224 lines
7.8 KiB
C
224 lines
7.8 KiB
C
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#pragma once
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#ifndef __lvgl_H
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#define __lvgl_H
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#include "stdlib.h"
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#include "string.h"
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#include <stdio.h>
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#include <stdint.h>
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#include <stdbool.h>
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/* Attribute to mark large constant arrays for example
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* font's bitmaps */
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#define LV_ATTRIBUTE_LARGE_CONST
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/** Format of font character map. */
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enum {
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LV_FONT_FMT_TXT_CMAP_FORMAT0_TINY,
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LV_FONT_FMT_TXT_CMAP_FORMAT0_FULL,
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LV_FONT_FMT_TXT_CMAP_SPARSE_TINY,
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LV_FONT_FMT_TXT_CMAP_SPARSE_FULL,
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};
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typedef uint8_t lv_font_fmt_txt_cmap_type_t;
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typedef uint8_t lv_opa_t;
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/** This describes a glyph. */
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typedef struct {
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#if LV_FONT_FMT_TXT_LARGE == 0
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uint32_t bitmap_index: 20; /**< Start index of the bitmap. A font can be max 1 MB. */
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uint32_t adv_w: 12; /**< Draw the next glyph after this width. 8.4 format (real_value * 16 is stored). */
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uint8_t box_w; /**< Width of the glyph's bounding box*/
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uint8_t box_h; /**< Height of the glyph's bounding box*/
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int8_t ofs_x; /**< x offset of the bounding box*/
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int8_t ofs_y; /**< y offset of the bounding box. Measured from the top of the line*/
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#else
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uint32_t bitmap_index; /**< Start index of the bitmap. A font can be max 4 GB. */
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uint32_t adv_w; /**< Draw the next glyph after this width. 28.4 format (real_value * 16 is stored). */
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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. Measured from the top of the line*/
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#endif
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} lv_font_fmt_txt_glyph_dsc_t;
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/* 将码点映射到 `glyph_dsc` 的结构体
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* 支持多种格式以优化内存使用
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* 详见 https://github.com/lvgl/lv_font_conv/blob/master/doc/font_spec.md
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*/
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typedef struct {
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/** 此范围的第一个Unicode字符 */
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uint32_t range_start;
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/** 与此范围相关的Unicode字符数。
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* 最后一个Unicode字符 = range_start + range_length - 1*/
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uint16_t range_length;
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/** 此范围的第一个字形ID（`glyph_dsc` 的数组索引） */
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uint16_t glyph_id_start;
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/*
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根据规范，有4种格式：
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https://github.com/lvgl/lv_font_conv/blob/master/doc/font_spec.md
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为简单起见引入“相对码点”：
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rcp = codepoint - range_start
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和一个搜索函数：
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在“数组”中搜索“值”并返回“值”的索引。
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格式0 紧凑
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unicode_list == NULL && glyph_id_ofs_list == NULL
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glyph_id = glyph_id_start + rcp
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格式0 完整
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unicode_list == NULL && glyph_id_ofs_list != NULL
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glyph_id = glyph_id_start + glyph_id_ofs_list[rcp]
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Fomat 紧凑
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unicode_list != NULL && glyph_id_ofs_list == NULL
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glyph_id = glyph_id_start + search(unicode_list, rcp)
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Fomat 完整
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unicode_list != NULL && glyph_id_ofs_list != NULL
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glyph_id = glyph_id_start + glyph_id_ofs_list[search(unicode_list, rcp)]
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*/
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const uint16_t *unicode_list;
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/** 如果(type == LV_FONT_FMT_TXT_CMAP_FORMAT0_...)，则为 `uint8_t *`
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* 如果(type == LV_FONT_FMT_TXT_CMAP_SPARSE_...)，则为 `uint16_t *`
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*/
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const void *glyph_id_ofs_list;
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/** `unicode_list` 和/或 `glyph_id_ofs_list` 的长度 */
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uint16_t list_length;
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/** 此字符映射的类型 */
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lv_font_fmt_txt_cmap_type_t type;
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} lv_font_fmt_txt_cmap_t;
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/* 描述字体的附加数据的结构体 */
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typedef struct {
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/* 所有字形的位图 */
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const uint8_t *glyph_bitmap;
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/* 描述字形 */
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const lv_font_fmt_txt_glyph_dsc_t *glyph_dsc;
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/* 将字形映射到Unicode字符。
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* `lv_font_cmap_fmt_txt_t` 变量的数组 */
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const lv_font_fmt_txt_cmap_t *cmaps;
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/* 存储字距值。
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* 可以是 `lv_font_fmt_txt_kern_pair_t *` 或 `lv_font_kern_classes_fmt_txt_t *`
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* 取决于 `kern_classes` */
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const void *kern_dsc;
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/* 缩放字距值，12.4格式 */
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uint16_t kern_scale;
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/* cmap表的数量 */
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uint16_t cmap_num: 10;
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/* 每像素位数：1, 2, 3, 4, 8 */
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uint16_t bpp: 4;
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/* `kern_dsc` 的类型 */
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uint16_t kern_classes: 1;
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/*
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* 位图的存储格式
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* 取自 `lv_font_fmt_txt_bitmap_format_t`
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*/
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uint16_t bitmap_format: 2;
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/* 缓存最后一个字母和其字形ID */
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uint32_t last_letter;
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uint32_t last_glyph_id;
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} lv_font_fmt_txt_dsc_t;
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/* 坐标类型。应为 `int16_t`（或在极端情况下为 `int32_t`） */
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typedef int16_t lv_coord_t;
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/** 描述字形属性的结构体 */
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typedef struct {
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uint16_t adv_w; /**< 字形所需的空间。在此宽度后绘制下一个字形。8位整数，4位小数 */
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uint16_t box_w; /**< 字形的包围框宽度 */
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uint16_t box_h; /**< 字形的包围框高度 */
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int16_t ofs_x; /**< 包围框的x偏移量 */
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int16_t ofs_y; /**< 包围框的y偏移量 */
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uint8_t bpp; /**< 每像素位数：1, 2, 4, 8 */
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} lv_font_glyph_dsc_t;
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/** 描述字体的属性的结构体 */
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typedef struct _lv_font_struct {
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/** 从字体中获取字形描述符 */
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bool (*get_glyph_dsc)(const struct _lv_font_struct *, lv_font_glyph_dsc_t *, uint32_t letter, uint32_t letter_next);
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/** 从字体中获取字形的位图 */
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const uint8_t *(*get_glyph_bitmap)(const struct _lv_font_struct *, uint32_t);
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/* 指向字体包中的字体的指针（必须具有相同的行高） */
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lv_coord_t line_height; /**< 任何文本都适合的实际行高 */
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lv_coord_t base_line; /**< 从行高顶部测量的基准线 */
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uint8_t subpx: 2; /**< `lv_font_subpx_t` 的一个元素 */
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int8_t underline_position; /**< 下划线顶部与基准线之间的距离（< 0 表示在基准线下方）*/
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int8_t underline_thickness; /**< 下划线的厚度 */
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void *dsc; /**< 在这里存储特定于实现或运行时数据或缓存 */
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} lv_font_t;
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#define NULL 0 /* see <stddef.h> */
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/** Bitmap formats*/
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typedef enum {
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LV_FONT_FMT_TXT_PLAIN = 0,
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LV_FONT_FMT_TXT_COMPRESSED = 1,
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LV_FONT_FMT_TXT_COMPRESSED_NO_PREFILTER = 1,
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} lv_font_fmt_txt_bitmap_format_t;
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typedef uintptr_t lv_uintptr_t;
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/** 用于简单映射字距值对的结构体 */
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typedef struct {
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/* 获取两个字符代码点之间的字距值：
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1. 从 `lv_font_fmt_txt_cmap_t` 中获取 `glyph_id_left` 和 `glyph_id_right`
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2. for(i = 0; i < pair_cnt * 2; i+2)
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if(gylph_ids[i] == glyph_id_left &&
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gylph_ids[i+1] == glyph_id_right)
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return values[i / 2];
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*/
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const void *glyph_ids; /* 存储字形ID对 */
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const int8_t *values; /* 存储字距值 */
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uint32_t pair_cnt: 24; /* 字距值对的数量 */
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uint32_t glyph_ids_size: 2; /* 0: `glyph_ids` 存储为 `uint8_t`; 1: 存储为 `uint16_t` */
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} lv_font_fmt_txt_kern_pair_t;
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/** 更复杂但更优化的基于类别的字距值存储结构体 */
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typedef struct {
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/* 结构体用于获取两个字符代码点之间的字距值：
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1. 从 `lv_font_fmt_txt_cmap_t` 中获取 `glyph_id_left` 和 `glyph_id_right`
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2. 获取左侧和右侧字形的类别，分别为 `left_class` 和 `right_class`
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left_class = left_class_mapping[glyph_id_left];
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right_class = right_class_mapping[glyph_id_right];
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3. value = class_pair_values[(left_class-1)*right_class_cnt + (right_class-1)]
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*/
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const int8_t *class_pair_values; /* 存储左侧类别数 * 右侧类别数的值 */
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const uint8_t *left_class_mapping; /* 将字形ID映射到类别：索引 -> 字形ID -> 类别ID */
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const uint8_t *right_class_mapping; /* 将字形ID映射到类别：索引 -> 字形ID -> 类别ID */
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uint8_t left_class_cnt; /* 左侧类别数 */
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uint8_t right_class_cnt; /* 右侧类别数 */
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} lv_font_fmt_txt_kern_classes_t;
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#endif
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