443 lines
10 KiB
C++
443 lines
10 KiB
C++
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//
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// bmp.cpp - source file / freeware
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//
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// David Henry - tfc_duke@hotmail.com
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//
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#include "bmp.h"
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#include <stdio.h>
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#include <libc/stubs.h>
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extern "C"{
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long filelength(int fhandle);
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}
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// --------------------------------------------------
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// LoadFileBMP() - load a Windows/OS2 BITMAP image
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// [.bmp].
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//
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// parameters :
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// - filename [in] : image source file
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// - pixels [out] : 32 bits rgb image data
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// - width [out] : image width in pixels
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// - height [out] : image height in pixels
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// - flipvert [in] : flip vertically
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//
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// return value :
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// - -1 : no image data
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// - 0 : failure
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// - 1 : success
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//
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// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// accepted image formats :
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// # RGB 1-4-8-24-32 bits WINDOWS - OS/2
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// # RLE 4-8 bits WINDOWS
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// --------------------------------------------------
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int LoadFileBMP( const char *filename, unsigned char **pixels, int *width, int *height, bool flipvert )
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{
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FILE *file; // file stream
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BITMAPFILEHEADER *bmfh; // bitmap file header
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BITMAPINFOHEADER *bmih; // bitmap info header (windows)
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BITMAPCOREHEADER *bmch; // bitmap core header (os/2)
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RGBTRIPLE *os2_palette; // pointer to the color palette os/2
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RGBQUAD *win_palette; // pointer to the color palette windows
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char *buffer; // buffer storing the entire file
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unsigned char *ptr; // pointer to pixels data
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int bitCount; // number of bits per pixel
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int compression; // compression type (rgb/rle)
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int row, col, i; // temporary variables
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int w, h; // width, height
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/////////////////////////////////////////////////////
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// read the entire file in the buffer
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file = fopen(filename,"rb");
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if( !file)
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return 0;
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long flen = filelength(fileno(file));
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buffer = new char[ flen + 1 ];
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int rd = fread(buffer, flen, 1, file);
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char *pBuff = buffer;
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fclose(file);
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/////////////////////////////////////////////////////
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// read the header
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bmfh = (BITMAPFILEHEADER *)pBuff;
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pBuff += sizeof( BITMAPFILEHEADER );
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// verify that it's a BITMAP file
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if( bmfh->bfType != BITMAP_ID )
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{
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delete [] buffer;
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return 0;
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}
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bmch = (BITMAPCOREHEADER *)pBuff;
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bmih = (BITMAPINFOHEADER *)pBuff;
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if( (bmih->biCompression < 0) || (bmih->biCompression > 3) )
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{
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// OS/2 style
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pBuff += sizeof( BITMAPCOREHEADER );
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bitCount = bmch->bcBitCount;
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compression = BI_OS2;
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w = bmch->bcWidth;
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h = bmch->bcHeight;
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}
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else
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{
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// WINDOWS style
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pBuff += sizeof( BITMAPINFOHEADER );
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bitCount = bmih->biBitCount;
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compression = bmih->biCompression;
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w = bmih->biWidth;
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h = bmih->biHeight;
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}
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if( width )
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*width = w;
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if( height )
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*height = h;
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if( !pixels )
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{
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delete [] buffer;
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return (-1);
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}
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/////////////////////////////////////////////////////
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// read the palette
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if( bitCount <= 8 )
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{
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// 24 and 32 bits images are not paletted
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// ajust the palette pointer to the memory in the buffer
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os2_palette = (RGBTRIPLE *)pBuff;
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win_palette = (RGBQUAD *)pBuff;
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// [number of colors in the palette] * [size of one pixel]
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pBuff += (1 << bitCount) * (bitCount >> 3) * sizeof( unsigned char );
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}
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/////////////////////////////////////////////////////
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// allocate memory to store pixel data
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*pixels = new unsigned char[ w * h * 3 ];
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ptr = &(*pixels)[0];
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// move the pixel data pointer to the begening of bitmap data
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pBuff = buffer + (bmfh->bfOffBits * sizeof( char ));
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/////////////////////////////////////////////////////
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// read pixel data following the image compression
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// type and the number of bits per pixels
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/////////////////////////////////////////////////////
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switch( compression )
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{
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case BI_OS2:
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case BI_RGB:
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{
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for( row = h - 1; row >= 0; row-- )
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{
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if( flipvert )
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ptr = &(*pixels)[ row * w * 3 ];
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switch( bitCount )
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{
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case 1:
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{
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// RGB 1 BITS
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for( col = 0; col < (int)(w / 8); col++ )
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{
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// read the current pixel
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unsigned char color = *((unsigned char *)(pBuff++));
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for( i = 7; i >= 0; i--, ptr += 3 )
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{
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// convert indexed pixel (1 bit) into rgb (32 bits) pixel
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int clrIdx = ((color & (1<<i)) > 0);
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if( compression == BI_OS2 )
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{
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ptr[2] = os2_palette[ clrIdx ].rgbtRed;
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ptr[1] = os2_palette[ clrIdx ].rgbtGreen;
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ptr[0] = os2_palette[ clrIdx ].rgbtBlue;
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}
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else
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{
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ptr[2] = win_palette[ clrIdx ].rgbRed;
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ptr[1] = win_palette[ clrIdx ].rgbGreen;
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ptr[0] = win_palette[ clrIdx ].rgbBlue;
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}
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}
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}
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break;
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}
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case 4:
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{
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// RGB 4 BITS
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for( col = 0; col < (int)(w / 2); col++, ptr += 6 )
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{
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// read the current pixel
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unsigned char color = *((unsigned char *)(pBuff++));
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// convert indexed pixel (4 bits) into rgb (32 bits) pixel
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int clrIdx;
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if( compression == BI_OS2 )
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{
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clrIdx = (color >> 4);
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ptr[2] = os2_palette[ clrIdx ].rgbtRed;
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ptr[1] = os2_palette[ clrIdx ].rgbtGreen;
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ptr[0] = os2_palette[ clrIdx ].rgbtBlue;
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clrIdx = (color & 0x0F);
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ptr[6] = os2_palette[ clrIdx ].rgbtRed;
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ptr[5] = os2_palette[ clrIdx ].rgbtGreen;
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ptr[4] = os2_palette[ clrIdx ].rgbtBlue;
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}
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else
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{
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clrIdx = (color >> 4);
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ptr[2] = win_palette[ clrIdx ].rgbRed;
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ptr[1] = win_palette[ clrIdx ].rgbGreen;
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ptr[0] = win_palette[ clrIdx ].rgbBlue;
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clrIdx = (color & 0x0F);
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ptr[6] = win_palette[ clrIdx ].rgbRed;
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ptr[5] = win_palette[ clrIdx ].rgbGreen;
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ptr[4] = win_palette[ clrIdx ].rgbBlue;
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}
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}
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break;
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}
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case 8:
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{
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// RGB 8 BITS
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for( col = 0; col < w; col++, ptr += 3 )
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{
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// read the current pixel
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unsigned char color = *((unsigned char *)(pBuff++));
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// convert indexed pixel (8 bits) into rgb (32 bits) pixel
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if( compression == BI_OS2 )
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{
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ptr[2] = os2_palette[ color ].rgbtRed;
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ptr[1] = os2_palette[ color ].rgbtGreen;
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ptr[0] = os2_palette[ color ].rgbtBlue;
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}
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else
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{
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ptr[2] = win_palette[ color ].rgbRed;
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ptr[1] = win_palette[ color ].rgbGreen;
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ptr[0] = win_palette[ color ].rgbBlue;
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}
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}
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break;
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}
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case 24:
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{
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// RGB 24 BITS
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for( col = 0; col < w; col++, ptr += 3 )
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{
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// convert bgr pixel (24 bits) into rgb (32 bits) pixel
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RGBTRIPLE *pix = (RGBTRIPLE *)pBuff;
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pBuff += sizeof( RGBTRIPLE );
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ptr[2] = pix->rgbtRed;
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ptr[1] = pix->rgbtGreen;
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ptr[0] = pix->rgbtBlue;
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}
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break;
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}
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case 32:
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{
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// RGB 32 BITS
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for( col = 0; col < w; col++, ptr += 3 )
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{
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// // convert bgr pixel (32 bits) into rgb (32 bits) pixel
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RGBQUAD *pix = (RGBQUAD *)pBuff;
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pBuff += sizeof( RGBQUAD );
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ptr[2] = pix->rgbRed;
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ptr[1] = pix->rgbGreen;
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ptr[0] = pix->rgbBlue;
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}
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break;
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}
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}
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}
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break;
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}
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case BI_RLE8:
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{
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// RLE 8 BITS
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for( row = h - 1; row >= 0; row-- )
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{
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if( flipvert )
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ptr = &(*pixels)[ row * w * 3 ];
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for( col = 0; col < w; /* nothing */ )
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{
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// get one packet (2 bytes)
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unsigned char byte1 = *((unsigned char *)(pBuff++));
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unsigned char byte2 = *((unsigned char *)(pBuff++));
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if( byte1 == RLE_COMMAND )
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{
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// absolute encoding
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for( i = 0; i < byte2; i++, ptr += 3, col++ )
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{
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// read the current pixel
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unsigned char color = *((unsigned char *)(pBuff++));
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// convert indexed pixel (8 bits) into rgb (32 bits) pixel
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ptr[2] = win_palette[ color ].rgbRed;
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ptr[1] = win_palette[ color ].rgbGreen;
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ptr[0] = win_palette[ color ].rgbBlue;
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}
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if( (byte2 % 2) == 1 )
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pBuff++;
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}
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else
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{
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// read next pixels
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for( i = 0; i < byte1; i++, ptr += 3, col++ )
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{
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// convert indexed pixel (8 bits) into rgb (32 bits) pixel
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ptr[2] = win_palette[ byte2 ].rgbRed;
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ptr[1] = win_palette[ byte2 ].rgbGreen;
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ptr[0] = win_palette[ byte2 ].rgbBlue;
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}
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}
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}
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}
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break;
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}
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case BI_RLE4:
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{
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// RLE 4 BITS
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unsigned char color;
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int bytesRead = 0; // number of bytes read
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for( row = h - 1; row >= 0; row-- )
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{
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if( flipvert )
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ptr = &(*pixels)[ row * w * 3 ];
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for( col = 0; col < w; /* nothing */ )
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{
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// get one packet (2 bytes)
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unsigned char byte1 = *((unsigned char *)(pBuff++));
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unsigned char byte2 = *((unsigned char *)(pBuff++));
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bytesRead += 2;
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if( byte1 == RLE_COMMAND )
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{
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// absolute encoding
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unsigned char databyte;
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for( i = 0; i < byte2; i++, ptr += 3, col++ )
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{
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if( (i % 2) == 0 )
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{
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// read the current pixel
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databyte = *((unsigned char *)(pBuff++));
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bytesRead++;
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color = (databyte >> 4); // 4 first bits
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}
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else
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{
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color = (databyte & 0x0F); // 4 last bits
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}
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// convert indexed pixel (4 bits) into rgb (32 bits) pixel
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ptr[2] = win_palette[ color ].rgbRed;
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ptr[1] = win_palette[ color ].rgbGreen;
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ptr[0] = win_palette[ color ].rgbBlue;
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}
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while( (bytesRead % 2) != 0 )
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{
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pBuff++;
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bytesRead++;
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|
|
}
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
// read next pixels
|
||
|
|
for( i = 0; i < byte1; i++, ptr += 3, col++ )
|
||
|
|
{
|
||
|
|
if( (i % 2) == 0 )
|
||
|
|
color = (byte2 >> 4); // 4 first bits
|
||
|
|
else
|
||
|
|
color = (byte2 & 0x0F); // 4 last bits
|
||
|
|
|
||
|
|
// convert indexed pixel (4 bits) into rgb (32 bits) pixel
|
||
|
|
ptr[2] = win_palette[ color ].rgbRed;
|
||
|
|
ptr[1] = win_palette[ color ].rgbGreen;
|
||
|
|
ptr[0] = win_palette[ color ].rgbBlue;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
// free buffer memory
|
||
|
|
delete [] buffer;
|
||
|
|
|
||
|
|
|
||
|
|
// return success
|
||
|
|
return 1;
|
||
|
|
}
|