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Add a decoder that can retrieve Bitmaps from most types of Drawables.
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library/src/main/java/com/bumptech/glide/load/resource/bitmap/ResourceBitmapDecoder.java
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| package com.bumptech.glide.load.resource.bitmap; | ||
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| import android.content.ContentResolver; | ||
| import android.graphics.Bitmap; | ||
| import android.graphics.Bitmap.Config; | ||
| import android.graphics.Canvas; | ||
| import android.graphics.drawable.Animatable; | ||
| import android.graphics.drawable.BitmapDrawable; | ||
| import android.graphics.drawable.Drawable; | ||
| import android.net.Uri; | ||
| import android.support.annotation.Nullable; | ||
| import com.bumptech.glide.load.Options; | ||
| import com.bumptech.glide.load.ResourceDecoder; | ||
| import com.bumptech.glide.load.engine.Resource; | ||
| import com.bumptech.glide.load.engine.bitmap_recycle.BitmapPool; | ||
| import com.bumptech.glide.load.resource.drawable.ResourceDrawableDecoder; | ||
| import com.bumptech.glide.request.target.Target; | ||
| import java.io.IOException; | ||
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| /** | ||
| * Decodes {@link Bitmap}s from resource ids. | ||
| * | ||
| * <p>The framework will decode some resources as {@link Drawable}s that do not wrap | ||
| * {@link Bitmap}s. This decoder will attempt to return a {@link Bitmap} for those | ||
| * {@link Drawable}s anyway by drawing the {@link Drawable} to a {@link Canvas}s using | ||
| * the {@link Drawable}'s intrinsic bounds or the dimensions provided to | ||
| * {@link #decode(Object, int, int, Options)}. | ||
| * | ||
| * <p>For non-{@link Bitmap} {@link Drawable}s that return <= 0 for | ||
| * {@link Drawable#getIntrinsicWidth()} and/or {@link Drawable#getIntrinsicHeight()}, this | ||
| * decoder will fail if the width and height provided to {@link #decode(Object, int, int, Options)} | ||
| * are {@link Target#SIZE_ORIGINAL}. | ||
| */ | ||
| public class ResourceBitmapDecoder implements ResourceDecoder<Uri, Bitmap> { | ||
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| private final ResourceDrawableDecoder drawableDecoder; | ||
| private final BitmapPool bitmapPool; | ||
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| public ResourceBitmapDecoder(ResourceDrawableDecoder drawableDecoder, BitmapPool bitmapPool) { | ||
| this.drawableDecoder = drawableDecoder; | ||
| this.bitmapPool = bitmapPool; | ||
| } | ||
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| @Override | ||
| public boolean handles(Uri source, Options options) throws IOException { | ||
| return ContentResolver.SCHEME_ANDROID_RESOURCE.equals(source.getScheme()); | ||
| } | ||
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| @Nullable | ||
| @Override | ||
| public Resource<Bitmap> decode(Uri source, int width, int height, Options options) | ||
| throws IOException { | ||
| Resource<Drawable> drawableResource = drawableDecoder.decode(source, width, height, options); | ||
| if (drawableResource == null) { | ||
| return null; | ||
| } | ||
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| // Handle DrawableContainer or StateListDrawables that may contain one or more BitmapDrawables. | ||
| Drawable drawable = drawableResource.get().getCurrent(); | ||
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| Bitmap result = null; | ||
| if (drawable instanceof BitmapDrawable) { | ||
| result = ((BitmapDrawable) drawable).getBitmap(); | ||
| } else if (!(drawable instanceof Animatable)) { | ||
| result = drawToBitmap(drawable, width, height); | ||
| } | ||
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| if (result == null) { | ||
| return null; | ||
| } | ||
| return new BitmapResource(result, bitmapPool); | ||
| } | ||
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| private Bitmap drawToBitmap(Drawable drawable, int width, int height) { | ||
| if (width == Target.SIZE_ORIGINAL && drawable.getIntrinsicWidth() <= 0) { | ||
| throw new IllegalArgumentException("Unable to draw " + drawable + " to Bitmap with " | ||
| + "Target.SIZE_ORIGINAL because the Drawable has no intrinsic width"); | ||
| } | ||
| if (height == Target.SIZE_ORIGINAL && drawable.getIntrinsicHeight() <= 0) { | ||
| throw new IllegalArgumentException("Unable to draw " + drawable + " to Bitmap with " | ||
| + "Target.SIZE_ORIGINAL because the Drawable has no intrinsic height"); | ||
| } | ||
| int targetWidth = drawable.getIntrinsicWidth() > 0 ? drawable.getIntrinsicWidth() : width; | ||
| int targetHeight = drawable.getIntrinsicHeight() > 0 ? drawable.getIntrinsicHeight() : height; | ||
| Bitmap result = Bitmap.createBitmap(targetWidth, targetHeight, Config.ARGB_8888); | ||
| Canvas canvas = new Canvas(result); | ||
| drawable.setBounds(0, 0, targetWidth, targetHeight); | ||
| drawable.draw(canvas); | ||
| canvas.setBitmap(null); | ||
| return result; | ||
| } | ||
| } |