apps/plugins/lib/pluginlib_bmp.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2006 by Antoine Cellerier <dionoea -at- videolan -dot- org>
  11  * Copyright (C) 2009 by Andrew Mahone
  12  *
  13  * This program is free software; you can redistribute it and/or
  14  * modify it under the terms of the GNU General Public License
  15  * as published by the Free Software Foundation; either version 2
  16  * of the License, or (at your option) any later version.
  17  *
  18  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  19  * KIND, either express or implied.
  20  *
  21  ****************************************************************************/
  22
  23 #include "pluginlib_bmp.h"
  24
  25 #include "lcd.h"
  26 #include "file.h"
  27 #include "system.h"
  28
  29 #if LCD_DEPTH > 1  /* save is only available for color, resize for >1bpp */
  30 #ifdef HAVE_LCD_COLOR
  31 #define LE16(x) (htole16(x))&0xff, ((htole16(x))>>8)&0xff
  32 #define LE32(x) (htole32(x))&0xff, ((htole32(x))>>8)&0xff, ((htole32(x))>>16)&0xff, ((htole32(x))>>24)&0xff
  33 /**
  34  * Save to 24 bit bitmap.
  35  */
  36 int save_bmp_file( char* filename, struct bitmap *bm )
  37 {
  38     int line_width = (bm->width*3+3) & ~3;
  39     int padsize = line_width - bm->width*3;
  40
  41     const unsigned char header[] =
  42     {
  43         0x42, 0x4d, /* signature - 'BM' */
  44         LE32( bm->height*line_width + 54 + 4*0 ), /* file size in bytes */
  45         0x00, 0x00, 0x00, 0x00, /* 0, 0 */
  46         LE32( 54 + 4*0 ), /* offset to bitmap */
  47         0x28, 0x00, 0x00, 0x00, /* size of this struct (40) */
  48         LE32( bm->width ), /* bmap width in pixels */
  49         LE32( bm->height ), /* bmap height in pixels */
  50         0x01, 0x00, /* num planes - always 1 */
  51         LE16( 24 ), /* bits per pixel */
  52         LE32( 0 ), /* compression flag */
  53         LE32( bm->height*line_width ), /* image size in bytes */
  54         0xc4, 0x0e, 0x00, 0x00, /* horz resolution */
  55         0xc4, 0x0e, 0x00, 0x00, /* vert resolution */
  56         LE32( 0 ), /* 0 -> color table size */
  57         LE32( 0 ) /* important color count */
  58     };
  59
  60     int fh;
  61     int x,y;
  62     if( bm->format != FORMAT_NATIVE ) return -1;
  63     fh = rb->creat( filename , 0666);
  64     if( fh < 0 ) return -1;
  65
  66     rb->write( fh, header, sizeof( header ) );
  67     for( y = bm->height-1; y >= 0; y-- )
  68     {
  69         for( x = 0; x <  bm->width; x++ )
  70         {
  71             fb_data *d = (fb_data*)( bm->data ) + (x+y*bm->width);
  72             unsigned char c[] =
  73             {
  74                 RGB_UNPACK_BLUE( *d ),
  75                 RGB_UNPACK_GREEN( *d ),
  76                 RGB_UNPACK_RED( *d )
  77             };
  78             rb->write( fh, c, 3 );
  79         }
  80         if(padsize != 0)
  81         {
  82             unsigned int c = 0; /* padsize is at most 3. */
  83             rb->write( fh, &c, padsize );
  84         }
  85     }
  86     rb->close( fh );
  87     return 1;
  88 }
  89 #endif
  90
  91 /**
  92    Very simple image scale from src to dst (nearest neighbour).
  93    Source and destination dimensions are read from the struct bitmap.
  94 */
  95 void simple_resize_bitmap(struct bitmap *src, struct bitmap *dst)
  96 {
  97     const int srcw = src->width;
  98     const int srch = src->height;
  99     const int dstw = dst->width;
 100     const int dsth = dst->height;
 101     const fb_data *srcd = (fb_data*)(src->data);
 102     const fb_data *dstd = (fb_data*)(dst->data);
 103
 104     const long xrstep = ((srcw-1) << 8) / (dstw-1);
 105     const long yrstep = ((srch-1) << 8) / (dsth-1);
 106     fb_data *src_row, *dst_row;
 107     long xr, yr = 0;
 108     int src_x, src_y, dst_x, dst_y;
 109     for (dst_y=0; dst_y < dsth; dst_y++)
 110     {
 111         src_y = (yr >> 8);
 112         src_row = (fb_data*)&srcd[src_y * srcw];
 113         dst_row = (fb_data*)&dstd[dst_y * dstw];
 114         for (xr=0,dst_x=0; dst_x < dstw; dst_x++)
 115         {
 116             src_x = (xr >> 8);
 117             dst_row[dst_x] = src_row[src_x];
 118             xr += xrstep;
 119         }
 120         yr += yrstep;
 121     }
 122 }
 123
 124 #endif /* LCD_DEPTH > 1 */
 125
 126 #include "wrappers.h"
 127
 128 /* import the core bmp loader */
 129 #include "recorder/bmp.c"