diff options
Diffstat (limited to 'pngrtran.c')
| -rw-r--r-- | pngrtran.c | 22 |
1 files changed, 16 insertions, 6 deletions
diff --git a/pngrtran.c b/pngrtran.c index af1aa8e4a..6f06d6f66 100644 --- a/pngrtran.c +++ b/pngrtran.c @@ -1,8 +1,8 @@ /* pngrtran.c - transforms the data in a row for PNG readers * - * Last changed in libpng 1.2.43 [February 25, 2010] - * Copyright (c) 1998-2010 Glenn Randers-Pehrson + * Last changed in libpng 1.2.45 [June 30, 2011] + * Copyright (c) 1998-2011 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.) * @@ -676,10 +676,21 @@ void PNGAPI png_set_rgb_to_gray(png_structp png_ptr, int error_action, double red, double green) { - int red_fixed = (int)((float)red*100000.0 + 0.5); - int green_fixed = (int)((float)green*100000.0 + 0.5); + int red_fixed, green_fixed; if (png_ptr == NULL) return; + if (red > 21474.83647 || red < -21474.83648 || + green > 21474.83647 || green < -21474.83648) + { + png_warning(png_ptr, "ignoring out of range rgb_to_gray coefficients"); + red_fixed = -1; + green_fixed = -1; + } + else + { + red_fixed = (int)((float)red*100000.0 + 0.5); + green_fixed = (int)((float)green*100000.0 + 0.5); + } png_set_rgb_to_gray_fixed(png_ptr, error_action, red_fixed, green_fixed); } #endif @@ -1196,8 +1207,7 @@ png_read_transform_info(png_structp png_ptr, png_infop info_ptr) { if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) { - if (png_ptr->num_trans && - (png_ptr->transformations & PNG_EXPAND_tRNS)) + if (png_ptr->num_trans) info_ptr->color_type = PNG_COLOR_TYPE_RGB_ALPHA; else info_ptr->color_type = PNG_COLOR_TYPE_RGB; |