1 /**
2 * @file lv_imgfont.c
3 *
4 */
5
6 /*********************
7 * INCLUDES
8 *********************/
9 #include "lv_imgfont.h"
10
11 #if LV_USE_IMGFONT
12
13 /*********************
14 * DEFINES
15 *********************/
16 #define LV_IMGFONT_PATH_MAX_LEN 64
17
18 /**********************
19 * TYPEDEFS
20 **********************/
21 typedef struct {
22 lv_font_t * font;
23 lv_get_imgfont_path_cb_t path_cb;
24 char path[LV_IMGFONT_PATH_MAX_LEN];
25 } imgfont_dsc_t;
26
27 /**********************
28 * STATIC PROTOTYPES
29 **********************/
30 static const uint8_t * imgfont_get_glyph_bitmap(const lv_font_t * font, uint32_t unicode);
31 static bool imgfont_get_glyph_dsc(const lv_font_t * font, lv_font_glyph_dsc_t * dsc_out,
32 uint32_t unicode, uint32_t unicode_next);
33
34 /**********************
35 * STATIC VARIABLES
36 **********************/
37
38 /**********************
39 * GLOBAL PROTOTYPES
40 **********************/
41
42 /**********************
43 * MACROS
44 **********************/
45
46 /**********************
47 * GLOBAL FUNCTIONS
48 **********************/
lv_imgfont_create(uint16_t height,lv_get_imgfont_path_cb_t path_cb)49 lv_font_t * lv_imgfont_create(uint16_t height, lv_get_imgfont_path_cb_t path_cb)
50 {
51 LV_ASSERT_MSG(LV_IMGFONT_PATH_MAX_LEN > sizeof(lv_img_dsc_t),
52 "LV_IMGFONT_PATH_MAX_LEN must be greater than sizeof(lv_img_dsc_t)");
53
54 size_t size = sizeof(imgfont_dsc_t) + sizeof(lv_font_t);
55 imgfont_dsc_t * dsc = (imgfont_dsc_t *)lv_mem_alloc(size);
56 if(dsc == NULL) return NULL;
57 lv_memset_00(dsc, size);
58
59 dsc->font = (lv_font_t *)(((char *)dsc) + sizeof(imgfont_dsc_t));
60 dsc->path_cb = path_cb;
61
62 lv_font_t * font = dsc->font;
63 font->dsc = dsc;
64 font->get_glyph_dsc = imgfont_get_glyph_dsc;
65 font->get_glyph_bitmap = imgfont_get_glyph_bitmap;
66 font->subpx = LV_FONT_SUBPX_NONE;
67 font->line_height = height;
68 font->base_line = 0;
69 font->underline_position = 0;
70 font->underline_thickness = 0;
71
72 return dsc->font;
73 }
74
lv_imgfont_destroy(lv_font_t * font)75 void lv_imgfont_destroy(lv_font_t * font)
76 {
77 if(font == NULL) {
78 return;
79 }
80
81 imgfont_dsc_t * dsc = (imgfont_dsc_t *)font->dsc;
82 lv_mem_free(dsc);
83 }
84
85 /**********************
86 * STATIC FUNCTIONS
87 **********************/
88
imgfont_get_glyph_bitmap(const lv_font_t * font,uint32_t unicode)89 static const uint8_t * imgfont_get_glyph_bitmap(const lv_font_t * font, uint32_t unicode)
90 {
91 LV_UNUSED(unicode);
92 LV_ASSERT_NULL(font);
93 imgfont_dsc_t * dsc = (imgfont_dsc_t *)font->dsc;
94 return (uint8_t *)dsc->path;
95 }
96
imgfont_get_glyph_dsc(const lv_font_t * font,lv_font_glyph_dsc_t * dsc_out,uint32_t unicode,uint32_t unicode_next)97 static bool imgfont_get_glyph_dsc(const lv_font_t * font, lv_font_glyph_dsc_t * dsc_out,
98 uint32_t unicode, uint32_t unicode_next)
99 {
100 LV_ASSERT_NULL(font);
101
102 imgfont_dsc_t * dsc = (imgfont_dsc_t *)font->dsc;
103 LV_ASSERT_NULL(dsc);
104 if(dsc->path_cb == NULL) return false;
105
106 if(!dsc->path_cb(dsc->font, dsc->path, LV_IMGFONT_PATH_MAX_LEN, unicode, unicode_next)) {
107 return false;
108 }
109
110 lv_img_header_t header;
111 if(lv_img_decoder_get_info(dsc->path, &header) != LV_RES_OK) {
112 return false;
113 }
114
115 dsc_out->is_placeholder = 0;
116 dsc_out->adv_w = header.w;
117 dsc_out->box_w = header.w;
118 dsc_out->box_h = header.h;
119 dsc_out->bpp = LV_IMGFONT_BPP; /* is image identifier */
120 dsc_out->ofs_x = 0;
121 dsc_out->ofs_y = 0;
122
123 return true;
124 }
125
126 #endif /*LV_USE_IMGFONT*/
127
