forked from libharu/libharu
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathhpdf_ext_gstate.c
153 lines (117 loc) · 4.15 KB
/
hpdf_ext_gstate.c
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
/*
* << Haru Free PDF Library >> -- hpdf_ext_gstate.c
*
* URL: http://libharu.org
*
* Copyright (c) 1999-2006 Takeshi Kanno <[email protected]>
* Copyright (c) 2007-2009 Antony Dovgal <[email protected]>
*
* Permission to use, copy, modify, distribute and sell this software
* and its documentation for any purpose is hereby granted without fee,
* provided that the above copyright notice appear in all copies and
* that both that copyright notice and this permission notice appear
* in supporting documentation.
* It is provided "as is" without express or implied warranty.
*
*/
#include "hpdf_conf.h"
#include "hpdf_utils.h"
#include "hpdf_ext_gstate.h"
#include "hpdf.h"
static const char * const HPDF_BM_NAMES[] = {
"Normal",
"Multiply",
"Screen",
"Overlay",
"Darken",
"Lighten",
"ColorDodge",
"ColorBurn",
"HardLight",
"SoftLight",
"Difference",
"Exclusion"
};
HPDF_BOOL
HPDF_ExtGState_Validate (HPDF_ExtGState ext_gstate)
{
if (!ext_gstate || (ext_gstate->header.obj_class !=
(HPDF_OSUBCLASS_EXT_GSTATE | HPDF_OCLASS_DICT) &&
ext_gstate->header.obj_class !=
(HPDF_OSUBCLASS_EXT_GSTATE_R | HPDF_OCLASS_DICT)))
return HPDF_FALSE;
return HPDF_TRUE;
}
HPDF_STATUS
ExtGState_Check (HPDF_ExtGState ext_gstate)
{
if (!HPDF_ExtGState_Validate (ext_gstate))
return HPDF_INVALID_OBJECT;
if (ext_gstate->header.obj_class ==
(HPDF_OSUBCLASS_EXT_GSTATE_R | HPDF_OCLASS_DICT))
return HPDF_RaiseError (ext_gstate->error, HPDF_EXT_GSTATE_READ_ONLY,
0);
return HPDF_OK;
}
HPDF_Dict
HPDF_ExtGState_New (HPDF_MMgr mmgr,
HPDF_Xref xref)
{
HPDF_Dict obj = HPDF_Dict_New (mmgr);
HPDF_PTRACE ((" HPDF_ExtGState_New\n"));
if (!obj)
return NULL;
if (HPDF_Xref_Add (xref, obj) != HPDF_OK)
return NULL;
if (HPDF_Dict_AddName (obj, "Type", "ExtGState") != HPDF_OK)
return NULL;
obj->header.obj_class |= HPDF_OSUBCLASS_EXT_GSTATE;
return obj;
}
HPDF_EXPORT(HPDF_STATUS)
HPDF_ExtGState_SetAlphaStroke (HPDF_ExtGState ext_gstate,
HPDF_REAL value)
{
HPDF_STATUS ret = ExtGState_Check (ext_gstate);
if (ret != HPDF_OK)
return ret;
if (value < 0 || value > 1.0f)
return HPDF_RaiseError (ext_gstate->error,
HPDF_EXT_GSTATE_OUT_OF_RANGE, 0);
return HPDF_Dict_AddReal (ext_gstate, "CA", value);
}
HPDF_EXPORT(HPDF_STATUS)
HPDF_ExtGState_SetAlphaFill (HPDF_ExtGState ext_gstate,
HPDF_REAL value)
{
HPDF_STATUS ret = ExtGState_Check (ext_gstate);
if (ret != HPDF_OK)
return ret;
if (value < 0 || value > 1.0f)
return HPDF_RaiseError (ext_gstate->error,
HPDF_EXT_GSTATE_OUT_OF_RANGE, 0);
return HPDF_Dict_AddReal (ext_gstate, "ca", value);
}
HPDF_EXPORT(HPDF_STATUS)
HPDF_ExtGState_SetBlendMode (HPDF_ExtGState ext_gstate,
HPDF_BlendMode bmode)
{
HPDF_STATUS ret = ExtGState_Check (ext_gstate);
if (ret != HPDF_OK)
return ret;
if ((int)bmode < 0 || (int)bmode > (int)HPDF_BM_EOF)
return HPDF_RaiseError (ext_gstate->error,
HPDF_EXT_GSTATE_OUT_OF_RANGE, 0);
return HPDF_Dict_AddName (ext_gstate, "BM", HPDF_BM_NAMES[(int)bmode]);
}
/*
HPDF_STATUS
HPDF_ExtGState_SetStrokeAdjustment (HPDF_ExtGState ext_gstate,
HPDF_BOOL value)
{
HPDF_STATUS ret = ExtGState_Check (ext_gstate);
if (ret != HPDF_OK)
return ret;
return HPDF_Dict_AddBoolean (ext_gstate, "SA", value);
}
*/