lv_draw_image.h

Typedefs

typedef struct _lv_draw_image_dsc_t lv_draw_image_dsc_t
typedef void (*lv_draw_image_core_cb)(lv_draw_unit_t *draw_unit, const lv_draw_image_dsc_t *draw_dsc, const lv_image_decoder_dsc_t *decoder_dsc, lv_draw_image_sup_t *sup, const lv_area_t *img_coords, const lv_area_t *clipped_img_area)

PErform the actual rendering of a decoded image

Param draw_unit:

pointer to a draw unit

Param draw_dsc:

the draw descriptor of the image

Param decoder_dsc:

pointer to the decoded image's descriptor

Param sup:

supplementary data

Param img_coords:

the absolute coordinates of the image

Param clipped_img_area:

the absolute clip coordinates

Functions

void lv_draw_image_dsc_init(lv_draw_image_dsc_t *dsc)

Initialize an image draw descriptor.

Parameters:

dsc -- pointer to a draw descriptor

void lv_draw_image(lv_layer_t *layer, const lv_draw_image_dsc_t *dsc, const lv_area_t *coords)

Create an image draw task

Parameters:

  • layer -- pointer to a layer

  • dsc -- pointer to an initialized draw descriptor

  • coords -- the coordinates of the image

void lv_draw_layer(lv_layer_t *layer, const lv_draw_image_dsc_t *dsc, const lv_area_t *coords)

Create a draw task to blend a layer to an other layer

Parameters:

  • layer -- pointer to a layer

  • dsc -- pointer to an initialized draw descriptor

  • coords -- the coordinates of the layer

lv_image_src_t lv_image_src_get_type(const void *src)

Get the type of an image source

Parameters:

src -- pointer to an image source:

  • pointer to an 'lv_image_t' variable (image stored internally and compiled into the code)

  • a path to a file (e.g. "S:/folder/image.bin")

  • or a symbol (e.g. LV_SYMBOL_CLOSE)

Returns:

type of the image source LV_IMAGE_SRC_VARIABLE/FILE/SYMBOL/UNKNOWN

void _lv_draw_image_normal_helper(lv_draw_unit_t *draw_unit, const lv_draw_image_dsc_t *draw_dsc, const lv_area_t *coords, lv_draw_image_core_cb draw_core_cb)

Can be used by draw units to handle the decoding and prepare everything for the actual image rendering

Parameters:

  • draw_unit -- pointer to a draw unit

  • draw_dsc -- the draw descriptor of the image

  • coords -- the absolute coordinates of the image

  • draw_core_cb -- a callback to perform the actual rendering

void _lv_draw_image_tiled_helper(lv_draw_unit_t *draw_unit, const lv_draw_image_dsc_t *draw_dsc, const lv_area_t *coords, lv_draw_image_core_cb draw_core_cb)

Can be used by draw units for TILED images to handle the decoding and prepare everything for the actual image rendering

Parameters:

  • draw_unit -- pointer to a draw unit

  • draw_dsc -- the draw descriptor of the image

  • coords -- the absolute coordinates of the image

  • draw_core_cb -- a callback to perform the actual rendering

struct lv_draw_image_sup_t

Public Members

lv_color_t alpha_color
const lv_color32_t *palette
uint32_t palette_size
struct _lv_draw_image_dsc_t

Public Members

lv_draw_dsc_base_t base
const void *src
lv_image_header_t header
int32_t rotation
int32_t scale_x
int32_t scale_y
int32_t skew_x
int32_t skew_y
lv_point_t pivot
lv_color_t recolor
lv_opa_t recolor_opa
lv_opa_t opa
lv_blend_mode_t blend_mode
uint16_t antialias
uint16_t tile
lv_draw_image_sup_t *sup