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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.filterpacks.imageproc;
import android.filterfw.core.Filter;
import android.filterfw.core.FilterContext;
import android.filterfw.core.Frame;
import android.filterfw.core.FrameFormat;
import android.filterfw.core.GenerateFieldPort;
import android.filterfw.core.KeyValueMap;
import android.filterfw.core.MutableFrameFormat;
import android.filterfw.core.NativeProgram;
import android.filterfw.core.NativeFrame;
import android.filterfw.core.Program;
import android.filterfw.core.ShaderProgram;
import android.filterfw.format.ImageFormat;
import android.util.Log;
import java.lang.reflect.Field;
/**
* @hide
*/
public class ToGrayFilter extends SimpleImageFilter {
@GenerateFieldPort(name = "invertSource", hasDefault = true)
private boolean mInvertSource = false;
@GenerateFieldPort(name = "tile_size", hasDefault = true)
private int mTileSize = 640;
private MutableFrameFormat mOutputFormat;
private static final String mColorToGray4Shader =
"precision mediump float;\n" +
"uniform sampler2D tex_sampler_0;\n" +
"varying vec2 v_texcoord;\n" +
"void main() {\n" +
" vec4 color = texture2D(tex_sampler_0, v_texcoord);\n" +
" float y = dot(color, vec4(0.299, 0.587, 0.114, 0));\n" +
" gl_FragColor = vec4(y, y, y, color.a);\n" +
"}\n";
public ToGrayFilter(String name) {
super(name, null);
}
@Override
public void setupPorts() {
addMaskedInputPort("image", ImageFormat.create(ImageFormat.COLORSPACE_RGBA,
FrameFormat.TARGET_GPU));
addOutputBasedOnInput("image", "image");
}
@Override
protected Program getNativeProgram(FilterContext context) {
throw new RuntimeException("Native toGray not implemented yet!");
}
@Override
protected Program getShaderProgram(FilterContext context) {
int inputChannels = getInputFormat("image").getBytesPerSample();
if (inputChannels != 4) {
throw new RuntimeException("Unsupported GL input channels: " +
inputChannels + "! Channels must be 4!");
}
ShaderProgram program = new ShaderProgram(context, mColorToGray4Shader);
program.setMaximumTileSize(mTileSize);
if (mInvertSource)
program.setSourceRect(0.0f, 1.0f, 1.0f, -1.0f);
return program;
}
}
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