diff options
Diffstat (limited to 'core/src/fxcodec')
| -rw-r--r-- | core/src/fxcodec/codec/fx_codec_flate.cpp | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/core/src/fxcodec/codec/fx_codec_flate.cpp b/core/src/fxcodec/codec/fx_codec_flate.cpp index a12fffbe5c..e17c32a2c7 100644 --- a/core/src/fxcodec/codec/fx_codec_flate.cpp +++ b/core/src/fxcodec/codec/fx_codec_flate.cpp @@ -524,17 +524,19 @@ static void TIFF_PredictorEncode(FX_LPBYTE& data_buf, FX_DWORD& data_size, static void TIFF_PredictLine(FX_LPBYTE dest_buf, int row_size, int BitsPerComponent, int Colors, int Columns) { if (BitsPerComponent == 1) { - int row_bits = BitsPerComponent * Colors * Columns; + int row_bits = FX_MIN(BitsPerComponent * Colors * Columns, row_size * 8); + int index_pre = 0; + int col_pre = 0; for(int i = 1; i < row_bits; i ++) { int col = i % 8; int index = i / 8; - int index_pre = (col == 0) ? (index - 1) : index; - int col_pre = (col == 0) ? 8 : col; - if( ((dest_buf[index] >> (7 - col)) & 1) ^ ((dest_buf[index_pre] >> (8 - col_pre)) & 1) ) { + if( ((dest_buf[index] >> (7 - col)) & 1) ^ ((dest_buf[index_pre] >> (7 - col_pre)) & 1) ) { dest_buf[index] |= 1 << (7 - col); } else { dest_buf[index] &= ~(1 << (7 - col)); } + index_pre = index; + col_pre = col; } return; } |