IDXLUTBuilder interface

This interface enables you to construct a lookup table for an input DXSurface. A lookup table is a set of four arrays of 256 numbers each, with one array for each color channel and one array for the alpha channel.

Members

The IDXLUTBuilder interface inherits from the IUnknown interface. IDXLUTBuilder also has these types of members:

• Methods

Methods

The IDXLUTBuilder interface has these methods.

Remarks

Each color channel of each sample in an image is modified by a lookup table with the following code:

pBuffer[i].Color   = pColorLookupTable[pBuffer[i].Color];

In effect, this color value is used as an index to the modified color value stored in the lookup table array.

There are a number of standard color corrections that you can perform with Microsoft DirectX Transform lookup tables. These corrections are listed in the OPIDDXLUTBUILDER enumeration. You can also specify any number of color corrections in any order.

To use this interface, call the Component Object Model (COM)CoCreateInstance method as shown in the following code example.

   IDXLUTBuilder*  g_pLUTBuilder;
   hr = CoCreateInstance( CLSID_DXLUTBuilder, NULL, CLSCTX_INPROC,
                             IID_IDXLUTBuilder, (void **)&g_pLUTBuilder );
    ...                          
                         
   IDXLookupTable* g_pLUT;
   hr = g_pLUTBuilder->QueryInterface( IID_IDXLookupTable,
                                          (void **)&g_pLUT );

When you implement this interface, the call to the QueryInterface method should return an IDXLookupTable pointer. Use this pointer as a parameter to the IDXSurfaceModifier::SetLookup method to connect your lookup table to the DXSurfaceModifier object.

Requirements