1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
|
#include <cairo/cairo.h>
#include <glib.h>
#include <harfbuzz/hb-ft.h>
#include <harfbuzz/hb-glib.h>
#include <math.h>
#include <pango/pangocairo.h>
#include <pango/pango.h>
#include <wchar.h>
#include "../entry.h"
#include "../log.h"
#include "../nelem.h"
#include "../xmalloc.h"
/*
* Cairo / FreeType use 72 Pts per inch, but Pango uses 96 DPI, so we have to
* rescale for consistency.
*/
#define PT_TO_DPI (96.0 / 72.0)
static void setup_hb_buffer(hb_buffer_t *buffer)
{
hb_buffer_set_direction(buffer, HB_DIRECTION_LTR);
hb_buffer_set_script(buffer, HB_SCRIPT_LATIN);
hb_buffer_set_language(buffer, hb_language_from_string("en", -1));
}
static hb_buffer_t *create_hb_buffer(void)
{
hb_buffer_t *buffer = hb_buffer_create();
hb_buffer_set_unicode_funcs(buffer, hb_glib_get_unicode_funcs());
setup_hb_buffer(buffer);
return buffer;
}
static uint32_t render_hb_buffer(cairo_t *cr, hb_buffer_t *buffer, uint32_t scale)
{
cairo_save(cr);
cairo_font_extents_t font_extents;
cairo_font_extents(cr, &font_extents);
cairo_matrix_t font_matrix;
cairo_get_font_matrix(cr, &font_matrix);
double baseline = (font_matrix.xx - font_extents.height) / 2 + font_extents.ascent;
cairo_translate(cr, 0, baseline);
unsigned int glyph_count;
hb_glyph_info_t *glyph_info = hb_buffer_get_glyph_infos(buffer, &glyph_count);
hb_glyph_position_t *glyph_pos = hb_buffer_get_glyph_positions(buffer, &glyph_count);
cairo_glyph_t *cairo_glyphs = xmalloc(sizeof(cairo_glyph_t) * glyph_count);
double width = 0;
for (unsigned int i=0; i < glyph_count; ++i) {
width += glyph_pos[i].x_advance / 64.0 / scale;
}
double x = 0;
double y = 0;
for (unsigned int i=0; i < glyph_count; ++i) {
cairo_glyphs[i].index = glyph_info[i].codepoint;
cairo_glyphs[i].x = x + glyph_pos[i].x_offset / 64.0 / scale;
cairo_glyphs[i].y = y - glyph_pos[i].y_offset / 64.0 / scale;
x += glyph_pos[i].x_advance / 64.0 / scale;
y -= glyph_pos[i].y_advance / 64.0 / scale;
}
cairo_show_glyphs(cr, cairo_glyphs, glyph_count);
free(cairo_glyphs);
cairo_restore(cr);
return ceil(width);
}
void entry_backend_init(struct entry *entry, uint32_t *width, uint32_t *height, uint32_t scale)
{
cairo_t *cr = entry->cairo[0].cr;
/* Setup FreeType. */
log_debug("Creating FreeType library.\n");
FT_Init_FreeType(&entry->backend.ft_library);
log_debug("Loading FreeType font.\n");
FT_New_Face(entry->backend.ft_library, "font.ttf", 0, &entry->backend.ft_face);
FT_Set_Char_Size(
entry->backend.ft_face,
entry->font_size * 64 * scale * PT_TO_DPI,
entry->font_size * 64 * scale * PT_TO_DPI,
0,
0);
log_debug("Creating Cairo font.\n");
entry->backend.cairo_face = cairo_ft_font_face_create_for_ft_face(entry->backend.ft_face, 0);
struct color color = entry->foreground_color;
cairo_set_source_rgba(cr, color.r, color.g, color.b, color.a);
cairo_set_font_face(cr, entry->backend.cairo_face);
cairo_set_font_size(cr, entry->font_size * PT_TO_DPI);
/* We also need to set up the font for our other Cairo context. */
cairo_set_font_face(entry->cairo[1].cr, entry->backend.cairo_face);
cairo_set_font_size(entry->cairo[1].cr, entry->font_size * PT_TO_DPI);
log_debug("Creating Harfbuzz font.\n");
entry->backend.hb_font = hb_ft_font_create_referenced(entry->backend.ft_face);
log_debug("Creating Harfbuzz buffer.\n");
entry->backend.hb_buffer = create_hb_buffer();
/* Draw the prompt now, as this only needs to be done once */
log_debug("Drawing prompt.\n");
hb_buffer_add_utf8(entry->backend.hb_buffer, "run: ", -1, 0, -1);
hb_shape(entry->backend.hb_font, entry->backend.hb_buffer, NULL, 0);
/* Move and clip so we don't draw over the prompt */
uint32_t prompt_width = render_hb_buffer(cr, entry->backend.hb_buffer, scale);
cairo_translate(cr, prompt_width, 0);
*width -= prompt_width;
cairo_rectangle(cr, 0, 0, *width, *height);
cairo_clip(cr);
}
void entry_backend_destroy(struct entry *entry)
{
hb_buffer_destroy(entry->backend.hb_buffer);
hb_font_destroy(entry->backend.hb_font);
FT_Done_Face(entry->backend.ft_face);
FT_Done_FreeType(entry->backend.ft_library);
}
void entry_backend_update(struct entry *entry)
{
cairo_t *cr = entry->cairo[entry->index].cr;
hb_buffer_clear_contents(entry->backend.hb_buffer);
setup_hb_buffer(entry->backend.hb_buffer);
hb_buffer_add_utf8(entry->backend.hb_buffer, entry->input_mb, -1, 0, -1);
hb_shape(entry->backend.hb_font, entry->backend.hb_buffer, NULL, 0);
render_hb_buffer(cr, entry->backend.hb_buffer, entry->image.scale);
cairo_font_extents_t font_extents;
cairo_font_extents(cr, &font_extents);
for (size_t i = 0; i < 5; i++) {
cairo_translate(cr, 0, font_extents.height);
hb_buffer_t *buffer = entry->backend.hb_buffer;
hb_buffer_clear_contents(buffer);
setup_hb_buffer(buffer);
if (i < entry->results.count) {
hb_buffer_add_utf8(buffer, entry->results.buf[i], -1, 0, -1);
hb_shape(entry->backend.hb_font, buffer, NULL, 0);
render_hb_buffer(cr, buffer, entry->image.scale);
}
}
}
|
