Logo
  • Main Page
  • Related Pages
  • Modules
  • Classes
  • Files

mmsfb_blit_blend_argb_to_airgb.cpp

Go to the documentation of this file.
00001 /***************************************************************************
00002  *   Copyright (C) 2005-2007 Stefan Schwarzer, Jens Schneider,             *
00003  *                           Matthias Hardt, Guido Madaus                  *
00004  *                                                                         *
00005  *   Copyright (C) 2007-2008 BerLinux Solutions GbR                        *
00006  *                           Stefan Schwarzer & Guido Madaus               *
00007  *                                                                         *
00008  *   Copyright (C) 2009-2013 BerLinux Solutions GmbH                       *
00009  *                                                                         *
00010  *   Authors:                                                              *
00011  *      Stefan Schwarzer   <stefan.schwarzer@diskohq.org>,                 *
00012  *      Matthias Hardt     <matthias.hardt@diskohq.org>,                   *
00013  *      Jens Schneider     <jens.schneider@diskohq.org>,                   *
00014  *      Guido Madaus       <guido.madaus@diskohq.org>,                     *
00015  *      Patrick Helterhoff <patrick.helterhoff@diskohq.org>,               *
00016  *      René Bählkow       <rene.baehlkow@diskohq.org>                     *
00017  *                                                                         *
00018  *   This library is free software; you can redistribute it and/or         *
00019  *   modify it under the terms of the GNU Lesser General Public            *
00020  *   License version 2.1 as published by the Free Software Foundation.     *
00021  *                                                                         *
00022  *   This library is distributed in the hope that it will be useful,       *
00023  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
00024  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU     *
00025  *   Lesser General Public License for more details.                       *
00026  *                                                                         *
00027  *   You should have received a copy of the GNU Lesser General Public      *
00028  *   License along with this library; if not, write to the                 *
00029  *   Free Software Foundation, Inc.,                                       *
00030  *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA            *
00031  **************************************************************************/
00032 
00033 #include "mmsgui/fb/mmsfbconv.h"
00034 
00035 #ifdef __HAVE_PF_ARGB__
00036 #ifdef __HAVE_PF_AiRGB__
00037 
00038 #include "mmstools/mmstools.h"
00039 
00040 void mmsfb_blit_blend_argb_to_airgb(MMSFBExternalSurfaceBuffer *extbuf, int src_height, int sx, int sy, int sw, int sh,
00041                                     unsigned int *dst, int dst_pitch, int dst_height, int dx, int dy) {
00042     // first time?
00043     static bool firsttime = true;
00044     if (firsttime) {
00045         printf("DISKO: Using accelerated blend ARGB to AiRGB.\n");
00046         firsttime = false;
00047     }
00048 
00049     // get the first source ptr/pitch
00050     unsigned int *src = (unsigned int *)extbuf->ptr;
00051     int src_pitch = extbuf->pitch;
00052 
00053     // prepare...
00054     int src_pitch_pix = src_pitch >> 2;
00055     int dst_pitch_pix = dst_pitch >> 2;
00056     src+= sx + sy * src_pitch_pix;
00057     dst+= dx + dy * dst_pitch_pix;
00058 
00059     // check the surface range
00060     if (dst_pitch_pix - dx < sw - sx)
00061         sw = dst_pitch_pix - dx - sx;
00062     if (dst_height - dy < sh - sy)
00063         sh = dst_height - dy - sy;
00064     if ((sw <= 0)||(sh <= 0))
00065         return;
00066 
00067     unsigned int OLDDST = (*dst) + 1;
00068     unsigned int OLDSRC  = (*src) + 1;
00069     unsigned int *src_end = src + src_pitch_pix * sh;
00070     int src_pitch_diff = src_pitch_pix - sw;
00071     int dst_pitch_diff = dst_pitch_pix - sw;
00072     register unsigned int d;
00073 
00074     // for all lines
00075     while (src < src_end) {
00076         // for all pixels in the line
00077         unsigned int *line_end = src + sw;
00078         while (src < line_end) {
00079             // load pixel from memory and check if the previous pixel is the same
00080             register unsigned int SRC = *src;
00081 
00082             // is the source alpha channel 0x00 or 0xff?
00083             register unsigned int A = SRC >> 24;
00084             if (A == 0xff) {
00085                 // source pixel is not transparent, copy it directly to the destination
00086                 *dst = SRC & 0x00ffffff;
00087             }
00088             else
00089             if (A) {
00090                 // source alpha is > 0x00 and < 0xff
00091                 register unsigned int DST = *dst;
00092 
00093                 if ((DST==OLDDST)&&(SRC==OLDSRC)) {
00094                     // same pixel, use the previous value
00095                     *dst = d;
00096                     dst++;
00097                     src++;
00098                     continue;
00099                 }
00100                 OLDDST = DST;
00101                 OLDSRC = SRC;
00102 
00103                 register unsigned int SA= 0x100 - A;
00104                 unsigned int a = DST >> 24;
00105                 unsigned int r = (DST << 8) >> 24;
00106                 unsigned int g = (DST << 16) >> 24;
00107                 unsigned int b = DST & 0xff;
00108 
00109                 // invert src alpha
00110                 a = (SA * (0x100 - a)) >> 8;
00111                 r = (SA * r) >> 8;
00112                 g = (SA * g) >> 8;
00113                 b = (SA * b) >> 8;
00114 
00115                 // add src to dst
00116                 a += A;
00117                 r += (SRC << 8) >> 24;
00118                 g += (SRC << 16) >> 24;
00119                 b += SRC & 0xff;
00120                 d =   ((r >> 8) ? 0xff0000   : (r << 16))
00121                     | ((g >> 8) ? 0xff00     : (g << 8))
00122                     | ((b >> 8) ? 0xff       :  b);
00123                 if (!(a >> 8)) d |= (0x100 - a) << 24;
00124                 *dst = d;
00125             }
00126 
00127             dst++;
00128             src++;
00129         }
00130 
00131         // go to the next line
00132         src+= src_pitch_diff;
00133         dst+= dst_pitch_diff;
00134     }
00135 }
00136 
00137 #endif
00138 #endif

Generated by doxygen