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310 lines
8.6 KiB
310 lines
8.6 KiB
/**
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* @file lv_font.h
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*
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*/
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#ifndef LV_FONT_H
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#define LV_FONT_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_conf_internal.h"
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#include <stdint.h>
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#include <stddef.h>
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#include <stdbool.h>
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#include "lv_symbol_def.h"
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#include "../draw/lv_draw_buf.h"
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#include "../misc/lv_area.h"
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#include "../misc/lv_types.h"
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#include "../misc/cache/lv_cache.h"
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/*********************
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* DEFINES
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*********************/
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/**********************
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* TYPEDEFS
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**********************/
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/*------------------
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* General types
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*-----------------*/
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/** The font format.*/
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enum _lv_font_glyph_format_t {
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LV_FONT_GLYPH_FORMAT_NONE = 0, /**< Maybe not visible*/
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/**< Legacy simple formats*/
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LV_FONT_GLYPH_FORMAT_A1 = 0x01, /**< 1 bit per pixel*/
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LV_FONT_GLYPH_FORMAT_A2 = 0x02, /**< 2 bit per pixel*/
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LV_FONT_GLYPH_FORMAT_A4 = 0x04, /**< 4 bit per pixel*/
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LV_FONT_GLYPH_FORMAT_A8 = 0x08, /**< 8 bit per pixel*/
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LV_FONT_GLYPH_FORMAT_IMAGE = 0x09, /**< Image format*/
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/**< Advanced formats*/
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LV_FONT_GLYPH_FORMAT_VECTOR = 0x0A, /**< Vectorial format*/
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LV_FONT_GLYPH_FORMAT_SVG = 0x0B, /**< SVG format*/
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LV_FONT_GLYPH_FORMAT_CUSTOM = 0xFF, /**< Custom format*/
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};
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#ifdef DOXYGEN
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typedef _lv_font_glyph_format_t lv_font_glyph_format_t;
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#else
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typedef uint8_t lv_font_glyph_format_t;
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#endif /*DOXYGEN*/
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/** Describes the properties of a glyph.*/
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typedef struct {
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const lv_font_t *
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resolved_font; /**< Pointer to a font where the glyph was actually found after handling fallbacks*/
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uint16_t adv_w; /**< The glyph needs this space. Draw the next glyph after this width.*/
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uint16_t box_w; /**< Width of the glyph's bounding box*/
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uint16_t box_h; /**< Height of the glyph's bounding box*/
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int16_t ofs_x; /**< x offset of the bounding box*/
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int16_t ofs_y; /**< y offset of the bounding box*/
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lv_font_glyph_format_t format; /**< Font format of the glyph see @lv_font_glyph_format_t*/
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uint8_t is_placeholder: 1; /**< Glyph is missing. But placeholder will still be displayed*/
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uint32_t glyph_index; /**< The index of the glyph in the font file. Used by the font cache*/
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lv_cache_entry_t * entry; /**< The cache entry of the glyph draw data. Used by the font cache*/
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} lv_font_glyph_dsc_t;
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/** The bitmaps might be upscaled by 3 to achieve subpixel rendering.*/
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enum _lv_font_subpx_t {
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LV_FONT_SUBPX_NONE,
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LV_FONT_SUBPX_HOR,
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LV_FONT_SUBPX_VER,
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LV_FONT_SUBPX_BOTH,
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};
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#ifdef DOXYGEN
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typedef _lv_font_subpx_t lv_font_subpx_t;
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#else
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typedef uint8_t lv_font_subpx_t;
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#endif /*DOXYGEN*/
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/** Adjust letter spacing for specific character pairs.*/
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enum _lv_font_kerning_t {
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LV_FONT_KERNING_NORMAL,
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LV_FONT_KERNING_NONE,
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};
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#ifdef DOXYGEN
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typedef _lv_font_kerning_t lv_font_kerning_t;
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#else
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typedef uint8_t lv_font_kerning_t;
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#endif /*DOXYGEN*/
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/** Describe the properties of a font*/
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struct _lv_font_t {
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/** Get a glyph's descriptor from a font*/
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bool (*get_glyph_dsc)(const lv_font_t *, lv_font_glyph_dsc_t *, uint32_t letter, uint32_t letter_next);
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/** Get a glyph's bitmap from a font*/
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const void * (*get_glyph_bitmap)(lv_font_glyph_dsc_t *, uint32_t, lv_draw_buf_t *);
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/** Release a glyph*/
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void (*release_glyph)(const lv_font_t *, lv_font_glyph_dsc_t *);
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/*Pointer to the font in a font pack (must have the same line height)*/
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int32_t line_height; /**< The real line height where any text fits*/
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int32_t base_line; /**< Base line measured from the top of the line_height*/
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uint8_t subpx : 2; /**< An element of `lv_font_subpx_t`*/
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uint8_t kerning : 1; /**< An element of `lv_font_kerning_t`*/
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int8_t underline_position; /**< Distance between the top of the underline and base line (< 0 means below the base line)*/
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int8_t underline_thickness; /**< Thickness of the underline*/
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const void * dsc; /**< Store implementation specific or run_time data or caching here*/
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const lv_font_t * fallback; /**< Fallback font for missing glyph. Resolved recursively */
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void * user_data; /**< Custom user data for font.*/
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};
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/**********************
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* GLOBAL PROTOTYPES
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**********************/
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/**
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* Return with the bitmap of a font.
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* @param g_dsc the glyph descriptor including which font to use etc.
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* @param letter a UNICODE character code
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* @param draw_buf a draw buffer that can be used to store the bitmap of the glyph, it's OK not to use it.
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* @return pointer to the glyph's data. It can be a draw buffer for bitmap fonts or an image source for imgfonts.
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*/
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const void * lv_font_get_glyph_bitmap(lv_font_glyph_dsc_t * g_dsc, uint32_t letter,
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lv_draw_buf_t * draw_buf);
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/**
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* Get the descriptor of a glyph
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* @param font pointer to font
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* @param dsc_out store the result descriptor here
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* @param letter a UNICODE letter code
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* @param letter_next the next letter after `letter`. Used for kerning
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* @return true: descriptor is successfully loaded into `dsc_out`.
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* false: the letter was not found, no data is loaded to `dsc_out`
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*/
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bool lv_font_get_glyph_dsc(const lv_font_t * font, lv_font_glyph_dsc_t * dsc_out, uint32_t letter,
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uint32_t letter_next);
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/**
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* Get the width of a glyph with kerning
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* @param font pointer to a font
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* @param letter a UNICODE letter
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* @param letter_next the next letter after `letter`. Used for kerning
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* @return the width of the glyph
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*/
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uint16_t lv_font_get_glyph_width(const lv_font_t * font, uint32_t letter, uint32_t letter_next);
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/**
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* Get the line height of a font. All characters fit into this height
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* @param font pointer to a font
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* @return the height of a font
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*/
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static inline int32_t lv_font_get_line_height(const lv_font_t * font)
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{
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return font->line_height;
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}
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/**
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* Configure the use of kerning information stored in a font
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* @param font pointer to a font
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* @param kerning `LV_FONT_KERNING_NORMAL` (default) or `LV_FONT_KERNING_NONE`
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*/
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void lv_font_set_kerning(lv_font_t * font, lv_font_kerning_t kerning);
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/**********************
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* MACROS
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**********************/
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#define LV_FONT_DECLARE(font_name) LV_ATTRIBUTE_EXTERN_DATA extern const lv_font_t font_name;
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#if LV_FONT_MONTSERRAT_8
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LV_FONT_DECLARE(lv_font_montserrat_8)
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#endif
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#if LV_FONT_MONTSERRAT_10
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LV_FONT_DECLARE(lv_font_montserrat_10)
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#endif
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#if LV_FONT_MONTSERRAT_12
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LV_FONT_DECLARE(lv_font_montserrat_12)
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#endif
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#if LV_FONT_MONTSERRAT_14
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LV_FONT_DECLARE(lv_font_montserrat_14)
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#endif
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#if LV_FONT_MONTSERRAT_16
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LV_FONT_DECLARE(lv_font_montserrat_16)
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#endif
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#if LV_FONT_MONTSERRAT_18
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LV_FONT_DECLARE(lv_font_montserrat_18)
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#endif
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#if LV_FONT_MONTSERRAT_20
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LV_FONT_DECLARE(lv_font_montserrat_20)
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#endif
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#if LV_FONT_MONTSERRAT_22
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LV_FONT_DECLARE(lv_font_montserrat_22)
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#endif
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#if LV_FONT_MONTSERRAT_24
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LV_FONT_DECLARE(lv_font_montserrat_24)
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#endif
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#if LV_FONT_MONTSERRAT_26
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LV_FONT_DECLARE(lv_font_montserrat_26)
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#endif
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#if LV_FONT_MONTSERRAT_28
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LV_FONT_DECLARE(lv_font_montserrat_28)
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#endif
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#if LV_FONT_MONTSERRAT_30
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LV_FONT_DECLARE(lv_font_montserrat_30)
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#endif
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#if LV_FONT_MONTSERRAT_32
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LV_FONT_DECLARE(lv_font_montserrat_32)
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#endif
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#if LV_FONT_MONTSERRAT_34
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LV_FONT_DECLARE(lv_font_montserrat_34)
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#endif
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#if LV_FONT_MONTSERRAT_36
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LV_FONT_DECLARE(lv_font_montserrat_36)
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#endif
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#if LV_FONT_MONTSERRAT_38
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LV_FONT_DECLARE(lv_font_montserrat_38)
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#endif
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#if LV_FONT_MONTSERRAT_40
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LV_FONT_DECLARE(lv_font_montserrat_40)
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#endif
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#if LV_FONT_MONTSERRAT_42
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LV_FONT_DECLARE(lv_font_montserrat_42)
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#endif
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#if LV_FONT_MONTSERRAT_44
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LV_FONT_DECLARE(lv_font_montserrat_44)
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#endif
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#if LV_FONT_MONTSERRAT_46
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LV_FONT_DECLARE(lv_font_montserrat_46)
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#endif
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#if LV_FONT_MONTSERRAT_48
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LV_FONT_DECLARE(lv_font_montserrat_48)
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#endif
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#if LV_FONT_MONTSERRAT_28_COMPRESSED
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LV_FONT_DECLARE(lv_font_montserrat_28_compressed)
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#endif
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#if LV_FONT_DEJAVU_16_PERSIAN_HEBREW
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LV_FONT_DECLARE(lv_font_dejavu_16_persian_hebrew)
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#endif
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#if LV_FONT_SIMSUN_16_CJK
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LV_FONT_DECLARE(lv_font_simsun_16_cjk)
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#endif
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#if LV_FONT_UNSCII_8
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LV_FONT_DECLARE(lv_font_unscii_8)
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#endif
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#if LV_FONT_UNSCII_16
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LV_FONT_DECLARE(lv_font_unscii_16)
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#endif
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/*Declare the custom (user defined) fonts*/
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#ifdef LV_FONT_CUSTOM_DECLARE
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LV_FONT_CUSTOM_DECLARE
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#endif
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/**
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* Just a wrapper around LV_FONT_DEFAULT because it might be more convenient to use a function in some cases
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* @return pointer to LV_FONT_DEFAULT
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*/
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static inline const lv_font_t * lv_font_default(void)
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{
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return LV_FONT_DEFAULT;
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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 /*USE_FONT*/
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