Hi Mark,

You may construct an image view backed by your array. ie, make an image_view that is a view into your array. This way, you avoid a superfluous memory copy. Here's an example of the idea from some of my own code:

bgra8c_view_t imageView( interleaved_view( qImage.width(),

                                           qImage.height(),

                                           reinterpret_cast<bgra8c_pixel_t*>(qImage.constBits()),

                                           qImage.bytesPerLine() ) ); 

You may need to change bgra8c_pixel_t to match the DIB layout. If the DIB does include an alpha channel, be aware that boost::gil expects pre-multiplied alpha. Here is a little code of I wrote to help with that:

// GIL's from-RGBA color converter assumes premultiplied alpha, but we do not use premultiplied alpha. Consequently, GIL does

// not produce the desired results when it converts pixels from RGBA or ARGB color space to RGB.  This may be remedied by

// using the ConvertRGBA color convertor.  For example: copy_and_convert_pixels(srcRGBAView, dstRGBView, ConvertRGBA())

// Default to color converters provided by GIL

template<typename TSrcColorSpace, typename TDstColorSpace>

struct ConvertRGBA_impl

  : public default_color_converter_impl<TSrcColorSpace, TDstColorSpace> {};

// Override GIL's from-RGBA color converter

template<typename TDstColorSpace>

struct ConvertRGBA_impl<rgba_t, TDstColorSpace>

{

	template<typename TSrcPixel, typename TDstPixel>

	void operator () (const TSrcPixel& srcPixel, TDstPixel& dstPixel) const;

};

struct ConvertRGBA

{

	template<typename TSrcPixel, typename TDstPixel>

	void operator () (const TSrcPixel& srcPixel, TDstPixel& dstPixel) const;

}; 

template<typename TDstColorSpace>

template<typename TSrcPixel, typename TDstPixel>

void ConvertRGBA_impl<rgba_t, TDstColorSpace>::operator () (const TSrcPixel& srcPixel, TDstPixel& dstPixel) const

{

	default_color_converter_impl<rgb_t, TDstColorSpace>()

	(

		pixel<typename channel_type<TSrcPixel>::type, rgb_layout_t>

		(

			get_color(srcPixel, red_t()),

			get_color(srcPixel, green_t()),

			get_color(srcPixel, blue_t())

		),

		dstPixel

	);

}

template<typename TSrcPixel, typename TDstPixel>

void ConvertRGBA::operator () (const TSrcPixel& srcPixel, TDstPixel& dstPixel) const

{

	typedef typename color_space_type<TSrcPixel>::type TSrcColorSpace;

	typedef typename color_space_type<TDstPixel>::type TDstColorSpace;

	ConvertRGBA_impl<TSrcColorSpace, TDstColorSpace>()(srcPixel, dstPixel);

} 

-Erik

On Tuesday 29 November 2011 4:29:40 PM Sapp, Mark wrote:

> Hi All,

>

>

>

> Can anyone point me in the right directions for copying or assigning an

> array in memory to an image? I'm reading an frame out of an AVI file

> using Microsoft's vfw32.lib/vfw.h and the function that grabs the frame

> returns a pointer to a bitmap in memory, like this:

>

>

>

> BYTE* pDIB = (BYTE*) AVIStreamGetFrame(pFrame, index);

>

>

>

> And I need to transfer that information into an image. I have extracted

> the bitmap header and have a pointer to the first pixel, so I suppose I

> could iterate over each pixel and channel and populate the image by

> hand, but I imagine there is a better way.

>

>

>

> Thanks,

>

> Mark Sapp

>

>

>

>

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