content: /*
   * Copyright (C) 2010 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.graphics;
  
  import com.android.ide.common.rendering.api.LayoutLog;
  import com.android.layoutlib.bridge.Bridge;
  import com.android.layoutlib.bridge.impl.DelegateManager;
  import com.android.tools.layoutlib.annotations.LayoutlibDelegate;
  
  import android.graphics.Shader.TileMode;
  
  import java.awt.PaintContext;
  import java.awt.Rectangle;
  import java.awt.RenderingHints;
  import java.awt.geom.AffineTransform;
  import java.awt.geom.NoninvertibleTransformException;
  import java.awt.geom.Rectangle2D;
  import java.awt.image.BufferedImage;
  import java.awt.image.ColorModel;
  import java.awt.image.DataBufferInt;
  import java.awt.image.Raster;
  import java.awt.image.SampleModel;
  
  /**
   * Delegate implementing the native methods of android.graphics.BitmapShader
   *
   * Through the layoutlib_create tool, the original native methods of BitmapShader have been
   * replaced by calls to methods of the same name in this delegate class.
   *
   * This class behaves like the original native implementation, but in Java, keeping previously
   * native data into its own objects and mapping them to int that are sent back and forth between
   * it and the original BitmapShader class.
   *
   * Because this extends {@link Shader_Delegate}, there's no need to use a {@link DelegateManager},
   * as all the Shader classes will be added to the manager owned by {@link Shader_Delegate}.
   *
   * @see Shader_Delegate
   *
   */
  public class BitmapShader_Delegate extends Shader_Delegate {
  
      // ---- delegate data ----
      private java.awt.Paint mJavaPaint;
  
      // ---- Public Helper methods ----
  
      @Override
      public java.awt.Paint getJavaPaint() {
          return mJavaPaint;
      }
  
      @Override
      public boolean isSupported() {
          return true;
      }
  
      @Override
      public String getSupportMessage() {
          // no message since isSupported returns true;
          return null;
      }
  
      // ---- native methods ----
  
      @LayoutlibDelegate
      /*package*/ static long nativeCreate(long nativeMatrix, long bitmapHandle,
              int shaderTileModeX, int shaderTileModeY) {
          Bitmap_Delegate bitmap = Bitmap_Delegate.getDelegate(bitmapHandle);
          if (bitmap == null) {
              return 0;
          }
  
          BitmapShader_Delegate newDelegate = new BitmapShader_Delegate(nativeMatrix,
                  bitmap.getImage(),
                  Shader_Delegate.getTileMode(shaderTileModeX),
                  Shader_Delegate.getTileMode(shaderTileModeY));
          return sManager.addNewDelegate(newDelegate);
      }
  
      // ---- Private delegate/helper methods ----
  
      private BitmapShader_Delegate(long matrix, BufferedImage image,
              TileMode tileModeX, TileMode tileModeY) {
          super(matrix);
          mJavaPaint = new BitmapShaderPaint(image, tileModeX, tileModeY);
      }
  
      private class BitmapShaderPaint implements java.awt.Paint {
          private final BufferedImage mImage;
          private final TileMode mTileModeX;
          private final TileMode mTileModeY;
  
          BitmapShaderPaint(BufferedImage image,
                  TileMode tileModeX, TileMode tileModeY) {
              mImage = image;
              mTileModeX = tileModeX;
              mTileModeY = tileModeY;
          }
  
          @Override
          public PaintContext createContext(ColorModel colorModel, Rectangle deviceBounds,
                  Rectangle2D userBounds, AffineTransform xform, RenderingHints hints) {
              AffineTransform canvasMatrix;
              try {
                  canvasMatrix = xform.createInverse();
              } catch (NoninvertibleTransformException e) {
                  Bridge.getLog().fidelityWarning(LayoutLog.TAG_MATRIX_INVERSE,
                          "Unable to inverse matrix in BitmapShader", e, null /*data*/);
                  canvasMatrix = new AffineTransform();
              }
  
              AffineTransform localMatrix = getLocalMatrix();
              try {
                  localMatrix = localMatrix.createInverse();
              } catch (NoninvertibleTransformException e) {
                  Bridge.getLog().fidelityWarning(LayoutLog.TAG_MATRIX_INVERSE,
                          "Unable to inverse matrix in BitmapShader", e, null /*data*/);
                  localMatrix = new AffineTransform();
              }
  
              if (!colorModel.isCompatibleRaster(mImage.getRaster())) {
                  // Fallback to the default ARGB color model
                  colorModel = ColorModel.getRGBdefault();
              }
  
              return new BitmapShaderContext(canvasMatrix, localMatrix, colorModel);
          }
  
          private class BitmapShaderContext implements PaintContext {
  
              private final AffineTransform mCanvasMatrix;
              private final AffineTransform mLocalMatrix;
              private final ColorModel mColorModel;
  
              public BitmapShaderContext(
                      AffineTransform canvasMatrix,
                      AffineTransform localMatrix,
                      ColorModel colorModel) {
                  mCanvasMatrix = canvasMatrix;
                  mLocalMatrix = localMatrix;
                  mColorModel = colorModel;
              }
  
              @Override
              public void dispose() {
              }
  
              @Override
              public ColorModel getColorModel() {
                  return mColorModel;
              }
  
              @Override
              public Raster getRaster(int x, int y, int w, int h) {
                  BufferedImage image = new BufferedImage(
                      mColorModel, mColorModel.createCompatibleWritableRaster(w, h),
                      mColorModel.isAlphaPremultiplied(), null);
  
                  int[] data = new int[w*h];
  
                  int index = 0;
                  float[] pt1 = new float[2];
                  float[] pt2 = new float[2];
                  for (int iy = 0 ; iy < h ; iy++) {
                      for (int ix = 0 ; ix < w ; ix++) {
                          // handle the canvas transform
                          pt1[0] = x + ix;
                          pt1[1] = y + iy;
                          mCanvasMatrix.transform(pt1, 0, pt2, 0, 1);
  
                          // handle the local matrix.
                          pt1[0] = pt2[0];
                          pt1[1] = pt2[1];
                          mLocalMatrix.transform(pt1, 0, pt2, 0, 1);
  
                          data[index++] = getColor(pt2[0], pt2[1]);
                      }
                  }
  
                  DataBufferInt dataBuffer = new DataBufferInt(data, data.length);
                  SampleModel colorModel = mColorModel.createCompatibleSampleModel(w, h);
                  return Raster.createWritableRaster(colorModel, dataBuffer, null);
              }
          }
  
          /**
           * Returns a color for an arbitrary point.
           */
          private int getColor(float fx, float fy) {
              int x = getCoordinate(Math.round(fx), mImage.getWidth(), mTileModeX);
              int y = getCoordinate(Math.round(fy), mImage.getHeight(), mTileModeY);
  
              return mImage.getRGB(x, y);
          }
  
          private int getCoordinate(int i, int size, TileMode mode) {
              if (i < 0) {
                  switch (mode) {
                      case CLAMP:
                          i = 0;
                          break;
                      case REPEAT:
                          i = size - 1 - (-i % size);
                          break;
                      case MIRROR:
                          // this is the same as the positive side, just make the value positive
                          // first.
                          i = -i;
                          int count = i / size;
                          i = i % size;
  
                          if ((count % 2) == 1) {
                              i = size - 1 - i;
                          }
                          break;
                  }
              } else if (i >= size) {
                  switch (mode) {
                      case CLAMP:
                          i = size - 1;
                          break;
                      case REPEAT:
                          i = i % size;
                          break;
                      case MIRROR:
                          int count = i / size;
                          i = i % size;
  
                          if ((count % 2) == 1) {
                              i = size - 1 - i;
                          }
                          break;
                  }
              }
  
              return i;
          }
  
  
          @Override
          public int getTransparency() {
              return java.awt.Paint.TRANSLUCENT;
          }
      }
  }
  