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fix "rough scaling" bitmaps

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Fixes #3347
Closes #3408
// FREEBIE
This commit is contained in:
Jake McGinty 2015-06-11 22:32:30 -07:00 committed by Moxie Marlinspike
parent 5116c61f43
commit f72cd5b0ff
2 changed files with 51 additions and 9 deletions
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26
src/org/thoughtcrime/securesms/util/BitmapUtil.java
View File

@ -133,17 +133,11 @@ public class BitmapUtil {
final int imageWidth = options.outWidth;
final int imageHeight = options.outHeight;
int scaler = 1;
int scaleFactor = (constrainedMemory ? 1 : 2);
while ((imageWidth / scaler / scaleFactor >= maxWidth) && (imageHeight / scaler / scaleFactor >= maxHeight)) {
scaler *= 2;
}
options.inSampleSize = scaler;
options.inSampleSize = getScaleFactor(imageWidth, imageHeight, maxWidth, maxHeight, constrainedMemory);
options.inJustDecodeBounds = false;
BufferedInputStream is = new BufferedInputStream(data);
Bitmap roughThumbnail = BitmapFactory.decodeStream(is, null, options);
InputStream is = new BufferedInputStream(data);
Bitmap roughThumbnail = BitmapFactory.decodeStream(is, null, options);
try {
is.close();
} catch (IOException ioe) {
@ -189,6 +183,20 @@ public class BitmapUtil {
}
}
@VisibleForTesting static int getScaleFactor(int inWidth, int inHeight,
int maxWidth, int maxHeight,
boolean constrained)
{
int scaler = 1;
while (!constrained && ((inWidth / scaler / 2 >= maxWidth) && (inHeight / scaler / 2 >= maxHeight))) {
scaler *= 2;
}
while (constrained && ((inWidth / scaler > maxWidth) || (inHeight / scaler > maxHeight))) {
scaler *= 2;
}
return scaler;
}
private static Bitmap fixOrientation(Bitmap bitmap, InputStream orientationStream) {
final int orientation = Exif.getOrientation(orientationStream);

34
test/androidTest/java/org/thoughtcrime/securesms/util/BitmapUtilTest.java Normal file
View File

@ -0,0 +1,34 @@
package org.thoughtcrime.securesms.util;
import org.thoughtcrime.securesms.TextSecureTestCase;
public class BitmapUtilTest extends TextSecureTestCase {
public void testScaleFactorNormal() {
assertEquals(1, BitmapUtil.getScaleFactor(1000, 1000, 9000, 9000, false));
assertEquals(1, BitmapUtil.getScaleFactor(1000, 1000, 750, 750, false));
assertEquals(2, BitmapUtil.getScaleFactor(1000, 1000, 500, 500, false));
assertEquals(2, BitmapUtil.getScaleFactor(1000, 1000, 499, 499, false));
assertEquals(4, BitmapUtil.getScaleFactor(1000, 1000, 250, 250, false));
assertEquals(4, BitmapUtil.getScaleFactor(1000, 1000, 249, 249, false));
assertEquals(1, BitmapUtil.getScaleFactor(1000, 500, 750, 750, false));
assertEquals(1, BitmapUtil.getScaleFactor(2000, 1000, 501, 501, false));
assertEquals(2, BitmapUtil.getScaleFactor(2000, 1000, 500, 500, false));
assertEquals(2, BitmapUtil.getScaleFactor(1000, 2000, 499, 499, false));
}
public void testScaleFactorConstrained() {
assertEquals(1, BitmapUtil.getScaleFactor(1000, 1000, 9000, 9000, true));
assertEquals(2, BitmapUtil.getScaleFactor(1000, 1000, 750, 750, true));
assertEquals(2, BitmapUtil.getScaleFactor(1000, 1000, 500, 500, true));
assertEquals(4, BitmapUtil.getScaleFactor(1000, 1000, 499, 499, true));
assertEquals(4, BitmapUtil.getScaleFactor(1000, 1000, 250, 250, true));
assertEquals(8, BitmapUtil.getScaleFactor(1000, 1000, 249, 249, true));
assertEquals(2, BitmapUtil.getScaleFactor(1000, 500, 750, 750, true));
assertEquals(4, BitmapUtil.getScaleFactor(2000, 1000, 500, 500, true));
assertEquals(8, BitmapUtil.getScaleFactor(1000, 2000, 499, 499, true));
}
}