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Use indexed palette for duo tone pattern 

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1873516 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Andreas Beeker 2020-02-03 00:25:52 +00:00
parent 33fd0b22d6
commit 8803989321
1 changed files with 29 additions and 14 deletions
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43
src/java/org/apache/poi/sl/draw/DrawPaint.java
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@ -25,7 +25,6 @@ import java.awt.LinearGradientPaint;
import java.awt.MultipleGradientPaint.ColorSpaceType;
import java.awt.MultipleGradientPaint.CycleMethod;
import java.awt.Paint;
import java.awt.Point;
import java.awt.RadialGradientPaint;
import java.awt.Shape;
import java.awt.geom.AffineTransform;
@ -33,9 +32,8 @@ import java.awt.geom.Dimension2D;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.awt.image.DataBufferInt;
import java.awt.image.DirectColorModel;
import java.awt.image.Raster;
import java.awt.image.DataBuffer;
import java.awt.image.IndexColorModel;
import java.awt.image.WritableRaster;
import java.io.IOException;
import java.io.InputStream;
@ -350,25 +348,42 @@ public class DrawPaint {
* @return the original image if no duotone was found, otherwise the colorized pattern
*/
private static BufferedImage colorizePattern(TexturePaint fill, BufferedImage pattern) {
List<ColorStyle> duoTone = fill.getDuoTone();
final List<ColorStyle> duoTone = fill.getDuoTone();
if (duoTone == null || duoTone.size() != 2) {
return pattern;
}
// the pattern image is actually a gray scale image, so we simply take the first color component
// as an index into our gradient samples
int blendShades = 1 << pattern.getSampleModel().getSampleSize(0);
int[] gradSample = linearBlendedColors(duoTone, blendShades);
int[] redSample = pattern.getRaster().getSamples(0, 0, pattern.getWidth(), pattern.getHeight(), 0, (int[])null);
final int redBits = pattern.getSampleModel().getSampleSize(0);
final int blendBits = Math.max(Math.min(redBits, 8), 1);
final int blendShades = 1 << blendBits;
// Currently ImageIO converts 16-bit images to 8-bit internally, so it's unlikely to get a blendRatio != 1
final double blendRatio = blendShades / (double)(1 << Math.max(redBits,1));
final int[] gradSample = linearBlendedColors(duoTone, blendShades);
for (int i=0; i<redSample.length; i++) {
redSample[i] = gradSample[redSample[i] & 0xFF];
final IndexColorModel icm = new IndexColorModel(blendBits, blendShades, gradSample, 0, true, -1, DataBuffer.TYPE_BYTE);
final BufferedImage patIdx = new BufferedImage(pattern.getWidth(), pattern.getHeight(), BufferedImage.TYPE_BYTE_INDEXED, icm);
final WritableRaster rasterRGBA = pattern.getRaster();
final WritableRaster rasterIdx = patIdx.getRaster();
final int[] redSample = new int[pattern.getWidth()];
for (int y=0; y<pattern.getHeight(); y++) {
rasterRGBA.getSamples(0, y, redSample.length, 1, 0, redSample);
scaleShades(redSample, blendRatio);
rasterIdx.setSamples(0, y, redSample.length, 1, 0, redSample);
}
DirectColorModel dcm = new DirectColorModel(32, 0x00FF0000, 0x0000FF00, 0x000000FF, 0xFF000000);
DataBufferInt dbi = new DataBufferInt(redSample, redSample.length);
WritableRaster raster = Raster.createPackedRaster(dbi, pattern.getWidth(), pattern.getHeight(), pattern.getWidth(), new int[]{0x00FF0000, 0x0000FF00, 0x000000FF, 0xFF000000}, new Point());
return new BufferedImage(dcm, raster, true, null);
return patIdx;
}
private static void scaleShades(int[] samples, double ratio) {
if (ratio != 1) {
for (int x=0; x<samples.length; x++) {
samples[x] = (int)Math.rint(samples[x] * ratio);
}
}
}
private static int[] linearBlendedColors(List<ColorStyle> duoTone, final int blendShades) {