org.sejda.sambox.pdmodel.graphics.blend.BlendMode Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of sambox Show documentation
Show all versions of sambox Show documentation
An Apache PDFBox fork intended to be used as PDF processor for Sejda and PDFsam
related projects
/*
* 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.
*/
package org.sejda.sambox.pdmodel.graphics.blend;
import java.util.HashMap;
import java.util.Map;
import org.sejda.sambox.cos.COSArray;
import org.sejda.sambox.cos.COSBase;
import org.sejda.sambox.cos.COSName;
/**
* Blend mode.
*
* @author Kühn & Weyh Software, GmbH
*/
public abstract class BlendMode
{
public static final SeparableBlendMode NORMAL = new SeparableBlendMode()
{
@Override
public float blendChannel(float srcValue, float dstValue)
{
return srcValue;
}
};
public static final SeparableBlendMode COMPATIBLE = NORMAL;
public static final SeparableBlendMode MULTIPLY = new SeparableBlendMode()
{
@Override
public float blendChannel(float srcValue, float dstValue)
{
return srcValue * dstValue;
}
};
public static final SeparableBlendMode SCREEN = new SeparableBlendMode()
{
@Override
public float blendChannel(float srcValue, float dstValue)
{
return srcValue + dstValue - srcValue * dstValue;
}
};
public static final SeparableBlendMode OVERLAY = new SeparableBlendMode()
{
@Override
public float blendChannel(float srcValue, float dstValue)
{
return (dstValue <= 0.5) ? 2 * dstValue * srcValue
: 2 * (srcValue + dstValue - srcValue * dstValue) - 1;
}
};
public static final SeparableBlendMode DARKEN = new SeparableBlendMode()
{
@Override
public float blendChannel(float srcValue, float dstValue)
{
return Math.min(srcValue, dstValue);
}
};
public static final SeparableBlendMode LIGHTEN = new SeparableBlendMode()
{
@Override
public float blendChannel(float srcValue, float dstValue)
{
return Math.max(srcValue, dstValue);
}
};
public static final SeparableBlendMode COLOR_DODGE = new SeparableBlendMode()
{
@Override
public float blendChannel(float srcValue, float dstValue)
{
// See PDF 2.0 specification
if (dstValue == 0)
{
return 0;
}
if (dstValue >= 1 - srcValue)
{
return 1;
}
return dstValue / (1 - srcValue);
}
};
public static final SeparableBlendMode COLOR_BURN = new SeparableBlendMode()
{
@Override
public float blendChannel(float srcValue, float dstValue)
{
// See PDF 2.0 specification
if (dstValue == 1)
{
return 1;
}
if (1 - dstValue >= srcValue)
{
return 0;
}
return 1 - (1 - dstValue) / srcValue;
}
};
public static final SeparableBlendMode HARD_LIGHT = new SeparableBlendMode()
{
@Override
public float blendChannel(float srcValue, float dstValue)
{
return (srcValue <= 0.5) ? 2 * dstValue * srcValue
: 2 * (srcValue + dstValue - srcValue * dstValue) - 1;
}
};
public static final SeparableBlendMode SOFT_LIGHT = new SeparableBlendMode()
{
@Override
public float blendChannel(float srcValue, float dstValue)
{
if (srcValue <= 0.5)
{
return dstValue - (1 - 2 * srcValue) * dstValue * (1 - dstValue);
}
float d = (dstValue <= 0.25) ? ((16 * dstValue - 12) * dstValue + 4) * dstValue
: (float) Math.sqrt(dstValue);
return dstValue + (2 * srcValue - 1) * (d - dstValue);
}
};
public static final SeparableBlendMode DIFFERENCE = new SeparableBlendMode()
{
@Override
public float blendChannel(float srcValue, float dstValue)
{
return Math.abs(dstValue - srcValue);
}
};
public static final SeparableBlendMode EXCLUSION = new SeparableBlendMode()
{
@Override
public float blendChannel(float srcValue, float dstValue)
{
return dstValue + srcValue - 2 * dstValue * srcValue;
}
};
public static final NonSeparableBlendMode HUE = new NonSeparableBlendMode()
{
@Override
public void blend(float[] srcValues, float[] dstValues, float[] result)
{
float[] temp = new float[3];
getSaturationRGB(dstValues, srcValues, temp);
getLuminosityRGB(dstValues, temp, result);
}
};
public static final NonSeparableBlendMode SATURATION = new NonSeparableBlendMode()
{
@Override
public void blend(float[] srcValues, float[] dstValues, float[] result)
{
getSaturationRGB(srcValues, dstValues, result);
}
};
public static final NonSeparableBlendMode COLOR = new NonSeparableBlendMode()
{
@Override
public void blend(float[] srcValues, float[] dstValues, float[] result)
{
getLuminosityRGB(dstValues, srcValues, result);
}
};
public static final NonSeparableBlendMode LUMINOSITY = new NonSeparableBlendMode()
{
@Override
public void blend(float[] srcValues, float[] dstValues, float[] result)
{
getLuminosityRGB(srcValues, dstValues, result);
}
};
// these maps *must* come after the BlendMode.* constant declarations, otherwise their values would be null
private static final Map BLEND_MODES = createBlendModeMap();
private static final Map BLEND_MODE_NAMES = createBlendModeNamesMap();
BlendMode()
{
}
/**
* Determines the blend mode from the BM entry in the COS ExtGState.
*
* @param cosBlendMode name or array
* @return blending mode
*/
public static BlendMode getInstance(COSBase cosBlendMode)
{
BlendMode result = null;
if (cosBlendMode instanceof COSName)
{
result = BLEND_MODES.get(cosBlendMode);
}
else if (cosBlendMode instanceof COSArray cosBlendModeArray)
{
for (int i = 0; i < cosBlendModeArray.size(); i++)
{
result = BLEND_MODES.get(cosBlendModeArray.getObject(i));
if (result != null)
{
break;
}
}
}
if (result != null)
{
return result;
}
return BlendMode.NORMAL;
}
/**
* Determines the blend mode name from the BM object.
*
* @param bm Blend mode.
* @return name of blend mode.
*/
public static COSName getCOSName(BlendMode bm)
{
return BLEND_MODE_NAMES.get(bm);
}
private static int get255Value(float val)
{
return (int) Math.floor(val >= 1.0 ? 255 : val * 255.0);
}
private static void getSaturationRGB(float[] srcValues, float[] dstValues, float[] result)
{
int minb;
int maxb;
int mins;
int maxs;
int y;
int scale;
int r;
int g;
int b;
int rd = get255Value(dstValues[0]);
int gd = get255Value(dstValues[1]);
int bd = get255Value(dstValues[2]);
int rs = get255Value(srcValues[0]);
int gs = get255Value(srcValues[1]);
int bs = get255Value(srcValues[2]);
minb = Math.min(rd, Math.min(gd, bd));
maxb = Math.max(rd, Math.max(gd, bd));
if (minb == maxb)
{
/* backdrop has zero saturation, avoid divide by 0 */
result[0] = gd / 255.0f;
result[1] = gd / 255.0f;
result[2] = gd / 255.0f;
return;
}
mins = Math.min(rs, Math.min(gs, bs));
maxs = Math.max(rs, Math.max(gs, bs));
scale = ((maxs - mins) << 16) / (maxb - minb);
y = (rd * 77 + gd * 151 + bd * 28 + 0x80) >> 8;
r = y + ((((rd - y) * scale) + 0x8000) >> 16);
g = y + ((((gd - y) * scale) + 0x8000) >> 16);
b = y + ((((bd - y) * scale) + 0x8000) >> 16);
if (((r | g | b) & 0x100) == 0x100)
{
int scalemin;
int scalemax;
int min;
int max;
min = Math.min(r, Math.min(g, b));
max = Math.max(r, Math.max(g, b));
if (min < 0)
{
scalemin = (y << 16) / (y - min);
}
else
{
scalemin = 0x10000;
}
if (max > 255)
{
scalemax = ((255 - y) << 16) / (max - y);
}
else
{
scalemax = 0x10000;
}
scale = Math.min(scalemin, scalemax);
r = y + (((r - y) * scale + 0x8000) >> 16);
g = y + (((g - y) * scale + 0x8000) >> 16);
b = y + (((b - y) * scale + 0x8000) >> 16);
}
result[0] = r / 255.0f;
result[1] = g / 255.0f;
result[2] = b / 255.0f;
}
private static void getLuminosityRGB(float[] srcValues, float[] dstValues, float[] result)
{
int delta;
int scale;
int r;
int g;
int b;
int y;
int rd = get255Value(dstValues[0]);
int gd = get255Value(dstValues[1]);
int bd = get255Value(dstValues[2]);
int rs = get255Value(srcValues[0]);
int gs = get255Value(srcValues[1]);
int bs = get255Value(srcValues[2]);
delta = ((rs - rd) * 77 + (gs - gd) * 151 + (bs - bd) * 28 + 0x80) >> 8;
r = rd + delta;
g = gd + delta;
b = bd + delta;
if (((r | g | b) & 0x100) == 0x100)
{
y = (rs * 77 + gs * 151 + bs * 28 + 0x80) >> 8;
if (delta > 0)
{
int max;
max = Math.max(r, Math.max(g, b));
scale = max == y ? 0 : ((255 - y) << 16) / (max - y);
}
else
{
int min;
min = Math.min(r, Math.min(g, b));
scale = y == min ? 0 : (y << 16) / (y - min);
}
r = y + (((r - y) * scale + 0x8000) >> 16);
g = y + (((g - y) * scale + 0x8000) >> 16);
b = y + (((b - y) * scale + 0x8000) >> 16);
}
result[0] = r / 255.0f;
result[1] = g / 255.0f;
result[2] = b / 255.0f;
}
private static Map createBlendModeMap()
{
Map map = new HashMap<>(13);
map.put(COSName.NORMAL, BlendMode.NORMAL);
// BlendMode.COMPATIBLE should not be used
map.put(COSName.COMPATIBLE, BlendMode.NORMAL);
map.put(COSName.MULTIPLY, BlendMode.MULTIPLY);
map.put(COSName.SCREEN, BlendMode.SCREEN);
map.put(COSName.OVERLAY, BlendMode.OVERLAY);
map.put(COSName.DARKEN, BlendMode.DARKEN);
map.put(COSName.LIGHTEN, BlendMode.LIGHTEN);
map.put(COSName.COLOR_DODGE, BlendMode.COLOR_DODGE);
map.put(COSName.COLOR_BURN, BlendMode.COLOR_BURN);
map.put(COSName.HARD_LIGHT, BlendMode.HARD_LIGHT);
map.put(COSName.SOFT_LIGHT, BlendMode.SOFT_LIGHT);
map.put(COSName.DIFFERENCE, BlendMode.DIFFERENCE);
map.put(COSName.EXCLUSION, BlendMode.EXCLUSION);
map.put(COSName.HUE, BlendMode.HUE);
map.put(COSName.SATURATION, BlendMode.SATURATION);
map.put(COSName.LUMINOSITY, BlendMode.LUMINOSITY);
map.put(COSName.COLOR, BlendMode.COLOR);
return map;
}
private static Map createBlendModeNamesMap()
{
Map map = new HashMap<>(13);
map.put(BlendMode.NORMAL, COSName.NORMAL);
// BlendMode.COMPATIBLE should not be used
map.put(BlendMode.COMPATIBLE, COSName.NORMAL);
map.put(BlendMode.MULTIPLY, COSName.MULTIPLY);
map.put(BlendMode.SCREEN, COSName.SCREEN);
map.put(BlendMode.OVERLAY, COSName.OVERLAY);
map.put(BlendMode.DARKEN, COSName.DARKEN);
map.put(BlendMode.LIGHTEN, COSName.LIGHTEN);
map.put(BlendMode.COLOR_DODGE, COSName.COLOR_DODGE);
map.put(BlendMode.COLOR_BURN, COSName.COLOR_BURN);
map.put(BlendMode.HARD_LIGHT, COSName.HARD_LIGHT);
map.put(BlendMode.SOFT_LIGHT, COSName.SOFT_LIGHT);
map.put(BlendMode.DIFFERENCE, COSName.DIFFERENCE);
map.put(BlendMode.EXCLUSION, COSName.EXCLUSION);
map.put(BlendMode.HUE, COSName.HUE);
map.put(BlendMode.SATURATION, COSName.SATURATION);
map.put(BlendMode.LUMINOSITY, COSName.LUMINOSITY);
map.put(BlendMode.COLOR, COSName.COLOR);
return map;
}
}