[Boost-users] [GIL]

Subject: [Boost-users] [GIL]
From: Eloi Du Bois (eloi.du.bois_at_[hidden])
Date: 2009-12-15 08:01:08

Hi all,

Sorry to bother you with my problems but I am experiencing a new probable
bug:
I am trying to manage with data that are set as follow:
P;P;P;P;......
Where P is a rgb pixel (10 bits per components) packed on an uint32 as
follow:
00RGB;00RGB;00RGB;00RGB........
I mean there is two bits unused on each 32 bits pixel.

So I tried to set up a view using packed_pixel and a bug occurs when using
copy_and_convert_pixels...
The very strange thing is that it is working when using color_convert on two
pixels...
I think there may exist something I didn't understood... Anyway, I give you
the buggy code:

        /// 10 bits rgb packed to uint32_t starting at the 2nd bit
        typedef const packed_channel_reference<uint32_t, 22, 10, true>
rgb10_packed_channel0_t;
        typedef const packed_channel_reference<uint32_t, 12, 10, true>
rgb10_packed_channel1_t;
        typedef const packed_channel_reference<uint32_t, 02, 10, true>
rgb10_packed_channel2_t;
        typedef mpl::vector3<rgb10_packed_channel0_t,
rgb10_packed_channel1_t, rgb10_packed_channel2_t> rgb10_packed_channels_t;
        typedef packed_pixel<uint32_t, rgb10_packed_channels_t,
rgb_layout_t> rgb10_packed_pixel_t;
        typedef view_type_from_pixel<rgb10_packed_pixel_t>::type
rgb10_packed_view_t;

        // image data of dimension: {w,h} = {1,0}
        uint32_t *data=new uint32_t[1];
        data[0] = 0xFFFFF00C;
        rgb10_packed_view_t vw10 =
                interleaved_view( 1, 0, (rgb10_packed_pixel_t*)( data ),
sizeof( uint32_t ) );
        rgb10_packed_pixel_t pix10 = *vw10.row_begin(0);
        rgb16_pixel_t pix16;
        // This is working
        color_convert(pix10, pix16);
        std::cout << "Right {R,G,B}={" << get_color(pix16, red_t()) << ","
                                       << get_color(pix16, green_t()) << ","
                                       << get_color(pix16, blue_t()) << "}"
                  << std::endl;
        // Assert that are ok
        assert( get_color( pix16, red_t()     ) == 0xFFFF );
        assert( get_color( pix16, green_t()   ) == 0xFFFF );
        assert( get_color( pix16, blue_t()    ) == 0x00C0 );

        rgb16_image_t img16(vw10.width(), vw10.height());
        rgb16_view_t vw16(view(img16));

        // This isn't working with packed_view
        copy_and_convert_pixels(vw10, vw16);
        pix16 = *vw16.row_begin(0);
        std::cout << "Wrong {R,G,B}={" << get_color(pix16, red_t()) << ","
                                       << get_color(pix16, green_t()) << ","
                                       << get_color(pix16, blue_t()) << "}"
                  << std::endl;
        // Assert that doesn't pass
        assert( get_color( pix16, red_t()     ) == 0xFFFF );
        assert( get_color( pix16, green_t()   ) == 0xFFFF );
        assert( get_color( pix16, blue_t()    ) == 0x00C0 );

Hope this will help,
Eloi.