/** Private method for grabbing a "screenshot" of screen content */
private void drawOffscreenBitmap() {
// Grab global visible rect for later use
// mView.getGlobalVisibleRect(mRectVisibleGlobal);
// Calculate scaled off-screen bitmap width and height
int width = Math.round(mView.getWidth() * BITMAP_SCALE_FACTOR);
int height = Math.round(mView.getHeight() * BITMAP_SCALE_FACTOR);
// Width and height must be > 0
width = Math.max(width, 1);
height = Math.max(height, 1);
// Allocate new off-screen bitmap only when needed
if (mBitmap == null || mBitmap.getWidth() != width || mBitmap.getHeight() != height) {
mBitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
mAllocationBitmap = Allocation.createFromBitmap(mRS, mBitmap);
mAllocationBitmapTmp = Allocation.createFromBitmap(mRS, mBitmap);
mSizeStruct.width = width;
mSizeStruct.height = height;
// Due to adjusting width into multiple of 4 calculate scale matrix
// only here
mMatrixScale.setScale((float) width / mView.getWidth(), (float) height / mView.getHeight());
mMatrixScale.invert(mMatrixScaleInv);
}
// Translate values for off-screen drawing
// int dx = -(Math.min(0, mView.getLeft()) + mRectVisibleGlobal.left);
// int dy = -(Math.min(0, mView.getTop()) + mRectVisibleGlobal.top);
//
// Replaced dx and dy with View.getLocationInWindow() coordinates
// because translate was bad for using BlurLinearLayout and
// BlurRelativeLayout as children for other Views than root View.
mView.getLocationInWindow(mLocationInWindow);
// Restore canvas to its original state
mCanvas.restoreToCount(1);
mCanvas.setBitmap(mBitmap);
// Using scale matrix will make draw call to match
// resized off-screen bitmap size
mCanvas.setMatrix(mMatrixScale);
// Off-screen bitmap does not cover the whole screen
// Use canvas translate to match its position on screen
mCanvas.translate(-mLocationInWindow[0], -mLocationInWindow[1]);
// Clip rect is the same as we have
// TODO: Why does this not work on API 18?
// mCanvas.clipRect(mRectVisibleGlobal);
// Save current canvas state
mCanvas.save();
// Start drawing from the root view
mView.getRootView().draw(mCanvas);
}
private Bitmap BlurImage(Bitmap input, int radius) {
RenderScript rsScript = RenderScript.create(getActivity());
Allocation alloc = Allocation.createFromBitmap(rsScript, input);
ScriptIntrinsicBlur blur = ScriptIntrinsicBlur.create(rsScript, Element.U8_4(rsScript));
blur.setRadius(radius);
blur.setInput(alloc);
Bitmap result = Bitmap.createBitmap(input.getWidth(), input.getHeight(), input.getConfig());
Allocation outAlloc = Allocation.createFromBitmap(rsScript, result);
blur.forEach(outAlloc);
outAlloc.copyTo(result);
rsScript.destroy();
return result;
}
protected boolean prepare() {
final int width = mBlurredView.getWidth();
final int height = mBlurredView.getHeight();
if (mBlurringCanvas == null
|| mDownSampleFactorChanged
|| mBlurredViewWidth != width
|| mBlurredViewHeight != height) {
mDownSampleFactorChanged = false;
mBlurredViewWidth = width;
mBlurredViewHeight = height;
int scaledWidth = width / mDownSampleFactor;
int scaledHeight = height / mDownSampleFactor;
// The following manipulation is to avoid some RenderScript artifacts at the edge.
scaledWidth = scaledWidth - scaledWidth % 4 + 4;
scaledHeight = scaledHeight - scaledHeight % 4 + 4;
if (mBlurredBitmap == null
|| mBlurredBitmap.getWidth() != scaledWidth
|| mBlurredBitmap.getHeight() != scaledHeight) {
mBitmapToBlur = Bitmap.createBitmap(scaledWidth, scaledHeight, Bitmap.Config.ARGB_8888);
if (mBitmapToBlur == null) {
return false;
}
mBlurredBitmap = Bitmap.createBitmap(scaledWidth, scaledHeight, Bitmap.Config.ARGB_8888);
if (mBlurredBitmap == null) {
return false;
}
}
mBlurringCanvas = new Canvas(mBitmapToBlur);
mBlurringCanvas.scale(1f / mDownSampleFactor, 1f / mDownSampleFactor);
mBlurInput =
Allocation.createFromBitmap(
mRenderScript,
mBitmapToBlur,
Allocation.MipmapControl.MIPMAP_NONE,
Allocation.USAGE_SCRIPT);
mBlurOutput = Allocation.createTyped(mRenderScript, mBlurInput.getType());
}
return true;
}
public static Bitmap blendRenderScript(RenderScript rs, Bitmap bitmap1, Bitmap bitmap2) {
if (Build.VERSION.SDK_INT >= 17) {
final Allocation input1 =
Allocation.createFromBitmap(
rs, bitmap1, Allocation.MipmapControl.MIPMAP_NONE, Allocation.USAGE_SCRIPT);
final Allocation input2 =
Allocation.createFromBitmap(
rs, bitmap2, Allocation.MipmapControl.MIPMAP_NONE, Allocation.USAGE_SCRIPT);
final ScriptIntrinsicBlend blendScript = ScriptIntrinsicBlend.create(rs, Element.U8_4(rs));
blendScript.forEachAdd(input1, input2);
input2.copyTo(bitmap1);
return bitmap1;
} else {
throw new IllegalStateException("Renderscript needs sdk >= 17");
}
}
@Override
protected void createFilter(
android.content.res.Resources res, float scaleFactor, int quality, Allocation in) {
RenderScript rsCtx = getRenderScriptContext();
Type.Builder tb_float = new Type.Builder(rsCtx, Element.F32_4(rsCtx));
tb_float.setX(in.getType().getX());
tb_float.setY(in.getType().getY());
mScript = new ScriptC_grad(rsCtx, res, R.raw.grad);
}
private void runSelectiveAdjust(Allocation in, Allocation out) {
int width = in.getType().getX();
int height = in.getType().getY();
LaunchOptions options = new LaunchOptions();
int ty;
options.setX(0, width);
for (ty = 0; ty < height; ty += STRIP_SIZE) {
int endy = ty + STRIP_SIZE;
if (endy > height) {
endy = height;
}
options.setY(ty, endy);
mScript.forEach_selectiveAdjust(in, out, options);
if (checkStop()) {
return;
}
}
}
public static Drawable createBlurredImageFromBitmap(
Bitmap bitmap, Context context, int inSampleSize) {
RenderScript rs = RenderScript.create(context);
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inSampleSize = inSampleSize;
ByteArrayOutputStream stream = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, stream);
byte[] imageInByte = stream.toByteArray();
ByteArrayInputStream bis = new ByteArrayInputStream(imageInByte);
Bitmap blurTemplate = BitmapFactory.decodeStream(bis, null, options);
final android.support.v8.renderscript.Allocation input =
android.support.v8.renderscript.Allocation.createFromBitmap(rs, blurTemplate);
final android.support.v8.renderscript.Allocation output =
android.support.v8.renderscript.Allocation.createTyped(rs, input.getType());
final android.support.v8.renderscript.ScriptIntrinsicBlur script =
android.support.v8.renderscript.ScriptIntrinsicBlur.create(
rs, android.support.v8.renderscript.Element.U8_4(rs));
script.setRadius(8f);
script.setInput(input);
script.forEach(output);
output.copyTo(blurTemplate);
Drawable dr = new BitmapDrawable(blurTemplate);
return dr;
}
/** Set blur radius in screen pixels. Value is mapped in range [1, 254]. */
public void setBlurRadius(int radius) {
// Map radius into scaled down off-screen bitmap size
radius = Math.round(radius * BITMAP_SCALE_FACTOR);
// Setup radius struct
mRadiusStruct.radius = Math.max(1, Math.min(254, radius));
mRadiusStruct.div = mRadiusStruct.radius + mRadiusStruct.radius + 1;
mRadiusStruct.divsum = (mRadiusStruct.div + 1) >> 1;
mRadiusStruct.divsum *= mRadiusStruct.divsum;
// Prepare dv allocation
mAllocationDv = Allocation.createSized(mRS, Element.U8(mRS), 256 * mRadiusStruct.divsum);
mScriptStackBlur.set_initializeDv_divsum(mRadiusStruct.divsum);
mScriptStackBlur.forEach_initializeDv(mAllocationDv);
}
/** Applies blur to current off-screen bitmap */
public void applyBlur() {
// Copy current bitmap into allocation
mAllocationBitmap.copyFrom(mBitmap);
// Set script variables
mScriptStackBlur.bind_dv(mAllocationDv);
mScriptStackBlur.set_bitmap(mAllocationBitmap);
mScriptStackBlur.set_bitmapTmp(mAllocationBitmapTmp);
mScriptStackBlur.set_sizeStruct(mSizeStruct);
mScriptStackBlur.set_radiusStruct(mRadiusStruct);
// On first step iterate over y = [0, mBitmap.getHeight]
mLaunchOptions.setX(0, 1);
mLaunchOptions.setY(0, mBitmap.getHeight());
mScriptStackBlur.forEach_blurHorizontal(mAllocationBitmap, mLaunchOptions);
// On second step iterate over x = [0, mBitmap.getWidth]
mLaunchOptions.setX(0, mBitmap.getWidth());
mLaunchOptions.setY(0, 1);
mScriptStackBlur.forEach_blurVertical(mAllocationBitmap, mLaunchOptions);
// Copy bitmap allocation back to off-screen bitmap
mAllocationBitmap.copyTo(mBitmap);
}
private static void blurRenderScript(Bitmap bitmap, float radius) {
Allocation inAllocation =
Allocation.createFromBitmap(
renderScript, bitmap, Allocation.MipmapControl.MIPMAP_NONE, Allocation.USAGE_SCRIPT);
Allocation outAllocation = Allocation.createTyped(renderScript, inAllocation.getType());
blurShader.setRadius(radius);
blurShader.setInput(inAllocation);
blurShader.forEach(outAllocation);
outAllocation.copyTo(bitmap);
}
public static Bitmap blurBitmap(Bitmap bitmapToBlur, Context context) {
RenderScript rs = RenderScript.create(context);
// use this constructor for best performance, because it uses USAGE_SHARED mode which reuses
// memory
final Allocation input = Allocation.createFromBitmap(rs, bitmapToBlur);
final Allocation output = Allocation.createTyped(rs, input.getType());
final ScriptIntrinsicBlur script = ScriptIntrinsicBlur.create(rs, Element.U8_4(rs));
script.setRadius(16f);
script.setInput(input);
script.forEach(output);
output.copyTo(bitmapToBlur);
return bitmapToBlur;
}
public static Bitmap apply(Context context, Bitmap sentBitmap, int radius) {
final Bitmap bitmap = sentBitmap.copy(sentBitmap.getConfig(), true);
final RenderScript rs = RenderScript.create(context);
final Allocation input =
Allocation.createFromBitmap(
rs, sentBitmap, Allocation.MipmapControl.MIPMAP_NONE, Allocation.USAGE_SCRIPT);
final Allocation output = Allocation.createTyped(rs, input.getType());
final ScriptIntrinsicBlur script = ScriptIntrinsicBlur.create(rs, Element.U8_4(rs));
script.setRadius(radius);
script.setInput(input);
script.forEach(output);
output.copyTo(bitmap);
sentBitmap.recycle();
rs.destroy();
input.destroy();
output.destroy();
script.destroy();
return bitmap;
}
protected void blur() {
mBlurInput.copyFrom(mBitmapToBlur);
mBlurScript.setInput(mBlurInput);
mBlurScript.forEach(mBlurOutput);
mBlurOutput.copyTo(mBlurredBitmap);
}
