/[pcsx2_0.9.7]/trunk/3rdparty/wxWidgets/src/common/anidecod.cpp
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Contents of /trunk/3rdparty/wxWidgets/src/common/anidecod.cpp

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Revision 31 - (show annotations) (download)
Tue Sep 7 03:24:11 2010 UTC (10 years, 2 months ago) by william
File size: 9858 byte(s)
committing r3113 initial commit again...
1 /////////////////////////////////////////////////////////////////////////////
2 // Name: src/common/anidecod.cpp
3 // Purpose: wxANIDecoder, ANI reader for wxImage and wxAnimation
4 // Author: Francesco Montorsi
5 // RCS-ID: $Id: anidecod.cpp 43898 2006-12-10 14:18:37Z VZ $
6 // Copyright: (c) Francesco Montorsi
7 // Licence: wxWindows licence
8 /////////////////////////////////////////////////////////////////////////////
9
10 // For compilers that support precompilation, includes "wx.h".
11 #include "wx/wxprec.h"
12
13 #ifdef __BORLANDC__
14 #pragma hdrstop
15 #endif
16
17 #if wxUSE_STREAMS && wxUSE_ICO_CUR
18
19 #include "wx/anidecod.h"
20
21 #ifndef WX_PRECOMP
22 #include "wx/palette.h"
23 #endif
24
25 #include <stdlib.h>
26 #include <string.h>
27
28 // static
29 wxCURHandler wxANIDecoder::sm_handler;
30
31 //---------------------------------------------------------------------------
32 // wxANIFrameInfo
33 //---------------------------------------------------------------------------
34
35 class wxANIFrameInfo
36 {
37 public:
38 wxANIFrameInfo(unsigned int delay = 0, int idx = -1)
39 { m_delay=delay; m_imageIndex=idx; }
40
41 unsigned int m_delay;
42 int m_imageIndex;
43 };
44
45 #include "wx/arrimpl.cpp" // this is a magic incantation which must be done!
46 WX_DEFINE_OBJARRAY(wxImageArray)
47
48 #include "wx/arrimpl.cpp" // this is a magic incantation which must be done!
49 WX_DEFINE_OBJARRAY(wxANIFrameInfoArray)
50
51
52 //---------------------------------------------------------------------------
53 // wxANIDecoder
54 //---------------------------------------------------------------------------
55
56 wxANIDecoder::wxANIDecoder()
57 {
58 }
59
60 wxANIDecoder::~wxANIDecoder()
61 {
62 }
63
64 bool wxANIDecoder::ConvertToImage(unsigned int frame, wxImage *image) const
65 {
66 unsigned int idx = m_info[frame].m_imageIndex;
67 *image = m_images[idx]; // copy
68 return image->IsOk();
69 }
70
71
72 //---------------------------------------------------------------------------
73 // Data accessors
74 //---------------------------------------------------------------------------
75
76 wxSize wxANIDecoder::GetFrameSize(unsigned int WXUNUSED(frame)) const
77 {
78 // all frames are of the same size...
79 return m_szAnimation;
80 }
81
82 wxPoint wxANIDecoder::GetFramePosition(unsigned int WXUNUSED(frame)) const
83 {
84 // all frames are of the same size...
85 return wxPoint(0,0);
86 }
87
88 wxAnimationDisposal wxANIDecoder::GetDisposalMethod(unsigned int WXUNUSED(frame)) const
89 {
90 // this disposal is implicit for all frames inside an ANI file
91 return wxANIM_TOBACKGROUND;
92 }
93
94 long wxANIDecoder::GetDelay(unsigned int frame) const
95 {
96 return m_info[frame].m_delay;
97 }
98
99 wxColour wxANIDecoder::GetTransparentColour(unsigned int frame) const
100 {
101 unsigned int idx = m_info[frame].m_imageIndex;
102
103 if (!m_images[idx].HasMask())
104 return wxNullColour;
105
106 return wxColour(m_images[idx].GetMaskRed(),
107 m_images[idx].GetMaskGreen(),
108 m_images[idx].GetMaskBlue());
109 }
110
111
112 //---------------------------------------------------------------------------
113 // ANI reading and decoding
114 //---------------------------------------------------------------------------
115
116 bool wxANIDecoder::CanRead(wxInputStream& stream) const
117 {
118 wxInt32 FCC1, FCC2;
119 wxUint32 datalen ;
120
121 wxInt32 riff32;
122 memcpy( &riff32, "RIFF", 4 );
123 wxInt32 list32;
124 memcpy( &list32, "LIST", 4 );
125 wxInt32 ico32;
126 memcpy( &ico32, "icon", 4 );
127 wxInt32 anih32;
128 memcpy( &anih32, "anih", 4 );
129
130 stream.SeekI(0);
131 if ( !stream.Read(&FCC1, 4) )
132 return false;
133
134 if ( FCC1 != riff32 )
135 return false;
136
137 // we have a riff file:
138 while ( stream.IsOk() )
139 {
140 if ( FCC1 == anih32 )
141 return true; // found the ANIH chunk - this should be an ANI file
142
143 // we always have a data size:
144 stream.Read(&datalen, 4);
145 datalen = wxINT32_SWAP_ON_BE(datalen) ;
146
147 // data should be padded to make even number of bytes
148 if (datalen % 2 == 1) datalen ++ ;
149
150 // now either data or a FCC:
151 if ( (FCC1 == riff32) || (FCC1 == list32) )
152 {
153 stream.Read(&FCC2, 4);
154 }
155 else
156 {
157 stream.SeekI(stream.TellI() + datalen);
158 }
159
160 // try to read next data chunk:
161 if ( !stream.Read(&FCC1, 4) )
162 {
163 // reading failed -- either EOF or IO error, bail out anyhow
164 return false;
165 }
166 }
167
168 return false;
169 }
170
171 // the "anih" RIFF chunk
172 struct wxANIHeader
173 {
174 wxInt32 cbSizeOf; // Num bytes in AniHeader (36 bytes)
175 wxInt32 cFrames; // Number of unique Icons in this cursor
176 wxInt32 cSteps; // Number of Blits before the animation cycles
177 wxInt32 cx; // width of the frames
178 wxInt32 cy; // height of the frames
179 wxInt32 cBitCount; // bit depth
180 wxInt32 cPlanes; // 1
181 wxInt32 JifRate; // Default Jiffies (1/60th of a second) if rate chunk not present.
182 wxInt32 flags; // Animation Flag (see AF_ constants)
183
184 // ANI files are always little endian so we need to swap bytes on big
185 // endian architectures
186 #ifdef WORDS_BIGENDIAN
187 void AdjustEndianness()
188 {
189 // this works because all our fields are wxInt32 and they must be
190 // packed without holes between them (if they're not, they wouldn't map
191 // to the file header!)
192 wxInt32 * const start = (wxInt32 *)this;
193 wxInt32 * const end = start + sizeof(wxANIHeader)/sizeof(wxInt32);
194 for ( wxInt32 *p = start; p != end; p++ )
195 {
196 *p = wxINT32_SWAP_ALWAYS(*p);
197 }
198 }
199 #else
200 void AdjustEndianness() { }
201 #endif
202 };
203
204 bool wxANIDecoder::Load( wxInputStream& stream )
205 {
206 wxInt32 FCC1, FCC2;
207 wxUint32 datalen;
208 unsigned int globaldelay=0;
209
210 wxInt32 riff32;
211 memcpy( &riff32, "RIFF", 4 );
212 wxInt32 list32;
213 memcpy( &list32, "LIST", 4 );
214 wxInt32 ico32;
215 memcpy( &ico32, "icon", 4 );
216 wxInt32 anih32;
217 memcpy( &anih32, "anih", 4 );
218 wxInt32 rate32;
219 memcpy( &rate32, "rate", 4 );
220 wxInt32 seq32;
221 memcpy( &seq32, "seq ", 4 );
222
223 stream.SeekI(0);
224 stream.Read(&FCC1, 4);
225 if ( FCC1 != riff32 )
226 return false;
227
228 m_nFrames = 0;
229 m_szAnimation = wxDefaultSize;
230
231 m_images.Clear();
232 m_info.Clear();
233
234 // we have a riff file:
235 while ( stream.IsOk() )
236 {
237 // we always have a data size:
238 stream.Read(&datalen, 4);
239 datalen = wxINT32_SWAP_ON_BE(datalen);
240
241 //data should be padded to make even number of bytes
242 if (datalen % 2 == 1) datalen++;
243
244 // now either data or a FCC:
245 if ( (FCC1 == riff32) || (FCC1 == list32) )
246 {
247 stream.Read(&FCC2, 4);
248 }
249 else if ( FCC1 == anih32 )
250 {
251 if ( datalen != sizeof(wxANIHeader) )
252 return false;
253
254 if (m_nFrames > 0)
255 return false; // already parsed an ani header?
256
257 struct wxANIHeader header;
258 stream.Read(&header, sizeof(wxANIHeader));
259 header.AdjustEndianness();
260
261 // we should have a global frame size
262 m_szAnimation = wxSize(header.cx, header.cy);
263
264 // save interesting info from the header
265 m_nFrames = header.cSteps; // NB: not cFrames!!
266 if ( m_nFrames == 0 )
267 return false;
268
269 globaldelay = header.JifRate * 1000 / 60;
270
271 m_images.Alloc(header.cFrames);
272 m_info.Add(wxANIFrameInfo(), m_nFrames);
273 }
274 else if ( FCC1 == rate32 )
275 {
276 // did we already process the anih32 chunk?
277 if (m_nFrames == 0)
278 return false; // rate chunks should always be placed after anih chunk
279
280 wxASSERT(m_info.GetCount() == m_nFrames);
281 for (unsigned int i=0; i<m_nFrames; i++)
282 {
283 stream.Read(&FCC2, 4);
284 m_info[i].m_delay = wxINT32_SWAP_ON_BE(FCC2) * 1000 / 60;
285 }
286 }
287 else if ( FCC1 == seq32 )
288 {
289 // did we already process the anih32 chunk?
290 if (m_nFrames == 0)
291 return false; // seq chunks should always be placed after anih chunk
292
293 wxASSERT(m_info.GetCount() == m_nFrames);
294 for (unsigned int i=0; i<m_nFrames; i++)
295 {
296 stream.Read(&FCC2, 4);
297 m_info[i].m_imageIndex = wxINT32_SWAP_ON_BE(FCC2);
298 }
299 }
300 else if ( FCC1 == ico32 )
301 {
302 // use DoLoadFile() and not LoadFile()!
303 wxImage image;
304 if (!sm_handler.DoLoadFile(&image, stream, false /* verbose */, -1))
305 return false;
306
307 m_images.Add(image);
308 }
309 else
310 {
311 stream.SeekI(stream.TellI() + datalen);
312 }
313
314 // try to read next data chunk:
315 stream.Read(&FCC1, 4);
316 }
317
318 if (m_nFrames==0)
319 return false;
320
321 if (m_nFrames==m_images.GetCount())
322 {
323 // if no SEQ chunk is available, display the frames in the order
324 // they were loaded
325 for (unsigned int i=0; i<m_nFrames; i++)
326 if (m_info[i].m_imageIndex == -1)
327 m_info[i].m_imageIndex = i;
328 }
329
330 // if some frame has an invalid delay, use the global delay given in the
331 // ANI header
332 for (unsigned int i=0; i<m_nFrames; i++)
333 if (m_info[i].m_delay == 0)
334 m_info[i].m_delay = globaldelay;
335
336 // if the header did not contain a valid frame size, try to grab
337 // it from the size of the first frame (all frames are of the same size)
338 if (m_szAnimation.GetWidth() == 0 ||
339 m_szAnimation.GetHeight() == 0)
340 m_szAnimation = wxSize(m_images[0].GetWidth(), m_images[0].GetHeight());
341
342 return m_szAnimation != wxDefaultSize;
343 }
344
345 #endif // wxUSE_STREAMS && wxUSE_ICO_CUR

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