colourmat.cpp

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// $Id: colourmat.cpp 1402 2006-07-04 09:26:38Z alex $
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 */


#include "camtypes.h"

#include "colourmat.h"

/********************************************************************************************

>   ColourVector ColourVector::Apply(ColourMatrix &cm)


    Author:     Alex_Bligh <alex@alex.org.uk>
    Created:    24/01/2005
    Inputs:     cm - Colour matrix to operate on
    Outputs:    
    Returns:    The matrix multiplied colour vector
    Purpose:    Multiplies a ColourVector by a ColourMatrix and returns the result
    Errors:     -
    SeeAlso:    -

                    ( a1 a2 a3 a4 a5 )
                    ( b1 b2 b3 b4 b5 )
    ( a b c d e )   ( c1 c2 c3 c4 c5 ) = (a*a1+b*b1+c*c1+d*d1+e*e1, a*a2+b*b2+c*c2+d*d2+e*e2 etc.)
                    ( d1 d2 d3 d4 d5 )
                    ( e1 e2 e3 e4 e5 )

********************************************************************************************/

ColourVector ColourVector::Apply(ColourMatrix &cm)
{
    ColourVector result;
    INT32 i, j;

    for (i=0; i<5; i++) // Column of matrix
    {
        result.elements[i] = 0.0;
        for (j=0 ; j<5 ; j++) // Row of matrix
        {
            result.elements[i]+=elements[j] * cm.elements.el[i+j*5];
        }
    }
    result.elements[Spare]=1.0; // Fix this up in case of rounding peculiarities
    return result;
}

/********************************************************************************************

>   static ColourMatrix ColourMatrix::Boost(double d=1.2)


    Author:     Alex_Bligh <alex@alex.org.uk>
    Created:    24/01/2005
    Inputs:     d - boost quantity
    Outputs:    
    Returns:    A matrix which boosts colour
    Purpose:    -
    Errors:     -
    SeeAlso:    -

********************************************************************************************/

ColourMatrix ColourMatrix::Boost(double d)
{
    ColourMatrix r;
    if (d != 1.0)
    {
        double cc = (1.0-d)/2.0; // Add constant boost to centre colour change
        elements_t e = {
            { d,   0.0, 0.0, 0.0, 0.0,
            0.0, d,   0.0, 0.0, 0.0,
            0.0, 0.0, d,   0.0, 0.0,
            0.0, 0.0, 0.0, 1.0, 0.0,
            cc,  cc,  cc,  0.0, 1.0 }
            };
        r.elements = e;
    }
    return r;
}

/********************************************************************************************

>   static ColourMatrix ColourMatrix::Whiten()


    Author:     Alex_Bligh <alex@alex.org.uk>
    Created:    24/01/2005
    Inputs:     None
    Outputs:    
    Returns:    A matrix which makes the entire image white
    Purpose:    -
    Errors:     -
    SeeAlso:    -

********************************************************************************************/

ColourMatrix ColourMatrix::Whiten()
{
    ColourMatrix r;
    elements_t e = {
        { 0.0, 0.0, 0.0, 0.0, 0.0,
        0.0, 0.0, 0.0, 0.0, 0.0,
        0.0, 0.0, 0.0, 0.0, 0.0,
        0.0, 0.0, 0.0, 1.0, 0.0,
        1.0, 1.0, 1.0, 0.0, 1.0 }
        };
    r.elements=e;
    return r;
}

/********************************************************************************************

>   static ColourMatrix ColourMatrix::Grey()


    Author:     Alex_Bligh <alex@alex.org.uk>
    Created:    24/01/2005
    Inputs:     d - boost quantity
    Outputs:    
    Returns:    A matrix which greys the image
    Purpose:    -
    Errors:     -
    SeeAlso:    -

********************************************************************************************/

ColourMatrix ColourMatrix::Grey()
{
    ColourMatrix r;
    elements_t e = {
        { 0.1, 0.1, 0.1, 0.0, 0.0,
        0.1, 0.1, 0.1, 0.0, 0.0,
        0.1, 0.1, 0.1, 0.0, 0.0,
        0.0, 0.0, 0.0, 1.0, 0.0,
        0.6, 0.6, 0.6, 0.0, 1.0 }
        };
    r.elements=e;
    return r;
}






#if 0
The control makes a Hot version of a button face from a Normal version at render time if a Hot version was not loaded from the resource system. And the control always makes grey versions using the same techniques:


double colourboost = 1.0;
// If glyph is highlighted but button should be normal, knock it back a bit
// Else if glyph is normal but button should be highlighted, boost it up
if ((BBX_HIGHLIGHT_ID(BMPIndex)) && !(ISSELECTED(hwnd) || (flags & BS_POINTEROVER)))
    colourboost = 0.8;
else if (!(BBX_HIGHLIGHT_ID(BMPIndex)) && (ISSELECTED(hwnd) || (flags & BS_POINTEROVER)))
    colourboost = 1.2;

PlotGdiPlusBitmap(hDC, pShared->pGPBitmap, SrcOffset,
xPlotOffset, yPlotOffset, XSize, YSize,
ISDISABLED(hwnd), colourboost, BGColour);


static void PlotGdiPlusBitmap   (HDC destDC, CGdiPlusBitmap* pBitmap, INT32 SrcOffset,
                                INT32 xPlotOffset,INT32 yPlotOffset, INT32 width, INT32 height,
                                BOOL Shaded, double colourboost, INT32 BGColour)
{
    // Always fill the entire background with BTNFACE (grey) to make sure we don't
    // miss any pixels - we don't need to be careful about redraw flicker etc
    // now that we're plotting into an offscreen bitmap.
    
    if (pBitmap == NULL)
        return;
    
    Graphics graphics(destDC);
    Status stat;
    
    Gdiplus::Rect faceRect(0, 0, MAXBITMAPSIZE, MAXBITMAPSIZE);
    
    Brush* pHighlightBrush = NULL;
    switch (BGColour)
    {
        case BGCOLOUR_LTGREY:
        {
            Color face;
            face.SetFromCOLORREF(GetSysColor(COLOR_BTNHIGHLIGHT));
            pHighlightBrush = new SolidBrush(face);
        }
        break;
        
        case BGCOLOUR_CREAM:
        {
            pHighlightBrush = new SolidBrush(Color(255, 255, 192));
            // Color face;
            // face.SetFromCOLORREF(GetSysColor(COLOR_BTNSHADOW));
            // pHighlightBrush = new LinearGradientBrush(faceRect, Color(255,255,192), face, LinearGradientModeVertical);
        }
        break;
        
        default:
        {
            Color face;
            face.SetFromCOLORREF(GetSysColor(COLOR_BTNFACE));
            pHighlightBrush = new SolidBrush(face);
        }
        break;
    }
    
    graphics.FillRectangle(pHighlightBrush, 0, 0, MAXBITMAPSIZE, MAXBITMAPSIZE);
    stat = graphics.GetLastStatus();
    
    if (Shaded)
    {
        // Button is shaded (greyed)
        // Make a colour transform here to set all pixels to white
        ImageAttributes effect;
        ColorMatrix whiteMatrix = {
        0.0f, 0.0f, 0.0f, 0.0f, 0.0f,
        0.0f, 0.0f, 0.0f, 0.0f, 0.0f,
        0.0f, 0.0f, 0.0f, 0.0f, 0.0f,
        0.0f, 0.0f, 0.0f, 1.0f, 0.0f,
        1.0f, 1.0f, 1.0f, 0.0f, 1.0f
        };
    
        effect.SetColorMatrix(&whiteMatrix);
        
        // Plot white version of glyph first, with slight offset
        Gdiplus::Rect destRect(xPlotOffset+1, yPlotOffset+1, width, height);
        graphics.DrawImage(pBitmap->m_pBitmap, destRect, SrcOffset, 0, width, height, UnitPixel, &effect);
        stat = graphics.GetLastStatus();
        
        // Make a colour transform here to remove hue from the pixels
        ColorMatrix greyMatrix = {
        0.1f, 0.1f, 0.1f, 0.0f, 0.0f,
        0.1f, 0.1f, 0.1f, 0.0f, 0.0f,
        0.1f, 0.1f, 0.1f, 0.0f, 0.0f,
        0.0f, 0.0f, 0.0f, 1.0f, 0.0f,
        0.6f, 0.6f, 0.6f, 0.0f, 1.0f
        };
        
        effect.SetColorMatrix(&greyMatrix);
        
        // Plot greyed out glyph over the top
        Gdiplus::Rect destRect2(xPlotOffset, yPlotOffset, width, height);
        graphics.DrawImage(pBitmap->m_pBitmap, destRect2, SrcOffset, 0, width, height, UnitPixel, &effect);
        stat = graphics.GetLastStatus();
        
    }
    else
    {
        // Button is not shaded but may have it colour boosted or diminished
        // to indicate other things...
        // Make a colour transform here to apply colour boost
        ImageAttributes effect;
        if (colourboost!=1.0)
        {
            float cb = (float)colourboost;
            float cc = (1.0f-cb)/2.0f; // Add constant boost to centre colour change
            ColorMatrix boostMatrix = {
            cb, 0.0f, 0.0f, 0.0f, 0.0f,
            0.0f, cb, 0.0f, 0.0f, 0.0f,
            0.0f, 0.0f, cb, 0.0f, 0.0f,
            0.0f, 0.0f, 0.0f, 1.0f, 0.0f,
            cc, cc, cc, 0.0f, 1.0f
            };
        
            effect.SetColorMatrix(&boostMatrix);
        }

        Gdiplus::Rect destRect(xPlotOffset, yPlotOffset, width, height);
        graphics.DrawImage(pBitmap->m_pBitmap, destRect, SrcOffset, 0, width, height, UnitPixel, &effect);
        stat = graphics.GetLastStatus();
    }
        
    delete pHighlightBrush;
    pHighlightBrush = NULL;
    
}

Info about GDI+ colour matrix here:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/gdicpp/GDIPlus/UsingGDIPlus/Recoloring.asp

Phil
#endif

---