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id="lvgl-performance-v9-d3752e5514-link">LVGL V9 性能优化</a><div class="wh-tooltip"><p class="shortdesc"></p></div></div></div></li></ul></li><li role="treeitem"><div data-tocid="id-d3752e5530" class="topicref" data-id="id" data-state="leaf"><span role="button" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/lvgl/lvgl_faq.html" id="id-d3752e5530-link">常见问题</a></div></div></li></ul></li></ul></li><li role="treeitem" aria-expanded="false"><div data-tocid="concept_nww_hzh_pzb-d3752e5544" class="topicref" data-id="concept_nww_hzh_pzb" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action concept_nww_hzh_pzb-d3752e5544-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/chapter-title/chapter-interface-sdk.html" id="concept_nww_hzh_pzb-d3752e5544-link">接口</a><div class="wh-tooltip"><p class="shortdesc">CAN<span class="ph">、CAP</span>、CIR、GPAI、GPIO、I2C、PSADC、PWM 等接口模块的介绍和使用说明。</p></div></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="chapter-safety-d3752e6799" class="topicref" data-id="chapter-safety" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action chapter-safety-d3752e6799-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/chapter-title/chapter-safety-sdk.html" id="chapter-safety-d3752e6799-link">安全</a><div class="wh-tooltip"><p class="shortdesc">SPI ENC、CE、eFuse 等安全模块的介绍和使用说明。</p></div></div></div></li></ul></li></ul></div>
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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">
|
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<span class="edit-link" style="font-size:12px; opacity:0.6; text-align:right; vertical-align:middle"><a target="_blank" href="http://aicdocco/taskstopics/sdk/lvgl/lvgl-performance-v8.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">LVGL V8 性能优化</h1>
|
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|
||
<div class="date inPage">16 May 2025</div><div style="color: gray;">
|
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Read time: 4 minute(s)
|
||
</div>
|
||
<div class="- topic/body concept/conbody body conbody"><p class="- topic/shortdesc shortdesc"></p>
|
||
<section class="- topic/section section" id="lvgl-performance-v8__section_mvj_g5p_bfc" data-ofbid="lvgl-performance-v8__section_mvj_g5p_bfc"><h2 class="- topic/title title sectiontitle">设置图片缓存张数</h2>
|
||
|
||
<p class="- topic/p p" data-ofbid="d68555e35__20250519091510">当新的图片被加载时，如果当前缓存未达到设定的上限，该图片会被添加到缓存中。在内存有限的情况下，可以通过以下方式进一步优化：</p>
|
||
<div class="- topic/p p" data-ofbid="d68555e38__20250519091510">
|
||
<ul class="- topic/ul ul" id="lvgl-performance-v8__ul_udy_gnh_fdc" data-ofbid="lvgl-performance-v8__ul_udy_gnh_fdc">
|
||
<li class="- topic/li li" data-ofbid="d68555e42__20250519091510">根据实际需求，动态调整图片缓存的大小。例如，在需要频繁切换的场景中，可以适当增加缓存数量以提高响应速度；而在其它场景中，则可以减少缓存数量以节省内存。</li>
|
||
</ul>
|
||
<ul class="- topic/ul ul" data-ofbid="d68555e46__20250519091510">
|
||
<li class="- topic/li li" data-ofbid="d68555e48__20250519091510">
|
||
<p class="- topic/p p" data-ofbid="d68555e50__20250519091510">释放不必要的缓存。在确定某些图片不再需要时，及时释放其缓存可以有效节省内存。例如，在场景切换时，可以调用<span class="+ topic/keyword pr-d/apiname keyword apiname">lv_img_cache_invalidate_src(NULL)</span>来释放所有缓存。</p>
|
||
<div class="- topic/p p" data-ofbid="d68555e56__20250519091510">
|
||
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="lvgl-performance-v8__codeblock_jnv_rmh_fdc" data-ofbid="lvgl-performance-v8__codeblock_jnv_rmh_fdc"><em class="hl-comment">// 释放对象 img_obj 的图片缓存</em>
|
||
lv_img_cache_invalidate_src(lv_img_get_src(img_obj));
|
||
|
||
<em class="hl-comment">// 释放所有的图片缓存，在场景切换时候，确定不需要已有的图片缓存可以这么调用</em>
|
||
lv_img_cache_invalidate_src(NULL);</pre>
|
||
</div>
|
||
<div class="- topic/p p" data-ofbid="d68555e62__20250519091510">如下配置中设置了八张图片缓存：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="lvgl-performance-v8__codeblock_ytd_smh_fdc" data-ofbid="lvgl-performance-v8__codeblock_ytd_smh_fdc">Application options --->
|
||
*** Filesystem related ***
|
||
[*] Using File System Image <span class="hl-number">0</span> --->
|
||
[ ] Using File System Image <span class="hl-number">1</span> ----
|
||
*** lvgl demo select related ***
|
||
-*- LVGL (official): powerful and easy-to-use embedded GUI library --->
|
||
-*- ArtInChip lvgl demo
|
||
select lvgl demo (lvgl demo with basic function) --->
|
||
(X) lvgl demo with basic function
|
||
( ) lvgl demo of meter
|
||
(<span class="hl-number">16</span>) LVGL color depth(<span class="hl-number">32</span>/<span class="hl-number">16</span>)
|
||
(<span class="hl-number">8</span>) LVGL image cached number
|
||
(/rodata/lvgl_data) LVGL Resource Directory</pre></div>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
</section>
|
||
<section class="- topic/section section" id="lvgl-performance-v8__section_ch2_pvp_bfc" data-ofbid="lvgl-performance-v8__section_ch2_pvp_bfc"><h2 class="- topic/title title sectiontitle">采用 rgb565 格式</h2>
|
||
|
||
<p class="- topic/p p" data-ofbid="d68555e76__20250519091510">选择合适的颜色深度和图片格式可以有效减少处理的数据量，例如 rgb565 格式，从而提升 UI 的处理速度。</p>
|
||
<div class="- topic/p p" data-ofbid="d68555e79__20250519091510">显示采用 rgb565 格式和 argb8888 相比减少了处理的数据量，可以提升 UI 的处理速度。以下示例中，LVGL color depth 为 16，并且配置
|
||
framebuffer 为
|
||
rgb565：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="lvgl-performance-v8__codeblock_szv_smh_fdc" data-ofbid="lvgl-performance-v8__codeblock_szv_smh_fdc">Application options --->
|
||
*** Filesystem related ***
|
||
[*] Using File System Image <span class="hl-number">0</span> --->
|
||
[ ] Using File System Image <span class="hl-number">1</span> ----
|
||
*** lvgl demo select related ***
|
||
-*- LVGL (official): powerful and easy-to-use embedded GUI library --->
|
||
-*- ArtInChip lvgl demo
|
||
select lvgl demo (lvgl demo with basic function) --->
|
||
(X) lvgl demo with basic function
|
||
( ) lvgl demo of meter
|
||
(<span class="hl-number">16</span>) LVGL color depth(<span class="hl-number">32</span>/<span class="hl-number">16</span>)
|
||
(<span class="hl-number">8</span>) LVGL image cached number
|
||
(/rodata/lvgl_data) LVGL Resource Directory</pre><pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="lvgl-performance-v8__codeblock_npz_jwp_bfc" data-ofbid="lvgl-performance-v8__codeblock_npz_jwp_bfc">Board options --->
|
||
[*] Using Display Engine (DE)
|
||
Display Parameter --->
|
||
select framebuffer format (rgb565) --->
|
||
[*] Support <strong class="hl-keyword">double</strong> framebuffer
|
||
[*] Enable Display Dither</pre></div>
|
||
</section>
|
||
<section class="- topic/section section" id="lvgl-performance-v8__section_qjq_pwp_bfc" data-ofbid="lvgl-performance-v8__section_qjq_pwp_bfc"><h2 class="- topic/title title sectiontitle">设置 FreeType 字体缓存个数</h2>
|
||
|
||
<div class="- topic/p p" data-ofbid="d68555e92__20250519091510">在 LVGL 中，FreeType 字体缓存的配置可以通过修改头文件 <span class="+ topic/ph sw-d/filepath ph filepath">lv_conf.h</span> 中的宏定义来实现。<div class="table-container"><table class="- topic/table table frame-all" id="lvgl-performance-v8__table_r34_jzp_bfc" data-ofbid="lvgl-performance-v8__table_r34_jzp_bfc" data-cols="2"><caption class="- topic/title title tablecap" data-caption-side="top" data-is-repeated="true"><span class="table--title-label">表<span class="table--title-label-number"> 1</span><span class="table--title-label-punctuation">. </span></span><span class="table--title">
|
||
<span class="+ topic/ph sw-d/filepath ph filepath">lv_conf.h</span> 中的宏定义</span></caption><colgroup><col style="width:33.33333333333333%"/><col style="width:66.66666666666666%"/></colgroup><thead class="- topic/thead thead">
|
||
<tr class="- topic/row">
|
||
<th class="- topic/entry entry colsep-1 rowsep-1" id="lvgl-performance-v8__table_r34_jzp_bfc__entry__1">宏定义参数</th>
|
||
<th class="- topic/entry entry colsep-0 rowsep-1" id="lvgl-performance-v8__table_r34_jzp_bfc__entry__2">描述</th>
|
||
</tr>
|
||
</thead><tbody class="- topic/tbody tbody">
|
||
<tr class="- topic/row">
|
||
<td class="- topic/entry entry colsep-1 rowsep-1" headers="lvgl-performance-v8__table_r34_jzp_bfc__entry__1">LV_FREETYPE_CACHE_SIZE</td>
|
||
<td class="- topic/entry entry colsep-0 rowsep-1" headers="lvgl-performance-v8__table_r34_jzp_bfc__entry__2">设置 FreeType 缓存的总大小（以字节为单位）<ul class="- topic/ul ul" id="lvgl-performance-v8__ul_w5c_mzp_bfc" data-ofbid="lvgl-performance-v8__ul_w5c_mzp_bfc">
|
||
<li class="- topic/li li" data-ofbid="d68555e134__20250519091510">数值越大，运行速度越快，但是占用的内存也会越多。</li>
|
||
<li class="- topic/li li" data-ofbid="d68555e137__20250519091510">当设置为 -1 时，表示关闭缓存。</li>
|
||
</ul></td>
|
||
</tr>
|
||
<tr class="- topic/row">
|
||
<td class="- topic/entry entry colsep-1 rowsep-1" headers="lvgl-performance-v8__table_r34_jzp_bfc__entry__1">LV_FREETYPE_SBIT_CACHE:</td>
|
||
<td class="- topic/entry entry colsep-0 rowsep-1" headers="lvgl-performance-v8__table_r34_jzp_bfc__entry__2">选择位图缓存的类型。<ul class="- topic/ul ul" id="lvgl-performance-v8__ul_k14_yzp_bfc" data-ofbid="lvgl-performance-v8__ul_k14_yzp_bfc">
|
||
<li class="- topic/li li" data-ofbid="d68555e151__20250519091510">设置为 1 时，使用 sbit 缓存，这在处理小尺寸字体（小于 256）时更加高效。</li>
|
||
<li class="- topic/li li" data-ofbid="d68555e154__20250519091510">设置为 0 时，使用图像缓存，适用于大尺寸字体（大于等于 256）。</li>
|
||
</ul></td>
|
||
</tr>
|
||
<tr class="- topic/row">
|
||
<td class="- topic/entry entry colsep-1 rowsep-1" headers="lvgl-performance-v8__table_r34_jzp_bfc__entry__1">LV_FREETYPE_CACHE_FT_FACES</td>
|
||
<td class="- topic/entry entry colsep-0 rowsep-1" headers="lvgl-performance-v8__table_r34_jzp_bfc__entry__2">设置缓存管理的 FT_Face 对象的最大数量。<ul class="- topic/ul ul" id="lvgl-performance-v8__ul_zy3_pzp_bfc" data-ofbid="lvgl-performance-v8__ul_zy3_pzp_bfc">
|
||
<li class="- topic/li li" data-ofbid="d68555e168__20250519091510">设置为 0 时，使用系统默认值，默认值为 2。</li>
|
||
<li class="- topic/li li" data-ofbid="d68555e171__20250519091510">如需打开多个字体文件，增加缓存管理的 FT_Face 对象的最大数量，可以提升字体的运行速度。</li>
|
||
</ul></td>
|
||
</tr>
|
||
<tr class="- topic/row">
|
||
<td class="- topic/entry entry colsep-1 rowsep-0" headers="lvgl-performance-v8__table_r34_jzp_bfc__entry__1">LV_FREETYPE_CACHE_FT_SIZES</td>
|
||
<td class="- topic/entry entry colsep-0 rowsep-0" headers="lvgl-performance-v8__table_r34_jzp_bfc__entry__2">设置缓存管理的 FT_Size 对象的最大数量。<ul class="- topic/ul ul" id="lvgl-performance-v8__ul_htl_b1q_bfc" data-ofbid="lvgl-performance-v8__ul_htl_b1q_bfc">
|
||
<li class="- topic/li li" data-ofbid="d68555e185__20250519091510">设置为 0 时，使用系统默认值，默认值为 4。</li>
|
||
<li class="- topic/li li" data-ofbid="d68555e188__20250519091510">如需显示多种不同 size 的字体时，增加缓存管理的 FT_Size
|
||
对象的最大数量，可以提升字体的运行速度。</li>
|
||
</ul></td>
|
||
</tr>
|
||
</tbody></table></div></div>
|
||
<div class="- topic/p p" data-ofbid="d68555e196__20250519091510">
|
||
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="lvgl-performance-v8__codeblock_mby_vwp_bfc" data-ofbid="lvgl-performance-v8__codeblock_mby_vwp_bfc">#<span class="hl-directive">define</span> LV_USE_FREETYPE <span class="hl-number">1</span>
|
||
#<strong class="hl-keyword">if</strong> LV_USE_FREETYPE
|
||
<em class="hl-comment">// Memory used by FreeType to cache characters [bytes]</em>
|
||
#<span class="hl-directive">define</span> LV_FREETYPE_CACHE_SIZE (<span class="hl-number">128</span> * <span class="hl-number">1024</span>)
|
||
#<strong class="hl-keyword">if</strong> LV_FREETYPE_CACHE_SIZE >= <span class="hl-number">0</span>
|
||
<em class="hl-comment">// 1: bitmap cache use the sbit cache, 0:bitmap cache use the image cache.</em>
|
||
<em class="hl-comment">// sbit cache:it is much more memory efficient for small bitmaps(font size < 256)</em>
|
||
<em class="hl-comment">// if font size >= 256, must be configured as image cache */</em>
|
||
#<span class="hl-directive">define</span> LV_FREETYPE_SBIT_CACHE <span class="hl-number">0</span>
|
||
<em class="hl-comment">// Maximum number of opened FT_Face/FT_Size objects managed by this cache instance.</em>
|
||
<em class="hl-comment">// (0:use system defaults)</em>
|
||
#<span class="hl-directive">define</span> LV_FREETYPE_CACHE_FT_FACES <span class="hl-number">0</span>
|
||
#<span class="hl-directive">define</span> LV_FREETYPE_CACHE_FT_SIZES <span class="hl-number">0</span>
|
||
#endif
|
||
#endif</pre>
|
||
</div>
|
||
</section>
|
||
<section class="- topic/section section" id="lvgl-performance-v8__section_uh2_pvp_bfc" data-ofbid="lvgl-performance-v8__section_uh2_pvp_bfc"><h2 class="- topic/title title sectiontitle">其他优化方式</h2>
|
||
|
||
<div class="- topic/p p" data-ofbid="d68555e208__20250519091510">
|
||
<ol class="- topic/ol ol" id="lvgl-performance-v8__ol_irj_t5p_bfc" data-ofbid="lvgl-performance-v8__ol_irj_t5p_bfc">
|
||
<li class="- topic/li li" data-ofbid="d68555e212__20250519091510">
|
||
<p class="- topic/p p" data-ofbid="d68555e214__20250519091510">对于不透明的图片，可以选择采用 JPEG 格式。JPEG 图片的解码速度通常比 PNG 速度快。</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d68555e218__20250519091510">
|
||
<div class="- topic/p p" data-ofbid="d68555e220__20250519091510">在定时器或动画回调函数中，避免执行耗时过长的函数，以免影响 UI 的流畅性。可以考虑以下方法：<ul class="- topic/ul ul" id="lvgl-performance-v8__ul_f2k_14h_fdc" data-ofbid="lvgl-performance-v8__ul_f2k_14h_fdc">
|
||
<li class="- topic/li li" data-ofbid="d68555e224__20250519091510">
|
||
<p class="- topic/p p" data-ofbid="d68555e226__20250519091510">LVGL 的 UI 绘制是单线程的，将耗时操作放到后台线程中执行，避免阻塞主线程。</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d68555e230__20250519091510">
|
||
<p class="- topic/p p" data-ofbid="d68555e232__20250519091510">将大任务拆分成多个小任务，通过多次调用来完成，每次只处理一小部分工作。</p>
|
||
</li>
|
||
</ul></div>
|
||
</li>
|
||
</ol>
|
||
</div>
|
||
</section>
|
||
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