+++ /dev/null
-/*
- * tkGC.c --
- *
- * This file maintains a database of read-only graphics contexts for the
- * Tk toolkit, in order to allow GC's to be shared.
- *
- * Copyright (c) 1990-1994 The Regents of the University of California.
- * Copyright (c) 1994 Sun Microsystems, Inc.
- *
- * See the file "license.terms" for information on usage and redistribution of
- * this file, and for a DISCLAIMER OF ALL WARRANTIES.
- */
-
-#include "tkInt.h"
-
-/*
- * One of the following data structures exists for each GC that is currently
- * active. The structure is indexed with two hash tables, one based on the
- * values in the graphics context and the other based on the display and GC
- * identifier.
- */
-
-typedef struct {
- GC gc; /* Graphics context. */
- Display *display; /* Display to which gc belongs. */
- int refCount; /* Number of active uses of gc. */
- Tcl_HashEntry *valueHashPtr;/* Entry in valueTable (needed when deleting
- * this structure). */
-} TkGC;
-
-typedef struct {
- XGCValues values; /* Desired values for GC. */
- Display *display; /* Display for which GC is valid. */
- int screenNum; /* screen number of display */
- int depth; /* and depth for which GC is valid. */
-} ValueKey;
-
-/*
- * Forward declarations for functions defined in this file:
- */
-
-static void GCInit(TkDisplay *dispPtr);
-\f
-/*
- *----------------------------------------------------------------------
- *
- * Tk_GetGC --
- *
- * Given a desired set of values for a graphics context, find a read-only
- * graphics context with the desired values.
- *
- * Results:
- * The return value is the X identifer for the desired graphics context.
- * The caller should never modify this GC, and should call Tk_FreeGC when
- * the GC is no longer needed.
- *
- * Side effects:
- * The GC is added to an internal database with a reference count. For
- * each call to this function, there should eventually be a call to
- * Tk_FreeGC, so that the database can be cleaned up when GC's aren't
- * needed anymore.
- *
- *----------------------------------------------------------------------
- */
-
-GC
-Tk_GetGC(
- Tk_Window tkwin, /* Window in which GC will be used. */
- register unsigned long valueMask,
- /* 1 bits correspond to values specified in
- * *valuesPtr; other values are set from
- * defaults. */
- register XGCValues *valuePtr)
- /* Values are specified here for bits set in
- * valueMask. */
-{
- ValueKey valueKey;
- Tcl_HashEntry *valueHashPtr, *idHashPtr;
- register TkGC *gcPtr;
- int isNew;
- Drawable d, freeDrawable;
- TkDisplay *dispPtr = ((TkWindow *) tkwin)->dispPtr;
-
- if (dispPtr->gcInit <= 0) {
- GCInit(dispPtr);
- }
-
- /*
- * Must zero valueKey at start to clear out pad bytes that may be part of
- * structure on some systems.
- */
-
- memset(&valueKey, 0, sizeof(valueKey));
-
- /*
- * First, check to see if there's already a GC that will work for this
- * request (exact matches only, sorry).
- */
-
- if (valueMask & GCFunction) {
- valueKey.values.function = valuePtr->function;
- } else {
- valueKey.values.function = GXcopy;
- }
- if (valueMask & GCPlaneMask) {
- valueKey.values.plane_mask = valuePtr->plane_mask;
- } else {
- valueKey.values.plane_mask = (unsigned) ~0;
- }
- if (valueMask & GCForeground) {
- valueKey.values.foreground = valuePtr->foreground;
- } else {
- valueKey.values.foreground = 0;
- }
- if (valueMask & GCBackground) {
- valueKey.values.background = valuePtr->background;
- } else {
- valueKey.values.background = 1;
- }
- if (valueMask & GCLineWidth) {
- valueKey.values.line_width = valuePtr->line_width;
- } else {
- valueKey.values.line_width = 0;
- }
- if (valueMask & GCLineStyle) {
- valueKey.values.line_style = valuePtr->line_style;
- } else {
- valueKey.values.line_style = LineSolid;
- }
- if (valueMask & GCCapStyle) {
- valueKey.values.cap_style = valuePtr->cap_style;
- } else {
- valueKey.values.cap_style = CapButt;
- }
- if (valueMask & GCJoinStyle) {
- valueKey.values.join_style = valuePtr->join_style;
- } else {
- valueKey.values.join_style = JoinMiter;
- }
- if (valueMask & GCFillStyle) {
- valueKey.values.fill_style = valuePtr->fill_style;
- } else {
- valueKey.values.fill_style = FillSolid;
- }
- if (valueMask & GCFillRule) {
- valueKey.values.fill_rule = valuePtr->fill_rule;
- } else {
- valueKey.values.fill_rule = EvenOddRule;
- }
- if (valueMask & GCArcMode) {
- valueKey.values.arc_mode = valuePtr->arc_mode;
- } else {
- valueKey.values.arc_mode = ArcPieSlice;
- }
- if (valueMask & GCTile) {
- valueKey.values.tile = valuePtr->tile;
- } else {
- valueKey.values.tile = None;
- }
- if (valueMask & GCStipple) {
- valueKey.values.stipple = valuePtr->stipple;
- } else {
- valueKey.values.stipple = None;
- }
- if (valueMask & GCTileStipXOrigin) {
- valueKey.values.ts_x_origin = valuePtr->ts_x_origin;
- } else {
- valueKey.values.ts_x_origin = 0;
- }
- if (valueMask & GCTileStipYOrigin) {
- valueKey.values.ts_y_origin = valuePtr->ts_y_origin;
- } else {
- valueKey.values.ts_y_origin = 0;
- }
- if (valueMask & GCFont) {
- valueKey.values.font = valuePtr->font;
- } else {
- valueKey.values.font = None;
- }
- if (valueMask & GCSubwindowMode) {
- valueKey.values.subwindow_mode = valuePtr->subwindow_mode;
- } else {
- valueKey.values.subwindow_mode = ClipByChildren;
- }
- if (valueMask & GCGraphicsExposures) {
- valueKey.values.graphics_exposures = valuePtr->graphics_exposures;
- } else {
- valueKey.values.graphics_exposures = True;
- }
- if (valueMask & GCClipXOrigin) {
- valueKey.values.clip_x_origin = valuePtr->clip_x_origin;
- } else {
- valueKey.values.clip_x_origin = 0;
- }
- if (valueMask & GCClipYOrigin) {
- valueKey.values.clip_y_origin = valuePtr->clip_y_origin;
- } else {
- valueKey.values.clip_y_origin = 0;
- }
- if (valueMask & GCClipMask) {
- valueKey.values.clip_mask = valuePtr->clip_mask;
- } else {
- valueKey.values.clip_mask = None;
- }
- if (valueMask & GCDashOffset) {
- valueKey.values.dash_offset = valuePtr->dash_offset;
- } else {
- valueKey.values.dash_offset = 0;
- }
- if (valueMask & GCDashList) {
- valueKey.values.dashes = valuePtr->dashes;
- } else {
- valueKey.values.dashes = 4;
- }
- valueKey.display = Tk_Display(tkwin);
- valueKey.screenNum = Tk_ScreenNumber(tkwin);
- valueKey.depth = Tk_Depth(tkwin);
- valueHashPtr = Tcl_CreateHashEntry(&dispPtr->gcValueTable,
- (char *) &valueKey, &isNew);
- if (!isNew) {
- gcPtr = Tcl_GetHashValue(valueHashPtr);
- gcPtr->refCount++;
- return gcPtr->gc;
- }
-
- /*
- * No GC is currently available for this set of values. Allocate a new GC
- * and add a new structure to the database.
- */
-
- gcPtr = ckalloc(sizeof(TkGC));
-
- /*
- * Find or make a drawable to use to specify the screen and depth of the
- * GC. We may have to make a small pixmap, to avoid doing
- * Tk_MakeWindowExist on the window.
- */
-
- freeDrawable = None;
- if (Tk_WindowId(tkwin) != None) {
- d = Tk_WindowId(tkwin);
- } else if (valueKey.depth ==
- DefaultDepth(valueKey.display, valueKey.screenNum)) {
- d = RootWindow(valueKey.display, valueKey.screenNum);
- } else {
- d = Tk_GetPixmap(valueKey.display,
- RootWindow(valueKey.display, valueKey.screenNum),
- 1, 1, valueKey.depth);
- freeDrawable = d;
- }
-
- gcPtr->gc = XCreateGC(valueKey.display, d, valueMask, &valueKey.values);
- gcPtr->display = valueKey.display;
- gcPtr->refCount = 1;
- gcPtr->valueHashPtr = valueHashPtr;
- idHashPtr = Tcl_CreateHashEntry(&dispPtr->gcIdTable,
- (char *) gcPtr->gc, &isNew);
- if (!isNew) {
- Tcl_Panic("GC already registered in Tk_GetGC");
- }
- Tcl_SetHashValue(valueHashPtr, gcPtr);
- Tcl_SetHashValue(idHashPtr, gcPtr);
- if (freeDrawable != None) {
- Tk_FreePixmap(valueKey.display, freeDrawable);
- }
-
- return gcPtr->gc;
-}
-\f
-/*
- *----------------------------------------------------------------------
- *
- * Tk_FreeGC --
- *
- * This function is called to release a graphics context allocated by
- * Tk_GetGC.
- *
- * Results:
- * None.
- *
- * Side effects:
- * The reference count associated with gc is decremented, and gc is
- * officially deallocated if no-one is using it anymore.
- *
- *----------------------------------------------------------------------
- */
-
-void
-Tk_FreeGC(
- Display *display, /* Display for which gc was allocated. */
- GC gc) /* Graphics context to be released. */
-{
- Tcl_HashEntry *idHashPtr;
- register TkGC *gcPtr;
- TkDisplay *dispPtr = TkGetDisplay(display);
-
- if (!dispPtr->gcInit) {
- Tcl_Panic("Tk_FreeGC called before Tk_GetGC");
- }
- if (dispPtr->gcInit < 0) {
- /*
- * The GCCleanup has been called, and remaining GCs have been freed.
- * This may still get called by other things shutting down, but the
- * GCs should no longer be in use.
- */
-
- return;
- }
-
- idHashPtr = Tcl_FindHashEntry(&dispPtr->gcIdTable, (char *) gc);
- if (idHashPtr == NULL) {
- Tcl_Panic("Tk_FreeGC received unknown gc argument");
- }
- gcPtr = Tcl_GetHashValue(idHashPtr);
- gcPtr->refCount--;
- if (gcPtr->refCount == 0) {
- Tk_FreeXId(gcPtr->display, (XID) XGContextFromGC(gcPtr->gc));
- XFreeGC(gcPtr->display, gcPtr->gc);
- Tcl_DeleteHashEntry(gcPtr->valueHashPtr);
- Tcl_DeleteHashEntry(idHashPtr);
- ckfree(gcPtr);
- }
-}
-\f
-/*
- *----------------------------------------------------------------------
- *
- * TkGCCleanup --
- *
- * Frees the structures used for GC management. We need to have it called
- * near the end, when other cleanup that calls Tk_FreeGC is all done.
- *
- * Results:
- * None.
- *
- * Side effects:
- * GC resources are freed.
- *
- *----------------------------------------------------------------------
- */
-
-void
-TkGCCleanup(
- TkDisplay *dispPtr) /* display to clean up resources in */
-{
- Tcl_HashEntry *entryPtr;
- Tcl_HashSearch search;
- TkGC *gcPtr;
-
- for (entryPtr = Tcl_FirstHashEntry(&dispPtr->gcIdTable, &search);
- entryPtr != NULL; entryPtr = Tcl_NextHashEntry(&search)) {
- gcPtr = Tcl_GetHashValue(entryPtr);
-
- /*
- * This call is not needed, as it is only used on Unix to restore the
- * Id to the stack pool, and we don't want to use them anymore.
- * Tk_FreeXId(gcPtr->display, (XID) XGContextFromGC(gcPtr->gc));
- */
-
- XFreeGC(gcPtr->display, gcPtr->gc);
- Tcl_DeleteHashEntry(gcPtr->valueHashPtr);
- Tcl_DeleteHashEntry(entryPtr);
- ckfree(gcPtr);
- }
- Tcl_DeleteHashTable(&dispPtr->gcValueTable);
- Tcl_DeleteHashTable(&dispPtr->gcIdTable);
- dispPtr->gcInit = -1;
-}
-\f
-/*
- *----------------------------------------------------------------------
- *
- * GCInit --
- *
- * Initialize the structures used for GC management.
- *
- * Results:
- * None.
- *
- * Side effects:
- * Read the code.
- *
- *----------------------------------------------------------------------
- */
-
-static void
-GCInit(
- TkDisplay *dispPtr)
-{
- if (dispPtr->gcInit < 0) {
- Tcl_Panic("called GCInit after GCCleanup");
- }
- dispPtr->gcInit = 1;
- Tcl_InitHashTable(&dispPtr->gcValueTable, sizeof(ValueKey)/sizeof(int));
- Tcl_InitHashTable(&dispPtr->gcIdTable, TCL_ONE_WORD_KEYS);
-}
-\f
-/*
- * Local Variables:
- * mode: c
- * c-basic-offset: 4
- * fill-column: 78
- * End:
- */
OSDN Git Service
