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- /* Auto: make
- */
-
- #define SCREENTOP\
- (screen->TopEdge << ((screen->ViewPort.Modes & LACE)? 0: 1))
-
- IMPORT struct SnapRsrc *SnapRsrc;
- IMPORT struct IntuitionBase *IntuitionBase;
- IMPORT struct MinList CachedWindows;
-
- struct Screen *WhichScreen()
- {
- REGISTER struct Screen *screen;
- Forbid();
- screen = IntuitionBase->FirstScreen;
- while (screen && IntuitionBase->MouseY < SCREENTOP) {
- screen = screen->NextScreen;
- }
- if (screen == NULL) { /* Shouldn't happen */
- screen = IntuitionBase->ActiveScreen;
- }
- Permit();
- return screen;
- }
-
- struct Window *WhichWindow(screen)
- struct Screen *screen;
- {
- struct Layer *layer;
- layer = (struct Layer *)WhichLayer(&screen->LayerInfo,
- (LONG)screen->MouseX, (LONG)screen->MouseY);
- if (layer) {
- return (struct Window *)layer->Window;
- } else {
- return NULL;
- }
- }
-
- VOID FreePlanes(bm, width, height)
- struct BitMap *bm;
- LONG width, height;
- {
- SHORT i;
- for (i=0; i < bm->Depth; i++) {
- if (bm->Planes[i]) {
- FreeRaster(bm->Planes[i], width, height);
- }
- }
- }
-
- WORD AllocPlanes(bm, width, height)
- struct BitMap *bm;
- LONG width, height;
- {
- WORD i;
- for (i=0; i < bm->Depth; i++) {
- bm->Planes[i] = NULL;
- }
- for (i=0; i < bm->Depth; i++) {
- if (!(bm->Planes[i] = AllocRaster(width, height))) {
- return 0;
- }
- BltClear(bm->Planes[i], RASSIZE(width, height), NULL);
- }
- return 1;
- }
-
- VOID CacheWindow(Win, xoff, yoff, fw, fh)
- struct Window *Win;
- LONG xoff;
- LONG yoff;
- SHORT fw;
- SHORT fh;
- {
- struct CacheWindow *cw;
- if (!(cw = AllocMem((LONG)sizeof(struct CacheWindow),
- MEMF_PUBLIC|MEMF_CLEAR))) {
- return;
- }
- cw->Window = Win;
- cw->xoff = xoff;
- cw->yoff = yoff;
- cw->fw = fw;
- cw->fh = fh;
- AddHead((struct List *)&CachedWindows, (struct Node *)cw);
- if (SnapRsrc->CacheSize > 0) {
- --SnapRsrc->CacheSize;
- } else {
- FreeMem(RemTail((struct List *)&CachedWindows),
- (LONG)sizeof(struct CacheWindow));
- }
- }
-
- struct CacheWindow *GetCachedWindow(Screen, Win)
- struct Screen *Screen;
- struct Window *Win;
- {
- struct CacheWindow *cw = (struct CacheWindow *)CachedWindows.mlh_Head;
-
- while (cw->Node.mln_Succ) {
- if (cw->Window == Win) {
- LONG LockVal = LockIBase(0L);
- REGISTER struct Window *w = Screen->FirstWindow;
- while (w && w != Win) {
- w = w->NextWindow;
- }
- UnlockIBase(LockVal);
- if (!w) {
- return NULL;
- }
- Remove((struct Node *)cw);
- AddHead((struct List *)&CachedWindows, (struct Node *)cw);
- return cw;
- }
- cw = (struct CacheWindow *)cw->Node.mln_Succ;
- }
- return NULL;
- }
-