| 发表于：2007-03-07 13:39:14 楼主 |
bool paintdib（hdc hdc, lprect lpdcrect, hdib hdib, lprect lpdibrect,
hpalette hpal, dword dwrop)
{
lpbyte lpdibhdr; // pointer to bitmapinfoheader
lpbyte lpdibbits; // pointer to dib bits
bool bsuccess=false; // success/fail flag
hpalette holdpal=null; // previous palette
// check for valid dib handle
if （!hdib)
return false;
// lock down the dib, and get a pointer to the beginning of the bit
// buffer
lpdibhdr = （lpbyte)globallock（hdib);
lpdibbits = finddibbits（lpdibhdr);
// if no palette provided, create one from dib
if （! hpal)
hpal = createdibpalette（lpdibhdr);
// select and realize our palette as background
if （hpal)
{
holdpal = selectpalette（hdc, hpal, true);
realizepalette（hdc);
}
// make sure to use the stretching mode best for color pictures
setstretchbltmode（hdc, coloroncolor);
// call stretchdibits（) with dwrop
bsuccess = stretchdibits（hdc,
lpdcrect-> left,
lpdcrect-> top,
rectwidth（lpdcrect),
rectheight（lpdcrect),
lpdibrect-> left,
（int)dibheight（lpdibhdr) - lpdibrect-> top - rectheight（lpdibrect),
rectwidth（lpdibrect),
rectheight（lpdibrect),
lpdibbits,
（lpbitmapinfo)lpdibhdr,
dib_rgb_colors,
srccopy);
// unlock the memory block
globalunlock（hdib);
// reselect old palette
if （holdpal)
selectpalette（hdc, holdpal, false);
// return with success/fail flag
return bsuccess;
}
该函数是我看书时见到的一个函数其中stretchdibits函数中的参数不是很明白，主要是
lpdibrect-> left,
（int)dibheight（lpdibhdr) - lpdibrect-> top - rectheight（lpdibrect),的含义尤其是 （int)dibheight（lpdibhdr) - lpdibrect-> top - rectheight（lpdibrect),
我不明白！
请高手指点
小弟在这里先行谢过了！！
谢谢！！！！
|
|
|
|
|
