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
17
18package android.filterpacks.imageproc;
19
20import android.filterfw.core.Filter;
21import android.filterfw.core.FilterContext;
22import android.filterfw.core.Frame;
23import android.filterfw.core.FrameFormat;
24import android.filterfw.core.KeyValueMap;
25import android.filterfw.core.NativeProgram;
26import android.filterfw.core.NativeFrame;
27import android.filterfw.core.Program;
28import android.filterfw.core.ShaderProgram;
29import android.filterfw.format.ImageFormat;
30
31import java.lang.reflect.Field;
32import java.util.HashSet;
33import java.util.Set;
34
35/**
36 * @hide
37 */
38public abstract class SimpleImageFilter extends Filter {
39
40    protected int mCurrentTarget = FrameFormat.TARGET_UNSPECIFIED;
41    protected Program mProgram;
42    protected String mParameterName;
43
44    public SimpleImageFilter(String name, String parameterName) {
45        super(name);
46        mParameterName = parameterName;
47    }
48
49    @Override
50    public void setupPorts() {
51        if (mParameterName != null) {
52            try {
53                Field programField = SimpleImageFilter.class.getDeclaredField("mProgram");
54                addProgramPort(mParameterName, mParameterName, programField, float.class, false);
55            } catch (NoSuchFieldException e) {
56                throw new RuntimeException("Internal Error: mProgram field not found!");
57            }
58        }
59        addMaskedInputPort("image", ImageFormat.create(ImageFormat.COLORSPACE_RGBA));
60        addOutputBasedOnInput("image", "image");
61    }
62
63    @Override
64    public FrameFormat getOutputFormat(String portName, FrameFormat inputFormat) {
65        return inputFormat;
66    }
67
68    @Override
69    public void process(FilterContext context) {
70        // Get input frame
71        Frame input = pullInput("image");
72        FrameFormat inputFormat = input.getFormat();
73
74        // Create output frame
75        Frame output = context.getFrameManager().newFrame(inputFormat);
76
77        // Create program if not created already
78        updateProgramWithTarget(inputFormat.getTarget(), context);
79
80        // Process
81        mProgram.process(input, output);
82
83        // Push output
84        pushOutput("image", output);
85
86        // Release pushed frame
87        output.release();
88    }
89
90    protected void updateProgramWithTarget(int target, FilterContext context) {
91        if (target != mCurrentTarget) {
92            switch (target) {
93                case FrameFormat.TARGET_NATIVE:
94                    mProgram = getNativeProgram(context);
95                    break;
96
97                case FrameFormat.TARGET_GPU:
98                    mProgram = getShaderProgram(context);
99                    break;
100
101                default:
102                    mProgram = null;
103                    break;
104            }
105            if (mProgram == null) {
106                throw new RuntimeException("Could not create a program for image filter " + this + "!");
107            }
108            initProgramInputs(mProgram, context);
109            mCurrentTarget = target;
110        }
111    }
112
113    protected abstract Program getNativeProgram(FilterContext context);
114
115    protected abstract Program getShaderProgram(FilterContext context);
116}
117