chore(image): remove not used frame_id para for decoder (#4933)

Signed-off-by: Xu Xingliang <xuxingliang@xiaomi.com>

docs/overview/img.rst

@@ -335,8 +335,7 @@ manually too. Create an :cpp:type:`lv_image_decoder_dsc_t` variable to describe
 the decoding session and call :cpp:func:`lv_image_decoder_open`.
 
 The ``color`` parameter is used only with ``LV_COLOR_FORMAT_A1/2/4/8``
-images to tell color of the image. ``frame_id`` can be used if the image
-to open is an animation.
+images to tell color of the image.
 
 .. code:: c
 

src/draw/lv_draw_image.h

@@ -53,7 +53,6 @@ typedef struct _lv_draw_image_dsc_t {
     lv_opa_t opa;
     lv_blend_mode_t blend_mode : 4;
 
-    int32_t frame_id;
     uint16_t antialias      : 1;
     uint16_t tile           : 1;
     lv_draw_image_sup_t * sup;

src/draw/lv_image_decoder.c

@@ -102,7 +102,6 @@ lv_result_t lv_image_decoder_open(lv_image_decoder_dsc_t * dsc, const void * src
     }
 
     dsc->src_type = src_type;
-    if(args) dsc->frame_id = args->frame_id;
 
     if(dsc->src_type == LV_IMAGE_SRC_FILE) {
         size_t fnlen = lv_strlen(src);

src/draw/lv_image_decoder.h

@@ -59,7 +59,6 @@ struct _lv_cache_entry_t;
  * all field are zero or false.
  */
 typedef struct _lv_image_decoder_args_t {
-    int32_t frame_id;       /*A not use args*/
     bool stride_align;      /*Whether stride should be aligned*/
     bool premultiply;       /*Whether image should be premultiplied or not after decoding*/
     bool no_cache;          /*Whether this image should be kept out of cache*/
@@ -127,9 +126,6 @@ typedef struct _lv_image_decoder_dsc_t {
     /**The image source. A file path like "S:my_img.png" or pointer to an `lv_image_dsc_t` variable*/
     const void * src;
 
-    /**Frame of the image, using with animated images*/
-    int32_t frame_id;
-
     /**Type of the source: file or variable. Can be set in `open` function if required*/
     lv_image_src_t src_type;