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.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 android.util.Log;
32
33public class CrossProcessFilter extends Filter {
34
35    @GenerateFieldPort(name = "tile_size", hasDefault = true)
36    private int mTileSize = 640;
37
38    private Program mProgram;
39
40    private int mTarget = FrameFormat.TARGET_UNSPECIFIED;
41
42    private final String mCrossProcessShader =
43            "precision mediump float;\n" +
44            "uniform sampler2D tex_sampler_0;\n" +
45            "varying vec2 v_texcoord;\n" +
46            "void main() {\n" +
47            "  vec4 color = texture2D(tex_sampler_0, v_texcoord);\n" +
48            "  vec3 ncolor = vec3(0.0, 0.0, 0.0);\n" +
49            "  float value;\n" +
50            "  if (color.r < 0.5) {\n" +
51            "    value = color.r;\n" +
52            "  } else {\n" +
53            "    value = 1.0 - color.r;\n" +
54            "  }\n" +
55            "  float red = 4.0 * value * value * value;\n" +
56            "  if (color.r < 0.5) {\n" +
57            "    ncolor.r = red;\n" +
58            "  } else {\n" +
59            "    ncolor.r = 1.0 - red;\n" +
60            "  }\n" +
61            "  if (color.g < 0.5) {\n" +
62            "    value = color.g;\n" +
63            "  } else {\n" +
64            "    value = 1.0 - color.g;\n" +
65            "  }\n" +
66            "  float green = 2.0 * value * value;\n" +
67            "  if (color.g < 0.5) {\n" +
68            "    ncolor.g = green;\n" +
69            "  } else {\n" +
70            "    ncolor.g = 1.0 - green;\n" +
71            "  }\n" +
72            "  ncolor.b = color.b * 0.5 + 0.25;\n" +
73            "  gl_FragColor = vec4(ncolor.rgb, color.a);\n" +
74            "}\n";
75
76    public CrossProcessFilter(String name) {
77        super(name);
78    }
79
80    @Override
81    public void setupPorts() {
82        addMaskedInputPort("image", ImageFormat.create(ImageFormat.COLORSPACE_RGBA));
83        addOutputBasedOnInput("image", "image");
84    }
85
86    @Override
87    public FrameFormat getOutputFormat(String portName, FrameFormat inputFormat) {
88        return inputFormat;
89    }
90
91    public void initProgram(FilterContext context, int target) {
92        switch (target) {
93            case FrameFormat.TARGET_GPU:
94                ShaderProgram shaderProgram = new ShaderProgram(context, mCrossProcessShader);
95                shaderProgram.setMaximumTileSize(mTileSize);
96                mProgram = shaderProgram;
97                break;
98
99            default:
100                throw new RuntimeException("Filter CrossProcess does not support frames of " +
101                    "target " + target + "!");
102        }
103        mTarget = target;
104    }
105
106    @Override
107    public void process(FilterContext context) {
108        // Get input frame
109        Frame input = pullInput("image");
110        FrameFormat inputFormat = input.getFormat();
111
112        // Create program if not created already
113        if (mProgram == null || inputFormat.getTarget() != mTarget) {
114            initProgram(context, inputFormat.getTarget());
115        }
116
117        // Create output frame
118        Frame output = context.getFrameManager().newFrame(inputFormat);
119
120        // Process
121        mProgram.process(input, output);
122
123        // Push output
124        pushOutput("image", output);
125
126        // Release pushed frame
127        output.release();
128    }
129}
130