static Bitmap applyCustomTransformations(List<Transformation> transformations, Bitmap result) {
for (int i = 0, count = transformations.size(); i < count; i++) {
Transformation transformation = transformations.get(i);
Bitmap newResult = transformation.transform(result);
if (newResult == null) {
StringBuilder builder =
new StringBuilder() //
.append("Transformation ")
.append(transformation.key())
.append(" returned null after ")
.append(i)
.append(" previous transformation(s).\n\nTransformation list:\n");
for (Transformation t : transformations) {
builder.append(t.key()).append('\n');
}
throw new NullPointerException(builder.toString());
}
if (newResult == result && result.isRecycled()) {
throw new IllegalStateException(
"Transformation " + transformation.key() + " returned input Bitmap but recycled it.");
}
// If the transformation returned a new bitmap ensure they recycled the original.
if (newResult != result && !result.isRecycled()) {
throw new IllegalStateException(
"Transformation "
+ transformation.key()
+ " mutated input Bitmap but failed to recycle the original.");
}
result = newResult;
}
return result;
}
/**
* Add a custom transformation to be applied to the image.
*
* <p>Custom transformations will always be run after the built-in transformations.
*/
public Builder transform(@NonNull Transformation transformation) {
if (transformation == null) {
throw new IllegalArgumentException("Transformation must not be null.");
}
if (transformation.key() == null) {
throw new IllegalArgumentException("Transformation key must not be null.");
}
if (transformations == null) {
transformations = new ArrayList<Transformation>(2);
}
transformations.add(transformation);
return this;
}
@Override
public String toString() {
final StringBuilder builder = new StringBuilder("Request{");
if (resourceId > 0) {
builder.append(resourceId);
} else {
builder.append(uri);
}
if (transformations != null && !transformations.isEmpty()) {
for (Transformation transformation : transformations) {
builder.append(' ').append(transformation.key());
}
}
if (stableKey != null) {
builder.append(" stableKey(").append(stableKey).append(')');
}
if (targetWidth > 0) {
builder.append(" resize(").append(targetWidth).append(',').append(targetHeight).append(')');
}
if (centerCrop) {
builder.append(" centerCrop");
}
if (centerInside) {
builder.append(" centerInside");
}
if (rotationDegrees != 0) {
builder.append(" rotation(").append(rotationDegrees);
if (hasRotationPivot) {
builder.append(" @ ").append(rotationPivotX).append(',').append(rotationPivotY);
}
builder.append(')');
}
if (purgeable) {
builder.append(" purgeable");
}
if (config != null) {
builder.append(' ').append(config);
}
builder.append('}');
return builder.toString();
}
