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;
27
28/**
29 * @hide
30 */
31public class FlipFilter extends Filter {
32
33    @GenerateFieldPort(name = "vertical", hasDefault = true)
34    private boolean mVertical = false;
35
36    @GenerateFieldPort(name = "horizontal", hasDefault = true)
37    private boolean mHorizontal = false;
38
39    @GenerateFieldPort(name = "tile_size", hasDefault = true)
40    private int mTileSize = 640;
41
42    private Program mProgram;
43    private int mTarget = FrameFormat.TARGET_UNSPECIFIED;
44
45    public FlipFilter(String name) {
46        super(name);
47    }
48
49    @Override
50    public void setupPorts() {
51        addMaskedInputPort("image", ImageFormat.create(ImageFormat.COLORSPACE_RGBA));
52        addOutputBasedOnInput("image", "image");
53    }
54
55    @Override
56    public FrameFormat getOutputFormat(String portName, FrameFormat inputFormat) {
57        return inputFormat;
58    }
59
60    public void initProgram(FilterContext context, int target) {
61        switch (target) {
62            case FrameFormat.TARGET_GPU:
63                ShaderProgram shaderProgram = ShaderProgram.createIdentity(context);
64                shaderProgram.setMaximumTileSize(mTileSize);
65                mProgram = shaderProgram;
66                break;
67
68            default:
69                throw new RuntimeException("Filter Sharpen does not support frames of " +
70                    "target " + target + "!");
71        }
72        mTarget = target;
73        updateParameters();
74    }
75
76    @Override
77    public void fieldPortValueUpdated(String name, FilterContext context) {
78        if (mProgram != null) {
79            updateParameters();
80        }
81    }
82
83    @Override
84    public void process(FilterContext context) {
85        // Get input frame
86        Frame input = pullInput("image");
87        FrameFormat inputFormat = input.getFormat();
88
89        // Create program if not created already
90        if (mProgram == null || inputFormat.getTarget() != mTarget) {
91            initProgram(context, inputFormat.getTarget());
92        }
93
94        // Create output frame
95        Frame output = context.getFrameManager().newFrame(inputFormat);
96
97        // Process
98        mProgram.process(input, output);
99
100        // Push output
101        pushOutput("image", output);
102
103        // Release pushed frame
104        output.release();
105    }
106
107    private void updateParameters() {
108        float x_origin = (mHorizontal) ? 1.0f : 0.0f;
109        float y_origin = (mVertical) ? 1.0f : 0.0f;
110
111        float width  = (mHorizontal) ? -1.0f : 1.0f;
112        float height  = (mVertical) ? -1.0f : 1.0f;
113
114        ((ShaderProgram) mProgram).setSourceRect(x_origin, y_origin, width, height);
115    }
116}
117