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- /*
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements. See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License. You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
- /* $Id$ */
-
- package org.apache.fop.render;
-
- import java.awt.Color;
- import java.awt.Graphics2D;
- import java.awt.Point;
- import java.awt.RenderingHints;
- import java.awt.Transparency;
- import java.awt.color.ColorSpace;
- import java.awt.geom.Rectangle2D;
- import java.awt.image.BufferedImage;
- import java.awt.image.ColorModel;
- import java.awt.image.ComponentColorModel;
- import java.awt.image.DataBuffer;
- import java.awt.image.Raster;
- import java.awt.image.WritableRaster;
- import java.io.IOException;
-
- import org.apache.fop.render.RendererContext.RendererContextWrapper;
- import org.apache.xmlgraphics.util.UnitConv;
-
- /**
- * Abstract base class for Graphics2DAdapter implementations.
- */
- public abstract class AbstractGraphics2DAdapter implements Graphics2DAdapter {
-
- /**
- * Paints the image to a BufferedImage and returns that.
- * @param painter the painter which will paint the actual image
- * @param context the renderer context for the current renderer
- * @param resolution the requested bitmap resolution
- * @param gray true if the generated image should be in grayscales
- * @param withAlpha true if an alpha channel should be created
- * @return the generated BufferedImage
- */
- protected BufferedImage paintToBufferedImage(
- org.apache.xmlgraphics.java2d.Graphics2DImagePainter painter,
- RendererContextWrapper context, int resolution, boolean gray, boolean withAlpha) {
- int bmw = (int)Math.ceil(UnitConv.mpt2px(context.getWidth(), resolution));
- int bmh = (int)Math.ceil(UnitConv.mpt2px(context.getHeight(), resolution));
- BufferedImage bi;
- if (gray) {
- if (withAlpha) {
- bi = createGrayBufferedImageWithAlpha(bmw, bmh);
- } else {
- bi = new BufferedImage(bmw, bmh, BufferedImage.TYPE_BYTE_GRAY);
- }
- } else {
- if (withAlpha) {
- bi = new BufferedImage(bmw, bmh, BufferedImage.TYPE_INT_ARGB);
- } else {
- bi = new BufferedImage(bmw, bmh, BufferedImage.TYPE_INT_RGB);
- }
- }
- Graphics2D g2d = bi.createGraphics();
- try {
- g2d.setRenderingHint(RenderingHints.KEY_FRACTIONALMETRICS,
- RenderingHints.VALUE_FRACTIONALMETRICS_ON);
- setRenderingHintsForBufferedImage(g2d);
-
- g2d.setBackground(Color.white);
- g2d.setColor(Color.black);
- if (!withAlpha) {
- g2d.clearRect(0, 0, bmw, bmh);
- }
- /* debug code
- int off = 2;
- g2d.drawLine(off, 0, off, bmh);
- g2d.drawLine(bmw - off, 0, bmw - off, bmh);
- g2d.drawLine(0, off, bmw, off);
- g2d.drawLine(0, bmh - off, bmw, bmh - off);
- */
- double sx = (double)bmw / context.getWidth();
- double sy = (double)bmh / context.getHeight();
- g2d.scale(sx, sy);
-
- //Paint the image on the BufferedImage
- Rectangle2D area = new Rectangle2D.Double(
- 0.0, 0.0, context.getWidth(), context.getHeight());
- painter.paint(g2d, area);
- } finally {
- g2d.dispose();
- }
- return bi;
- }
-
- private static BufferedImage createGrayBufferedImageWithAlpha(int width, int height) {
- BufferedImage bi;
- boolean alphaPremultiplied = true;
- int bands = 2;
- int[] bits = new int[bands];
- for (int i = 0; i < bands; i++) {
- bits[i] = 8;
- }
- ColorModel cm = new ComponentColorModel(
- ColorSpace.getInstance(ColorSpace.CS_GRAY),
- bits,
- true, alphaPremultiplied,
- Transparency.TRANSLUCENT,
- DataBuffer.TYPE_BYTE);
- WritableRaster wr = Raster.createInterleavedRaster(
- DataBuffer.TYPE_BYTE,
- width, height, bands,
- new Point(0, 0));
- bi = new BufferedImage(cm, wr, alphaPremultiplied, null);
- return bi;
- }
-
- /**
- * Sets rendering hints on the Graphics2D created for painting to a BufferedImage. Subclasses
- * can modify the settings to customize the behaviour.
- * @param g2d the Graphics2D instance
- */
- protected void setRenderingHintsForBufferedImage(Graphics2D g2d) {
- g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
- RenderingHints.VALUE_ANTIALIAS_OFF);
- g2d.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING,
- RenderingHints.VALUE_TEXT_ANTIALIAS_OFF);
- }
-
- /** {@inheritDoc} */
- public void paintImage(Graphics2DImagePainter painter,
- RendererContext context,
- int x, int y, int width, int height) throws IOException {
- paintImage((org.apache.xmlgraphics.java2d.Graphics2DImagePainter)painter,
- context, x, y, width, height);
- }
-
- }
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