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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;
import java.util.Date;
import java.util.Random;
public class GrainFilter extends Filter {
private static final int RAND_THRESHOLD = 128;
@GenerateFieldPort(name = "strength", hasDefault = true)
private float mScale = 0f;
@GenerateFieldPort(name = "tile_size", hasDefault = true)
private int mTileSize = 640;
private Program mGrainProgram;
private Program mNoiseProgram;
private int mWidth = 0;
private int mHeight = 0;
private int mTarget = FrameFormat.TARGET_UNSPECIFIED;
private Random mRandom;
private final String mNoiseShader =
"precision mediump float;\n" +
"uniform vec2 seed;\n" +
"varying vec2 v_texcoord;\n" +
"float rand(vec2 loc) {\n" +
" float theta1 = dot(loc, vec2(0.9898, 0.233));\n" +
" float theta2 = dot(loc, vec2(12.0, 78.0));\n" +
" float value = cos(theta1) * sin(theta2) + sin(theta1) * cos(theta2);\n" +
// keep value of part1 in range: (2^-14 to 2^14).
" float temp = mod(197.0 * value, 1.0) + value;\n" +
" float part1 = mod(220.0 * temp, 1.0) + temp;\n" +
" float part2 = value * 0.5453;\n" +
" float part3 = cos(theta1 + theta2) * 0.43758;\n" +
" return fract(part1 + part2 + part3);\n" +
"}\n" +
"void main() {\n" +
" gl_FragColor = vec4(rand(v_texcoord + seed), 0.0, 0.0, 1.0);\n" +
"}\n";
private final String mGrainShader =
"precision mediump float;\n" +
"uniform sampler2D tex_sampler_0;\n" +
"uniform sampler2D tex_sampler_1;\n" +
"uniform float scale;\n" +
"uniform float stepX;\n" +
"uniform float stepY;\n" +
"varying vec2 v_texcoord;\n" +
"void main() {\n" +
" float noise = texture2D(tex_sampler_1, v_texcoord + vec2(-stepX, -stepY)).r * 0.224;\n" +
" noise += texture2D(tex_sampler_1, v_texcoord + vec2(-stepX, stepY)).r * 0.224;\n" +
" noise += texture2D(tex_sampler_1, v_texcoord + vec2(stepX, -stepY)).r * 0.224;\n" +
" noise += texture2D(tex_sampler_1, v_texcoord + vec2(stepX, stepY)).r * 0.224;\n" +
" noise += 0.4448;\n" +
" noise *= scale;\n" +
" vec4 color = texture2D(tex_sampler_0, v_texcoord);\n" +
" float energy = 0.33333 * color.r + 0.33333 * color.g + 0.33333 * color.b;\n" +
" float mask = (1.0 - sqrt(energy));\n" +
" float weight = 1.0 - 1.333 * mask * noise;\n" +
" gl_FragColor = vec4(color.rgb * weight, color.a);\n" +
"}\n";
public GrainFilter(String name) {
super(name);
mRandom = new Random(new Date().getTime());
}
@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, mNoiseShader);
shaderProgram.setMaximumTileSize(mTileSize);
mNoiseProgram = shaderProgram;
shaderProgram = new ShaderProgram(context, mGrainShader);
shaderProgram.setMaximumTileSize(mTileSize);
mGrainProgram = shaderProgram;
break;
default:
throw new RuntimeException("Filter Sharpen does not support frames of " +
"target " + target + "!");
}
mTarget = target;
}
private void updateParameters() {
float seed[] = { mRandom.nextFloat(), mRandom.nextFloat() };
mNoiseProgram.setHostValue("seed", seed);
mGrainProgram.setHostValue("scale", mScale);
}
private void updateFrameSize(int width, int height) {
mWidth = width;
mHeight = height;
if (mGrainProgram != null) {
mGrainProgram.setHostValue("stepX", 0.5f / mWidth);
mGrainProgram.setHostValue("stepY", 0.5f / mHeight);
updateParameters();
}
}
@Override
public void fieldPortValueUpdated(String name, FilterContext context) {
if (mGrainProgram != null && mNoiseProgram != null) {
updateParameters();
}
}
@Override
public void process(FilterContext context) {
// Get input frame
Frame input = pullInput("image");
FrameFormat inputFormat = input.getFormat();
FrameFormat noiseFormat = ImageFormat.create(inputFormat.getWidth() / 2,
inputFormat.getHeight() / 2,
ImageFormat.COLORSPACE_RGBA,
FrameFormat.TARGET_GPU);
// Create noise frame
Frame noiseFrame = context.getFrameManager().newFrame(inputFormat);
// Create output frame
Frame output = context.getFrameManager().newFrame(inputFormat);
// Create program if not created already
if (mNoiseProgram == null || mGrainProgram == null || inputFormat.getTarget() != mTarget) {
initProgram(context, inputFormat.getTarget());
updateParameters();
}
// Check if the frame size has changed
if (inputFormat.getWidth() != mWidth || inputFormat.getHeight() != mHeight) {
updateFrameSize(inputFormat.getWidth(), inputFormat.getHeight());
}
Frame[] empty = {};
mNoiseProgram.process(empty, noiseFrame);
// Process
Frame[] inputs = {input, noiseFrame};
mGrainProgram.process(inputs, output);
// Push output
pushOutput("image", output);
// Release pushed frame
output.release();
noiseFrame.release();
}
}
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