68 lines
2.3 KiB
Java
68 lines
2.3 KiB
Java
package net.nullsum.audinaut.util;
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import android.content.Context;
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import android.graphics.Bitmap;
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import android.graphics.Canvas;
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import android.graphics.Color;
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import android.graphics.ColorMatrix;
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import android.graphics.ColorMatrixColorFilter;
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import android.graphics.Paint;
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import android.renderscript.Allocation;
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import android.renderscript.Element;
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import android.renderscript.RenderScript;
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import android.renderscript.ScriptIntrinsicBlur;
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class BlurBuilder {
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private static final float BITMAP_SCALE = 0.4f;
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private static final float BLUR_RADIUS = 25f;
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public static Bitmap blur(Context context, Bitmap image) {
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Bitmap newImage = image;
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for(int i = 0; i<3; i++) {
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newImage = blur_real(context, newImage);
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}
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newImage = changeBitmapContrastBrightness(newImage, 0.5f, 48);
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return newImage;
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}
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private static Bitmap blur_real(Context context, Bitmap image) {
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int width = Math.round(image.getWidth() * BITMAP_SCALE);
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int height = Math.round(image.getHeight() * BITMAP_SCALE);
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Bitmap inputBitmap = Bitmap.createScaledBitmap(image, width, height, false);
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Bitmap outputBitmap = Bitmap.createBitmap(inputBitmap);
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RenderScript rs = RenderScript.create(context);
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ScriptIntrinsicBlur theIntrinsic = ScriptIntrinsicBlur.create(rs, Element.U8_4(rs));
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Allocation tmpIn = Allocation.createFromBitmap(rs, inputBitmap);
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Allocation tmpOut = Allocation.createFromBitmap(rs, outputBitmap);
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theIntrinsic.setRadius(BLUR_RADIUS);
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theIntrinsic.setInput(tmpIn);
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theIntrinsic.forEach(tmpOut);
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tmpOut.copyTo(outputBitmap);
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return outputBitmap;
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}
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public static Bitmap changeBitmapContrastBrightness(Bitmap bmp, float contrast, float brightness)
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{
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ColorMatrix cm = new ColorMatrix(new float[]
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{
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contrast, 0, 0, 0, brightness,
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0, contrast, 0, 0, brightness,
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0, 0, contrast, 0, brightness,
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0, 0, 0, 1, 0
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});
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Bitmap ret = Bitmap.createBitmap(bmp.getWidth(), bmp.getHeight(), bmp.getConfig());
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Canvas canvas = new Canvas(ret);
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Paint paint = new Paint();
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paint.setColorFilter(new ColorMatrixColorFilter(cm));
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canvas.drawBitmap(bmp, 0, 0, paint);
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return ret;
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}
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}
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