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