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/*
* Copyright (C) 2013 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;
/**
* Intrinsic Histogram filter.
*
*
**/
public final class ScriptIntrinsicHistogram extends ScriptIntrinsic {
private Allocation mOut;
private ScriptIntrinsicHistogram(long id, RenderScript rs) {
super(id, rs);
}
/**
* Create an intrinsic for calculating the histogram of an uchar
* or uchar4 image.
*
* Supported elements types are
* {@link Element#U8_4}, {@link Element#U8_3},
* {@link Element#U8_2}, {@link Element#U8}
*
* @param rs The RenderScript context
* @param e Element type for inputs
*
* @return ScriptIntrinsicHistogram
*/
public static ScriptIntrinsicHistogram create(RenderScript rs, Element e) {
if ((!e.isCompatible(Element.U8_4(rs))) &&
(!e.isCompatible(Element.U8_3(rs))) &&
(!e.isCompatible(Element.U8_2(rs))) &&
(!e.isCompatible(Element.U8(rs)))) {
throw new RSIllegalArgumentException("Unsuported element type.");
}
long id = rs.nScriptIntrinsicCreate(9, e.getID(rs));
ScriptIntrinsicHistogram sib = new ScriptIntrinsicHistogram(id, rs);
return sib;
}
/**
* Process an input buffer and place the histogram into the
* output allocation. The output allocation may be a narrower
* vector size than the input. In this case the vector size of
* the output is used to determine how many of the input
* channels are used in the computation. This is useful if you
* have an RGBA input buffer but only want the histogram for
* RGB.
*
* 1D and 2D input allocations are supported.
*
* @param ain The input image
*/
public void forEach(Allocation ain) {
forEach(ain, null);
}
/**
* Process an input buffer and place the histogram into the
* output allocation. The output allocation may be a narrower
* vector size than the input. In this case the vector size of
* the output is used to determine how many of the input
* channels are used in the computation. This is useful if you
* have an RGBA input buffer but only want the histogram for
* RGB.
*
* 1D and 2D input allocations are supported.
*
* @param ain The input image
* @param opt LaunchOptions for clipping
*/
public void forEach(Allocation ain, Script.LaunchOptions opt) {
if (ain.getType().getElement().getVectorSize() <
mOut.getType().getElement().getVectorSize()) {
throw new RSIllegalArgumentException(
"Input vector size must be >= output vector size.");
}
if (!ain.getType().getElement().isCompatible(Element.U8(mRS)) &&
!ain.getType().getElement().isCompatible(Element.U8_2(mRS)) &&
!ain.getType().getElement().isCompatible(Element.U8_3(mRS)) &&
!ain.getType().getElement().isCompatible(Element.U8_4(mRS))) {
throw new RSIllegalArgumentException("Input type must be U8, U8_1, U8_2 or U8_4.");
}
forEach(0, ain, null, null, opt);
}
/**
* Set the coefficients used for the RGBA to Luminocity
* calculation. The default is {0.299f, 0.587f, 0.114f, 0.f}.
*
* Coefficients must be >= 0 and sum to 1.0 or less.
*
* @param r Red coefficient
* @param g Green coefficient
* @param b Blue coefficient
* @param a Alpha coefficient
*/
public void setDotCoefficients(float r, float g, float b, float a) {
if ((r < 0.f) || (g < 0.f) || (b < 0.f) || (a < 0.f)) {
throw new RSIllegalArgumentException("Coefficient may not be negative.");
}
if ((r + g + b + a) > 1.f) {
throw new RSIllegalArgumentException("Sum of coefficients must be 1.0 or less.");
}
FieldPacker fp = new FieldPacker(16);
fp.addF32(r);
fp.addF32(g);
fp.addF32(b);
fp.addF32(a);
setVar(0, fp);
}
/**
* Set the output of the histogram. 32 bit integer types are
* supported.
*
* @param aout The output allocation
*/
public void setOutput(Allocation aout) {
mOut = aout;
if (mOut.getType().getElement() != Element.U32(mRS) &&
mOut.getType().getElement() != Element.U32_2(mRS) &&
mOut.getType().getElement() != Element.U32_3(mRS) &&
mOut.getType().getElement() != Element.U32_4(mRS) &&
mOut.getType().getElement() != Element.I32(mRS) &&
mOut.getType().getElement() != Element.I32_2(mRS) &&
mOut.getType().getElement() != Element.I32_3(mRS) &&
mOut.getType().getElement() != Element.I32_4(mRS)) {
throw new RSIllegalArgumentException("Output type must be U32 or I32.");
}
if ((mOut.getType().getX() != 256) ||
(mOut.getType().getY() != 0) ||
mOut.getType().hasMipmaps() ||
(mOut.getType().getYuv() != 0)) {
throw new RSIllegalArgumentException("Output must be 1D, 256 elements.");
}
setVar(1, aout);
}
/**
* Process an input buffer and place the histogram into the
* output allocation. The dot product of the input channel and
* the coefficients from 'setDotCoefficients' are used to
* calculate the output values.
*
* 1D and 2D input allocations are supported.
*
* @param ain The input image
*/
public void forEach_Dot(Allocation ain) {
forEach_Dot(ain, null);
}
/**
* Process an input buffer and place the histogram into the
* output allocation. The dot product of the input channel and
* the coefficients from 'setDotCoefficients' are used to
* calculate the output values.
*
* 1D and 2D input allocations are supported.
*
* @param ain The input image
* @param opt LaunchOptions for clipping
*/
public void forEach_Dot(Allocation ain, Script.LaunchOptions opt) {
if (mOut.getType().getElement().getVectorSize() != 1) {
throw new RSIllegalArgumentException("Output vector size must be one.");
}
if (!ain.getType().getElement().isCompatible(Element.U8(mRS)) &&
!ain.getType().getElement().isCompatible(Element.U8_2(mRS)) &&
!ain.getType().getElement().isCompatible(Element.U8_3(mRS)) &&
!ain.getType().getElement().isCompatible(Element.U8_4(mRS))) {
throw new RSIllegalArgumentException("Input type must be U8, U8_1, U8_2 or U8_4.");
}
forEach(1, ain, null, null, opt);
}
/**
* Get a KernelID for this intrinsic kernel.
*
* @return Script.KernelID The KernelID object.
*/
public Script.KernelID getKernelID_Separate() {
return createKernelID(0, 3, null, null);
}
/**
* Get a FieldID for the input field of this intrinsic.
*
* @return Script.FieldID The FieldID object.
*/
public Script.FieldID getFieldID_Input() {
return createFieldID(1, null);
}
}
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