mirror of https://github.com/badvision/jace.git
63 lines
2.3 KiB
Java
63 lines
2.3 KiB
Java
/*
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* Copyright (C) 2012 Brendan Robert (BLuRry) brendan.robert@gmail.com.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301 USA
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*/
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package jace.core;
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import java.awt.image.BufferedImage;
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/**
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* VideoWriter is an abstraction of a graphics display mode that knows how to
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* render a scanline a certain way (lo-res, hi-res, text, etc) over a specific
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* range of memory (as determined by getYOffset.) Dirty flags are used to mark
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* scanlines that were altered and require redraw. This is the key to only
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* updating the screen as needed instead of drawing all the time at the expense
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* of CPU.
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*
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* @author Brendan Robert (BLuRry) brendan.robert@gmail.com
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*/
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public abstract class VideoWriter {
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public abstract void displayByte(BufferedImage screen, int xOffset, int y, int yTextOffset, int yGraphicsOffset);
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// This is used to support composite mixed-mode writers so that we can talk to the writer being used for a scanline
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public VideoWriter actualWriter() {
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return this;
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}
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public abstract int getYOffset(int y);
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// Dirty flags allow us to know if a scanline has or has not changed
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// Very useful for knowing if we should bother drawing changes
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private final boolean[] dirtyFlags = new boolean[192];
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public void markDirty(int y) {
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actualWriter().dirtyFlags[y] = true;
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}
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public void clearDirty(int y) {
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actualWriter().dirtyFlags[y] = false;
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}
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public boolean isRowDirty(int y) {
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return actualWriter().dirtyFlags[y];
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}
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public boolean isMixed() {
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return false;
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}
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}
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