Crop-to-fit image in Android
Solution 1
Thanks to open source, I found the answer from Android Gallery source code here at line 230 :-D
croppedImage = Bitmap.createBitmap(mOutputX, mOutputY, Bitmap.Config.RGB_565);
Canvas canvas = new Canvas(croppedImage);
Rect srcRect = mCrop.getCropRect();
Rect dstRect = new Rect(0, 0, mOutputX, mOutputY);
int dx = (srcRect.width() - dstRect.width()) / 2;
int dy = (srcRect.height() - dstRect.height()) / 2;
// If the srcRect is too big, use the center part of it.
srcRect.inset(Math.max(0, dx), Math.max(0, dy));
// If the dstRect is too big, use the center part of it.
dstRect.inset(Math.max(0, -dx), Math.max(0, -dy));
// Draw the cropped bitmap in the center
canvas.drawBitmap(mBitmap, srcRect, dstRect, null);
Solution 2
I know this is an incredibly late reply, but something like this maybe:
public static Bitmap scaleCropToFit(Bitmap original, int targetWidth, int targetHeight){
//Need to scale the image, keeping the aspect ration first
int width = original.getWidth();
int height = original.getHeight();
float widthScale = (float) targetWidth / (float) width;
float heightScale = (float) targetHeight / (float) height;
float scaledWidth;
float scaledHeight;
int startY = 0;
int startX = 0;
if (widthScale > heightScale) {
scaledWidth = targetWidth;
scaledHeight = height * widthScale;
//crop height by...
startY = (int) ((scaledHeight - targetHeight) / 2);
} else {
scaledHeight = targetHeight;
scaledWidth = width * heightScale;
//crop width by..
startX = (int) ((scaledWidth - targetWidth) / 2);
}
Bitmap scaledBitmap = Bitmap.createScaledBitmap(original, (int) scaledWidth, (int) scaledHeight, true);
Bitmap resizedBitmap = Bitmap.createBitmap(scaledBitmap, startX, startY, targetWidth, targetHeight);
return resizedBitmap;
}
dezull
Currently I write Ruby & Javascript on daily basis. Previously I worked a lot on PHP. Occasionally, I work on Android projects, mostly as a hobby. I speak English and Malay.
Updated on June 14, 2022Comments
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dezull almost 2 years
I've been trying this for some time, I would like to create a wallpaper from a
Bitmap
. Let's say the desired wallpaper size is 320x480, and the source image size is 2048x2048.I'm not sure whether crop-to-fit is the right term, but what I would like to achieve is to get most part of the picture that has the equal ratio as the desired wallpaper size (320x480).
So in this case, I would like to get 2048x1365 or (1365.333... to be exact) from the source
Bitmap
, and scale it down to 320x480.The technique that I have tried is:
1) Crop the Bitmap into 2048x1365 first
bm = Bitmap.createBitmap(bm, xOffset, yOffset, 2048, 1365);
2) Scale it down to 320x480
bm = Bitmap.createScaledBitmap(bm, 320, 480, false);
which produced OutOfMemory error.
Is there any way to achieve this?
Regards,
dezull