102f4aeb0Sopenharmony_ci<?xml version="1.0" encoding="UTF-8" standalone="no"?> 202f4aeb0Sopenharmony_ci<!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml"> 302f4aeb0Sopenharmony_ci <head> 402f4aeb0Sopenharmony_ci <title xmlns:xlink="http://www.w3.org/1999/xlink">eglQuerySurface - EGL Reference Pages</title> 502f4aeb0Sopenharmony_ci <link rel="stylesheet" type="text/css" href="khronos-man.css"/> 602f4aeb0Sopenharmony_ci <meta name="generator" content="DocBook XSL Stylesheets V1.79.1"/> 702f4aeb0Sopenharmony_ci </head> 802f4aeb0Sopenharmony_ci <body> 902f4aeb0Sopenharmony_ci <header/> 1002f4aeb0Sopenharmony_ci <div class="refentry" id="eglQuerySurface"> 1102f4aeb0Sopenharmony_ci <div class="titlepage"/> 1202f4aeb0Sopenharmony_ci <div class="refnamediv"> 1302f4aeb0Sopenharmony_ci <h2>Name</h2> 1402f4aeb0Sopenharmony_ci <p>eglQuerySurface — 1502f4aeb0Sopenharmony_ci return <abbr class="acronym">EGL</abbr> surface information 1602f4aeb0Sopenharmony_ci </p> 1702f4aeb0Sopenharmony_ci </div> 1802f4aeb0Sopenharmony_ci <div class="refsynopsisdiv"> 1902f4aeb0Sopenharmony_ci <h2>C Specification</h2> 2002f4aeb0Sopenharmony_ci <div class="funcsynopsis"> 2102f4aeb0Sopenharmony_ci <table style="border: 0; cellspacing: 0; cellpadding: 0;" class="funcprototype-table"> 2202f4aeb0Sopenharmony_ci <tr> 2302f4aeb0Sopenharmony_ci <td> 2402f4aeb0Sopenharmony_ci <code class="funcdef">EGLBoolean <strong class="fsfunc">eglQuerySurface</strong>(</code> 2502f4aeb0Sopenharmony_ci </td> 2602f4aeb0Sopenharmony_ci <td>EGLDisplay <var class="pdparam">display</var>, </td> 2702f4aeb0Sopenharmony_ci </tr> 2802f4aeb0Sopenharmony_ci <tr> 2902f4aeb0Sopenharmony_ci <td> </td> 3002f4aeb0Sopenharmony_ci <td>EGLSurface <var class="pdparam">surface</var>, </td> 3102f4aeb0Sopenharmony_ci </tr> 3202f4aeb0Sopenharmony_ci <tr> 3302f4aeb0Sopenharmony_ci <td> </td> 3402f4aeb0Sopenharmony_ci <td>EGLint <var class="pdparam">attribute</var>, </td> 3502f4aeb0Sopenharmony_ci </tr> 3602f4aeb0Sopenharmony_ci <tr> 3702f4aeb0Sopenharmony_ci <td> </td> 3802f4aeb0Sopenharmony_ci <td>EGLint * <var class="pdparam">value</var><code>)</code>;</td> 3902f4aeb0Sopenharmony_ci </tr> 4002f4aeb0Sopenharmony_ci </table> 4102f4aeb0Sopenharmony_ci <div class="funcprototype-spacer"> </div> 4202f4aeb0Sopenharmony_ci </div> 4302f4aeb0Sopenharmony_ci </div> 4402f4aeb0Sopenharmony_ci <div class="refsect1" id="parameters"> 4502f4aeb0Sopenharmony_ci <h2>Parameters</h2> 4602f4aeb0Sopenharmony_ci <div class="variablelist"> 4702f4aeb0Sopenharmony_ci <dl class="variablelist"> 4802f4aeb0Sopenharmony_ci <dt> 4902f4aeb0Sopenharmony_ci <span class="term"> 5002f4aeb0Sopenharmony_ci <em class="parameter"> 5102f4aeb0Sopenharmony_ci <code>display</code> 5202f4aeb0Sopenharmony_ci </em> 5302f4aeb0Sopenharmony_ci </span> 5402f4aeb0Sopenharmony_ci </dt> 5502f4aeb0Sopenharmony_ci <dd> 5602f4aeb0Sopenharmony_ci <p> 5702f4aeb0Sopenharmony_ci Specifies the EGL display connection. 5802f4aeb0Sopenharmony_ci </p> 5902f4aeb0Sopenharmony_ci </dd> 6002f4aeb0Sopenharmony_ci <dt> 6102f4aeb0Sopenharmony_ci <span class="term"> 6202f4aeb0Sopenharmony_ci <em class="parameter"> 6302f4aeb0Sopenharmony_ci <code>surface</code> 6402f4aeb0Sopenharmony_ci </em> 6502f4aeb0Sopenharmony_ci </span> 6602f4aeb0Sopenharmony_ci </dt> 6702f4aeb0Sopenharmony_ci <dd> 6802f4aeb0Sopenharmony_ci <p> 6902f4aeb0Sopenharmony_ci Specifies the EGL surface to query. 7002f4aeb0Sopenharmony_ci </p> 7102f4aeb0Sopenharmony_ci </dd> 7202f4aeb0Sopenharmony_ci <dt> 7302f4aeb0Sopenharmony_ci <span class="term"> 7402f4aeb0Sopenharmony_ci <em class="parameter"> 7502f4aeb0Sopenharmony_ci <code>attribute</code> 7602f4aeb0Sopenharmony_ci </em> 7702f4aeb0Sopenharmony_ci </span> 7802f4aeb0Sopenharmony_ci </dt> 7902f4aeb0Sopenharmony_ci <dd> 8002f4aeb0Sopenharmony_ci <p> 8102f4aeb0Sopenharmony_ci Specifies the EGL surface attribute to be returned. 8202f4aeb0Sopenharmony_ci </p> 8302f4aeb0Sopenharmony_ci </dd> 8402f4aeb0Sopenharmony_ci <dt> 8502f4aeb0Sopenharmony_ci <span class="term"> 8602f4aeb0Sopenharmony_ci <em class="parameter"> 8702f4aeb0Sopenharmony_ci <code>value</code> 8802f4aeb0Sopenharmony_ci </em> 8902f4aeb0Sopenharmony_ci </span> 9002f4aeb0Sopenharmony_ci </dt> 9102f4aeb0Sopenharmony_ci <dd> 9202f4aeb0Sopenharmony_ci <p> 9302f4aeb0Sopenharmony_ci Returns the requested value. 9402f4aeb0Sopenharmony_ci </p> 9502f4aeb0Sopenharmony_ci </dd> 9602f4aeb0Sopenharmony_ci </dl> 9702f4aeb0Sopenharmony_ci </div> 9802f4aeb0Sopenharmony_ci </div> 9902f4aeb0Sopenharmony_ci <div class="refsect1" id="description"> 10002f4aeb0Sopenharmony_ci <h2>Description</h2> 10102f4aeb0Sopenharmony_ci <p> 10202f4aeb0Sopenharmony_ci <code class="function">eglQuerySurface</code> returns in 10302f4aeb0Sopenharmony_ci <em class="parameter"><code>value</code></em> the value of 10402f4aeb0Sopenharmony_ci <em class="parameter"><code>attribute</code></em> for <em class="parameter"><code>surface</code></em>. 10502f4aeb0Sopenharmony_ci <em class="parameter"><code>attribute</code></em> can be one of the following: 10602f4aeb0Sopenharmony_ci </p> 10702f4aeb0Sopenharmony_ci <div class="variablelist"> 10802f4aeb0Sopenharmony_ci <dl class="variablelist"> 10902f4aeb0Sopenharmony_ci <dt> 11002f4aeb0Sopenharmony_ci <span class="term"> 11102f4aeb0Sopenharmony_ci <code class="constant">EGL_CONFIG_ID</code> 11202f4aeb0Sopenharmony_ci </span> 11302f4aeb0Sopenharmony_ci </dt> 11402f4aeb0Sopenharmony_ci <dd> 11502f4aeb0Sopenharmony_ci <p> 11602f4aeb0Sopenharmony_ci Returns the ID of the EGL frame buffer configuration 11702f4aeb0Sopenharmony_ci with respect to which the surface was created. 11802f4aeb0Sopenharmony_ci </p> 11902f4aeb0Sopenharmony_ci </dd> 12002f4aeb0Sopenharmony_ci <dt> 12102f4aeb0Sopenharmony_ci <span class="term"> 12202f4aeb0Sopenharmony_ci <code class="constant">EGL_GL_COLORSPACE</code> 12302f4aeb0Sopenharmony_ci </span> 12402f4aeb0Sopenharmony_ci </dt> 12502f4aeb0Sopenharmony_ci <dd> 12602f4aeb0Sopenharmony_ci <p> 12702f4aeb0Sopenharmony_ci Returns the color space used by OpenGL and OpenGL ES 12802f4aeb0Sopenharmony_ci when rendering to the surface, either 12902f4aeb0Sopenharmony_ci <code class="constant">EGL_GL_COLORSPACE_SRGB</code> or 13002f4aeb0Sopenharmony_ci <code class="constant">EGL_GL_COLORSPACE_LINEAR</code>. 13102f4aeb0Sopenharmony_ci </p> 13202f4aeb0Sopenharmony_ci </dd> 13302f4aeb0Sopenharmony_ci <dt> 13402f4aeb0Sopenharmony_ci <span class="term"> 13502f4aeb0Sopenharmony_ci <code class="constant">EGL_HEIGHT</code> 13602f4aeb0Sopenharmony_ci </span> 13702f4aeb0Sopenharmony_ci </dt> 13802f4aeb0Sopenharmony_ci <dd> 13902f4aeb0Sopenharmony_ci <p> 14002f4aeb0Sopenharmony_ci Returns the height of the surface in pixels. 14102f4aeb0Sopenharmony_ci </p> 14202f4aeb0Sopenharmony_ci </dd> 14302f4aeb0Sopenharmony_ci <dt> 14402f4aeb0Sopenharmony_ci <span class="term"> 14502f4aeb0Sopenharmony_ci <code class="constant">EGL_HORIZONTAL_RESOLUTION</code> 14602f4aeb0Sopenharmony_ci </span> 14702f4aeb0Sopenharmony_ci </dt> 14802f4aeb0Sopenharmony_ci <dd> 14902f4aeb0Sopenharmony_ci <p> 15002f4aeb0Sopenharmony_ci Returns the horizontal dot pitch of the display on 15102f4aeb0Sopenharmony_ci which a window surface is visible. The value 15202f4aeb0Sopenharmony_ci returned is equal to the actual dot pitch, in 15302f4aeb0Sopenharmony_ci pixels/meter, multiplied by the constant value 15402f4aeb0Sopenharmony_ci <code class="constant">EGL_DISPLAY_SCALING</code>. 15502f4aeb0Sopenharmony_ci </p> 15602f4aeb0Sopenharmony_ci </dd> 15702f4aeb0Sopenharmony_ci <dt> 15802f4aeb0Sopenharmony_ci <span class="term"> 15902f4aeb0Sopenharmony_ci <code class="constant">EGL_LARGEST_PBUFFER</code> 16002f4aeb0Sopenharmony_ci </span> 16102f4aeb0Sopenharmony_ci </dt> 16202f4aeb0Sopenharmony_ci <dd> 16302f4aeb0Sopenharmony_ci <p> 16402f4aeb0Sopenharmony_ci Returns the same attribute value specified when the 16502f4aeb0Sopenharmony_ci surface was created with 16602f4aeb0Sopenharmony_ci <a class="citerefentry" href="eglCreatePbufferSurface.xhtml"><span class="citerefentry"><span class="refentrytitle">eglCreatePbufferSurface</span></span></a>. 16702f4aeb0Sopenharmony_ci For a window or pixmap surface, 16802f4aeb0Sopenharmony_ci <em class="parameter"><code>value</code></em> is not modified. 16902f4aeb0Sopenharmony_ci </p> 17002f4aeb0Sopenharmony_ci </dd> 17102f4aeb0Sopenharmony_ci <dt> 17202f4aeb0Sopenharmony_ci <span class="term"> 17302f4aeb0Sopenharmony_ci <code class="constant">EGL_MIPMAP_LEVEL</code> 17402f4aeb0Sopenharmony_ci </span> 17502f4aeb0Sopenharmony_ci </dt> 17602f4aeb0Sopenharmony_ci <dd> 17702f4aeb0Sopenharmony_ci <p> 17802f4aeb0Sopenharmony_ci Returns which level of the mipmap to render to, if 17902f4aeb0Sopenharmony_ci texture has mipmaps. 18002f4aeb0Sopenharmony_ci </p> 18102f4aeb0Sopenharmony_ci </dd> 18202f4aeb0Sopenharmony_ci <dt> 18302f4aeb0Sopenharmony_ci <span class="term"> 18402f4aeb0Sopenharmony_ci <code class="constant">EGL_MIPMAP_TEXTURE</code> 18502f4aeb0Sopenharmony_ci </span> 18602f4aeb0Sopenharmony_ci </dt> 18702f4aeb0Sopenharmony_ci <dd> 18802f4aeb0Sopenharmony_ci <p> 18902f4aeb0Sopenharmony_ci Returns <code class="constant">EGL_TRUE</code> if texture has 19002f4aeb0Sopenharmony_ci mipmaps, <code class="constant">EGL_FALSE</code> otherwise. 19102f4aeb0Sopenharmony_ci </p> 19202f4aeb0Sopenharmony_ci </dd> 19302f4aeb0Sopenharmony_ci <dt> 19402f4aeb0Sopenharmony_ci <span class="term"> 19502f4aeb0Sopenharmony_ci <code class="constant">EGL_MULTISAMPLE_RESOLVE</code> 19602f4aeb0Sopenharmony_ci </span> 19702f4aeb0Sopenharmony_ci </dt> 19802f4aeb0Sopenharmony_ci <dd> 19902f4aeb0Sopenharmony_ci <p> 20002f4aeb0Sopenharmony_ci Returns the filter used when resolving the 20102f4aeb0Sopenharmony_ci multisample buffer. The filter may be either 20202f4aeb0Sopenharmony_ci <code class="constant">EGL_MULTISAMPLE_RESOLVE_DEFAULT</code> 20302f4aeb0Sopenharmony_ci or <code class="constant">EGL_MULTISAMPLE_RESOLVE_BOX</code>, 20402f4aeb0Sopenharmony_ci as described for 20502f4aeb0Sopenharmony_ci <a class="citerefentry" href="eglSurfaceAttrib.xhtml"><span class="citerefentry"><span class="refentrytitle">eglSurfaceAttrib</span></span></a>. 20602f4aeb0Sopenharmony_ci </p> 20702f4aeb0Sopenharmony_ci </dd> 20802f4aeb0Sopenharmony_ci <dt> 20902f4aeb0Sopenharmony_ci <span class="term"> 21002f4aeb0Sopenharmony_ci <code class="constant">EGL_PIXEL_ASPECT_RATIO</code> 21102f4aeb0Sopenharmony_ci </span> 21202f4aeb0Sopenharmony_ci </dt> 21302f4aeb0Sopenharmony_ci <dd> 21402f4aeb0Sopenharmony_ci <p> 21502f4aeb0Sopenharmony_ci Returns the aspect ratio of an individual pixel (the 21602f4aeb0Sopenharmony_ci ratio of a pixel's width to its height). The value 21702f4aeb0Sopenharmony_ci returned is equal to the actual aspect ratio 21802f4aeb0Sopenharmony_ci multiplied by the constant value 21902f4aeb0Sopenharmony_ci <code class="constant">EGL_DISPLAY_SCALING</code>. 22002f4aeb0Sopenharmony_ci </p> 22102f4aeb0Sopenharmony_ci </dd> 22202f4aeb0Sopenharmony_ci <dt> 22302f4aeb0Sopenharmony_ci <span class="term"> 22402f4aeb0Sopenharmony_ci <code class="constant">EGL_RENDER_BUFFER</code> 22502f4aeb0Sopenharmony_ci </span> 22602f4aeb0Sopenharmony_ci </dt> 22702f4aeb0Sopenharmony_ci <dd> 22802f4aeb0Sopenharmony_ci <p> 22902f4aeb0Sopenharmony_ci Returns the buffer which client API rendering is 23002f4aeb0Sopenharmony_ci requested to use. For a window surface, this is the 23102f4aeb0Sopenharmony_ci same attribute value specified when the surface was 23202f4aeb0Sopenharmony_ci created. For a pbuffer surface, it is always 23302f4aeb0Sopenharmony_ci <code class="constant">EGL_BACK_BUFFER</code>. For a pixmap 23402f4aeb0Sopenharmony_ci surface, it is always 23502f4aeb0Sopenharmony_ci <code class="constant">EGL_SINGLE_BUFFER</code>. To determine 23602f4aeb0Sopenharmony_ci the actual buffer being rendered to by a context, 23702f4aeb0Sopenharmony_ci call 23802f4aeb0Sopenharmony_ci <a class="citerefentry" href="eglQueryContext.xhtml"><span class="citerefentry"><span class="refentrytitle">eglQueryContext</span></span></a>. 23902f4aeb0Sopenharmony_ci </p> 24002f4aeb0Sopenharmony_ci </dd> 24102f4aeb0Sopenharmony_ci <dt> 24202f4aeb0Sopenharmony_ci <span class="term"> 24302f4aeb0Sopenharmony_ci <code class="constant">EGL_SWAP_BEHAVIOR</code> 24402f4aeb0Sopenharmony_ci </span> 24502f4aeb0Sopenharmony_ci </dt> 24602f4aeb0Sopenharmony_ci <dd> 24702f4aeb0Sopenharmony_ci <p> 24802f4aeb0Sopenharmony_ci Returns the effect on the color buffer when posting 24902f4aeb0Sopenharmony_ci a surface with 25002f4aeb0Sopenharmony_ci <a class="citerefentry" href="eglSwapBuffers.xhtml"><span class="citerefentry"><span class="refentrytitle">eglSwapBuffers</span></span></a>. 25102f4aeb0Sopenharmony_ci Swap behavior may be either 25202f4aeb0Sopenharmony_ci <code class="constant">EGL_BUFFER_PRESERVED</code> or 25302f4aeb0Sopenharmony_ci <code class="constant">EGL_BUFFER_DESTROYED</code>, as 25402f4aeb0Sopenharmony_ci described for 25502f4aeb0Sopenharmony_ci <a class="citerefentry" href="eglSurfaceAttrib.xhtml"><span class="citerefentry"><span class="refentrytitle">eglSurfaceAttrib</span></span></a>. 25602f4aeb0Sopenharmony_ci </p> 25702f4aeb0Sopenharmony_ci </dd> 25802f4aeb0Sopenharmony_ci <dt> 25902f4aeb0Sopenharmony_ci <span class="term"> 26002f4aeb0Sopenharmony_ci <code class="constant">EGL_TEXTURE_FORMAT</code> 26102f4aeb0Sopenharmony_ci </span> 26202f4aeb0Sopenharmony_ci </dt> 26302f4aeb0Sopenharmony_ci <dd> 26402f4aeb0Sopenharmony_ci <p> 26502f4aeb0Sopenharmony_ci Returns format of texture. Possible values are 26602f4aeb0Sopenharmony_ci <code class="constant">EGL_NO_TEXTURE</code>, 26702f4aeb0Sopenharmony_ci <code class="constant">EGL_TEXTURE_RGB</code>, and 26802f4aeb0Sopenharmony_ci <code class="constant">EGL_TEXTURE_RGBA</code>. 26902f4aeb0Sopenharmony_ci </p> 27002f4aeb0Sopenharmony_ci </dd> 27102f4aeb0Sopenharmony_ci <dt> 27202f4aeb0Sopenharmony_ci <span class="term"> 27302f4aeb0Sopenharmony_ci <code class="constant">EGL_TEXTURE_TARGET</code> 27402f4aeb0Sopenharmony_ci </span> 27502f4aeb0Sopenharmony_ci </dt> 27602f4aeb0Sopenharmony_ci <dd> 27702f4aeb0Sopenharmony_ci <p> 27802f4aeb0Sopenharmony_ci Returns type of texture. Possible values are 27902f4aeb0Sopenharmony_ci <code class="constant">EGL_NO_TEXTURE</code>, or 28002f4aeb0Sopenharmony_ci <code class="constant">EGL_TEXTURE_2D</code>. 28102f4aeb0Sopenharmony_ci </p> 28202f4aeb0Sopenharmony_ci </dd> 28302f4aeb0Sopenharmony_ci <dt> 28402f4aeb0Sopenharmony_ci <span class="term"> 28502f4aeb0Sopenharmony_ci <code class="constant">EGL_VERTICAL_RESOLUTION</code> 28602f4aeb0Sopenharmony_ci </span> 28702f4aeb0Sopenharmony_ci </dt> 28802f4aeb0Sopenharmony_ci <dd> 28902f4aeb0Sopenharmony_ci <p> 29002f4aeb0Sopenharmony_ci Returns the vertical dot pitch of the display on 29102f4aeb0Sopenharmony_ci which a window surface is visible. The value 29202f4aeb0Sopenharmony_ci returned is equal to the actual dot pitch, in 29302f4aeb0Sopenharmony_ci pixels/meter, multiplied by the constant value 29402f4aeb0Sopenharmony_ci <code class="constant">EGL_DISPLAY_SCALING</code>. 29502f4aeb0Sopenharmony_ci </p> 29602f4aeb0Sopenharmony_ci </dd> 29702f4aeb0Sopenharmony_ci <dt> 29802f4aeb0Sopenharmony_ci <span class="term"> 29902f4aeb0Sopenharmony_ci <code class="constant">EGL_VG_ALPHA_FORMAT</code> 30002f4aeb0Sopenharmony_ci </span> 30102f4aeb0Sopenharmony_ci </dt> 30202f4aeb0Sopenharmony_ci <dd> 30302f4aeb0Sopenharmony_ci <p> 30402f4aeb0Sopenharmony_ci Returns the interpretation of alpha values used by 30502f4aeb0Sopenharmony_ci OpenVG when rendering to the surface, either 30602f4aeb0Sopenharmony_ci <code class="constant">EGL_VG_ALPHA_FORMAT_NONPRE</code> or 30702f4aeb0Sopenharmony_ci <code class="constant">EGL_VG_ALPHA_FORMAT_PRE</code>. 30802f4aeb0Sopenharmony_ci </p> 30902f4aeb0Sopenharmony_ci </dd> 31002f4aeb0Sopenharmony_ci <dt> 31102f4aeb0Sopenharmony_ci <span class="term"> 31202f4aeb0Sopenharmony_ci <code class="constant">EGL_VG_COLORSPACE</code> 31302f4aeb0Sopenharmony_ci </span> 31402f4aeb0Sopenharmony_ci </dt> 31502f4aeb0Sopenharmony_ci <dd> 31602f4aeb0Sopenharmony_ci <p> 31702f4aeb0Sopenharmony_ci Returns the color space used by OpenVG when rendering to 31802f4aeb0Sopenharmony_ci the surface, either 31902f4aeb0Sopenharmony_ci <code class="constant">EGL_VG_COLORSPACE_sRGB</code> or 32002f4aeb0Sopenharmony_ci <code class="constant">EGL_VG_COLORSPACE_LINEAR</code>. 32102f4aeb0Sopenharmony_ci </p> 32202f4aeb0Sopenharmony_ci </dd> 32302f4aeb0Sopenharmony_ci <dt> 32402f4aeb0Sopenharmony_ci <span class="term"> 32502f4aeb0Sopenharmony_ci <code class="constant">EGL_WIDTH</code> 32602f4aeb0Sopenharmony_ci </span> 32702f4aeb0Sopenharmony_ci </dt> 32802f4aeb0Sopenharmony_ci <dd> 32902f4aeb0Sopenharmony_ci <p> 33002f4aeb0Sopenharmony_ci Returns the width of the surface in pixels. 33102f4aeb0Sopenharmony_ci </p> 33202f4aeb0Sopenharmony_ci </dd> 33302f4aeb0Sopenharmony_ci </dl> 33402f4aeb0Sopenharmony_ci </div> 33502f4aeb0Sopenharmony_ci </div> 33602f4aeb0Sopenharmony_ci <div class="refsect1" id="notes"> 33702f4aeb0Sopenharmony_ci <h2>Notes</h2> 33802f4aeb0Sopenharmony_ci <p> 33902f4aeb0Sopenharmony_ci Attribute <code class="constant">EGL_GL_COLORSPACE</code> is supported 34002f4aeb0Sopenharmony_ci only if the EGL version is 1.5 or greater. 34102f4aeb0Sopenharmony_ci </p> 34202f4aeb0Sopenharmony_ci <p> 34302f4aeb0Sopenharmony_ci Attribute <code class="constant">EGL_MULTISAMPLE_RESOLVE</code> is 34402f4aeb0Sopenharmony_ci supported only if the EGL version is 1.4 or greater. 34502f4aeb0Sopenharmony_ci </p> 34602f4aeb0Sopenharmony_ci <p> 34702f4aeb0Sopenharmony_ci Attributes <code class="constant">EGL_DISPLAY_SCALING</code>. 34802f4aeb0Sopenharmony_ci <code class="constant">EGL_HORIZONTAL_RESOLUTION</code>, 34902f4aeb0Sopenharmony_ci <code class="constant">EGL_PIXEL_ASPECT_RATIO</code>, 35002f4aeb0Sopenharmony_ci <code class="constant">EGL_RENDER_BUFFER</code>, 35102f4aeb0Sopenharmony_ci <code class="constant">EGL_SWAP_BEHAVIOR</code>, and 35202f4aeb0Sopenharmony_ci <code class="constant">EGL_VERTICAL_RESOLUTION</code> are supported 35302f4aeb0Sopenharmony_ci only if the EGL version is 1.2 or greater. 35402f4aeb0Sopenharmony_ci </p> 35502f4aeb0Sopenharmony_ci <p> 35602f4aeb0Sopenharmony_ci Querying attributes <code class="constant">EGL_TEXTURE_FORMAT</code>, 35702f4aeb0Sopenharmony_ci <code class="constant">EGL_TEXTURE_TARGET</code>, 35802f4aeb0Sopenharmony_ci <code class="constant">EGL_MIPMAP_TEXTURE</code>, or 35902f4aeb0Sopenharmony_ci <code class="constant">EGL_MIPMAP_LEVEL</code> for a non-pbuffer 36002f4aeb0Sopenharmony_ci surface is not an error, but <em class="parameter"><code>value</code></em> is 36102f4aeb0Sopenharmony_ci not modified. 36202f4aeb0Sopenharmony_ci </p> 36302f4aeb0Sopenharmony_ci <p> 36402f4aeb0Sopenharmony_ci <code class="constant">EGL_DISPLAY_SCALING</code> is the constant 36502f4aeb0Sopenharmony_ci value 10000. Floating-point values such as resolution and 36602f4aeb0Sopenharmony_ci pixel aspect ratio are scaled by this value before being 36702f4aeb0Sopenharmony_ci returned as integers so that sufficient precision to be 36802f4aeb0Sopenharmony_ci meaningful will be retained in the returned value. 36902f4aeb0Sopenharmony_ci </p> 37002f4aeb0Sopenharmony_ci <p> 37102f4aeb0Sopenharmony_ci For an offscreen (pbuffer or pixmap) surface, or a surface 37202f4aeb0Sopenharmony_ci whose pixel dot pitch or aspect ratio are unknown, querying 37302f4aeb0Sopenharmony_ci <code class="constant">EGL_HORIZONTAL_RESOLUTION</code>, 37402f4aeb0Sopenharmony_ci <code class="constant">EGL_PIXEL_ASPECT_RATIO</code>, or 37502f4aeb0Sopenharmony_ci <code class="constant">EGL_VERTICAL_RESOLUTION</code> will return the 37602f4aeb0Sopenharmony_ci constant value <code class="constant">EGL_UNKNOWN</code> (-1). 37702f4aeb0Sopenharmony_ci </p> 37802f4aeb0Sopenharmony_ci </div> 37902f4aeb0Sopenharmony_ci <div class="refsect1" id="errors"> 38002f4aeb0Sopenharmony_ci <h2>Errors</h2> 38102f4aeb0Sopenharmony_ci <p> 38202f4aeb0Sopenharmony_ci <code class="constant">EGL_FALSE</code> is returned on failure, 38302f4aeb0Sopenharmony_ci <code class="constant">EGL_TRUE</code> otherwise. 38402f4aeb0Sopenharmony_ci <em class="parameter"><code>value</code></em> is not modified when 38502f4aeb0Sopenharmony_ci <code class="constant">EGL_FALSE</code> is returned. 38602f4aeb0Sopenharmony_ci </p> 38702f4aeb0Sopenharmony_ci <p> 38802f4aeb0Sopenharmony_ci <code class="constant">EGL_BAD_DISPLAY</code> is generated if 38902f4aeb0Sopenharmony_ci <em class="parameter"><code>display</code></em> is not an EGL display connection. 39002f4aeb0Sopenharmony_ci </p> 39102f4aeb0Sopenharmony_ci <p> 39202f4aeb0Sopenharmony_ci <code class="constant">EGL_NOT_INITIALIZED</code> is generated if 39302f4aeb0Sopenharmony_ci <em class="parameter"><code>display</code></em> has not been initialized. 39402f4aeb0Sopenharmony_ci </p> 39502f4aeb0Sopenharmony_ci <p> 39602f4aeb0Sopenharmony_ci <code class="constant">EGL_BAD_SURFACE</code> is generated if 39702f4aeb0Sopenharmony_ci <em class="parameter"><code>surface</code></em> is not an EGL surface. 39802f4aeb0Sopenharmony_ci </p> 39902f4aeb0Sopenharmony_ci <p> 40002f4aeb0Sopenharmony_ci <code class="constant">EGL_BAD_ATTRIBUTE</code> is generated if 40102f4aeb0Sopenharmony_ci <em class="parameter"><code>attribute</code></em> is not a valid surface attribute. 40202f4aeb0Sopenharmony_ci </p> 40302f4aeb0Sopenharmony_ci </div> 40402f4aeb0Sopenharmony_ci <div class="refsect1" id="seealso"> 40502f4aeb0Sopenharmony_ci <h2>See Also</h2> 40602f4aeb0Sopenharmony_ci <p> 40702f4aeb0Sopenharmony_ci <a class="citerefentry" href="eglCreatePbufferSurface.xhtml"><span class="citerefentry"><span class="refentrytitle">eglCreatePbufferSurface</span></span></a>, 40802f4aeb0Sopenharmony_ci <a class="citerefentry" href="eglCreatePixmapSurface.xhtml"><span class="citerefentry"><span class="refentrytitle">eglCreatePixmapSurface</span></span></a>, 40902f4aeb0Sopenharmony_ci <a class="citerefentry" href="eglCreateWindowSurface.xhtml"><span class="citerefentry"><span class="refentrytitle">eglCreateWindowSurface</span></span></a>, 41002f4aeb0Sopenharmony_ci <a class="citerefentry" href="eglSurfaceAttrib.xhtml"><span class="citerefentry"><span class="refentrytitle">eglSurfaceAttrib</span></span></a>, 41102f4aeb0Sopenharmony_ci <a class="citerefentry" href="eglSwapBuffers.xhtml"><span class="citerefentry"><span class="refentrytitle">eglSwapBuffers</span></span></a> 41202f4aeb0Sopenharmony_ci </p> 41302f4aeb0Sopenharmony_ci </div> 41402f4aeb0Sopenharmony_ci <p> 41502f4aeb0Sopenharmony_ci </p> 41602f4aeb0Sopenharmony_ci <div class="refsect3" id="copyright"> 41702f4aeb0Sopenharmony_ci <img src="KhronosLogo.jpg"/> 41802f4aeb0Sopenharmony_ci <p> 41902f4aeb0Sopenharmony_ci Copyright © 2003-2014 The Khronos Group Inc. 42002f4aeb0Sopenharmony_ci Permission is hereby granted, free of charge, to any person obtaining a 42102f4aeb0Sopenharmony_ci copy of this software and/or associated documentation files (the 42202f4aeb0Sopenharmony_ci "Materials"), to deal in the Materials without restriction, including 42302f4aeb0Sopenharmony_ci without limitation the rights to use, copy, modify, merge, publish, 42402f4aeb0Sopenharmony_ci distribute, sublicense, and/or sell copies of the Materials, and to 42502f4aeb0Sopenharmony_ci permit persons to whom the Materials are furnished to do so, subject to 42602f4aeb0Sopenharmony_ci the condition that this copyright notice and permission notice shall be included 42702f4aeb0Sopenharmony_ci in all copies or substantial portions of the Materials. 42802f4aeb0Sopenharmony_ci </p> 42902f4aeb0Sopenharmony_ci </div> 43002f4aeb0Sopenharmony_ci <p> 43102f4aeb0Sopenharmony_ci</p> 43202f4aeb0Sopenharmony_ci </div> 43302f4aeb0Sopenharmony_ci <footer/> 43402f4aeb0Sopenharmony_ci </body> 43502f4aeb0Sopenharmony_ci</html> 436
