aboutsummaryrefslogtreecommitdiffstatshomepage
path: root/src/others/irrlicht-1.8.1/source/Irrlicht/CImageLoaderBMP.cpp
blob: 2ccb64ccaea4e7d584f65f35ed86c7912b73d6a9 (plain)
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
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
// 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 "CImageLoaderBMP.h"

#ifdef _IRR_COMPILE_WITH_BMP_LOADER_

#include "IReadFile.h"
#include "SColor.h"
#include "CColorConverter.h"
#include "CImage.h"
#include "os.h"
#include "irrString.h"

namespace irr
{
namespace video
{


//! constructor
CImageLoaderBMP::CImageLoaderBMP()
{
	#ifdef _DEBUG
	setDebugName("CImageLoaderBMP");
	#endif
}


//! returns true if the file maybe is able to be loaded by this class
//! based on the file extension (e.g. ".tga")
bool CImageLoaderBMP::isALoadableFileExtension(const io::path& filename) const
{
	return core::hasFileExtension ( filename, "bmp" );
}


//! returns true if the file maybe is able to be loaded by this class
bool CImageLoaderBMP::isALoadableFileFormat(io::IReadFile* file) const
{
	u16 headerID;
	file->read(&headerID, sizeof(u16));
#ifdef __BIG_ENDIAN__
	headerID = os::Byteswap::byteswap(headerID);
#endif
	return headerID == 0x4d42;
}


void CImageLoaderBMP::decompress8BitRLE(u8*& bmpData, s32 size, s32 width, s32 height, s32 pitch) const
{
	u8* p = bmpData;
	u8* newBmp = new u8[(width+pitch)*height];
	u8* d = newBmp;
	u8* destEnd = newBmp + (width+pitch)*height;
	s32 line = 0;

	while (bmpData - p < size && d < destEnd)
	{
		if (*p == 0)
		{
			++p;

			switch(*p)
			{
			case 0: // end of line
				++p;
				++line;
				d = newBmp + (line*(width+pitch));
				break;
			case 1: // end of bmp
				delete [] bmpData;
				bmpData = newBmp;
				return;
			case 2:
				++p; d +=(u8)*p;  // delta
				++p; d += ((u8)*p)*(width+pitch);
				++p;
				break;
			default:
				{
					// absolute mode
					s32 count = (u8)*p; ++p;
					s32 readAdditional = ((2-(count%2))%2);
					s32 i;

					for (i=0; i<count; ++i)
					{
						*d = *p;
						++p;
						++d;
					}

					for (i=0; i<readAdditional; ++i)
						++p;
				}
			}
		}
		else
		{
			s32 count = (u8)*p; ++p;
			u8 color = *p; ++p;
			for (s32 i=0; i<count; ++i)
			{
				*d = color;
				++d;
			}
		}
	}

	delete [] bmpData;
	bmpData = newBmp;
}


void CImageLoaderBMP::decompress4BitRLE(u8*& bmpData, s32 size, s32 width, s32 height, s32 pitch) const
{
	s32 lineWidth = (width+1)/2+pitch;
	u8* p = bmpData;
	u8* newBmp = new u8[lineWidth*height];
	u8* d = newBmp;
	u8* destEnd = newBmp + lineWidth*height;
	s32 line = 0;
	s32 shift = 4;

	while (bmpData - p < size && d < destEnd)
	{
		if (*p == 0)
		{
			++p;

			switch(*p)
			{
			case 0: // end of line
				++p;
				++line;
				d = newBmp + (line*lineWidth);
				shift = 4;
				break;
			case 1: // end of bmp
				delete [] bmpData;
				bmpData = newBmp;
				return;
			case 2:
				{
					++p;
					s32 x = (u8)*p; ++p;
					s32 y = (u8)*p; ++p;
					d += x/2 + y*lineWidth;
					shift = x%2==0 ? 4 : 0;
				}
				break;
			default:
				{
					// absolute mode
					s32 count = (u8)*p; ++p;
					s32 readAdditional = ((2-((count)%2))%2);
					s32 readShift = 4;
					s32 i;

					for (i=0; i<count; ++i)
					{
						s32 color = (((u8)*p) >> readShift) & 0x0f;
						readShift -= 4;
						if (readShift < 0)
						{
							++*p;
							readShift = 4;
						}

						u8 mask = 0x0f << shift;
						*d = (*d & (~mask)) | ((color << shift) & mask);

						shift -= 4;
						if (shift < 0)
						{
							shift = 4;
							++d;
						}

					}

					for (i=0; i<readAdditional; ++i)
						++p;
				}
			}
		}
		else
		{
			s32 count = (u8)*p; ++p;
			s32 color1 = (u8)*p; color1 = color1 & 0x0f;
			s32 color2 = (u8)*p; color2 = (color2 >> 4) & 0x0f;
			++p;

			for (s32 i=0; i<count; ++i)
			{
				u8 mask = 0x0f << shift;
				u8 toSet = (shift==0 ? color1 : color2) << shift;
				*d = (*d & (~mask)) | (toSet & mask);

				shift -= 4;
				if (shift < 0)
				{
					shift = 4;
					++d;
				}
			}
		}
	}

	delete [] bmpData;
	bmpData = newBmp;
}



//! creates a surface from the file
IImage* CImageLoaderBMP::loadImage(io::IReadFile* file) const
{
	SBMPHeader header;

	file->read(&header, sizeof(header));

#ifdef __BIG_ENDIAN__
	header.Id = os::Byteswap::byteswap(header.Id);
	header.FileSize = os::Byteswap::byteswap(header.FileSize);
	header.BitmapDataOffset = os::Byteswap::byteswap(header.BitmapDataOffset);
	header.BitmapHeaderSize = os::Byteswap::byteswap(header.BitmapHeaderSize);
	header.Width = os::Byteswap::byteswap(header.Width);
	header.Height = os::Byteswap::byteswap(header.Height);
	header.Planes = os::Byteswap::byteswap(header.Planes);
	header.BPP = os::Byteswap::byteswap(header.BPP);
	header.Compression = os::Byteswap::byteswap(header.Compression);
	header.BitmapDataSize = os::Byteswap::byteswap(header.BitmapDataSize);
	header.PixelPerMeterX = os::Byteswap::byteswap(header.PixelPerMeterX);
	header.PixelPerMeterY = os::Byteswap::byteswap(header.PixelPerMeterY);
	header.Colors = os::Byteswap::byteswap(header.Colors);
	header.ImportantColors = os::Byteswap::byteswap(header.ImportantColors);
#endif

	s32 pitch = 0;

	//! return if the header is false

	if (header.Id != 0x4d42)
		return 0;

	if (header.Compression > 2) // we'll only handle RLE-Compression
	{
		os::Printer::log("Compression mode not supported.", ELL_ERROR);
		return 0;
	}

	// adjust bitmap data size to dword boundary
	header.BitmapDataSize += (4-(header.BitmapDataSize%4))%4;

	// read palette

	long pos = file->getPos();
	s32 paletteSize = (header.BitmapDataOffset - pos) / 4;

	s32* paletteData = 0;
	if (paletteSize)
	{
		paletteData = new s32[paletteSize];
		file->read(paletteData, paletteSize * sizeof(s32));
#ifdef __BIG_ENDIAN__
		for (s32 i=0; i<paletteSize; ++i)
			paletteData[i] = os::Byteswap::byteswap(paletteData[i]);
#endif
	}

	// read image data

	if (!header.BitmapDataSize)
	{
		// okay, lets guess the size
		// some tools simply don't set it
		header.BitmapDataSize = static_cast<u32>(file->getSize()) - header.BitmapDataOffset;
	}

	file->seek(header.BitmapDataOffset);

	f32 t = (header.Width) * (header.BPP / 8.0f);
	s32 widthInBytes = (s32)t;
	t -= widthInBytes;
	if (t!=0.0f)
		++widthInBytes;

	s32 lineData = widthInBytes + ((4-(widthInBytes%4)))%4;
	pitch = lineData - widthInBytes;

	u8* bmpData = new u8[header.BitmapDataSize];
	file->read(bmpData, header.BitmapDataSize);

	// decompress data if needed
	switch(header.Compression)
	{
	case 1: // 8 bit rle
		decompress8BitRLE(bmpData, header.BitmapDataSize, header.Width, header.Height, pitch);
		break;
	case 2: // 4 bit rle
		decompress4BitRLE(bmpData, header.BitmapDataSize, header.Width, header.Height, pitch);
		break;
	}

	// create surface

	// no default constructor from packed area! ARM problem!
	core::dimension2d<u32> dim;
	dim.Width = header.Width;
	dim.Height = header.Height;

	IImage* image = 0;
	switch(header.BPP)
	{
	case 1:
		image = new CImage(ECF_A1R5G5B5, dim);
		if (image)
			CColorConverter::convert1BitTo16Bit(bmpData, (s16*)image->lock(), header.Width, header.Height, pitch, true);
		break;
	case 4:
		image = new CImage(ECF_A1R5G5B5, dim);
		if (image)
			CColorConverter::convert4BitTo16Bit(bmpData, (s16*)image->lock(), header.Width, header.Height, paletteData, pitch, true);
		break;
	case 8:
		image = new CImage(ECF_A1R5G5B5, dim);
		if (image)
			CColorConverter::convert8BitTo16Bit(bmpData, (s16*)image->lock(), header.Width, header.Height, paletteData, pitch, true);
		break;
	case 16:
		image = new CImage(ECF_A1R5G5B5, dim);
		if (image)
			CColorConverter::convert16BitTo16Bit((s16*)bmpData, (s16*)image->lock(), header.Width, header.Height, pitch, true);
		break;
	case 24:
		image = new CImage(ECF_R8G8B8, dim);
		if (image)
			CColorConverter::convert24BitTo24Bit(bmpData, (u8*)image->lock(), header.Width, header.Height, pitch, true, true);
		break;
	case 32: // thx to Reinhard Ostermeier
		image = new CImage(ECF_A8R8G8B8, dim);
		if (image)
			CColorConverter::convert32BitTo32Bit((s32*)bmpData, (s32*)image->lock(), header.Width, header.Height, pitch, true);
		break;
	};
	if (image)
		image->unlock();

	// clean up

	delete [] paletteData;
	delete [] bmpData;

	return image;
}


//! creates a loader which is able to load windows bitmaps
IImageLoader* createImageLoaderBMP()
{
	return new CImageLoaderBMP;
}


} // end namespace video
} // end namespace irr

#endif