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< div class = "date inPage" > 16 May 2025< / div > < div style = "color: gray;" >
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Read time: 1 minute(s)
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< p class = "- topic/p p" data-ofbid = "d189504e33__20250519091526" > 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 = "d189504e39__20250519091526" > 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 = "d189504e43__20250519091526" > 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()
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{
lv_img_decoder_t *aic_dec = lv_img_decoder_create();
< em class = "hl-comment" > /* init frame info lists */< / em >
mpp_list_init(& 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);
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}< / pre > < / li >
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< li class = "- topic/li li" data-ofbid = "d189504e48__20250519091526" > 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 = "d189504e54__20250519091526" > 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 = "d189504e60__20250519091526" > 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 = "d189504e66__20250519091526" > 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" >
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< 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" >
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< li class = "- topic/li li" data-ofbid = "d189504e84__20250519091526" >
< p class = "- topic/p p" data-ofbid = "d189504e86__20250519091526" > 采用此流程需要额外申请一块解码 buffer， < / p >
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< / li >
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< li class = "- topic/li li" data-ofbid = "d189504e90__20250519091526" >
< p class = "- topic/p p" data-ofbid = "d189504e92__20250519091526" > 缓存解码后的 buffer， ， ， < / p >
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< / li >
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< / ul > < p class = "- topic/p p" data-ofbid = "d189504e96__20250519091526" > 当绘制函数为 draw_img 时，硬件解码在函数 draw_img
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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" >
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< li class = "- topic/li li" data-ofbid = "d189504e111__20250519091526" >
< p class = "- topic/p p" data-ofbid = "d189504e113__20250519091526" > 采用此流程无需额外申请解码 buffer， < / p >
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< / li >
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< li class = "- topic/li li" data-ofbid = "d189504e117__20250519091526" >
< p class = "- topic/p p" data-ofbid = "d189504e119__20250519091526" > 当需要进行 alpha blending 的时候，此方法不可行< / p >
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< / li >
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< li class = "- topic/li li" data-ofbid = "d189504e123__20250519091526" >
< p class = "- topic/p p" data-ofbid = "d189504e125__20250519091526" > 每次都要重新对 image 解码，速度不如 draw_img_decoded< / p >
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< / li >
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< li class = "- topic/li li" data-ofbid = "d189504e129__20250519091526" >
< p class = "- topic/p p" data-ofbid = "d189504e131__20250519091526" > 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 >
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< / li >
< / ul > < / li >
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< li class = "- topic/li li" data-ofbid = "d189504e137__20250519091526" > 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 = "d189504e142__20250519091526" > 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 = "d189504e146__20250519091526" >
< p class = "- topic/p p" data-ofbid = "d189504e148__20250519091526" > < 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 = "d189504e152__20250519091526" > 在 < span class = "+ topic/ph sw-d/filepath ph filepath" > lv_conf.h< / span > 文件中，采用 lv_img_decoder_t
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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" >
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< li class = "- topic/li li" data-ofbid = "d189504e159__20250519091526" > 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 = "d189504e162__20250519091526" > 宏定义 LV_IMG_CACHE_DEF_SIZE 为 0 表示关闭图片缓冲机制。< / li >
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< / ul > < / div >
< / li >
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< li class = "- topic/li li" data-ofbid = "d189504e167__20250519091526" > < 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 = "d189504e170__20250519091526" > 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 = "d189504e172__20250519091526" > 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 = "d189504e175__20250519091526" > < 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 = "d189504e178__20250519091526" > 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。
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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" >
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< th class = "- topic/entry entry colsep-1 rowsep-1" id = "lvgl-hw-decoder__table_l1h_1zf_fdc__entry__1" > < p class = "- topic/p p" data-ofbid = "d189504e201__20250519091526" > 函数< / p > < / th >
< th class = "- topic/entry entry colsep-0 rowsep-1" id = "lvgl-hw-decoder__table_l1h_1zf_fdc__entry__2" > < p class = "- topic/p p" data-ofbid = "d189504e205__20250519091526" > 说明< / p > < / th >
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< / tr >
< / thead > < tbody class = "- topic/tbody tbody" >
< tr class = "- topic/row" >
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< td class = "- topic/entry entry colsep-1 rowsep-1" headers = "lvgl-hw-decoder__table_l1h_1zf_fdc__entry__1" > < p class = "- topic/p p" data-ofbid = "d189504e215__20250519091526" > aic_decoder_info< / p > < / td >
< td class = "- topic/entry entry colsep-0 rowsep-1" headers = "lvgl-hw-decoder__table_l1h_1zf_fdc__entry__2" > < p class = "- topic/p p" data-ofbid = "d189504e219__20250519091526" > 获取图片宽、高、图片格式信息< / p > < / td >
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< / tr >
< tr class = "- topic/row" >
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< td class = "- topic/entry entry colsep-1 rowsep-1" headers = "lvgl-hw-decoder__table_l1h_1zf_fdc__entry__1" > < p class = "- topic/p p" data-ofbid = "d189504e226__20250519091526" > aic_decoder_open< / p > < / td >
< td class = "- topic/entry entry colsep-0 rowsep-1" headers = "lvgl-hw-decoder__table_l1h_1zf_fdc__entry__2" > < p class = "- topic/p p" data-ofbid = "d189504e230__20250519091526" > 申请解码输出 buffer， < / p > < / td >
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< / tr >
< tr class = "- topic/row" >
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< td class = "- topic/entry entry colsep-1 rowsep-0" headers = "lvgl-hw-decoder__table_l1h_1zf_fdc__entry__1" > < p class = "- topic/p p" data-ofbid = "d189504e237__20250519091526" > aic_decoder_close< / p > < / td >
< td class = "- topic/entry entry colsep-0 rowsep-0" headers = "lvgl-hw-decoder__table_l1h_1zf_fdc__entry__2" > < p class = "- topic/p p" data-ofbid = "d189504e241__20250519091526" > 释放硬件解码资源（包括输出 buffer） < / p > < / td >
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< / tr >
< / tbody > < / table > < / div >
< / div >
< / article > < / main > < / div >
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< / div >
< / div >
< / div >
< / div >
< footer class = "navbar navbar-default wh_footer" >
< div class = " footer-container mx-auto " >
< title > footer def< / title >
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< style >
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.p1 {
font-family: FangZhengShuSong, Times, serif;
}
.p2 {
font-family: Arial, Helvetica, sans-serif;
}
.p3 {
font-family: "Lucida Console", "Courier New", monospace;
}
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< / style >
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< div class = "webhelp.fragment.footer" >
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< p class = "p1" > Copyright © 2019-2025 广东匠芯创科技有限公司. All rights reserved.< / p >
< / div >
< div >
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< div class = "generation_time" >
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Update Time: 2025-05-19
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< / div >
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< / div >
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< / div >
< / footer >
< div id = "go2top" class = "d-print-none" >
< span class = "oxy-icon oxy-icon-up" > < / span >
< / div >
< div id = "modal_img_large" class = "modal" >
< span class = "close oxy-icon oxy-icon-remove" > < / span >
< div id = "modal_img_container" > < / div >
< div id = "caption" > < / div >
< / div >
< script src = "${pd}/publishing/publishing-styles-AIC-template/js/custom.js" defer = "defer" > < / script >
< / body >
< / html >
