168 lines
6.1 KiB
C
168 lines
6.1 KiB
C
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/**
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* @file lv_draw_img.h
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*
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*/
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#ifndef LV_DRAW_IMG_H
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#define LV_DRAW_IMG_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*********************
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* INCLUDES
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*********************/
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#include "lv_draw.h"
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#include "../lv_core/lv_obj.h"
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/*********************
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* DEFINES
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*********************/
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#define LV_IMG_DECODER_OPEN_FAIL ((void*)(-1))
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/**********************
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* TYPEDEFS
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**********************/
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struct _lv_img_t;
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typedef struct {
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/* The first 8 bit is very important to distinguish the different source types.
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* For more info see `lv_img_get_src_type()` in lv_img.c */
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uint32_t cf :5; /* Color format: See `lv_img_color_format_t`*/
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uint32_t always_zero :3; /*It the upper bits of the first byte. Always zero to look like a non-printable character*/
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uint32_t reserved :2; /*Reserved to be used later*/
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uint32_t w:11; /*Width of the image map*/
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uint32_t h:11; /*Height of the image map*/
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} lv_img_header_t;
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/*Image color format*/
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enum {
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LV_IMG_CF_UNKOWN = 0,
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LV_IMG_CF_RAW, /*Contains the file as it is. Needs custom decoder function*/
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LV_IMG_CF_RAW_ALPHA, /*Contains the file as it is. The image has alpha. Needs custom decoder function*/
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LV_IMG_CF_RAW_CHROMA_KEYED, /*Contains the file as it is. The image is chroma keyed. Needs custom decoder function*/
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LV_IMG_CF_TRUE_COLOR, /*Color format and depth should match with LV_COLOR settings*/
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LV_IMG_CF_TRUE_COLOR_ALPHA, /*Same as `LV_IMG_CF_TRUE_COLOR` but every pixel has an alpha byte*/
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LV_IMG_CF_TRUE_COLOR_CHROMA_KEYED, /*Same as `LV_IMG_CF_TRUE_COLOR` but LV_COLOR_TRANSP pixels will be transparent*/
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LV_IMG_CF_INDEXED_1BIT, /*Can have 2 different colors in a palette (always chroma keyed)*/
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LV_IMG_CF_INDEXED_2BIT, /*Can have 4 different colors in a palette (always chroma keyed)*/
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LV_IMG_CF_INDEXED_4BIT, /*Can have 16 different colors in a palette (always chroma keyed)*/
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LV_IMG_CF_INDEXED_8BIT, /*Can have 256 different colors in a palette (always chroma keyed)*/
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LV_IMG_CF_ALPHA_1BIT, /*Can have one color and it can be drawn or not*/
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LV_IMG_CF_ALPHA_2BIT, /*Can have one color but 4 different alpha value*/
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LV_IMG_CF_ALPHA_4BIT, /*Can have one color but 16 different alpha value*/
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LV_IMG_CF_ALPHA_8BIT, /*Can have one color but 256 different alpha value*/
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};
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typedef uint8_t lv_img_cf_t;
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/* Image header it is compatible with
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* the result image converter utility*/
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typedef struct
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{
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lv_img_header_t header;
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uint32_t data_size;
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const uint8_t * data;
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} lv_img_dsc_t;
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/* Decoder function definitions */
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/**
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* Get info from an image and store in the `header`
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* @param src the image source. Can be a pointer to a C array or a file name (Use `lv_img_src_get_type` to determine the type)
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* @param header store the info here
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* @return LV_RES_OK: info written correctly; LV_RES_INV: failed
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*/
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typedef lv_res_t (*lv_img_decoder_info_f_t)(const void * src, lv_img_header_t * header);
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/**
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* Open an image for decoding. Prepare it as it is required to read it later
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* @param src the image source. Can be a pointer to a C array or a file name (Use `lv_img_src_get_type` to determine the type)
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* @param style the style of image (maybe it will be required to determine a color or something)
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* @return there are 3 possible return values:
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* 1) buffer with the decoded image
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* 2) if can decode the whole image NULL. decoder_read_line will be called to read the image line-by-line
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* 3) LV_IMG_DECODER_OPEN_FAIL if the image format is unknown to the decoder or an error occurred
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*/
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typedef const uint8_t * (*lv_img_decoder_open_f_t)(const void * src, const lv_style_t * style);
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/**
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* Decode `len` pixels starting from the given `x`, `y` coordinates and store them in `buf`.
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* Required only if the "open" function can't return with the whole decoded pixel array.
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* @param x start x coordinate
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* @param y startt y coordinate
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* @param len number of pixels to decode
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* @param buf a buffer to store the decoded pixels
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* @return LV_RES_OK: ok; LV_RES_INV: failed
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*/
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typedef lv_res_t (*lv_img_decoder_read_line_f_t)(lv_coord_t x, lv_coord_t y, lv_coord_t len, uint8_t * buf);
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/**
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* Close the pending decoding. Free resources etc.
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*/
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typedef void (*lv_img_decoder_close_f_t)(void);
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/**********************
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* GLOBAL PROTOTYPES
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**********************/
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/**
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* Draw an image
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* @param coords the coordinates of the image
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* @param mask the image will be drawn only in this area
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* @param src pointer to a lv_color_t array which contains the pixels of the image
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* @param style style of the image
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* @param opa_scale scale down all opacities by the factor
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*/
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void lv_draw_img(const lv_area_t * coords, const lv_area_t * mask,
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const void * src, const lv_style_t * style, lv_opa_t opa_scale);
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/**
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* Get the type of an image source
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* @param src pointer to an image source:
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* - pointer to an 'lv_img_t' variable (image stored internally and compiled into the code)
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* - a path to a file (e.g. "S:/folder/image.bin")
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* - or a symbol (e.g. SYMBOL_CLOSE)
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* @return type of the image source LV_IMG_SRC_VARIABLE/FILE/SYMBOL/UNKOWN
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*/
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lv_img_src_t lv_img_src_get_type(const void * src);
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/**
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* Set custom decoder functions. See the typdefs of the function typed above for more info about them
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* @param info_fp info get function
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* @param open_fp open function
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* @param read_fp read line function
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* @param close_fp clode function
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*/
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void lv_img_decoder_set_custom(lv_img_decoder_info_f_t info_fp, lv_img_decoder_open_f_t open_fp,
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lv_img_decoder_read_line_f_t read_fp, lv_img_decoder_close_f_t close_fp);
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lv_res_t lv_img_dsc_get_info(const char * src, lv_img_header_t * header);
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uint8_t lv_img_color_format_get_px_size(lv_img_cf_t cf);
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bool lv_img_color_format_is_chroma_keyed(lv_img_cf_t cf);
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bool lv_img_color_format_has_alpha(lv_img_cf_t cf);
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/**********************
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* MACROS
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**********************/
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#ifdef __cplusplus
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} /* extern "C" */
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#endif
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#endif /*LV_TEMPL_H*/
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