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.GenerateFieldPort;
25import android.filterfw.core.GLFrame;
26import android.filterfw.core.KeyValueMap;
27import android.filterfw.core.MutableFrameFormat;
28import android.filterfw.core.NativeProgram;
29import android.filterfw.core.NativeFrame;
30import android.filterfw.core.Program;
31import android.filterfw.core.ShaderProgram;
32import android.filterfw.format.ImageFormat;
33
34import android.opengl.GLES20;
35
36/**
37 * @hide
38 */
39public class ResizeFilter extends Filter {
40
41    @GenerateFieldPort(name = "owidth")
42    private int mOWidth;
43    @GenerateFieldPort(name = "oheight")
44    private int mOHeight;
45    @GenerateFieldPort(name = "keepAspectRatio", hasDefault = true)
46    private boolean mKeepAspectRatio = false;
47    @GenerateFieldPort(name = "generateMipMap", hasDefault = true)
48    private boolean mGenerateMipMap = false;
49
50    private Program mProgram;
51    private FrameFormat mLastFormat = null;
52
53    private MutableFrameFormat mOutputFormat;
54    private int mInputChannels;
55
56    public ResizeFilter(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    protected void createProgram(FilterContext context, FrameFormat format) {
72        if (mLastFormat != null && mLastFormat.getTarget() == format.getTarget()) return;
73        mLastFormat = format;
74        switch (format.getTarget()) {
75            case FrameFormat.TARGET_NATIVE:
76                throw new RuntimeException("Native ResizeFilter not implemented yet!");
77
78
79            case FrameFormat.TARGET_GPU:
80                ShaderProgram prog = ShaderProgram.createIdentity(context);
81                mProgram = prog;
82                break;
83
84            default:
85                throw new RuntimeException("ResizeFilter could not create suitable program!");
86        }
87    }
88    @Override
89    public void process(FilterContext env) {
90        // Get input frame
91        Frame input = pullInput("image");
92        createProgram(env, input.getFormat());
93
94        // Create output frame
95        MutableFrameFormat outputFormat = input.getFormat().mutableCopy();
96        if (mKeepAspectRatio) {
97            FrameFormat inputFormat = input.getFormat();
98            mOHeight = mOWidth * inputFormat.getHeight() / inputFormat.getWidth();
99        }
100        outputFormat.setDimensions(mOWidth, mOHeight);
101        Frame output = env.getFrameManager().newFrame(outputFormat);
102
103        // Process
104        if (mGenerateMipMap) {
105            GLFrame mipmapped = (GLFrame)env.getFrameManager().newFrame(input.getFormat());
106            mipmapped.setTextureParameter(GLES20.GL_TEXTURE_MIN_FILTER,
107                                          GLES20.GL_LINEAR_MIPMAP_NEAREST);
108            mipmapped.setDataFromFrame(input);
109            mipmapped.generateMipMap();
110            mProgram.process(mipmapped, output);
111            mipmapped.release();
112        } else {
113            mProgram.process(input, output);
114        }
115
116        // Push output
117        pushOutput("image", output);
118
119        // Release pushed frame
120        output.release();
121    }
122
123
124}
125