/*
 * Copyright (C) 2007 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package android.graphics;

/**
 * Shader used to draw a bitmap as a texture. The bitmap can be repeated or
 * mirrored by setting the tiling mode.
 */
public class BitmapShader extends Shader {
    /**
     * Prevent garbage collection.
     * @hide
     */
    @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"})
    public final Bitmap mBitmap;

    private TileMode mTileX;
    private TileMode mTileY;

    /**
     * Call this to create a new shader that will draw with a bitmap.
     *
     * @param bitmap            The bitmap to use inside the shader
     * @param tileX             The tiling mode for x to draw the bitmap in.
     * @param tileY             The tiling mode for y to draw the bitmap in.
     */
    public BitmapShader(Bitmap bitmap, TileMode tileX, TileMode tileY) {
        mBitmap = bitmap;
        mTileX = tileX;
        mTileY = tileY;
        final int b = bitmap.ni();
        native_instance = nativeCreate(b, tileX.nativeInt, tileY.nativeInt);
        native_shader = nativePostCreate(native_instance, b, tileX.nativeInt, tileY.nativeInt);
    }

    /**
     * @hide
     */
    @Override
    protected Shader copy() {
        final BitmapShader copy = new BitmapShader(mBitmap, mTileX, mTileY);
        copyLocalMatrix(copy);
        return copy;
    }

    private static native int nativeCreate(int native_bitmap, int shaderTileModeX,
            int shaderTileModeY);
    private static native int nativePostCreate(int native_shader, int native_bitmap,
            int shaderTileModeX, int shaderTileModeY);
}
