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
|
// Copyright (C) 2002-2012 Nikolaus Gebhardt
// This file is part of the "Irrlicht Engine".
// For conditions of distribution and use, see copyright notice in irrlicht.h
#include "CImageWriterPNG.h"
#ifdef _IRR_COMPILE_WITH_PNG_WRITER_
#include "CImageLoaderPNG.h"
#include "CColorConverter.h"
#include "IWriteFile.h"
#include "irrString.h"
#include "os.h" // for logging
#ifdef _IRR_COMPILE_WITH_LIBPNG_
#ifndef _IRR_USE_NON_SYSTEM_LIB_PNG_
#include <png.h> // use system lib png
#else // _IRR_USE_NON_SYSTEM_LIB_PNG_
#include "libpng/png.h" // use irrlicht included lib png
#endif // _IRR_USE_NON_SYSTEM_LIB_PNG_
#endif // _IRR_COMPILE_WITH_LIBPNG_
namespace irr
{
namespace video
{
IImageWriter* createImageWriterPNG()
{
return new CImageWriterPNG;
}
#ifdef _IRR_COMPILE_WITH_LIBPNG_
// PNG function for error handling
static void png_cpexcept_error(png_structp png_ptr, png_const_charp msg)
{
os::Printer::log("PNG fatal error", msg, ELL_ERROR);
longjmp(png_jmpbuf(png_ptr), 1);
}
// PNG function for warning handling
static void png_cpexcept_warning(png_structp png_ptr, png_const_charp msg)
{
os::Printer::log("PNG warning", msg, ELL_WARNING);
}
// PNG function for file writing
void PNGAPI user_write_data_fcn(png_structp png_ptr, png_bytep data, png_size_t length)
{
png_size_t check;
io::IWriteFile* file=(io::IWriteFile*)png_get_io_ptr(png_ptr);
check=(png_size_t) file->write((const void*)data,(u32)length);
if (check != length)
png_error(png_ptr, "Write Error");
}
#endif // _IRR_COMPILE_WITH_LIBPNG_
CImageWriterPNG::CImageWriterPNG()
{
#ifdef _DEBUG
setDebugName("CImageWriterPNG");
#endif
}
bool CImageWriterPNG::isAWriteableFileExtension(const io::path& filename) const
{
#ifdef _IRR_COMPILE_WITH_LIBPNG_
return core::hasFileExtension ( filename, "png" );
#else
return false;
#endif
}
bool CImageWriterPNG::writeImage(io::IWriteFile* file, IImage* image,u32 param) const
{
#ifdef _IRR_COMPILE_WITH_LIBPNG_
if (!file || !image)
return false;
// Allocate the png write struct
png_structp png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING,
NULL, (png_error_ptr)png_cpexcept_error, (png_error_ptr)png_cpexcept_warning);
if (!png_ptr)
{
os::Printer::log("PNGWriter: Internal PNG create write struct failure\n", file->getFileName(), ELL_ERROR);
return false;
}
// Allocate the png info struct
png_infop info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr)
{
os::Printer::log("PNGWriter: Internal PNG create info struct failure\n", file->getFileName(), ELL_ERROR);
png_destroy_write_struct(&png_ptr, NULL);
return false;
}
// for proper error handling
if (setjmp(png_jmpbuf(png_ptr)))
{
png_destroy_write_struct(&png_ptr, &info_ptr);
return false;
}
png_set_write_fn(png_ptr, file, user_write_data_fcn, NULL);
// Set info
switch(image->getColorFormat())
{
case ECF_A8R8G8B8:
case ECF_A1R5G5B5:
png_set_IHDR(png_ptr, info_ptr,
image->getDimension().Width, image->getDimension().Height,
8, PNG_COLOR_TYPE_RGB_ALPHA, PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
break;
default:
png_set_IHDR(png_ptr, info_ptr,
image->getDimension().Width, image->getDimension().Height,
8, PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
}
s32 lineWidth = image->getDimension().Width;
switch(image->getColorFormat())
{
case ECF_R8G8B8:
case ECF_R5G6B5:
lineWidth*=3;
break;
case ECF_A8R8G8B8:
case ECF_A1R5G5B5:
lineWidth*=4;
break;
// TODO: Error handling in case of unsupported color format
default:
break;
}
u8* tmpImage = new u8[image->getDimension().Height*lineWidth];
if (!tmpImage)
{
os::Printer::log("PNGWriter: Internal PNG create image failure\n", file->getFileName(), ELL_ERROR);
png_destroy_write_struct(&png_ptr, &info_ptr);
return false;
}
u8* data = (u8*)image->lock();
switch(image->getColorFormat())
{
case ECF_R8G8B8:
CColorConverter::convert_R8G8B8toR8G8B8(data,image->getDimension().Height*image->getDimension().Width,tmpImage);
break;
case ECF_A8R8G8B8:
CColorConverter::convert_A8R8G8B8toA8R8G8B8(data,image->getDimension().Height*image->getDimension().Width,tmpImage);
break;
case ECF_R5G6B5:
CColorConverter::convert_R5G6B5toR8G8B8(data,image->getDimension().Height*image->getDimension().Width,tmpImage);
break;
case ECF_A1R5G5B5:
CColorConverter::convert_A1R5G5B5toA8R8G8B8(data,image->getDimension().Height*image->getDimension().Width,tmpImage);
break;
#ifndef _DEBUG
// TODO: Error handling in case of unsupported color format
default:
break;
#endif
}
image->unlock();
// Create array of pointers to rows in image data
//Used to point to image rows
u8** RowPointers = new png_bytep[image->getDimension().Height];
if (!RowPointers)
{
os::Printer::log("PNGWriter: Internal PNG create row pointers failure\n", file->getFileName(), ELL_ERROR);
png_destroy_write_struct(&png_ptr, &info_ptr);
delete [] tmpImage;
return false;
}
data=tmpImage;
// Fill array of pointers to rows in image data
for (u32 i=0; i<image->getDimension().Height; ++i)
{
RowPointers[i]=data;
data += lineWidth;
}
// for proper error handling
if (setjmp(png_jmpbuf(png_ptr)))
{
png_destroy_write_struct(&png_ptr, &info_ptr);
delete [] RowPointers;
delete [] tmpImage;
return false;
}
png_set_rows(png_ptr, info_ptr, RowPointers);
if (image->getColorFormat()==ECF_A8R8G8B8 || image->getColorFormat()==ECF_A1R5G5B5)
png_write_png(png_ptr, info_ptr, PNG_TRANSFORM_BGR, NULL);
else
{
png_write_png(png_ptr, info_ptr, PNG_TRANSFORM_IDENTITY, NULL);
}
delete [] RowPointers;
delete [] tmpImage;
png_destroy_write_struct(&png_ptr, &info_ptr);
return true;
#else
return false;
#endif
}
} // namespace video
} // namespace irr
#endif
|
