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<div class=" wh_topic_content body "><main role="main"><article class="- topic/topic concept/concept topic concept" role="article" aria-labelledby="ariaid-title1"><span class="edit-link" style="font-size:12px; opacity:0.6; text-align:right; vertical-align:middle"><a target="_blank" href="http://172.16.35.88/tasks/jdssno1uvvbf2mltu9kb9v3if05d5gopuakboe8hlud18rma/edit/F:/aicdita/aicdita-cn/topics/sdk/display/display_fb_rotation.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">屏幕旋转</h1><div class="date inPage">4 Dec 2024</div><div style="color: gray;">
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Read time: 2 minute(s)
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</div><div class="- topic/body concept/conbody body conbody"><div class="- topic/div div">
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<p class="- topic/p p" data-ofbid="d106524e25__20250121171540">ArtInChip 平台支持屏幕旋转，支持竖屏横用和横屏竖用，兼容单缓冲 和双缓冲的应用程序。</p>
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<p class="- topic/p p" data-ofbid="d106524e28__20250121171540">Display Engine 并不提供旋转功能，旋转是由显示驱动调用 Graphics Engine 实现的。支持顺时针旋转 0°/ 90°/ 180°/
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270°。</p>
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</div><section class="- topic/section section" id="concept_xpy_32b_ybc__section_pyq_w3g_d1c" data-ofbid="concept_xpy_32b_ybc__section_pyq_w3g_d1c"><h2 class="- topic/title title sectiontitle">LCD 适配</h2>
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<div class="- topic/div div">
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<p class="- topic/p p" data-ofbid="d106524e38__20250121171540">无论是竖屏横用，还是横屏竖用，在适配 LCD 屏幕时，按照屏幕的物理宽高配置时序参数即可，不需要将时序参数中的宽高互换。</p>
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<p class="- topic/p p" data-ofbid="d106524e41__20250121171540">显示驱动在旋转时会根据旋转角度自动互换宽高。LCD 屏幕适配可参考<a xml:lang="zh-CN" lang="zh-CN" class="- topic/xref xref" href="../../../reusables/reused-topics/../../topics/sdk/display/display_panel_port.html">屏适配指南</a>。</p>
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</div>
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</section><section class="- topic/section section" id="concept_xpy_32b_ybc__section_qyq_w3g_d1c" data-ofbid="concept_xpy_32b_ybc__section_qyq_w3g_d1c"><h2 class="- topic/title title sectiontitle">device tree</h2>
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<div class="- topic/p p" data-ofbid="d106524e54__20250121171540">屏幕旋转的 device tree 配置集中在 fb0 节点。以 720x1280
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屏幕的竖屏横用场景为例：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="concept_xpy_32b_ybc__codeblock_tcn_1jg_d1c" data-ofbid="concept_xpy_32b_ybc__codeblock_tcn_1jg_d1c">&fb0 {
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artinchip,uboot-logo-on=<<span class="hl-number">1</span>>;
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rotation-degress = <<span class="hl-number">270</span>>;
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height-virtual = <<span class="hl-number">1440</span>>; <em class="hl-comment">// 720 * 2</em>
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port {
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fb0_out: endpoint {
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remote-endpoint = <&de0_in>;
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};
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};
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};</pre></div>
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<div class="- topic/p p" data-ofbid="d106524e59__20250121171540">如果不设置 disp-buf-num 属性，显示 buffer 个数与 height-virtual 绑定。<ul class="- topic/ul ul" id="concept_xpy_32b_ybc__ul_yyq_w3g_d1c" data-ofbid="concept_xpy_32b_ybc__ul_yyq_w3g_d1c"><li class="- topic/li li" data-ofbid="d106524e62__20250121171540">
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<p class="- topic/p p" data-ofbid="d106524e64__20250121171540">height-virtual 不设置，height-virtual 缺省等于 height，显示 buffer 个数为 1。</p>
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</li><li class="- topic/li li" data-ofbid="d106524e67__20250121171540">
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<p class="- topic/p p" data-ofbid="d106524e69__20250121171540">height-virtual 设置为 height 的两倍，使用双 framebuffer，显示 buffer 个数自动适配为 2。</p>
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</li></ul></div>
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<div class="- topic/note note note note_note" id="concept_xpy_32b_ybc__note_o2d_spk_ndc" data-ofbid="concept_xpy_32b_ybc__note_o2d_spk_ndc"><span class="note__title">注：</span> 关于详细的参数描述，可查看<a class="- topic/xref xref" href="display_parameter_display_fb0.html">Display FB0</a>。</div>
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</section><section class="- topic/section section" id="concept_xpy_32b_ybc__section_zyq_w3g_d1c" data-ofbid="concept_xpy_32b_ybc__section_zyq_w3g_d1c"><h2 class="- topic/title title sectiontitle">实现原理</h2>
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<div class="- topic/div div">
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<p class="- topic/p p" data-ofbid="d106524e87__20250121171540">屏幕旋转时，显示驱动管理着两种 buffer：</p>
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<ul class="- topic/ul ul" id="concept_xpy_32b_ybc__ul_x4y_jrk_ndc" data-ofbid="concept_xpy_32b_ybc__ul_x4y_jrk_ndc"><li class="- topic/li li" data-ofbid="d106524e91__20250121171540">
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<p class="- topic/p p" data-ofbid="d106524e93__20250121171540">上层 GUI 应用使用的绘制 buffer，用于存储绘制的图像数据。</p>
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<p class="- topic/p p" data-ofbid="d106524e96__20250121171540">GUI 以横屏的方式在绘制 buf 中绘制好界面，然后<span class="- topic/ph ph">下发 ioctl
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<span class="+ topic/keyword pr-d/parmname keyword parmname">FBIOPAN_DISPLAY</span></span>。</p>
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<p class="- topic/p p" data-ofbid="d106524e104__20250121171540">如果配置了屏幕旋转，显示驱动在接收到 <span class="- topic/ph ph"><span class="+ topic/keyword pr-d/parmname keyword parmname">FBIOPAN_DISPLAY</span></span> 后，调用
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Graphics Engine 将横屏界面旋转为竖屏，并把数据 bitblt 到显示 buf 中。</p>
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</li><li class="- topic/li li" data-ofbid="d106524e111__20250121171540">
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<p class="- topic/p p" id="concept_xpy_32b_ybc__p_ltc_hrk_ndc" data-ofbid="concept_xpy_32b_ybc__p_ltc_hrk_ndc">Display Engine 使用的显示
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buffer，即底层显示引擎使用的缓冲区，用于将最终的图像数据传输到 LCD 屏幕上。</p>
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<p class="- topic/p p" data-ofbid="d106524e116__20250121171540">Display Engine 将显示 buf 中的数据传送给 LCD
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屏幕。显示缓冲区与绘制缓冲区在物理上是连续的内存块，但它们的布局会根据屏幕的旋转角度不同而有所变化。</p>
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</li></ul>
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</div>
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<div class="- topic/p p" data-ofbid="d106524e121__20250121171540">以竖屏横用为例，底层的内存使用情况如下所示：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="concept_xpy_32b_ybc__codeblock_gpr_cjg_d1c" data-ofbid="concept_xpy_32b_ybc__codeblock_gpr_cjg_d1c">+--------------------+
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| 绘制 buf |
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+---------+----------+
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|显示 buf |
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+---------+</pre></div>
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<p class="- topic/p p" data-ofbid="d106524e126__20250121171540">这两块 buf 其实是一大块物理连续内存，对应<span class="- topic/ph ph"> /dev/fb0</span>，只是横屏和竖屏的 stride
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不同，才会有不同的内存布局。横屏竖用的原理类似。</p>
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<div class="- topic/note note note note_note" id="concept_xpy_32b_ybc__note_prd_djg_d1c" data-ofbid="concept_xpy_32b_ybc__note_prd_djg_d1c"><span class="note__title">注：</span>
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<p class="- topic/p p" data-ofbid="d106524e134__20250121171540">在编写 GUI 应用程序时要注意，通过标准接口获得的参数与屏幕的实际宽高是相反的。 GUI 获取到横屏的参数，认为外接了一块横屏才会以横屏的方式绘制界面。</p>
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<p class="- topic/p p" data-ofbid="d106524e137__20250121171540">此外，GUI 只能操作到绘制 buf ，显示 buf 对 GUI 来说是透明的。</p>
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</div>
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<div class=" wh_topic_toc "><div class="wh_topic_label">在本页上</div><ul><li class="section-item"><div class="section-title"><a href="#concept_xpy_32b_ybc__section_pyq_w3g_d1c" data-tocid="concept_xpy_32b_ybc__section_pyq_w3g_d1c">LCD 适配</a></div></li><li class="section-item"><div class="section-title"><a href="#concept_xpy_32b_ybc__section_qyq_w3g_d1c" data-tocid="concept_xpy_32b_ybc__section_qyq_w3g_d1c">device tree</a></div></li><li class="section-item"><div class="section-title"><a href="#concept_xpy_32b_ybc__section_zyq_w3g_d1c" data-tocid="concept_xpy_32b_ybc__section_zyq_w3g_d1c">实现原理</a></div></li></ul></div>
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