BilinearScalerInternal_X1Y12.cpp

Go to the documentation of this file.

/*
Copyright (C) 2005 The Pentagram Team

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
*/

#include "pent_include.h"
#include "BilinearScalerInternal.h"
#include "Manips.h"


namespace Pentagram {

template<class uintX, class Manip, class uintS> 
bool BilinearScalerInternal_X1Y12(Texture *tex, sint32 sx, sint32 sy, sint32 sw, sint32 sh, 
                                                uint8* pixel, sint32 dw, sint32 dh, sint32 pitch, bool clamp_src)
{
        // Source buffer pointers
        uintS *texel = reinterpret_cast<uintS*>(tex->buffer) + (sy * tex->width + sx);
        int tpitch = tex->width;
        uintS *tline_end = texel + (sw);
        uintS *tex_end = texel + (sh-5)*tex->width;
        int tex_diff = (tex->width*5) - sw;

        uint8 a[4], b[4], c[4], d[4], e[4], l[4];
        uint8 cols[6][4];

        bool clip_y = true;
        if (sh+sy < tex->height && clamp_src == false)
        {
                clip_y = false;
                tex_end = texel + (sh)*tex->width;
        }

        // Src Loop Y
        do {
                // Src Loop X
                do {
                        Read6(a,b,c,d,e,l);
                        texel++;

                        X1xY12xDoCols();
                        X1xY12xInnerLoop();
                        pixel -= pitch*6-sizeof(uintX);

                } while (texel != tline_end);

                pixel += pitch*6-sizeof(uintX)*(dw);
                texel += tex_diff;
                tline_end += tpitch*5;

        } while (texel != tex_end);


        //
        // Final Rows - Clipping
        //

        // Src Loop Y
        if (clip_y) {
                // Src Loop X
                do {
                        Read6_Clipped(a,b,c,d,e,l);
                        texel++;

                        X1xY12xDoCols();
                        X1xY12xInnerLoop();
                        pixel -= pitch*6-sizeof(uintX);

                } while (texel != tline_end);
        }

        return true;
}

InstantiateBilinearScalerFunc(BilinearScalerInternal_X1Y12);

};

---