/*
* 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.Raster;
/**
* 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(Bitmap androidBitmap, int shaderTileModeX,
int shaderTileModeY) {
Bitmap_Delegate bitmap = Bitmap_Delegate.getDelegate(androidBitmap);
if (bitmap == null) {
return 0;
}
BitmapShader_Delegate newDelegate = new BitmapShader_Delegate(
bitmap.getImage(),
Shader_Delegate.getTileMode(shaderTileModeX),
Shader_Delegate.getTileMode(shaderTileModeY));
return sManager.addNewDelegate(newDelegate);
}
// ---- Private delegate/helper methods ----
private BitmapShader_Delegate(BufferedImage image,
TileMode tileModeX, TileMode tileModeY) {
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]);
}
}
image.setRGB(0 /*startX*/, 0 /*startY*/, w, h, data, 0 /*offset*/, w /*scansize*/);
return image.getRaster();
}
}
/**
* 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;
}
}
}