194 count_filters(png_structp png_ptr, png_row_infop row_info, png_bytep data)  in count_filters()  argument
196    if (png_ptr != NULL && row_info != NULL)  in count_filters()
209 count_zero_samples(png_structp png_ptr, png_row_infop row_info, png_bytep data)  in count_zero_samples()  argument
226     if (row_info->color_type == 0 || row_info->color_type == 3)  in count_zero_samples()
231        for (n = 0, nstop=row_info->width; n<nstop; n++)  in count_zero_samples()
233           if (row_info->bit_depth == 1)  in count_zero_samples()
245           if (row_info->bit_depth == 2)  in count_zero_samples()
257           if (row_info->bit_depth == 4)  in count_zero_samples()
269           if (row_info->bit_depth == 8)  in count_zero_samples()
273           if (row_info->bit_depth == 16)  in count_zero_samples()
285        int color_channels = row_info->channels;  in count_zero_samples()
286        if (row_info->color_type > 3)color_channels--;  in count_zero_samples()
288        for (n = 0, nstop=row_info->width; n<nstop; n++)  in count_zero_samples()
292              if (row_info->bit_depth == 8)  in count_zero_samples()
296              if (row_info->bit_depth == 16)  in count_zero_samples()
304           if (row_info->color_type > 3)  in count_zero_samples()
307              if (row_info->bit_depth == 16)  in count_zero_samples()