まだJPEGで消耗してるの？/iOSDC-Reject-Conference

http://iosdc-reject-conference.connpass.com/event/37017/ で発表したスライド

Transcript

1. 1 ·ͩ+1&(Ͱফ໣ͯ͠Δͷʁ ʙ8FC1Ͱ૑Δշద৽ฉϥΠϑʙ ٢ా
   ݈ਓ
   ೔ຊܦࡁ৽ฉࣾ
   σδλϧฤ੒ہ
   ฤ੒෦
2. 2 ೔ຊܦࡁ৽ฉࣾͷJ04ΤϯδχΞ ࣗݾ঺հ ࢴ໘ϏϡʔΞʔΞϓϦͷ։ൃ (JUIVC
   !UBNBOZBO ٢ా
   ݈ਓ
   :PTIJEB
   5BLFUP
3. 3 গ͠Ͱ΋ը૾ͷ௨৴ྔΛݮΒͯ͠
   μ΢ϯϩʔυΛ଎͍ͨ͘͠ʜ
4. 4 J04্Ͱ8FC1Λ࢖༻ͯ͠ಘͨ
   ஌ݟΛൃද͠·͢
5. 5 8FC1ͱ͸ʁ (PPHMF͕։ൃ͍ͯ͠Δը૾ϑΥʔϚοτ ՄٯѹॖͱඇՄٯѹॖͷ྆ํΛαϙʔτ ඇՄٯѹॖͰ͸+1&(ͱൺ΂ͯখ͘͞ͳΔ
6. 6 ଞࣾͷ࠾༻ࣄྫ
7. 7 IUUQXXXTMJEFTIBSFOFUTVTJFZZJPTJPT
8. 8 IUUQUFDIMJGFDPPLQBEDPNFOUSZ
9. 9 IUUQIPNFTEFTJHOFSTIBUFOBCMPHDPNFOUSZ
10. 10 ೔ܦͰ͸ࢴ໘ϏϡʔΞʔͰ8FC1Λ࢖༻
11. 11 ࢴ໘ΠϝʔδΛ8FC1Ͱ഑৴ +1&(ͱಉըૉ਺Ͱ໿ݮ ಉըૉ਺Ͱ΋ϊΠζΛখ͘͞ ˞
    ݄೔ͷேץͰଌఆ
12. 12 ༰ྔ
    .#
    ˠ
    .# μ΢ϯϩʔυ଎౓
    ඵ
    ˠ
    ඵ ˞
    ݄೔ͷேץͰଌఆ
13. 13 J04ʹͯ8FC1Λѻ͏ʹ͸
14. 14 MJCXFCQΛ࢖༻͢Δ IUUQTHJUIVCDPNXFCNQSPKFDUMJCXFCQ
15. 15 private func freeImageData(info: UnsafeMutablePointer<Void>, data: UnsafePointer<Void>, size: Int) { free(UnsafeMutablePointer<Void>(data)) } extension UIImage { static func imageFromWebPData(data: NSData) -> UIImage? { var config = WebPDecoderConfig() if WebPInitDecoderConfig(&config) == 0 { return nil } if WebPGetFeatures(UnsafePointer<UInt8>(data.bytes), data.length, &config.input) != VP8_STATUS_OK { return nil } config.output.colorspace = config.input.has_alpha != 0 ? MODE_rgbA : MODE_RGB if WebPDecode(UnsafePointer<UInt8>(data.bytes), data.length, &config) != VP8_STATUS_OK { return nil } let width = config.input.width let height = config.input.height let provider = CGDataProviderCreateWithData(nil, config.output.u.RGBA.rgba, config.output.u.RGBA.size, freeImageData) let colorSpaceRef = CGColorSpaceCreateDeviceRGB() let components = config.input.has_alpha != 0 ? 4 : 3 let bi = config.input.has_alpha != 0 ? CGBitmapInfo(rawValue: CGBitmapInfo.ByteOrderDefault.rawValue | CGImageAlphaInfo.PremultipliedLast.rawValue) : CGBitmapInfo.ByteOrderMask guard let imageRef = CGImageCreate( Int(width), Int(height), 8, components * 8, components * Int(width), colorSpaceRef, bi, provider, nil, true, .RenderingIntentDefault) else { return nil } return UIImage(CGImage: imageRef) } } MJCXFCQΛѻ͍΍͘͢͢ΔͨΊʹ&YUFOTJPOΛॻ͘
16. 16 ϙΠϯλʔຬࡌͳΜͰ0CK$Ͱ
    ॻ͍ͨํָ͕͔΋ʜ
17. 17 J04
    Ͱ΋8FC1͸αϙʔτ֎ͳͷʁ
18. 18 IUUQXXXDOFUDPNOFXTBQQMFJPTNBDPTUFTUTHPPHMFTXFCQHSBQIJDTUPTQFFEVQXFC
19. 19 αϙʔτ
    ŝŦᴸᴸᴸ ƅ˲ƅ ᴸᴸᴸ
20. 20 J04
    
    CFUB
    Ͱݕূͯ͠Έͨ
22. 22 (　ﾟдﾟ) ・・・ 　 (つд⊂)ｺﾞｼｺﾞｼ 　 (；ﾟдﾟ) ・・・ 　 (つд⊂)ｺﾞｼｺﾞｼｺﾞｼ 　　_, ._ （；ﾟ Дﾟ） …！？
23. 23 Ͳ͏͍͏͜ͱͩͬͯ͹Α
24. 24 5XJUUFSͰௐ΂ͯΈͨ
27. 27 ΍ͬͺŠŮᴸᴸᴸᴸ "A ᴸᴸᴸᴸ
28. 28 ࠓͷͱ͜ΖMJCXFCQΛ࢖͏͔͠ͳ͍
29. 29 8FC1ͷύϑΥʔϚϯε
30. 30 8FC1ͷύϑΥʔϚϯε ࣮ࡍ+1&(ͱൺֱͨ࣌͠ͷαΠζ͸ʁ μ΢ϯϩʔυ͔Βදࣔ·Ͱʹ͔͔Δ࣌ؒ͸ʁ ը࣭ͷධՁ͸ͲͷΑ͏ʹߦ͏ʁ
31. 31 ೥݄೔
    ேץ
    ϖʔδ޿ࠂ໘ ˞
    
    .#
    ͷ1/(
    
    Y
    
    QY
32. 32 QY QY QY QY QY ͭͷαΠζͷը૾+1&(ͱ8&#1Λ༻ҙ͢Δ
33. 33 ࣮ࡍ+1&(ͱൺֱͨ࣌͠ͷαΠζ͸ʁ
34. 34 ը૾ͷԣαΠζ QY +1&(ͷαΠζ ,# 8FC1ͷαΠζ ,#                
    d
    ͷαΠζͷ࡟ݮ
35. 35 μ΢ϯϩʔυ͔Βදࣔ·Ͱʹ
 ͔͔Δ࣌ؒ͸ʁ
36. 36 J04Ͱ8FC1Λ࢖༻͢Δ࣌͸
    σίʔυ࣌ؒΛߟྀ͢Δඞཁ͕͋Δ
37. 37 EPXOMPBE࣌ؒ KQFH
    EFDPEF࣌ؒ +1&(ͷ৔߹ ࣮࣭ͷμ΢ϯϩʔυ࣌ؒ
38. 38 EPXOMPBE࣌ؒ XFCQ
    EFDPEF࣌ؒ 8FC1ͷ৔߹ ࣮࣭ͷμ΢ϯϩʔυ࣌ؒ
39. 39 var start = NSDate() [download(url128a), download(url128b), download(url128c), download(url128d), download(url128e)].sequence().then { images in let elapsed = NSDate().timeIntervalSinceDate(start) NSLog(elapsed) } ͭͷϑΝΠϧΛಉ࣌ʹμ΢ϯϩʔυͯ͠6**NBHF·Ͱ
    མͱ͜͠Μͩ࣌ͷ࣌ؒΛ࣮࣭ͷμ΢ϯϩʔυ࣌ؒͱͯ͠ܭଌ ˞
    ࣮ݧ؀ڥ
    J1IPOF
    T
    
    4PGUCBOL
    (
    -5&
40. 40 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 128 256 512 1024 2048 ) ( webp jpeg ը૾αΠζ͕େ͖͍΄Ͳ࣮࣭ͷμ΢ϯϩʔυ࣌ؒ͸୹ॖ͞ΕΔ
41. 41 ը૾αΠζ͕େ͖͍΄Ͳ
    ௨৴ίετ
    
    σίʔυίετ
42. 42 ৽ฉͷΑ͏ͳըૉ਺͕ଟ͍ը૾
    μ΢ϯϩʔυ͢ΔΞϓϦʹ͸༗ޮ
43. 43 ը࣭ͷධՁ͸ͲͷΑ͏ʹߦ͏ʁ
44. 44 44*. ͭͷը૾͕Ͳͷఔ౓ࣅ௨͍ͬͯΔ͔Λ൑அ͢Δख๏ Ұൠతʹ44*.ͷ஋͕Ҏ্͋Ε͹ΦϦδφϧͱಉ౳ͷ඼࣭ αΠζΛ཈͑ͭͭྼԽ͠ͳ͍ϥΠϯͰύϥϝʔλΛௐ੔͢Δ
45. 45 IUUQTHJUIVCDPNKUFSSBDFQZTTJN
46. 46 ·ͱΊ
47. 47 ·ͱΊ J04ͷ8FC1ͷαϙʔτΛকདྷతʹ͋Δ͔΋ ըૉ਺͕ଟ͍ը૾Λ࢖͍ͬͯΔͳΒ͹8FC1Λ࢖͏Ձ஋͕͋Δ 44*.Λར༻͢Δ͜ͱͰը࣭ͷධՁ͕Մೳ
48. 48 5IBOL
    ZPV
    GPS
    MJTUFOJOH
    UP
    NF