1 /*
2 * R : A Computer Language for Statistical Data Analysis
3 * Copyright (C) 2011-2014 The R Core Team
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, a copy is available at
17 * https://www.R-project.org/Licenses/
18 */
19
20 #ifdef HAVE_CONFIG_H
21 #include <config.h>
22 #endif
23
24 #include <Defn.h>
25
26
27 #include <R_ext/Rdynload.h>
28 int R_cairoCdynload(int local, int now);
29
30 typedef SEXP (*R_cairo)(SEXP args);
31 typedef SEXP (*R_cairoVersion_t)(void);
32 typedef SEXP (*R_pangoVersion_t)(void);
33 typedef SEXP (*R_cairoFT_t)(void);
34
35 static R_cairo R_devCairo;
36 static R_cairoVersion_t R_cairoVersion;
37 static R_pangoVersion_t R_pangoVersion;
38 static R_cairoFT_t R_cairoFT;
39
Load_Rcairo_Dll(void)40 static int Load_Rcairo_Dll(void)
41 {
42 static int initialized = 0;
43
44 if (initialized) return initialized;
45 initialized = -1;
46
47 int res = R_cairoCdynload(1, 1);
48 if(!res) return initialized;
49 R_devCairo = (R_cairo) R_FindSymbol("in_Cairo", "cairo", NULL);
50 if (!R_devCairo) error("failed to load cairo DLL");
51 R_cairoVersion = (R_cairoVersion_t) R_FindSymbol("in_CairoVersion", "cairo", NULL);
52 R_pangoVersion = (R_pangoVersion_t) R_FindSymbol("in_PangoVersion", "cairo", NULL);
53 R_cairoFT = (R_cairoFT_t) R_FindSymbol("in_CairoFT", "cairo", NULL);
54 initialized = 1;
55 return initialized;
56 }
57
58
devCairo(SEXP args)59 SEXP devCairo(SEXP args)
60 {
61 if (Load_Rcairo_Dll() < 0) warning("failed to load cairo DLL");
62 else (R_devCairo)(args);
63 return R_NilValue;
64 }
65
cairoVersion(void)66 SEXP cairoVersion(void)
67 {
68 #ifdef HAVE_WORKING_CAIRO
69 if (Load_Rcairo_Dll() < 0) return mkString("");
70 else return (R_cairoVersion)();
71 #else
72 return mkString("");
73 #endif
74 }
75
pangoVersion(void)76 SEXP pangoVersion(void)
77 {
78 #ifdef HAVE_WORKING_CAIRO
79 if (Load_Rcairo_Dll() < 0) return mkString("");
80 else return (R_pangoVersion)();
81 #else
82 return mkString("");
83 #endif
84 }
85
cairoFT(void)86 SEXP cairoFT(void)
87 {
88 #ifdef HAVE_WORKING_CAIRO
89 if (Load_Rcairo_Dll() < 0) return mkString("");
90 else return (R_cairoFT)();
91 #else
92 return mkString("");
93 #endif
94 }
95