| /* |
| * 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; |
| |
| /** |
| * Delegate implementing the native methods of android.graphics.LinearGradient |
| * |
| * Through the layoutlib_create tool, the original native methods of LinearGradient 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 LinearGradient 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 final class LinearGradient_Delegate extends Gradient_Delegate { |
| |
| // ---- delegate data ---- |
| private java.awt.Paint mJavaPaint; |
| |
| // ---- Public Helper methods ---- |
| |
| @Override |
| public java.awt.Paint getJavaPaint() { |
| return mJavaPaint; |
| } |
| |
| // ---- native methods ---- |
| |
| @LayoutlibDelegate |
| /*package*/ static int nativeCreate1(LinearGradient thisGradient, |
| float x0, float y0, float x1, float y1, |
| int colors[], float positions[], int tileMode) { |
| LinearGradient_Delegate newDelegate = new LinearGradient_Delegate(x0, y0, x1, y1, |
| colors, positions, Shader_Delegate.getTileMode(tileMode)); |
| return sManager.addNewDelegate(newDelegate); |
| } |
| |
| @LayoutlibDelegate |
| /*package*/ static int nativeCreate2(LinearGradient thisGradient, |
| float x0, float y0, float x1, float y1, |
| int color0, int color1, int tileMode) { |
| return nativeCreate1(thisGradient, |
| x0, y0, x1, y1, new int[] { color0, color1}, null /*positions*/, |
| tileMode); |
| } |
| |
| @LayoutlibDelegate |
| /*package*/ static int nativePostCreate1(LinearGradient thisGradient, |
| int native_shader, float x0, float y0, float x1, float y1, |
| int colors[], float positions[], int tileMode) { |
| // nothing to be done here. |
| return 0; |
| } |
| |
| @LayoutlibDelegate |
| /*package*/ static int nativePostCreate2(LinearGradient thisGradient, |
| int native_shader, float x0, float y0, float x1, float y1, |
| int color0, int color1, int tileMode) { |
| // nothing to be done here. |
| return 0; |
| } |
| |
| // ---- Private delegate/helper methods ---- |
| |
| /** |
| * Create a shader that draws a linear gradient along a line. |
| * |
| * @param x0 The x-coordinate for the start of the gradient line |
| * @param y0 The y-coordinate for the start of the gradient line |
| * @param x1 The x-coordinate for the end of the gradient line |
| * @param y1 The y-coordinate for the end of the gradient line |
| * @param colors The colors to be distributed along the gradient line |
| * @param positions May be null. The relative positions [0..1] of each |
| * corresponding color in the colors array. If this is null, the |
| * the colors are distributed evenly along the gradient line. |
| * @param tile The Shader tiling mode |
| */ |
| private LinearGradient_Delegate(float x0, float y0, float x1, float y1, |
| int colors[], float positions[], TileMode tile) { |
| super(colors, positions); |
| mJavaPaint = new LinearGradientPaint(x0, y0, x1, y1, mColors, mPositions, tile); |
| } |
| |
| // ---- Custom Java Paint ---- |
| /** |
| * Linear Gradient (Java) Paint able to handle more than 2 points, as |
| * {@link java.awt.GradientPaint} only supports 2 points and does not support Android's tile |
| * modes. |
| */ |
| private class LinearGradientPaint extends GradientPaint { |
| |
| private final float mX0; |
| private final float mY0; |
| private final float mDx; |
| private final float mDy; |
| private final float mDSize2; |
| |
| public LinearGradientPaint(float x0, float y0, float x1, float y1, int colors[], |
| float positions[], TileMode tile) { |
| super(colors, positions, tile); |
| mX0 = x0; |
| mY0 = y0; |
| mDx = x1 - x0; |
| mDy = y1 - y0; |
| mDSize2 = mDx * mDx + mDy * mDy; |
| } |
| |
| @Override |
| public java.awt.PaintContext createContext( |
| java.awt.image.ColorModel colorModel, |
| java.awt.Rectangle deviceBounds, |
| java.awt.geom.Rectangle2D userBounds, |
| java.awt.geom.AffineTransform xform, |
| java.awt.RenderingHints hints) { |
| precomputeGradientColors(); |
| |
| java.awt.geom.AffineTransform canvasMatrix; |
| try { |
| canvasMatrix = xform.createInverse(); |
| } catch (java.awt.geom.NoninvertibleTransformException e) { |
| Bridge.getLog().fidelityWarning(LayoutLog.TAG_MATRIX_INVERSE, |
| "Unable to inverse matrix in LinearGradient", e, null /*data*/); |
| canvasMatrix = new java.awt.geom.AffineTransform(); |
| } |
| |
| java.awt.geom.AffineTransform localMatrix = getLocalMatrix(); |
| try { |
| localMatrix = localMatrix.createInverse(); |
| } catch (java.awt.geom.NoninvertibleTransformException e) { |
| Bridge.getLog().fidelityWarning(LayoutLog.TAG_MATRIX_INVERSE, |
| "Unable to inverse matrix in LinearGradient", e, null /*data*/); |
| localMatrix = new java.awt.geom.AffineTransform(); |
| } |
| |
| return new LinearGradientPaintContext(canvasMatrix, localMatrix, colorModel); |
| } |
| |
| private class LinearGradientPaintContext implements java.awt.PaintContext { |
| |
| private final java.awt.geom.AffineTransform mCanvasMatrix; |
| private final java.awt.geom.AffineTransform mLocalMatrix; |
| private final java.awt.image.ColorModel mColorModel; |
| |
| private LinearGradientPaintContext( |
| java.awt.geom.AffineTransform canvasMatrix, |
| java.awt.geom.AffineTransform localMatrix, |
| java.awt.image.ColorModel colorModel) { |
| mCanvasMatrix = canvasMatrix; |
| mLocalMatrix = localMatrix; |
| mColorModel = colorModel; |
| } |
| |
| @Override |
| public void dispose() { |
| } |
| |
| @Override |
| public java.awt.image.ColorModel getColorModel() { |
| return mColorModel; |
| } |
| |
| @Override |
| public java.awt.image.Raster getRaster(int x, int y, int w, int h) { |
| java.awt.image.BufferedImage image = new java.awt.image.BufferedImage(w, h, |
| java.awt.image.BufferedImage.TYPE_INT_ARGB); |
| |
| 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 x, float y) { |
| float pos; |
| if (mDx == 0) { |
| pos = (y - mY0) / mDy; |
| } else if (mDy == 0) { |
| pos = (x - mX0) / mDx; |
| } else { |
| // find the x position on the gradient vector. |
| float _x = (mDx*mDy*(y-mY0) + mDy*mDy*mX0 + mDx*mDx*x) / mDSize2; |
| // from it get the position relative to the vector |
| pos = (_x - mX0) / mDx; |
| } |
| |
| return getGradientColor(pos); |
| } |
| } |
| } |