static void handle_16(reader& io)
{
if (io.get_bit_depth() == 16 && traits::get_bit_depth() == 8)
{
#ifdef PNG_READ_16_TO_8_SUPPORTED
io.set_strip_16();
#else
throw error("expected 8-bit data but found 16-bit;"
" recompile with PNG_READ_16_TO_8_SUPPORTED");
#endif
}
if (io.get_bit_depth() != 16 && traits::get_bit_depth() == 16)
{
#ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
io.set_read_user_transform(expand_8_to_16);
io.set_user_transform_info(NULL, 16,
traits::get_channels());
#else
throw error("expected 16-bit data but found 8-bit;"
" recompile with"
" PNG_READ_USER_TRANSFORM_SUPPORTED");
#endif
}
}
static void handle_gray(reader& io)
{
if ((io.get_color_type() & ~color_mask_alpha)
== color_type_gray)
{
if (io.get_bit_depth() < 8 && traits::get_bit_depth() >= 8)
{
#ifdef PNG_READ_EXPAND_SUPPORTED
io.set_gray_1_2_4_to_8();
#else
throw error("convert_color_space: expected 8-bit data;"
" recompile with"
" PNG_READ_EXPAND_SUPPORTED");
#endif
}
}
}