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DummyFrameProvider.h

Go to the documentation of this file.

#ifndef Impala_Core_Stream_DummyFrameProvider_h
#define Impala_Core_Stream_DummyFrameProvider_h

#include "Core/Array/Arrays.h"
#include "Core/Table/TableTem.h"

namespace Impala
{
namespace Core
{
namespace Stream
{


class DummyFrameProvider
{

public:

    static UInt8*
    DataPtr(int width, int height)
    {
        static DummyFrameProvider instance;
        return instance.GetDataPtr(width, height);
    }
    
private:

    typedef Table::TableTem< Column::ColumnTem<int>,
                             Column::ColumnTem<int>,
                             Column::ColumnTem<Array::Array2dVec3UInt8*> > DummyFrameTable;

    DummyFrameProvider() : mDummyFrames(DummyFrameTable(1))
    {
    }

    ~DummyFrameProvider()
    {
        for (int idx = 0; idx < mDummyFrames.Size(); idx++)
        {
            Array::Array2dVec3UInt8* image = mDummyFrames.Get3(idx);
            delete image;
        }
    }

    UInt8*
    GetDataPtr(int width, int height)
    {
        for (int idx = 0 ; idx < mDummyFrames.Size(); idx++)
        {
            if (mDummyFrames.Get1(idx) == width &&
                mDummyFrames.Get2(idx) == height)
            {
                Array::Array2dVec3UInt8* image = mDummyFrames.Get3(idx);
                return image->mData;
            }
        }

        Array::Array2dVec3UInt8* image = 
            new Array::Array2dVec3UInt8(width, height, 0, 0);
        const Array::Element::Vec3Int32 black(0, 0, 0);
        for (int x = 0; x < width; x++)
            for (int y = 0; y < height; y++)
                image->SetValue(black, x, y);
        int halfTheWidth = (width + 1) / 2;

        // make the dummy frame visually distinct from real black frames
        // draw a cross
        const Array::Element::Vec3Int32 contrastColor(255, 255, 0);
        double y1 = 0;
        double y2 = 0.5;
        double yDelta = (height - 1.0) / (width - 1.0);
        for (int x = 0; x < halfTheWidth; x++)
        {
            image->SetValue(contrastColor, x, (int) y1);
            image->SetValue(contrastColor, x, (int) y2);

            image->SetValue(contrastColor, x, height - 1 - (int) y1);
            image->SetValue(contrastColor, x, height - 1 - (int) y2);

            image->SetValue(contrastColor, width - 1 - x, (int) y1);
            image->SetValue(contrastColor, width - 1 - x, (int) y2);

            image->SetValue(contrastColor, width - 1 - x, height - 1 - (int) y1);
            image->SetValue(contrastColor, width - 1 - x, height - 1 - (int) y2);

            y1 += yDelta;
            y2 += yDelta;
        }
        mDummyFrames.Add(width, height, image);
        return image->mData;
    }


    DummyFrameTable mDummyFrames;

    ILOG_VAR_DECL;
};



ILOG_VAR_INIT(DummyFrameProvider, Impala.Core.Stream);

} // namespace Stream
} // namespace Core
} // namespace Impala

#endif

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