「App:Library:LVGL:docs:3rd party libraries:BMP decoder」の版間の差分
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| + | = BMP decoder = | ||
| + | This extension allows the use of BMP images in LVGL. This implementation uses bmp-decoder library. The pixels are read on demand (not the whole image is loaded) so using BMP images requires very little RAM. | ||
| + | |||
| + | If enabled in <code>lv_conf.h</code> by <code>LV_USE_BMP</code> LVGL will register a new image decoder automatically so BMP files can be directly used as image sources. For example: | ||
| + | lv_img_set_src(my_img, "S:path/to/picture.bmp"); | ||
| + | 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> | ||
| + | |||
| + | == Limitations == | ||
| + | |||
| + | * Only BMP files are supported and BMP images as C array (<code>lv_img_dsc_t</code>) are not. It's because there is no practical differences between how the BMP files and LVGL's image format stores the image data. | ||
| + | * BMP files can be loaded only from file. If you want to store them in flash it's better to convert them to C array with LVGL's image converter. | ||
| + | * The BMP files color format needs to match with <code>LV_COLOR_DEPTH</code>. Use GIMP to save the image in the required format. Both RGB888 and ARGB888 works with <code>LV_COLOR_DEPTH 32</code> | ||
| + | * Palette is not supported. | ||
| + | * Because not the whole image is read in can not be zoomed or rotated. | ||
| + | |||
| + | == Example == | ||
| + | |||
| + | === Open a BMP image from file === | ||
| + | [[ファイル:LVGL docs others gridnav 03.png|サムネイル]] | ||
| + | |||
| + | |||
| + | https://docs.lvgl.io/8.2/libs/bmp.html#open-a-bmp-image-from-file | ||
| + | |||
| + | ---- | ||
| + | |||
| + | == API == | ||
| + | Functions | ||
| + | |||
| + | ; <span id="_CPPv311lv_bmp_initv"></span><span id="_CPPv211lv_bmp_initv"></span><span id="lv_bmp_init__void"></span><span id="lv__bmp_8h_1a840775046f734a65dfeaca9d4a606154" class="target"></span>void lv_bmp_init(void) | ||
| + | |||
2022年6月28日 (火) 13:01時点における版
https://docs.lvgl.io/8.2/libs/bmp.html
| 英文 | 自動翻訳 |
|---|---|
BMP decoder
This extension allows the use of BMP images in LVGL. This implementation uses bmp-decoder library. The pixels are read on demand (not the whole image is loaded) so using BMP images requires very little RAM.
If enabled in lv_conf.h by LV_USE_BMP LVGL will register a new image decoder automatically so BMP files can be directly used as image sources. For example:
lv_img_set_src(my_img, "S:path/to/picture.bmp");
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_...
Limitations
- Only BMP files are supported and BMP images as C array (
lv_img_dsc_t) are not. It's because there is no practical differences between how the BMP files and LVGL's image format stores the image data. - BMP files can be loaded only from file. If you want to store them in flash it's better to convert them to C array with LVGL's image converter.
- The BMP files color format needs to match with
LV_COLOR_DEPTH. Use GIMP to save the image in the required format. Both RGB888 and ARGB888 works withLV_COLOR_DEPTH 32 - Palette is not supported.
- Because not the whole image is read in can not be zoomed or rotated.
Example
Open a BMP image from file
https://docs.lvgl.io/8.2/libs/bmp.html#open-a-bmp-image-from-file
API
Functions
- void lv_bmp_init(void)
