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 android.filterpacks.imageproc;
18
19import android.filterfw.core.Filter;
20import android.filterfw.core.FilterContext;
21import android.filterfw.core.Frame;
22import android.filterfw.core.FrameFormat;
23import android.filterfw.core.GenerateFieldPort;
24import android.filterfw.core.Program;
25import android.filterfw.core.ShaderProgram;
26import android.filterfw.format.ImageFormat;
27import android.graphics.Bitmap;
28
29/**
30 * @hide
31 */
32public class BitmapOverlayFilter extends Filter {
33
34    @GenerateFieldPort(name = "bitmap")
35    private Bitmap mBitmap;
36
37    @GenerateFieldPort(name = "tile_size", hasDefault = true)
38    private int mTileSize = 640;
39
40    private Program mProgram;
41    private Frame mFrame;
42
43    private int mTarget = FrameFormat.TARGET_UNSPECIFIED;
44
45    private final String mOverlayShader =
46            "precision mediump float;\n" +
47            "uniform sampler2D tex_sampler_0;\n" +
48            "uniform sampler2D tex_sampler_1;\n" +
49            "varying vec2 v_texcoord;\n" +
50            "void main() {\n" +
51            "  vec4 original = texture2D(tex_sampler_0, v_texcoord);\n" +
52            "  vec4 mask = texture2D(tex_sampler_1, v_texcoord);\n" +
53            "  gl_FragColor = vec4(original.rgb * (1.0 - mask.a) + mask.rgb, 1.0);\n" +
54            "}\n";
55
56    public BitmapOverlayFilter(String name) {
57        super(name);
58    }
59
60    @Override
61    public void setupPorts() {
62        addMaskedInputPort("image", ImageFormat.create(ImageFormat.COLORSPACE_RGBA));
63        addOutputBasedOnInput("image", "image");
64    }
65
66    @Override
67    public FrameFormat getOutputFormat(String portName, FrameFormat inputFormat) {
68        return inputFormat;
69    }
70
71    public void initProgram(FilterContext context, int target) {
72        switch (target) {
73            case FrameFormat.TARGET_GPU:
74                ShaderProgram shaderProgram = new ShaderProgram(context, mOverlayShader);
75                shaderProgram.setMaximumTileSize(mTileSize);
76                mProgram = shaderProgram;
77                break;
78
79            default:
80                throw new RuntimeException("Filter FisheyeFilter does not support frames of " +
81                    "target " + target + "!");
82        }
83        mTarget = target;
84    }
85
86    @Override
87    public void tearDown(FilterContext context) {
88        if (mFrame != null) {
89            mFrame.release();
90            mFrame = null;
91        }
92    }
93
94    @Override
95    public void process(FilterContext context) {
96        // Get input frame
97        Frame input = pullInput("image");
98        FrameFormat inputFormat = input.getFormat();
99
100        // Create output frame
101        Frame output = context.getFrameManager().newFrame(inputFormat);
102
103        // Create program if not created already
104        if (mProgram == null || inputFormat.getTarget() != mTarget) {
105            initProgram(context, inputFormat.getTarget());
106        }
107
108        if (mBitmap != null) {
109            Frame frame = createBitmapFrame(context);
110            // Process
111            Frame[] inputs = {input, frame};
112            mProgram.process(inputs, output);
113
114            frame.release();
115        } else {
116            output.setDataFromFrame(input);
117        }
118
119        // Push output
120        pushOutput("image", output);
121
122        // Release pushed frame
123        output.release();
124    }
125
126    private Frame createBitmapFrame(FilterContext context) {
127        FrameFormat format = ImageFormat.create(mBitmap.getWidth(),
128                                                mBitmap.getHeight(),
129                                                ImageFormat.COLORSPACE_RGBA,
130                                                FrameFormat.TARGET_GPU);
131
132        Frame frame = context.getFrameManager().newFrame(format);
133        frame.setBitmap(mBitmap);
134
135        mBitmap.recycle();
136        mBitmap = null;
137
138        return frame;
139    }
140}
141