Question

第一个位图设置为填充整个画布。然后我添加了另一个使用以下方法从imageview创建的位图：

tattoo.buildDrawingCache();
Bitmap bit2 = tattoo.getDrawingCache();

然后我想将这个位图添加到另一个位图上，使其相对于另一个位图具有相同的比例，旋转和平移。我的问题是，虽然规模和轮换似乎很好，但翻译转移到一边或另一边。

public static Bitmap overlay(Bitmap bmp1, Bitmap bmp2) {

    Bitmap bmOverlay = Bitmap.createBitmap(bmp1.getWidth(), bmp1.getHeight(), bmp1.getConfig());
    Canvas canvas = new Canvas(bmOverlay);
    canvas.drawBitmap(bmp1, 0,0 , null);

    Matrix matrix = new Matrix();
    matrix.setScale(tattoo.getScaleX() / imageView.getScaleX(), tattoo.getScaleY() / imageView.getScaleY());

    int[] tattooCoords = getRelativeCoords(tattoo);
    int[] imageViewCoords = getRelativeCoords(imageView);
    matrix.setTranslate(tattooCoords[0] - imageViewCoords[0], tattooCoords[1] - imageViewCoords[1]);
    matrix.postRotate(tattoo.getRotation(), tattoo.getX() + tattoo.getWidth() / 2,
            tattoo.getY() + tattoo.getHeight() / 2);
    canvas.drawBitmap(bmp2, matrix, null);

    bmp1.recycle();
    bmp2.recycle();

    return bmOverlay;

}

private static int[] getRelativeCoords(View v){
    View parent = v.getRootView();
    int[] viewLocation = new int[2];
    v.getLocationInWindow(viewLocation);

    int[] rootLocation = new int[2];
    parent.getLocationInWindow(rootLocation);

    int relativeLeft = viewLocation[0] - rootLocation[0];
    int relativeTop  = viewLocation[1] - rootLocation[1];

    return new int[]{relativeLeft, relativeTop};
}

Answer 1

public static Bitmap combineBitmap(Bitmap background, Bitmap foreground) {
    Bitmap result;
    try {
        if (background == null) {
            return null;
        }
        int bgWidth = background.getWidth();
        int bgHeight = background.getHeight();
        int fgWidth = foreground.getWidth();
        int fgHeight = foreground.getHeight();
        result = Bitmap.createBitmap(bgWidth, bgHeight, Config.ARGB_8888);
        Canvas cv = new Canvas(result);
        cv.drawBitmap(background, 0, 0, null);
        cv.drawBitmap(foreground, (bgWidth - fgWidth) / 2, (bgHeight - fgHeight) / 2, null);
        cv.save(Canvas.ALL_SAVE_FLAG);
        cv.restore();
        return result;
    } catch (Exception e) {
        return null;
    }
}

Answer 2

检查两个图像是否具有相同的图像具有相同的高度和宽度，然后检查每个像素是否相等。

  boolean  imagesEqualCheck(Image img1, Image img2)
 {
if (img1.getHeight() != img2.getHeight()) return false;
if (img1.getWidth() != img2.getWidth()) return false;

for (int y = 0; y < img1.getHeight(); ++y)
   for (int x = 0; x < img1.getWidth(); ++x)
        if (img1.getPixel(x, y) != img2.getPixel(x, y)) return false;
return true;
 }

如何在Android中组合两个位图

2 个答案: