diff options
Diffstat (limited to 'third_party/libpng16/pngtrans.c')
| -rw-r--r-- | third_party/libpng16/pngtrans.c | 51 |
1 files changed, 18 insertions, 33 deletions
diff --git a/third_party/libpng16/pngtrans.c b/third_party/libpng16/pngtrans.c index 6882f0fd7b..7f8cc455d3 100644 --- a/third_party/libpng16/pngtrans.c +++ b/third_party/libpng16/pngtrans.c @@ -1,8 +1,8 @@ /* pngtrans.c - transforms the data in a row (used by both readers and writers) * - * Last changed in libpng 1.6.33 [September 28, 2017] - * Copyright (c) 1998-2002,2004,2006-2017 Glenn Randers-Pehrson + * Last changed in libpng 1.6.18 [July 23, 2015] + * Copyright (c) 1998-2002,2004,2006-2015 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.) * @@ -172,14 +172,13 @@ png_set_filler(png_structrp png_ptr, png_uint_32 filler, int filler_loc) * size! */ png_app_error(png_ptr, - "png_set_filler is invalid for" - " low bit depth gray output"); + "png_set_filler is invalid for low bit depth gray output"); return; } default: png_app_error(png_ptr, - "png_set_filler: inappropriate color type"); + "png_set_filler: inappropriate color type"); return; } # else @@ -514,15 +513,11 @@ png_do_strip_channel(png_row_infop row_info, png_bytep row, int at_start) if (at_start != 0) /* Skip initial filler */ ++sp; else /* Skip initial channel and, for sp, the filler */ - { - sp += 2; ++dp; - } + sp += 2, ++dp; /* For a 1 pixel wide image there is nothing to do */ while (sp < ep) - { - *dp++ = *sp; sp += 2; - } + *dp++ = *sp, sp += 2; row_info->pixel_depth = 8; } @@ -532,14 +527,10 @@ png_do_strip_channel(png_row_infop row_info, png_bytep row, int at_start) if (at_start != 0) /* Skip initial filler */ sp += 2; else /* Skip initial channel and, for sp, the filler */ - { - sp += 4; dp += 2; - } + sp += 4, dp += 2; while (sp < ep) - { - *dp++ = *sp++; *dp++ = *sp; sp += 3; - } + *dp++ = *sp++, *dp++ = *sp, sp += 3; row_info->pixel_depth = 16; } @@ -562,15 +553,11 @@ png_do_strip_channel(png_row_infop row_info, png_bytep row, int at_start) if (at_start != 0) /* Skip initial filler */ ++sp; else /* Skip initial channels and, for sp, the filler */ - { - sp += 4; dp += 3; - } + sp += 4, dp += 3; /* Note that the loop adds 3 to dp and 4 to sp each time. */ while (sp < ep) - { - *dp++ = *sp++; *dp++ = *sp++; *dp++ = *sp; sp += 2; - } + *dp++ = *sp++, *dp++ = *sp++, *dp++ = *sp, sp += 2; row_info->pixel_depth = 24; } @@ -580,16 +567,14 @@ png_do_strip_channel(png_row_infop row_info, png_bytep row, int at_start) if (at_start != 0) /* Skip initial filler */ sp += 2; else /* Skip initial channels and, for sp, the filler */ - { - sp += 8; dp += 6; - } + sp += 8, dp += 6; while (sp < ep) { /* Copy 6 bytes, skip 2 */ - *dp++ = *sp++; *dp++ = *sp++; - *dp++ = *sp++; *dp++ = *sp++; - *dp++ = *sp++; *dp++ = *sp; sp += 3; + *dp++ = *sp++, *dp++ = *sp++; + *dp++ = *sp++, *dp++ = *sp++; + *dp++ = *sp++, *dp++ = *sp, sp += 3; } row_info->pixel_depth = 48; @@ -609,7 +594,7 @@ png_do_strip_channel(png_row_infop row_info, png_bytep row, int at_start) return; /* The filler channel has gone already */ /* Fix the rowbytes value. */ - row_info->rowbytes = (png_size_t)(dp-row); + row_info->rowbytes = dp-row; } #endif @@ -707,8 +692,8 @@ png_do_check_palette_indexes(png_structrp png_ptr, png_row_infop row_info) * and this calculation is used because it avoids warnings that other * forms produced on either GCC or MSVC. */ - int padding = PNG_PADBITS(row_info->pixel_depth, row_info->width); - png_bytep rp = png_ptr->row_buf + row_info->rowbytes - 1; + int padding = (-row_info->pixel_depth * row_info->width) & 7; + png_bytep rp = png_ptr->row_buf + row_info->rowbytes; switch (row_info->bit_depth) { @@ -812,7 +797,7 @@ png_set_user_transform_info(png_structrp png_ptr, png_voidp (png_ptr->flags & PNG_FLAG_ROW_INIT) != 0) { png_app_error(png_ptr, - "info change after png_start_read_image or png_read_update_info"); + "info change after png_start_read_image or png_read_update_info"); return; } #endif |