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.NativeProgram;
27import android.filterfw.core.NativeFrame;
28import android.filterfw.core.Program;
29import android.filterfw.core.ShaderProgram;
30import android.filterfw.geometry.Quad;
31import android.filterfw.format.ImageFormat;
32import android.filterfw.format.ObjectFormat;
33
34import android.opengl.GLES20;
35
36/**
37 * @hide
38 */
39public class DrawRectFilter extends Filter {
40
41    @GenerateFieldPort(name = "colorRed",  hasDefault = true)
42    private float mColorRed = 0.8f;
43
44    @GenerateFieldPort(name = "colorGreen", hasDefault = true)
45    private float mColorGreen = 0.8f;
46
47    @GenerateFieldPort(name = "colorBlue", hasDefault = true)
48    private float mColorBlue = 0.0f;
49
50    private final String mVertexShader =
51        "attribute vec4 aPosition;\n" +
52        "void main() {\n" +
53        "  gl_Position = aPosition;\n" +
54        "}\n";
55
56    private final String mFixedColorFragmentShader =
57        "precision mediump float;\n" +
58        "uniform vec4 color;\n" +
59        "void main() {\n" +
60        "  gl_FragColor = color;\n" +
61        "}\n";
62
63    private ShaderProgram mProgram;
64
65
66    public DrawRectFilter(String name) {
67        super(name);
68    }
69
70    @Override
71    public void setupPorts() {
72        addMaskedInputPort("image", ImageFormat.create(ImageFormat.COLORSPACE_RGBA,
73                                                       FrameFormat.TARGET_GPU));
74        addMaskedInputPort("box", ObjectFormat.fromClass(Quad.class, FrameFormat.TARGET_SIMPLE));
75        addOutputBasedOnInput("image", "image");
76    }
77
78    @Override
79    public FrameFormat getOutputFormat(String portName, FrameFormat inputFormat) {
80        return inputFormat;
81    }
82
83    @Override
84    public void prepare(FilterContext context) {
85        mProgram = new ShaderProgram(context, mVertexShader, mFixedColorFragmentShader);
86    }
87
88    @Override
89    public void process(FilterContext env) {
90        // Get input frame
91        Frame imageFrame = pullInput("image");
92        Frame boxFrame = pullInput("box");
93
94        // Get the box
95        Quad box = (Quad)boxFrame.getObjectValue();
96        box = box.scaled(2.0f).translated(-1.0f, -1.0f);
97
98        // Create output frame with copy of input
99        GLFrame output = (GLFrame)env.getFrameManager().duplicateFrame(imageFrame);
100
101        // Draw onto output
102        output.focus();
103        renderBox(box);
104
105        // Push output
106        pushOutput("image", output);
107
108        // Release pushed frame
109        output.release();
110    }
111
112    private void renderBox(Quad box) {
113        final int FLOAT_SIZE = 4;
114
115        // Get current values
116        float[] color = {mColorRed, mColorGreen, mColorBlue, 1f};
117        float[] vertexValues = { box.p0.x, box.p0.y,
118                                 box.p1.x, box.p1.y,
119                                 box.p3.x, box.p3.y,
120                                 box.p2.x, box.p2.y };
121
122        // Set the program variables
123        mProgram.setHostValue("color", color);
124        mProgram.setAttributeValues("aPosition", vertexValues, 2);
125        mProgram.setVertexCount(4);
126
127        // Draw
128        mProgram.beginDrawing();
129        GLES20.glLineWidth(1.0f);
130        GLES20.glDrawArrays(GLES20.GL_LINE_LOOP, 0, 4);
131    }
132}
133