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kolibrios/programs/media/imgview/formats/bmp.cpp

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#include "..\kosSyst.h"
#include "bmp.h"
int BMPFile::LoadBMPFile(Byte* filebuff, Dword filesize)
{
Dword offset;
memcpy((Byte*)&Bmp_head,(Byte*)filebuff,sizeof(tagBITMAPFILEHEADER));
memcpy((Byte*)&Info_head,(Byte*)filebuff+14,sizeof(tagBITMAPINFOHEADER));
width=Info_head.biWidth;
height=Info_head.biHeight;
offset=(Dword)Bmp_head.bfOffbits;
int state=0;
if (Bmp_head.bfType==0x4d42 && !Info_head.biCompression)
{
Byte* cBuffer;
Byte* pImg;
Byte* pPal;
Dword x,y;
Byte r;
Dword s,p;
Dword cWidth;
int i;
buffer=kos_GetMemory(width*height*3);
pImg=filebuff+offset;
pPal=filebuff+53;
int align_bytes = (4 - ((width * 3) % 4)) % 4;
Dword bpp = Info_head.biBitCount;
switch(Info_head.biBitCount)
{
/* 16,24,32-bit decoding */
case 32:
case 24:
case 16:
for(y=height-1;y!=-1;y--)
{
for(x=0;x<width;x++)
{
cBuffer=buffer+(y*width*3)+x*3;
if (Info_head.biBitCount==16)
{
*(cBuffer+0)=(Byte)((*(Word*)(pImg)) & 31)<<3;
*(cBuffer+1)=(Byte)((*(Word*)(pImg)>>5) & 31)<<3;
*(cBuffer+2)=(Byte)((*(Word*)(pImg)>>10) & 31)<<3;
} else {
*(cBuffer+0)=*(pImg+0);
*(cBuffer+1)=*(pImg+1);
*(cBuffer+2)=*(pImg+2);
}
pImg=pImg+Info_head.biBitCount/8;
}
pImg=pImg+align_bytes;
}
break;
/* 8-bit decoding */
case 8:
for(y=height-1;y!=-1;y--)
{
for(x=0;x<width;x++)
{
r=*(pImg); pImg++;
cBuffer=buffer+(y*width*3)+x*3;
*(cBuffer+0)=(Byte)(pPal[r*4+1]);
*(cBuffer+1)=(Byte)(pPal[r*4+2]);
*(cBuffer+2)=(Byte)(pPal[r*4+3]);
}
}
break;
/* 1,4-bit decode */
case 4:
case 1:
for(y=height-1;y!=-1;y--)
{
x=0;
while(x<width-1)
{
s=*(Dword*)(pImg);
pImg=pImg+4;
__asm
{
mov eax,s
bswap eax
mov s,eax
}
for(i=0;i<32/bpp;i++)
{
if (x>=width) break;
__asm
{
mov eax,s
mov ecx,bpp
rol eax,cl
mov s,eax
mov ebx,1
shl ebx,cl
dec ebx
and eax,ebx
mov p,eax
}
cBuffer=buffer+(y*width*3)+x*3;
*(cBuffer+0)=(Byte)(pPal[p*4+1]);
*(cBuffer+1)=(Byte)(pPal[p*4+2]);
*(cBuffer+2)=(Byte)(pPal[p*4+3]);
x++;
}
}
}
break;
default:
state=1;
break;
}
} else {
state=1;
}
return state;
}