1/*
2 * << Haru Free PDF Library >> -- hpdf_ext_gstate.c
3 *
4 * URL: http://libharu.org
5 *
6 * Copyright (c) 1999-2006 Takeshi Kanno <takeshi_kanno@est.hi-ho.ne.jp>
7 * Copyright (c) 2007-2009 Antony Dovgal <tony@daylessday.org>
8 *
9 * Permission to use, copy, modify, distribute and sell this software
10 * and its documentation for any purpose is hereby granted without fee,
11 * provided that the above copyright notice appear in all copies and
12 * that both that copyright notice and this permission notice appear
13 * in supporting documentation.
14 * It is provided "as is" without express or implied warranty.
15 *
16 */
17
18#include "hpdf_conf.h"
19#include "hpdf_utils.h"
20#include "hpdf_ext_gstate.h"
21#include "hpdf.h"
22
23static const char * const HPDF_BM_NAMES[] = {
24 "Normal",
25 "Multiply",
26 "Screen",
27 "Overlay",
28 "Darken",
29 "Lighten",
30 "ColorDodge",
31 "ColorBurn",
32 "HardLight",
33 "SoftLight",
34 "Difference",
35 "Exclusion"
36 };
37
38
39HPDF_BOOL
40HPDF_ExtGState_Validate (HPDF_ExtGState ext_gstate)
41{
42 if (!ext_gstate || (ext_gstate->header.obj_class !=
43 (HPDF_OSUBCLASS_EXT_GSTATE | HPDF_OCLASS_DICT) &&
44 ext_gstate->header.obj_class !=
45 (HPDF_OSUBCLASS_EXT_GSTATE_R | HPDF_OCLASS_DICT)))
46 return HPDF_FALSE;
47
48 return HPDF_TRUE;
49}
50
51
52HPDF_STATUS
53ExtGState_Check (HPDF_ExtGState ext_gstate)
54{
55 if (!HPDF_ExtGState_Validate (ext_gstate))
56 return HPDF_INVALID_OBJECT;
57
58 if (ext_gstate->header.obj_class ==
59 (HPDF_OSUBCLASS_EXT_GSTATE_R | HPDF_OCLASS_DICT))
60 return HPDF_RaiseError (ext_gstate->error, HPDF_EXT_GSTATE_READ_ONLY,
61 0);
62
63 return HPDF_OK;
64}
65
66
67HPDF_Dict
68HPDF_ExtGState_New (HPDF_MMgr mmgr,
69 HPDF_Xref xref)
70{
71 HPDF_Dict obj = HPDF_Dict_New (mmgr);
72
73 HPDF_PTRACE ((" HPDF_ExtGState_New\n"));
74
75 if (!obj)
76 return NULL;
77
78 if (HPDF_Xref_Add (xref, obj) != HPDF_OK)
79 return NULL;
80
81 if (HPDF_Dict_AddName (obj, "Type", "ExtGState") != HPDF_OK)
82 return NULL;
83
84 obj->header.obj_class |= HPDF_OSUBCLASS_EXT_GSTATE;
85
86 return obj;
87}
88
89
90HPDF_EXPORT(HPDF_STATUS)
91HPDF_ExtGState_SetAlphaStroke (HPDF_ExtGState ext_gstate,
92 HPDF_REAL value)
93{
94 HPDF_STATUS ret = ExtGState_Check (ext_gstate);
95
96 if (ret != HPDF_OK)
97 return ret;
98
99 if (value < 0 || value > 1.0f)
100 return HPDF_RaiseError (ext_gstate->error,
101 HPDF_EXT_GSTATE_OUT_OF_RANGE, 0);
102
103 return HPDF_Dict_AddReal (ext_gstate, "CA", value);
104}
105
106
107HPDF_EXPORT(HPDF_STATUS)
108HPDF_ExtGState_SetAlphaFill (HPDF_ExtGState ext_gstate,
109 HPDF_REAL value)
110{
111 HPDF_STATUS ret = ExtGState_Check (ext_gstate);
112
113 if (ret != HPDF_OK)
114 return ret;
115
116 if (value < 0 || value > 1.0f)
117 return HPDF_RaiseError (ext_gstate->error,
118 HPDF_EXT_GSTATE_OUT_OF_RANGE, 0);
119
120 return HPDF_Dict_AddReal (ext_gstate, "ca", value);
121}
122
123
124HPDF_EXPORT(HPDF_STATUS)
125HPDF_ExtGState_SetBlendMode (HPDF_ExtGState ext_gstate,
126 HPDF_BlendMode bmode)
127{
128 HPDF_STATUS ret = ExtGState_Check (ext_gstate);
129
130 if (ret != HPDF_OK)
131 return ret;
132
133 if ((int)bmode < 0 || (int)bmode > (int)HPDF_BM_EOF)
134 return HPDF_RaiseError (ext_gstate->error,
135 HPDF_EXT_GSTATE_OUT_OF_RANGE, 0);
136
137 return HPDF_Dict_AddName (ext_gstate, "BM", HPDF_BM_NAMES[(int)bmode]);
138}
139
140/*
141HPDF_STATUS
142HPDF_ExtGState_SetStrokeAdjustment (HPDF_ExtGState ext_gstate,
143 HPDF_BOOL value)
144{
145 HPDF_STATUS ret = ExtGState_Check (ext_gstate);
146
147 if (ret != HPDF_OK)
148 return ret;
149
150 return HPDF_Dict_AddBoolean (ext_gstate, "SA", value);
151}
152*/
153
154