bmp.c

编译后直接运行的ＭＰ３播放器全部Ｃ语言源代码 一个包含FAT文件系统、系统引导 Boot、FLASH Driver等内容的

/***************************************************************************
 *             __________               __   ___.
 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
 *                     \/            \/     \/    \/            \/
 * $Id: bmp.c,v 1.8 2002/08/16 14:07:43 bagder Exp $
 *
 * Copyright (C) 2002 by Linus Nielsen Feltzing
 *
 * All files in this archive are subject to the GNU General Public License.
 * See the file COPYING in the source tree root for full license agreement.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 ****************************************************************************/
/*********************************************************************
 *
 * Converts BMP files to Rockbox bitmap format
 *
 * 1999-05-03 Linus Nielsen Feltzing
 *
 **********************************************/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include "debug.h"

#include "file.h"

#if 0

#ifdef __GNUC__
#define STRUCT_PACKED __attribute__((packed))
#else
#define STRUCT_PACKED
#pragma pack (push, 2)
#endif

struct Fileheader
{
  unsigned short Type;          /* signature - 'BM' */
  unsigned  long Size;          /* file size in bytes */
  unsigned short Reserved1;     /* 0 */
  unsigned short Reserved2;     /* 0 */
  unsigned long  OffBits;       /* offset to bitmap */
  unsigned long  StructSize;    /* size of this struct (40) */
  unsigned long  Width;         /* bmap width in pixels */
  unsigned long  Height;        /* bmap height in pixels */
  unsigned short Planes;        /* num planes - always 1 */
  unsigned short BitCount;      /* bits per pixel */
  unsigned long  Compression;   /* compression flag */
  unsigned long  SizeImage;     /* image size in bytes */
  long           XPelsPerMeter; /* horz resolution */
  long           YPelsPerMeter; /* vert resolution */
  unsigned long  ClrUsed;       /* 0 -> color table size */
  unsigned long  ClrImportant;  /* important color count */
} STRUCT_PACKED;

struct RGBQUAD
{
  unsigned char rgbBlue;
  unsigned char rgbGreen;
  unsigned char rgbRed;
  unsigned char rgbReserved;
} STRUCT_PACKED;

#ifdef LITTLE_ENDIAN
#define readshort(x) x
#define readlong(x) x
#else

#define readshort(x) (((x&0xff00)>>8)|((x&0x00ff)<<8))
#define readlong(x) (((x&0xff000000)>>24)| \
                     ((x&0x00ff0000)>>8) | \
                     ((x&0x0000ff00)<<8) | \
                     ((x&0x000000ff)<<24))
#endif

/*********************************************************************
 * read_bmp_file()
 *
 * Reads a 8bit BMP file and puts the data in a 1-pixel-per-byte
 * array. Returns 0 on success.
 *
 **********************************************/
int read_bmp_file(char* filename,
                  int *get_width,  /* in pixels */
                  int *get_height, /* in pixels */
                  char *bitmap)
{
   struct Fileheader fh;
   struct RGBQUAD palette[2]; /* two colors only */

   unsigned int bitmap_width, bitmap_height;

   long PaddedWidth;
   int background;
   int fd = open(filename, O_RDONLY);
   long size;
   unsigned int row, col;
   int l;
   unsigned char *bmp;
   int width;

   if(fd == -1)
   {
      debugf("error - can't open '%s'\n", filename);
      return 1;
   }
   else
   {
     if(read(fd, &fh, sizeof(struct Fileheader)) !=
        sizeof(struct Fileheader))
      {
	debugf("error - can't Read Fileheader Stucture\n");
        close(fd);
        return 2;
      }

      /* Exit if not monochrome */
      if(readshort(fh.BitCount) > 8)
      {
	debugf("error - Bitmap must be less than 8, got %d\n",
               readshort(fh.BitCount));
        close(fd);
        return 2;
      }

      /* Exit if too wide */
      if(readlong(fh.Width) > 112)
      {
	debugf("error - Bitmap is too wide (%d pixels, max is 112)\n",
               readlong(fh.Width));
        close(fd);
        return 3;
      }
      debugf("Bitmap is %d pixels wide\n", readlong(fh.Width));

      /* Exit if too high */
      if(readlong(fh.Height) > 64)
      {
	debugf("error - Bitmap is too high (%d pixels, max is 64)\n",
               readlong(fh.Height));
        close(fd);
	return 4;
      }
      debugf("Bitmap is %d pixels heigh\n", readlong(fh.Height));

      for(l=0;l < 2;l++)
      {
	if(read(fd, &palette[l],sizeof(struct RGBQUAD)) !=
           sizeof(struct RGBQUAD))
	{
          debugf("error - Can't read bitmap's color palette\n");
          close(fd);
          return 5;
	}
      }
      /* pass the other palettes */
      lseek(fd, 254*sizeof(struct RGBQUAD), SEEK_CUR);

      /* Try to guess the foreground and background colors.
         We assume that the foreground color is the darkest. */
      if(((int)palette[0].rgbRed +
          (int)palette[0].rgbGreen +
          (int)palette[0].rgbBlue) >
          ((int)palette[1].rgbRed +
          (int)palette[1].rgbGreen +
          (int)palette[1].rgbBlue))
      {
         background = 0;
      }
      else
      {
         background = 1;
      }

      /*  width = readlong(fh.Width)*readshort(fh.BitCount); */

      width = readlong(fh.Width);

      /* PaddedWidth = ((width+31)&(~0x1f))/8; */
      PaddedWidth = ((width+3)&(~0x3));
      size = PaddedWidth*readlong(fh.Height);

      bmp = (unsigned char *)malloc(size);

      if(bmp == NULL)
      {
          debugf("error - Out of memory\n");
          close(fd);
          return 6;
      }
      else
      {
          if(read(fd, (unsigned char*)bmp,(long)size) != size) {
              debugf("error - Can't read image\n");
              close(fd);
              return 7;
          }
      }

      bitmap_height = readlong(fh.Height);
      bitmap_width = readlong(fh.Width);

      *get_width = bitmap_width;
      *get_height = bitmap_height;

      /* Now convert the bitmap into an array with 1 byte per pixel,
         exactly the size of the image */

      for(row = 0;row < bitmap_height;row++) {
	for(col = 0;col < bitmap_width;col++) {
          if(bmp[(bitmap_height-1 -row) * PaddedWidth + col]) {
            bitmap[ (row/8) * bitmap_width + col ] &= ~ (1<<(row&7));
          }
          else {
            bitmap[ (row/8) * bitmap_width + col ] |= 1<<(row&7);
          }
	}
      }

      free(bmp);

   }
   close(fd);
   return 0; /* success */
}

#endif /* 0 */