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