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
|
/* See LICENSE file for copyright and license details. */
#include "common.h"
#define FORCED_FLAGS (LIBSKRIFT_NO_LIGATURES |\
LIBSKRIFT_NO_AUTOHINTING |\
LIBSKRIFT_NO_AUTOKERNING)
#define IMPLEMENTED_FLAGS (LIBSKRIFT_REMOVE_GAMMA |\
LIBSKRIFT_MIRROR_TEXT |\
LIBSKRIFT_MIRROR_CHARS |\
FORCED_FLAGS) /* libschrift does not add gamma, so not handling is required */
#define TRANSFORMING_FLAGS (LIBSKRIFT_MIRROR_TEXT |\
LIBSKRIFT_MIRROR_CHARS |\
LIBSKRIFT_TRANSPOSE_TEXT |\
LIBSKRIFT_TRANSPOSE_CHARS)
#define COPY_ARRAY(DEST_STRUCT, SRC_STRUCT, FIELD)\
memcpy((DEST_STRUCT).FIELD, (SRC_STRUCT).FIELD, sizeof((SRC_STRUCT).FIELD))
static const struct libskrift_rendering default_rendering = LIBSKRIFT_DEFAULT_RENDERING;
static void
multiply_matrices(const double a[restrict 6], const double b[restrict 6], double r[restrict 6])
{
r[0] = a[0] * b[0] + a[1] * b[3];
r[1] = a[0] * b[1] + a[1] * b[4];
r[2] = a[0] * b[2] + a[1] * b[5] + a[2];
r[3] = a[3] * b[0] + a[4] * b[3];
r[4] = a[3] * b[1] + a[4] * b[4];
r[5] = a[3] * b[2] + a[4] * b[5] + a[5];
}
static int
transformation_hook(void *hook_data, double advance, double transform[6])
{
LIBSKRIFT_CONTEXT *ctx = hook_data;
double schrift[6] = {transform[0], transform[2], transform[4],
transform[1], transform[3], transform[5]};
double m1[6] = {1, 0, 0, 0, 1, 0}, m2[6] = {1, 0, 0, 0, 1, 0};
if (((ctx->rendering.flags / LIBSKRIFT_MIRROR_CHARS) ^ (ctx->rendering.flags / LIBSKRIFT_MIRROR_TEXT)) & 1)
multiply_matrices((double []){-1, 0, advance / schrift[0], 0, 1, 0}, m2, m1);
multiply_matrices(ctx->transformation, m1, m2);
multiply_matrices(schrift, m2, m1);
transform[0] = m1[0];
transform[2] = m1[1];
transform[4] = m1[2];
transform[1] = m1[3];
transform[3] = m1[4];
transform[5] = m1[5];
return 0;
}
int
libskrift_create_context(LIBSKRIFT_CONTEXT **ctxp, LIBSKRIFT_FONT **fonts, size_t nfonts, double height,
const struct libskrift_rendering *rendering, void *caching)
{
size_t i;
(void) caching;
if (!nfonts) {
errno = EINVAL;
return -1;
}
if (rendering) {
if (!rendering->grid_fineness) {
errno = EINVAL;
return -1;
}
}
*ctxp = calloc(1, FLEXSTRUCTSIZE(LIBSKRIFT_CONTEXT, fonts, nfonts));
if (!*ctxp)
return -1;
(*ctxp)->schrift_ctx.font = fonts[0]->font;
(*ctxp)->schrift_ctx.yScale = height;
(*ctxp)->x_advancement = 1;
(*ctxp)->y_advancement = 0;
(*ctxp)->nfonts = nfonts;
for (i = 0; i < nfonts; i++) {
(*ctxp)->fonts[i] = fonts[i];
fonts[i]->refcount += 1;
}
if (rendering) {
memcpy(&(*ctxp)->rendering, rendering, sizeof(*rendering));
COPY_ARRAY((*ctxp)->rendering, default_rendering, prestroke_transformation_rotation);
COPY_ARRAY((*ctxp)->rendering, default_rendering, left_transformation);
COPY_ARRAY((*ctxp)->rendering, default_rendering, right_transformation);
COPY_ARRAY((*ctxp)->rendering, default_rendering, top_transformation);
COPY_ARRAY((*ctxp)->rendering, default_rendering, bottom_transformation);
COPY_ARRAY((*ctxp)->rendering, default_rendering, poststroke_transformation_rotation);
} else {
memcpy(&(*ctxp)->rendering, &default_rendering, sizeof(default_rendering));
}
(*ctxp)->rendering.struct_version = LIBSKRIFT_RENDERING_STRUCT_VERSION;
(*ctxp)->rendering.hinting = LIBSKRIFT_NONE;
(*ctxp)->rendering.flags &= IMPLEMENTED_FLAGS;
(*ctxp)->rendering.flags |= FORCED_FLAGS;
(*ctxp)->rendering.flags |= LIBSKRIFT_REMOVE_GAMMA; /* libschrift does not add gamma */
(*ctxp)->rendering.grid_fineness = 1;
(*ctxp)->rendering.kerning = 0;
if (!(*ctxp)->rendering.smoothing)
(*ctxp)->rendering.smoothing = LIBSKRIFT_GREYSCALE;
(*ctxp)->schrift_ctx.xScale = (*ctxp)->schrift_ctx.yScale;
(*ctxp)->schrift_ctx.xScale *= (*ctxp)->rendering.horizontal_dpi / (*ctxp)->rendering.vertical_dpi;
(*ctxp)->schrift_ctx.hook_data = (*ctxp);
if (((*ctxp)->rendering.flags & TRANSFORMING_FLAGS) ||
fpclassify((*ctxp)->rendering.char_transformation[0] - 1) != FP_ZERO ||
fpclassify((*ctxp)->rendering.char_transformation[1]) != FP_ZERO ||
fpclassify((*ctxp)->rendering.char_transformation[2]) != FP_ZERO ||
fpclassify((*ctxp)->rendering.char_transformation[3]) != FP_ZERO ||
fpclassify((*ctxp)->rendering.char_transformation[4] - 1) != FP_ZERO ||
fpclassify((*ctxp)->rendering.char_transformation[5]) != FP_ZERO ||
fpclassify((*ctxp)->rendering.text_transformation[0] - 1) != FP_ZERO ||
fpclassify((*ctxp)->rendering.text_transformation[1]) != FP_ZERO ||
fpclassify((*ctxp)->rendering.text_transformation[2]) != FP_ZERO ||
fpclassify((*ctxp)->rendering.text_transformation[3]) != FP_ZERO ||
fpclassify((*ctxp)->rendering.text_transformation[4] - 1) != FP_ZERO ||
fpclassify((*ctxp)->rendering.text_transformation[5]) != FP_ZERO) {
memcpy((*ctxp)->transformation, (*ctxp)->rendering.char_transformation, sizeof((*ctxp)->transformation));
libskrift_add_transformation((*ctxp)->transformation, (*ctxp)->rendering.text_transformation);
(*ctxp)->x_advancement = (*ctxp)->rendering.text_transformation[0];
(*ctxp)->y_advancement = (*ctxp)->rendering.text_transformation[3];
(*ctxp)->schrift_ctx.transformation_hook = transformation_hook;
}
if ((*ctxp)->rendering.smoothing == LIBSKRIFT_SUBPIXEL) {
if ((*ctxp)->rendering.subpixel_order == LIBSKRIFT_RGB) {
(*ctxp)->schrift_ctx.xScale *= 3;
(*ctxp)->subpixel_horizontally = 1;
} else if ((*ctxp)->rendering.subpixel_order == LIBSKRIFT_BGR) {
(*ctxp)->schrift_ctx.xScale *= 3;
(*ctxp)->subpixel_horizontally = 1;
(*ctxp)->subpixel_bgr = 1;
} else if ((*ctxp)->rendering.subpixel_order == LIBSKRIFT_VRGB) {
(*ctxp)->schrift_ctx.yScale *= 3;
(*ctxp)->subpixel_vertically = 1;
} else if ((*ctxp)->rendering.subpixel_order == LIBSKRIFT_VBGR) {
(*ctxp)->schrift_ctx.yScale *= 3;
(*ctxp)->subpixel_vertically = 1;
(*ctxp)->subpixel_bgr = 1;
} else {
(*ctxp)->rendering.subpixel_order = LIBSKRIFT_NONE;
(*ctxp)->rendering.smoothing = LIBSKRIFT_GREYSCALE;
}
}
return 0;
}
|