From 554fd8c5195424bdbcabf5de30fdc183aba391bd Mon Sep 17 00:00:00 2001 From: upstream source tree Date: Sun, 15 Mar 2015 20:14:05 -0400 Subject: obtained gcc-4.6.4.tar.bz2 from upstream website; verified gcc-4.6.4.tar.bz2.sig; imported gcc-4.6.4 source tree from verified upstream tarball. downloading a git-generated archive based on the 'upstream' tag should provide you with a source tree that is binary identical to the one extracted from the above tarball. if you have obtained the source via the command 'git clone', however, do note that line-endings of files in your working directory might differ from line-endings of the respective files in the upstream repository. --- libjava/gnu/awt/j2d/MappedRaster.java | 72 +++++++++++++++++++++++++++++++++++ 1 file changed, 72 insertions(+) create mode 100644 libjava/gnu/awt/j2d/MappedRaster.java (limited to 'libjava/gnu/awt/j2d/MappedRaster.java') diff --git a/libjava/gnu/awt/j2d/MappedRaster.java b/libjava/gnu/awt/j2d/MappedRaster.java new file mode 100644 index 000000000..eb41eecf9 --- /dev/null +++ b/libjava/gnu/awt/j2d/MappedRaster.java @@ -0,0 +1,72 @@ +/* Copyright (C) 2000 Free Software Foundation + + This file is part of libgcj. + +This software is copyrighted work licensed under the terms of the +Libgcj License. Please consult the file "LIBGCJ_LICENSE" for +details. */ + +package gnu.awt.j2d; + +import java.awt.image.WritableRaster; +import java.awt.image.ColorModel; + +/* The raster and associated properties of a mapped screen region. + * The compositing capabilities of backends are often insufficient. + * The backend may not support alpha blending, or may not support some + * other special compositing rule. This means that compositing must + * sometimes be done within the rendering pipeline. The general + * compositing operation consists of combining new color and alpha + * values with existing color values on the drawing surface, to find + * the new color values for the drawing surface. The way the values + * are combined, determines what kind of compositing operation that is + * performed. The default compositing operation is alpha compositing. + * + *

In order to perform alpha compositing and other compositing + * operations, we need access to the color values of the imagery that + * has already been drawn on the drawing surface. The + * DirectRasterGraphics interface must therefore contain methods that + * makes it possible to gain access to the pixel values of the drawing + * surface. The methods are modeled after the POSIX mmap() and + * munmap() functions. But, instead of mapping and unmapping portions + * of data from a file descriptor to memory, the methods in + * DirectRasterGraphics maps and unmaps portions of the drawing + * surface to data arrays within writable raster objects. A call to + * mapRaster() will return a writable raster object, encapsulating the + * image data of the drawing surface in the requested domain. The data + * encapsulated by this raster object can be modified using the + * WritableRaster API, or the data buffers can be retrieved from the + * raster, so that the data arrays can be manipulated directly. When + * the raster image has been modified as desired, the data can be + * resynchronized with the drawing surface by calling mapRaster(). + * + *

As with mmap() and munmap() the methods may work by direct + * manipulation of shared memory, (i.e. the raster object directly + * wraps the actual image data of the drawing surface), or may make a + * private copy that is resynched when the raster is unmapped. The + * backend may choose to implement either mechanism, and the pipeline + * code should not care what mechanism is actually used. This design + * allows us to make full use of speedups such as X shared memory + * extentions when available. + */ +public class MappedRaster +{ + WritableRaster raster; + ColorModel cm; + + public MappedRaster(WritableRaster raster, ColorModel cm) + { + this.raster = raster; + this.cm = cm; + } + + public final WritableRaster getRaster() + { + return raster; + } + + public final ColorModel getColorModel() + { + return cm; + } +} -- cgit v1.2.3