/
tiff_reader.cpp
274 lines (229 loc) · 6.85 KB
/
tiff_reader.cpp
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
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
/*****************************************************************************
*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2011 Artem Pavlenko
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*****************************************************************************/
// mapnik
#include <mapnik/debug.hpp>
#include <mapnik/image_reader.hpp>
#include <boost/filesystem/operations.hpp>
// stl
#include <iostream>
extern "C"
{
#include <tiffio.h>
}
namespace mapnik
{
using std::min;
using std::max;
class tiff_reader : public image_reader
{
private:
std::string file_name_;
int read_method_;
unsigned width_;
unsigned height_;
int rows_per_strip_;
int tile_width_;
int tile_height_;
public:
enum TiffType {
generic=1,
stripped,
tiled
};
explicit tiff_reader(const std::string& file_name);
virtual ~tiff_reader();
unsigned width() const;
unsigned height() const;
void read(unsigned x,unsigned y,image_data_32& image);
private:
tiff_reader(const tiff_reader&);
tiff_reader& operator=(const tiff_reader&);
void init();
void read_generic(unsigned x,unsigned y,image_data_32& image);
void read_stripped(unsigned x,unsigned y,image_data_32& image);
void read_tiled(unsigned x,unsigned y,image_data_32& image);
TIFF* load_if_exists(const std::string& filename);
};
namespace
{
image_reader* create_tiff_reader(const std::string& file)
{
return new tiff_reader(file);
}
const bool registered = register_image_reader("tiff",create_tiff_reader);
}
tiff_reader::tiff_reader(const std::string& file_name)
: file_name_(file_name),
read_method_(generic),
width_(0),
height_(0),
rows_per_strip_(0),
tile_width_(0),
tile_height_(0)
{
init();
}
void tiff_reader::init()
{
// TODO: error handling
TIFFSetWarningHandler(0);
TIFF* tif = load_if_exists(file_name_);
if (!tif) throw image_reader_exception( std::string("Can't load tiff file: '") + file_name_ + "'");
char msg[1024];
if (TIFFRGBAImageOK(tif,msg))
{
TIFFGetField(tif, TIFFTAG_IMAGEWIDTH, &width_);
TIFFGetField(tif, TIFFTAG_IMAGELENGTH, &height_);
if (TIFFIsTiled(tif))
{
TIFFGetField(tif, TIFFTAG_TILEWIDTH, &tile_width_);
TIFFGetField(tif, TIFFTAG_TILELENGTH, &tile_height_);
read_method_=tiled;
}
else if (TIFFGetField(tif,TIFFTAG_ROWSPERSTRIP,&rows_per_strip_)!=0)
{
read_method_=stripped;
}
TIFFClose(tif);
}
else
{
TIFFClose(tif);
throw image_reader_exception(msg);
}
}
tiff_reader::~tiff_reader()
{
//
}
unsigned tiff_reader::width() const
{
return width_;
}
unsigned tiff_reader::height() const
{
return height_;
}
void tiff_reader::read(unsigned x,unsigned y,image_data_32& image)
{
if (read_method_==stripped)
{
read_stripped(x,y,image);
}
else if (read_method_==tiled)
{
read_tiled(x,y,image);
}
else
{
read_generic(x,y,image);
}
}
void tiff_reader::read_generic(unsigned /*x*/,unsigned /*y*/,image_data_32& /*image*/)
{
TIFF* tif = load_if_exists(file_name_);
if (tif)
{
MAPNIK_LOG_DEBUG(tiff_reader) << "tiff_reader: TODO - tiff is not stripped or tiled";
TIFFClose(tif);
}
}
void tiff_reader::read_tiled(unsigned x0,unsigned y0,image_data_32& image)
{
TIFF* tif = load_if_exists(file_name_);
if (tif)
{
uint32* buf = (uint32*)_TIFFmalloc(tile_width_*tile_height_*sizeof(uint32));
int width=image.width();
int height=image.height();
int start_y=(y0/tile_height_)*tile_height_;
int end_y=((y0+height)/tile_height_+1)*tile_height_;
int start_x=(x0/tile_width_)*tile_width_;
int end_x=((x0+width)/tile_width_+1)*tile_width_;
int row,tx0,tx1,ty0,ty1;
for (int y=start_y;y<end_y;y+=tile_height_)
{
ty0 = max(y0,(unsigned)y) - y;
ty1 = min(height+y0,(unsigned)(y+tile_height_)) - y;
int n0=tile_height_-ty1;
int n1=tile_height_-ty0-1;
for (int x=start_x;x<end_x;x+=tile_width_)
{
if (!TIFFReadRGBATile(tif,x,y,buf)) break;
tx0=max(x0,(unsigned)x);
tx1=min(width+x0,(unsigned)(x+tile_width_));
row=y+ty0-y0;
for (int n=n1;n>=n0;--n)
{
image.setRow(row,tx0-x0,tx1-x0,(const unsigned*)&buf[n*tile_width_+tx0-x]);
++row;
}
}
}
_TIFFfree(buf);
TIFFClose(tif);
}
}
void tiff_reader::read_stripped(unsigned x0,unsigned y0,image_data_32& image)
{
TIFF* tif = load_if_exists(file_name_);
if (tif)
{
uint32* buf = (uint32*)_TIFFmalloc(width_*rows_per_strip_*sizeof(uint32));
int width=image.width();
int height=image.height();
unsigned start_y=(y0/rows_per_strip_)*rows_per_strip_;
unsigned end_y=((y0+height)/rows_per_strip_+1)*rows_per_strip_;
bool laststrip=((unsigned)end_y > height_)?true:false;
int row,tx0,tx1,ty0,ty1;
tx0=x0;
tx1=min(width+x0,(unsigned)width_);
for (unsigned y=start_y; y < end_y; y+=rows_per_strip_)
{
ty0 = max(y0,y)-y;
ty1 = min(height+y0,y+rows_per_strip_)-y;
if (!TIFFReadRGBAStrip(tif,y,buf)) break;
row=y+ty0-y0;
int n0=laststrip ? 0:(rows_per_strip_-ty1);
int n1=laststrip ? (ty1-ty0-1):(rows_per_strip_-ty0-1);
for (int n=n1;n>=n0;--n)
{
image.setRow(row,tx0-x0,tx1-x0,(const unsigned*)&buf[n*width_+tx0]);
++row;
}
}
_TIFFfree(buf);
TIFFClose(tif);
}
}
TIFF* tiff_reader::load_if_exists(std::string const& filename)
{
TIFF * tif = 0;
boost::filesystem::path path(file_name_);
if (exists(path)) // && is_regular(path)) { -- not supported in boost-1.33.*
{
// File path is a full file path and does exist
tif = TIFFOpen(filename.c_str(), "rb");
}
return tif;
}
}