text.c.bak - ltkx - GUI toolkit for X11 (old)
HTML git clone git://lumidify.org/ltkx.git (fast, but not encrypted)
HTML git clone https://lumidify.org/ltkx.git (encrypted, but very slow)
HTML git clone git://4kcetb7mo7hj6grozzybxtotsub5bempzo4lirzc3437amof2c2impyd.onion/ltkx.git (over tor)
DIR Log
DIR Files
DIR Refs
DIR README
DIR LICENSE
---
text.c.bak (4686B)
---
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 <X11/Xlib.h>
28 #include <X11/Xutil.h>
29 #include "text.h"
30
31 uint32_t u8_nextmemchar(const char *s, size_t *i)
32 {
33 uint32_t ch = 0;
34 size_t sz = 0;
35 do {
36 ch <<= 6;
37 ch += (unsigned char)s[(*i)++];
38 sz++;
39 } while (!isutf(s[*i]));
40 ch -= offsetsFromUTF8[sz-1];
41
42 return ch;
43 }
44
45 stbtt_fontinfo ltk_load_font(const char *path)
46 {
47 FILE *f;
48 long len;
49 char *contents;
50 stbtt_fontinfo info;
51 f = fopen(path, "rb");
52 fseek(f, 0, SEEK_END);
53 len = ftell(f);
54 fseek(f, 0, SEEK_SET);
55 contents = malloc(len + 1);
56 fread(contents, 1, len, f);
57 contents[len] = '\0';
58 fclose(f);
59 if (!stbtt_InitFont(&info, contents, 0))
60 {
61 fprintf(stderr, "Failed to load font %s\n", path);
62 exit(1);
63 }
64 return info;
65 }
66
67 int ltk_text_width(uint8_t *text, stbtt_fontinfo fontinfo, int height)
68 {
69 float scale = stbtt_ScaleForPixelHeight(&fontinfo, height);
70 size_t i = 0;
71 int length = strlen(text);
72 if (length < 1) return 0;
73 int temp_x;
74 int kern_advance;
75 int width = 0;
76 uint32_t char1;
77 uint32_t char2;
78 char1 = u8_nextmemchar(text, &i);
79 while(i <= length)
80 {
81 stbtt_GetCodepointHMetrics(&fontinfo, char1, &temp_x, 0);
82 width += temp_x * scale;
83
84 char2 = u8_nextmemchar(text, &i);
85 if (!char2) break;
86 kern_advance = stbtt_GetCodepointKernAdvance(&fontinfo, char1, char2);
87 width += kern_advance * scale;
88 char1 = char2;
89 }
90
91 return width;
92 }
93
94 Pixmap ltk_render_text(
95 Display *display,
96 Window window,
97 GC gc,
98 uint8_t *text,
99 stbtt_fontinfo fontinfo,
100 int height,
101 unsigned long fg,
102 unsigned long bg)
103 {
104 XWindowAttributes attrs;
105 XGetWindowAttributes(display, window, &attrs);
106 int depth = attrs.depth;
107
108 int width = ltk_text_width(text, fontinfo, height);
109 unsigned char *bitmap = calloc(sizeof(char), width * height);
110 float scale = stbtt_ScaleForPixelHeight(&fontinfo, height);
111
112 int ascent, descent, line_gap;
113 stbtt_GetFontVMetrics(&fontinfo, &ascent, &descent, &line_gap);
114 ascent *= scale;
115 descent *= scale;
116
117 size_t i = 0;
118 int length = strlen(text);
119 if (length < 1)
120 {
121 printf("WARNING: ltk_render_text: length of text is less than 1.\n");
122 return XCreatePixmap(display, window, 0, 0, depth);
123 }
124 uint32_t char1, char2;
125 char1 = u8_nextmemchar(text, &i);
126 int ax, x = 0, y, x1, y1, x2, y2, byte_offset, kern_advance;
127 while (i <= length)
128 {
129 stbtt_GetCodepointBitmapBox(&fontinfo, char1, scale, scale, &x1, &y1, &x2, &y2);
130 y = ascent + y1;
131 byte_offset = x + (y * width);
132 stbtt_MakeCodepointBitmap(&fontinfo, bitmap + byte_offset, x2 - x1, y2 - y1, width, scale, scale, char1);
133
134 stbtt_GetCodepointHMetrics(&fontinfo, char1, &ax, 0);
135 x += ax * scale;
136
137 char2 = u8_nextmemchar(text, &i);
138 if (!char2) break;
139 kern_advance = stbtt_GetCodepointKernAdvance(&fontinfo, char1, char2);
140 x += kern_advance * scale;
141 char1 = char2;
142 }
143
144 /* TODO: separate this into a separate function so that one function only creates
145 * the bitmap and other functions to turn that into a pixmap with solid color
146 * background, image background, etc.
147 */
148 Pixmap rendered = XCreatePixmap(display, window, width, height, depth);
149 XSetForeground(display, gc, bg);
150 for (int i = 0; i < height; i++)
151 {
152 for (int j = 0; j < width; j++)
153 {
154 /* Yay! Magic! */
155 XSetForeground(display, gc, (bitmap[i * width + j] / 255.0) * fg + ((255 - bitmap[i * width + j]) / 255.0) * bg);
156 XDrawPoint(display, rendered, gc, j, i);
157 }
158 }
159 XSetForeground(display, gc, bg);
160 return rendered;
161 }