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(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 struct ConvertRGBA_impl : public default_color_converter_impl {}; // Override GIL's from-RGBA color converter template<typename TDstColorSpace> struct ConvertRGBA_impl { template void operator () (const TSrcPixel& srcPixel, TDstPixel& dstPixel) const; }; struct ConvertRGBA { template void operator () (const TSrcPixel& srcPixel, TDstPixel& dstPixel) const; }; template<typename TDstColorSpace> template void ConvertRGBA_impl::operator () (const TSrcPixel& srcPixel, TDstPixel& dstPixel) const { default_color_converter_impl() ( pixel ( get_color(srcPixel, red_t()), get_color(srcPixel, green_t()), get_color(srcPixel, blue_t()) ), dstPixel ); } template 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()(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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Hi,

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.

Don't quite understand what do you want to achieve with GIL but to make a raw memory usable by GIL algorithms you need a proper view. Views are abstractions over underlying pixel representation so that algorithms may operate on the data regardless of storage / layout. As long as views are compatible (same dimmensions, channel count etc) all will work fine. For example in my code (source data is decoded theora video frame): gil::interleaved_view(frame->getWidth(), frame->getHeight(), (gil::rgb8_pixel_t*) frame->getBuffer(), frame->getStride() * 3); frame->getBuffer() is pointer to first byte of RGB data, last param is scanline length in bytes. You could use it like this: rgb8_image_t img(frame->getWidth(), frame->getHeight()); copy_pixels(gil::interleaved_view(frame->getWidth(), frame->getHeight(), (gil::rgb8_pixel_t*) frame->getBuffer(), frame->getStride() * 3), img); I guess in your case pixel ptr is pDIB and the rest of params has to be taken from the image header. Hope this helps. Cheers, Simon -- Szymon Gatner The Lordz Games Studio www.thelordzgamesstudio.com