Reading BMP image files in the game

Display images using DirectX SDK. One is reading BMP files from files, and the other is reading files from memory (to read files for packaging files). I have tested it, calling this function to read image files is faster than the built-in system. Unfortunately, I have not completed the function. Currently, only 24 Real-color BMP images are supported, because my game runs in 32 bits, I have added ......

Parameter description: whether the filename file name iscolorkey in the target page of lpddstemp has a transparent color_key.
Bool loadbitmap (lpdirectdrawsu *** ce7 lpddstemp, char * filename, bool iscolorkey, colorref color_key)
{
Bitmapfileheader head;
Bitmapinfoheader Info;
File * FP;

Fp = fopen (filename, "rb ");
If (FP = NULL ){
Return-1;
}

Fread (& head, sizeof (bitmapfileheader), 1, FP );

If (head. bftype! = 19778 ){
Fclose (FP );
Return-2;
}

Fread (& info, sizeof (bitmapinfoheader), 1, FP );

Ddsu *** cedesc2 ddsd;

Memset (& ddsd, 0, sizeof (ddsd ));
Ddsd. dwsize = sizeof (ddsd );
If (lpddstemp-> getsu *** cedesc (& ddsd )! = Dd_ OK ){
Fclose (FP );
Return-3;
}

If (ddsd. dwwidth! = (DWORD) info. biwidth) | (ddsd. dwheight! = (DWORD) info. biheight )){
Fclose (FP );

Return-4;
}

Switch (info. bibitcount ){
Case 8:
{
Rgbquad * RGB = new rgbquad [256];
If (RGB = NULL ){
Fclose (FP );
Return-5;
}

Fread (RGB, sizeof (rgbquad), 256, FP );
Byte * buffer = new byte [info. bisizeimage];
If (buffer = NULL ){
Fclose (FP );
Return-6;
}
Fseek (FP, head. bfoffbits, seek_set );
Fread (buffer, sizeof (byte), info. bisizeimage, FP );
Fclose (FP );

Break;
}
Case 24:
{
Byte * buffer = new byte [info. bisizeimage];
If (buffer = NULL ){
Fclose (FP );
Return-7;
}

Fseek (FP, head. bfoffbits, seek_set );
Fread (buffer, info. bisizeimage, 1, FP );
Fclose (FP );

Memset (& ddsd, 0, sizeof (ddsd ));
Ddsd. dwsize = sizeof (ddsd );

If (lpddstemp-> lock (null, & ddsd, ddlock_wait | ddlock_writeonly, 0 )! = Dd_ OK ){
Fclose (FP );
Return-8;
}

Byte * pTMP = (byte *) ddsd. lpsu *** CE;
Byte * PRC = buffer + info. bisizeimage;
Int size_width = info. biwidth * 3 + (info. biwidth % 4 );
Int size1 = 0;
Int size2 = 0;

For (INT I = 0; I <info. biheight; I ++ ){
PRC-= size_width;
For (Int J = 0; j <info. biwidth; j ++ ){
Memcpy (& pTMP [size1], & PRC [size2], 3 );
PTMP [size1 + 3] = 0;

Size1 + = 4;
Size2 + = 3;
}

Size2 = 0;
Size1 = 0;

PTMP + = ddsd. lpitch;
}

If (lpddstemp-> unlock (null )! = Dd_ OK ){
Return-9;
}
Delete [] buffer;
Buffer = NULL;

Break;
}
}

If (iscolorkey ){
If (ddsetcolorkey (lpddstemp, color_key )! = Dd_ OK ){
Return-10;
}
}

Return true;
}

Parameter description: whether the iscolorkey of the BMP buffer memory data on the target page of lpddstemp has a transparent color_key.
Bool loadmembitmap (lpdirectdrawsu *** ce7 lpddstemp, byte * BMP buffer, bool iscolorkey, colorref color_key)
{
Bitmapfileheader head;
Bitmapinfoheader Info;
Long BMP _offset = 0;

If (BMP buffer = NULL ){
Return false;
}

Memcpy (& head, & BMP buffer [BMP _offset], sizeof (bitmapfileheader ));
BMP _offset + = sizeof (bitmapfileheader );

If (head. bftype! = 19778 ){
Return false;
}

Memcpy (& info, & BMP buffer [BMP _offset], sizeof (bitmapinfoheader ));
BMP _offset + = sizeof (bitmapinfoheader );

Ddsu *** cedesc2 ddsd;

Memset (& ddsd, 0, sizeof (ddsd ));
Ddsd. dwsize = sizeof (ddsd );
If (lpddstemp-> getsu *** cedesc (& ddsd )! = Dd_ OK ){
Return false;
}

If (ddsd. dwwidth! = (DWORD) info. biwidth) | (ddsd. dwheight! = (DWORD) info. biheight )){
Return false;
}

Switch (info. bibitcount ){
Case 8:
{
Rgbquad * RGB = new rgbquad [256];
If (RGB = NULL ){
Return false;
}

// Fread (RGB, sizeof (rgbquad), 256, FP );
Byte * buffer = new byte [info. bisizeimage];
If (buffer = NULL ){
Return false;
}

Break;
}
Case 24:
{
Byte * buffer = new byte [info. bisizeimage];
If (buffer = NULL ){
Return false;
}

Memcpy (buffer, & BMP buffer [head. bfoffbits], info. bisizeimage );

Memset (& ddsd, 0, sizeof (ddsd ));
Ddsd. dwsize = sizeof (ddsd );
If (lpddstemp-> lock (null, & ddsd, ddlock_wait | ddlock_writeonly, 0 )! = Dd_ OK ){
Return false;
}

Byte * pTMP = (byte *) ddsd. lpsu *** CE;
Byte * PRC = buffer + info. bisizeimage;
Int size_tmp = info. biwidth * 3 + info. biwidth % 4;
Int size1 = 0;
Int size2 = 0;

For (INT I = 0; I <info. biheight; I ++ ){
PRC-= size_tmp;
For (Int J = 0; j <info. biwidth; j ++ ){
Memcpy (& pTMP [size1], & PRC [size2], 3 );
PTMP [size1 + 3] = 0;

Size1 + = 4;
Size2 + = 3;
}

Size2 = 0;
}

If (lpddstemp-> unlock (null )! = Dd_ OK ){
Return false;
}
Delete [] buffer;
Buffer = NULL;

Break;
}
}

If (iscolorkey ){
If (ddsetcolorkey (lpddstemp, color_key )! = Dd_ OK ){
Return false;
}
}

Return true;
}