libavcodec/rectangle.h

   1 /*
   2  * rectangle filling function
   3  * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 /**
  23  * @file rectangle.h
  24  * useful rectangle filling function
  25  * @author Michael Niedermayer <michaelni@gmx.at>
  26  */
  27
  28 #ifndef AVCODEC_RECTANGLE_H
  29 #define AVCODEC_RECTANGLE_H
  30
  31 #include "libavutil/common.h"
  32
  33 /**
  34  * fill a rectangle.
  35  * @param h height of the rectangle, should be a constant
  36  * @param w width of the rectangle, should be a constant
  37  * @param size the size of val (1 or 4), should be a constant
  38  */
  39 static av_always_inline void fill_rectangle(void *vp, int w, int h, int stride, uint32_t val, int size){
  40     uint8_t *p= (uint8_t*)vp;
  41     assert(size==1 || size==4);
  42     assert(w<=4);
  43
  44     w      *= size;
  45     stride *= size;
  46
  47     assert((((long)vp)&(FFMIN(w, STRIDE_ALIGN)-1)) == 0);
  48     assert((stride&(w-1))==0);
  49     if(w==2){
  50         const uint16_t v= size==4 ? val : val*0x0101;
  51         *(uint16_t*)(p + 0*stride)= v;
  52         if(h==1) return;
  53         *(uint16_t*)(p + 1*stride)= v;
  54         if(h==2) return;
  55         *(uint16_t*)(p + 2*stride)= v;
  56         *(uint16_t*)(p + 3*stride)= v;
  57     }else if(w==4){
  58         const uint32_t v= size==4 ? val : val*0x01010101;
  59         *(uint32_t*)(p + 0*stride)= v;
  60         if(h==1) return;
  61         *(uint32_t*)(p + 1*stride)= v;
  62         if(h==2) return;
  63         *(uint32_t*)(p + 2*stride)= v;
  64         *(uint32_t*)(p + 3*stride)= v;
  65     }else if(w==8){
  66     //gcc can't optimize 64bit math on x86_32
  67 #ifdef HAVE_FAST_64BIT
  68         const uint64_t v= val*0x0100000001ULL;
  69         *(uint64_t*)(p + 0*stride)= v;
  70         if(h==1) return;
  71         *(uint64_t*)(p + 1*stride)= v;
  72         if(h==2) return;
  73         *(uint64_t*)(p + 2*stride)= v;
  74         *(uint64_t*)(p + 3*stride)= v;
  75     }else if(w==16){
  76         const uint64_t v= val*0x0100000001ULL;
  77         *(uint64_t*)(p + 0+0*stride)= v;
  78         *(uint64_t*)(p + 8+0*stride)= v;
  79         *(uint64_t*)(p + 0+1*stride)= v;
  80         *(uint64_t*)(p + 8+1*stride)= v;
  81         if(h==2) return;
  82         *(uint64_t*)(p + 0+2*stride)= v;
  83         *(uint64_t*)(p + 8+2*stride)= v;
  84         *(uint64_t*)(p + 0+3*stride)= v;
  85         *(uint64_t*)(p + 8+3*stride)= v;
  86 #else
  87         *(uint32_t*)(p + 0+0*stride)= val;
  88         *(uint32_t*)(p + 4+0*stride)= val;
  89         if(h==1) return;
  90         *(uint32_t*)(p + 0+1*stride)= val;
  91         *(uint32_t*)(p + 4+1*stride)= val;
  92         if(h==2) return;
  93         *(uint32_t*)(p + 0+2*stride)= val;
  94         *(uint32_t*)(p + 4+2*stride)= val;
  95         *(uint32_t*)(p + 0+3*stride)= val;
  96         *(uint32_t*)(p + 4+3*stride)= val;
  97     }else if(w==16){
  98         *(uint32_t*)(p + 0+0*stride)= val;
  99         *(uint32_t*)(p + 4+0*stride)= val;
 100         *(uint32_t*)(p + 8+0*stride)= val;
 101         *(uint32_t*)(p +12+0*stride)= val;
 102         *(uint32_t*)(p + 0+1*stride)= val;
 103         *(uint32_t*)(p + 4+1*stride)= val;
 104         *(uint32_t*)(p + 8+1*stride)= val;
 105         *(uint32_t*)(p +12+1*stride)= val;
 106         if(h==2) return;
 107         *(uint32_t*)(p + 0+2*stride)= val;
 108         *(uint32_t*)(p + 4+2*stride)= val;
 109         *(uint32_t*)(p + 8+2*stride)= val;
 110         *(uint32_t*)(p +12+2*stride)= val;
 111         *(uint32_t*)(p + 0+3*stride)= val;
 112         *(uint32_t*)(p + 4+3*stride)= val;
 113         *(uint32_t*)(p + 8+3*stride)= val;
 114         *(uint32_t*)(p +12+3*stride)= val;
 115 #endif
 116     }else
 117         assert(0);
 118     assert(h==4);
 119 }
 120
 121 #endif /* AVCODEC_RECTANGLE_H */