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GRAPHIC
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HASH.H
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C/C++ Source or Header
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1991-12-10
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3KB
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76 lines
/*
* Copyright (c) 1987, 1988, 1989 Stanford University
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided
* that the above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation, and that the name of Stanford not be used in advertising or
* publicity pertaining to distribution of the software without specific,
* written prior permission. Stanford makes no representations about
* the suitability of this software for any purpose. It is provided "as is"
* without express or implied warranty.
*
* STANFORD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.
* IN NO EVENT SHALL STANFORD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* Hash table class for storing painters. On X10, SetColor, SetFont, etc.
* operations require a client-server ipc round-trip and hence are
* inefficient. To avoid this, we keep a hash table of painters that have
* preset colors, patterns, etc. When it's time to Draw a graphic, we
* use a painter whose graphics state matches the graphic's own. If none
* exists, then we create a new painter, set its graphics state to match
* the graphic's, and use it to draw the graphic. The new painter is stored
* in the hash table for future use.
*/
#ifndef hash_h
#define hash_h
class Entry;
class Graphic;
class Painter;
class HashTable {
public:
HashTable(int);
~HashTable();
void Insert(void* tag, void* value);
void Remove(void* tag);
void* Find(void* tag);
protected:
virtual boolean Match(void* target, void* entry);
virtual int Hash(void*);
protected:
Entry** entries;
int count;
};
class GraphicToPainter : public HashTable {
public:
GraphicToPainter(int);
~GraphicToPainter();
void Insert(Graphic*, Painter*&);
void Remove(Graphic* g) { HashTable::Remove(g); }
Painter* Find(Graphic* g);
void Clip(Canvas*, Coord, Coord, Coord, Coord);
void NoClip();
private:
boolean Match(void*, void*);
int Hash(void*);
private:
class Canvas* canvas;
class BoxObj* box;
};
#endif