png_set_bKGD     2083 3rdparty/libpng/png.h PNG_EXPORT(132, void, png_set_bKGD, (png_structp png_ptr, png_infop info_ptr,
png_set_bKGD     1762 3rdparty/libpng/pngrutil.c    png_set_bKGD(png_ptr, info_ptr, &background);