static cwPicturePtr
cwCreatePicturePrivate(PicturePtr pPicture)
{
WindowPtr pWindow = (WindowPtr) pPicture->pDrawable;
PixmapPtr pPixmap = getCwPixmap(pWindow);
int error;
cwPicturePtr pPicturePrivate;
pPicturePrivate = malloc(sizeof(cwPictureRec));
if (!pPicturePrivate)
return NULL;
pPicturePrivate->pBackingPicture = CreatePicture(0, &pPixmap->drawable,
pPicture->pFormat,
0, 0, serverClient,
&error);
if (!pPicturePrivate->pBackingPicture) {
free(pPicturePrivate);
return NULL;
}
/*
* Ensure that this serial number does not match the window's
*/
pPicturePrivate->serialNumber = pPixmap->drawable.serialNumber;
pPicturePrivate->stateChanges = (1 << (CPLastBit + 1)) - 1;
setCwPicture(pPicture, pPicturePrivate);
return pPicturePrivate;
}
static PixmapPtr
cwGetWindowPixmap (WindowPtr pWin)
{
PixmapPtr pPixmap = getCwPixmap (pWin);
if (!pPixmap)
{
ScreenPtr pScreen = pWin->drawable.pScreen;
SCREEN_PROLOGUE(pScreen, GetWindowPixmap);
if (pScreen->GetWindowPixmap)
pPixmap = (*pScreen->GetWindowPixmap) (pWin);
SCREEN_EPILOGUE(pScreen, GetWindowPixmap, cwGetWindowPixmap);
}
return pPixmap;
}
/* Find the real drawable to draw to, and provide offsets that will translate
* window coordinates to backing pixmap coordinates.
*/
DrawablePtr
cwGetBackingDrawable(DrawablePtr pDrawable, int *x_off, int *y_off)
{
PixmapPtr pPixmap;
if (pDrawable->type == DRAWABLE_WINDOW &&
(pPixmap = getCwPixmap ((WindowPtr) pDrawable)))
{
*x_off = pDrawable->x - pPixmap->screen_x;
*y_off = pDrawable->y - pPixmap->screen_y;
return &pPixmap->drawable;
} else {
*x_off = *y_off = 0;
return pDrawable;
}
}
static PicturePtr
cwGetBackingPicture(PicturePtr pPicture, int *x_off, int *y_off)
{
cwPicturePrivate;
if (pPicturePrivate) {
DrawablePtr pDrawable = pPicture->pDrawable;
WindowPtr pWindow = (WindowPtr) pDrawable;
PixmapPtr pPixmap = getCwPixmap(pWindow);
*x_off = pDrawable->x - pPixmap->screen_x;
*y_off = pDrawable->y - pPixmap->screen_y;
return pPicturePrivate->pBackingPicture;
}
else {
*x_off = *y_off = 0;
return pPicture;
}
}