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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-v9.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">LVGL V9 性能优化</h1>
|
||
|
||
<div class="date inPage">16 May 2025</div><div style="color: gray;">
|
||
Read time: 5 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-v9__section_mvj_g5p_bfc" data-ofbid="lvgl-performance-v9__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="d207870e35__20250519091528">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="d207870e38__20250519091528">
|
||
<ul class="- topic/ul ul" id="lvgl-performance-v9__ul_udy_gnh_fdc" data-ofbid="lvgl-performance-v9__ul_udy_gnh_fdc">
|
||
<li class="- topic/li li" data-ofbid="d207870e42__20250519091528">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" id="lvgl-performance-v9__ul_i5t_qvp_bfc" data-ofbid="lvgl-performance-v9__ul_i5t_qvp_bfc">
|
||
<li class="- topic/li li" data-ofbid="d207870e48__20250519091528">
|
||
<p class="- topic/p p" data-ofbid="d207870e50__20250519091528">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="d207870e56__20250519091528">
|
||
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="lvgl-performance-v9__codeblock_jnv_rmh_fdc" data-ofbid="lvgl-performance-v9__codeblock_jnv_rmh_fdc"><em class="hl-comment">// 释放对象 img_obj 的图片缓存</em>
|
||
lv_image_cache_drop(lv_image_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_image_cache_drop(NULL);</pre>
|
||
</div>
|
||
<div class="- topic/p p" data-ofbid="d207870e62__20250519091528">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-v9__codeblock_ytd_smh_fdc" data-ofbid="lvgl-performance-v9__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-v9__section_ygm_svp_bfc" data-ofbid="lvgl-performance-v9__section_ygm_svp_bfc"><h2 class="- topic/title title sectiontitle">设置图片缓存大小</h2>
|
||
|
||
<div class="- topic/p p" data-ofbid="d207870e76__20250519091528">设置图片的缓存
|
||
size，缓存越大，运行速度越快，但是占用的内存也会越多。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="lvgl-performance-v9__codeblock_rlv_tvp_bfc" data-ofbid="lvgl-performance-v9__codeblock_rlv_tvp_bfc">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
|
||
(<span class="hl-number">0x800000</span>) LVGL image cached size
|
||
(<span class="hl-number">20</span>) LVGL image header cached number
|
||
(/rodata/lvgl_data) LVGL Resource Directory</pre></div>
|
||
</section>
|
||
<section class="- topic/section section" id="lvgl-performance-v9__section_rmf_fwp_bfc" data-ofbid="lvgl-performance-v9__section_rmf_fwp_bfc"><h2 class="- topic/title title sectiontitle">设置图片头信息缓存个数</h2>
|
||
|
||
<div class="- topic/p p" data-ofbid="d207870e87__20250519091528">对图片的头信息进行缓存，图片的头信息一般占用内存不多，但是如果图像的头信息需要频繁的从文件系统中去读取，也会影响运行速度，
|
||
用户可以根据需要，设置合适的图片头信息缓存个数。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="lvgl-performance-v9__codeblock_wch_gwp_bfc" data-ofbid="lvgl-performance-v9__codeblock_wch_gwp_bfc">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
|
||
(<span class="hl-number">0x800000</span>) LVGL image cached size
|
||
(<span class="hl-number">20</span>) LVGL image header cached number
|
||
(/rodata/lvgl_data) LVGL Resource Directory</pre></div>
|
||
</section>
|
||
<section class="- topic/section section" id="lvgl-performance-v9__section_ch2_pvp_bfc" data-ofbid="lvgl-performance-v9__section_ch2_pvp_bfc"><h2 class="- topic/title title sectiontitle">采用 rgb565 格式</h2>
|
||
|
||
<p class="- topic/p p" data-ofbid="d207870e98__20250519091528">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="d207870e101__20250519091528">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-v9__codeblock_szv_smh_fdc" data-ofbid="lvgl-performance-v9__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-v9__codeblock_npz_jwp_bfc" data-ofbid="lvgl-performance-v9__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-v9__section_a21_xwp_bfc" data-ofbid="lvgl-performance-v9__section_a21_xwp_bfc"><h2 class="- topic/title title sectiontitle">设置 Freetype 字体缓存个数</h2>
|
||
|
||
<div class="- topic/p p" data-ofbid="d207870e114__20250519091528">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-v9__table_usl_41q_bfc" data-ofbid="lvgl-performance-v9__table_usl_41q_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-v9__table_usl_41q_bfc__entry__1">宏定义参数</th>
|
||
<th class="- topic/entry entry colsep-0 rowsep-1" id="lvgl-performance-v9__table_usl_41q_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-v9__table_usl_41q_bfc__entry__1">LV_FREETYPE_USE_LVGL_PORT</td>
|
||
<td class="- topic/entry entry colsep-0 rowsep-1" headers="lvgl-performance-v9__table_usl_41q_bfc__entry__2">决定是否让 FreeType 使用 LVGL 的内存和文件接口。<ul class="- topic/ul ul" id="lvgl-performance-v9__ul_fqj_w1q_bfc" data-ofbid="lvgl-performance-v9__ul_fqj_w1q_bfc">
|
||
<li class="- topic/li li" data-ofbid="d207870e155__20250519091528">设置为 0 时，表示不使用 LVGL 的内存和文件接口。</li>
|
||
</ul></td>
|
||
</tr>
|
||
<tr class="- topic/row">
|
||
<td class="- topic/entry entry colsep-1 rowsep-0" headers="lvgl-performance-v9__table_usl_41q_bfc__entry__1">LV_FREETYPE_CACHE_FT_GLYPH_CNT</td>
|
||
<td class="- topic/entry entry colsep-0 rowsep-0" headers="lvgl-performance-v9__table_usl_41q_bfc__entry__2">设置 FreeType 缓存的字形数量。<ul class="- topic/ul ul" id="lvgl-performance-v9__ul_lzr_w1q_bfc" data-ofbid="lvgl-performance-v9__ul_lzr_w1q_bfc">
|
||
<li class="- topic/li li" data-ofbid="d207870e169__20250519091528">数值越大，运行速度越快，但占用的内存也会越多。</li>
|
||
</ul></td>
|
||
</tr>
|
||
</tbody></table></div></div>
|
||
<div class="- topic/p p" data-ofbid="d207870e177__20250519091528">
|
||
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="lvgl-performance-v9__codeblock_odz_zwp_bfc" data-ofbid="lvgl-performance-v9__codeblock_odz_zwp_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">/*Let FreeType to use LVGL memory and file porting*/</em>
|
||
#<span class="hl-directive">define</span> LV_FREETYPE_USE_LVGL_PORT <span class="hl-number">0</span>
|
||
|
||
<em class="hl-comment">/*Cache count of the glyphs in FreeType. It means the number of glyphs that can be cached.
|
||
*The higher the value, the more memory will be used.*/</em>
|
||
#<span class="hl-directive">define</span> LV_FREETYPE_CACHE_FT_GLYPH_CNT <span class="hl-number">256</span>
|
||
#endif</pre>
|
||
</div>
|
||
</section>
|
||
<section class="- topic/section section" id="lvgl-performance-v9__section_rns_zvp_bfc" data-ofbid="lvgl-performance-v9__section_rns_zvp_bfc"><h2 class="- topic/title title sectiontitle">其他优化方式</h2>
|
||
|
||
<div class="- topic/p p" data-ofbid="d207870e190__20250519091528">
|
||
<ol class="- topic/ol ol" id="lvgl-performance-v9__ol_irj_t5p_bfc" data-ofbid="lvgl-performance-v9__ol_irj_t5p_bfc">
|
||
<li class="- topic/li li" data-ofbid="d207870e194__20250519091528">
|
||
<p class="- topic/p p" data-ofbid="d207870e196__20250519091528">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="d207870e200__20250519091528">
|
||
<div class="- topic/p p" data-ofbid="d207870e202__20250519091528">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-v9__ul_f2k_14h_fdc" data-ofbid="lvgl-performance-v9__ul_f2k_14h_fdc">
|
||
<li class="- topic/li li" data-ofbid="d207870e206__20250519091528">
|
||
<p class="- topic/p p" data-ofbid="d207870e208__20250519091528">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="d207870e212__20250519091528">
|
||
<p class="- topic/p p" data-ofbid="d207870e214__20250519091528">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>
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</li>
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</ul></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="#lvgl-performance-v9__section_mvj_g5p_bfc" data-tocid="lvgl-performance-v9__section_mvj_g5p_bfc">设置图片缓存张数</a></div></li><li class="section-item"><div class="section-title"><a href="#lvgl-performance-v9__section_ygm_svp_bfc" data-tocid="lvgl-performance-v9__section_ygm_svp_bfc">设置图片缓存大小</a></div></li><li class="section-item"><div class="section-title"><a href="#lvgl-performance-v9__section_rmf_fwp_bfc" data-tocid="lvgl-performance-v9__section_rmf_fwp_bfc">设置图片头信息缓存个数</a></div></li><li class="section-item"><div class="section-title"><a href="#lvgl-performance-v9__section_ch2_pvp_bfc" data-tocid="lvgl-performance-v9__section_ch2_pvp_bfc">采用 rgb565 格式</a></div></li><li class="section-item"><div class="section-title"><a href="#lvgl-performance-v9__section_a21_xwp_bfc" data-tocid="lvgl-performance-v9__section_a21_xwp_bfc">设置 Freetype 字体缓存个数</a></div></li><li class="section-item"><div class="section-title"><a href="#lvgl-performance-v9__section_rns_zvp_bfc" data-tocid="lvgl-performance-v9__section_rns_zvp_bfc">其他优化方式</a></div></li></ul></div>
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