{"id":23798,"date":"2022-11-28T11:25:42","date_gmt":"2022-11-28T05:55:42","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-how-to-quickly-transform-from-rgb24-to-bgra-on-ios\/"},"modified":"2022-11-28T11:25:42","modified_gmt":"2022-11-28T05:55:42","slug":"solved-how-to-quickly-transform-from-rgb24-to-bgra-on-ios","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-how-to-quickly-transform-from-rgb24-to-bgra-on-ios\/","title":{"rendered":"[Solved] How to quickly transform from RGB24 to BGRA on iOS?"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-11719463\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"11719463\" data-parentid=\"11699151\" data-score=\"1\" data-position-on-page=\"1\" data-highest-scored=\"1\" data-question-has-accepted-highest-score=\"1\" itemprop=\"acceptedAnswer\" itemscope itemtype=\"https:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\"><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"s-prose js-post-body\" itemprop=\"text\">\n<p>Now I found the fastest solution is assembly. Just like this:<\/p>\n<pre><code>__asm__ volatile(\n                 \"0:                \\n\"\n                 \"# load 3 64-bit regs with interleave: \\n\"\n                 \"vld3.8      {d0,d1,d2}, [%0]!   \\n\"\n                 \"# swap d0 and d2 - R and B\\n\"\n                 \"vswp d0, d2   \\n\"\n                 \"# store 4 64-bit regs: \\n\"\n                 \"vst4.8      {d0,d1,d2,d3}, [%2]!      \\n\"\n                 \"subs        %1, %1, #1       \\n\"\n                 \"bne         0b            \\n\"\n                 :\n                 : \"r\"(img), \"r\"(numPixels24), \"+r\"(bgraData)\n                 : \"r6\", \"r7\",\"r8\"\n                 );\n<\/code><\/pre>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\"><\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved How to quickly transform from RGB24 to BGRA on iOS? <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] Now I found the fastest solution is assembly. Just like this: __asm__ volatile( &#8220;0: \\n&#8221; &#8220;# load 3 64-bit regs with interleave: \\n&#8221; &#8220;vld3.8 {d0,d1,d2}, [%0]! \\n&#8221; &#8220;# swap d0 and d2 &#8211; R and B\\n&#8221; &#8220;vswp d0, d2 \\n&#8221; &#8220;# store 4 64-bit regs: \\n&#8221; &#8220;vst4.8 {d0,d1,d2,d3}, [%2]! \\n&#8221; &#8220;subs %1, %1, #1 &#8230; <a title=\"[Solved] How to quickly transform from RGB24 to BGRA on iOS?\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-how-to-quickly-transform-from-rgb24-to-bgra-on-ios\/\" aria-label=\"More on [Solved] How to quickly transform from RGB24 to BGRA on iOS?\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[471,2410,2473,636,1024],"class_list":["post-23798","post","type-post","status-publish","format-standard","hentry","category-solved","tag-ios","tag-rgb","tag-rgba","tag-time","tag-transform"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] How to quickly transform from RGB24 to BGRA on iOS? - JassWeb<\/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:\/\/jassweb.com\/solved\/solved-how-to-quickly-transform-from-rgb24-to-bgra-on-ios\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] How to quickly transform from RGB24 to BGRA on iOS? - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] Now I found the fastest solution is assembly. Just like this: __asm__ volatile( &quot;0: n&quot; &quot;# load 3 64-bit regs with interleave: n&quot; &quot;vld3.8 {d0,d1,d2}, [%0]! n&quot; &quot;# swap d0 and d2 - R and Bn&quot; &quot;vswp d0, d2 n&quot; &quot;# store 4 64-bit regs: n&quot; &quot;vst4.8 {d0,d1,d2,d3}, [%2]! n&quot; &quot;subs %1, %1, #1 ... Read more\" \/>\n<meta property=\"og:url\" content=\"https:\/\/jassweb.com\/solved\/solved-how-to-quickly-transform-from-rgb24-to-bgra-on-ios\/\" \/>\n<meta property=\"og:site_name\" content=\"JassWeb\" \/>\n<meta property=\"article:published_time\" content=\"2022-11-28T05:55:42+00:00\" \/>\n<meta name=\"author\" content=\"Kirat\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Kirat\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/jassweb.com\/solved\/solved-how-to-quickly-transform-from-rgb24-to-bgra-on-ios\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/jassweb.com\/solved\/solved-how-to-quickly-transform-from-rgb24-to-bgra-on-ios\/\"},\"author\":{\"name\":\"Kirat\",\"@id\":\"https:\/\/jassweb.com\/solved\/#\/schema\/person\/65c9c7b7958150c0dc8371fa35dd7c31\"},\"headline\":\"[Solved] How to quickly transform from RGB24 to BGRA on iOS?\",\"datePublished\":\"2022-11-28T05:55:42+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/jassweb.com\/solved\/solved-how-to-quickly-transform-from-rgb24-to-bgra-on-ios\/\"},\"wordCount\":35,\"publisher\":{\"@id\":\"https:\/\/jassweb.com\/solved\/#organization\"},\"keywords\":[\"ios\",\"rgb\",\"rgba\",\"time\",\"transform\"],\"articleSection\":[\"Solved\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/jassweb.com\/solved\/solved-how-to-quickly-transform-from-rgb24-to-bgra-on-ios\/\",\"url\":\"https:\/\/jassweb.com\/solved\/solved-how-to-quickly-transform-from-rgb24-to-bgra-on-ios\/\",\"name\":\"[Solved] How to quickly transform from RGB24 to BGRA on iOS? 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Just like this: __asm__ volatile( \"0: n\" \"# load 3 64-bit regs with interleave: n\" \"vld3.8 {d0,d1,d2}, [%0]! n\" \"# swap d0 and d2 - R and Bn\" \"vswp d0, d2 n\" \"# store 4 64-bit regs: n\" \"vst4.8 {d0,d1,d2,d3}, [%2]! n\" \"subs %1, %1, #1 ... 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