diff options
Diffstat (limited to 'pngwtran.c')
| -rw-r--r-- | pngwtran.c | 40 |
1 files changed, 18 insertions, 22 deletions
diff --git a/pngwtran.c b/pngwtran.c index 98703f8c8..d3d47f3fb 100644 --- a/pngwtran.c +++ b/pngwtran.c @@ -1,8 +1,8 @@ /* pngwtran.c - transforms the data in a row for PNG writers * - * Last changed in libpng 1.6.0 [February 14, 2013] - * Copyright (c) 1998-2013 Glenn Randers-Pehrson + * Last changed in libpng 1.6.0 [(PENDING RELEASE)] + * Copyright (c) 1998-2012 Glenn Randers-Pehrson * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) * @@ -287,7 +287,7 @@ png_do_shift(png_row_infop row_info, png_bytep row, { png_bytep bp = row; png_size_t i; - unsigned int mask; + png_byte mask; png_size_t row_bytes = row_info->rowbytes; if (bit_depth->gray == 1 && row_info->bit_depth == 2) @@ -301,22 +301,20 @@ png_do_shift(png_row_infop row_info, png_bytep row, for (i = 0; i < row_bytes; i++, bp++) { + png_uint_16 v; int j; - unsigned int v, out; v = *bp; - out = 0; + *bp = 0; for (j = shift_start[0]; j > -shift_dec[0]; j -= shift_dec[0]) { if (j > 0) - out |= v << j; + *bp |= (png_byte)((v << j) & 0xff); else - out |= (v >> (-j)) & mask; + *bp |= (png_byte)((v >> (-j)) & mask); } - - *bp = (png_byte)(out & 0xff); } } @@ -329,23 +327,21 @@ png_do_shift(png_row_infop row_info, png_bytep row, for (i = 0; i < istop; i++, bp++) { - const unsigned int c = i%channels; + png_uint_16 v; int j; - unsigned int v, out; + int c = (int)(i%channels); v = *bp; - out = 0; + *bp = 0; for (j = shift_start[c]; j > -shift_dec[c]; j -= shift_dec[c]) { if (j > 0) - out |= v << j; + *bp |= (png_byte)((v << j) & 0xff); else - out |= v >> (-j); + *bp |= (png_byte)((v >> (-j)) & 0xff); } - - *bp = (png_byte)(out & 0xff); } } @@ -357,22 +353,22 @@ png_do_shift(png_row_infop row_info, png_bytep row, for (bp = row, i = 0; i < istop; i++) { - const unsigned int c = i%channels; + int c = (int)(i%channels); + png_uint_16 value, v; int j; - unsigned int value, v; - v = png_get_uint_16(bp); + v = (png_uint_16)(((png_uint_16)(*bp) << 8) + *(bp + 1)); value = 0; for (j = shift_start[c]; j > -shift_dec[c]; j -= shift_dec[c]) { if (j > 0) - value |= v << j; + value |= (png_uint_16)((v << j) & (png_uint_16)0xffff); else - value |= v >> (-j); + value |= (png_uint_16)((v >> (-j)) & (png_uint_16)0xffff); } - *bp++ = (png_byte)((value >> 8) & 0xff); + *bp++ = (png_byte)(value >> 8); *bp++ = (png_byte)(value & 0xff); } } |