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/*
* Copyright (C) 2012 The Android Open Source Project
*
* 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.
*/
package android.renderscript;
import android.content.Context;
import android.content.res.Resources;
import android.util.Log;
/**
* Intrinsic for applying a per-channel lookup table. Each
* channel of the input has an independant lookup table. The
* tables are 256 entries in size and can cover the full value
* range of {@link Element#U8_4}.
**/
public final class ScriptIntrinsicLUT extends ScriptIntrinsic {
private final Matrix4f mMatrix = new Matrix4f();
private Allocation mTables;
private final byte mCache[] = new byte[1024];
private boolean mDirty = true;
private ScriptIntrinsicLUT(int id, RenderScript rs) {
super(id, rs);
mTables = Allocation.createSized(rs, Element.U8(rs), 1024);
for (int ct=0; ct < 256; ct++) {
mCache[ct] = (byte)ct;
mCache[ct + 256] = (byte)ct;
mCache[ct + 512] = (byte)ct;
mCache[ct + 768] = (byte)ct;
}
bindAllocation(mTables, 0);
}
/**
* Supported elements types are {@link Element#U8_4}
*
* The defaults tables are identity.
*
* @param rs The Renderscript context
* @param e Element type for intputs and outputs
*
* @return ScriptIntrinsicLUT
*/
public static ScriptIntrinsicLUT create(RenderScript rs, Element e) {
int id = rs.nScriptIntrinsicCreate(3, e.getID(rs));
return new ScriptIntrinsicLUT(id, rs);
}
private void validate(int index, int value) {
if (index < 0 || index > 255) {
throw new RSIllegalArgumentException("Index out of range (0-255).");
}
if (value < 0 || value > 255) {
throw new RSIllegalArgumentException("Value out of range (0-255).");
}
}
/**
* Set an entry in the red channel lookup table
*
* @param index Must be 0-255
* @param value Must be 0-255
*/
public void setRed(int index, int value) {
validate(index, value);
mCache[index] = (byte)value;
mDirty = true;
}
/**
* Set an entry in the green channel lookup table
*
* @param index Must be 0-255
* @param value Must be 0-255
*/
public void setGreen(int index, int value) {
validate(index, value);
mCache[index+256] = (byte)value;
mDirty = true;
}
/**
* Set an entry in the blue channel lookup table
*
* @param index Must be 0-255
* @param value Must be 0-255
*/
public void setBlue(int index, int value) {
validate(index, value);
mCache[index+512] = (byte)value;
mDirty = true;
}
/**
* Set an entry in the alpha channel lookup table
*
* @param index Must be 0-255
* @param value Must be 0-255
*/
public void setAlpha(int index, int value) {
validate(index, value);
mCache[index+768] = (byte)value;
mDirty = true;
}
/**
* Invoke the kernel and apply the lookup to each cell of ain
* and copy to aout.
*
* @param ain Input allocation
* @param aout Output allocation
*/
public void forEach(Allocation ain, Allocation aout) {
if (mDirty) {
mDirty = false;
mTables.copyFromUnchecked(mCache);
}
forEach(0, ain, aout, null);
}
}
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