class ZAPGBITMAP
{
public:
WORD identifier; // Identifies type of bitmap, must be BM
DWORD fileSize; // Size of the file
DWORD reserved1; // Reserved - not used
DWORD dataOffset; // Offset from start of file till data
DWORD headerSize; // Size of bitmap info header. must be 28h
DWORD width; // Width of bitmap in pixels
DWORD height; // Height of bitmap in pixels
WORD planes; // Number of planes in bitmap
WORD bpp; // Bits per pixel
DWORD compression; // Type of compresssion
DWORD bitmapDataSize; // Size of bitmap in bytes
DWORD hResolution; // Horizontal resolution
DWORD vResolution; // Vertical resolution
DWORD colors; // Number of colors, EG, 256, 65536, etc
DWORD importantColors; // Number of important colours
DWORD strangeSenselessPacking[4];
// We skip palette, won''t be reading in any 256 colour bm''s!
BYTE *bitmapData;
void Release()
{
delete []bitmapData;
}
};
void ReadBitmap(ZAPGBITMAP *bm, FILE *fp)
{
fread( &bm->identifier, sizeof(WORD), 1, fp);
fread( &bm->fileSize, sizeof(DWORD), 1, fp);
fread( &bm->reserved1, sizeof(DWORD), 1, fp);
fread( &bm->dataOffset, sizeof(DWORD), 1, fp);
fread( &bm->headerSize, sizeof(DWORD), 1, fp);
fread( &bm->width, sizeof(DWORD), 1, fp);
fread( &bm->height, sizeof(DWORD), 1, fp);
fread( &bm->planes, sizeof(WORD), 1, fp);
fread( &bm->bpp, sizeof(WORD), 1, fp);
fread( &bm->compression, sizeof(DWORD), 1, fp);
fread( &bm->bitmapDataSize, sizeof(DWORD), 1, fp);
fread( &bm->hResolution, sizeof(DWORD), 1, fp);
fread( &bm->vResolution, sizeof(DWORD), 1, fp);
fread( &bm->strangeSenselessPacking, sizeof(DWORD), 4, fp);
bm->bitmapData=new BYTE [bm->bitmapDataSize];
fread( bm->bitmapData, 1, bm->bitmapDataSize, fp);
}
Bitmap Loading
Author
I''m trying to write a program that converts Windows 24 bit bitmaps to my own SPR file format. (I''m creating a multiplatform gaming library, so I don''t want to use the Windows loading functions to get images into my game) The thing is, I''m having troubles loading the data. it''s getting messed up somehow. I created a bitmap structure to handle it for me, and here''s the code I have. I''m open to any suggestions as to why this might be (I mean, the data is messed up in a different way then the bitmap being flipped)
Why are you using all those freads? Just read them all in at once.
Declare two structs:
BITMAPFILEHEADER bitmapfileheader; // ID,file size, pointer to the data
BITMAPINFOHEADER bitmapinfoheader; // image size,width,height,etc.
And read in the entire fileheader first, then the entire infoheader. The
BGR bits for a 24-bit bitmap will follow next. Allocate a buffer and read
all of this in too. Simple.
And remember that the bits are DWORD aligned per scanline if you plan to use
those bits in another format.
Declare two structs:
BITMAPFILEHEADER bitmapfileheader; // ID,file size, pointer to the data
BITMAPINFOHEADER bitmapinfoheader; // image size,width,height,etc.
And read in the entire fileheader first, then the entire infoheader. The
BGR bits for a 24-bit bitmap will follow next. Allocate a buffer and read
all of this in too. Simple.
And remember that the bits are DWORD aligned per scanline if you plan to use
those bits in another format.
This topic is closed to new replies.
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