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source: downloads/OgreMain/src/OgreImage.cpp @ 1

Last change on this file since 1 was 1, checked in by landauf, 17 years ago

File size: 21.4 KB

Line
1	/*
2	-----------------------------------------------------------------------------
3	This source file is part of OGRE
4	(Object-oriented Graphics Rendering Engine)
5	For the latest info, see http://www.ogre3d.org/
6
7	Copyright (c) 2000-2006 Torus Knot Software Ltd
8	Also see acknowledgements in Readme.html
9
10	This program is free software; you can redistribute it and/or modify it under
11	the terms of the GNU Lesser General Public License as published by the Free Software
12	Foundation; either version 2 of the License, or (at your option) any later
13	version.
14
15	This program is distributed in the hope that it will be useful, but WITHOUT
16	ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
17	FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
18
19	You should have received a copy of the GNU Lesser General Public License along with
20	this program; if not, write to the Free Software Foundation, Inc., 59 Temple
21	Place - Suite 330, Boston, MA 02111-1307, USA, or go to
22	http://www.gnu.org/copyleft/lesser.txt.
23
24	You may alternatively use this source under the terms of a specific version of
25	the OGRE Unrestricted License provided you have obtained such a license from
26	Torus Knot Software Ltd.
27	-----------------------------------------------------------------------------
28	*/
29	#include "OgreStableHeaders.h"
30	#include "OgreImage.h"
31	#include "OgreArchiveManager.h"
32	#include "OgreException.h"
33	#include "OgreImageCodec.h"
34	#include "OgreColourValue.h"
35
36	#include "OgreImageResampler.h"
37
38	namespace Ogre {
39	ImageCodec::~ImageCodec() {
40	}
41
42	//-----------------------------------------------------------------------------
43	Image::Image()
44	: m_uWidth(0),
45	m_uHeight(0),
46	m_uDepth(0),
47	m_uSize(0),
48	m_uNumMipmaps(0),
49	m_uFlags(0),
50	m_pBuffer( NULL ),
51	m_bAutoDelete( true )
52	{
53	}
54
55	//-----------------------------------------------------------------------------
56	Image::Image( const Image &img )
57	: m_pBuffer( NULL ),
58	m_bAutoDelete( true )
59	{
60	// call assignment operator
61	*this = img;
62	}
63
64	//-----------------------------------------------------------------------------
65	Image::~Image()
66	{
67	//Only delete if this was not a dynamic image (meaning app holds & destroys buffer)
68	if( m_pBuffer && m_bAutoDelete )
69	{
70	delete[] m_pBuffer;
71	m_pBuffer = NULL;
72	}
73	}
74
75	//-----------------------------------------------------------------------------
76	Image & Image::operator = ( const Image &img )
77	{
78	if( m_pBuffer && m_bAutoDelete )
79	{
80	delete[] m_pBuffer;
81	m_pBuffer = NULL;
82	}
83	m_uWidth = img.m_uWidth;
84	m_uHeight = img.m_uHeight;
85	m_uDepth = img.m_uDepth;
86	m_eFormat = img.m_eFormat;
87	m_uSize = img.m_uSize;
88	m_uFlags = img.m_uFlags;
89	m_ucPixelSize = img.m_ucPixelSize;
90	m_uNumMipmaps = img.m_uNumMipmaps;
91	m_bAutoDelete = img.m_bAutoDelete;
92	//Only create/copy when previous data was not dynamic data
93	if( m_bAutoDelete )
94	{
95	m_pBuffer = new uchar[ m_uSize ];
96	memcpy( m_pBuffer, img.m_pBuffer, m_uSize );
97	}
98	else
99	{
100	m_pBuffer = img.m_pBuffer;
101	}
102
103	return *this;
104	}
105
106	//-----------------------------------------------------------------------------
107	Image & Image::flipAroundY()
108	{
109	if( !m_pBuffer )
110	{
111	OGRE_EXCEPT(
112	Exception::ERR_INTERNAL_ERROR,
113	"Can not flip an unitialized texture",
114	"Image::flipAroundY" );
115	}
116
117	m_uNumMipmaps = 0; // Image operations lose precomputed mipmaps
118
119	uchar *pTempBuffer1 = NULL;
120	ushort *pTempBuffer2 = NULL;
121	uchar *pTempBuffer3 = NULL;
122	uint *pTempBuffer4 = NULL;
123
124	uchar src1 = m_pBuffer, dst1 = NULL;
125	ushort src2 = (ushort )m_pBuffer, *dst2 = NULL;
126	uchar src3 = m_pBuffer, dst3 = NULL;
127	uint src4 = (uint )m_pBuffer, *dst4 = NULL;
128
129	ushort y;
130	switch (m_ucPixelSize)
131	{
132	case 1:
133	pTempBuffer1 = new uchar[m_uWidth * m_uHeight];
134	for (y = 0; y < m_uHeight; y++)
135	{
136	dst1 = (pTempBuffer1 + ((y * m_uWidth) + m_uWidth - 1));
137	for (ushort x = 0; x < m_uWidth; x++)
138	memcpy(dst1--, src1++, sizeof(uchar));
139	}
140
141	memcpy(m_pBuffer, pTempBuffer1, m_uWidth * m_uHeight * sizeof(uchar));
142	delete [] pTempBuffer1;
143	break;
144
145	case 2:
146	pTempBuffer2 = new ushort[m_uWidth * m_uHeight];
147	for (y = 0; y < m_uHeight; y++)
148	{
149	dst2 = (pTempBuffer2 + ((y * m_uWidth) + m_uWidth - 1));
150	for (ushort x = 0; x < m_uWidth; x++)
151	memcpy(dst2--, src2++, sizeof(ushort));
152	}
153
154	memcpy(m_pBuffer, pTempBuffer2, m_uWidth * m_uHeight * sizeof(ushort));
155	delete [] pTempBuffer2;
156	break;
157
158	case 3:
159	pTempBuffer3 = new uchar[m_uWidth * m_uHeight * 3];
160	for (y = 0; y < m_uHeight; y++)
161	{
162	size_t offset = ((y * m_uWidth) + (m_uWidth - 1)) * 3;
163	dst3 = pTempBuffer3;
164	dst3 += offset;
165	for (size_t x = 0; x < m_uWidth; x++)
166	{
167	memcpy(dst3, src3, sizeof(uchar) * 3);
168	dst3 -= 3; src3 += 3;
169	}
170	}
171
172	memcpy(m_pBuffer, pTempBuffer3, m_uWidth * m_uHeight * sizeof(uchar) * 3);
173	delete [] pTempBuffer3;
174	break;
175
176	case 4:
177	pTempBuffer4 = new uint[m_uWidth * m_uHeight];
178	for (y = 0; y < m_uHeight; y++)
179	{
180	dst4 = (pTempBuffer4 + ((y * m_uWidth) + m_uWidth - 1));
181	for (ushort x = 0; x < m_uWidth; x++)
182	memcpy(dst4--, src4++, sizeof(uint));
183	}
184
185	memcpy(m_pBuffer, pTempBuffer4, m_uWidth * m_uHeight * sizeof(uint));
186	delete [] pTempBuffer4;
187	break;
188
189	default:
190	OGRE_EXCEPT(
191	Exception::ERR_INTERNAL_ERROR,
192	"Unknown pixel depth",
193	"Image::flipAroundY" );
194	break;
195	}
196
197	return *this;
198
199	}
200
201	//-----------------------------------------------------------------------------
202	Image & Image::flipAroundX()
203	{
204	if( !m_pBuffer )
205	{
206	OGRE_EXCEPT(
207	Exception::ERR_INTERNAL_ERROR,
208	"Can not flip an unitialized texture",
209	"Image::flipAroundX" );
210	}
211
212	m_uNumMipmaps = 0; // Image operations lose precomputed mipmaps
213
214	size_t rowSpan = m_uWidth * m_ucPixelSize;
215
216	uchar pTempBuffer = new uchar[ rowSpan m_uHeight ];
217	uchar ptr1 = m_pBuffer, ptr2 = pTempBuffer + ( ( m_uHeight - 1 ) * rowSpan );
218
219	for( ushort i = 0; i < m_uHeight; i++ )
220	{
221	memcpy( ptr2, ptr1, rowSpan );
222	ptr1 += rowSpan; ptr2 -= rowSpan;
223	}
224
225	memcpy( m_pBuffer, pTempBuffer, rowSpan * m_uHeight);
226
227	delete [] pTempBuffer;
228
229	return *this;
230	}
231
232	//-----------------------------------------------------------------------------
233	Image& Image::loadDynamicImage( uchar* pData, size_t uWidth, size_t uHeight,
234	size_t depth,
235	PixelFormat eFormat, bool autoDelete,
236	size_t numFaces, size_t numMipMaps)
237	{
238
239	if( m_pBuffer && m_bAutoDelete )
240	{
241	delete[] m_pBuffer;
242	m_pBuffer = NULL;
243	}
244	// Set image metadata
245	m_uWidth = uWidth;
246	m_uHeight = uHeight;
247	m_uDepth = depth;
248	m_eFormat = eFormat;
249	m_ucPixelSize = static_cast<uchar>(PixelUtil::getNumElemBytes( m_eFormat ));
250	m_uNumMipmaps = numMipMaps;
251	m_uFlags = 0;
252	// Set flags
253	if (PixelUtil::isCompressed(eFormat))
254	m_uFlags \|= IF_COMPRESSED;
255	if (m_uDepth != 1)
256	m_uFlags \|= IF_3D_TEXTURE;
257	if(numFaces == 6)
258	m_uFlags \|= IF_CUBEMAP;
259	if(numFaces != 6 && numFaces != 1)
260	OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS,
261	"Number of faces currently must be 6 or 1.",
262	"Image::loadDynamicImage");
263
264	m_uSize = calculateSize(numMipMaps, numFaces, uWidth, uHeight, depth, eFormat);
265	m_pBuffer = pData;
266	m_bAutoDelete = autoDelete;
267
268	return *this;
269
270	}
271
272	//-----------------------------------------------------------------------------
273	Image & Image::loadRawData(
274	DataStreamPtr& stream,
275	size_t uWidth, size_t uHeight, size_t uDepth,
276	PixelFormat eFormat,
277	size_t numFaces, size_t numMipMaps)
278	{
279
280	size_t size = calculateSize(numMipMaps, numFaces, uWidth, uHeight, uDepth, eFormat);
281	if (size != stream->size())
282	{
283	OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS,
284	"Stream size does not match calculated image size",
285	"Image::loadRawData");
286	}
287
288	uchar *buffer = new uchar[ size ];
289	stream->read(buffer, size);
290
291	return loadDynamicImage(buffer,
292	uWidth, uHeight, uDepth,
293	eFormat, true, numFaces, numMipMaps);
294
295	}
296
297	//-----------------------------------------------------------------------------
298	Image & Image::load(const String& strFileName, const String& group)
299	{
300
301	if( m_pBuffer && m_bAutoDelete )
302	{
303	delete[] m_pBuffer;
304	m_pBuffer = NULL;
305	}
306
307	String strExt;
308
309	size_t pos = strFileName.find_last_of(".");
310	if( pos == String::npos )
311	OGRE_EXCEPT(
312	Exception::ERR_INVALIDPARAMS,
313	"Unable to load image file '" + strFileName + "' - invalid extension.",
314	"Image::load" );
315
316	while( pos != strFileName.length() - 1 )
317	strExt += strFileName[++pos];
318
319	Codec * pCodec = Codec::getCodec(strExt);
320	if( !pCodec )
321	OGRE_EXCEPT(
322	Exception::ERR_INVALIDPARAMS,
323	"Unable to load image file '" + strFileName + "' - invalid extension.",
324	"Image::load" );
325
326	DataStreamPtr encoded =
327	ResourceGroupManager::getSingleton().openResource(strFileName, group);
328
329	Codec::DecodeResult res = pCodec->decode(encoded);
330
331	ImageCodec::ImageData* pData =
332	static_cast<ImageCodec::ImageData*>(res.second.getPointer());
333
334	// Get the format and compute the pixel size
335	m_uWidth = pData->width;
336	m_uHeight = pData->height;
337	m_uDepth = pData->depth;
338	m_uSize = pData->size;
339	m_eFormat = pData->format;
340	m_uNumMipmaps = pData->num_mipmaps;
341	m_ucPixelSize = static_cast<uchar>(PixelUtil::getNumElemBytes( m_eFormat ));
342	m_uFlags = pData->flags;
343
344	// re-use the decoded buffer
345	m_pBuffer = res.first->getPtr();
346	// ensure we don't delete when stream is closed
347	res.first->setFreeOnClose(false);
348
349	return *this;
350
351	}
352	//-----------------------------------------------------------------------------
353	void Image::save(const String& filename)
354	{
355	if( !m_pBuffer )
356	{
357	OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS, "No image data loaded",
358	"Image::save");
359	}
360
361	String strExt;
362	size_t pos = filename.find_last_of(".");
363	if( pos == String::npos )
364	OGRE_EXCEPT(
365	Exception::ERR_INVALIDPARAMS,
366	"Unable to save image file '" + filename + "' - invalid extension.",
367	"Image::save" );
368
369	while( pos != filename.length() - 1 )
370	strExt += filename[++pos];
371
372	Codec * pCodec = Codec::getCodec(strExt);
373	if( !pCodec )
374	OGRE_EXCEPT(
375	Exception::ERR_INVALIDPARAMS,
376	"Unable to save image file '" + filename + "' - invalid extension.",
377	"Image::save" );
378
379	ImageCodec::ImageData* imgData = new ImageCodec::ImageData();
380	imgData->format = m_eFormat;
381	imgData->height = m_uHeight;
382	imgData->width = m_uWidth;
383	imgData->depth = m_uDepth;
384	// Wrap in CodecDataPtr, this will delete
385	Codec::CodecDataPtr codeDataPtr(imgData);
386	// Wrap memory, be sure not to delete when stream destroyed
387	MemoryDataStreamPtr wrapper(new MemoryDataStream(m_pBuffer, m_uSize, false));
388
389	pCodec->codeToFile(wrapper, filename, codeDataPtr);
390	}
391	//-----------------------------------------------------------------------------
392	Image & Image::load(DataStreamPtr& stream, const String& type )
393	{
394	if( m_pBuffer && m_bAutoDelete )
395	{
396	delete[] m_pBuffer;
397	m_pBuffer = NULL;
398	}
399
400	String strType = type;
401
402	Codec * pCodec = Codec::getCodec(strType);
403	if( !pCodec )
404	OGRE_EXCEPT(
405	Exception::ERR_INVALIDPARAMS,
406	"Unable to load image - invalid extension.",
407	"Image::load" );
408
409	Codec::DecodeResult res = pCodec->decode(stream);
410
411	ImageCodec::ImageData* pData =
412	static_cast<ImageCodec::ImageData*>(res.second.getPointer());
413
414	m_uWidth = pData->width;
415	m_uHeight = pData->height;
416	m_uDepth = pData->depth;
417	m_uSize = pData->size;
418	m_uNumMipmaps = pData->num_mipmaps;
419	m_uFlags = pData->flags;
420
421	// Get the format and compute the pixel size
422	m_eFormat = pData->format;
423	m_ucPixelSize = static_cast<uchar>(PixelUtil::getNumElemBytes( m_eFormat ));
424	// Just use internal buffer of returned memory stream
425	m_pBuffer = res.first->getPtr();
426	// Make sure stream does not delete
427	res.first->setFreeOnClose(false);
428
429	return *this;
430	}
431
432	//-----------------------------------------------------------------------------
433	uchar* Image::getData()
434	{
435	return m_pBuffer;
436	}
437
438	//-----------------------------------------------------------------------------
439	const uchar* Image::getData() const
440	{
441	assert( m_pBuffer );
442	return m_pBuffer;
443	}
444
445	//-----------------------------------------------------------------------------
446	size_t Image::getSize() const
447	{
448	return m_uSize;
449	}
450
451	//-----------------------------------------------------------------------------
452	size_t Image::getNumMipmaps() const
453	{
454	return m_uNumMipmaps;
455	}
456
457	//-----------------------------------------------------------------------------
458	bool Image::hasFlag(const ImageFlags imgFlag) const
459	{
460	if(m_uFlags & imgFlag)
461	{
462	return true;
463	}
464	else
465	{
466	return false;
467	}
468	}
469
470	//-----------------------------------------------------------------------------
471	size_t Image::getDepth() const
472	{
473	return m_uDepth;
474	}
475	//-----------------------------------------------------------------------------
476	size_t Image::getWidth() const
477	{
478	return m_uWidth;
479	}
480
481	//-----------------------------------------------------------------------------
482	size_t Image::getHeight() const
483	{
484	return m_uHeight;
485	}
486	//-----------------------------------------------------------------------------
487	size_t Image::getNumFaces(void) const
488	{
489	if(hasFlag(IF_CUBEMAP))
490	return 6;
491	return 1;
492	}
493	//-----------------------------------------------------------------------------
494	size_t Image::getRowSpan() const
495	{
496	return m_uWidth * m_ucPixelSize;
497	}
498
499	//-----------------------------------------------------------------------------
500	PixelFormat Image::getFormat() const
501	{
502	return m_eFormat;
503	}
504
505	//-----------------------------------------------------------------------------
506	uchar Image::getBPP() const
507	{
508	return m_ucPixelSize * 8;
509	}
510
511	//-----------------------------------------------------------------------------
512	bool Image::getHasAlpha(void) const
513	{
514	return PixelUtil::getFlags(m_eFormat) & PFF_HASALPHA;
515	}
516	//-----------------------------------------------------------------------------
517	void Image::applyGamma( unsigned char *buffer, Real gamma, size_t size, uchar bpp )
518	{
519	if( gamma == 1.0f )
520	return;
521
522	//NB only 24/32-bit supported
523	if( bpp != 24 && bpp != 32 ) return;
524
525	uint stride = bpp >> 3;
526
527	for( size_t i = 0, j = size / stride; i < j; i++, buffer += stride )
528	{
529	float r, g, b;
530
531	r = (float)buffer[0];
532	g = (float)buffer[1];
533	b = (float)buffer[2];
534
535	r = r * gamma;
536	g = g * gamma;
537	b = b * gamma;
538
539	float scale = 1.0f, tmp;
540
541	if( r > 255.0f && (tmp=(255.0f/r)) < scale )
542	scale = tmp;
543	if( g > 255.0f && (tmp=(255.0f/g)) < scale )
544	scale = tmp;
545	if( b > 255.0f && (tmp=(255.0f/b)) < scale )
546	scale = tmp;
547
548	r = scale; g = scale; b *= scale;
549
550	buffer[0] = (uchar)r;
551	buffer[1] = (uchar)g;
552	buffer[2] = (uchar)b;
553	}
554	}
555	//-----------------------------------------------------------------------------
556	void Image::resize(ushort width, ushort height, Filter filter)
557	{
558	// resizing dynamic images is not supported
559	assert(m_bAutoDelete);
560	assert(m_uDepth == 1);
561
562	// reassign buffer to temp image, make sure auto-delete is true
563	Image temp;
564	temp.loadDynamicImage(m_pBuffer, m_uWidth, m_uHeight, 1, m_eFormat, true);
565	// do not delete[] m_pBuffer! temp will destroy it
566
567	// set new dimensions, allocate new buffer
568	m_uWidth = width;
569	m_uHeight = height;
570	m_uSize = PixelUtil::getMemorySize(m_uWidth, m_uHeight, 1, m_eFormat);
571	m_pBuffer = new uchar[m_uSize];
572	m_uNumMipmaps = 0; // Loses precomputed mipmaps
573
574	// scale the image from temp into our resized buffer
575	Image::scale(temp.getPixelBox(), getPixelBox(), filter);
576	}
577	//-----------------------------------------------------------------------
578	void Image::scale(const PixelBox &src, const PixelBox &scaled, Filter filter)
579	{
580	assert(PixelUtil::isAccessible(src.format));
581	assert(PixelUtil::isAccessible(scaled.format));
582	MemoryDataStreamPtr buf; // For auto-delete
583	PixelBox temp;
584	switch (filter)
585	{
586	default:
587	case FILTER_NEAREST:
588	if(src.format == scaled.format)
589	{
590	// No intermediate buffer needed
591	temp = scaled;
592	}
593	else
594	{
595	// Allocate temporary buffer of destination size in source format
596	temp = PixelBox(scaled.getWidth(), scaled.getHeight(), scaled.getDepth(), src.format);
597	buf.bind(new MemoryDataStream(temp.getConsecutiveSize()));
598	temp.data = buf->getPtr();
599	}
600	// super-optimized: no conversion
601	switch (PixelUtil::getNumElemBytes(src.format))
602	{
603	case 1: NearestResampler<1>::scale(src, temp); break;
604	case 2: NearestResampler<2>::scale(src, temp); break;
605	case 3: NearestResampler<3>::scale(src, temp); break;
606	case 4: NearestResampler<4>::scale(src, temp); break;
607	case 6: NearestResampler<6>::scale(src, temp); break;
608	case 8: NearestResampler<8>::scale(src, temp); break;
609	case 12: NearestResampler<12>::scale(src, temp); break;
610	case 16: NearestResampler<16>::scale(src, temp); break;
611	default:
612	// never reached
613	assert(false);
614	}
615	if(temp.data != scaled.data)
616	{
617	// Blit temp buffer
618	PixelUtil::bulkPixelConversion(temp, scaled);
619	}
620	break;
621
622	case FILTER_LINEAR:
623	case FILTER_BILINEAR:
624	switch (src.format)
625	{
626	case PF_L8: case PF_A8: case PF_BYTE_LA:
627	case PF_R8G8B8: case PF_B8G8R8:
628	case PF_R8G8B8A8: case PF_B8G8R8A8:
629	case PF_A8B8G8R8: case PF_A8R8G8B8:
630	case PF_X8B8G8R8: case PF_X8R8G8B8:
631	if(src.format == scaled.format)
632	{
633	// No intermediate buffer needed
634	temp = scaled;
635	}
636	else
637	{
638	// Allocate temp buffer of destination size in source format
639	temp = PixelBox(scaled.getWidth(), scaled.getHeight(), scaled.getDepth(), src.format);
640	buf.bind(new MemoryDataStream(temp.getConsecutiveSize()));
641	temp.data = buf->getPtr();
642	}
643	// super-optimized: byte-oriented math, no conversion
644	switch (PixelUtil::getNumElemBytes(src.format))
645	{
646	case 1: LinearResampler_Byte<1>::scale(src, temp); break;
647	case 2: LinearResampler_Byte<2>::scale(src, temp); break;
648	case 3: LinearResampler_Byte<3>::scale(src, temp); break;
649	case 4: LinearResampler_Byte<4>::scale(src, temp); break;
650	default:
651	// never reached
652	assert(false);
653	}
654	if(temp.data != scaled.data)
655	{
656	// Blit temp buffer
657	PixelUtil::bulkPixelConversion(temp, scaled);
658	}
659	break;
660	case PF_FLOAT32_RGB:
661	case PF_FLOAT32_RGBA:
662	if (scaled.format == PF_FLOAT32_RGB \|\| scaled.format == PF_FLOAT32_RGBA)
663	{
664	// float32 to float32, avoid unpack/repack overhead
665	LinearResampler_Float32::scale(src, scaled);
666	break;
667	}
668	// else, fall through
669	default:
670	// non-optimized: floating-point math, performs conversion but always works
671	LinearResampler::scale(src, scaled);
672	}
673	break;
674	}
675	}
676
677	//-----------------------------------------------------------------------------
678
679	ColourValue Image::getColourAt(int x, int y, int z)
680	{
681	ColourValue rval;
682	PixelUtil::unpackColour(&rval, m_eFormat, &m_pBuffer[m_ucPixelSize * (z * m_uWidth * m_uHeight + m_uWidth * y + x)]);
683	return rval;
684	}
685
686	//-----------------------------------------------------------------------------
687
688	PixelBox Image::getPixelBox(size_t face, size_t mipmap) const
689	{
690	// Image data is arranged as:
691	// face 0, top level (mip 0)
692	// face 0, mip 1
693	// face 0, mip 2
694	// face 1, top level (mip 0)
695	// face 1, mip 1
696	// face 1, mip 2
697	// etc
698	if(mipmap > getNumMipmaps())
699	OGRE_EXCEPT( Exception::ERR_NOT_IMPLEMENTED,
700	"Mipmap index out of range",
701	"Image::getPixelBox" ) ;
702	if(face >= getNumFaces())
703	OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS, "Face index out of range",
704	"Image::getPixelBox");
705	// Calculate mipmap offset and size
706	uint8 offset = const_cast<uint8>(getData());
707	// Base offset is number of full faces
708	size_t width = getWidth(), height=getHeight(), depth=getDepth();
709	size_t numMips = getNumMipmaps();
710
711	// Figure out the offsets
712	size_t fullFaceSize = 0;
713	size_t finalFaceSize = 0;
714	size_t finalWidth, finalHeight, finalDepth;
715	for(size_t mip=0; mip <= numMips; ++mip)
716	{
717	if (mip == mipmap)
718	{
719	finalFaceSize = fullFaceSize;
720	finalWidth = width;
721	finalHeight = height;
722	finalDepth = depth;
723	}
724	fullFaceSize += PixelUtil::getMemorySize(width, height, depth, getFormat());
725
726	/// Half size in each dimension
727	if(width!=1) width /= 2;
728	if(height!=1) height /= 2;
729	if(depth!=1) depth /= 2;
730	}
731	// Advance pointer by number of full faces, plus mip offset into
732	offset += face * fullFaceSize;
733	offset += finalFaceSize;
734	// Return subface as pixelbox
735	PixelBox src(finalWidth, finalHeight, finalDepth, getFormat(), offset);
736	return src;
737	}
738	//-----------------------------------------------------------------------------
739	size_t Image::calculateSize(size_t mipmaps, size_t faces, size_t width, size_t height, size_t depth,
740	PixelFormat format)
741	{
742	size_t size = 0;
743	for(size_t mip=0; mip<=mipmaps; ++mip)
744	{
745	size += PixelUtil::getMemorySize(width, height, depth, format)*faces;
746	if(width!=1) width /= 2;
747	if(height!=1) height /= 2;
748	if(depth!=1) depth /= 2;
749	}
750	return size;
751	}
752
753	}

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