| 1235 | | CPLErr GTiffBitmapBand::IWriteBlock( int, int, void * ) |
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| 1236 | | |
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| 1237 | | { |
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| 1238 | | CPLError( CE_Failure, CPLE_AppDefined, |
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| 1239 | | "One bit raster bands are read-only." ); |
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| 1240 | | return CE_Failure; |
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| | 1235 | CPLErr GTiffBitmapBand::IWriteBlock( int nBlockXOff, int nBlockYOff, |
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| | 1236 | void * pImage ) |
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| | 1237 | |
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| | 1238 | { |
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| | 1239 | int nBlockId, nBlockBufSize; |
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| | 1240 | CPLErr eErr = CE_None; |
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| | 1241 | |
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| | 1242 | poGDS->Crystalize(); |
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| | 1243 | poGDS->SetDirectory(); |
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| | 1244 | |
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| | 1245 | CPLAssert( poGDS != NULL |
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| | 1246 | && nBlockXOff >= 0 |
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| | 1247 | && nBlockYOff >= 0 |
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| | 1248 | && pImage != NULL ); |
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| | 1249 | |
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| | 1250 | // First downsample to the particular number of bits in |
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| | 1251 | // a temporary buffer. |
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| | 1252 | int nLineOffset, iLine; |
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| | 1253 | GByte *pabyOddImg = (GByte *) CPLCalloc(nBlockXSize,nBlockYSize); |
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| | 1254 | |
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| | 1255 | nLineOffset = (nBlockXSize * poGDS->nBitsPerSample + 7) / 8; |
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| | 1256 | |
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| | 1257 | for( iLine = 0; iLine < nBlockYSize; iLine++ ) |
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| | 1258 | { |
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| | 1259 | GDALCopyBits( (GByte *) pImage, |
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| | 1260 | iLine*nBlockXSize*8 + 8 - poGDS->nBitsPerSample, 8, |
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| | 1261 | pabyOddImg, |
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| | 1262 | iLine * nLineOffset * 8, poGDS->nBitsPerSample, |
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| | 1263 | poGDS->nBitsPerSample, nBlockXSize ); |
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| | 1264 | } |
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| | 1265 | |
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| | 1266 | // Then write as appropriate. |
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| | 1267 | nBlockId = nBlockXOff + nBlockYOff * nBlocksPerRow |
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| | 1268 | + (nBand-1) * poGDS->nBlocksPerBand; |
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| | 1269 | |
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| | 1270 | if( TIFFIsTiled(poGDS->hTIFF) ) |
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| | 1271 | { |
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| | 1272 | nBlockBufSize = TIFFTileSize( poGDS->hTIFF ); |
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| | 1273 | if( TIFFWriteEncodedTile( poGDS->hTIFF, nBlockId, pabyOddImg, |
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| | 1274 | nBlockBufSize ) == -1 ) |
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| | 1275 | eErr = CE_Failure; |
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| | 1276 | } |
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| | 1277 | else |
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| | 1278 | { |
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| | 1279 | nBlockBufSize = TIFFStripSize( poGDS->hTIFF ); |
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| | 1280 | if( TIFFWriteEncodedStrip( poGDS->hTIFF, nBlockId, pabyOddImg, |
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| | 1281 | nBlockBufSize ) == -1 ) |
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| | 1282 | eErr = CE_Failure; |
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| | 1283 | } |
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| | 1284 | |
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| | 1285 | CPLFree( pabyOddImg ); |
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| | 1286 | |
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| | 1287 | return eErr; |
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