mmsfb_fillrectangle_blend_argb4444.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_ARGB4444__

#include "mmstools/mmstools.h"

void mmsfb_fillrectangle_blend_argb4444(MMSFBSurfacePlanes *dst_planes, int dst_height,
                                        int dx, int dy, int dw, int dh, MMSFBColor color) {
    // first time?
    static bool firsttime = true;
    if (firsttime) {
        printf("DISKO: Using accelerated blend rectangle to ARGB4444.\n");
        firsttime = false;
    }

    // return immediately if alpha channel of the color is 0x00
    if (!color.a)
        return;

    // get the first destination ptr/pitch
    unsigned short int *dst = (unsigned short int *)dst_planes->ptr;
    int dst_pitch = dst_planes->pitch;

    // prepare...
    int dst_pitch_pix = dst_pitch >> 1;
    dst+= dx + dy * dst_pitch_pix;

    unsigned short int OLDDST = (*dst) + 1;
    unsigned short int *dst_end = dst + dst_pitch_pix * dh;
    int dst_pitch_diff = dst_pitch_pix - dw;
    register unsigned short int d;

    // prepare the color
    register unsigned short int A = color.a;
    register unsigned short int SRC;
    SRC =     ((A >> 4) << 12)
            | ((color.r >> 4) << 8)
            | ((color.g >> 4) << 4)
            |  (color.b >> 4);

    if (color.a == 0xff) {
        // source pixel is not transparent, copy it directly to the destination
        // for all lines
        while (dst < dst_end) {
            // for all pixels in the line
#ifdef __HAVE_SSE__
            // fill memory 2-byte-wise (much faster than loop see below)
//          __asm__ __volatile__ ( "\trep stosw\n" : : "D" (dst), "a" (SRC), "c" (dw));
            short d0, d1, d2;
            __asm__ __volatile__ ( "\tcld\n\trep stosw" \
                    : "=&D" (d0), "=&a" (d1), "=&c" (d2) \
                    : "0" (dst), "1" (SRC), "2" (dw) \
                    : "memory", "cc");

            // go to the next line
            dst+= dst_pitch_pix;
#else
            unsigned short int *line_end = dst + dw;
            while (dst < line_end) {
                *dst = SRC;
                dst++;
            }

            // go to the next line
            dst+= dst_pitch_diff;
#endif
        }

    }
    else {
        // source alpha is > 0x00 and < 0xff
        // for all lines
        while (dst < dst_end) {
            // for all pixels in the line
            unsigned short int *line_end = dst + dw;
            while (dst < line_end) {
                // read the destination
                register unsigned short int DST = *dst;
                if (DST==OLDDST) {
                    // same pixel, use the previous value
                    *dst = d;
                    dst++;
                    continue;
                }
                OLDDST = DST;

                register int SA= 0x100 - A;
                unsigned int a = DST >> 12;
                unsigned int r = DST & 0x0f00;
                unsigned int g = DST & 0x00f0;
                unsigned int b = DST & 0x000f;

                // invert src alpha
                a = (SA * a) >> 4;
                r = (SA * r) >> 12;
                g = (SA * g) >> 8;
                b = (SA * b) >> 4;

                // add src to dst
                a += A;
                r += (SRC & 0x0f00) >> 4;
                g +=  SRC & 0x00f0;
                b += (SRC & 0x000f) << 4;
                d =   ((a >> 8) ? 0xf000 : ((a >> 4) << 12))
                    | ((r >> 8) ? 0x0f00 : ((r >> 4) << 8))
                    | ((g >> 8) ? 0xf0   : ((g >> 4) << 4))
                    | ((b >> 8) ? 0x0f   :  (b >> 4));
                *dst = d;

                dst++;
            }

            // go to the next line
            dst+= dst_pitch_diff;
        }
    }
}

#endif

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