public static Bitmap decodeThumbnail(
JobContext jc, FileDescriptor fd, Options options, int targetSize, int type) {
if (options == null) options = new Options();
jc.setCancelListener(new DecodeCanceller(options));
options.inJustDecodeBounds = true;
BitmapFactory.decodeFileDescriptor(fd, null, options);
if (jc.isCancelled()) return null;
int w = options.outWidth;
int h = options.outHeight;
if (type == MediaItem.TYPE_MICROTHUMBNAIL) {
// We center-crop the original image as it's micro thumbnail. In this case,
// we want to make sure the shorter side >= "targetSize".
float scale = (float) targetSize / Math.min(w, h);
options.inSampleSize = BitmapUtils.computeSampleSizeLarger(scale);
// For an extremely wide image, e.g. 300x30000, we may got OOM when decoding
// it for TYPE_MICROTHUMBNAIL. So we add a max number of pixels limit here.
final int MAX_PIXEL_COUNT = 640000; // 400 x 1600
if ((w / options.inSampleSize) * (h / options.inSampleSize) > MAX_PIXEL_COUNT) {
options.inSampleSize =
BitmapUtils.computeSampleSize(FloatMath.sqrt((float) MAX_PIXEL_COUNT / (w * h)));
}
} else {
// For screen nail, we only want to keep the longer side >= targetSize.
float scale = (float) targetSize / Math.max(w, h);
options.inSampleSize = BitmapUtils.computeSampleSizeLarger(scale);
}
options.inJustDecodeBounds = false;
setOptionsMutable(options);
Bitmap result = BitmapFactory.decodeFileDescriptor(fd, null, options);
if (result == null) return null;
// We need to resize down if the decoder does not support inSampleSize
// (For example, GIF images)
float scale =
(float) targetSize
/ (type == MediaItem.TYPE_MICROTHUMBNAIL
? Math.min(result.getWidth(), result.getHeight())
: Math.max(result.getWidth(), result.getHeight()));
if (scale <= 0.5) result = BitmapUtils.resizeBitmapByScale(result, scale, true);
return ensureGLCompatibleBitmap(result);
}
