[devel] Ensure that png_rgb_to_gray ignores palette mapped images.
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@ -2427,7 +2427,7 @@ png_do_rgb_to_gray(png_structp png_ptr, png_row_infop row_info, png_bytep row)
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png_debug(1, "in png_do_rgb_to_gray");
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if (
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if (!(row_info->color_type & PNG_COLOR_MASK_PALETTE) &&
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(row_info->color_type & PNG_COLOR_MASK_COLOR))
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{
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png_uint_32 rc = png_ptr->rgb_to_gray_red_coeff;
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