diff options
Diffstat (limited to 'jpeg/jidctint.c')
| -rw-r--r-- | jpeg/jidctint.c | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/jpeg/jidctint.c b/jpeg/jidctint.c index 8f871e81..8881a8f2 100644 --- a/jpeg/jidctint.c +++ b/jpeg/jidctint.c @@ -2,7 +2,7 @@ * jidctint.c * * Copyright (C) 1991-1998, Thomas G. Lane. - * Modification developed 2002-2016 by Guido Vollbeding. + * Modification developed 2002-2018 by Guido Vollbeding. * This file is part of the Independent JPEG Group's software. * For conditions of distribution and use, see the accompanying README file. * @@ -1504,7 +1504,7 @@ jpeg_idct_10x10 (j_decompress_ptr cinfo, jpeg_component_info * compptr, /* * Perform dequantization and inverse DCT on one block of coefficients, - * producing a 11x11 output block. + * producing an 11x11 output block. * * Optimized algorithm with 24 multiplications in the 1-D kernel. * cK represents sqrt(2) * cos(K*pi/22). @@ -3728,7 +3728,7 @@ jpeg_idct_10x5 (j_decompress_ptr cinfo, jpeg_component_info * compptr, /* * Perform dequantization and inverse DCT on one block of coefficients, - * producing a 8x4 output block. + * producing an 8x4 output block. * * 4-point IDCT in pass 1 (columns), 8-point in pass 2 (rows). */ @@ -3890,7 +3890,7 @@ jpeg_idct_8x4 (j_decompress_ptr cinfo, jpeg_component_info * compptr, /* * Perform dequantization and inverse DCT on one block of coefficients, - * producing a reduced-size 6x3 output block. + * producing a 6x3 output block. * * 3-point IDCT in pass 1 (columns), 6-point in pass 2 (rows). */ @@ -4142,7 +4142,7 @@ jpeg_idct_2x1 (j_decompress_ptr cinfo, jpeg_component_info * compptr, /* * Perform dequantization and inverse DCT on one block of coefficients, - * producing a 8x16 output block. + * producing an 8x16 output block. * * 16-point IDCT in pass 1 (columns), 8-point in pass 2 (rows). */ @@ -4956,6 +4956,8 @@ jpeg_idct_4x8 (j_decompress_ptr cinfo, jpeg_component_info * compptr, */ z2 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); + if (ctr == 4) + CLAMP_DC(z2); z3 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); z2 <<= CONST_BITS; z3 <<= CONST_BITS; @@ -5075,7 +5077,7 @@ jpeg_idct_4x8 (j_decompress_ptr cinfo, jpeg_component_info * compptr, /* * Perform dequantization and inverse DCT on one block of coefficients, - * producing a reduced-size 3x6 output block. + * producing a 3x6 output block. * * 6-point IDCT in pass 1 (columns), 3-point in pass 2 (rows). */ |