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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.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.support.v8.renderscript.*;
import android.util.Log;
import android.content.res.Resources;
import com.android.gallery3d.R;
public abstract class ImageFilterRS extends ImageFilter {
private static final String LOGTAG = "ImageFilterRS";
protected static volatile Allocation mInPixelsAllocation;
protected static volatile Allocation mOutPixelsAllocation;
private static volatile RenderScript sRS = null;
private static volatile int sWidth = 0;
private static volatile int sHeight = 0;
private static volatile Resources sResources = null;
private volatile boolean mResourcesLoaded = false;
private static final Bitmap.Config BITMAP_CONFIG = Bitmap.Config.ARGB_8888;
// This must be used inside block synchronized on ImageFilterRS class object
protected void prepare(Bitmap bitmap, float scaleFactor, int quality) {
if (mOutPixelsAllocation == null || mInPixelsAllocation == null ||
bitmap.getWidth() != sWidth || bitmap.getHeight() != sHeight) {
destroyPixelAllocations();
Bitmap bitmapBuffer = bitmap;
if (bitmap.getConfig() == null || bitmap.getConfig() != BITMAP_CONFIG) {
bitmapBuffer = bitmap.copy(BITMAP_CONFIG, true);
}
mOutPixelsAllocation = Allocation.createFromBitmap(sRS, bitmapBuffer,
Allocation.MipmapControl.MIPMAP_NONE, Allocation.USAGE_SCRIPT);
mInPixelsAllocation = Allocation.createTyped(sRS,
mOutPixelsAllocation.getType());
}
mInPixelsAllocation.copyFrom(bitmap);
if (bitmap.getWidth() != sWidth
|| bitmap.getHeight() != sHeight || !isResourcesLoaded()) {
freeResources();
createFilter(sResources, scaleFactor, quality);
sWidth = bitmap.getWidth();
sHeight = bitmap.getHeight();
setResourcesLoaded(true);
}
}
// This must be used inside block synchronized on ImageFilterRS class object
protected abstract void createFilter(android.content.res.Resources res,
float scaleFactor, int quality);
// This must be used inside block synchronized on ImageFilterRS class object
protected abstract void runFilter();
// This must be used inside block synchronized on ImageFilterRS class object
protected void update(Bitmap bitmap) {
mOutPixelsAllocation.copyTo(bitmap);
}
@Override
public Bitmap apply(Bitmap bitmap, float scaleFactor, int quality) {
if (bitmap == null || bitmap.getWidth() == 0 || bitmap.getHeight() == 0) {
return bitmap;
}
try {
synchronized(ImageFilterRS.class) {
if (sRS == null) {
Log.w(LOGTAG, "Cannot apply before calling createRenderScriptContext");
return bitmap;
}
prepare(bitmap, scaleFactor, quality);
runFilter();
update(bitmap);
}
} catch (android.renderscript.RSIllegalArgumentException e) {
Log.e(LOGTAG, "Illegal argument? " + e);
} catch (android.renderscript.RSRuntimeException e) {
Log.e(LOGTAG, "RS runtime exception ? " + e);
} catch (java.lang.OutOfMemoryError e) {
// Many of the renderscript filters allocated large (>16Mb resources) in order to apply.
System.gc();
displayLowMemoryToast();
Log.e(LOGTAG, "not enough memory for filter " + getName(), e);
}
return bitmap;
}
public static synchronized RenderScript getRenderScriptContext() {
return sRS;
}
public static synchronized void createRenderscriptContext(Activity context) {
if( sRS != null) {
Log.w(LOGTAG, "A prior RS context exists when calling setRenderScriptContext");
destroyRenderScriptContext();
}
sRS = RenderScript.create(context);
sResources = context.getResources();
destroyPixelAllocations();
}
private static synchronized void destroyPixelAllocations() {
if (mInPixelsAllocation != null) {
mInPixelsAllocation.destroy();
mInPixelsAllocation = null;
}
if (mOutPixelsAllocation != null) {
mOutPixelsAllocation.destroy();
mOutPixelsAllocation = null;
}
sWidth = 0;
sHeight = 0;
}
public static synchronized void destroyRenderScriptContext() {
destroyPixelAllocations();
sRS.destroy();
sRS = null;
sResources = null;
}
private static synchronized Allocation convertBitmap(Bitmap bitmap) {
return Allocation.createFromBitmap(sRS, bitmap,
Allocation.MipmapControl.MIPMAP_NONE, Allocation.USAGE_SCRIPT);
}
private static synchronized Allocation convertRGBAtoA(Bitmap bitmap) {
Type.Builder tb_a8 = new Type.Builder(sRS, Element.A_8(sRS));
ScriptC_grey greyConvert = new ScriptC_grey(sRS,
sRS.getApplicationContext().getResources(), R.raw.grey);
Allocation bitmapTemp = convertBitmap(bitmap);
if (bitmapTemp.getType().getElement().isCompatible(Element.A_8(sRS))) {
return bitmapTemp;
}
tb_a8.setX(bitmapTemp.getType().getX());
tb_a8.setY(bitmapTemp.getType().getY());
Allocation bitmapAlloc = Allocation.createTyped(sRS, tb_a8.create());
greyConvert.forEach_RGBAtoA(bitmapTemp, bitmapAlloc);
return bitmapAlloc;
}
public Allocation loadResourceAlpha(int resource) {
Resources res = null;
synchronized(ImageFilterRS.class) {
res = sRS.getApplicationContext().getResources();
}
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inPreferredConfig = Bitmap.Config.ALPHA_8;
Bitmap bitmap = BitmapFactory.decodeResource(
res,
resource, options);
Allocation ret = convertRGBAtoA(bitmap);
bitmap.recycle();
return ret;
}
public Allocation loadResource(int resource) {
Resources res = null;
synchronized(ImageFilterRS.class) {
res = sRS.getApplicationContext().getResources();
}
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inPreferredConfig = Bitmap.Config.ARGB_8888;
Bitmap bitmap = BitmapFactory.decodeResource(
res,
resource, options);
Allocation ret = convertBitmap(bitmap);
bitmap.recycle();
return ret;
}
private boolean isResourcesLoaded() {
return mResourcesLoaded;
}
private void setResourcesLoaded(boolean resourcesLoaded) {
mResourcesLoaded = resourcesLoaded;
}
// TODO:
// Ideally, every filter would destroy _every_ renderscript allocation,
// script, and anything else that depends on a certain RS context here.
abstract protected void resetAllocations();
public void freeResources() {
if (!isResourcesLoaded()) {
return;
}
synchronized(ImageFilterRS.class) {
resetAllocations();
setResourcesLoaded(false);
}
}
}
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