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

by Taketo Yoshida

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1 ·ͩ+1&(Ͱফ໣ͯ͠Δͷʁ ʙ8FC1Ͱ૑Δշద৽ฉϥΠϑʙ ٢ా݈ਓ೔ຊܦࡁ৽ฉࣾσδλϧฤ੒ہฤ੒෦

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2 ೔ຊܦࡁ৽ฉࣾͷJ04ΤϯδχΞ ࣗݾ঺հ ࢴ໘ϏϡʔΞʔΞϓϦͷ։ൃ (JUIVC!UBNBOZBO ٢ా݈ਓ :PTIJEB5BLFUP

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3 গ͠Ͱ΋ը૾ͷ௨৴ྔΛݮΒͯ͠ μ΢ϯϩʔυΛ଎͍ͨ͘͠ʜ

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4 J04্Ͱ8FC1Λ࢖༻ͯ͠ಘͨ ஌ݟΛൃද͠·͢

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5 8FC1ͱ͸ʁ (PPHMF͕։ൃ͍ͯ͠Δը૾ϑΥʔϚοτ ՄٯѹॖͱඇՄٯѹॖͷ྆ํΛαϙʔτ ඇՄٯѹॖͰ͸+1&(ͱൺ΂ͯখ͘͞ͳΔ

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6 ଞࣾͷ࠾༻ࣄྫ

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7 IUUQXXXTMJEFTIBSFOFUTVTJFZZJPTJPT

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8 IUUQUFDIMJGFDPPLQBEDPNFOUSZ

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9 IUUQIPNFTEFTJHOFSTIBUFOBCMPHDPNFOUSZ

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10 ೔ܦͰ͸ࢴ໘ϏϡʔΞʔͰ8FC1Λ࢖༻

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11 ࢴ໘ΠϝʔδΛ8FC1Ͱ഑৴ +1&(ͱಉըૉ਺Ͱ໿ݮ ಉըૉ਺Ͱ΋ϊΠζΛখ͘͞ ˞݄೔ͷேץͰଌఆ

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12 ༰ྔ.#ˠ.# μ΢ϯϩʔυ଎౓ඵˠඵ ˞݄೔ͷேץͰଌఆ

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13 J04ʹͯ8FC1Λѻ͏ʹ͸

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14 MJCXFCQΛ࢖༻͢Δ IUUQTHJUIVCDPNXFCNQSPKFDUMJCXFCQ

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15 private func freeImageData(info: UnsafeMutablePointer, data: UnsafePointer, size: Int) { free(UnsafeMutablePointer(data)) } extension UIImage { static func imageFromWebPData(data: NSData) -> UIImage? { var config = WebPDecoderConfig() if WebPInitDecoderConfig(&config) == 0 { return nil } if WebPGetFeatures(UnsafePointer(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(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

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16 ϙΠϯλʔຬࡌͳΜͰ0CK$Ͱ ॻ͍ͨํָ͕͔΋ʜ

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17 J04Ͱ΋8FC1͸αϙʔτ֎ͳͷʁ

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18 IUUQXXXDOFUDPNOFXTBQQMFJPTNBDPTUFTUTHPPHMFTXFCQHSBQIJDTUPTQFFEVQXFC

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19 αϙʔτŝŦᴸᴸᴸ ƅ˲ƅ ᴸᴸᴸ

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20 J04CFUBͰݕূͯ͠Έͨ

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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） …！？

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23 Ͳ͏͍͏͜ͱͩͬͯ͹Α

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24 5XJUUFSͰௐ΂ͯΈͨ

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27 ΍ͬͺŠŮᴸᴸᴸᴸ "A ᴸᴸᴸᴸ

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28 ࠓͷͱ͜ΖMJCXFCQΛ࢖͏͔͠ͳ͍

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29 8FC1ͷύϑΥʔϚϯε

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30 8FC1ͷύϑΥʔϚϯε ࣮ࡍ+1&(ͱൺֱͨ࣌͠ͷαΠζ͸ʁ μ΢ϯϩʔυ͔Βදࣔ·Ͱʹ͔͔Δ࣌ؒ͸ʁ ը࣭ͷධՁ͸ͲͷΑ͏ʹߦ͏ʁ

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31 ೥݄೔ேץϖʔδ޿ࠂ໘ ˞.#ͷ1/( YQY

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32 QY QY QY QY QY ͭͷαΠζͷը૾+1&(ͱ8Λ༻ҙ͢Δ

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33 ࣮ࡍ+1&(ͱൺֱͨ࣌͠ͷαΠζ͸ʁ

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34 ը૾ͷԣαΠζ QY +1&(ͷαΠζ ,# 8FC1ͷαΠζ ,# dͷαΠζͷ࡟ݮ

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35 μ΢ϯϩʔυ͔Βදࣔ·Ͱʹ  ͔͔Δ࣌ؒ͸ʁ

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36 J04Ͱ8FC1Λ࢖༻͢Δ࣌͸ σίʔυ࣌ؒΛߟྀ͢Δඞཁ͕͋Δ

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37 EPXOMPBE࣌ؒ KQFHEFDPEF࣌ؒ +1&(ͷ৔߹ ࣮࣭ͷμ΢ϯϩʔυ࣌ؒ

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38 EPXOMPBE࣌ؒ XFCQEFDPEF࣌ؒ 8FC1ͷ৔߹ ࣮࣭ͷμ΢ϯϩʔυ࣌ؒ

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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؀ڥJ1IPOFT4PGUCBOL(-5&

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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

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41 ը૾αΠζ͕େ͖͍΄Ͳ ௨৴ίετσίʔυίετ

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42 ৽ฉͷΑ͏ͳըૉ਺͕ଟ͍ը૾ μ΢ϯϩʔυ͢ΔΞϓϦʹ͸༗ޮ

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43 ը࣭ͷධՁ͸ͲͷΑ͏ʹߦ͏ʁ

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44 44*. ͭͷը૾͕Ͳͷఔ౓ࣅ௨͍ͬͯΔ͔Λ൑அ͢Δख๏ Ұൠతʹ44*.ͷ஋͕Ҏ্͋Ε͹ΦϦδφϧͱಉ౳ͷ඼࣭ αΠζΛ཈͑ͭͭྼԽ͠ͳ͍ϥΠϯͰύϥϝʔλΛௐ੔͢Δ

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45 IUUQTHJUIVCDPNKUFSSBDFQZTTJN

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46 ·ͱΊ

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47 ·ͱΊ J04ͷ8FC1ͷαϙʔτΛকདྷతʹ͋Δ͔΋ ըૉ਺͕ଟ͍ը૾Λ࢖͍ͬͯΔͳΒ͹8FC1Λ࢖͏Ձ஋͕͋Δ 44*.Λར༻͢Δ͜ͱͰը࣭ͷධՁ͕Մೳ

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48 5IBOLZPVGPSMJTUFOJOHUPNF