/*
* Setup clip region from device context's associated window or bitmap.
* Memory DC's are always associated with the desktop window, and are
* always visible. Return the DC's hwnd if window is visible.
*/
HWND
MwPrepareDC(HDC hdc)
{
HWND hwnd;
if(!hdc || !hdc->hwnd)
return NULL;
hwnd = hdc->hwnd;
if (hwnd->unmapcount)
return NULL;
/*
* If the window is not the currently clipped one, then
* make it the current one and define its clip rectangles.
*/
if(hdc != cliphdc) {
/* clip memory dc's to the bitmap size*/
if(hdc->psd->flags&PSF_MEMORY) {
#if DYNAMICREGIONS
GdSetClipRegion(hdc->psd,
GdAllocRectRegion(0, 0, hdc->psd->xvirtres,
hdc->psd->yvirtres));
#else
static MWCLIPRECT crc = {0, 0, 0, 0};
crc.width = hdc->psd->xvirtres;
crc.height = hdc->psd->yvirtres;
GdSetClipRects(hdc->psd, 1, &crc);
#endif
} else MwSetClipWindow(hdc);
cliphdc = hdc;
}
return hwnd;
}
/*
* Setup clip region from device context's associated window or bitmap.
* Memory DC's are always associated with the desktop window, and are
* always visible. Return the DC's hwnd if window is visible.
*/
HWND
MwPrepareDC(HDC hdc)
{
HWND hwnd;
if(!hdc || !hdc->hwnd)
return NULL;
hwnd = hdc->hwnd;
if (hwnd->unmapcount)
return NULL;
/*
* If the window is not the currently clipped one, then
* make it the current one and define its clip rectangles.
*/
if(hdc != cliphdc) {
/* clip memory dc's to the bitmap size*/
if(hdc->psd->flags&PSF_MEMORY) {
#if DYNAMICREGIONS
/* If hdc has a clip region, use it! */
if (hdc->region != NULL && hdc->region->rgn != NULL
&& hdc->region->rgn->size != 0) {
LPRECT rptr = &(hdc->region->rgn->extents);
MWCOORD left, top;
/* Bound left,top to 0,0 if they are negative
* to avoid an assertion later.
*/
left = (rptr->left <= 0) ? 0 : rptr->left;
top = (rptr->top <= 0) ? 0 : rptr->top;
GdSetClipRegion(hdc->psd,
GdAllocRectRegion(rptr->left, rptr->top,
rptr->right, rptr->bottom));
} else {
GdSetClipRegion(hdc->psd,
GdAllocRectRegion(0, 0,
hdc->psd->xvirtres, hdc->psd->yvirtres));
}
#else
static MWCLIPRECT crc = {0, 0, 0, 0};
/* If hdc has a clip region, use it! */
if (hdc->region != NULL && hdc->region->rgn != NULL
&& hdc->region->rgn->size != 0) {
LPRECT rptr = &(hdc->region->rgn->extents);
/* Bound left,top to 0,0 if they are negative
* to avoid an assertion later.
*/
if (rptr->left > 0)
crc.x = rptr->left;
if (rptr->top > 0)
crc.y = rptr->top;
crc.width = rptr->right;
crc.height = rptr->bottom;
} else {
crc.width = hdc->psd->xvirtres;
crc.height = hdc->psd->yvirtres;
}
GdSetClipRects(hdc->psd, 1, &crc);
#endif
} else MwSetClipWindow(hdc);
cliphdc = hdc;
}
return hwnd;
}
