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Diffstat (limited to 'libjava/gnu/gcj/awt/ComponentDataBlitOp.java')
| -rw-r--r-- | libjava/gnu/gcj/awt/ComponentDataBlitOp.java | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/libjava/gnu/gcj/awt/ComponentDataBlitOp.java b/libjava/gnu/gcj/awt/ComponentDataBlitOp.java new file mode 100644 index 00000000000..34861c65f1d --- /dev/null +++ b/libjava/gnu/gcj/awt/ComponentDataBlitOp.java @@ -0,0 +1,123 @@ +/* Copyright © 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.gcj.awt; + +import java.awt.geom.*; +import java.awt.image.*; +import java.awt.RenderingHints; + +/** + * This raster copy operation assumes that both source and destination + * sample models are tightly pixel packed and contain the same number + * of bands. + * + * @throws java.lang.ClassCastException if the sample models of the + * rasters are not of type ComponentSampleModel. + * + * @author Rolf W. Rasmussen <rolfwr@ii.uib.no> + */ +public class ComponentDataBlitOp implements RasterOp +{ + public static ComponentDataBlitOp INSTANCE = new ComponentDataBlitOp(); + + public WritableRaster filter(Raster src, WritableRaster dest) + { + if (dest == null) + dest = createCompatibleDestRaster(src); + + DataBuffer srcDB = src.getDataBuffer(); + DataBuffer destDB = dest.getDataBuffer(); + + ComponentSampleModel srcSM = (ComponentSampleModel) src.getSampleModel(); + ComponentSampleModel destSM = (ComponentSampleModel) dest.getSampleModel(); + + + // Calculate offset to data in the underlying arrays: + + int srcScanlineStride = srcSM.getScanlineStride(); + int destScanlineStride = destSM.getScanlineStride(); + int srcX = src.getMinX() - src.getSampleModelTranslateX(); + int srcY = src.getMinY() - src.getSampleModelTranslateY(); + int destX = dest.getMinX() - dest.getSampleModelTranslateX(); + int destY = dest.getMinY() - dest.getSampleModelTranslateY(); + + int numBands = srcSM.getNumBands(); + + /* We can't use getOffset(x, y) from the sample model since we + don't want the band offset added in. */ + + int srcOffset = + numBands*srcX + srcScanlineStride*srcY + // from sample model + srcDB.getOffset(); // from data buffer + + int destOffset = + numBands*destX + destScanlineStride*destY + // from sample model + destDB.getOffset(); // from data buffer + + // Determine how much, and how many times to blit. + + int rowSize = src.getWidth()*numBands; + int h = src.getHeight(); + + if ((rowSize == srcScanlineStride) && + (rowSize == destScanlineStride)) + { + // collapse scan line blits to one large blit. + rowSize *= h; + h = 1; + } + + + // Do blitting + + Object srcArray = Buffers.getData(srcDB); + Object destArray = Buffers.getData(destDB); + + for (int yd = 0; yd<h; yd++) + { + System.arraycopy(srcArray, srcOffset, + destArray, destOffset, + rowSize); + srcOffset += srcScanlineStride; + destOffset += destScanlineStride; + } + + + return dest; + } + + public Rectangle2D getBounds2D(Raster src) + { + return src.getBounds(); + } + + public WritableRaster createCompatibleDestRaster(Raster src) { + + /* FIXME: Maybe we should explicitly create a raster with a + tightly pixel packed sample model, rather than assuming + that the createCompatibleWritableRaster() method in Raster + will create one. */ + + return src.createCompatibleWritableRaster(); + } + + public Point2D getPoint2D(Point2D srcPoint, Point2D destPoint) + { + if (destPoint == null) + return (Point2D) srcPoint.clone(); + + destPoint.setLocation(srcPoint); + return destPoint; + } + + public RenderingHints getRenderingHints() + { + throw new UnsupportedOperationException("not implemented"); + } +} |

