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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.NativeProgram;
import android.filterfw.core.NativeFrame;
import android.filterfw.core.Program;
import android.filterfw.core.ShaderProgram;
import android.filterfw.format.ImageFormat;
public class VignetteFilter extends Filter {
@GenerateFieldPort(name = "scale", hasDefault = true)
private float mScale = 0f;
@GenerateFieldPort(name = "tile_size", hasDefault = true)
private int mTileSize = 640;
private Program mProgram;
private int mWidth = 0;
private int mHeight = 0;
private int mTarget = FrameFormat.TARGET_UNSPECIFIED;
private final float mSlope = 20.0f;
private final float mShade = 0.85f;
private final String mVignetteShader =
"precision mediump float;\n" +
"uniform sampler2D tex_sampler_0;\n" +
"uniform float range;\n" +
"uniform float inv_max_dist;\n" +
"uniform float shade;\n" +
"uniform vec2 scale;\n" +
"varying vec2 v_texcoord;\n" +
"void main() {\n" +
" const float slope = 20.0;\n" +
" vec2 coord = v_texcoord - vec2(0.5, 0.5);\n" +
" float dist = length(coord * scale);\n" +
" float lumen = shade / (1.0 + exp((dist * inv_max_dist - range) * slope)) + (1.0 - shade);\n" +
" vec4 color = texture2D(tex_sampler_0, v_texcoord);\n" +
" gl_FragColor = vec4(color.rgb * lumen, color.a);\n" +
"}\n";
public VignetteFilter(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, mVignetteShader);
shaderProgram.setMaximumTileSize(mTileSize);
mProgram = shaderProgram;
break;
default:
throw new RuntimeException("Filter Sharpen does not support frames of " +
"target " + target + "!");
}
mTarget = target;
}
private void initParameters() {
if (mProgram != null) {
float scale[] = new float[2];
if (mWidth > mHeight) {
scale[0] = 1f;
scale[1] = ((float) mHeight) / mWidth;
} else {
scale[0] = ((float) mWidth) / mHeight;
scale[1] = 1f;
}
float max_dist = ((float) Math.sqrt(scale[0] * scale[0] + scale[1] * scale[1])) * 0.5f;
mProgram.setHostValue("scale", scale);
mProgram.setHostValue("inv_max_dist", 1f / max_dist);
mProgram.setHostValue("shade", mShade);
updateParameters();
}
}
private void updateParameters() {
// The 'range' is between 1.3 to 0.6. When scale is zero then range is 1.3
// which means no vignette at all because the luminousity difference is
// less than 1/256 and will cause nothing.
mProgram.setHostValue("range", 1.30f - (float) Math.sqrt(mScale) * 0.7f);
}
@Override
public void fieldPortValueUpdated(String name, FilterContext context) {
if (mProgram != 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 (mProgram == null || inputFormat.getTarget() != mTarget) {
initProgram(context, inputFormat.getTarget());
}
// Check if the frame size has changed
if (inputFormat.getWidth() != mWidth || inputFormat.getHeight() != mHeight) {
mWidth = inputFormat.getWidth();
mHeight = inputFormat.getHeight();
initParameters();
}
// Create output frame
Frame output = context.getFrameManager().newFrame(inputFormat);
// Process
mProgram.process(input, output);
// Push output
pushOutput("image", output);
// Release pushed frame
output.release();
}
}
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