content: /*
   * 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;
  
  /**
   * 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(long 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;
          }
          setVar(0, mTables);
      }
  
      /**
       * 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) {
          long id = rs.nScriptIntrinsicCreate(3, e.getID(rs));
          return new ScriptIntrinsicLUT(id, rs);
  
      }
  
      public void destroy() {
          mTables.destroy();
          super.destroy();
      }
  
      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) {
          forEach(ain, aout, null);
      }
  
      /**
       * Invoke the kernel and apply the lookup to each cell of ain
       * and copy to aout.
       *
       * @param ain Input allocation
       * @param aout Output allocation
       * @param opt Options for clipping
       */
      public void forEach(Allocation ain, Allocation aout, Script.LaunchOptions opt) {
          if (mDirty) {
              mDirty = false;
              mTables.copyFromUnchecked(mCache);
          }
          forEach(0, ain, aout, null, opt);
      }
  
      /**
       * Get a KernelID for this intrinsic kernel.
       *
       * @return Script.KernelID The KernelID object.
       */
      public Script.KernelID getKernelID() {
          return createKernelID(0, 3, null, null);
      }
  }
  
  