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
|
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
* svgloader.cc
*
* Mon May 1 11:03:39 CEST 2006
* Copyright 2006 Bent Bisballe Nyeng
* deva@aasimon.org
****************************************************************************/
/*
* This file is part of MIaV.
*
* MIaV is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* MIaV is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with MIaV; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include "svgloader.h"
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <cairo.h>
#include <svg.h>
#include <svg-cairo.h>
SVGLoader::SVGLoader()
{
}
SVGLoader::~SVGLoader()
{
}
/* load: This is what you're probably interested in!
* -----------------------------------------------------
* If width and height are greater than 0, the image will
* be scaled to that size. wscale and hscale would be ignored.
*
* If width and height are less than 1, wscale and hscale will
* resize the width and the height to the specified scales.
*
* If width and height are less than 1, and wscale and hscale
* are either 0 or 1, then the image will be loaded at it's
* natural size.
*
* See main() for examples.
*/
QImage SVGLoader::load(QString file, unsigned int width, unsigned int height, float wscale, float hscale) {
svg_cairo_t *scr;
int bpp;
int btpp;
unsigned int rwidth;
unsigned int rheight;
// Create the SVG cairo stuff.
svg_cairo_create(&scr);
svg_cairo_parse(scr, file.toStdString().c_str());
if (wscale <= 0) wscale=1;
if (hscale <= 0) hscale=1;
// Now get the width and height of the SVG content, so we can calculate
// and adjust our image dimensions
svg_cairo_get_size (scr, &rwidth, &rheight);
// Calculate final width and height of our surface based on the parameters passed
if (width > 0) {
if (rwidth>width) {
wscale=(float)width/(float)rwidth;
printf ("rwidth/width = %f\n", wscale);
} else {
wscale=(float)rwidth/(float)width;
printf ("width/wwidth = %f\n", wscale);
}
} else {
width=(int)(rwidth*wscale);
printf ("width = %i\n", width);
}
if (height > 0) {
if (rheight>height) {
hscale=(float)height/(float)rheight;
printf ("height/rheight = %f\n", hscale);
} else {
hscale=(float)rheight/(float)height;
printf ("rheight/height = %f\n", hscale);
}
} else {
height=(int)(rheight*hscale);
printf ("height = %i\n", height);
}
// We will create a CAIRO_FORMAT_ARGB32 surface. We don't need to match
// the screen SDL format, but we are interested in the alpha bit
bpp=32; // bits per pixel
btpp=4; // bytes per pixel
// scanline width
int stride=width * btpp;
// Allocate an image
unsigned char *image=(unsigned char*)calloc(stride*height, 1);
// Create the cairo surface with the adjusted width and height
cairo_surface_t *cairo_surface;
cairo_surface = cairo_image_surface_create_for_data(image, CAIRO_FORMAT_ARGB32,
width, height, stride);
cairo_t *cr = cairo_create(cairo_surface);
cairo_scale(cr, wscale, hscale);
// Render SVG to our surface
svg_cairo_render(scr, cr);
// Cleanup cairo
cairo_surface_destroy(cairo_surface);
cairo_destroy(cr);
// Destroy the svg_cairo structure
svg_cairo_destroy(scr);
// Create the QImage using the render buffer.
QImage qimage(image, width, height, QImage::Format_ARGB32);
return qimage;
}
|
