Java Code Examples for android.graphics.Bitmap#extractAlpha()

private void setFairyImage() {
    boolean glow_available = fairy_glow_on && getBooleanPreferences(getApplicationContext(), PREF_KCA_NOTI_QUEST_FAIRY_GLOW);
    Bitmap src = KcaUtils.getFairyImageFromStorage(getApplicationContext(), viewBitmapId, dbHelper);
    Bitmap alpha = src.extractAlpha();
    Bitmap bmp = Bitmap.createBitmap(src.getWidth() + margin,
            src.getHeight() + margin, Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(bmp);
    if (glow_available) {
        Paint glow_paint = new Paint();
        glow_paint.setColor(glowColor);
        glow_paint.setMaskFilter(new BlurMaskFilter(glowRadius, BlurMaskFilter.Blur.OUTER));
        canvas.drawBitmap(alpha, halfMargin, halfMargin, glow_paint);
    }
    Paint color_paint = new Paint();
    if (taiha_status) {
        color_paint.setColorFilter(new PorterDuffColorFilter(ContextCompat.getColor(getApplicationContext(),
                R.color.colorHeavyDmgStateWarn), PorterDuff.Mode.MULTIPLY));
    } else if (glow_available) {
        color_paint.setColorFilter(new PorterDuffColorFilter(glowColor2, PorterDuff.Mode.MULTIPLY));
    }
    canvas.drawBitmap(src, halfMargin, halfMargin, color_paint);
    viewbutton.setImageBitmap(bmp);
}
 

public synchronized Bitmap recreateIcon(Bitmap icon) {
    int[] offset = new int[2];
    Bitmap shadow = icon.extractAlpha(mBlurPaint, offset);
    Bitmap result = Bitmap.createBitmap(mIconSize, mIconSize, Config.ARGB_8888);
    mCanvas.setBitmap(result);

    // Draw ambient shadow
    mDrawPaint.setAlpha(AMBIENT_SHADOW_ALPHA);
    mCanvas.drawBitmap(shadow, offset[0], offset[1], mDrawPaint);

    // Draw key shadow
    mDrawPaint.setAlpha(KEY_SHADOW_ALPHA);
    mCanvas.drawBitmap(shadow, offset[0], offset[1] + KEY_SHADOW_DISTANCE * mIconSize, mDrawPaint);

    // Draw the icon
    mDrawPaint.setAlpha(255);
    mCanvas.drawBitmap(icon, 0, 0, mDrawPaint);

    mCanvas.setBitmap(null);
    return result;
}
 

/**
 *图片阴影
 * @param originalBitmap
 */
public static Drawable drawImageDropShadow(Bitmap originalBitmap, Context context) {

    BlurMaskFilter blurFilter = new BlurMaskFilter(3,BlurMaskFilter.Blur.NORMAL);
    Paint shadowPaint = new Paint();
    shadowPaint.setAlpha(80);
    shadowPaint.setColor(context.getResources().getColor(R.color.black));
    shadowPaint.setMaskFilter(blurFilter);
    int[] offsetXY = new int[2];
    Bitmap shadowBitmap = originalBitmap.extractAlpha(shadowPaint, offsetXY);
    Bitmap shadowImage32 = shadowBitmap.copy(Bitmap.Config.ARGB_8888, true);
    if ( !shadowImage32.isPremultiplied() )
    {
        shadowImage32.setPremultiplied( true );
    }
    Canvas c = new Canvas(shadowImage32);
    c.drawBitmap(originalBitmap, offsetXY[0], offsetXY[1], null);
    return new BitmapDrawable(shadowImage32);
}
 

/**
 * 可以对该图的非透明区域着色
 * <p>
 * 有多种使用场景，常见如 Button 的 pressed 状态，View 的阴影状态等
 *
 * @param iv
 * @param src
 * @param radius
 * @param color
 * @return
 */
private static Bitmap getDropShadow(ImageView iv, Bitmap src, float radius, int color) {

    final Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
    paint.setColor(color);

    final int width = src.getWidth(), height = src.getHeight();
    final Bitmap dest = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
    final Canvas canvas = new Canvas(dest);
    final Bitmap alpha = src.extractAlpha();
    canvas.drawBitmap(alpha, 0, 0, paint);

    final BlurMaskFilter filter = new BlurMaskFilter(radius, BlurMaskFilter.Blur.OUTER);
    paint.setMaskFilter(filter);
    canvas.drawBitmap(alpha, 0, 0, paint);
    iv.setImageBitmap(dest);

    return dest;
}
 

/**
 * 　为指定图片增加阴影
 *
 * @param map    　图片
 * @param radius 　阴影的半径
 * @return
 */
public static Bitmap drawShadow(Bitmap map, int radius) {
    if (map == null)
        return null;

    BlurMaskFilter blurFilter = new BlurMaskFilter(radius, BlurMaskFilter.Blur.OUTER);
    Paint shadowPaint = new Paint();
    shadowPaint.setMaskFilter(blurFilter);

    int[] offsetXY = new int[2];
    Bitmap shadowImage = map.extractAlpha(shadowPaint, offsetXY);
    shadowImage = shadowImage.copy(Config.ARGB_8888, true);
    Canvas c = new Canvas(shadowImage);
    c.drawBitmap(map, -offsetXY[0], -offsetXY[1], null);
    return shadowImage;
}
 

public static Bitmap getAlphaBitmap(Bitmap mBitmap, int mColor) {
//          BitmapDrawable mBitmapDrawable = (BitmapDrawable) mContext.getResources().getDrawable(R.drawable.enemy_infantry_ninja);
//          Bitmap mBitmap = mBitmapDrawable.getBitmap();

        //BitmapDrawable的getIntrinsicWidth（）方法，Bitmap的getWidth（）方法
        //注意这两个方法的区别
        //Bitmap mAlphaBitmap = Bitmap.createBitmap(mBitmapDrawable.getIntrinsicWidth(), mBitmapDrawable.getIntrinsicHeight(), Config.ARGB_8888);
        Bitmap mAlphaBitmap = Bitmap.createBitmap(mBitmap.getWidth(), mBitmap.getHeight(), Bitmap.Config.ARGB_8888);

        Canvas mCanvas = new Canvas(mAlphaBitmap);
        Paint mPaint = new Paint();

        mPaint.setColor(mColor);
        //从原位图中提取只包含alpha的位图
        Bitmap alphaBitmap = mBitmap.extractAlpha();
        //在画布上（mAlphaBitmap）绘制alpha位图
        mCanvas.drawBitmap(alphaBitmap, 0, 0, mPaint);

        return mAlphaBitmap;
    }
 

private void setFairyImage() {
    boolean glow_available = fairy_glow_on && getBooleanPreferences(getApplicationContext(), PREF_KCA_NOTI_QUEST_FAIRY_GLOW);
    Bitmap src = KcaUtils.getFairyImageFromStorage(getApplicationContext(), viewBitmapId, dbHelper);
    Bitmap alpha = src.extractAlpha();
    Bitmap bmp = Bitmap.createBitmap(src.getWidth() + margin,
            src.getHeight() + margin, Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(bmp);
    if (glow_available) {
        Paint glow_paint = new Paint();
        glow_paint.setColor(glowColor);
        glow_paint.setMaskFilter(new BlurMaskFilter(glowRadius, BlurMaskFilter.Blur.OUTER));
        canvas.drawBitmap(alpha, halfMargin, halfMargin, glow_paint);
    }
    Paint color_paint = new Paint();
    if (taiha_status) {
        color_paint.setColorFilter(new PorterDuffColorFilter(ContextCompat.getColor(getApplicationContext(),
                R.color.colorHeavyDmgStateWarn), PorterDuff.Mode.MULTIPLY));
    } else if (glow_available) {
        color_paint.setColorFilter(new PorterDuffColorFilter(glowColor2, PorterDuff.Mode.MULTIPLY));
    }
    canvas.drawBitmap(src, halfMargin, halfMargin, color_paint);
    viewbutton.setImageBitmap(bmp);
}
 

void drawOutline(Canvas dest, Bitmap src) {
    final int[] xy = mTmpXY;
    Bitmap mask = src.extractAlpha(mBlurPaint, xy);
    mMaskCanvas.setBitmap(mask);
    mMaskCanvas.drawBitmap(src, -xy[0], -xy[1], mErasePaint);
    dest.drawColor(0, PorterDuff.Mode.CLEAR);
    dest.setMatrix(mIdentityMatrix);
    dest.drawBitmap(mask, xy[0], xy[1], mHolographicPaint);
    mMaskCanvas.setBitmap(null);
    mask.recycle();
}
 

private static Bitmap getAlphaImage(Bitmap image) throws IOException
{
    if (!image.hasAlpha())
    {
        return null;
    }
    return image.extractAlpha();
}
 

Bitmap createMediumDropShadow(BubbleTextView view) {
    Drawable icon = view.getIcon();
    if (icon == null) {
        return null;
    }
    Rect rect = icon.getBounds();

    int bitmapWidth = (int) (rect.width() * view.getScaleX());
    int bitmapHeight = (int) (rect.height() * view.getScaleY());

    if (bitmapWidth == 0 || bitmapHeight == 0) {
        return null;
    }

    int key = (bitmapWidth << 16) | bitmapHeight;
    Bitmap cache = mBitmapCache.get(key);
    if (cache == null) {
        cache = Bitmap.createBitmap(bitmapWidth, bitmapHeight, Bitmap.Config.ARGB_8888);
        mCanvas.setBitmap(cache);
        mBitmapCache.put(key, cache);
    } else {
        mCanvas.setBitmap(cache);
        mCanvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR);
    }

    mCanvas.save(Canvas.MATRIX_SAVE_FLAG);
    mCanvas.scale(view.getScaleX(), view.getScaleY());
    mCanvas.translate(-rect.left, -rect.top);
    icon.draw(mCanvas);
    mCanvas.restore();
    mCanvas.setBitmap(null);

    mBlurPaint.setMaskFilter(mShadowBlurMaskFilter);
    return cache.extractAlpha(mBlurPaint, null);
}
 

public static Bitmap toAlpha(final Bitmap src, final Boolean recycle) {
    if (isEmptyBitmap(src)) return null;
    Bitmap ret = src.extractAlpha();
    if (recycle && !src.isRecycled()) src.recycle();
    return ret;
}
 

Bitmap createMediumDropShadow(BubbleTextView view) {
    final Bitmap result = Bitmap.createBitmap(
            view.getWidth() + shadowBitmapPadding + shadowBitmapPadding,
            view.getHeight() + shadowBitmapPadding + shadowBitmapPadding + mShadowOffset,
            Bitmap.Config.ARGB_8888);

    mCanvas.setBitmap(result);

    final Rect clipRect = sTempRect;
    view.getDrawingRect(sTempRect);
    // adjust the clip rect so that we don't include the text label
    clipRect.bottom = view.getExtendedPaddingTop() - (int) BubbleTextView.PADDING_V
            + view.getLayout().getLineTop(0);

    // Draw the View into the bitmap.
    // The translate of scrollX and scrollY is necessary when drawing TextViews, because
    // they set scrollX and scrollY to large values to achieve centered text
    mCanvas.save();
    mCanvas.scale(view.getScaleX(), view.getScaleY(),
            view.getWidth() / 2 + shadowBitmapPadding,
            view.getHeight() / 2 + shadowBitmapPadding);
    mCanvas.translate(-view.getScrollX() + shadowBitmapPadding,
            -view.getScrollY() + shadowBitmapPadding);
    mCanvas.clipRect(clipRect, Op.REPLACE);
    view.draw(mCanvas);
    mCanvas.restore();

    int[] blurOffst = new int[2];
    mBlurPaint.setMaskFilter(mShaowBlurMaskFilter);
    Bitmap blurBitmap = result.extractAlpha(mBlurPaint, blurOffst);

    mCanvas.save();
    mCanvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR);
    mCanvas.translate(blurOffst[0], blurOffst[1]);

    mDrawPaint.setColor(Color.BLACK);
    mDrawPaint.setAlpha(30);
    mCanvas.drawBitmap(blurBitmap, 0, 0, mDrawPaint);

    mDrawPaint.setAlpha(60);
    mCanvas.drawBitmap(blurBitmap, 0, mShadowOffset, mDrawPaint);
    mCanvas.restore();

    mCanvas.setBitmap(null);
    blurBitmap.recycle();

    return result;
}
 

void applyExpensiveOutlineWithBlur(Bitmap srcDst, Canvas srcDstCanvas, int color,
        int outlineColor, boolean clipAlpha) {

    // We start by removing most of the alpha channel so as to ignore shadows, and
    // other types of partial transparency when defining the shape of the object
    if (clipAlpha) {
        int[] srcBuffer = new int[srcDst.getWidth() * srcDst.getHeight()];
        srcDst.getPixels(srcBuffer,
                0, srcDst.getWidth(), 0, 0, srcDst.getWidth(), srcDst.getHeight());
        for (int i = 0; i < srcBuffer.length; i++) {
            final int alpha = srcBuffer[i] >>> 24;
            if (alpha < 188) {
                srcBuffer[i] = 0;
            }
        }
        srcDst.setPixels(srcBuffer,
                0, srcDst.getWidth(), 0, 0, srcDst.getWidth(), srcDst.getHeight());
    }
    Bitmap glowShape = srcDst.extractAlpha();

    // calculate the outer blur first
    mBlurPaint.setMaskFilter(mMediumOuterBlurMaskFilter);
    int[] outerBlurOffset = new int[2];
    Bitmap thickOuterBlur = glowShape.extractAlpha(mBlurPaint, outerBlurOffset);

    mBlurPaint.setMaskFilter(mThinOuterBlurMaskFilter);
    int[] brightOutlineOffset = new int[2];
    Bitmap brightOutline = glowShape.extractAlpha(mBlurPaint, brightOutlineOffset);

    // calculate the inner blur
    srcDstCanvas.setBitmap(glowShape);
    srcDstCanvas.drawColor(0xFF000000, PorterDuff.Mode.SRC_OUT);
    mBlurPaint.setMaskFilter(mMediumInnerBlurMaskFilter);
    int[] thickInnerBlurOffset = new int[2];
    Bitmap thickInnerBlur = glowShape.extractAlpha(mBlurPaint, thickInnerBlurOffset);

    // mask out the inner blur
    srcDstCanvas.setBitmap(thickInnerBlur);
    srcDstCanvas.drawBitmap(glowShape, -thickInnerBlurOffset[0],
            -thickInnerBlurOffset[1], mErasePaint);
    srcDstCanvas.drawRect(0, 0, -thickInnerBlurOffset[0], thickInnerBlur.getHeight(),
            mErasePaint);
    srcDstCanvas.drawRect(0, 0, thickInnerBlur.getWidth(), -thickInnerBlurOffset[1],
            mErasePaint);

    // draw the inner and outer blur
    srcDstCanvas.setBitmap(srcDst);
    srcDstCanvas.drawColor(0, PorterDuff.Mode.CLEAR);
    mDrawPaint.setColor(color);
    srcDstCanvas.drawBitmap(thickInnerBlur, thickInnerBlurOffset[0], thickInnerBlurOffset[1],
            mDrawPaint);
    srcDstCanvas.drawBitmap(thickOuterBlur, outerBlurOffset[0], outerBlurOffset[1],
            mDrawPaint);

    // draw the bright outline
    mDrawPaint.setColor(outlineColor);
    srcDstCanvas.drawBitmap(brightOutline, brightOutlineOffset[0], brightOutlineOffset[1],
            mDrawPaint);

    // cleanup
    srcDstCanvas.setBitmap(null);
    brightOutline.recycle();
    thickOuterBlur.recycle();
    thickInnerBlur.recycle();
    glowShape.recycle();
}
 

void applyExpensiveOutlineWithBlur(Bitmap srcDst, Canvas srcDstCanvas, int color,
        int outlineColor, boolean clipAlpha) {

    // We start by removing most of the alpha channel so as to ignore shadows, and
    // other types of partial transparency when defining the shape of the object
    if (clipAlpha) {
        int[] srcBuffer = new int[srcDst.getWidth() * srcDst.getHeight()];
        srcDst.getPixels(srcBuffer,
                0, srcDst.getWidth(), 0, 0, srcDst.getWidth(), srcDst.getHeight());
        for (int i = 0; i < srcBuffer.length; i++) {
            final int alpha = srcBuffer[i] >>> 24;
            if (alpha < 188) {
                srcBuffer[i] = 0;
            }
        }
        srcDst.setPixels(srcBuffer,
                0, srcDst.getWidth(), 0, 0, srcDst.getWidth(), srcDst.getHeight());
    }
    Bitmap glowShape = srcDst.extractAlpha();

    // calculate the outer blur first
    mBlurPaint.setMaskFilter(mMediumOuterBlurMaskFilter);
    int[] outerBlurOffset = new int[2];
    Bitmap thickOuterBlur = glowShape.extractAlpha(mBlurPaint, outerBlurOffset);

    mBlurPaint.setMaskFilter(mThinOuterBlurMaskFilter);
    int[] brightOutlineOffset = new int[2];
    Bitmap brightOutline = glowShape.extractAlpha(mBlurPaint, brightOutlineOffset);

    // calculate the inner blur
    srcDstCanvas.setBitmap(glowShape);
    srcDstCanvas.drawColor(0xFF000000, PorterDuff.Mode.SRC_OUT);
    mBlurPaint.setMaskFilter(mMediumInnerBlurMaskFilter);
    int[] thickInnerBlurOffset = new int[2];
    Bitmap thickInnerBlur = glowShape.extractAlpha(mBlurPaint, thickInnerBlurOffset);

    // mask out the inner blur
    srcDstCanvas.setBitmap(thickInnerBlur);
    srcDstCanvas.drawBitmap(glowShape, -thickInnerBlurOffset[0],
            -thickInnerBlurOffset[1], mErasePaint);
    srcDstCanvas.drawRect(0, 0, -thickInnerBlurOffset[0], thickInnerBlur.getHeight(),
            mErasePaint);
    srcDstCanvas.drawRect(0, 0, thickInnerBlur.getWidth(), -thickInnerBlurOffset[1],
            mErasePaint);

    // draw the inner and outer blur
    srcDstCanvas.setBitmap(srcDst);
    srcDstCanvas.drawColor(0, PorterDuff.Mode.CLEAR);
    mDrawPaint.setColor(color);
    srcDstCanvas.drawBitmap(thickInnerBlur, thickInnerBlurOffset[0], thickInnerBlurOffset[1],
            mDrawPaint);
    srcDstCanvas.drawBitmap(thickOuterBlur, outerBlurOffset[0], outerBlurOffset[1],
            mDrawPaint);

    // draw the bright outline
    mDrawPaint.setColor(outlineColor);
    srcDstCanvas.drawBitmap(brightOutline, brightOutlineOffset[0], brightOutlineOffset[1],
            mDrawPaint);

    // cleanup
    srcDstCanvas.setBitmap(null);
    brightOutline.recycle();
    thickOuterBlur.recycle();
    thickInnerBlur.recycle();
    glowShape.recycle();
}
 

/**
 * Applies a more expensive and accurate outline to whatever is currently drawn in a specified
 * bitmap.
 */
public void applyExpensiveOutlineWithBlur(Bitmap srcDst, Canvas srcDstCanvas) {

    // We start by removing most of the alpha channel so as to ignore shadows, and
    // other types of partial transparency when defining the shape of the object
    byte[] pixels = new byte[srcDst.getWidth() * srcDst.getHeight()];
    ByteBuffer buffer = ByteBuffer.wrap(pixels);
    buffer.rewind();
    srcDst.copyPixelsToBuffer(buffer);

    for (int i = 0; i < pixels.length; i++) {
        if ((pixels[i] & 0xFF) < 188) {
            pixels[i] = 0;
        }
    }

    buffer.rewind();
    srcDst.copyPixelsFromBuffer(buffer);

    // calculate the outer blur first
    mBlurPaint.setMaskFilter(mMediumOuterBlurMaskFilter);
    int[] outerBlurOffset = new int[2];
    Bitmap thickOuterBlur = srcDst.extractAlpha(mBlurPaint, outerBlurOffset);

    mBlurPaint.setMaskFilter(mThinOuterBlurMaskFilter);
    int[] brightOutlineOffset = new int[2];
    Bitmap brightOutline = srcDst.extractAlpha(mBlurPaint, brightOutlineOffset);

    // calculate the inner blur
    srcDstCanvas.setBitmap(srcDst);
    srcDstCanvas.drawColor(0xFF000000, PorterDuff.Mode.SRC_OUT);
    mBlurPaint.setMaskFilter(mMediumInnerBlurMaskFilter);
    int[] thickInnerBlurOffset = new int[2];
    Bitmap thickInnerBlur = srcDst.extractAlpha(mBlurPaint, thickInnerBlurOffset);

    // mask out the inner blur
    srcDstCanvas.setBitmap(thickInnerBlur);
    srcDstCanvas.drawBitmap(srcDst, -thickInnerBlurOffset[0],
            -thickInnerBlurOffset[1], mErasePaint);
    srcDstCanvas.drawRect(0, 0, -thickInnerBlurOffset[0], thickInnerBlur.getHeight(),
            mErasePaint);
    srcDstCanvas.drawRect(0, 0, thickInnerBlur.getWidth(), -thickInnerBlurOffset[1],
            mErasePaint);

    // draw the inner and outer blur
    srcDstCanvas.setBitmap(srcDst);
    srcDstCanvas.drawColor(0, PorterDuff.Mode.CLEAR);
    srcDstCanvas.drawBitmap(thickInnerBlur, thickInnerBlurOffset[0], thickInnerBlurOffset[1],
            mDrawPaint);
    srcDstCanvas.drawBitmap(thickOuterBlur, outerBlurOffset[0], outerBlurOffset[1],
            mDrawPaint);

    // draw the bright outline
    srcDstCanvas.drawBitmap(brightOutline, brightOutlineOffset[0], brightOutlineOffset[1],
            mDrawPaint);

    // cleanup
    srcDstCanvas.setBitmap(null);
    brightOutline.recycle();
    thickOuterBlur.recycle();
    thickInnerBlur.recycle();
}
 

/**
 * Return the alpha bitmap.
 *
 * @param src     The source of bitmap.
 * @param recycle True to recycle the source of bitmap, false otherwise.
 * @return the alpha bitmap
 */
public static Bitmap toAlpha(final Bitmap src, final Boolean recycle) {
    if (isEmptyBitmap(src)) return null;
    Bitmap ret = src.extractAlpha();
    if (recycle && !src.isRecycled() && ret != src) src.recycle();
    return ret;
}
 

/**
 * 转为alpha位图
 *
 * @param src     源图片
 * @param recycle 是否回收
 * @return alpha位图
 */
public static Bitmap toAlpha(Bitmap src, Boolean recycle) {
    if (isEmptyBitmap(src)) return null;
    Bitmap ret = src.extractAlpha();
    if (recycle && !src.isRecycled()) src.recycle();
    return ret;
}
 

/**
 * 转为alpha位图
 *
 * @param src     源图片
 * @param recycle 是否回收
 * @return alpha位图
 */
public static Bitmap toAlpha(Bitmap src, Boolean recycle) {
    if (isEmptyBitmap(src)) return null;
    Bitmap ret = src.extractAlpha();
    if (recycle && !src.isRecycled()) src.recycle();
    return ret;
}
 

/**
 * 转为 alpha 位图
 *
 * @param src     源图片
 * @param recycle 是否回收
 * @return alpha 位图
 */
public static Bitmap toAlpha(@NonNull Bitmap src, Boolean recycle) {
    Bitmap ret = src.extractAlpha();
    if (recycle && !src.isRecycled()) src.recycle();
    return ret;
}
 

/**
 * 获取 Alpha 位图 ( 获取源图片的轮廓 rgb 为 0)
 * @param bitmap {@link Bitmap}
 * @return Alpha 位图
 */
public static Bitmap extractAlpha(final Bitmap bitmap) {
    if (isEmpty(bitmap)) return null;
    return bitmap.extractAlpha();
}