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/*
* 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 com.android.gallery3d.filtershow.filters;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.LinearGradient;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.graphics.Shader.TileMode;
public class ImageFilterGradient extends ImageFilter {
private Bitmap mGradientBitmap = null;
private int[] mColors = null;
private float[] mPositions = null;
public ImageFilterGradient() {
mName = "Gradient";
}
@Override
public ImageFilter clone() throws CloneNotSupportedException {
// FIXME: clone() should not be needed. Remove?.
ImageFilterGradient filter = (ImageFilterGradient) super.clone();
System.arraycopy(mColors, 0, filter.mColors, 0, mColors.length);
System.arraycopy(mPositions, 0, filter.mPositions, 0, mPositions.length);
return filter;
}
public void addColor(int color, float position) {
int length = 0;
if (mColors != null) {
length = mColors.length;
}
int[] colors = new int[length + 1];
float[] positions = new float[length + 1];
for (int i = 0; i < length; i++) {
colors[i] = mColors[i];
positions[i] = mPositions[i];
}
colors[length] = color;
positions[length] = position;
mColors = colors;
mPositions = positions;
}
@Override
public Bitmap apply(Bitmap bitmap, float scaleFactor, boolean highQuality) {
createGradient();
int[] gradient = new int[256];
int[] redGradient = new int[256];
int[] greenGradient = new int[256];
int[] blueGradient = new int[256];
mGradientBitmap.getPixels(gradient, 0, 256, 0, 0, 256, 1);
for (int i = 0; i < 256; i++) {
redGradient[i] = Color.red(gradient[i]);
greenGradient[i] = Color.green(gradient[i]);
blueGradient[i] = Color.blue(gradient[i]);
}
nativeApplyGradientFilter(bitmap, bitmap.getWidth(), bitmap.getHeight(),
redGradient, greenGradient, blueGradient);
return bitmap;
}
public void createGradient() {
if (mGradientBitmap != null) {
return;
}
/* Create a 200 x 200 bitmap and fill it with black. */
Bitmap b = Bitmap.createBitmap(256, 1, Config.ARGB_8888);
Canvas c = new Canvas(b);
c.drawColor(Color.BLACK);
/* Create your gradient. */
/*
* int[] colors = new int[2]; colors[0] = Color.argb(255, 20, 20, 10);
* colors[0] = Color.BLACK; colors[1] = Color.argb(255, 228, 231, 193);
* float[] positions = new float[2]; positions[0] = 0; positions[1] = 1;
*/
LinearGradient grad = new LinearGradient(0, 0, 255, 1, mColors,
mPositions, TileMode.CLAMP);
/* Draw your gradient to the top of your bitmap. */
Paint p = new Paint();
p.setStyle(Style.FILL);
p.setShader(grad);
c.drawRect(0, 0, 256, 1, p);
mGradientBitmap = b;
}
}
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