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New MipmapDrawable class.

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This Drawable holds different scaled version of a Drawable and use the appropriate one
depending on its actual bounds to minimize scaling artifacts.

Change-Id: I4ced045d73c1ddd8982d9aaf39c3599b3ac58a16
This commit is contained in:
Gilles Debunne
2010-04-09 15:37:19 -07:00
parent 75b84a2d04
commit 78aaa97b77
5 changed files with 390 additions and 12 deletions
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23
graphics/java/android/graphics/drawable/DrawableContainer.java
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@@ -17,8 +17,16 @@
package android.graphics.drawable;
import android.content.res.Resources;
import android.graphics.*;
import android.graphics.Canvas;
import android.graphics.ColorFilter;
import android.graphics.PixelFormat;
import android.graphics.Rect;
/**
* A helper class that contains several {@link Drawable}s and selects which one to use.
*
* You can subclass it to create your own DrawableContainers or directly use one its child classes.
*/
public class DrawableContainer extends Drawable implements Drawable.Callback {
/**
@@ -196,8 +204,7 @@ public class DrawableContainer extends Drawable implements Drawable.Callback {
mDrawableContainerState.getOpacity();
}
public boolean selectDrawable(int idx)
{
public boolean selectDrawable(int idx) {
if (idx == mCurIndex) {
return false;
}
@@ -255,6 +262,12 @@ public class DrawableContainer extends Drawable implements Drawable.Callback {
return this;
}
/**
* A ConstantState that can contain several {@link Drawable}s.
*
* This class was made public to enable testing, and its visibility may change in a future
* release.
*/
public abstract static class DrawableContainerState extends ConstantState {
final DrawableContainer mOwner;
@@ -443,12 +456,12 @@ public class DrawableContainer extends Drawable implements Drawable.Callback {
return mConstantMinimumHeight;
}
private void computeConstantSize() {
protected void computeConstantSize() {
mComputedConstantSize = true;
final int N = getChildCount();
final Drawable[] drawables = mDrawables;
mConstantWidth = mConstantHeight = 0;
mConstantWidth = mConstantHeight = -1;
mConstantMinimumWidth = mConstantMinimumHeight = 0;
for (int i = 0; i < N; i++) {
Drawable dr = drawables[i];