lv_draw_image.h
Typedefs
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typedef struct _lv_draw_image_dsc_t lv_draw_image_dsc_t
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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
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void lv_draw_image_dsc_init(lv_draw_image_dsc_t *dsc)
Initialize an image draw descriptor.
- 参数:
dsc -- pointer to a draw descriptor
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lv_draw_image_dsc_t *lv_draw_task_get_image_dsc(lv_draw_task_t *task)
Try to get an image draw descriptor from a draw task.
- 参数:
task -- draw task
- 返回:
the task's draw descriptor or NULL if the task is not of type LV_DRAW_TASK_TYPE_IMAGE
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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
备注
coordscan be small than the real image area (if only a part of the image is rendered) or can be larger (in case of tiled images). .- 参数:
layer -- pointer to a layer
dsc -- pointer to an initialized draw descriptor
coords -- the coordinates of the image
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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 another layer
备注
coordscan be small than the total widget area from which the layer is created (if only a part of the widget was rendered to a layer)- 参数:
layer -- pointer to a layer
dsc -- pointer to an initialized draw descriptor
coords -- the coordinates of the layer.
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lv_image_src_t lv_image_src_get_type(const void *src)
Get the type of an image source
- 参数:
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)
- 返回:
type of the image source LV_IMAGE_SRC_VARIABLE/FILE/SYMBOL/UNKNOWN
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struct _lv_draw_image_dsc_t
Public Members
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lv_draw_dsc_base_t base
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const void *src
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lv_image_header_t header
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int32_t rotation
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int32_t scale_x
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int32_t scale_y
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int32_t skew_x
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int32_t skew_y
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lv_point_t pivot
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lv_color_t recolor
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lv_blend_mode_t blend_mode
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uint16_t antialias
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uint16_t tile
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lv_draw_image_sup_t *sup
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lv_area_t image_area
Used to indicate the entire original, non-clipped area where the image is to be drawn. This is important for:
Layer rendering, where it might happen that only a smaller area of the layer is rendered.
Tiled images, where the target draw area is larger than the image to be tiled.
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int32_t clip_radius
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const lv_image_dsc_t *bitmap_mask_src
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lv_draw_dsc_base_t base