| /* |
| * 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(); |
| } |
| } |