summaryrefslogtreecommitdiff
path: root/pdf/pdf_metrics.c
blob: 2fc085dee06923d14fe9a1267f99807933f3bd35 (plain)
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
#include "fitz.h"
#include "mupdf.h"

void
pdf_set_font_wmode(pdf_font_desc *font, int wmode)
{
	font->wmode = wmode;
}

void
pdf_set_default_hmtx(pdf_font_desc *font, int w)
{
	font->dhmtx.w = w;
}

void
pdf_set_default_vmtx(pdf_font_desc *font, int y, int w)
{
	font->dvmtx.y = y;
	font->dvmtx.w = w;
}

void
pdf_add_hmtx(pdf_font_desc *font, int lo, int hi, int w)
{
	if (font->hmtx_len + 1 >= font->hmtx_cap)
	{
		font->hmtx_cap = font->hmtx_cap + 16;
		font->hmtx = fz_realloc(font->hmtx, font->hmtx_cap, sizeof(pdf_hmtx));
	}

	font->hmtx[font->hmtx_len].lo = lo;
	font->hmtx[font->hmtx_len].hi = hi;
	font->hmtx[font->hmtx_len].w = w;
	font->hmtx_len++;
}

void
pdf_add_vmtx(pdf_font_desc *font, int lo, int hi, int x, int y, int w)
{
	if (font->vmtx_len + 1 >= font->vmtx_cap)
	{
		font->vmtx_cap = font->vmtx_cap + 16;
		font->vmtx = fz_realloc(font->vmtx, font->vmtx_cap, sizeof(pdf_vmtx));
	}

	font->vmtx[font->vmtx_len].lo = lo;
	font->vmtx[font->vmtx_len].hi = hi;
	font->vmtx[font->vmtx_len].x = x;
	font->vmtx[font->vmtx_len].y = y;
	font->vmtx[font->vmtx_len].w = w;
	font->vmtx_len++;
}

static int cmph(const void *a0, const void *b0)
{
	pdf_hmtx *a = (pdf_hmtx*)a0;
	pdf_hmtx *b = (pdf_hmtx*)b0;
	return a->lo - b->lo;
}

static int cmpv(const void *a0, const void *b0)
{
	pdf_vmtx *a = (pdf_vmtx*)a0;
	pdf_vmtx *b = (pdf_vmtx*)b0;
	return a->lo - b->lo;
}

void
pdf_end_hmtx(pdf_font_desc *font)
{
	if (!font->hmtx)
		return;
	qsort(font->hmtx, font->hmtx_len, sizeof(pdf_hmtx), cmph);
}

void
pdf_end_vmtx(pdf_font_desc *font)
{
	if (!font->vmtx)
		return;
	qsort(font->vmtx, font->vmtx_len, sizeof(pdf_vmtx), cmpv);
}

pdf_hmtx
pdf_get_hmtx(pdf_font_desc *font, int cid)
{
	int l = 0;
	int r = font->hmtx_len - 1;
	int m;

	if (!font->hmtx)
		goto notfound;

	while (l <= r)
	{
		m = (l + r) >> 1;
		if (cid < font->hmtx[m].lo)
			r = m - 1;
		else if (cid > font->hmtx[m].hi)
			l = m + 1;
		else
			return font->hmtx[m];
	}

notfound:
	return font->dhmtx;
}

pdf_vmtx
pdf_get_vmtx(pdf_font_desc *font, int cid)
{
	pdf_hmtx h;
	pdf_vmtx v;
	int l = 0;
	int r = font->vmtx_len - 1;
	int m;

	if (!font->vmtx)
		goto notfound;

	while (l <= r)
	{
		m = (l + r) >> 1;
		if (cid < font->vmtx[m].lo)
			r = m - 1;
		else if (cid > font->vmtx[m].hi)
			l = m + 1;
		else
			return font->vmtx[m];
	}

notfound:
	h = pdf_get_hmtx(font, cid);
	v = font->dvmtx;
	v.x = h.w / 2;
	return v;
}