「App:Library:LVGL:docs:3rd party libraries:PNG decoder」の版間の差分
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| + | = PNG decoder = | ||
| + | Allow the use of PNG images in LVGL. This implementation uses lodepng library. | ||
| + | |||
| + | If enabled in <code>lv_conf.h</code> by <code>LV_USE_PNG</code> LVGL will register a new image decoder automatically so PNG files can be directly used as any other image sources. | ||
| + | |||
| + | Note that, a file system driver needs to registered to open images from files. Read more about it here or just enable one in <code>lv_conf.h</code> with <code>LV_USE_FS_...</code> | ||
| + | |||
| + | The whole PNG image is decoded so during decoding RAM equals to <code>image width x image height x 4</code> bytes are required. | ||
| + | |||
| + | As it might take significant time to decode PNG images LVGL's images caching feature can be useful. | ||
| + | |||
| + | == Example == | ||
| + | |||
| + | === Open a PNG image from file and variable === | ||
| + | [[ファイル:LVGL docs 3rdPartyLibs PNGdecoder 01.png|サムネイル]] | ||
| + | |||
| + | |||
| + | https://docs.lvgl.io/8.2/libs/png.html#open-a-png-image-from-file-and-variable | ||
| + | |||
| + | ---- | ||
| + | |||
| + | == API == | ||
| + | Functions | ||
| + | |||
| + | ; <span id="_CPPv311lv_png_initv"></span><span id="_CPPv211lv_png_initv"></span><span id="lv_png_init__void"></span><span id="lv__png_8h_1adc5d316c551d60f37084dd40b1aaec18" class="target"></span>void lv_png_init(void)[https://docs.lvgl.io/8.2/libs/png.html#_CPPv411lv_png_initv] <span id="_CPPv311lv_png_initv"></span><span id="_CPPv211lv_png_initv"></span><span id="lv_png_init__void"></span><span id="lv__png_8h_1adc5d316c551d60f37084dd40b1aaec18" class="target"></span> | ||
| + | : Register the PNG d[https://docs.lvgl.io/8.2/libs/png.html#_CPPv411lv_png_initv]ecoder functions in LVGL | ||
| + | |||
2022年6月28日 (火) 12:59時点における版
https://docs.lvgl.io/8.2/libs/png.html
| 英文 | 自動翻訳 |
|---|---|
PNG decoder
Allow the use of PNG images in LVGL. This implementation uses lodepng library.
If enabled in lv_conf.h by LV_USE_PNG LVGL will register a new image decoder automatically so PNG files can be directly used as any other image sources.
Note that, a file system driver needs to registered to open images from files. Read more about it here or just enable one in lv_conf.h with LV_USE_FS_...
The whole PNG image is decoded so during decoding RAM equals to image width x image height x 4 bytes are required.
As it might take significant time to decode PNG images LVGL's images caching feature can be useful.
Example
Open a PNG image from file and variable
https://docs.lvgl.io/8.2/libs/png.html#open-a-png-image-from-file-and-variable
API
Functions
