lv_draw_label_private.h

API reference for lv_draw_label_private.h

Summary

Store some info to speed up drawing of very large texts It takes a lot of time to get the first visible character because all the previous characters needs to be checked to calculate the positions. This structure stores an earlier (e.g. at -1000 px) coordinate and the index of that line. Therefore the calculations can start from here.

Member	Type	Description
`line_start`	`int32_t`	Index of the line at `y` coordinate
`y`	`int32_t`	Give the `y` coordinate of the first letter at `line start` index. Relative to the label's coordinates
`coord_y`	`int32_t`	The 'y1' coordinate of the label when the hint was saved. Used to invalidate the hint if the label has moved too much.

struct

_lv_draw_glyph_dsc_t

Member	Type	Description
`glyph_data`	`const void *`	Depends on `format` field, it could be image source or draw buf of bitmap or vector data.
`format`	`lv_font_glyph_format_t`
`letter_coords`	`const lv_area_t *`
`bg_coords`	`const lv_area_t *`
`g`	`lv_font_glyph_dsc_t *`
`color`	`lv_color_t`
`opa`	`lv_opa_t`
`outline_stroke_color`	`lv_color_t`
`outline_stroke_opa`	`lv_opa_t`
`outline_stroke_width`	`int32_t`
`rotation`	`int32_t`
`pivot`	`lv_point_t`	Rotation pivot point associated with total glyph including line_height
`_draw_buf`	`lv_draw_buf_t *`	a shared draw buf for get_bitmap, do not use it directly, use glyph_data instead

lv_draw_label_private.h

Structs

_lv_draw_label_hint_t

_lv_draw_glyph_dsc_t

Dependencies

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