mmsfb_stretchblit_blend_airgb_to_airgb.cpp

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/***************************************************************************
 *   Copyright (C) 2005-2007 Stefan Schwarzer, Jens Schneider,             *
 *                           Matthias Hardt, Guido Madaus                  *
 *                                                                         *
 *   Copyright (C) 2007-2008 BerLinux Solutions GbR                        *
 *                           Stefan Schwarzer & Guido Madaus               *
 *                                                                         *
 *   Copyright (C) 2009-2013 BerLinux Solutions GmbH                       *
 *                                                                         *
 *   Authors:                                                              *
 *      Stefan Schwarzer   <stefan.schwarzer@diskohq.org>,                 *
 *      Matthias Hardt     <matthias.hardt@diskohq.org>,                   *
 *      Jens Schneider     <jens.schneider@diskohq.org>,                   *
 *      Guido Madaus       <guido.madaus@diskohq.org>,                     *
 *      Patrick Helterhoff <patrick.helterhoff@diskohq.org>,               *
 *      René Bählkow       <rene.baehlkow@diskohq.org>                     *
 *                                                                         *
 *   This library is free software; you can redistribute it and/or         *
 *   modify it under the terms of the GNU Lesser General Public            *
 *   License version 2.1 as published by the Free Software Foundation.     *
 *                                                                         *
 *   This library 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     *
 *   Lesser General Public License for more details.                       *
 *                                                                         *
 *   You should have received a copy of the GNU Lesser General Public      *
 *   License along with this library; if not, write to the                 *
 *   Free Software Foundation, Inc.,                                       *
 *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA            *
 **************************************************************************/

#include "mmsgui/fb/mmsfbconv.h"

#ifdef __HAVE_PF_AiRGB__

#include "mmstools/mmstools.h"

void mmsfb_stretchblit_blend_airgb_to_airgb(MMSFBExternalSurfaceBuffer *extbuf, int src_height, int sx, int sy, int sw, int sh,
                                            unsigned int *dst, int dst_pitch, int dst_height, int dx, int dy, int dw, int dh) {
    // first time?
    static bool firsttime = true;
    if (firsttime) {
        printf("DISKO: Using accelerated stretch & blend AiRGB to AiRGB.\n");
        firsttime = false;
    }

    // get the first source ptr/pitch
    unsigned int *src = (unsigned int *)extbuf->ptr;
    int src_pitch = extbuf->pitch;

    // prepare...
    int  src_pitch_pix = src_pitch >> 2;
    int  dst_pitch_pix = dst_pitch >> 2;
    unsigned int *src_end = src + sx + src_pitch_pix * (sy + sh);
    if (src_end > src + src_pitch_pix * src_height)
        src_end = src + src_pitch_pix * src_height;
    unsigned int *dst_end = dst + dst_pitch_pix * dst_height;
    src+=sx + sy * src_pitch_pix;
    dst+=dx + dy * dst_pitch_pix;


//  printf("sw=%d,sh=%d\n", sw,sh);

    int horifact = (dw<<16)/sw;
    int vertfact = (dh<<16)/sh;



    // for all lines
    int vertcnt = 0x8000;
    while ((src < src_end)&&(dst < dst_end)) {
        // for all pixels in the line
        vertcnt+=vertfact;
        if (vertcnt & 0xffff0000) {
            unsigned int *line_end = src + sw;
            unsigned int *old_dst = dst;

            do {
                int horicnt = 0x8000;
                while (src < line_end) {
                    // load pixel from memory and check if the previous pixel is the same

                    horicnt+=horifact;

                    if (horicnt & 0xffff0000) {
                        register unsigned int SRC  = *src;
                        register unsigned int A = SRC >> 24;

                        if (!A) {
                            // source pixel is not transparent, copy it directly to the destination
                            do {
                                *dst = SRC;
                                dst++;
                                horicnt-=0x10000;
                            } while (horicnt & 0xffff0000);
                        }
                        else
                        if (A == 0xff) {
                            // source pixel is full transparent, do not change the destination
                            do {
                                dst++;
                                horicnt-=0x10000;
                            } while (horicnt & 0xffff0000);
                        }
                        else
                        {
                            // source alpha is > 0x00 and < 0xff
                            register unsigned int DST = *dst;
                            unsigned int OLDDST = DST + 1;
                            register unsigned int d;

                            do {
                                if (DST==OLDDST) {
                                    // same pixel, use the previous value
                                    if (A < 0xff) {
                                        // source has an alpha
                                        *dst = d;
                                    }
                                    dst++;
                                    DST = *dst;
                                    horicnt-=0x10000;
                                    continue;
                                }
                                OLDDST = DST;

                                // extract destination
                                unsigned int a = DST >> 24;
                                unsigned int r = (DST << 8) >> 24;
                                unsigned int g = (DST << 16) >> 24;
                                unsigned int b = DST & 0xff;

                                // invert src alpha
                                a = (A * (0x100 - a)) >> 8;
                                r = (A * r) >> 8;
                                g = (A * g) >> 8;
                                b = (A * b) >> 8;

                                // add src to dst
                                a += 0x100 - A;
                                r += (SRC << 8) >> 24;
                                g += (SRC << 16) >> 24;
                                b += SRC & 0xff;
                                d =   ((r >> 8) ? 0xff0000   : (r << 16))
                                    | ((g >> 8) ? 0xff00     : (g << 8))
                                    | ((b >> 8) ? 0xff       :  b);
                                if (!(a >> 8)) d |= (0x100 - a) << 24;
                                *dst = d;
                                dst++;
                                DST = *dst;
                                horicnt-=0x10000;
                            } while (horicnt & 0xffff0000);
                        }
                    }

                    src++;
                }
                src-=sw;
                vertcnt-=0x10000;
                dst = old_dst +  dst_pitch/4;
                old_dst = dst;
            } while (vertcnt & 0xffff0000);
        }

        // next line
        src+=src_pitch/4;
    }
}

#endif

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