protected Options prepareDecodingOptions(ImageSize imageSize, ImageDecodingInfo decodingInfo) {
ImageScaleType scaleType = decodingInfo.getImageScaleType();
int scale;
if (scaleType == ImageScaleType.NONE) {
scale = ImageSizeUtils.computeMinImageSampleSize(imageSize);
} else {
ImageSize targetSize = decodingInfo.getTargetSize();
boolean powerOf2 = scaleType == ImageScaleType.IN_SAMPLE_POWER_OF_2;
scale =
ImageSizeUtils.computeImageSampleSize(
imageSize, targetSize, decodingInfo.getViewScaleType(), powerOf2);
}
if (scale > 1 && loggingEnabled) {
L.d(
LOG_SABSAMPLE_IMAGE,
imageSize,
imageSize.scaleDown(scale),
scale,
decodingInfo.getImageKey());
}
Options decodingOptions = decodingInfo.getDecodingOptions();
decodingOptions.inSampleSize = scale;
return decodingOptions;
}
protected Bitmap considerExactScaleAndOrientaiton(
Bitmap subsampledBitmap,
ImageDecodingInfo decodingInfo,
int rotation,
boolean flipHorizontal) {
Matrix m = new Matrix();
// Scale to exact size if need
ImageScaleType scaleType = decodingInfo.getImageScaleType();
if (scaleType == ImageScaleType.EXACTLY || scaleType == ImageScaleType.EXACTLY_STRETCHED) {
ImageSize srcSize =
new ImageSize(subsampledBitmap.getWidth(), subsampledBitmap.getHeight(), rotation);
float scale =
ImageSizeUtils.computeImageScale(
srcSize,
decodingInfo.getTargetSize(),
decodingInfo.getViewScaleType(),
scaleType == ImageScaleType.EXACTLY_STRETCHED);
if (Float.compare(scale, 1f) != 0) {
m.setScale(scale, scale);
if (loggingEnabled) {
L.d(LOG_SCALE_IMAGE, srcSize, srcSize.scale(scale), scale, decodingInfo.getImageKey());
}
}
}
// Flip bitmap if need
if (flipHorizontal) {
m.postScale(-1, 1);
if (loggingEnabled) L.d(LOG_FLIP_IMAGE, decodingInfo.getImageKey());
}
// Rotate bitmap if need
if (rotation != 0) {
m.postRotate(rotation);
if (loggingEnabled) L.d(LOG_ROTATE_IMAGE, rotation, decodingInfo.getImageKey());
}
Bitmap finalBitmap =
Bitmap.createBitmap(
subsampledBitmap,
0,
0,
subsampledBitmap.getWidth(),
subsampledBitmap.getHeight(),
m,
true);
if (finalBitmap != subsampledBitmap) {
subsampledBitmap.recycle();
}
return finalBitmap;
}