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