text.c - ltkx - GUI toolkit for X11 (old)
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text.c (3828B)
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1 /*
2 * This file is part of the Lumidify ToolKit (LTK)
3 * Copyright (c) 2016, 2017 Lumidify Productions <lumidify@openmailbox.org>
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a copy
6 * of this software and associated documentation files (the "Software"), to deal
7 * in the Software without restriction, including without limitation the rights
8 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
9 * copies of the Software, and to permit persons to whom the Software is
10 * furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be included in all
13 * copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 * SOFTWARE.
22 */
23
24 #include <stdio.h>
25 #include <stdlib.h>
26 #include <stdint.h>
27 #include "text.h"
28
29 uint32_t u8_nextmemchar(const char *s, size_t *i)
30 {
31 uint32_t ch = 0;
32 size_t sz = 0;
33 do {
34 ch <<= 6;
35 ch += (unsigned char)s[(*i)++];
36 sz++;
37 } while (!isutf(s[*i]));
38 ch -= offsetsFromUTF8[sz-1];
39
40 return ch;
41 }
42
43 stbtt_fontinfo ltk_load_font(const char *path)
44 {
45 FILE *f;
46 long len;
47 char *contents;
48 stbtt_fontinfo info;
49 f = fopen(path, "rb");
50 fseek(f, 0, SEEK_END);
51 len = ftell(f);
52 fseek(f, 0, SEEK_SET);
53 contents = malloc(len + 1);
54 fread(contents, 1, len, f);
55 contents[len] = '\0';
56 fclose(f);
57 if (!stbtt_InitFont(&info, contents, 0))
58 {
59 fprintf(stderr, "Failed to load font %s\n", path);
60 exit(1);
61 }
62 return info;
63 }
64
65 int ltk_text_width(uint8_t *text, stbtt_fontinfo fontinfo, int height)
66 {
67 float scale = stbtt_ScaleForPixelHeight(&fontinfo, height);
68 size_t i = 0;
69 int length = strlen(text);
70 if (length < 1) return 0;
71 int temp_x;
72 int kern_advance;
73 int width = 0;
74 uint32_t char1;
75 uint32_t char2;
76 char1 = u8_nextmemchar(text, &i);
77 while(i <= length)
78 {
79 stbtt_GetCodepointHMetrics(&fontinfo, char1, &temp_x, 0);
80 width += temp_x * scale;
81
82 char2 = u8_nextmemchar(text, &i);
83 if (!char2) break;
84 kern_advance = stbtt_GetCodepointKernAdvance(&fontinfo, char1, char2);
85 width += kern_advance * scale;
86 char1 = char2;
87 }
88
89 return width;
90 }
91
92 unsigned char *ltk_render_text(uint8_t *text, stbtt_fontinfo fontinfo, int height, int width)
93 {
94 /* int width = ltk_text_width(text, fontinfo, height);*/
95 unsigned char *bitmap = calloc(width * height, sizeof(char));
96 float scale = stbtt_ScaleForPixelHeight(&fontinfo, height);
97
98 int ascent, descent, line_gap;
99 stbtt_GetFontVMetrics(&fontinfo, &ascent, &descent, &line_gap);
100 ascent *= scale;
101 descent *= scale;
102
103 size_t i = 0;
104 int length = strlen(text);
105 if (length < 1)
106 {
107 printf("WARNING: ltk_render_text: length of text is less than 1.\n");
108 return bitmap;
109 }
110 uint32_t char1, char2;
111 char1 = u8_nextmemchar(text, &i);
112 int ax, x = 0, y, x1, y1, x2, y2, byte_offset, kern_advance;
113 while (i <= length)
114 {
115 stbtt_GetCodepointBitmapBox(&fontinfo, char1, scale, scale, &x1, &y1, &x2, &y2);
116 y = ascent + y1;
117 byte_offset = x + (y * width);
118 stbtt_MakeCodepointBitmap(&fontinfo, bitmap + byte_offset, x2 - x1, y2 - y1, width, scale, scale, char1);
119
120 stbtt_GetCodepointHMetrics(&fontinfo, char1, &ax, 0);
121 x += ax * scale;
122
123 char2 = u8_nextmemchar(text, &i);
124 if (!char2) break;
125 kern_advance = stbtt_GetCodepointKernAdvance(&fontinfo, char1, char2);
126 x += kern_advance * scale;
127 char1 = char2;
128 }
129
130 return bitmap;
131 }