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