Example usage for android.graphics Canvas setBitmap

Introduction

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

Prototype

public void setBitmap(@Nullable Bitmap bitmap) 

Source Link

Document

Specify a bitmap for the canvas to draw into.

Usage

From source file:Main.java

/**
 * Creates a mutable bitmap from subset of source bitmap, transformed by the optional matrix.
 *///from ww w.j a  v  a  2  s  .  c  o  m
private static Bitmap createBitmap(Bitmap source, int x, int y, int width, int height, Matrix m) {
    // Re-implement Bitmap createBitmap() to always return a mutable bitmap.
    Canvas canvas = new Canvas();

    Bitmap bitmap;
    Paint paint;
    if ((m == null) || m.isIdentity()) {
        bitmap = Bitmap.createBitmap(width, height, source.getConfig());
        paint = null;
    } else {
        RectF rect = new RectF(0, 0, width, height);
        m.mapRect(rect);
        bitmap = Bitmap.createBitmap(Math.round(rect.width()), Math.round(rect.height()), source.getConfig());

        canvas.translate(-rect.left, -rect.top);
        canvas.concat(m);

        paint = new Paint(Paint.FILTER_BITMAP_FLAG);
        if (!m.rectStaysRect()) {
            paint.setAntiAlias(true);
        }
    }
    bitmap.setDensity(source.getDensity());
    canvas.setBitmap(bitmap);

    Rect srcBounds = new Rect(x, y, x + width, y + height);
    RectF dstBounds = new RectF(0, 0, width, height);
    canvas.drawBitmap(source, srcBounds, dstBounds, paint);
    return bitmap;
}

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From source file:Main.java

/**
 * Transform source Bitmap to targeted width and height.
 *//*from   w w  w.ja v  a 2  s. c  o  m*/
private static Bitmap transform(Matrix scaler, Bitmap source, int targetWidth, int targetHeight, int options) {
    boolean scaleUp = (options & OPTIONS_SCALE_UP) != 0;
    boolean recycle = (options & OPTIONS_RECYCLE_INPUT) != 0;

    int deltaX = source.getWidth() - targetWidth;
    int deltaY = source.getHeight() - targetHeight;
    if (!scaleUp && (deltaX < 0 || deltaY < 0)) {
        /*
         * In this case the bitmap is smaller, at least in one dimension,
         * than the target.  Transform it by placing as much of the image
         * as possible into the target and leaving the top/bottom or
         * left/right (or both) black.
         */
        Bitmap b2 = Bitmap.createBitmap(targetWidth, targetHeight, Bitmap.Config.ARGB_8888);
        Canvas c = new Canvas(b2);

        int deltaXHalf = Math.max(0, deltaX / 2);
        int deltaYHalf = Math.max(0, deltaY / 2);
        Rect src = new Rect(deltaXHalf, deltaYHalf, deltaXHalf + Math.min(targetWidth, source.getWidth()),
                deltaYHalf + Math.min(targetHeight, source.getHeight()));
        int dstX = (targetWidth - src.width()) / 2;
        int dstY = (targetHeight - src.height()) / 2;
        Rect dst = new Rect(dstX, dstY, targetWidth - dstX, targetHeight - dstY);
        c.drawBitmap(source, src, dst, null);
        if (recycle) {
            source.recycle();
        }
        c.setBitmap(null);
        return b2;
    }
    float bitmapWidthF = source.getWidth();
    float bitmapHeightF = source.getHeight();

    float bitmapAspect = bitmapWidthF / bitmapHeightF;
    float viewAspect = (float) targetWidth / targetHeight;

    if (bitmapAspect > viewAspect) {
        float scale = targetHeight / bitmapHeightF;
        if (scale < .9F || scale > 1F) {
            scaler.setScale(scale, scale);
        } else {
            scaler = null;
        }
    } else {
        float scale = targetWidth / bitmapWidthF;
        if (scale < .9F || scale > 1F) {
            scaler.setScale(scale, scale);
        } else {
            scaler = null;
        }
    }

    Bitmap b1;
    if (scaler != null) {
        // this is used for minithumb and crop, so we want to filter here.
        b1 = Bitmap.createBitmap(source, 0, 0, source.getWidth(), source.getHeight(), scaler, true);
    } else {
        b1 = source;
    }

    if (recycle && b1 != source) {
        source.recycle();
    }

    int dx1 = Math.max(0, b1.getWidth() - targetWidth);
    int dy1 = Math.max(0, b1.getHeight() - targetHeight);

    Bitmap b2 = Bitmap.createBitmap(b1, dx1 / 2, 0, targetWidth, targetHeight);

    if (b2 != b1) {
        if (recycle || b1 != source) {
            b1.recycle();
        }
    }

    return b2;
}

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From source file:Main.java

/**
 * Transform source Bitmap to targeted width and height.
 *//*  www  . j a v  a 2  s . co m*/
private static Bitmap transform(Matrix scaler, Bitmap source, int targetWidth, int targetHeight, int options) {
    boolean scaleUp = (options & OPTIONS_SCALE_UP) != 0;
    boolean recycle = (options & OPTIONS_RECYCLE_INPUT) != 0;

    int deltaX = source.getWidth() - targetWidth;
    int deltaY = source.getHeight() - targetHeight;
    if (!scaleUp && (deltaX < 0 || deltaY < 0)) {
        /*
         * In this case the bitmap is smaller, at least in one dimension,
         * than the target. Transform it by placing as much of the image as
         * possible into the target and leaving the top/bottom or left/right
         * (or both) black.
         */
        Bitmap b2 = Bitmap.createBitmap(targetWidth, targetHeight, Bitmap.Config.ARGB_8888);
        Canvas c = new Canvas(b2);

        int deltaXHalf = Math.max(0, deltaX / 2);
        int deltaYHalf = Math.max(0, deltaY / 2);
        Rect src = new Rect(deltaXHalf, deltaYHalf, deltaXHalf + Math.min(targetWidth, source.getWidth()),
                deltaYHalf + Math.min(targetHeight, source.getHeight()));
        int dstX = (targetWidth - src.width()) / 2;
        int dstY = (targetHeight - src.height()) / 2;
        Rect dst = new Rect(dstX, dstY, targetWidth - dstX, targetHeight - dstY);
        c.drawBitmap(source, src, dst, null);
        if (recycle) {
            source.recycle();
        }
        c.setBitmap(null);
        return b2;
    }
    float bitmapWidthF = source.getWidth();
    float bitmapHeightF = source.getHeight();

    float bitmapAspect = bitmapWidthF / bitmapHeightF;
    float viewAspect = (float) targetWidth / targetHeight;

    if (bitmapAspect > viewAspect) {
        float scale = targetHeight / bitmapHeightF;
        if (scale < .9F || scale > 1F) {
            scaler.setScale(scale, scale);
        } else {
            scaler = null;
        }
    } else {
        float scale = targetWidth / bitmapWidthF;
        if (scale < .9F || scale > 1F) {
            scaler.setScale(scale, scale);
        } else {
            scaler = null;
        }
    }

    Bitmap b1;
    if (scaler != null) {
        // this is used for minithumb and crop, so we want to filter here.
        b1 = Bitmap.createBitmap(source, 0, 0, source.getWidth(), source.getHeight(), scaler, true);
    } else {
        b1 = source;
    }

    if (recycle && b1 != source) {
        source.recycle();
    }

    int dx1 = Math.max(0, b1.getWidth() - targetWidth);
    int dy1 = Math.max(0, b1.getHeight() - targetHeight);

    Bitmap b2 = Bitmap.createBitmap(b1, dx1 / 2, dy1 / 2, targetWidth, targetHeight);

    if (b2 != b1) {
        if (recycle || b1 != source) {
            b1.recycle();
        }
    }

    return b2;
}

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From source file:com.linkbubble.util.Util.java

/**
 * Returns a bitmap suitable for the all apps view.
 *//*from   w  w w .  j  av a2s . com*/
static Bitmap createIconBitmap(Drawable icon, Context context) {
    synchronized (sCanvas) { // we share the statics :-(
        if (sIconWidth == -1) {
            initStatics(context);
        }

        int width = sIconWidth;
        int height = sIconHeight;

        if (icon instanceof PaintDrawable) {
            PaintDrawable painter = (PaintDrawable) icon;
            painter.setIntrinsicWidth(width);
            painter.setIntrinsicHeight(height);
        } else if (icon instanceof BitmapDrawable) {
            // Ensure the bitmap has a density.
            BitmapDrawable bitmapDrawable = (BitmapDrawable) icon;
            Bitmap bitmap = bitmapDrawable.getBitmap();
            if (bitmap.getDensity() == Bitmap.DENSITY_NONE) {
                bitmapDrawable.setTargetDensity(context.getResources().getDisplayMetrics());
            }
        }
        int sourceWidth = icon.getIntrinsicWidth();
        int sourceHeight = icon.getIntrinsicHeight();
        if (sourceWidth > 0 && sourceHeight > 0) {
            // There are intrinsic sizes.
            if (width < sourceWidth || height < sourceHeight) {
                // It's too big, scale it down.
                final float ratio = (float) sourceWidth / sourceHeight;
                if (sourceWidth > sourceHeight) {
                    height = (int) (width / ratio);
                } else if (sourceHeight > sourceWidth) {
                    width = (int) (height * ratio);
                }
            } else if (sourceWidth < width && sourceHeight < height) {
                // Don't scale up the icon
                width = sourceWidth;
                height = sourceHeight;
            }
        }

        // no intrinsic size --> use default size
        int textureWidth = sIconTextureWidth;
        int textureHeight = sIconTextureHeight;

        final Bitmap bitmap = Bitmap.createBitmap(textureWidth, textureHeight, Bitmap.Config.ARGB_8888);
        final Canvas canvas = sCanvas;
        canvas.setBitmap(bitmap);

        final int left = (textureWidth - width) / 2;
        final int top = (textureHeight - height) / 2;

        @SuppressWarnings("all") // suppress dead code warning
        final boolean debug = false;
        if (debug) {
            // draw a big box for the icon for debugging
            canvas.drawColor(sColors[sColorIndex]);
            if (++sColorIndex >= sColors.length)
                sColorIndex = 0;
            Paint debugPaint = new Paint();
            debugPaint.setColor(0xffcccc00);
            canvas.drawRect(left, top, left + width, top + height, debugPaint);
        }

        sOldBounds.set(icon.getBounds());
        icon.setBounds(left, top, left + width, top + height);
        icon.draw(canvas);
        icon.setBounds(sOldBounds);
        canvas.setBitmap(null);

        return bitmap;
    }
}

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From source file:com.android.leanlauncher.WidgetPreviewLoader.java

private static void renderDrawableToBitmap(Drawable d, Bitmap bitmap, int x, int y, int w, int h) {
    if (bitmap != null) {
        final Canvas c = new Canvas(bitmap);
        Rect oldBounds = d.copyBounds();
        d.setBounds(x, y, x + w, y + h);
        d.draw(c);/*  w w w.  j a  va  2s.  c o m*/
        d.setBounds(oldBounds); // Restore the bounds
        c.setBitmap(null);
    }
}

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From source file:Main.java

private static Bitmap createBitmap(Bitmap source, int x, int y, int width, int height, Matrix m, float offset,
        boolean clipShadow, Paint paint) {

    int scaledWidth = width;
    int scaledHeight = height;

    final Canvas canvas = new Canvas();
    canvas.translate(offset / 2.0f, offset / 2.0f);

    Bitmap bitmap;//from   w  w  w .  ja v a2s.c  o m

    final Rect from = new Rect(x, y, x + width, y + height);
    final RectF to = new RectF(0, 0, width, height);

    if (m == null || m.isIdentity()) {
        bitmap = Bitmap.createBitmap(scaledWidth + (int) offset,
                scaledHeight + (int) (clipShadow ? (offset / 2.0f) : offset), Bitmap.Config.ARGB_8888);
        paint = null;
    } else {
        RectF mapped = new RectF();
        m.mapRect(mapped, to);

        scaledWidth = Math.round(mapped.width());
        scaledHeight = Math.round(mapped.height());

        bitmap = Bitmap.createBitmap(scaledWidth + (int) offset,
                scaledHeight + (int) (clipShadow ? (offset / 2.0f) : offset), Bitmap.Config.ARGB_8888);
        canvas.translate(-mapped.left, -mapped.top);
        canvas.concat(m);
    }

    canvas.setBitmap(bitmap);
    canvas.drawRect(0.0f, 0.0f, width, height, paint);
    canvas.drawBitmap(source, from, to, SCALE_PAINT);

    return bitmap;
}

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From source file:com.android.cts.verifier.managedprovisioning.NfcTestActivity.java

/**
 * Creates a Bitmap image that contains red on white text with a specified margin.
 * @param text Text to be displayed in the image.
 * @return A Bitmap image with the above specification.
 *//*from   w w  w.jav a2 s . c  o  m*/
private Bitmap createSampleImage(String text) {
    Paint paint = new Paint();
    paint.setStyle(Paint.Style.FILL);
    paint.setTextSize(TEXT_SIZE);
    Rect rect = new Rect();
    paint.getTextBounds(text, 0, text.length(), rect);
    int w = 2 * MARGIN + rect.right - rect.left;
    int h = 2 * MARGIN + rect.bottom - rect.top;
    Bitmap dest = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas();
    canvas.setBitmap(dest);
    paint.setColor(Color.WHITE);
    canvas.drawPaint(paint);
    paint.setColor(Color.RED);
    canvas.drawText(text, MARGIN - rect.left, MARGIN - rect.top, paint);
    return dest;
}

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From source file:com.atwal.wakeup.battery.util.Utilities.java

public static Bitmap composeIcon(Drawable icon, Drawable maskIcon, int width, int height) {
    Bitmap app_mask_icon_scaled = Bitmap.createScaledBitmap(((BitmapDrawable) maskIcon).getBitmap(), width,
            height, false);/*from  w  w w .  j  ava 2  s .c om*/
    Bitmap icon_scaled = Bitmap.createScaledBitmap(((BitmapDrawable) icon).getBitmap(), width, height, false);
    Paint paint = new Paint();
    PorterDuffXfermode porterDuffXfermode = new PorterDuffXfermode(PorterDuff.Mode.SRC_IN);
    Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(bitmap);
    canvas.drawBitmap(app_mask_icon_scaled, 0, 0, paint);
    paint.setXfermode(porterDuffXfermode);
    canvas.drawBitmap(icon_scaled, 0, 0, paint);
    canvas.setBitmap(null);
    return bitmap;
}

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From source file:Main.java

public static Bitmap cropMaxVisibleBitmap(Drawable drawable, int iconSize) {
    Bitmap tmp = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(),
            Bitmap.Config.ARGB_8888);// www  . j a v  a  2 s  .  co  m
    Canvas canvas = new Canvas(tmp);
    drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
    drawable.draw(canvas);

    Rect crop = new Rect(tmp.getWidth(), tmp.getHeight(), -1, -1);
    for (int y = 0; y < tmp.getHeight(); y++) {
        for (int x = 0; x < tmp.getWidth(); x++) {
            int alpha = (tmp.getPixel(x, y) >> 24) & 255;
            if (alpha > 0) { // pixel is not 100% transparent
                if (x < crop.left)
                    crop.left = x;
                if (x > crop.right)
                    crop.right = x;
                if (y < crop.top)
                    crop.top = y;
                if (y > crop.bottom)
                    crop.bottom = y;
            }
        }
    }

    if (crop.width() <= 0 || crop.height() <= 0) {
        return Bitmap.createScaledBitmap(tmp, iconSize, iconSize, true);
    }

    // We want to crop a square region.
    float size = Math.max(crop.width(), crop.height());
    float xShift = (size - crop.width()) * 0.5f;
    crop.left -= Math.floor(xShift);
    crop.right += Math.ceil(xShift);

    float yShift = (size - crop.height()) * 0.5f;
    crop.top -= Math.floor(yShift);
    crop.bottom += Math.ceil(yShift);

    Bitmap finalImage = Bitmap.createBitmap(iconSize, iconSize, Bitmap.Config.ARGB_8888);
    canvas.setBitmap(finalImage);
    float scale = iconSize / size;

    canvas.scale(scale, scale);
    canvas.drawBitmap(tmp, -crop.left, -crop.top, new Paint(Paint.ANTI_ALIAS_FLAG | Paint.FILTER_BITMAP_FLAG));
    canvas.setBitmap(null);
    return finalImage;
}

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From source file:Main.java

public static byte[] makeFontBitmap(String font, String code, int size, float[] arrayOfPos) {
    Canvas c = new Canvas();
    Paint p = new Paint();
    float density = context.getResources().getDisplayMetrics().density;
    //        Log.v(TAG, String.format("makeFontBitmap called(Java): font=%s code=%s density=%f", font, code, density));
    p.setTextSize((float) size * density);
    p.setAntiAlias(true);/*from   w ww.  j a  v  a2  s.  co  m*/

    Rect textBounds = new Rect();
    p.getTextBounds(code, 0, code.length(), textBounds);
    //        Log.v(TAG, String.format("makeFontBitmap textBounds: %d,%d,%d,%d", textBounds.left, textBounds.top, textBounds.right, textBounds.bottom));

    Rect textBoundsAxA = new Rect();
    String axa = String.format("A%sA", code);
    p.getTextBounds(axa, 0, axa.length(), textBoundsAxA);
    Rect textBoundsAA = new Rect();
    String aa = "AA";
    p.getTextBounds(aa, 0, aa.length(), textBoundsAA);

    // cache.distDelta = Vec2(0, 0);
    arrayOfPos[0] = textBounds.left;
    arrayOfPos[1] = textBounds.top;

    // cache.srcWidth = Vec2(16, 16);
    arrayOfPos[2] = textBounds.width();
    arrayOfPos[3] = textBounds.height();

    // cache.step = 16;
    //      arrayOfPos[4] = textBounds.width() + 1;
    arrayOfPos[4] = textBoundsAxA.width() - textBoundsAA.width();

    if (textBounds.width() == 0 || textBounds.height() == 0) {
        Log.v(TAG, "makeFontBitmap: empty");
        return null;
    }

    Bitmap b = Bitmap.createBitmap(textBounds.width(), textBounds.height(), Bitmap.Config.ARGB_8888);
    c.setBitmap(b);

    Rect r = new Rect(0, 0, textBounds.width(), textBounds.height());
    //      p.setColor(Color.RED);
    p.setARGB(0, 0, 0, 0);
    c.drawRect(r, p);
    p.setARGB(255, 255, 255, 255);

    //        Log.v(TAG, "makeFontBitmap: drawText");
    c.drawText(code, -textBounds.left, -textBounds.top, p);
    //        Log.v(TAG, String.format("makeFontBitmap: w=%.2f h=%.2f", arrayOfPos[2], arrayOfPos[3]));

    ByteBuffer buf = ByteBuffer.allocate(textBounds.width() * textBounds.height() * 4);
    //        Log.v(TAG, String.format("makeFontBitmap: b.getRowBytes() %d", b.getRowBytes()));
    buf.position(0);
    b.copyPixelsToBuffer(buf);
    //        Log.v(TAG, String.format("makeFontBitmap results: capacity=%d", buf.capacity()));

    return buf.array();
}

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