爲合成縮放矩陣變換圖像

Question

我正在設置一個攝像機視圖，在其上方有一個圖像視圖，並使用矩陣變換在圖像周圍移動圖像。當我拍攝照片時，我希望能夠將圖像合成到照片上，並正確尊重位置和縮放比例。這張照片只有肖像，如果是風景，它就會旋轉。

public void onPictureTaken(byte[] data, Camera camera) { 

    BitmapFactory.Options opt = new BitmapFactory.Options(); 
    this.newPhoto = BitmapFactory.decodeByteArray(data, 0, data.length, opt); 

    int photoWidth = newPhoto.getWidth() > newPhoto.getHeight()?newPhoto.getHeight():newPhoto.getWidth(); 
    int photoHeight = newPhoto.getWidth() > newPhoto.getHeight()?newPhoto.getWidth():newPhoto.getHeight(); 

    //Preview is fullscreen 
    Display display = getWindowManager().getDefaultDisplay(); 
    int previewWidth = display.getWidth(); 
    int previewHeight = display.getHeight(); 


    float scale = (float)photoHeight/(float)previewHeight; 
    float scaleX = (float)photoWidth/(float)previewWidth; 

    Bitmap finished = Bitmap.createBitmap(photoWidth, photoHeight, newPhoto.getConfig()); 

    //Create canvas and draw photo into it 
    //[snip] 

    //Draw character onto canvas 
    int imageResource = getResources().getIdentifier(character + "large", "drawable", getPackageName()); 
    if (imageResource != 0) { 
     Bitmap character = BitmapFactory.decodeResource(this.getResources(), imageResource); 
     RectF rect = new RectF(); 
     float[] values = new float[9]; 

     matrix.getValues(values); 
     rect.left = values[Matrix.MTRANS_X] * scaleX; 
     rect.top = values[Matrix.MTRANS_Y] * scale; 
     //273x322 WidthxHeight of preview character image 
     rect.right = rect.left + (273 * values[Matrix.MSCALE_X]) * scale; 
     rect.bottom = rect.top + (322 * values[Matrix.MSCALE_Y]) * scale; 

     //Logging here 


     canvas.drawBitmap(character, null, rect, null); 
     character.recycle(); 
    } 


    System.gc(); 
    newPhoto = finished; 
    showDialog(DIALOG_PHOTO_RESULT); 
} 

日誌：

預覽：爲480x854照片：最高1536x2048

規模：2.3981264

矩陣：（112.45,375.85）規模：（1.00,1.00）

Rect：（359.8342,901.34326）w：654.6885 h：772.1968

圖像矩形似乎不會縮放得足夠大，因爲生成的合成圖像的字符太靠近頂部/左側和太小。

Answer 1

的問題是，Android的是前縮放它扔掉了我所有的規模計算

通過字符圖像移動到drawable-nodpi文件夾，我能夠阻止Android的縮放圖像的裝置的字符圖像，以便圖像可以縮放以匹配相機視圖。