{"id":199600,"date":"2023-08-07T18:26:25","date_gmt":"2023-08-07T10:26:25","guid":{"rendered":"https:\/\/www.idc.net\/help\/199600\/"},"modified":"2023-08-07T18:26:25","modified_gmt":"2023-08-07T10:26:25","slug":"%e4%b8%ba%e4%bb%80%e4%b9%88android%e7%9a%84%e5%9b%be%e7%89%87%e8%b4%a8%e9%87%8f%e6%b2%a1%e6%9c%89ios%e7%9a%84%e9%ab%98%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/idc.net\/help\/199600\/","title":{"rendered":"\u4e3a\u4ec0\u4e48Android\u7684\u56fe\u7247\u8d28\u91cf\u6ca1\u6709iOS\u7684\u9ad8\uff1f"},"content":{"rendered":"

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[[132494]]<\/span><\/p>\n

\u8c37\u6b4c\u7684\u9519\u5c31\u5728\u4e8e\uff1alibjpeg\u3002<\/p>\n

libjpeg\u662f\u5e7f\u6cdb\u4f7f\u7528\u7684\u5f00\u6e90JPEG\u56fe\u50cf\u5e93\uff08\u53c2\u8003 http:\/\/en.wikipedia.org\/wiki\/Libjpeg \uff09\uff0c\u5b89\u5353\u4e5f\u4f9d\u8d56libjpeg\u6765\u538b\u7f29\u56fe\u7247\u3002\u901a\u8fc7\u67e5\u770b\u6e90\u7801\uff0c\u6211\u4eec\u4f1a\u53d1\u73b0\u5b89\u5353\u5e76\u4e0d\u662f\u76f4\u63a5\u5c01\u88c5\u7684libjpeg\uff0c\u800c\u662f\u57fa\u4e8e\u4e86\u53e6\u4e00\u4e2a\u53ebSkia\u7684\u5f00\u6e90\u9879\u76ee\uff08http:\/\/en.wikipedia.org\/wiki\/Skia_Graphics_Engine\uff09\u6765\u4f5c\u4e3a\u7684\u56fe\u50cf\u5904\u7406\u5f15\u64ce\u3002Skia\u662f\u8c37\u6b4c\u81ea\u5df1\u7ef4\u62a4\u7740\u7684\u4e00\u4e2a\u5927\u800c\u5168\u7684\u5f15\u64ce\uff0c\u5404\u79cd\u56fe\u50cf\u5904\u7406\u529f\u80fd\u5747\u5728\u5176\u4e2d\u4e88\u4ee5\u5b9e\u73b0\uff0c\u5e76\u4e14\u5e7f\u6cdb\u7684\u5e94\u7528\u4e8e\u8c37\u6b4c\u81ea\u5df1\u548c\u5176\u5b83\u516c\u53f8\u7684\u4ea7\u54c1\u4e2d\uff08\u5982\uff1aChrome\u3001Firefox\u3001Android\u7b49\uff09\u3002Skia\u5bf9libjpeg\u8fdb\u884c\u4e86\u826f\u597d\u7684\u5c01\u88c5\uff0c\u57fa\u4e8e\u8fd9\u4e2a\u5f15\u64ce\u53ef\u4ee5\u5f88\u65b9\u4fbf\u4e3a\u64cd\u4f5c\u7cfb\u7edf\u3001\u6d4f\u89c8\u5668\u7b49\u5f00\u53d1\u56fe\u50cf\u5904\u7406\u529f\u80fd\u3002<\/p>\n

ibjpeg\u5728\u538b\u7f29\u56fe\u50cf\u65f6\uff0c\u6709\u4e00\u4e2a\u53c2\u6570\u53eboptimize_coding\uff0c\u5173\u4e8e\u8fd9\u4e2a\u53c2\u6570\uff0clibjpeg.doc\u6709\u5982\u4e0b\u89e3\u91ca\uff1a<\/p>\n

boolean optimize_coding
TRUE causes the compressor to compute optimal Huffman coding tables
for the image. This requires an extra pass over the data and
therefore costs a good deal of space and time. The default is
FALSE, which tells the compressor to use the supplied or default
Huffman tables. In most cases optimal tables save only a few percent
of file size compared to the default tables. Note that when this is
TRUE, you need not supply Huffman tables at all, and any you do
supply will be overwritten.<\/p>\n

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\u8c37\u6b4c\u7684Skia\u9879\u76ee\u5de5\u7a0b\u5e08\u4eec\u6700\u7ec8\u6ca1\u6709\u8bbe\u7f6e\u8fd9\u4e2a\u53c2\u6570\uff0coptimize_coding\u5728Skia\u4e2d\u9ed8\u8ba4\u7684\u7b49\u4e8e\u4e86FALSE\uff0c\u8fd9\u5c31\u610f\u5473\u7740\u66f4\u5dee\u7684\u56fe\u7247\u8d28\u91cf\u548c\u66f4\u5927\u7684\u56fe\u7247\u6587\u4ef6\uff0c\u800c\u538b\u7f29\u56fe\u7247\u8fc7\u7a0b\u4e2d\u6240\u8017\u8d39\u7684\u65f6\u95f4\u548c\u7a7a\u95f4\u5176\u5b9e\u53cd\u800c\u662f\u53ef\u4ee5\u5ffd\u7565\u4e0d\u8ba1\u7684\u3002\u90a3\u4e48\uff0c\u8fd9\u4e2a\u53c2\u6570\u7684\u5f71\u54cd\u7a76\u7adf\u4f1a\u6709\u591a\u5927\u5462\uff1f<\/p>\n

\u7ecf\u6211\u4eec\u5b9e\u6d4b\uff0c\u4f7f\u7528\u76f8\u540c\u7684\u539f\u59cb\u56fe\u7247\uff0c\u5206\u522b\u8bbe\u7f6eoptimize_coding=TRUE\u548cFALSE\u8fdb\u884c\u538b\u7f29\uff0c\u60f3\u8fbe\u5230\u63a5\u8fd1\u7684\u56fe\u7247\u8d28\u91cf\uff08\u7528Photoshop\u653e\u5927\u5230\u50cf\u7d20\u7ea7\u9010\u5757\u5bf9\u6bd4\uff09\uff0cFALSE\u65f6\u7684\u56fe\u7247\u5927\u5c0f\u5927\u7ea6\u662fTRUE\u65f6\u76845-10\u500d\u3002\u6362\u53e5\u8bdd\u8bf4\uff0c\u5982\u679c\u6211\u4eec\u60f3\u5728FALSE\u548cTRUE\u65f6\u538b\u7f29\u6210\u76f8\u540c\u5927\u5c0f\u7684JPEG\u56fe\u7247\uff0cFALSE\u7684\u54c1\u8d28\u5c06\u5927\u5927\u900a\u8272\u4e8eTRUE\u7684\uff08\u867d\u7136\u54c1\u8d28\u5f88\u96be\u91cf\u5316\uff0c\u4f46\u6211\u4eec\u4e0d\u59a8\u8bf4\u6210\u662f\u5dee5-10\u500d\uff09\u3002<\/p>\n

\u6211\u4eec\u53c8\u5bf9Android\u548ciOS\u8fdb\u884c\u4e86\u5bf9\u6bd4\uff08\u5747\u4f7f\u7528\u6807\u51c6\u7684JPEG\u538b\u7f29\u65b9\u6cd5\uff09\uff0c\u4e24\u4e2a\u7cfb\u7edf\u90fd\u6ca1\u6709\u63d0\u4f9b\u8bbe\u7f6eoptimize_coding\u7684\u63a5\u53e3\uff08\u901a\u8fc7\u9605\u8bfb\u6e90\u7801\uff0c\u6211\u4eec\u5df2\u7ecf\u77e5\u9053Android\u662fFALSE\uff0ciOS\u4e0d\u8be6\uff09\uff0c\u5f53\u538b\u7f29\u76f8\u540c\u7684\u539f\u59cb\u56fe\u7247\u65f6\uff0c\u7ed3\u679c\u4e5f\u662f\u4e00\u6837\uff0ciOS\u5b8c\u80dc\u3002\u60f3\u8981\u54c1\u8d28\u63a5\u8fd1\uff0c\u6587\u4ef6\u5927\u5c0f\u5c31\u4f1a\u5dee\u51fa5-10\u500d\uff0c\u800c\u5982\u679c\u8981\u538b\u7f29\u51fa\u76f8\u540c\u5927\u5c0f\u7684\u6587\u4ef6\uff0cAndroid\u7684\u538b\u7f29\u54c1\u8d28\u7b80\u76f4\u5c31\u662f\u60e8\u4e0d\u5fcd\u7779\u3002<\/p>\n

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***\uff0c\u9644\u4e0a\u6211\u4eec\u56e2\u961f\u5728github\u4e0a\u7684\u5f00\u6e90\u9879\u76ee\u5730\u5740\uff0c\u4f9b\u53c2\u8003\uff1ahttps:\/\/github.com\/bither<\/p>\n","protected":false},"excerpt":{"rendered":"

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