1/*
2 * Copyright (C) 2011 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.layoutlib.bridge.impl;
18
19import static com.android.ide.common.rendering.api.Result.Status.ERROR_UNKNOWN;
20
21import com.android.ide.common.rendering.api.DrawableParams;
22import com.android.ide.common.rendering.api.HardwareConfig;
23import com.android.ide.common.rendering.api.ResourceValue;
24import com.android.ide.common.rendering.api.Result;
25import com.android.ide.common.rendering.api.Result.Status;
26import com.android.layoutlib.bridge.android.BridgeContext;
27import com.android.resources.ResourceType;
28
29import android.graphics.Bitmap;
30import android.graphics.Bitmap_Delegate;
31import android.graphics.Canvas;
32import android.graphics.drawable.Drawable;
33import android.view.AttachInfo_Accessor;
34import android.view.View.MeasureSpec;
35import android.widget.FrameLayout;
36
37import java.awt.AlphaComposite;
38import java.awt.Color;
39import java.awt.Graphics2D;
40import java.awt.image.BufferedImage;
41import java.io.IOException;
42
43/**
44 * Action to render a given Drawable provided through {@link DrawableParams#getDrawable()}.
45 *
46 * The class only provides a simple {@link #render()} method, but the full life-cycle of the
47 * action must be respected.
48 *
49 * @see RenderAction
50 *
51 */
52public class RenderDrawable extends RenderAction<DrawableParams> {
53
54    public RenderDrawable(DrawableParams params) {
55        super(new DrawableParams(params));
56    }
57
58    public Result render() {
59        checkLock();
60        try {
61            // get the drawable resource value
62            DrawableParams params = getParams();
63            HardwareConfig hardwareConfig = params.getHardwareConfig();
64            ResourceValue drawableResource = params.getDrawable();
65
66            // resolve it
67            BridgeContext context = getContext();
68            drawableResource = context.getRenderResources().resolveResValue(drawableResource);
69
70            if (drawableResource == null ||
71                    drawableResource.getResourceType() != ResourceType.DRAWABLE) {
72                return Status.ERROR_NOT_A_DRAWABLE.createResult();
73            }
74
75            // create a simple FrameLayout
76            FrameLayout content = new FrameLayout(context);
77
78            // get the actual Drawable object to draw
79            Drawable d = ResourceHelper.getDrawable(drawableResource, context);
80            content.setBackground(d);
81
82            // set the AttachInfo on the root view.
83            AttachInfo_Accessor.setAttachInfo(content);
84
85
86            // measure
87            int w = hardwareConfig.getScreenWidth();
88            int h = hardwareConfig.getScreenHeight();
89            int w_spec = MeasureSpec.makeMeasureSpec(w, MeasureSpec.EXACTLY);
90            int h_spec = MeasureSpec.makeMeasureSpec(h, MeasureSpec.EXACTLY);
91            content.measure(w_spec, h_spec);
92
93            // now do the layout.
94            content.layout(0, 0, w, h);
95
96            // preDraw setup
97            AttachInfo_Accessor.dispatchOnPreDraw(content);
98
99            // draw into a new image
100            BufferedImage image = getImage(w, h);
101
102            // create an Android bitmap around the BufferedImage
103            Bitmap bitmap = Bitmap_Delegate.createBitmap(image,
104                    true /*isMutable*/, hardwareConfig.getDensity());
105
106            // create a Canvas around the Android bitmap
107            Canvas canvas = new Canvas(bitmap);
108            canvas.setDensity(hardwareConfig.getDensity().getDpiValue());
109
110            // and draw
111            content.draw(canvas);
112
113            return Status.SUCCESS.createResult(image);
114        } catch (IOException e) {
115            return ERROR_UNKNOWN.createResult(e.getMessage(), e);
116        }
117    }
118
119    protected BufferedImage getImage(int w, int h) {
120        BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB);
121        Graphics2D gc = image.createGraphics();
122        gc.setComposite(AlphaComposite.Src);
123
124        gc.setColor(new Color(0x00000000, true));
125        gc.fillRect(0, 0, w, h);
126
127        // done
128        gc.dispose();
129
130        return image;
131    }
132
133}
134