90 lines
3.1 KiB
Java
90 lines
3.1 KiB
Java
/*
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* Copyright (C) 2007 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.graphics;
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import android.annotation.NonNull;
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/**
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* Shader used to draw a bitmap as a texture. The bitmap can be repeated or
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* mirrored by setting the tiling mode.
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*/
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public class BitmapShader extends Shader {
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/**
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* Prevent garbage collection.
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*/
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/*package*/ Bitmap mBitmap;
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private int mTileX;
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private int mTileY;
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/*
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* This is cache of the last value from the Paint of bitmap-filtering.
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* In the future, BitmapShaders will carry their own (expanded) data for this
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* (e.g. including mipmap options, or bicubic weights)
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*
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* When that happens, this bool will become those extended values, and we will
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* need to track whether this Shader was created with those new constructors,
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* or from the current "legacy" constructor, which (for compatibility) will
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* still need to know the Paint's setting.
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*
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* When the filter Paint setting is finally gone, we will be able to remove
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* the filterFromPaint parameter currently being passed to createNativeInstance()
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* and shouldDiscardNativeInstance(), as shaders will always know their filter
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* settings.
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*/
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private boolean mFilterFromPaint;
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/**
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* Call this to create a new shader that will draw with a bitmap.
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*
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* @param bitmap The bitmap to use inside the shader
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* @param tileX The tiling mode for x to draw the bitmap in.
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* @param tileY The tiling mode for y to draw the bitmap in.
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*/
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public BitmapShader(@NonNull Bitmap bitmap, @NonNull TileMode tileX, @NonNull TileMode tileY) {
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this(bitmap, tileX.nativeInt, tileY.nativeInt);
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}
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private BitmapShader(Bitmap bitmap, int tileX, int tileY) {
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if (bitmap == null) {
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throw new IllegalArgumentException("Bitmap must be non-null");
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}
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mBitmap = bitmap;
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mTileX = tileX;
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mTileY = tileY;
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mFilterFromPaint = false;
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}
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/** @hide */
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@Override
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protected long createNativeInstance(long nativeMatrix, boolean filterFromPaint) {
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mFilterFromPaint = filterFromPaint;
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return nativeCreate(nativeMatrix, mBitmap.getNativeInstance(), mTileX, mTileY,
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mFilterFromPaint);
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}
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/** @hide */
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@Override
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protected boolean shouldDiscardNativeInstance(boolean filterFromPaint) {
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return mFilterFromPaint != filterFromPaint;
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}
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private static native long nativeCreate(long nativeMatrix, long bitmapHandle,
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int shaderTileModeX, int shaderTileModeY, boolean filter);
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}
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