+++ /dev/null
-/*
- * Copyright 2008 ZXing authors
- *
- * 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.google.zxing.client.android;
-
-import android.content.Context;
-import android.graphics.Canvas;
-import android.graphics.Color;
-import android.graphics.Paint;
-import android.graphics.Point;
-import android.graphics.Rect;
-import android.view.SurfaceHolder;
-import android.view.SurfaceView;
-import com.google.zxing.ResultPoint;
-
-/**
- * @author dswitkin@google.com (Daniel Switkin)
- */
-final class CameraSurfaceView extends SurfaceView implements SurfaceHolder.Callback {
-
- private static final int[] SCANNER_ALPHA = {0, 64, 128, 192, 255, 192, 128, 64};
-
- private final CameraManager cameraManager;
- private final SurfaceHolder surfaceHolder;
- private boolean hasSurface;
- private int scannerAlpha;
-
- CameraSurfaceView(Context context, CameraManager cameraManager) {
- super(context);
- this.cameraManager = cameraManager;
-
- // Install a SurfaceHolder.Callback so we get notified when the underlying surface is created
- // and destroyed.
- surfaceHolder = getHolder();
- surfaceHolder.addCallback(this);
- hasSurface = false;
- scannerAlpha = 0;
- surfaceHolder.setSizeFromLayout();
- }
-
- public void surfaceCreated(SurfaceHolder holder) {
- hasSurface = true;
- }
-
- public void surfaceDestroyed(SurfaceHolder holder) {
- // FIXME(dswitkin): The docs say this surface will be destroyed when this method returns. In
- // practice this has not been a problem so far. I need to investigate.
- hasSurface = false;
- }
-
- public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
- // Surface size or format has changed. This won't happen because of the setFixedSize() call.
- }
-
- /**
- * This method is only called from the WorkerThread. It's job is to grab the next preview frame
- * from the camera, draw the framing rectangle, and blit everything to the screen.
- */
- public void capturePreviewAndDraw() {
- if (hasSurface) {
- Canvas canvas = surfaceHolder.lockCanvas();
- cameraManager.capturePreview(canvas);
- Rect frame = cameraManager.getFramingRect();
- int width = canvas.getBitmapWidth();
- int height = canvas.getBitmapHeight();
-
- // Draw the exterior (i.e. outside the framing rect) as half darkened
- Paint paint = new Paint();
- paint.setColor(Color.BLACK);
- paint.setAlpha(96);
- Rect box = new Rect(0, 0, width, frame.top);
- canvas.drawRect(box, paint);
- box.set(0, frame.top, frame.left, frame.bottom + 1);
- canvas.drawRect(box, paint);
- box.set(frame.right + 1, frame.top, width, frame.bottom + 1);
- canvas.drawRect(box, paint);
- box.set(0, frame.bottom + 1, width, height);
- canvas.drawRect(box, paint);
-
- // Draw a two pixel solid black border inside the framing rect
- paint.setAlpha(255);
- box.set(frame.left, frame.top, frame.right + 1, frame.top + 2);
- canvas.drawRect(box, paint);
- box.set(frame.left, frame.top + 2, frame.left + 2, frame.bottom - 1);
- canvas.drawRect(box, paint);
- box.set(frame.right - 1, frame.top, frame.right + 1, frame.bottom - 1);
- canvas.drawRect(box, paint);
- box.set(frame.left, frame.bottom - 1, frame.right + 1, frame.bottom + 1);
- canvas.drawRect(box, paint);
-
- // Draw a red "laser scanner" line through the middle
- paint.setColor(Color.RED);
- paint.setAlpha(SCANNER_ALPHA[scannerAlpha]);
- int middle = frame.height() / 2 + frame.top;
- box.set(frame.left + 2, middle - 1, frame.right - 1, middle + 2);
- canvas.drawRect(box, paint);
-
- surfaceHolder.unlockCanvasAndPost(canvas);
-
- // This cheap animation is tied to the rate at which we pull previews from the camera.
- scannerAlpha = (scannerAlpha + 1) % SCANNER_ALPHA.length;
- }
- }
-
- /**
- * Draw a line for 1D barcodes (which return two points) or otherwise a set of points returned
- * from the decoder to indicate what we found.
- * TODO(dswitkin): It might be nice to clear the framing rect and zoom in on the actual still that
- * was captured, then paint the green points on it. This would also clear the red scanner line
- * which doesn't make sense after the capture.
- *
- * @param resultPoints An array of points from the decoder, whose coordinates are expressed
- * relative to the still image from the camera.
- */
- public void drawResultPoints(ResultPoint[] resultPoints) {
- if (hasSurface) {
- Canvas canvas = surfaceHolder.lockCanvas();
- Paint paint = new Paint();
- paint.setColor(Color.GREEN);
- paint.setAlpha(128);
-
- Point[] points = cameraManager.convertResultPoints(resultPoints);
- if (points.length == 2) {
- paint.setStrokeWidth(4);
- canvas.drawLine(points[0].x, points[0].y, points[1].x, points[1].y, paint);
- } else {
- paint.setStrokeWidth(10);
- for (int x = 0; x < points.length; x++) {
- canvas.drawPoint(points[x].x, points[x].y, paint);
- }
- }
-
- surfaceHolder.unlockCanvasAndPost(canvas);
- }
- }
-
-}
projects / zxing.git / blobdiff