How to rotate large images

I tried the code for this article:

http://supportforums.BlackBerry.com/T5/Java-development/rotate-and-scale-bitmaps/Ta-p/492524

but it does not work for larger images like 1024 x 768 and rise IllegalArgumentAxception saying that the bitmap is too large.

OK, I did something that works for me, but is not perfect at all.

It works well for images of 1024 x 768 and turns them but increases the size of the file (if save you them) for some reason any and loses brightness, but the quality is ok at least for the purposes of my application.

Here's what I do:

(1) I take a bitmap (1024 x 768) and create a new bitmap with 1024 x 1024 - width and height

copy 2) old on the new

(3) turn the new bitmap when you rotate a matrix size NxN and return a new bitmap rotated

(4) create a new bitmap to the tour final, but cut the part added so that you get an image size of 768 x 1024

Here's the code. It could be optimized again especially in the rotateSquareImage() method where you can work with arrays of regular tables not 2d.

package com.melonmobile.blackberry.pdfscanner.screens;

import net.rim.device.api.system.Bitmap;

public class ImageRotator {

    public Bitmap rotate(Bitmap oldImage) throws Exception {
        int w = oldImage.getWidth();
        int h = oldImage.getHeight();
        int d = Math.max(w, h);
        int amountPxAdded = 0;
        if (w > h) {
            amountPxAdded = w - h;
        }
        Bitmap oldBitmapSquared = new Bitmap(d, d);
        int[] data = new int[w * h];
        oldImage.getARGB(data, 0, w, 0, 0, w, h);
        oldBitmapSquared.setARGB(data, 0, w, 0, 0, w, h);
        Bitmap finalRes = new Bitmap(h, w);
        int fW = finalRes.getWidth();
        int fH = finalRes.getHeight();
        oldImage = null;
        Bitmap rotated = rotateSquareImage(oldBitmapSquared, 90);
        oldBitmapSquared = null;
        data = new int[fW * fH];
        rotated.getARGB(data, 0, fW, amountPxAdded, 0, fW, fH);
        rotated = null;
        finalRes.setARGB(data, 0, fW, 0, 0, fW, fH);
        return finalRes;
    }

    private Bitmap rotateSquareImage(Bitmap oldB, int angle) throws Exception {
        int w = oldB.getWidth();
        int h = oldB.getHeight();
        Bitmap newB = new Bitmap(w, h);
        int[] oldD = new int[w * h];
        int[] newD = new int[w * h];
        oldB.getARGB(oldD, 0, w, 0, 0, w, h);
        int[][] old2d = new int[h][w];
        int[] js;
        int old2dLen = old2d.length;
        int jsLen;
        for (int i = 0; i < old2dLen; i++) {
            js = old2d[i];
            jsLen = js.length;
            for (int j = 0; j < jsLen; j++) {
                js[j] = oldD[i * w + j];
            }
        }
        int[][] rotated = new int[h][w];
        for (int i = 0; i < h; ++i) {
            for (int j = 0; j < w; ++j) {
                rotated[i][j] = old2d[h - j - 1][i];
            }
        }
        old2d = null;
        for (int i = 0; i < h; ++i) {
            for (int j = 0; j < w; ++j) {
                newD[i * w + j] = rotated[i][j];
            }
        }
        rotated = null;
        newB.setARGB(newD, 0, w, 0, 0, w, h);
        return newB;
    }
}

If someone decides to improve Please publish an improved version, so it could be used by more people.

Tags: BlackBerry Developers

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