mirror/Android
1
0
Fork 0
mirror of https://github.com/CatimaLoyalty/Android.git synced 2026-01-05 21:48:01 -05:00
Code Issues Packages Projects Releases Wiki Activity

Scale barcodes to ImageView's size without filtering

Browse Source 
It turns out that the library used to create datamatrix barcodes
returns the smallest image necessary to contain the barcode. That
is, the size passed into the barcode writer. If the ImageView
scales the tiny image itself into the full size it will use
bi-linear filtering, which results in a blurry barcode.

To avoid this, if scaling is needed do so without using filtering.
This commit is contained in:
Branden Archer
2016-05-21 18:26:21 -04:00
parent dc4a41088c
commit cecec15762
1 changed files with 17 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

17
app/src/main/java/protect/card_locker/BarcodeImageWriterTask.java
View File

@@ -67,6 +67,23 @@ class BarcodeImageWriterTask extends AsyncTask<Void, Void, Bitmap>
Bitmap bitmap = Bitmap.createBitmap(bitMatrixWidth, bitMatrixHeight,
Bitmap.Config.ARGB_8888);
bitmap.setPixels(pixels, 0, bitMatrixWidth, 0, 0, bitMatrixWidth, bitMatrixHeight);
// Determine if the image needs to be scaled.
// This is necessary because the datamatrix barcode generator
// ignores the requested size and returns the smallest image necessary
// to represent the barcode. If we let the ImageView scale the image
// it will use bi-linear filtering, which results in a blurry barcode.
// To avoid this, if scaling is needed do so without filtering.
int heightScale = imageHeight / bitMatrixHeight;
int widthScale = imageWidth / bitMatrixHeight;
int scalingFactor = Math.min(heightScale, widthScale);
if(scalingFactor > 1)
{
bitmap = Bitmap.createScaledBitmap(bitmap, bitMatrixWidth * scalingFactor, bitMatrixHeight * scalingFactor, false);
}
return bitmap;
}
catch (WriterException | IllegalArgumentException e)