Example usage for android.graphics Canvas drawBitmap

Introduction

In this page you can find the example usage for android.graphics Canvas drawBitmap.

Prototype

public void drawBitmap(@NonNull Bitmap bitmap, @Nullable Rect src, @NonNull Rect dst, @Nullable Paint paint)

Source Link

Document

Draw the specified bitmap, scaling/translating automatically to fill the destination rectangle.

Usage

From source file:Main.java

private static Bitmap toGrayscale(Bitmap bmpOriginal) {
    int width, height;
    height = bmpOriginal.getHeight();/*from   ww w  .j a v  a 2 s .  com*/
    width = bmpOriginal.getWidth();

    Bitmap bmpGrayscale = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
    Canvas c = new Canvas(bmpGrayscale);
    Paint paint = new Paint();
    ColorMatrix cm = new ColorMatrix();
    cm.setSaturation(0);

    ColorMatrixColorFilter f = new ColorMatrixColorFilter(cm);
    paint.setColorFilter(f);
    c.drawBitmap(bmpOriginal, 0, 0, paint);
    return bmpGrayscale;
}

From source file:Main.java

public static Bitmap addPadding(Bitmap bmp, int color) {

    if (bmp == null) {
        return null;
    }/*from www . j  a v a  2s .co  m*/

    int biggerParam = Math.max(bmp.getWidth(), bmp.getHeight());
    Bitmap bitmap = Bitmap.createBitmap(biggerParam, biggerParam, bmp.getConfig());
    Canvas canvas = new Canvas(bitmap);
    canvas.drawColor(color);

    int top = bmp.getHeight() > bmp.getWidth() ? 0 : (bmp.getWidth() - bmp.getHeight()) / 2;
    int left = bmp.getWidth() > bmp.getHeight() ? 0 : (bmp.getHeight() - bmp.getWidth()) / 2;

    canvas.drawBitmap(bmp, left, top, null);
    return bitmap;
}

From source file:Main.java

public static Bitmap addPadding(@NonNull Bitmap bmp) {

    int biggerParam = Math.max(bmp.getWidth(), bmp.getHeight());
    Bitmap bitmap = Bitmap.createBitmap(biggerParam, biggerParam, bmp.getConfig());
    Canvas canvas = new Canvas(bitmap);
    canvas.drawColor(Color.WHITE);

    int top = bmp.getHeight() > bmp.getWidth() ? 0 : (bmp.getWidth() - bmp.getHeight()) / 2;
    int left = bmp.getWidth() > bmp.getHeight() ? 0 : (bmp.getHeight() - bmp.getWidth()) / 2;

    canvas.drawBitmap(bmp, left, top, null);
    return bitmap;
}

From source file:Main.java

public static Bitmap toGrayScale(Bitmap bmpOriginal) {
    int width, height;
    height = bmpOriginal.getHeight();//from  w w  w. j  a v a 2 s  .c om
    width = bmpOriginal.getWidth();

    Bitmap bmpGrayscale = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565);
    Canvas c = new Canvas(bmpGrayscale);
    Paint paint = new Paint();
    ColorMatrix cm = new ColorMatrix();
    cm.setSaturation(0);
    ColorMatrixColorFilter f = new ColorMatrixColorFilter(cm);
    paint.setColorFilter(f);
    c.drawBitmap(bmpOriginal, 0, 0, paint);
    return bmpGrayscale;
}

From source file:Main.java

/**
 * Convert bitmap to the grayscale//from   w w  w  . ja v  a 2s  . c o  m
 * http://androidsnippets.com/convert-bitmap-to-grayscale
 *
 * @param bmpOriginal Original bitmap
 * @return Grayscale bitmap
 */
public static Bitmap toGrayscale(Bitmap bmpOriginal) {
    final int height = bmpOriginal.getHeight();
    final int width = bmpOriginal.getWidth();

    final Bitmap bmpGrayscale = Bitmap.createBitmap(width, height, Config.ARGB_8888);
    final Canvas c = new Canvas(bmpGrayscale);
    final Paint paint = new Paint();
    final ColorMatrix cm = new ColorMatrix();
    cm.setSaturation(0);
    final ColorMatrixColorFilter f = new ColorMatrixColorFilter(cm);
    paint.setColorFilter(f);
    c.drawBitmap(bmpOriginal, 0, 0, paint);
    return bmpGrayscale;
}

From source file:Main.java

public static Bitmap toCircleBitmap(Bitmap bitmap) {

    int width = bitmap.getWidth();
    int height = bitmap.getHeight();
    int r = width < height ? width : height;

    Bitmap buffer = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(buffer);
    Paint paint = new Paint();
    paint.setAntiAlias(true);/*w  ww  .java2s  . c o  m*/
    RectF rect = new RectF(0, 0, r, r);

    canvas.drawCircle(r / 2, r / 2, r / 2, paint);
    paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
    canvas.drawBitmap(bitmap, null, rect, paint);
    bitmap.recycle();
    return buffer;
}

From source file:Main.java

public static final Bitmap alpha(Bitmap bitmap, int alpha) {
    float[] matrixItems = new float[] { 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, alpha / 255f, 0,
            0, 0, 0, 0, 1 };// www. ja  v  a2s . c  om
    int width = bitmap.getWidth();
    int height = bitmap.getHeight();
    Bitmap alphaBitmap = Bitmap.createBitmap(width, height, Config.ARGB_8888);
    Canvas canvas = new Canvas(alphaBitmap);
    Paint paint = new Paint();
    ColorMatrix colorMatrix = new ColorMatrix(matrixItems);
    ColorMatrixColorFilter colorMatrixFilter = new ColorMatrixColorFilter(colorMatrix);
    paint.setColorFilter(colorMatrixFilter);
    canvas.drawBitmap(bitmap, 0, 0, paint);
    return alphaBitmap;
}

From source file:Main.java

public static Bitmap joinBitmaps(Bitmap first, Bitmap second) {
    Bitmap result = Bitmap.createBitmap(first.getWidth(), first.getHeight(), Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(result);
    Paint bitmapPaint = new Paint();
    if (second.getWidth() != first.getWidth() && second.getHeight() != first.getHeight()) {
        second = createScaledToFillBitmap(second, first.getWidth(), first.getHeight());
    }//from  w w  w  . j  a  v a  2s .c  o m

    canvas.drawBitmap(first, 0, 0, bitmapPaint);
    canvas.drawBitmap(second, 0, 0, bitmapPaint);

    return result;
}

From source file:Main.java

public static Bitmap toGrayscale(Bitmap bmpOriginal) {
    int width, height;
    height = bmpOriginal.getHeight();//from  w  w  w  .  j  av a 2s .  co  m
    width = bmpOriginal.getWidth();

    Bitmap bmpGrayscale = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565);
    Canvas c = new Canvas(bmpGrayscale);
    Paint paint = new Paint();
    ColorMatrix cm = new ColorMatrix();
    cm.setSaturation(0);
    ColorMatrixColorFilter f = new ColorMatrixColorFilter(cm);
    paint.setColorFilter(f);
    c.drawBitmap(bmpOriginal, 0, 0, paint);
    return bmpGrayscale;
}

From source file:Main.java

public static Bitmap toGrayscale(Bitmap bmpOriginal) {
    int width, height;
    height = bmpOriginal.getHeight();//from   ww  w  . j  a v a 2s  . c om
    width = bmpOriginal.getWidth();
    try {
        Bitmap bmpGrayscale = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
        Canvas c = new Canvas(bmpGrayscale);
        Paint paint = new Paint();
        ColorMatrix cm = new ColorMatrix();
        cm.setSaturation(0);
        ColorMatrixColorFilter f = new ColorMatrixColorFilter(cm);
        paint.setColorFilter(f);
        c.drawBitmap(bmpOriginal, 0, 0, paint);
        return bmpGrayscale;
    } catch (OutOfMemoryError e) {
        return bmpOriginal;
    }
}