blob: f4cc1c666b27254fc1fba93ebd6d71c99e5fb734 [file] [log] [blame]
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<!--[if IE]><meta http-equiv="X-UA-Compatible" content="IE=edge"><![endif]-->
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="generator" content="Asciidoctor 1.5.8">
<title>cl_image_desc(3)</title>
<style>
/*! normalize.css v2.1.2 | MIT License | git.io/normalize */
/* ========================================================================== HTML5 display definitions ========================================================================== */
/** Correct `block` display not defined in IE 8/9. */
article, aside, details, figcaption, figure, footer, header, hgroup, main, nav, section, summary { display: block; }
/** Correct `inline-block` display not defined in IE 8/9. */
audio, canvas, video { display: inline-block; }
/** Prevent modern browsers from displaying `audio` without controls. Remove excess height in iOS 5 devices. */
audio:not([controls]) { display: none; height: 0; }
/** Address `[hidden]` styling not present in IE 8/9. Hide the `template` element in IE, Safari, and Firefox < 22. */
[hidden], template { display: none; }
script { display: none !important; }
/* ========================================================================== Base ========================================================================== */
/** 1. Set default font family to sans-serif. 2. Prevent iOS text size adjust after orientation change, without disabling user zoom. */
html { font-family: sans-serif; /* 1 */ -ms-text-size-adjust: 100%; /* 2 */ -webkit-text-size-adjust: 100%; /* 2 */ }
/** Remove default margin. */
body { margin: 0; }
/* ========================================================================== Links ========================================================================== */
/** Remove the gray background color from active links in IE 10. */
a { background: transparent; }
/** Address `outline` inconsistency between Chrome and other browsers. */
a:focus { outline: thin dotted; }
/** Improve readability when focused and also mouse hovered in all browsers. */
a:active, a:hover { outline: 0; }
/* ========================================================================== Typography ========================================================================== */
/** Address variable `h1` font-size and margin within `section` and `article` contexts in Firefox 4+, Safari 5, and Chrome. */
h1 { font-size: 2em; margin: 0.67em 0; }
/** Address styling not present in IE 8/9, Safari 5, and Chrome. */
abbr[title] { border-bottom: 1px dotted; }
/** Address style set to `bolder` in Firefox 4+, Safari 5, and Chrome. */
b, strong { font-weight: bold; }
/** Address styling not present in Safari 5 and Chrome. */
dfn { font-style: italic; }
/** Address differences between Firefox and other browsers. */
hr { -moz-box-sizing: content-box; box-sizing: content-box; height: 0; }
/** Address styling not present in IE 8/9. */
mark { background: #ff0; color: #000; }
/** Correct font family set oddly in Safari 5 and Chrome. */
code, kbd, pre, samp { font-family: monospace, serif; font-size: 1em; }
/** Improve readability of pre-formatted text in all browsers. */
pre { white-space: pre-wrap; }
/** Set consistent quote types. */
q { quotes: "\201C" "\201D" "\2018" "\2019"; }
/** Address inconsistent and variable font size in all browsers. */
small { font-size: 80%; }
/** Prevent `sub` and `sup` affecting `line-height` in all browsers. */
sub, sup { font-size: 75%; line-height: 0; position: relative; vertical-align: baseline; }
sup { top: -0.5em; }
sub { bottom: -0.25em; }
/* ========================================================================== Embedded content ========================================================================== */
/** Remove border when inside `a` element in IE 8/9. */
img { border: 0; }
/** Correct overflow displayed oddly in IE 9. */
svg:not(:root) { overflow: hidden; }
/* ========================================================================== Figures ========================================================================== */
/** Address margin not present in IE 8/9 and Safari 5. */
figure { margin: 0; }
/* ========================================================================== Forms ========================================================================== */
/** Define consistent border, margin, and padding. */
fieldset { border: 1px solid #c0c0c0; margin: 0 2px; padding: 0.35em 0.625em 0.75em; }
/** 1. Correct `color` not being inherited in IE 8/9. 2. Remove padding so people aren't caught out if they zero out fieldsets. */
legend { border: 0; /* 1 */ padding: 0; /* 2 */ }
/** 1. Correct font family not being inherited in all browsers. 2. Correct font size not being inherited in all browsers. 3. Address margins set differently in Firefox 4+, Safari 5, and Chrome. */
button, input, select, textarea { font-family: inherit; /* 1 */ font-size: 100%; /* 2 */ margin: 0; /* 3 */ }
/** Address Firefox 4+ setting `line-height` on `input` using `!important` in the UA stylesheet. */
button, input { line-height: normal; }
/** Address inconsistent `text-transform` inheritance for `button` and `select`. All other form control elements do not inherit `text-transform` values. Correct `button` style inheritance in Chrome, Safari 5+, and IE 8+. Correct `select` style inheritance in Firefox 4+ and Opera. */
button, select { text-transform: none; }
/** 1. Avoid the WebKit bug in Android 4.0.* where (2) destroys native `audio` and `video` controls. 2. Correct inability to style clickable `input` types in iOS. 3. Improve usability and consistency of cursor style between image-type `input` and others. */
button, html input[type="button"], input[type="reset"], input[type="submit"] { -webkit-appearance: button; /* 2 */ cursor: pointer; /* 3 */ }
/** Re-set default cursor for disabled elements. */
button[disabled], html input[disabled] { cursor: default; }
/** 1. Address box sizing set to `content-box` in IE 8/9. 2. Remove excess padding in IE 8/9. */
input[type="checkbox"], input[type="radio"] { box-sizing: border-box; /* 1 */ padding: 0; /* 2 */ }
/** 1. Address `appearance` set to `searchfield` in Safari 5 and Chrome. 2. Address `box-sizing` set to `border-box` in Safari 5 and Chrome (include `-moz` to future-proof). */
input[type="search"] { -webkit-appearance: textfield; /* 1 */ -moz-box-sizing: content-box; -webkit-box-sizing: content-box; /* 2 */ box-sizing: content-box; }
/** Remove inner padding and search cancel button in Safari 5 and Chrome on OS X. */
input[type="search"]::-webkit-search-cancel-button, input[type="search"]::-webkit-search-decoration { -webkit-appearance: none; }
/** Remove inner padding and border in Firefox 4+. */
button::-moz-focus-inner, input::-moz-focus-inner { border: 0; padding: 0; }
/** 1. Remove default vertical scrollbar in IE 8/9. 2. Improve readability and alignment in all browsers. */
textarea { overflow: auto; /* 1 */ vertical-align: top; /* 2 */ }
/* ========================================================================== Tables ========================================================================== */
/** Remove most spacing between table cells. */
table { border-collapse: collapse; border-spacing: 0; }
meta.foundation-mq-small { font-family: "only screen and (min-width: 768px)"; width: 768px; }
meta.foundation-mq-medium { font-family: "only screen and (min-width:1280px)"; width: 1280px; }
meta.foundation-mq-large { font-family: "only screen and (min-width:1440px)"; width: 1440px; }
*, *:before, *:after { -moz-box-sizing: border-box; -webkit-box-sizing: border-box; box-sizing: border-box; }
html, body { font-size: 100%; }
body { background: white; color: #222222; padding: 0; margin: 0; font-family: "Helvetica Neue", "Helvetica", Helvetica, Arial, sans-serif; font-weight: normal; font-style: normal; line-height: 1; position: relative; cursor: auto; }
a:hover { cursor: pointer; }
img, object, embed { max-width: 100%; height: auto; }
object, embed { height: 100%; }
img { -ms-interpolation-mode: bicubic; }
#map_canvas img, #map_canvas embed, #map_canvas object, .map_canvas img, .map_canvas embed, .map_canvas object { max-width: none !important; }
.left { float: left !important; }
.right { float: right !important; }
.text-left { text-align: left !important; }
.text-right { text-align: right !important; }
.text-center { text-align: center !important; }
.text-justify { text-align: justify !important; }
.hide { display: none; }
.antialiased { -webkit-font-smoothing: antialiased; }
img { display: inline-block; vertical-align: middle; }
textarea { height: auto; min-height: 50px; }
select { width: 100%; }
object, svg { display: inline-block; vertical-align: middle; }
.center { margin-left: auto; margin-right: auto; }
.spread { width: 100%; }
p.lead, .paragraph.lead > p, #preamble > .sectionbody > .paragraph:first-of-type p { font-size: 1.21875em; line-height: 1.6; }
.subheader, .admonitionblock td.content > .title, .audioblock > .title, .exampleblock > .title, .imageblock > .title, .listingblock > .title, .literalblock > .title, .stemblock > .title, .openblock > .title, .paragraph > .title, .quoteblock > .title, table.tableblock > .title, .verseblock > .title, .videoblock > .title, .dlist > .title, .olist > .title, .ulist > .title, .qlist > .title, .hdlist > .title { line-height: 1.4; color: black; font-weight: 300; margin-top: 0.2em; margin-bottom: 0.5em; }
/* Typography resets */
div, dl, dt, dd, ul, ol, li, h1, h2, h3, #toctitle, .sidebarblock > .content > .title, h4, h5, h6, pre, form, p, blockquote, th, td { margin: 0; padding: 0; direction: ltr; }
/* Default Link Styles */
a { color: #0068b0; text-decoration: none; line-height: inherit; }
a:hover, a:focus { color: #333333; }
a img { border: none; }
/* Default paragraph styles */
p { font-family: Noto, sans-serif; font-weight: normal; font-size: 1em; line-height: 1.6; margin-bottom: 0.75em; text-rendering: optimizeLegibility; }
p aside { font-size: 0.875em; line-height: 1.35; font-style: italic; }
/* Default header styles */
h1, h2, h3, #toctitle, .sidebarblock > .content > .title, h4, h5, h6 { font-family: Noto, sans-serif; font-weight: normal; font-style: normal; color: black; text-rendering: optimizeLegibility; margin-top: 0.5em; margin-bottom: 0.5em; line-height: 1.2125em; }
h1 small, h2 small, h3 small, #toctitle small, .sidebarblock > .content > .title small, h4 small, h5 small, h6 small { font-size: 60%; color: #4d4d4d; line-height: 0; }
h1 { font-size: 2.125em; }
h2 { font-size: 1.6875em; }
h3, #toctitle, .sidebarblock > .content > .title { font-size: 1.375em; }
h4 { font-size: 1.125em; }
h5 { font-size: 1.125em; }
h6 { font-size: 1em; }
hr { border: solid #dddddd; border-width: 1px 0 0; clear: both; margin: 1.25em 0 1.1875em; height: 0; }
/* Helpful Typography Defaults */
em, i { font-style: italic; line-height: inherit; }
strong, b { font-weight: bold; line-height: inherit; }
small { font-size: 60%; line-height: inherit; }
code { font-family: Consolas, "Liberation Mono", Courier, monospace; font-weight: normal; color: #264357; }
/* Lists */
ul, ol, dl { font-size: 1em; line-height: 1.6; margin-bottom: 0.75em; list-style-position: outside; font-family: Noto, sans-serif; }
ul, ol { margin-left: 1.5em; }
ul.no-bullet, ol.no-bullet { margin-left: 1.5em; }
/* Unordered Lists */
ul li ul, ul li ol { margin-left: 1.25em; margin-bottom: 0; font-size: 1em; /* Override nested font-size change */ }
ul.square li ul, ul.circle li ul, ul.disc li ul { list-style: inherit; }
ul.square { list-style-type: square; }
ul.circle { list-style-type: circle; }
ul.disc { list-style-type: disc; }
ul.no-bullet { list-style: none; }
/* Ordered Lists */
ol li ul, ol li ol { margin-left: 1.25em; margin-bottom: 0; }
/* Definition Lists */
dl dt { margin-bottom: 0.3em; font-weight: bold; }
dl dd { margin-bottom: 0.75em; }
/* Abbreviations */
abbr, acronym { text-transform: uppercase; font-size: 90%; color: black; border-bottom: 1px dotted #dddddd; cursor: help; }
abbr { text-transform: none; }
/* Blockquotes */
blockquote { margin: 0 0 0.75em; padding: 0.5625em 1.25em 0 1.1875em; border-left: 1px solid #dddddd; }
blockquote cite { display: block; font-size: 0.8125em; color: #5e93b8; }
blockquote cite:before { content: "\2014 \0020"; }
blockquote cite a, blockquote cite a:visited { color: #5e93b8; }
blockquote, blockquote p { line-height: 1.6; color: #333333; }
/* Microformats */
.vcard { display: inline-block; margin: 0 0 1.25em 0; border: 1px solid #dddddd; padding: 0.625em 0.75em; }
.vcard li { margin: 0; display: block; }
.vcard .fn { font-weight: bold; font-size: 0.9375em; }
.vevent .summary { font-weight: bold; }
.vevent abbr { cursor: auto; text-decoration: none; font-weight: bold; border: none; padding: 0 0.0625em; }
@media only screen and (min-width: 768px) { h1, h2, h3, #toctitle, .sidebarblock > .content > .title, h4, h5, h6 { line-height: 1.4; }
h1 { font-size: 2.75em; }
h2 { font-size: 2.3125em; }
h3, #toctitle, .sidebarblock > .content > .title { font-size: 1.6875em; }
h4 { font-size: 1.4375em; } }
/* Tables */
table { background: white; margin-bottom: 1.25em; border: solid 1px #d8d8ce; }
table thead, table tfoot { background: -webkit-linear-gradient(top, #add386, #90b66a); font-weight: bold; }
table thead tr th, table thead tr td, table tfoot tr th, table tfoot tr td { padding: 0.5em 0.625em 0.625em; font-size: inherit; color: white; text-align: left; }
table tr th, table tr td { padding: 0.5625em 0.625em; font-size: inherit; color: #6d6e71; }
table tr.even, table tr.alt, table tr:nth-of-type(even) { background: #edf2f2; }
table thead tr th, table tfoot tr th, table tbody tr td, table tr td, table tfoot tr td { display: table-cell; line-height: 1.4; }
body { -moz-osx-font-smoothing: grayscale; -webkit-font-smoothing: antialiased; tab-size: 4; }
h1, h2, h3, #toctitle, .sidebarblock > .content > .title, h4, h5, h6 { line-height: 1.4; }
a:hover, a:focus { text-decoration: underline; }
.clearfix:before, .clearfix:after, .float-group:before, .float-group:after { content: " "; display: table; }
.clearfix:after, .float-group:after { clear: both; }
*:not(pre) > code { font-size: inherit; font-style: normal !important; letter-spacing: 0; padding: 0; background-color: white; -webkit-border-radius: 0; border-radius: 0; line-height: inherit; word-wrap: break-word; }
*:not(pre) > code.nobreak { word-wrap: normal; }
*:not(pre) > code.nowrap { white-space: nowrap; }
pre, pre > code { line-height: 1.6; color: #264357; font-family: Consolas, "Liberation Mono", Courier, monospace; font-weight: normal; }
em em { font-style: normal; }
strong strong { font-weight: normal; }
.keyseq { color: #333333; }
kbd { font-family: Consolas, "Liberation Mono", Courier, monospace; display: inline-block; color: black; font-size: 0.65em; line-height: 1.45; background-color: #f7f7f7; border: 1px solid #ccc; -webkit-border-radius: 3px; border-radius: 3px; -webkit-box-shadow: 0 1px 0 rgba(0, 0, 0, 0.2), 0 0 0 0.1em white inset; box-shadow: 0 1px 0 rgba(0, 0, 0, 0.2), 0 0 0 0.1em white inset; margin: 0 0.15em; padding: 0.2em 0.5em; vertical-align: middle; position: relative; top: -0.1em; white-space: nowrap; }
.keyseq kbd:first-child { margin-left: 0; }
.keyseq kbd:last-child { margin-right: 0; }
.menuseq, .menuref { color: #000; }
.menuseq b:not(.caret), .menuref { font-weight: inherit; }
.menuseq { word-spacing: -0.02em; }
.menuseq b.caret { font-size: 1.25em; line-height: 0.8; }
.menuseq i.caret { font-weight: bold; text-align: center; width: 0.45em; }
b.button:before, b.button:after { position: relative; top: -1px; font-weight: normal; }
b.button:before { content: "["; padding: 0 3px 0 2px; }
b.button:after { content: "]"; padding: 0 2px 0 3px; }
#header, #content, #footnotes, #footer { width: 100%; margin-left: auto; margin-right: auto; margin-top: 0; margin-bottom: 0; max-width: 62.5em; *zoom: 1; position: relative; padding-left: 1.5em; padding-right: 1.5em; }
#header:before, #header:after, #content:before, #content:after, #footnotes:before, #footnotes:after, #footer:before, #footer:after { content: " "; display: table; }
#header:after, #content:after, #footnotes:after, #footer:after { clear: both; }
#content { margin-top: 1.25em; }
#content:before { content: none; }
#header > h1:first-child { color: black; margin-top: 2.25rem; margin-bottom: 0; }
#header > h1:first-child + #toc { margin-top: 8px; border-top: 1px solid #dddddd; }
#header > h1:only-child, body.toc2 #header > h1:nth-last-child(2) { border-bottom: 1px solid #dddddd; padding-bottom: 8px; }
#header .details { border-bottom: 1px solid #dddddd; line-height: 1.45; padding-top: 0.25em; padding-bottom: 0.25em; padding-left: 0.25em; color: #5e93b8; display: -ms-flexbox; display: -webkit-flex; display: flex; -ms-flex-flow: row wrap; -webkit-flex-flow: row wrap; flex-flow: row wrap; }
#header .details span:first-child { margin-left: -0.125em; }
#header .details span.email a { color: #333333; }
#header .details br { display: none; }
#header .details br + span:before { content: "\00a0\2013\00a0"; }
#header .details br + span.author:before { content: "\00a0\22c5\00a0"; color: #333333; }
#header .details br + span#revremark:before { content: "\00a0|\00a0"; }
#header #revnumber { text-transform: capitalize; }
#header #revnumber:after { content: "\00a0"; }
#content > h1:first-child:not([class]) { color: black; border-bottom: 1px solid #dddddd; padding-bottom: 8px; margin-top: 0; padding-top: 1rem; margin-bottom: 1.25rem; }
#toc { border-bottom: 0 solid #dddddd; padding-bottom: 0.5em; }
#toc > ul { margin-left: 0.125em; }
#toc ul.sectlevel0 > li > a { font-style: italic; }
#toc ul.sectlevel0 ul.sectlevel1 { margin: 0.5em 0; }
#toc ul { font-family: Noto, sans-serif; list-style-type: none; }
#toc li { line-height: 1.3334; margin-top: 0.3334em; }
#toc a { text-decoration: none; }
#toc a:active { text-decoration: underline; }
#toctitle { color: black; font-size: 1.2em; }
@media only screen and (min-width: 768px) { #toctitle { font-size: 1.375em; }
body.toc2 { padding-left: 15em; padding-right: 0; }
#toc.toc2 { margin-top: 0 !important; background-color: white; position: fixed; width: 15em; left: 0; top: 0; border-right: 1px solid #dddddd; border-top-width: 0 !important; border-bottom-width: 0 !important; z-index: 1000; padding: 1.25em 1em; height: 100%; overflow: auto; }
#toc.toc2 #toctitle { margin-top: 0; margin-bottom: 0.8rem; font-size: 1.2em; }
#toc.toc2 > ul { font-size: 0.9em; margin-bottom: 0; }
#toc.toc2 ul ul { margin-left: 0; padding-left: 1em; }
#toc.toc2 ul.sectlevel0 ul.sectlevel1 { padding-left: 0; margin-top: 0.5em; margin-bottom: 0.5em; }
body.toc2.toc-right { padding-left: 0; padding-right: 15em; }
body.toc2.toc-right #toc.toc2 { border-right-width: 0; border-left: 1px solid #dddddd; left: auto; right: 0; } }
@media only screen and (min-width: 1280px) { body.toc2 { padding-left: 20em; padding-right: 0; }
#toc.toc2 { width: 20em; }
#toc.toc2 #toctitle { font-size: 1.375em; }
#toc.toc2 > ul { font-size: 0.95em; }
#toc.toc2 ul ul { padding-left: 1.25em; }
body.toc2.toc-right { padding-left: 0; padding-right: 20em; } }
#content #toc { border-style: solid; border-width: 1px; border-color: #e6e6e6; margin-bottom: 1.25em; padding: 1.25em; background: white; -webkit-border-radius: 0; border-radius: 0; }
#content #toc > :first-child { margin-top: 0; }
#content #toc > :last-child { margin-bottom: 0; }
#footer { max-width: 100%; background-color: none; padding: 1.25em; }
#footer-text { color: black; line-height: 1.44; }
#content { margin-bottom: 0.625em; }
.sect1 { padding-bottom: 0.625em; }
@media only screen and (min-width: 768px) { #content { margin-bottom: 1.25em; }
.sect1 { padding-bottom: 1.25em; } }
.sect1:last-child { padding-bottom: 0; }
.sect1 + .sect1 { border-top: 0 solid #dddddd; }
#content h1 > a.anchor, h2 > a.anchor, h3 > a.anchor, #toctitle > a.anchor, .sidebarblock > .content > .title > a.anchor, h4 > a.anchor, h5 > a.anchor, h6 > a.anchor { position: absolute; z-index: 1001; width: 1.5ex; margin-left: -1.5ex; display: block; text-decoration: none !important; visibility: hidden; text-align: center; font-weight: normal; }
#content h1 > a.anchor:before, h2 > a.anchor:before, h3 > a.anchor:before, #toctitle > a.anchor:before, .sidebarblock > .content > .title > a.anchor:before, h4 > a.anchor:before, h5 > a.anchor:before, h6 > a.anchor:before { content: "\00A7"; font-size: 0.85em; display: block; padding-top: 0.1em; }
#content h1:hover > a.anchor, #content h1 > a.anchor:hover, h2:hover > a.anchor, h2 > a.anchor:hover, h3:hover > a.anchor, #toctitle:hover > a.anchor, .sidebarblock > .content > .title:hover > a.anchor, h3 > a.anchor:hover, #toctitle > a.anchor:hover, .sidebarblock > .content > .title > a.anchor:hover, h4:hover > a.anchor, h4 > a.anchor:hover, h5:hover > a.anchor, h5 > a.anchor:hover, h6:hover > a.anchor, h6 > a.anchor:hover { visibility: visible; }
#content h1 > a.link, h2 > a.link, h3 > a.link, #toctitle > a.link, .sidebarblock > .content > .title > a.link, h4 > a.link, h5 > a.link, h6 > a.link { color: black; text-decoration: none; }
#content h1 > a.link:hover, h2 > a.link:hover, h3 > a.link:hover, #toctitle > a.link:hover, .sidebarblock > .content > .title > a.link:hover, h4 > a.link:hover, h5 > a.link:hover, h6 > a.link:hover { color: black; }
.audioblock, .imageblock, .literalblock, .listingblock, .stemblock, .videoblock { margin-bottom: 1.25em; }
.admonitionblock td.content > .title, .audioblock > .title, .exampleblock > .title, .imageblock > .title, .listingblock > .title, .literalblock > .title, .stemblock > .title, .openblock > .title, .paragraph > .title, .quoteblock > .title, table.tableblock > .title, .verseblock > .title, .videoblock > .title, .dlist > .title, .olist > .title, .ulist > .title, .qlist > .title, .hdlist > .title { text-rendering: optimizeLegibility; text-align: left; }
table.tableblock > caption.title { white-space: nowrap; overflow: visible; max-width: 0; }
.paragraph.lead > p, #preamble > .sectionbody > .paragraph:first-of-type p { color: black; }
table.tableblock #preamble > .sectionbody > .paragraph:first-of-type p { font-size: inherit; }
.admonitionblock > table { border-collapse: separate; border: 0; background: none; width: 100%; }
.admonitionblock > table td.icon { text-align: center; width: 80px; }
.admonitionblock > table td.icon img { max-width: initial; }
.admonitionblock > table td.icon .title { font-weight: bold; font-family: Noto, sans-serif; text-transform: uppercase; }
.admonitionblock > table td.content { padding-left: 1.125em; padding-right: 1.25em; border-left: 1px solid #dddddd; color: #5e93b8; }
.admonitionblock > table td.content > :last-child > :last-child { margin-bottom: 0; }
.exampleblock > .content { border-style: solid; border-width: 1px; border-color: #e6e6e6; margin-bottom: 1.25em; padding: 1.25em; background: white; -webkit-border-radius: 0; border-radius: 0; }
.exampleblock > .content > :first-child { margin-top: 0; }
.exampleblock > .content > :last-child { margin-bottom: 0; }
.sidebarblock { border-style: solid; border-width: 1px; border-color: #e6e6e6; margin-bottom: 1.25em; padding: 1.25em; background: white; -webkit-border-radius: 0; border-radius: 0; }
.sidebarblock > :first-child { margin-top: 0; }
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<body class="manpage">
<div id="header">
<h1>cl_image_desc(3) Manual Page</h1>
<h2 id="_name">Name</h2>
<div class="sectionbody">
<p>cl_image_desc - The image descriptor structure describes the type and dimensions of the image or image array and is defined as:</p>
</div>
</div>
<div id="content">
<div class="sect1">
<h2 id="_c_specification">C Specification</h2>
<div class="sectionbody">
<div class="paragraph">
<p>The <strong>cl_image_desc</strong> image descriptor structure describes the type and
dimensions of an image or image array, and is defined as:</p>
</div>
<div id="cl_image_desc" class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-c++" data-lang="c++">typedef struct cl_image_desc {
cl_mem_object_type image_type;
size_t image_width;
size_t image_height;
size_t image_depth;
size_t image_array_size;
size_t image_row_pitch;
size_t image_slice_pitch;
cl_uint num_mip_levels;
cl_uint num_samples;
#ifdef __GNUC__
__extension__ /* Prevents warnings about anonymous union in -pedantic builds */
#endif
union {
cl_mem buffer;
cl_mem mem_object;
};
} cl_image_desc;</code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_members">Members</h2>
<div class="sectionbody">
<div class="ulist">
<ul>
<li>
<p><code>image_type</code> describes the image type and must be either
<code>CL_&#8203;MEM_&#8203;OBJECT_&#8203;IMAGE1D</code>, <code>CL_&#8203;MEM_&#8203;OBJECT_&#8203;IMAGE1D_&#8203;BUFFER</code>,
<code>CL_&#8203;MEM_&#8203;OBJECT_&#8203;IMAGE1D_&#8203;ARRAY</code>, <code>CL_&#8203;MEM_&#8203;OBJECT_&#8203;IMAGE2D</code>,
<code>CL_&#8203;MEM_&#8203;OBJECT_&#8203;IMAGE2D_&#8203;ARRAY</code>, or <code>CL_&#8203;MEM_&#8203;OBJECT_&#8203;IMAGE3D</code>.</p>
</li>
<li>
<p><code>image_width</code> is the width of the image in pixels.
For a 2D image and image array, the image width must be a value ≥ 1 and
<code>CL_&#8203;DEVICE_&#8203;IMAGE2D_&#8203;MAX_&#8203;WIDTH</code>.
For a 3D image, the image width must be a value ≥1 and ≤
<code>CL_&#8203;DEVICE_&#8203;IMAGE3D_&#8203;MAX_&#8203;WIDTH</code>.
For a 1D image buffer, the image width must be a value ≥1 and ≤
<code>CL_&#8203;DEVICE_&#8203;IMAGE_&#8203;MAX_&#8203;BUFFER_&#8203;SIZE</code>.
For a 1D image and 1D image array, the image width must be a value ≥1
and ≤ <code>CL_&#8203;DEVICE_&#8203;IMAGE2D_&#8203;MAX_&#8203;WIDTH</code>.</p>
</li>
<li>
<p><code>image_height</code> is the height of the image in pixels.
This is only used if the image is a 2D or 3D image, or a 2D image array.
For a 2D image or image array, the image height must be a value ≥ 1 and
<code>CL_&#8203;DEVICE_&#8203;IMAGE2D_&#8203;MAX_&#8203;HEIGHT</code>.
For a 3D image, the image height must be a value ≥ 1 and ≤
<code>CL_&#8203;DEVICE_&#8203;IMAGE3D_&#8203;MAX_&#8203;HEIGHT</code>.</p>
</li>
<li>
<p><code>image_depth</code> is the depth of the image in pixels.
This is only used if the image is a 3D image and must be a value ≥ 1 and
<code>CL_&#8203;DEVICE_&#8203;IMAGE3D_&#8203;MAX_&#8203;DEPTH</code>.</p>
</li>
<li>
<p><code>image_array_size</code><sup>5</sup> is the number of images in the image array.
This is only used if the image is a 1D or 2D image array.
The values for <code>image_array_size</code>, if specified, must be a value ≥ 1 and
<code>CL_&#8203;DEVICE_&#8203;IMAGE_&#8203;MAX_&#8203;ARRAY_&#8203;SIZE</code>.</p>
<div class="dlist">
<dl>
<dt class="hdlist1">5</dt>
<dd>
<p>Note that reading and writing 2D image arrays from a kernel with
<code>image_array_size</code>=1 may be lower performance than 2D images.</p>
</dd>
</dl>
</div>
</li>
<li>
<p><code>image_row_pitch</code> is the scan-line pitch in bytes.
This must be 0 if <em>host_ptr</em> is <code>NULL</code> and can be either 0 or ≥
<code>image_width</code> × size of element in bytes if <em>host_ptr</em> is not <code>NULL</code>.
If <em>host_ptr</em> is not <code>NULL</code> and <code>image_row_pitch</code> = 0, <code>image_row_pitch</code> is
calculated as <code>image_width</code> × size of element in bytes.
If <code>image_row_pitch</code> is not 0, it must be a multiple of the image element
size in bytes.
For a 2D image created from a buffer, the pitch specified (or computed if
pitch specified is 0) must be a multiple of the maximum of the
<code>CL_&#8203;DEVICE_&#8203;IMAGE_&#8203;PITCH_&#8203;ALIGNMENT</code> value for all devices in the context
associated with the buffer specified by <code>mem_object</code> that support images.</p>
</li>
<li>
<p><code>image_slice_pitch</code> is the size in bytes of each 2D slice in the 3D image or
the size in bytes of each image in a 1D or 2D image array.
This must be 0 if <em>host_ptr</em> is <code>NULL</code>.
If <em>host_ptr</em> is not <code>NULL</code>, <code>image_slice_pitch</code> can be either 0 or ≥
<code>image_row_pitch</code> × <code>image_height</code> for a 2D image array or 3D image
and can be either 0 or ≥ <code>image_row_pitch</code> for a 1D image array.
If <em>host_ptr</em> is not <code>NULL</code> and <code>image_slice_pitch</code> = 0, <code>image_slice_pitch</code>
is calculated as <code>image_row_pitch</code> × <code>image_height</code> for a 2D image
array or 3D image and <code>image_row_pitch</code> for a 1D image array.
If <code>image_slice_pitch</code> is not 0, it must be a multiple of the
<code>image_row_pitch</code>.</p>
</li>
<li>
<p><code>num_mip_levels</code> and <code>num_samples</code> must be 0.</p>
</li>
<li>
<p><code>mem_object</code> may refer to a valid buffer or image memory object.
<code>mem_object</code> can be a buffer memory object if <code>image_type</code> is
<code>CL_&#8203;MEM_&#8203;OBJECT_&#8203;IMAGE1D_&#8203;BUFFER</code> or <code>CL_&#8203;MEM_&#8203;OBJECT_&#8203;IMAGE2D</code><sup>6</sup>.
<code>mem_object</code> can be an image object if <code>image_type</code> is
<code>CL_&#8203;MEM_&#8203;OBJECT_&#8203;IMAGE2D</code><sup>7</sup>.
Otherwise it must be <code>NULL</code>.
The image pixels are taken from the memory objects data store.
When the contents of the specified memory objects data store are modified,
those changes are reflected in the contents of the image object and
vice-versa at corresponding synchronization points.</p>
</li>
</ul>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_description">Description</h2>
<div class="sectionbody">
<div class="dlist">
<dl>
<dt class="hdlist1">6</dt>
<dd>
<p>To create a 2D image from a buffer object that share the data store
between the image and buffer object.</p>
</dd>
<dt class="hdlist1">7</dt>
<dd>
<p>To create an image object from another image object that share the data
store between these image objects.</p>
</dd>
</dl>
</div>
<div class="paragraph">
<p>For a 1D image buffer created from a buffer object, the <code>image_width</code> ×
size of element in bytes must be ≤ size of the buffer object.
The image data in the buffer object is stored as a single scanline which is
a linear sequence of adjacent elements.</p>
</div>
<div class="paragraph">
<p>For a 2D image created from a buffer object, the <code>image_row_pitch</code> ×
<code>image_height</code> must be ≤ size of the buffer object specified by
<code>mem_object</code>.
The image data in the buffer object is stored as a linear sequence of
adjacent scanlines.
Each scanline is a linear sequence of image elements padded to
<code>image_row_pitch</code> bytes.</p>
</div>
<div class="paragraph">
<p>For an image object created from another image object, the values specified
in the image descriptor except for <code>mem_object</code> must match the image
descriptor information associated with <code>mem_object</code>.</p>
</div>
<div class="paragraph">
<p>Image elements are stored according to their image format as described in
<a href="https://www.khronos.org/registry/OpenCL/specs/2.2/html/OpenCL_API.html#image-format-descriptor" target="_blank" rel="noopener">Image Format Descriptor</a>.</p>
</div>
<div class="paragraph">
<p>If the buffer object specified by <code>mem_object</code> was created with
<code>CL_&#8203;MEM_&#8203;USE_&#8203;HOST_&#8203;PTR</code>, the <em>host_ptr</em> specified to <strong>clCreateBuffer</strong> must be
aligned to the maximum of the <code>CL_&#8203;DEVICE_&#8203;IMAGE_&#8203;BASE_&#8203;ADDRESS_&#8203;ALIGNMENT</code> value
for all devices in the context associated with the buffer specified by
<code>mem_object</code> that support images.</p>
</div>
<div class="paragraph">
<p>Creating a 2D image object from another 2D image object allows users to
create a new image object that shares the image data store with <code>mem_object</code>
but views the pixels in the image with a different channel order.
The restrictions are:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>all the values specified in <code>image_desc</code> except for <code>mem_object</code> must match
the image descriptor information associated with <code>mem_object</code>.</p>
</li>
<li>
<p>The <code>image_desc</code> used for creation of <code>mem_object</code> may not be
equivalent to image descriptor information associated with <code>mem_object</code>.
To ensure the values in <em>`image_desc</em> will match one can query
<code>mem_object</code> for associated information using <strong>clGetImageInfo</strong> function
described in <a href="https://www.khronos.org/registry/OpenCL/specs/2.2/html/OpenCL_API.html#image-object-queries" target="_blank" rel="noopener">Image Object Queries</a>.</p>
</li>
<li>
<p>the channel data type specified in <code>image_format</code> must match the channel
data type associated with <code>mem_object</code>.
The channel order values<sup>8</sup> supported are:</p>
</li>
</ul>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_see_also">See Also</h2>
<div class="sectionbody">
<div class="paragraph">
<p><a href="clCreateImage.html">clCreateImage</a>, <a href="cl_mem_object_type.html">cl_mem_object_type</a>, <a href="cl_uint.html">cl_uint</a></p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_document_notes">Document Notes</h2>
<div class="sectionbody">
<div class="paragraph">
<p>For more information, see the <a href="https://www.khronos.org/registry/OpenCL/specs/2.2/html/OpenCL_API.html#cl_image_desc" target="_blank" rel="noopener">OpenCL Specification</a></p>
</div>
<div class="paragraph">
<p>This page is extracted from the OpenCL Specification.
Fixes and changes should be made to the Specification, not directly.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_copyright">Copyright</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Copyright (c) 2014-2019 Khronos Group. This work is licensed under a
<a href="http://creativecommons.org/licenses/by/4.0/" target="_blank" rel="noopener">Creative Commons
Attribution 4.0 International License</a>.</p>
</div>
</div>
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