Display large image with small size object

General discussion
1

I’m displaying 960 x 3256 image with object of size 220 x 175. It displaying only some part of the image even scroll to horizontal and vertical.

    lv_obj_t *img_box = lv_obj_create(drive->drive_obj);
    lv_obj_set_pos(img_box, 235, 45);
    lv_obj_set_size(img_box, 220, 175);
    lv_obj_add_flag(img_box, LV_OBJ_FLAG_SCROLLABLE);

    lv_obj_t *img = lv_img_create(img_box);
    lv_img_set_src(img, "S:/usb/image.bmp");
    lv_img_set_offset_x(img, 0);
    lv_img_set_offset_y(img, 0);
    lv_obj_align(img, LV_ALIGN_CENTER, 0, 0);

How to display complete image with scroll support.

2

At this moment LVGL supports only max 2047*2047 images. :frowning:

3

Understood. But it start displaying preview at middle of image. Not displaying from start.

4

If the image is larger then 2047x2047 the behavior is undefined.

5

Is it possible to increase maximum pixel support greater than 2048 ?
If Yes, could you please share location where need this modification.
We need support up to 4000 pixels.

6

You can manually edit lv_img_dsc_t like:

typedef struct {

    uint32_t cf : 5;          /*Color format: See `lv_img_color_format_t`*/
    uint32_t always_zero : 3; /*It the upper bits of the first byte. Always zero to look like a
                                 non-printable character*/

    uint32_t w : 12; /*Width of the image map*/
    uint32_t h : 12; /*Height of the image map*/
} lv_img_header_t;

In v9 we will support larger images too.

7

What is the size of the original photo?

8

1024 x 1024

9

can i use compress foto for make it smaller?