Line data Source code
1 : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
2 : /*
3 : * This file is part of the LibreOffice project.
4 : *
5 : * This Source Code Form is subject to the terms of the Mozilla Public
6 : * License, v. 2.0. If a copy of the MPL was not distributed with this
7 : * file, You can obtain one at http://mozilla.org/MPL/2.0/.
8 : *
9 : * This file incorporates work covered by the following license notice:
10 : *
11 : * Licensed to the Apache Software Foundation (ASF) under one or more
12 : * contributor license agreements. See the NOTICE file distributed
13 : * with this work for additional information regarding copyright
14 : * ownership. The ASF licenses this file to you under the Apache
15 : * License, Version 2.0 (the "License"); you may not use this file
16 : * except in compliance with the License. You may obtain a copy of
17 : * the License at http://www.apache.org/licenses/LICENSE-2.0 .
18 : */
19 :
20 : #include <vcl/bmpacc.hxx>
21 : #include <vcl/salbtype.hxx>
22 : #include <bmpfast.hxx>
23 : #include <boost/scoped_array.hpp>
24 :
25 : #define IMPL_CASE_GET_FORMAT( Format ) \
26 : case( BMP_FORMAT##Format ): \
27 : pFncGetPixel = BitmapReadAccess::GetPixelFor##Format; \
28 : break
29 :
30 : #define IMPL_CASE_SET_FORMAT( Format, BitCount ) \
31 : case( BMP_FORMAT##Format ): \
32 : { \
33 : pFncSetPixel = BitmapReadAccess::SetPixelFor##Format; \
34 : pDstBuffer->mnBitCount = BitCount; \
35 : } \
36 : break
37 :
38 : #define DOUBLE_SCANLINES() \
39 : while( ( nActY < nHeight1 ) && ( pMapY[ nActY + 1 ] == nMapY ) ) \
40 : { \
41 : memcpy( pDstScanMap[ nActY + 1L ], pDstScan, rDstBuffer.mnScanlineSize ); \
42 : nActY++; \
43 : }
44 :
45 : #define TC_TO_PAL_COLORS 4096
46 :
47 0 : static long ImplIndexFromColor( const BitmapColor& rCol )
48 : {
49 : #if TC_TO_PAL_COLORS == 4096
50 :
51 0 : return( ( ( (long) rCol.GetBlue() >> 4L) << 8L ) |
52 0 : ( ( (long) rCol.GetGreen() >> 4L ) << 4L ) |
53 0 : ( (long) rCol.GetRed() >> 4L ) );
54 :
55 : #elif TC_TO_PAL_COLORS == 32768
56 :
57 : return( ( ( (long) rCol.GetBlue() >> 3L) << 10L ) |
58 : ( ( (long) rCol.GetGreen() >> 3L ) << 5L ) |
59 : ( (long) rCol.GetRed() >> 3L ) );
60 :
61 : #endif
62 : }
63 :
64 0 : static void ImplPALToPAL( const BitmapBuffer& rSrcBuffer, BitmapBuffer& rDstBuffer,
65 : FncGetPixel pFncGetPixel, FncSetPixel pFncSetPixel,
66 : Scanline* pSrcScanMap, Scanline* pDstScanMap, long* pMapX, long* pMapY )
67 : {
68 0 : const long nWidth = rDstBuffer.mnWidth, nHeight = rDstBuffer.mnHeight, nHeight1 = nHeight - 1;
69 0 : const ColorMask& rSrcMask = rSrcBuffer.maColorMask;
70 0 : const ColorMask& rDstMask = rDstBuffer.maColorMask;
71 0 : BitmapPalette aColMap( rSrcBuffer.maPalette.GetEntryCount() );
72 0 : BitmapColor* pColMapBuf = aColMap.ImplGetColorBuffer();
73 0 : BitmapColor aIndex( 0 );
74 :
75 0 : for( sal_uInt16 i = 0, nSrcCount = aColMap.GetEntryCount(), nDstCount = rDstBuffer.maPalette.GetEntryCount(); i < nSrcCount; i++ )
76 : {
77 0 : if( ( i < nDstCount ) && ( rSrcBuffer.maPalette[ i ] == rDstBuffer.maPalette[ i ] ) )
78 0 : aIndex.SetIndex( sal::static_int_cast<sal_uInt8>(i) );
79 : else
80 0 : aIndex.SetIndex( sal::static_int_cast<sal_uInt8>(rDstBuffer.maPalette.GetBestIndex( rSrcBuffer.maPalette[ i ] )) );
81 :
82 0 : pColMapBuf[ i ] = aIndex;
83 : }
84 :
85 0 : for( long nActY = 0, nMapY; nActY < nHeight; nActY++ )
86 : {
87 0 : Scanline pSrcScan( pSrcScanMap[ nMapY = pMapY[ nActY ] ] ), pDstScan( pDstScanMap[ nActY ] );
88 :
89 0 : for( long nX = 0L; nX < nWidth; nX++ )
90 0 : pFncSetPixel( pDstScan, nX, pColMapBuf[ pFncGetPixel( pSrcScan, pMapX[ nX ], rSrcMask ).GetIndex() ], rDstMask );
91 :
92 0 : DOUBLE_SCANLINES();
93 0 : }
94 0 : }
95 :
96 0 : static void ImplPALToTC( const BitmapBuffer& rSrcBuffer, BitmapBuffer& rDstBuffer,
97 : FncGetPixel pFncGetPixel, FncSetPixel pFncSetPixel,
98 : Scanline* pSrcScanMap, Scanline* pDstScanMap, long* pMapX, long* pMapY )
99 : {
100 0 : const long nWidth = rDstBuffer.mnWidth, nHeight = rDstBuffer.mnHeight, nHeight1 = nHeight - 1;
101 0 : const ColorMask& rSrcMask = rSrcBuffer.maColorMask;
102 0 : const ColorMask& rDstMask = rDstBuffer.maColorMask;
103 0 : const BitmapColor* pColBuf = rSrcBuffer.maPalette.ImplGetColorBuffer();
104 :
105 0 : if( BMP_SCANLINE_FORMAT( rSrcBuffer.mnFormat ) == BMP_FORMAT_1BIT_MSB_PAL )
106 : {
107 0 : const BitmapColor aCol0( pColBuf[ 0 ] );
108 0 : const BitmapColor aCol1( pColBuf[ 1 ] );
109 : long nMapX;
110 :
111 0 : for( long nActY = 0, nMapY; nActY < nHeight; nActY++ )
112 : {
113 0 : Scanline pSrcScan( pSrcScanMap[ nMapY = pMapY[ nActY ] ] ), pDstScan( pDstScanMap[ nActY ] );
114 :
115 0 : for( long nX = 0L; nX < nWidth; )
116 : {
117 0 : nMapX = pMapX[ nX ];
118 : pFncSetPixel( pDstScan, nX++,
119 0 : pSrcScan[ nMapX >> 3 ] & ( 1 << ( 7 - ( nMapX & 7 ) ) ) ? aCol1 : aCol0,
120 0 : rDstMask );
121 : }
122 :
123 0 : DOUBLE_SCANLINES();
124 0 : }
125 : }
126 0 : else if( BMP_SCANLINE_FORMAT( rSrcBuffer.mnFormat ) == BMP_FORMAT_4BIT_MSN_PAL )
127 : {
128 : long nMapX;
129 :
130 0 : for( long nActY = 0, nMapY; nActY < nHeight; nActY++ )
131 : {
132 0 : Scanline pSrcScan( pSrcScanMap[ nMapY = pMapY[ nActY ] ] ), pDstScan( pDstScanMap[ nActY ] );
133 :
134 0 : for( long nX = 0L; nX < nWidth; )
135 : {
136 0 : nMapX = pMapX[ nX ];
137 : pFncSetPixel( pDstScan, nX++,
138 0 : pColBuf[ ( pSrcScan[ nMapX >> 1 ] >> ( nMapX & 1 ? 0 : 4 ) ) & 0x0f ],
139 0 : rDstMask );
140 : }
141 :
142 0 : DOUBLE_SCANLINES();
143 : }
144 : }
145 0 : else if( BMP_SCANLINE_FORMAT( rSrcBuffer.mnFormat ) == BMP_FORMAT_8BIT_PAL )
146 : {
147 0 : for( long nActY = 0, nMapY; nActY < nHeight; nActY++ )
148 : {
149 0 : Scanline pSrcScan( pSrcScanMap[ nMapY = pMapY[ nActY ] ] ), pDstScan( pDstScanMap[ nActY ] );
150 :
151 0 : for( long nX = 0L; nX < nWidth; nX++ )
152 0 : pFncSetPixel( pDstScan, nX, pColBuf[ pSrcScan[ pMapX[ nX ] ] ], rDstMask );
153 :
154 0 : DOUBLE_SCANLINES();
155 : }
156 : }
157 : else
158 : {
159 0 : for( long nActY = 0, nMapY; nActY < nHeight; nActY++ )
160 : {
161 0 : Scanline pSrcScan( pSrcScanMap[ nMapY = pMapY[ nActY ] ] ), pDstScan( pDstScanMap[ nActY ] );
162 :
163 0 : for( long nX = 0L; nX < nWidth; nX++ )
164 0 : pFncSetPixel( pDstScan, nX, pColBuf[ pFncGetPixel( pSrcScan, pMapX[ nX ], rSrcMask ).GetIndex() ], rDstMask );
165 :
166 0 : DOUBLE_SCANLINES();
167 : }
168 : }
169 0 : }
170 :
171 0 : static void ImplTCToTC( const BitmapBuffer& rSrcBuffer, BitmapBuffer& rDstBuffer,
172 : FncGetPixel pFncGetPixel, FncSetPixel pFncSetPixel,
173 : Scanline* pSrcScanMap, Scanline* pDstScanMap, long* pMapX, long* pMapY )
174 : {
175 0 : const long nWidth = rDstBuffer.mnWidth, nHeight = rDstBuffer.mnHeight, nHeight1 = nHeight - 1;
176 0 : const ColorMask& rSrcMask = rSrcBuffer.maColorMask;
177 0 : const ColorMask& rDstMask = rDstBuffer.maColorMask;
178 :
179 0 : if( BMP_SCANLINE_FORMAT( rSrcBuffer.mnFormat ) == BMP_FORMAT_24BIT_TC_BGR )
180 : {
181 0 : BitmapColor aCol;
182 0 : sal_uInt8* pPixel = NULL;
183 :
184 0 : for( long nActY = 0, nMapY; nActY < nHeight; nActY++ )
185 : {
186 0 : Scanline pSrcScan( pSrcScanMap[ nMapY = pMapY[ nActY ] ] ), pDstScan( pDstScanMap[ nActY ] );
187 :
188 0 : for( long nX = 0L; nX < nWidth; nX++ )
189 : {
190 0 : aCol.SetBlue( *( pPixel = ( pSrcScan + pMapX[ nX ] * 3 ) )++ );
191 0 : aCol.SetGreen( *pPixel++ );
192 0 : aCol.SetRed( *pPixel );
193 0 : pFncSetPixel( pDstScan, nX, aCol, rDstMask );
194 : }
195 :
196 0 : DOUBLE_SCANLINES()
197 0 : }
198 : }
199 : else
200 : {
201 0 : for( long nActY = 0, nMapY; nActY < nHeight; nActY++ )
202 : {
203 0 : Scanline pSrcScan( pSrcScanMap[ nMapY = pMapY[ nActY ] ] ), pDstScan( pDstScanMap[ nActY ] );
204 :
205 0 : for( long nX = 0L; nX < nWidth; nX++ )
206 0 : pFncSetPixel( pDstScan, nX, pFncGetPixel( pSrcScan, pMapX[ nX ], rSrcMask ), rDstMask );
207 :
208 0 : DOUBLE_SCANLINES();
209 : }
210 : }
211 0 : }
212 :
213 0 : static void ImplTCToPAL( const BitmapBuffer& rSrcBuffer, BitmapBuffer& rDstBuffer,
214 : FncGetPixel pFncGetPixel, FncSetPixel pFncSetPixel,
215 : Scanline* pSrcScanMap, Scanline* pDstScanMap, long* pMapX, long* pMapY )
216 : {
217 0 : const long nWidth = rDstBuffer.mnWidth, nHeight = rDstBuffer.mnHeight, nHeight1 = nHeight - 1;
218 0 : const ColorMask& rSrcMask = rSrcBuffer.maColorMask;
219 0 : const ColorMask& rDstMask = rDstBuffer.maColorMask;
220 0 : BitmapPalette aColMap( rSrcBuffer.maPalette.GetEntryCount() );
221 0 : boost::scoped_array<sal_uInt8> pColToPalMap(new sal_uInt8[ TC_TO_PAL_COLORS ]);
222 0 : BitmapColor aIndex( 0 );
223 :
224 0 : for( long nR = 0; nR < 16; nR++ )
225 : {
226 0 : for( long nG = 0; nG < 16; nG++ )
227 : {
228 0 : for( long nB = 0; nB < 16; nB++ )
229 : {
230 0 : BitmapColor aCol( sal::static_int_cast<sal_uInt8>(nR << 4),
231 0 : sal::static_int_cast<sal_uInt8>(nG << 4),
232 0 : sal::static_int_cast<sal_uInt8>(nB << 4) );
233 0 : pColToPalMap[ ImplIndexFromColor( aCol ) ] = (sal_uInt8) rDstBuffer.maPalette.GetBestIndex( aCol );
234 0 : }
235 : }
236 : }
237 :
238 0 : for( long nActY = 0, nMapY; nActY < nHeight; nActY++ )
239 : {
240 0 : Scanline pSrcScan( pSrcScanMap[ nMapY = pMapY[ nActY ] ] ), pDstScan( pDstScanMap[ nActY ] );
241 :
242 0 : for( long nX = 0L; nX < nWidth; nX++ )
243 : {
244 0 : aIndex.SetIndex( pColToPalMap[ ImplIndexFromColor( pFncGetPixel( pSrcScan, pMapX[ nX ], rSrcMask ) ) ] );
245 0 : pFncSetPixel( pDstScan, nX, aIndex, rDstMask );
246 : }
247 :
248 0 : DOUBLE_SCANLINES();
249 0 : }
250 0 : }
251 :
252 0 : BitmapBuffer* StretchAndConvert(
253 : const BitmapBuffer& rSrcBuffer, const SalTwoRect& rTwoRect,
254 : sal_uLong nDstBitmapFormat, const BitmapPalette* pDstPal, const ColorMask* pDstMask )
255 : {
256 : FncGetPixel pFncGetPixel;
257 : FncSetPixel pFncSetPixel;
258 0 : BitmapBuffer* pDstBuffer = new BitmapBuffer;
259 : long i;
260 :
261 : // set function for getting pixels
262 0 : switch( BMP_SCANLINE_FORMAT( rSrcBuffer.mnFormat ) )
263 : {
264 0 : IMPL_CASE_GET_FORMAT( _1BIT_MSB_PAL );
265 0 : IMPL_CASE_GET_FORMAT( _1BIT_LSB_PAL );
266 0 : IMPL_CASE_GET_FORMAT( _4BIT_MSN_PAL );
267 0 : IMPL_CASE_GET_FORMAT( _4BIT_LSN_PAL );
268 0 : IMPL_CASE_GET_FORMAT( _8BIT_PAL );
269 0 : IMPL_CASE_GET_FORMAT( _8BIT_TC_MASK );
270 0 : IMPL_CASE_GET_FORMAT( _16BIT_TC_MSB_MASK );
271 0 : IMPL_CASE_GET_FORMAT( _16BIT_TC_LSB_MASK );
272 0 : IMPL_CASE_GET_FORMAT( _24BIT_TC_BGR );
273 0 : IMPL_CASE_GET_FORMAT( _24BIT_TC_RGB );
274 0 : IMPL_CASE_GET_FORMAT( _24BIT_TC_MASK );
275 0 : IMPL_CASE_GET_FORMAT( _32BIT_TC_ABGR );
276 0 : IMPL_CASE_GET_FORMAT( _32BIT_TC_ARGB );
277 0 : IMPL_CASE_GET_FORMAT( _32BIT_TC_BGRA );
278 0 : IMPL_CASE_GET_FORMAT( _32BIT_TC_RGBA );
279 0 : IMPL_CASE_GET_FORMAT( _32BIT_TC_MASK );
280 :
281 : default:
282 : // should never come here
283 : // initialize pFncGetPixel to something valid that is
284 : // least likely to crash
285 0 : pFncGetPixel = BitmapReadAccess::GetPixelFor_1BIT_MSB_PAL;
286 : OSL_FAIL( "unknown read format" );
287 0 : break;
288 : }
289 :
290 : // set function for setting pixels
291 0 : const sal_uLong nDstScanlineFormat = BMP_SCANLINE_FORMAT( nDstBitmapFormat );
292 0 : switch( nDstScanlineFormat )
293 : {
294 0 : IMPL_CASE_SET_FORMAT( _1BIT_MSB_PAL, 1 );
295 0 : IMPL_CASE_SET_FORMAT( _1BIT_LSB_PAL, 1 );
296 0 : IMPL_CASE_SET_FORMAT( _4BIT_MSN_PAL, 1 );
297 0 : IMPL_CASE_SET_FORMAT( _4BIT_LSN_PAL, 4 );
298 0 : IMPL_CASE_SET_FORMAT( _8BIT_PAL, 8 );
299 0 : IMPL_CASE_SET_FORMAT( _8BIT_TC_MASK, 8 );
300 0 : IMPL_CASE_SET_FORMAT( _16BIT_TC_MSB_MASK, 16 );
301 0 : IMPL_CASE_SET_FORMAT( _16BIT_TC_LSB_MASK, 16 );
302 0 : IMPL_CASE_SET_FORMAT( _24BIT_TC_BGR, 24 );
303 0 : IMPL_CASE_SET_FORMAT( _24BIT_TC_RGB, 24 );
304 0 : IMPL_CASE_SET_FORMAT( _24BIT_TC_MASK, 24 );
305 0 : IMPL_CASE_SET_FORMAT( _32BIT_TC_ABGR, 32 );
306 0 : IMPL_CASE_SET_FORMAT( _32BIT_TC_ARGB, 32 );
307 0 : IMPL_CASE_SET_FORMAT( _32BIT_TC_BGRA, 32 );
308 0 : IMPL_CASE_SET_FORMAT( _32BIT_TC_RGBA, 32 );
309 0 : IMPL_CASE_SET_FORMAT( _32BIT_TC_MASK, 32 );
310 :
311 : default:
312 : // should never come here
313 : // initialize pFncSetPixel to something valid that is
314 : // least likely to crash
315 0 : pFncSetPixel = BitmapReadAccess::SetPixelFor_1BIT_MSB_PAL;
316 0 : pDstBuffer->mnBitCount = 1;
317 : OSL_FAIL( "unknown write format" );
318 0 : break;
319 : }
320 :
321 : // fill destination buffer
322 0 : pDstBuffer->mnFormat = nDstBitmapFormat;
323 0 : pDstBuffer->mnWidth = rTwoRect.mnDestWidth;
324 0 : pDstBuffer->mnHeight = rTwoRect.mnDestHeight;
325 0 : pDstBuffer->mnScanlineSize = AlignedWidth4Bytes( pDstBuffer->mnBitCount * pDstBuffer->mnWidth );
326 : try
327 : {
328 0 : pDstBuffer->mpBits = new sal_uInt8[ pDstBuffer->mnScanlineSize * pDstBuffer->mnHeight ];
329 : }
330 0 : catch( const std::bad_alloc& )
331 : {
332 : // memory exception, clean up
333 0 : pDstBuffer->mpBits = NULL;
334 0 : delete pDstBuffer;
335 0 : return NULL;
336 : }
337 :
338 : // do we need a destination palette or color mask?
339 0 : if( ( nDstScanlineFormat == BMP_FORMAT_1BIT_MSB_PAL ) ||
340 0 : ( nDstScanlineFormat == BMP_FORMAT_1BIT_LSB_PAL ) ||
341 0 : ( nDstScanlineFormat == BMP_FORMAT_4BIT_MSN_PAL ) ||
342 0 : ( nDstScanlineFormat == BMP_FORMAT_4BIT_LSN_PAL ) ||
343 : ( nDstScanlineFormat == BMP_FORMAT_8BIT_PAL ) )
344 : {
345 : DBG_ASSERT( pDstPal, "destination buffer requires palette" );
346 0 : pDstBuffer->maPalette = *pDstPal;
347 : }
348 0 : else if( ( nDstScanlineFormat == BMP_FORMAT_8BIT_TC_MASK ) ||
349 0 : ( nDstScanlineFormat == BMP_FORMAT_16BIT_TC_MSB_MASK ) ||
350 0 : ( nDstScanlineFormat == BMP_FORMAT_16BIT_TC_LSB_MASK ) ||
351 0 : ( nDstScanlineFormat == BMP_FORMAT_24BIT_TC_MASK ) ||
352 : ( nDstScanlineFormat == BMP_FORMAT_32BIT_TC_MASK ) )
353 : {
354 : DBG_ASSERT( pDstMask, "destination buffer requires color mask" );
355 0 : pDstBuffer->maColorMask = *pDstMask;
356 : }
357 :
358 : // short circuit the most important conversions
359 0 : bool bFastConvert = ImplFastBitmapConversion( *pDstBuffer, rSrcBuffer, rTwoRect );
360 0 : if( bFastConvert )
361 0 : return pDstBuffer;
362 :
363 0 : const long nSrcX = rTwoRect.mnSrcX, nSrcY = rTwoRect.mnSrcY;
364 0 : const long nSrcDX = rTwoRect.mnSrcWidth, nSrcDY = rTwoRect.mnSrcHeight;
365 0 : const long nDstDX = rTwoRect.mnDestWidth, nDstDY = rTwoRect.mnDestHeight;
366 0 : Scanline* pSrcScan = NULL;
367 0 : Scanline* pDstScan = NULL;
368 0 : long* pMapX = NULL;
369 0 : long* pMapY = NULL;
370 : long nTmp, nOffset;
371 :
372 : try
373 : {
374 0 : pSrcScan = new Scanline[ rSrcBuffer.mnHeight ];
375 0 : pDstScan = new Scanline[ nDstDY ];
376 0 : pMapX = new long[ nDstDX ];
377 0 : pMapY = new long[ nDstDY ];
378 : }
379 0 : catch( const std::bad_alloc& )
380 : {
381 : // memory exception, clean up
382 : // remark: the buffer ptr causing the exception
383 : // is still NULL here
384 0 : delete[] pSrcScan;
385 0 : delete[] pDstScan;
386 0 : delete[] pMapX;
387 0 : delete[] pMapY;
388 0 : delete pDstBuffer;
389 0 : return NULL;
390 : }
391 :
392 : // horizontal mapping table
393 0 : if( (nDstDX != nSrcDX) && (nDstDX != 0) )
394 : {
395 0 : const double fFactorX = (double)nSrcDX / nDstDX;
396 :
397 0 : for( i = 0L; i < nDstDX; i++ )
398 0 : pMapX[ i ] = nSrcX + static_cast<int>( i * fFactorX );
399 : }
400 : else
401 : {
402 0 : for( i = 0L, nTmp = nSrcX; i < nDstDX; i++ )
403 0 : pMapX[ i ] = nTmp++;
404 : }
405 :
406 : // vertical mapping table
407 0 : if( (nDstDY != nSrcDY) && (nDstDY != 0) )
408 : {
409 0 : const double fFactorY = (double)nSrcDY / nDstDY;
410 :
411 0 : for( i = 0L; i < nDstDY; i++ )
412 0 : pMapY[ i ] = nSrcY + static_cast<int>( i * fFactorY );
413 : }
414 : else
415 : {
416 0 : for( i = 0L, nTmp = nSrcY; i < nDstDY; i++ )
417 0 : pMapY[ i ] = nTmp++;
418 : }
419 :
420 : // source scanline buffer
421 : Scanline pTmpScan;
422 0 : if( BMP_SCANLINE_ADJUSTMENT( rSrcBuffer.mnFormat ) == BMP_FORMAT_TOP_DOWN )
423 0 : pTmpScan = rSrcBuffer.mpBits, nOffset = rSrcBuffer.mnScanlineSize;
424 : else
425 : {
426 0 : pTmpScan = rSrcBuffer.mpBits + ( rSrcBuffer.mnHeight - 1 ) * rSrcBuffer.mnScanlineSize;
427 0 : nOffset = -rSrcBuffer.mnScanlineSize;
428 : }
429 :
430 0 : for( i = 0L; i < rSrcBuffer.mnHeight; i++, pTmpScan += nOffset )
431 0 : pSrcScan[ i ] = pTmpScan;
432 :
433 : // destination scanline buffer
434 0 : if( BMP_SCANLINE_ADJUSTMENT( pDstBuffer->mnFormat ) == BMP_FORMAT_TOP_DOWN )
435 0 : pTmpScan = pDstBuffer->mpBits, nOffset = pDstBuffer->mnScanlineSize;
436 : else
437 : {
438 0 : pTmpScan = pDstBuffer->mpBits + ( nDstDY - 1 ) * pDstBuffer->mnScanlineSize;
439 0 : nOffset = -pDstBuffer->mnScanlineSize;
440 : }
441 :
442 0 : for( i = 0L; i < nDstDY; i++, pTmpScan += nOffset )
443 0 : pDstScan[ i ] = pTmpScan;
444 :
445 : // do buffer scaling and conversion
446 0 : if( rSrcBuffer.mnBitCount <= 8 && pDstBuffer->mnBitCount <= 8 )
447 : {
448 : ImplPALToPAL( rSrcBuffer, *pDstBuffer, pFncGetPixel, pFncSetPixel,
449 0 : pSrcScan, pDstScan, pMapX, pMapY );
450 : }
451 0 : else if( rSrcBuffer.mnBitCount <= 8 && pDstBuffer->mnBitCount > 8 )
452 : {
453 : ImplPALToTC( rSrcBuffer, *pDstBuffer, pFncGetPixel, pFncSetPixel,
454 0 : pSrcScan, pDstScan, pMapX, pMapY );
455 : }
456 0 : else if( rSrcBuffer.mnBitCount > 8 && pDstBuffer->mnBitCount > 8 )
457 : {
458 : ImplTCToTC( rSrcBuffer, *pDstBuffer, pFncGetPixel, pFncSetPixel,
459 0 : pSrcScan, pDstScan, pMapX, pMapY );
460 : }
461 : else
462 : {
463 : ImplTCToPAL( rSrcBuffer, *pDstBuffer, pFncGetPixel, pFncSetPixel,
464 0 : pSrcScan, pDstScan, pMapX, pMapY );
465 : }
466 :
467 : // cleanup
468 0 : delete[] pSrcScan;
469 0 : delete[] pDstScan;
470 0 : delete[] pMapX;
471 0 : delete[] pMapY;
472 :
473 0 : return pDstBuffer;
474 : }
475 :
476 : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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