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
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
|
/* Python.h should always be first */
#include <Python.h>
#include <cairo/cairo.h>
#include <cairo/cairo-pdf.h>
#include <cairo/cairo-ps.h>
#include <cairo/cairo-svg.h>
#include <stdio.h>
#include <string.h>
#include "grdel.h"
#include "cferbind.h"
#include "cairoCFerBind.h"
/*
* Creates the Cairo Surface and Context for this image.
*
* Returns one if successful. If an error occurs, grdelerrmsg
* is assigned an appropriate error message and zero is returned.
*/
grdelBool cairoCFerBind_createSurface(CFerBind *self)
{
CairoCFerBindData *instdata;
char *fmtname;
double width;
double height;
cairo_rectangle_t extents;
/* Sanity check */
if ( (self->enginename != CairoCFerBindName) &&
(self->enginename != PyQtCairoCFerBindName) ) {
strcpy(grdelerrmsg, "cairoCFerBind_createSurface: unexpected error, "
"self is not a valid CFerBind struct");
return 0;
}
instdata = (CairoCFerBindData *) self->instancedata;
/* Create the surface if it does not exist */
if ( instdata->surface == NULL ) {
/*
* Sanity check: the context includes the surface, but cairoCFerBind
* also maintains a separate reference to the surface; thus, if there
* is no surface, there should not be a context.
*/
if ( instdata->context != NULL ) {
strcpy(grdelerrmsg, "cairoCFerBind_createSurface: unexpected error, "
"NULL surface but non-NULL context");
return 0;
}
/* Create the appropriate surface */
switch( instdata->imageformat ) {
case CCFBIF_PNG:
/* Surface size is given in integer pixels */
if ( instdata->noalpha )
instdata->surface = cairo_image_surface_create(CAIRO_FORMAT_RGB24,
instdata->imagewidth, instdata->imageheight);
else
instdata->surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32,
instdata->imagewidth, instdata->imageheight);
/* Note that all surface values are initialized to zero (transparent) */
fmtname = "PNG";
break;
case CCFBIF_PDF:
/* Surface size is given in (floating-point) points */
width = instdata->imagewidth * 72.0 / instdata->pixelsperinch;
height = instdata->imageheight * 72.0 / instdata->pixelsperinch;
instdata->surface = cairo_pdf_surface_create(instdata->imagename, width, height);
/* Never use the alpha channel to avoid embedded image */
instdata->noalpha = 1;
fmtname = "PDF";
break;
case CCFBIF_PS:
/* Surface size is given in (floating-point) points */
width = instdata->imagewidth * 72.0 / instdata->pixelsperinch;
height = instdata->imageheight * 72.0 / instdata->pixelsperinch;
if ( width > height ) {
/*
* Landscape orientation
* Swap width and height and then translate and rotate (see
* below) per Cairo requirements.
*/
instdata->surface = cairo_ps_surface_create(instdata->imagename, height, width);
}
else {
/* Portrait orientation */
instdata->surface = cairo_ps_surface_create(instdata->imagename, width, height);
}
/* Never use the alpha channel to avoid embedded image */
instdata->noalpha = 1;
fmtname = "PS";
break;
case CCFBIF_SVG:
/* Surface size is given in (floating-point) points */
width = instdata->imagewidth * 72.0 / instdata->pixelsperinch;
height = instdata->imageheight * 72.0 / instdata->pixelsperinch;
instdata->surface = cairo_svg_surface_create(instdata->imagename, width, height);
fmtname = "SVG";
break;
case CCFBIF_REC:
/* Values will be given in (floating-point) points */
extents.x = 0.0;
extents.y = 0.0;
extents.width = instdata->imagewidth * 72.0 / instdata->pixelsperinch;
extents.height = height = instdata->imageheight * 72.0 / instdata->pixelsperinch;
#ifdef CAIRO_HAS_RECORDING_SURFACE
instdata->surface = cairo_recording_surface_create(CAIRO_CONTENT_COLOR_ALPHA, &extents);
#else
instdata->surface = cairo_svg_surface_create_for_stream(NULL, NULL, extents.width, extents.height);
#endif
fmtname = "recording";
break;
default:
sprintf(grdelerrmsg, "cairoCFerBind_createSurface: unexpected error, "
"unknown imageformat %d", instdata->imageformat);
return 0;
}
/* Check for failure to create the surface */
if ( cairo_surface_status(instdata->surface) != CAIRO_STATUS_SUCCESS ) {
sprintf(grdelerrmsg, "cairoCFerBind_createSurface: "
"problems creating a %s surface", fmtname);
cairo_surface_destroy(instdata->surface);
instdata->surface = NULL;
return 0;
}
}
/* Create the Context if it does not exist */
if ( instdata->context == NULL ) {
instdata->context = cairo_create(instdata->surface);
if ( cairo_status(instdata->context) != CAIRO_STATUS_SUCCESS ) {
strcpy(grdelerrmsg, "cairoCFerBind_createSurface: "
"problems creating a context from a surface");
cairo_destroy(instdata->context);
instdata->context = NULL;
cairo_surface_finish(instdata->surface);
cairo_surface_destroy(instdata->surface);
instdata->surface = NULL;
return 0;
}
/*
* If landscape PostScript, translate and rotate the coordinate system
* to correct for swapped width and height (per Cairo requirements).
*/
if ( instdata->imageformat == CCFBIF_PS ) {
width = instdata->imagewidth * 72.0 / instdata->pixelsperinch;
height = instdata->imageheight * 72.0 / instdata->pixelsperinch;
if ( width > height ) {
/* surface was created with coordinates (0,0) to (height, width) */
cairo_matrix_t transmat;
/* Add a "comment" telling PostScript it is landscape */
cairo_ps_surface_dsc_begin_page_setup(instdata->surface);
cairo_ps_surface_dsc_comment(instdata->surface,
"%%PageOrientation: Landscape");
/* Translate and rotate 90 degrees */
cairo_matrix_init(&transmat, 0.0, -1.0, 1.0, 0.0, 0.0, width);
cairo_set_matrix(instdata->context, &transmat);
/*
* The transformed coordinate system goes from (0,0) at the top
* left corner to (width, height) at the bottom right corner.
*/
}
else {
/* Add a "comment" telling PostScript it is portrait */
cairo_ps_surface_dsc_begin_page_setup(instdata->surface);
cairo_ps_surface_dsc_comment(instdata->surface,
"%%PageOrientation: Portrait");
}
}
/* Set the antialiasing state in the context */
if ( instdata->antialias )
cairo_set_antialias(instdata->context, CAIRO_ANTIALIAS_DEFAULT);
else
cairo_set_antialias(instdata->context, CAIRO_ANTIALIAS_NONE);
/* Set the appropriate clipping rectangle (if any) */
if ( ! cairoCFerBind_clipView(self, instdata->clipit) ) {
/* grdelerrmsg appropriately assigned */
return 0;
}
}
return 1;
}
|
