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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.Program;
import android.filterfw.core.ShaderProgram;
import android.filterfw.format.ImageFormat;
public class SaturateFilter extends Filter {
@GenerateFieldPort(name = "scale", hasDefault = true)
private float mScale = 0f;
@GenerateFieldPort(name = "tile_size", hasDefault = true)
private int mTileSize = 640;
private Program mBenProgram;
private Program mHerfProgram;
private int mTarget = FrameFormat.TARGET_UNSPECIFIED;
private final String mBenSaturateShader =
"precision mediump float;\n" +
"uniform sampler2D tex_sampler_0;\n" +
"uniform float scale;\n" +
"uniform float shift;\n" +
"uniform vec3 weights;\n" +
"varying vec2 v_texcoord;\n" +
"void main() {\n" +
" vec4 color = texture2D(tex_sampler_0, v_texcoord);\n" +
" float kv = dot(color.rgb, weights) + shift;\n" +
" vec3 new_color = scale * color.rgb + (1.0 - scale) * kv;\n" +
" gl_FragColor = vec4(new_color, color.a);\n" +
"}\n";
private final String mHerfSaturateShader =
"precision mediump float;\n" +
"uniform sampler2D tex_sampler_0;\n" +
"uniform vec3 weights;\n" +
"uniform vec3 exponents;\n" +
"varying vec2 v_texcoord;\n" +
"void main() {\n" +
" vec4 color = texture2D(tex_sampler_0, v_texcoord);\n" +
" float de = dot(color.rgb, weights);\n" +
" float inv_de = 1.0 / de;\n" +
" vec3 new_color = de * pow(color.rgb * inv_de, exponents);\n" +
" float max_color = max(max(max(new_color.r, new_color.g), new_color.b), 1.0);\n" +
" gl_FragColor = vec4(new_color / max_color, color.a);\n" +
"}\n";
public SaturateFilter(String name) {
super(name);
}
@Override
public void setupPorts() {
addMaskedInputPort("image", ImageFormat.create(ImageFormat.COLORSPACE_RGBA));
addOutputBasedOnInput("image", "image");
}
@Override
public FrameFormat getOutputFormat(String portName, FrameFormat inputFormat) {
return inputFormat;
}
public void initProgram(FilterContext context, int target) {
switch (target) {
case FrameFormat.TARGET_GPU:
ShaderProgram shaderProgram = new ShaderProgram(context, mBenSaturateShader);
shaderProgram.setMaximumTileSize(mTileSize);
mBenProgram = shaderProgram;
shaderProgram = new ShaderProgram(context, mHerfSaturateShader);
shaderProgram.setMaximumTileSize(mTileSize);
mHerfProgram = shaderProgram;
break;
default:
throw new RuntimeException("Filter Sharpen does not support frames of " +
"target " + target + "!");
}
mTarget = target;
}
@Override
public void fieldPortValueUpdated(String name, FilterContext context) {
if (mBenProgram != null && mHerfProgram != null) {
updateParameters();
}
}
@Override
public void process(FilterContext context) {
// Get input frame
Frame input = pullInput("image");
FrameFormat inputFormat = input.getFormat();
// Create program if not created already
if (mBenProgram == null || inputFormat.getTarget() != mTarget) {
initProgram(context, inputFormat.getTarget());
initParameters();
}
// Create output frame
Frame output = context.getFrameManager().newFrame(inputFormat);
// Process
if (mScale > 0.0f) {
mHerfProgram.process(input, output);
} else {
mBenProgram.process(input, output);
}
// Push output
pushOutput("image", output);
// Release pushed frame
output.release();
}
private void initParameters() {
float shift = 1.0f / 255.0f;
float weights[] = { 2f/8f, 5f/8f, 1f/8f};
mBenProgram.setHostValue("weights", weights);
mBenProgram.setHostValue("shift", shift);
mHerfProgram.setHostValue("weights", weights);
updateParameters();
}
private void updateParameters() {
if (mScale > 0.0f) {
float exponents[] = new float[3];
exponents[0] = (0.9f * mScale) + 1.0f;
exponents[1] = (2.1f * mScale) + 1.0f;
exponents[2] = (2.7f * mScale) + 1.0f;
mHerfProgram.setHostValue("exponents", exponents);
} else {
mBenProgram.setHostValue("scale", 1.0f + mScale);
}
}
}
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