BilinearScalerInternal_2x.cpp

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/*
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_2x(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-1);
        uintS *tex_end = texel + (sh-4)*tex->width;
        int tex_diff = (tex->width*4) - sw;

        uint8 a[4], b[4], c[4], d[4], e[4], f[4], g[4], h[4], i[4], j[4];
        int p_diff    = (pitch*8)-(dw*sizeof(uintX));

        bool clip_x = true;
        if (sw+sx < tex->width && clamp_src == false)
        {
                clip_x = false;
                tline_end = texel + (sw+1);
                tex_diff--;
        }

        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 {
                Read5(a,b,c,d,e);
                texel++;

                // Src Loop X
                do {
                        Read5(f,g,h,i,j);
                        texel++;

                        ScalePixel2x(a, b, f, g);
                        ScalePixel2x(b, c, g, h);
                        ScalePixel2x(c, d, h, i);
                        ScalePixel2x(d, e, i, j);

                        pixel-=pitch*8;
                        pixel+=sizeof(uintX)*2;

                        Read5(a,b,c,d,e);
                        texel++;

                        ScalePixel2x(f, g, a, b);
                        ScalePixel2x(g, h, b, c);
                        ScalePixel2x(h, i, c, d);
                        ScalePixel2x(i, j, d, e);

                        pixel-=pitch*8;
                        pixel+=sizeof(uintX)*2;

                } while (texel != tline_end);

                // Final X (clipping)
                if (clip_x) {
                        Read5(f,g,h,i,j);
                        texel++;

                        ScalePixel2x(a, b, f, g);
                        ScalePixel2x(b, c, g, h);
                        ScalePixel2x(c, d, h, i);
                        ScalePixel2x(d, e, i, j);

                        pixel-=pitch*8;
                        pixel+=sizeof(uintX)*2;

                        ScalePixel2x(f, g, f, g);
                        ScalePixel2x(g, h, g, h);
                        ScalePixel2x(h, i, h, i);
                        ScalePixel2x(i, j, i, j);

                        pixel-=pitch*8;
                        pixel+=sizeof(uintX)*2;
                };

                pixel  += p_diff;

                texel += tex_diff;
                tline_end += tpitch*4;
        } while (texel != tex_end);

        //
        // Final Rows - Clipping
        //

        // Src Loop Y
        if (clip_y) {
                Read5_Clipped(a,b,c,d,e);
                texel++;

                // Src Loop X
                do {
                        Read5_Clipped(f,g,h,i,j);
                        texel++;
                        ScalePixel2x(a, b, f, g);
                        ScalePixel2x(b, c, g, h);
                        ScalePixel2x(c, d, h, i);
                        ScalePixel2x(d, e, i, j);
                        pixel-=pitch*8;
                        pixel+=sizeof(uintX)*2;

                        Read5_Clipped(a,b,c,d,e);
                        texel++;
                        ScalePixel2x(f, g, a, b);
                        ScalePixel2x(g, h, b, c);
                        ScalePixel2x(h, i, c, d);
                        ScalePixel2x(i, j, d, e);
                        pixel-=pitch*8;
                        pixel+=sizeof(uintX)*2;
                } while (texel != tline_end);

                // Final X (clipping)
                if (clip_x) {
                        Read5_Clipped(f,g,h,i,j);
                        texel++;

                        ScalePixel2x(a, b, f, g);
                        ScalePixel2x(b, c, g, h);
                        ScalePixel2x(c, d, h, i);
                        ScalePixel2x(d, e, i, j);

                        pixel-=pitch*8;
                        pixel+=sizeof(uintX)*2;

                        ScalePixel2x(f, g, f, g);
                        ScalePixel2x(g, h, g, h);
                        ScalePixel2x(h, i, h, i);
                        ScalePixel2x(i, j, i, j);

                        pixel-=pitch*8;
                        pixel+=sizeof(uintX)*2;
                };

                pixel  += p_diff;

                texel += tex_diff;
                tline_end += tpitch*4;
        }

        return true;
}

InstantiateBilinearScalerFunc(BilinearScalerInternal_2x);

};

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