src/base/bitmap.cc

   1 /*
   2  * Copyright (c) 2010 ARM Limited
   3  * All rights reserved
   4  *
   5  * The license below extends only to copyright in the software and shall
   6  * not be construed as granting a license to any other intellectual
   7  * property including but not limited to intellectual property relating
   8  * to a hardware implementation of the functionality of the software
   9  * licensed hereunder.  You may use the software subject to the license
  10  * terms below provided that you ensure that this notice is replicated
  11  * unmodified and in its entirety in all distributions of the software,
  12  * modified or unmodified, in source code or in binary form.
  13  *
  14  * Redistribution and use in source and binary forms, with or without
  15  * modification, are permitted provided that the following conditions are
  16  * met: redistributions of source code must retain the above copyright
  17  * notice, this list of conditions and the following disclaimer;
  18  * redistributions in binary form must reproduce the above copyright
  19  * notice, this list of conditions and the following disclaimer in the
  20  * documentation and/or other materials provided with the distribution;
  21  * neither the name of the copyright holders nor the names of its
  22  * contributors may be used to endorse or promote products derived from
  23  * this software without specific prior written permission.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  26  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  27  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  28  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  29  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  30  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  31  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  32  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  33  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  34  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  35  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  *
  37  * Authors: William Wang
  38  *          Ali Saidi
  39  *          Chris Emmons
  40  */
  41
  42 #include <cassert>
  43
  44 #include "base/bitmap.hh"
  45 #include "base/misc.hh"
  46
  47 const size_t Bitmap::sizeofHeaderBuffer = sizeof(Magic) + sizeof(Header) +
  48                                         sizeof(Info);
  49
  50 // bitmap class ctor
  51 Bitmap::Bitmap(VideoConvert::Mode _mode, uint16_t w, uint16_t h, uint8_t *d)
  52     : mode(_mode), height(h), width(w), data(d),
  53     vc(mode, VideoConvert::rgb8888, width, height), headerBuffer(0)
  54 {
  55 }
  56
  57 Bitmap::~Bitmap() {
  58     if (headerBuffer)
  59         delete [] headerBuffer;
  60 }
  61
  62 void
  63 Bitmap::write(std::ostream *bmp) const
  64 {
  65     assert(data);
  66
  67     // header is always the same for a bitmap object; compute the info once per
  68     //   bitmap object
  69     if (!headerBuffer) {
  70         // For further information see:
  71         //   http://en.wikipedia.org/wiki/BMP_file_format
  72         Magic magic = {{'B','M'}};
  73         Header header = {sizeof(VideoConvert::Rgb8888) * width * height,
  74                                 0, 0, 54};
  75         Info info = {sizeof(Info), width, height, 1,
  76                     sizeof(VideoConvert::Rgb8888) * 8, 0,
  77                     sizeof(VideoConvert::Rgb8888) * width * height, 1, 1, 0, 0};
  78
  79         char *p = headerBuffer = new char[sizeofHeaderBuffer];
  80         memcpy(p, &magic, sizeof(Magic));
  81         p += sizeof(Magic);
  82         memcpy(p, &header, sizeof(Header));
  83         p += sizeof(Header);
  84         memcpy(p, &info,   sizeof(Info));
  85     }
  86
  87     // 1.  write the header
  88     bmp->write(headerBuffer, sizeofHeaderBuffer);
  89
  90     // 2.  write the bitmap data
  91     uint8_t *tmp = vc.convert(data);
  92     uint32_t *tmp32 = (uint32_t*)tmp;
  93
  94     // BMP start store data left to right starting with the bottom row
  95     // so we need to do some creative flipping
  96     for (int i = height - 1; i >= 0; i--)
  97         for (int j = 0; j < width; j++)
  98             bmp->write((char*)&tmp32[i * width + j], sizeof(uint32_t));
  99
 100     bmp->flush();
 101
 102     delete [] tmp;
 103 }
 104