{"id":44879,"date":"2023-04-01T17:26:30","date_gmt":"2023-02-04T12:09:57","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/44879-2\/"},"modified":"2024-04-29T21:30:08","modified_gmt":"2024-04-29T13:30:08","slug":"44879-2","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/44879-2\/","title":{"rendered":""},"content":{"rendered":"

Composite<\/h2>\n

image\/draw\u306eDraw\u3092\u4f7f\u3046\u3002
\n\u30de\u30b9\u30af\u3092\u304b\u3051\u308b\u3068\u304d\u306fDrawMask\u3002<\/p>\n

Scale<\/h2>\n

golang.org\/x\/image\/draw\u3092\u4f7f\u3046\u3002image\/draw\u306e\u30b9\u30fc\u30d1\u30fc\u30bb\u30c3\u30c8\u306b\u306a\u3063\u3066\u3044\u308b\u3002
\nScale\u7528\u306bScaler\u3068\u3044\u3046interface\u304c\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u3066\u3001BiLinear\u3068\u304bCatmullRom\u3068\u304b\u3044\u304f\u3064\u304b\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u304c\u63d0\u4f9b\u3055\u308c\u3066\u3044\u308b\u3002<\/p>\n

func (*Kernel) Scale \u3067scale\u3059\u308b\u3002<\/p>\n

png\u3068\u304bjpeg<\/h2>\n

image\/png\u3084image\/jpeg\u306eDecode, Encode\u3092\u4f7f\u3046\u3002
\n\u4ee5\u4e0b\u306e\u3088\u3046\u306bimage\/png\u3084image\/jpeg\u3092blank import\u3057\u3066\u304a\u304f\u3068\u753b\u50cf\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3092\u3088\u3057\u306a\u306b\u30c7\u30b3\u30fc\u30c9\u3057\u3066\u304f\u308c\u308b\u3002<\/p>\n

import<\/span> (<\/span>\r\n    \"image\"<\/span>\r\n    _<\/span> \"image\/jpeg\"<\/span>\r\n    _<\/span> \"image\/png\"<\/span>\r\n)<\/span>\r\n\r\nfunc<\/span> decode<\/span>(<\/span>src<\/span> io<\/span>.<\/span>Reader<\/span>)<\/span> {<\/span>\r\n    im<\/span>,<\/span> t<\/span>,<\/span> err<\/span> :=<\/span> image<\/span>.<\/span>Decode<\/span>(<\/span>src<\/span>)<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
pixel\u5024\u53d6\u5f97<\/h2>\n
image.Image interface\u306eAt\u3092\u4f7f\u3046\u3002<\/p>\n
r<\/span>,<\/span> g<\/span>,<\/span> b<\/span> ,<\/span>a<\/span> :=<\/span> im<\/span>.<\/span>At<\/span>(<\/span>x<\/span>,<\/span> y<\/span>)<\/span>.<\/span>RGBA<\/span>()<\/span>\r\n<\/code><\/pre>\n
pixel\u5024\u8a2d\u5b9a<\/h2>\n
image.RGBA \u7b49\u306fSet\u30e1\u30bd\u30c3\u30c9\u304c\u3042\u308b\u306e\u3067\u3053\u308c\u3067pixel\u5024\u3092\u8a2d\u5b9a\u3067\u304d\u308b\u3002
\nimage.Image interface\u306b\u306fSet\u304c\u306a\u3044\u306e\u3067png.Decode\u7b49\u3067\u5f97\u305f\u3042\u3068\u306f<\/p>\n
type<\/span> Setter<\/span> interface<\/span> {<\/span>\r\n    Set<\/span>(<\/span>x<\/span>,<\/span> y<\/span> int<\/span>,<\/span> c<\/span> color<\/span>.<\/span>Color<\/span>)<\/span>\r\n}<\/span>\r\n\r\nif<\/span> sim<\/span>,<\/span> ok<\/span> :=<\/span> im<\/span>.<\/span>(<\/span>Setter<\/span>);<\/span> ok<\/span> {<\/span>\r\n    \/\/ ...<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u3068\u3044\u3046\u3088\u3046\u306binterface\u5b9a\u7fa9\u3057\u3066\u578b\u30a2\u30b5\u30fc\u30b7\u30e7\u30f3\u3092\u304b\u3051\u308b\u3002<\/p>\n
Crop<\/h2>\n
image.RGBA \u7b49\u306fSubImage\u30e1\u30bd\u30c3\u30c9\u304c\u3042\u308b\u306e\u3067\u3053\u308c\u3067Crop\u3067\u304d\u308b\u3002
\nimage.Image interface\u306b\u306fSubImage\u304c\u306a\u3044\u306e\u3067png.Decode\u7b49\u3067\u5f97\u305f\u3042\u3068\u306f<\/p>\n
type<\/span> SubImager<\/span> interface<\/span> {<\/span>\r\n    SubImage<\/span>(<\/span>r<\/span> image<\/span>.<\/span>Rectangle<\/span>)<\/span> image<\/span>.<\/span>Image<\/span>\r\n}<\/span>\r\n\r\nif<\/span> sim<\/span>,<\/span> ok<\/span> :=<\/span> im<\/span>.<\/span>(<\/span>SubImager<\/span>);<\/span> ok<\/span> {<\/span>\r\n    \/\/ ...<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u3068\u3044\u3046\u3088\u3046\u306binterface\u5b9a\u7fa9\u3057\u3066\u578b\u30a2\u30b5\u30fc\u30b7\u30e7\u30f3\u3092\u304b\u3051\u308b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
Composite image\/draw\u306eDraw\u3092\u4f7f\u3046\u3002 \u30de\u30b9\u30af\u3092\u304b\u3051\u308b\u3068\u304d\u306fDrawMask\u3002 Scale […]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-44879","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\n- Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/44879-2\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:description\" content=\"Composite image\/draw\u306eDraw\u3092\u4f7f\u3046\u3002 \u30de\u30b9\u30af\u3092\u304b\u3051\u308b\u3068\u304d\u306fDrawMask\u3002 Scale […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/44879-2\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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