mmsfb_blit_blend_coloralpha_ayuv_to_ayuv.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) 2009-2012 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_AYUV__

#include "mmstools/mmstools.h"

void mmsfb_blit_blend_coloralpha_ayuv_to_ayuv(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,
                                              unsigned char alpha) {
    // check for full alpha value
    if (alpha == 0xff) {
        // max alpha is specified, so i can ignore it and use faster routine
        mmsfb_blit_blend_ayuv_to_ayuv(extbuf, src_height, sx, sy, sw, sh,
                                      dst, dst_pitch, dst_height, dx, dy);
        return;
    }

    // first time?
    static bool firsttime = true;
    if (firsttime) {
        printf("DISKO: Using accelerated blend coloralpha AYUV to AYUV.\n");
        firsttime = false;
    }

    // something to do?
    if (!alpha)
        // source should blitted full transparent, so leave destination as is
        return;

    // 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;
    src+= sx + sy * src_pitch_pix;
    dst+= dx + dy * dst_pitch_pix;

    // check the surface range
    if (dst_pitch_pix - dx < sw - sx)
        sw = dst_pitch_pix - dx - sx;
    if (dst_height - dy < sh - sy)
        sh = dst_height - dy - sy;
    if ((sw <= 0)||(sh <= 0))
        return;

    unsigned int OLDDST = (*dst) + 1;
    unsigned int OLDSRC  = (*src) + 1;
    unsigned int *src_end = src + src_pitch_pix * sh;
    int src_pitch_diff = src_pitch_pix - sw;
    int dst_pitch_diff = dst_pitch_pix - sw;
    register unsigned int d;

    register int ALPHA = alpha;
    ALPHA++;

    // for all lines
    while (src < src_end) {
        // for all pixels in the line
        unsigned int *line_end = src + sw;
        while (src < line_end) {
            // load pixel from memory and check if the previous pixel is the same
            register unsigned int SRC = *src;

            // is the source alpha channel 0x00 or 0xff?
            register unsigned int A = SRC >> 24;
            if (A) {
                // source alpha is > 0x00 and < 0xff
                register unsigned int DST = *dst;

                if ((DST==OLDDST)&&(SRC==OLDSRC)) {
                    // same pixel, use the previous value
                    *dst = d;
                    dst++;
                    src++;
                    continue;
                }
                OLDDST = DST;
                OLDSRC = SRC;

                // load source pixel
                A = (ALPHA * A) >> 8;
                int sy = (SRC << 8) >> 24;
                int su = (SRC << 16) >> 24;
                int sv = SRC & 0xff;
                //register int SA= 0x100 - A;

                // multiply source with given ALPHA
                // we have to move the 0 point of the coordinate system
                // this make it a little slower than ARGB to ARGB blending
                MMSFB_CONV_PREPARE_YUVBLEND(sy,su,sv);
                sy = (ALPHA * sy) >> 8;
                su = (ALPHA * su) >> 8;
                sv = (ALPHA * sv) >> 8;
                MMSFB_CONV_RESET_YUVBLEND(sy,su,sv);

                // extract destination
                unsigned int a = DST >> 24;
                int y = (DST << 8) >> 24;
                int u = (DST << 16) >> 24;
                int v = DST & 0xff;

                // we have to move the 0 point of the coordinate system
                // this make it a little slower than ARGB to ARGB blending
                MMSFB_CONV_PREPARE_YUVBLEND(y,u,v);

                // add src to dst
                a += A;
                y += sy;
                u += su;
                v += sv;

                // build destination pixel, have to check for negative values
                // this make it a little slower than ARGB to ARGB blending
                d = ((a >> 8) ? 0xff000000 : (a << 24));
                if (y > 0)
                    d |= ((y >> 8) ? 0xff0000 : (y << 16));
                if (u > 0)
                    d |= ((u >> 8) ? 0xff00 : (u << 8));
                if (v > 0)
                    d |= ((v >> 8) ? 0xff : v);

                *dst = d;
            }

            dst++;
            src++;
        }

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

#endif

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