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
28public class CrossProcessFilter extends Filter {
29
30    @GenerateFieldPort(name = "tile_size", hasDefault = true)
31    private int mTileSize = 640;
32
33    private Program mProgram;
34
35    private int mTarget = FrameFormat.TARGET_UNSPECIFIED;
36
37    private final String mCrossProcessShader =
38            "precision mediump float;\n" +
39            "uniform sampler2D tex_sampler_0;\n" +
40            "varying vec2 v_texcoord;\n" +
41            "void main() {\n" +
42            "  vec4 color = texture2D(tex_sampler_0, v_texcoord);\n" +
43            "  vec3 ncolor = vec3(0.0, 0.0, 0.0);\n" +
44            "  float value;\n" +
45            "  if (color.r < 0.5) {\n" +
46            "    value = color.r;\n" +
47            "  } else {\n" +
48            "    value = 1.0 - color.r;\n" +
49            "  }\n" +
50            "  float red = 4.0 * value * value * value;\n" +
51            "  if (color.r < 0.5) {\n" +
52            "    ncolor.r = red;\n" +
53            "  } else {\n" +
54            "    ncolor.r = 1.0 - red;\n" +
55            "  }\n" +
56            "  if (color.g < 0.5) {\n" +
57            "    value = color.g;\n" +
58            "  } else {\n" +
59            "    value = 1.0 - color.g;\n" +
60            "  }\n" +
61            "  float green = 2.0 * value * value;\n" +
62            "  if (color.g < 0.5) {\n" +
63            "    ncolor.g = green;\n" +
64            "  } else {\n" +
65            "    ncolor.g = 1.0 - green;\n" +
66            "  }\n" +
67            "  ncolor.b = color.b * 0.5 + 0.25;\n" +
68            "  gl_FragColor = vec4(ncolor.rgb, color.a);\n" +
69            "}\n";
70
71    public CrossProcessFilter(String name) {
72        super(name);
73    }
74
75    @Override
76    public void setupPorts() {
77        addMaskedInputPort("image", ImageFormat.create(ImageFormat.COLORSPACE_RGBA));
78        addOutputBasedOnInput("image", "image");
79    }
80
81    @Override
82    public FrameFormat getOutputFormat(String portName, FrameFormat inputFormat) {
83        return inputFormat;
84    }
85
86    public void initProgram(FilterContext context, int target) {
87        switch (target) {
88            case FrameFormat.TARGET_GPU:
89                ShaderProgram shaderProgram = new ShaderProgram(context, mCrossProcessShader);
90                shaderProgram.setMaximumTileSize(mTileSize);
91                mProgram = shaderProgram;
92                break;
93
94            default:
95                throw new RuntimeException("Filter CrossProcess does not support frames of " +
96                    "target " + target + "!");
97        }
98        mTarget = target;
99    }
100
101    @Override
102    public void process(FilterContext context) {
103        // Get input frame
104        Frame input = pullInput("image");
105        FrameFormat inputFormat = input.getFormat();
106
107        // Create program if not created already
108        if (mProgram == null || inputFormat.getTarget() != mTarget) {
109            initProgram(context, inputFormat.getTarget());
110        }
111
112        // Create output frame
113        Frame output = context.getFrameManager().newFrame(inputFormat);
114
115        // Process
116        mProgram.process(input, output);
117
118        // Push output
119        pushOutput("image", output);
120
121        // Release pushed frame
122        output.release();
123    }
124}
125