DirectDraw 直接顯示RGB圖象的最簡單實作

來自：

#include "ddraw.h" 

class

cddraw 

{ 

public: 

void cleanup(); 

void

drawdib(bitmapinfoheader* pbi,char* pdata,rect*rt); 

bool

init(hwnd hwnd,int nwidth,int

nheight); 

cddraw(); 

virtual

~cddraw(); 

private: 

hwnd

m_hdrawwnd; 

lpdirectdraw lpdd; // directdraw

對象 

lpdirectdrawsurface lpddsprimary; // directdraw

首頁面 

lpdirectdrawsurface lpbackdds; 

lpdirectdrawclipper

lpclipperback; 

}; 

cddraw::cddraw() 

lpdd=null; 

lpddsprimary=null; 

lpbackdds=null; 

lpclipperback=null; 

} 

cddraw::~cddraw() 

if(lpdd!=null)cleanup(); 

cddraw::init(hwnd hwnd,int nwidth,int

nheight) 

if(hwnd==null) return

false; 

m_hdrawwnd=hwnd; 

if(directdrawcreate(null,&lpdd,null)!=dd_ok)return

lpdd->setcooperativelevel(hwnd,

ddscl_normal); 

ddsurfacedesc ddsd; 

ddsd.dwsize =

sizeof( ddsd ); //結構的大小 

ddsd.dwflags = ddsd_caps;

//指定ddsurfacedesc結構的ddscaps成員為可用 

ddsd.ddscaps.dwcaps =

ddscaps_primarysurface; //指定要建立的是首頁面 

//建立首頁面對象 

if (

lpdd->createsurface( &ddsd, &lpddsprimary, null ) != dd_ok)

return

if(lpdd->createclipper(null,&lpclipperback,null)!=dd_ok)

lpclipperback->sethwnd(0,hwnd); 

lpddsprimary->setclipper(lpclipperback); 

lpclipperback->release(); 

ddsd.dwflags

= ddsd_caps | ddsd_height | ddsd_width; 

ddscaps_offscreenplain; 

ddsd.dwheight =

nheight; 

ddsd.dwwidth =

nwidth; 

if(lpdd->createsurface(&ddsd, &lpbackdds,

null)!=dd_ok) return false; 

true; 

void cddraw::drawdib(bitmapinfoheader *pbi,

char *pdata, rect *rt) 

rect

srt; 

srt.left=0; 

srt.top=0; 

srt.right=pbi->biwidth; 

srt.bottom=pbi->biheight; 

hdc

hdc; 

lpbackdds->getdc(&hdc); 

setdibitstodevice( 

hdc, 

0, 

pbi->biwidth,

// source rectangle width 

pbi->biheight, // source rectangle

height 

0, // x-coord of source lower-left corner 

0, //

y-coord of source lower-left corner 

0, // first scan line in

array 

pbi->biheight, // number of scan lines 

pdata,

// array of dib bits 

(const struct tagbitmapinfo*)pbi, // bitmap

information 

dib_rgb_colors // rgb or palette

indexes 

); 

lpbackdds->releasedc(hdc); 

lpddsprimary->blt(rt,lpbackdds,&srt,0,null); 

cddraw::cleanup() 

{

if(lpdd!=null) 

if(lpclipperback!=null) 

if(lpddsprimary!=null) 

lpddsprimary->release(); 

if(lpbackdds!=null) 

lpbackdds->release(); 

lpdd->release(); 

}

(ixmy)

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