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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/lvgl/lvgl-hw-decoder.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">硬件解码对接</h1><div class="date inPage">15 Jan 2024</div><div style="color: gray;">
Read time: 1 minute(s)
</div><div class="- topic/body concept/conbody body conbody"><p class="- topic/p p" data-ofbid="d330668e24__20250121171832">通过 <span class="+ topic/keyword pr-d/apiname keyword apiname">lv_img_decoder_t</span> 可以注册硬件解码器接口，从而提升图像加载和渲染的效率。</p><div class="- topic/p p" data-ofbid="d330668e29__20250121171832">注册解码器过程如下所示；<ol class="- topic/ol ol" id="lvgl-hw-decoder__ol_drs_4dh_fdc" data-ofbid="lvgl-hw-decoder__ol_drs_4dh_fdc"><li class="- topic/li li" data-ofbid="d330668e32__20250121171832">定义一个解码器结构体，并初始化。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="lvgl-hw-decoder__codeblock_iz5_m1g_fdc" data-ofbid="lvgl-hw-decoder__codeblock_iz5_m1g_fdc"><strong class="hl-keyword">void</strong> aic_dec_create()
{
lv_img_decoder_t *aic_dec = lv_img_decoder_create();
<em class="hl-comment">/* init frame info lists */</em>
mpp_list_init(&amp;buf_list);
lv_img_decoder_set_info_cb(aic_dec, aic_decoder_info);
lv_img_decoder_set_open_cb(aic_dec, aic_decoder_open);
lv_img_decoder_set_close_cb(aic_dec, aic_decoder_close);
}</pre></li><li class="- topic/li li" data-ofbid="d330668e36__20250121171832">实现 <span class="+ topic/keyword pr-d/apiname keyword apiname">aic_decoder_info</span> 回调函数，用于获取图片的宽度、高度和格式信息。</li><li class="- topic/li li" data-ofbid="d330668e41__20250121171832">实现 <span class="+ topic/keyword pr-d/apiname keyword apiname">aic_decoder_open</span> 回调函数，用于申请解码输出 buffer。</li><li class="- topic/li li" data-ofbid="d330668e46__20250121171832">实现 <span class="+ topic/keyword pr-d/apiname keyword apiname">aic_decoder_close</span> 回调函数，用于释放硬件解码资源。</li><li class="- topic/li li" data-ofbid="d330668e51__20250121171832">在绘制函数 <span class="+ topic/keyword pr-d/apiname keyword apiname">draw_img_decoded</span>中，通过注册解码器回调去获取需要的解码后数据，默认的图片处理流程如下所示：<figure class="- topic/fig fig fignone" id="lvgl-hw-decoder__id20" data-ofbid="lvgl-hw-decoder__id20"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="lvgl-hw-decoder__image_m1h_1zf_fdc" src="../../../images/lvgl/draw_img_decoded.png" alt="draw_img_decoded"/></div><br/><figcaption data-caption-side="bottom" class="- topic/title title figcapcenter"><span class="figtitleprefix fig--title-label">图<span class="fig--title-label-number"> 1</span><span class="fig--title-label-punctuation">. </span></span><span class="fig--title">draw_img_decoded </span></figcaption></figure><ul class="- topic/ul ul simple" id="lvgl-hw-decoder__ul_n1h_1zf_fdc" data-ofbid="lvgl-hw-decoder__ul_n1h_1zf_fdc"><li class="- topic/li li" data-ofbid="d330668e63__20250121171832">
<p class="- topic/p p" data-ofbid="d330668e65__20250121171832">采用此流程需要额外申请一块解码 buffer，占用内存增加。</p>
</li><li class="- topic/li li" data-ofbid="d330668e68__20250121171832">
<p class="- topic/p p" data-ofbid="d330668e70__20250121171832">缓存解码后的 buffer，下次再显示同样的 image，不用重复解码，加快 UI 加载速度。</p>
</li></ul><p class="- topic/p p" data-ofbid="d330668e73__20250121171832">当绘制函数为 draw_img 时，硬件解码在函数 draw_img
内部，无需注册解码回调函数，默认不采用此方法。在内存受限的场景下，可以评估此方法是否可满足场景需求。</p><figure class="- topic/fig fig fignone" id="lvgl-hw-decoder__id21" data-ofbid="lvgl-hw-decoder__id21"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="lvgl-hw-decoder__image_o1h_1zf_fdc" src="../../../images/lvgl/draw_img.png" alt="draw_img"/></div><br/><figcaption data-caption-side="bottom" class="- topic/title title figcapcenter"><span class="figtitleprefix fig--title-label">图<span class="fig--title-label-number"> 2</span><span class="fig--title-label-punctuation">. </span></span><span class="fig--title">draw_img</span></figcaption></figure><ul class="- topic/ul ul simple" id="lvgl-hw-decoder__ul_p1h_1zf_fdc" data-ofbid="lvgl-hw-decoder__ul_p1h_1zf_fdc"><li class="- topic/li li" data-ofbid="d330668e82__20250121171832">
<p class="- topic/p p" data-ofbid="d330668e84__20250121171832">采用此流程无需额外申请解码 buffer，直接解码到绘制 buffer</p>
</li><li class="- topic/li li" data-ofbid="d330668e87__20250121171832">
<p class="- topic/p p" data-ofbid="d330668e89__20250121171832">当需要进行 alpha blending 的时候，此方法不可行</p>
</li><li class="- topic/li li" data-ofbid="d330668e92__20250121171832">
<p class="- topic/p p" data-ofbid="d330668e94__20250121171832">每次都要重新对 image 解码，速度不如 draw_img_decoded</p>
</li><li class="- topic/li li" data-ofbid="d330668e97__20250121171832">
<p class="- topic/p p" data-ofbid="d330668e99__20250121171832">当硬件解码不支持裁剪的时进行局部更新，此方法不可行</p>
</li></ul></li><li class="- topic/li li" data-ofbid="d330668e102__20250121171832">通过 <span class="+ topic/keyword pr-d/apiname keyword apiname">lv_img_cache_set_size</span> 设置缓存的图片数量，以优化 UI
流畅性。<p class="- topic/p p" data-ofbid="d330668e107__20250121171832">如果图片的读取时间或者解码时间比较长，采用图片缓存机制可以提升 UI 流畅性：</p><ol class="- topic/ol ol arabic simple" type="a" id="lvgl-hw-decoder__ol_q1h_1zf_fdc" data-ofbid="lvgl-hw-decoder__ol_q1h_1zf_fdc"><li class="- topic/li li" data-ofbid="d330668e110__20250121171832">
<p class="- topic/p p" data-ofbid="d330668e112__20250121171832"><strong class="+ topic/ph hi-d/b ph b">打开或关闭图片缓冲机制</strong></p>
<div class="- topic/p p" data-ofbid="d330668e116__20250121171832">在 <span class="+ topic/ph sw-d/filepath ph filepath">lv_conf.h</span> 文件中，采用 lv_img_decoder_t
提供的接口注册的解码器，控制是否启用 LVGL 内部的图片缓冲机制：<ul class="- topic/ul ul" id="lvgl-hw-decoder__ul_s4v_vgh_fdc" data-ofbid="lvgl-hw-decoder__ul_s4v_vgh_fdc"><li class="- topic/li li" data-ofbid="d330668e122__20250121171832">宏定义 LV_IMG_CACHE_DEF_SIZE 为 1 表示打开图片缓冲机制。</li><li class="- topic/li li" data-ofbid="d330668e124__20250121171832">宏定义 LV_IMG_CACHE_DEF_SIZE 为 0 表示关闭图片缓冲机制。</li></ul></div>
</li><li class="- topic/li li" data-ofbid="d330668e127__20250121171832"><strong class="+ topic/ph hi-d/b ph b">设置缓存的图片张数</strong><p class="- topic/p p" data-ofbid="d330668e130__20250121171832">通过 void lv_img_cache_set_size(uint16_t entry_cnt)
来设置缓冲的图片张数</p><p class="- topic/p p" data-ofbid="d330668e132__20250121171832">图以张数为单位进行缓存。例如，设置缓存的图片张数为 10。</p></li><li class="- topic/li li" data-ofbid="d330668e134__20250121171832"><strong class="+ topic/ph hi-d/b ph b"> 图片缓存价值判断</strong><p class="- topic/p p" data-ofbid="d330668e137__20250121171832">当图片缓存到设置的最大张数时，如果需要新的缓存，图片缓存机制内部会进行图片缓存价值的判断。
例如，某张图片解码的时间比较久或使用频繁高，则其缓存价值打分会更高，需要优先缓存这类图片。</p></li></ol></li></ol></div><div class="table-container"><table class="- topic/table table frame-all" id="lvgl-hw-decoder__table_l1h_1zf_fdc" data-ofbid="lvgl-hw-decoder__table_l1h_1zf_fdc" 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/keyword pr-d/apiname keyword apiname">lv_img_decoder_t</span> 注册接口说明</span></caption><colgroup><col style="width:37.453183520599254%"/><col style="width:62.546816479400746%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="lvgl-hw-decoder__table_l1h_1zf_fdc__entry__1">函数</th><th class="- topic/entry entry colsep-0 rowsep-1" id="lvgl-hw-decoder__table_l1h_1zf_fdc__entry__2">说明</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="lvgl-hw-decoder__table_l1h_1zf_fdc__entry__1">aic_decoder_info</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="lvgl-hw-decoder__table_l1h_1zf_fdc__entry__2">获取图片宽、高、图片格式信息</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="lvgl-hw-decoder__table_l1h_1zf_fdc__entry__1">aic_decoder_open</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="lvgl-hw-decoder__table_l1h_1zf_fdc__entry__2">申请解码输出 buffer，硬件解码输出</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="lvgl-hw-decoder__table_l1h_1zf_fdc__entry__1">aic_decoder_close</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="lvgl-hw-decoder__table_l1h_1zf_fdc__entry__2">释放硬件解码资源（包括输出 buffer）</td></tr></tbody></table></div></div></article></main></div>
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