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/* $Header$ */ |
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|
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/* |
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* tkGC.c -- |
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* |
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* This file maintains a database of read-only graphics contexts |
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* for the Tk toolkit, in order to allow GC's to be shared. |
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* |
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* Copyright (c) 1990-1994 The Regents of the University of California. |
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* Copyright (c) 1994 Sun Microsystems, Inc. |
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* |
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* See the file "license.terms" for information on usage and redistribution |
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* of this file, and for a DISCLAIMER OF ALL WARRANTIES. |
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* |
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* RCS: @(#) $Id: tkgc.c,v 1.1.1.1 2001/06/13 05:01:12 dtashley Exp $ |
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*/ |
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|
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#include "tkPort.h" |
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#include "tkInt.h" |
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|
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/* |
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* One of the following data structures exists for each GC that is |
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* currently active. The structure is indexed with two hash tables, |
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* one based on the values in the graphics context and the other |
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* based on the display and GC identifier. |
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*/ |
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|
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typedef struct { |
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GC gc; /* Graphics context. */ |
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Display *display; /* Display to which gc belongs. */ |
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int refCount; /* Number of active uses of gc. */ |
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Tcl_HashEntry *valueHashPtr;/* Entry in valueTable (needed when deleting |
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* this structure). */ |
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} TkGC; |
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|
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typedef struct { |
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XGCValues values; /* Desired values for GC. */ |
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Display *display; /* Display for which GC is valid. */ |
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int screenNum; /* screen number of display */ |
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int depth; /* and depth for which GC is valid. */ |
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} ValueKey; |
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|
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/* |
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* Forward declarations for procedures defined in this file: |
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*/ |
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|
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static void GCInit _ANSI_ARGS_((TkDisplay *dispPtr)); |
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|
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/* |
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*---------------------------------------------------------------------- |
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* |
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* Tk_GetGC -- |
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* |
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* Given a desired set of values for a graphics context, find |
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* a read-only graphics context with the desired values. |
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* |
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* Results: |
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* The return value is the X identifer for the desired graphics |
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* context. The caller should never modify this GC, and should |
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* call Tk_FreeGC when the GC is no longer needed. |
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* |
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* Side effects: |
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* The GC is added to an internal database with a reference count. |
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* For each call to this procedure, there should eventually be a call |
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* to Tk_FreeGC, so that the database can be cleaned up when GC's |
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* aren't needed anymore. |
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* |
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*---------------------------------------------------------------------- |
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*/ |
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|
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GC |
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Tk_GetGC(tkwin, valueMask, valuePtr) |
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Tk_Window tkwin; /* Window in which GC will be used. */ |
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register unsigned long valueMask; |
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/* 1 bits correspond to values specified |
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* in *valuesPtr; other values are set |
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* from defaults. */ |
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register XGCValues *valuePtr; |
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/* Values are specified here for bits set |
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* in valueMask. */ |
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{ |
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ValueKey valueKey; |
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Tcl_HashEntry *valueHashPtr, *idHashPtr; |
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register TkGC *gcPtr; |
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int new; |
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Drawable d, freeDrawable; |
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TkDisplay *dispPtr = ((TkWindow *) tkwin)->dispPtr; |
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|
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if (!dispPtr->gcInit) { |
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GCInit(dispPtr); |
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} |
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|
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/* |
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* Must zero valueKey at start to clear out pad bytes that may be |
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* part of structure on some systems. |
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*/ |
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|
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memset((VOID *) &valueKey, 0, sizeof(valueKey)); |
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|
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/* |
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* First, check to see if there's already a GC that will work |
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* for this request (exact matches only, sorry). |
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*/ |
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|
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if (valueMask & GCFunction) { |
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valueKey.values.function = valuePtr->function; |
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} else { |
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valueKey.values.function = GXcopy; |
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} |
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if (valueMask & GCPlaneMask) { |
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valueKey.values.plane_mask = valuePtr->plane_mask; |
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} else { |
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valueKey.values.plane_mask = (unsigned) ~0; |
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} |
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if (valueMask & GCForeground) { |
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valueKey.values.foreground = valuePtr->foreground; |
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} else { |
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valueKey.values.foreground = 0; |
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} |
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if (valueMask & GCBackground) { |
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valueKey.values.background = valuePtr->background; |
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} else { |
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valueKey.values.background = 1; |
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} |
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if (valueMask & GCLineWidth) { |
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valueKey.values.line_width = valuePtr->line_width; |
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} else { |
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valueKey.values.line_width = 0; |
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} |
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if (valueMask & GCLineStyle) { |
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valueKey.values.line_style = valuePtr->line_style; |
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} else { |
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valueKey.values.line_style = LineSolid; |
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} |
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if (valueMask & GCCapStyle) { |
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valueKey.values.cap_style = valuePtr->cap_style; |
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} else { |
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valueKey.values.cap_style = CapButt; |
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} |
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if (valueMask & GCJoinStyle) { |
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valueKey.values.join_style = valuePtr->join_style; |
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} else { |
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valueKey.values.join_style = JoinMiter; |
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} |
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if (valueMask & GCFillStyle) { |
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valueKey.values.fill_style = valuePtr->fill_style; |
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} else { |
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valueKey.values.fill_style = FillSolid; |
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} |
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if (valueMask & GCFillRule) { |
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valueKey.values.fill_rule = valuePtr->fill_rule; |
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} else { |
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valueKey.values.fill_rule = EvenOddRule; |
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} |
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if (valueMask & GCArcMode) { |
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valueKey.values.arc_mode = valuePtr->arc_mode; |
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} else { |
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valueKey.values.arc_mode = ArcPieSlice; |
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} |
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if (valueMask & GCTile) { |
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valueKey.values.tile = valuePtr->tile; |
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} else { |
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valueKey.values.tile = None; |
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} |
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if (valueMask & GCStipple) { |
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valueKey.values.stipple = valuePtr->stipple; |
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} else { |
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valueKey.values.stipple = None; |
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} |
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if (valueMask & GCTileStipXOrigin) { |
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valueKey.values.ts_x_origin = valuePtr->ts_x_origin; |
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} else { |
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valueKey.values.ts_x_origin = 0; |
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} |
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if (valueMask & GCTileStipYOrigin) { |
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valueKey.values.ts_y_origin = valuePtr->ts_y_origin; |
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} else { |
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valueKey.values.ts_y_origin = 0; |
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} |
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if (valueMask & GCFont) { |
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valueKey.values.font = valuePtr->font; |
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} else { |
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valueKey.values.font = None; |
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} |
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if (valueMask & GCSubwindowMode) { |
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valueKey.values.subwindow_mode = valuePtr->subwindow_mode; |
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} else { |
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valueKey.values.subwindow_mode = ClipByChildren; |
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} |
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if (valueMask & GCGraphicsExposures) { |
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valueKey.values.graphics_exposures = valuePtr->graphics_exposures; |
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} else { |
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valueKey.values.graphics_exposures = True; |
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} |
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if (valueMask & GCClipXOrigin) { |
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valueKey.values.clip_x_origin = valuePtr->clip_x_origin; |
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} else { |
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valueKey.values.clip_x_origin = 0; |
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} |
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if (valueMask & GCClipYOrigin) { |
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valueKey.values.clip_y_origin = valuePtr->clip_y_origin; |
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} else { |
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valueKey.values.clip_y_origin = 0; |
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} |
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if (valueMask & GCClipMask) { |
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valueKey.values.clip_mask = valuePtr->clip_mask; |
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} else { |
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valueKey.values.clip_mask = None; |
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} |
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if (valueMask & GCDashOffset) { |
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valueKey.values.dash_offset = valuePtr->dash_offset; |
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} else { |
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valueKey.values.dash_offset = 0; |
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} |
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if (valueMask & GCDashList) { |
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valueKey.values.dashes = valuePtr->dashes; |
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} else { |
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valueKey.values.dashes = 4; |
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} |
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valueKey.display = Tk_Display(tkwin); |
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valueKey.screenNum = Tk_ScreenNumber(tkwin); |
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valueKey.depth = Tk_Depth(tkwin); |
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valueHashPtr = Tcl_CreateHashEntry(&dispPtr->gcValueTable, |
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(char *) &valueKey, &new); |
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if (!new) { |
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gcPtr = (TkGC *) Tcl_GetHashValue(valueHashPtr); |
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gcPtr->refCount++; |
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return gcPtr->gc; |
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} |
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|
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/* |
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* No GC is currently available for this set of values. Allocate a |
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* new GC and add a new structure to the database. |
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*/ |
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|
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gcPtr = (TkGC *) ckalloc(sizeof(TkGC)); |
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|
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/* |
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* Find or make a drawable to use to specify the screen and depth |
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* of the GC. We may have to make a small pixmap, to avoid doing |
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* Tk_MakeWindowExist on the window. |
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*/ |
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|
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freeDrawable = None; |
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if (Tk_WindowId(tkwin) != None) { |
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d = Tk_WindowId(tkwin); |
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} else if (valueKey.depth == |
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DefaultDepth(valueKey.display, valueKey.screenNum)) { |
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d = RootWindow(valueKey.display, valueKey.screenNum); |
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} else { |
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d = Tk_GetPixmap(valueKey.display, |
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RootWindow(valueKey.display, valueKey.screenNum), |
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1, 1, valueKey.depth); |
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freeDrawable = d; |
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} |
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|
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gcPtr->gc = XCreateGC(valueKey.display, d, valueMask, &valueKey.values); |
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gcPtr->display = valueKey.display; |
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gcPtr->refCount = 1; |
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gcPtr->valueHashPtr = valueHashPtr; |
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idHashPtr = Tcl_CreateHashEntry(&dispPtr->gcIdTable, |
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(char *) gcPtr->gc, &new); |
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if (!new) { |
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panic("GC already registered in Tk_GetGC"); |
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} |
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Tcl_SetHashValue(valueHashPtr, gcPtr); |
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Tcl_SetHashValue(idHashPtr, gcPtr); |
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if (freeDrawable != None) { |
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Tk_FreePixmap(valueKey.display, freeDrawable); |
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} |
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|
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return gcPtr->gc; |
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} |
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|
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/* |
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*---------------------------------------------------------------------- |
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* |
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* Tk_FreeGC -- |
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* |
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* This procedure is called to release a graphics context allocated by |
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* Tk_GetGC. |
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* |
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* Results: |
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* None. |
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* |
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* Side effects: |
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* The reference count associated with gc is decremented, and |
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* gc is officially deallocated if no-one is using it anymore. |
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* |
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*---------------------------------------------------------------------- |
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*/ |
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|
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void |
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Tk_FreeGC(display, gc) |
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Display *display; /* Display for which gc was allocated. */ |
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GC gc; /* Graphics context to be released. */ |
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{ |
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Tcl_HashEntry *idHashPtr; |
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register TkGC *gcPtr; |
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TkDisplay *dispPtr = TkGetDisplay(display); |
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|
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if (!dispPtr->gcInit) { |
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panic("Tk_FreeGC called before Tk_GetGC"); |
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} |
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|
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idHashPtr = Tcl_FindHashEntry(&dispPtr->gcIdTable, (char *) gc); |
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if (idHashPtr == NULL) { |
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panic("Tk_FreeGC received unknown gc argument"); |
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} |
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gcPtr = (TkGC *) Tcl_GetHashValue(idHashPtr); |
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gcPtr->refCount--; |
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if (gcPtr->refCount == 0) { |
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Tk_FreeXId(gcPtr->display, (XID) XGContextFromGC(gcPtr->gc)); |
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XFreeGC(gcPtr->display, gcPtr->gc); |
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Tcl_DeleteHashEntry(gcPtr->valueHashPtr); |
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Tcl_DeleteHashEntry(idHashPtr); |
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ckfree((char *) gcPtr); |
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} |
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} |
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|
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/* |
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*---------------------------------------------------------------------- |
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* |
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* GCInit -- |
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* |
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* Initialize the structures used for GC management. |
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* |
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* Results: |
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* None. |
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* |
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* Side effects: |
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* Read the code. |
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* |
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*---------------------------------------------------------------------- |
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*/ |
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|
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static void |
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GCInit(dispPtr) |
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TkDisplay *dispPtr; |
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{ |
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dispPtr->gcInit = 1; |
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Tcl_InitHashTable(&dispPtr->gcValueTable, sizeof(ValueKey)/sizeof(int)); |
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Tcl_InitHashTable(&dispPtr->gcIdTable, TCL_ONE_WORD_KEYS); |
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} |
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|
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/* End of tkgc.c */ |
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