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- /* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
- * Copyright 2016-2019 Brian P. Hinz
- *
- * This is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This software is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this software; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
- * USA.
- */
-
- // -=- Generic pixel buffer class
-
- package com.tigervnc.rfb;
-
- import java.awt.*;
- import java.awt.image.*;
- import java.awt.Color;
- import java.nio.*;
- import java.util.concurrent.atomic.*;
-
- public abstract class PixelBuffer {
-
- // We do a lot of byte offset calculations that assume the result fits
- // inside a signed 32 bit integer. Limit the maximum size of pixel
- // buffers so that these calculations never overflow.
-
- static final int maxPixelBufferWidth = 16384;
- static final int maxPixelBufferHeight = 16384;
-
- public PixelBuffer(PixelFormat pf, int w, int h) {
- format = pf;
- width_ = w;
- height_= h;
- setSize(w, h);
- }
-
- protected PixelBuffer() { width_ = 0; height_ = 0; }
-
- // Get pixel format
- public final PixelFormat getPF() { return format; }
-
- // Get width, height and number of pixels
- public final int width() { return width_; }
- public final int height() { return height_; }
- public final int area() { return width_ * height_; }
-
- // Get rectangle encompassing this buffer
- // Top-left of rectangle is either at (0,0), or the specified point.
- public final Rect getRect() { return new Rect(0, 0, width_, height_); }
- public final Rect getRect(Point pos) {
- return new Rect(pos, pos.translate(new Point(width_, height_)));
- }
-
- ///////////////////////////////////////////////
- // Access to pixel data
- //
-
- // Get a pointer into the buffer
- // The pointer is to the top-left pixel of the specified Rect.
- public abstract Raster getBuffer(Rect r);
-
- // Get pixel data for a given part of the buffer
- // Data is copied into the supplied buffer, with the specified
- // stride. Try to avoid using this though as getBuffer() will in
- // most cases avoid the extra memory copy.
- //void getImage(void* imageBuf, const Rect& r, int stride=0) const;
- // Get pixel data in a given format
- // Works just the same as getImage(), but guaranteed to be in a
- // specific format.
- //void getImage(const PixelFormat& pf, void* imageBuf,
- // const Rect& r, int stride=0) const;
- public Image getImage() { return image; }
-
- public void setSize(int width, int height)
- {
- if ((width < 0) || (width > maxPixelBufferWidth))
- throw new Exception("Invalid PixelBuffer width of "+width+" pixels requested");
- if ((height < 0) || (height > maxPixelBufferHeight))
- throw new Exception("Invalid PixelBuffer height of "+height+" pixels requested");
-
- width_ = width;
- height_ = height;
- }
-
- ///////////////////////////////////////////////
- // Framebuffer update methods
- //
-
- // Ensure that the specified rectangle of buffer is up to date.
- // Overridden by derived classes implementing framebuffer access
- // to copy the required display data into place.
- //public abstract void grabRegion(Region& region) {}
-
- protected PixelFormat format;
- protected int width_, height_;
- protected Image image;
- }
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