/*
* #%L
* ACS AEM Commons Bundle
* %%
* Copyright (C) 2013 Adobe
* %%
* Licensed 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.
* #L%
*/
package com.adobe.acs.commons.images.transformers.impl;
import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import org.apache.felix.scr.annotations.Component;
import org.apache.felix.scr.annotations.Properties;
import org.apache.felix.scr.annotations.Property;
import org.apache.felix.scr.annotations.Service;
import org.apache.sling.api.resource.ValueMap;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.adobe.acs.commons.images.ImageTransformer;
import com.adobe.acs.commons.images.transformers.impl.composites.MultiplyBlendComposite;
import com.day.image.Layer;
//@formatter:off
@Component(
label = "ACS AEM Commons - Image Transformer - Multiply Color Blend"
)
@Properties({
@Property(
name = ImageTransformer.PROP_TYPE,
value = MultiplyBlendImageTransformerImpl.TYPE,
propertyPrivate = true
)
})
@Service
//@formatter:on
public class MultiplyBlendImageTransformerImpl implements ImageTransformer {
private static final Logger log = LoggerFactory.getLogger(MultiplyBlendImageTransformerImpl.class);
static final String TYPE = "multiply";
private static final String KEY_ALPHA = "alpha";
private static final String KEY_ALPHA_ALIAS = "a";
private static final String KEY_COLOR = "color";
private static final String KEY_COLOR_ALIAS = "c";
private static final String KEY_RED = "red";
private static final String KEY_RED_ALIAS = "r";
private static final String KEY_GREEN = "green";
private static final String KEY_GREEN_ALIAS = "g";
private static final String KEY_BLUE = "blue";
private static final String KEY_BLUE_ALIAS = "b";
private static final int DEFAULT_COLOR_VALUE = 255;
@Override
public final Layer transform(final Layer layer, final ValueMap properties) {
if (properties == null || properties.isEmpty()) {
log.warn("Transform [ {} ] requires parameters.", TYPE);
return layer;
}
log.debug("Transforming with [ {} ]", TYPE);
float alpha = normalizeAlpha(properties.get(KEY_ALPHA, properties.get(KEY_ALPHA_ALIAS, 0.0)).floatValue());
Color color = getColor(properties);
Layer filter = new Layer(layer.getWidth(), layer.getHeight(), color);
BufferedImage image = merge(layer.getImage(), filter.getImage(), alpha);
Layer result = new Layer(image);
return result;
}
private BufferedImage merge(final BufferedImage original, final BufferedImage colorBlend, float alpha) {
BufferedImage image = new BufferedImage(original.getWidth(), original.getHeight(), BufferedImage.TYPE_INT_ARGB);
// Create the background
Graphics2D graphics = image.createGraphics();
graphics.setComposite(AlphaComposite.Clear);
graphics.fillRect(0, 0, original.getWidth(), original.getHeight());
// Add the original image
graphics.setComposite(AlphaComposite.Src);
graphics.drawImage(original, 0, 0, null);
// Merge in the color filter
graphics.setComposite(new MultiplyBlendComposite(alpha));
graphics.drawImage(colorBlend, 0, 0, null);
graphics.dispose();
return image;
}
private Color getColor(final ValueMap properties) {
Color color = getHexColor(properties);
if (color == null) {
color = getRGBColor(properties);
}
return color;
}
private Color getHexColor(final ValueMap properties) {
String hexcolor = properties.get(KEY_COLOR, properties.get(KEY_COLOR_ALIAS, String.class));
Color color = null;
if (hexcolor != null) {
try {
color = Color.decode("0x" + hexcolor);
} catch (NumberFormatException ex) {
log.warn("Invalid hex color specified: {}", hexcolor);
}
}
return color;
}
private Color getRGBColor(final ValueMap properties) {
Color color;
int red = normalizeRGB(properties.get(KEY_RED, properties.get(KEY_RED_ALIAS, DEFAULT_COLOR_VALUE)));
int green = normalizeRGB(properties.get(KEY_GREEN, properties.get(KEY_GREEN_ALIAS, DEFAULT_COLOR_VALUE)));
int blue = normalizeRGB(properties.get(KEY_BLUE, properties.get(KEY_BLUE_ALIAS, DEFAULT_COLOR_VALUE)));
color = new Color(red, green, blue);
return color;
}
private float normalizeAlpha(float alpha) {
if (alpha > 1) {
alpha = 1f;
} else if (alpha < 0) {
alpha = 0f;
}
return alpha;
}
private int normalizeRGB(int rgbValue) {
if (rgbValue > DEFAULT_COLOR_VALUE) {
rgbValue = DEFAULT_COLOR_VALUE;
} else if (rgbValue < 0) {
rgbValue = 0;
}
return rgbValue;
}
}