWFS͸BCTUSBDUͰ࣮ମ ͸4LJB*NQFMMFSʹଘࡏ %M0Q3FDFJWFS %M%JTQBUDIFS %M4L%JTQBUDIFS 0QT *NQFMMFS 4LJB

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*NQFMMFSTLJBͰͷॲཧ 4LJBͷ৔߹ w %M4L%JTQBUDIFS w 4L$BOWBTΛอ࣋ w 4LJBͰఆٛ͞Εͨ$BOWBT w ֤0QΛ4LJBͷೖྗʹม׵ w $BOWBT΁ॻ͖ࠐΈ w ͜ΕҎ߱͸4LJBͷॲཧ %M4L%JTQBUDIFS %M0Q 4L$BOWBT 4LJB 'MVUUFS

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*NQFMMFSTLJBͰͷॲཧ *NQFMMFSͷ৔߹ w %M%JTQBUDIFS w $BOWBTΛอ࣋ w *NQFMMFSͰఆٛ w $BOWBT΁ॻ͖ࠐΈ w &OUJUZ1BTT΁ม׵ w ࠶ͼ໦ߏ଄Λੜ੒ %M%JTQBUDIFS %M0Q *NQFMMFS$BOWBT &OUJUZ1BTT &OUJUZ1BTT &OUJUZ1BTT %SBX1BJOU%SBX1BUI%SBX33FDU

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*NQFMMFSTLJBͰͷॲཧ *NQFMMFSͷ৔߹ w &OUJUZ1BTTͱ͸ w ෳ਺ͷ&OUJUZΛอ࣋ͯ࣍͠ͷ&OUJUZ ͷࢀরΛ࣋ͭ w -BZFSͱࣅͨ੹຿ w &OUJUZͱ͸ʁ w $POUFOUTͷอ࣋ w ࠷ऴతʹ࢖༻͢Δ4IBEFSͳͲ ͷ৘ใΛ࣋ͭ &OUJUZ &OUJUZ1BTT &OUJUZ &OUJUZ &OUJUZ1BTT $POUFOUT &OUJUZ1BTT

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*NQFMMFSTLJBͰͷॲཧ w $POUFOUTΛ3FOEFS1BTT΁௥Ճ w 3FOEFS1BTT w 'MVUUFSଆͷ࠷ऴతͳϞσϧ w ֤άϥϑΟοΫε"1*ͷίϚϯ υ΁ม׵͢Δ໾ׂ w .FUBM7VMLBO(-&4ͦΕͧΕ ͷ࣮ମ͕ଘࡏ 3FOEFS1BTT 3FOEFS1BTT.5- 3FOEFS1BTT7, &OUJUZ &OUJUZ1BTT &OUJUZ &OUJUZ $POUFOUT *NQFMMFSͷ৔߹

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*NQFMMFSTLJBͰͷॲཧ w 3FOEFS1BTT͔Β֤ϓϥοτϑΥʔϜ ͷίϚϯυ΁ม׵ w $PNNBOE#V ff FS͕2VFVFʹੵ·ΕΔ w (16΁ૹ৴͞ΕΔ w ϨϯμϦϯά͞ΕΔʂʂʂ 3FOEFS1BTT.5- 3FOEFS1BTT7, .5-$PNNBOE#V ff FS 7,$PNNBOE#V ff FS .5-$PNNBOE2VFVF (16 7,(SBQIJDT2VFVF *NQFMMFSͷ৔߹

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ϨϯμϦϯάϑϩʔʹ͍ͭͯ

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w 1BUI(FOFSBUJPO w ඳըର৅Λύεʹม׵ w 3BTUFSJ[F w ύε͔ΒඳըྖҬΛࡦఆ w 4IBEJOH w ඳըྖҬͷ৭Λੜ੒ w #MFOEJOH w 3BTUFSJ[Fͱ4IBEJOHͷ݁ՌΛ߹੒ 1BUI(FOFSBUJPO 4IBEJOH 3BTUFSJ[F #MFOEJOH 4L$BOWBT %SBX5FYU#MPC%SBX1BUIʜ 4LJBͷϨϯμϦϯάϑϩʔ

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w 'MVUUFSͰ͸4IBEJOH͕໰୊ʹ w ૢ࡞࣌ʹಈతʹγΣʔμʔΛ ίϯύΠϧ͢Δ w 4L4-͔Β.4-(-4-΁ม׵ w ͜ΕΛ଴ͨͳ͍ͱ͍͚ͳ͍ w ΧΫπΩ͕ൃੜʜ 1BUI(FOFSBUJPO 4IBEJOH 3BTUFSJ[F #MFOEJOH 4L$BOWBT %SBX5FYU#MPC%SBX1BUIʜ 4LJBͷϨϯμϦϯάϑϩʔ

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*NQFMMFSͷϨϯμϦϯάϑϩʔ w 4LJBͱҧ͍%·Ͱ૝ఆ w Ұൠతͳ(16ύΠϓϥΠϯͱ͍ۙ w .FUBM7VMLBOͱ΄΅ಉ͡ߏ੒ w ΑΓࡉ͔͘(16Λѻ͑ΔΑ͏ʹ 3BTUFSJ[BUJPO 7FSUFY4IBEFS 4UFODJM5FTU 'SBHNFOU4IBEFS #MFOEJOH (FPNFUSZ4IBEFS 7FSUFY4IBEFS 'SBHNFOU4IBEFS 3BTUFSJ[BUJPO #MFOEJOH 'MVUUFS 7VMLBO

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*NQFMMFSͷϨϯμϦϯάϑϩʔ w γΣʔμʔʹ͍ͭͯ͸ʁ w ࣄલίϯύΠϧ͞ΕΔΑ͏ʹ w *NQFMMFSDʹΑͬͯϏϧυ͞ΕΔ w γΣʔμʔͷݴޠ΋4L4-͔Β (-4-΁มߋ (-4- 4IBEFS *NQFMMFSD 41*37 .FUBM4IBEFS -BOHVBHF 3F fl FDUPS $#JOEFS .FUBM-JCSBSJFT

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͜͜·Ͱઆ໌͖ͯ͠·͕ͨ͠

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8JEHFU &MFNFOU 3FOEFS0CKFDU -BZFS %JTQMBZ-JTU 0Q *NQFMMFS4LJB

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ͳͥ͜Μͳʹ௕͍ͷ͔ʁ

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JNQFMMFSͷٙ໰఺ w 8JEHFU͔Β*NFQMMFS4LJB·Ͱ͔ͳΓଟ૚ߏ଄ʹͳ͍ͬͯΔ͚Ͳඞཁʁ w ࣮͸%JTQMBZ-JTU͸4LJB಺෦ͱࣅͨΑ͏ͳσʔλߏ଄ w 4LJBνʔϜͰ͸ͳ͘'MVUUFSνʔϜͱͯ͠ϝϯςͰ͖Δ w Ωϟογϡͷ௥ՃͳͲ͕ߦΘΕ͍ͯΔ w 4LJB*NQFMMFSͱ΋ʹγʔϜϨεʹҠߦͰ͖Δ

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*NQFMMFSͰԿ͕มΘ͔ͬͨ ·ͱΊ w γΣʔμʔͷࣄલίϯύΠϧʹΑΓૢ࡞࣌ͷੑೳͷ޲্ w 'MVUUFSνʔϜओಋͰͷվળ w ΑΓ(16ʹ͍ۙϨϯμϦϯάύΠϓϥΠϯͷఏڙ w 'MVUUFS(16Λ͸͡Ίͱͨ͠௿ϨϕϧͳάϥϑΟοΫεૢ࡞ͷఏڙ͕Մೳʹ w ݪཧతʹରԠ͢Δ0Q&OUJUZ͕͋Ε͹ԿͰ΋ϨϯμϦϯάͰ͖Δ