| /* |
| * 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 android.util.Log; |
| |
| public class FillLightFilter extends Filter { |
| |
| @GenerateFieldPort(name = "tile_size", hasDefault = true) |
| private int mTileSize = 640; |
| |
| @GenerateFieldPort(name = "strength", hasDefault = true) |
| private float mBacklight = 0f; |
| |
| private Program mProgram; |
| |
| private int mTarget = FrameFormat.TARGET_UNSPECIFIED; |
| |
| private final String mFillLightShader = |
| "precision mediump float;\n" + |
| "uniform sampler2D tex_sampler_0;\n" + |
| "uniform float mult;\n" + |
| "uniform float igamma;\n" + |
| "varying vec2 v_texcoord;\n" + |
| "void main()\n" + |
| "{\n" + |
| " const vec3 color_weights = vec3(0.25, 0.5, 0.25);\n" + |
| " vec4 color = texture2D(tex_sampler_0, v_texcoord);\n" + |
| " float lightmask = dot(color.rgb, color_weights);\n" + |
| " float backmask = (1.0 - lightmask);\n" + |
| " vec3 ones = vec3(1.0, 1.0, 1.0);\n" + |
| " vec3 diff = pow(mult * color.rgb, igamma * ones) - color.rgb;\n" + |
| " diff = min(diff, 1.0);\n" + |
| " vec3 new_color = min(color.rgb + diff * backmask, 1.0);\n" + |
| " gl_FragColor = vec4(new_color, color.a);\n" + |
| "}\n"; |
| |
| public FillLightFilter(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, mFillLightShader); |
| Log.e("FillLight", "tile size: " + mTileSize); |
| shaderProgram.setMaximumTileSize(mTileSize); |
| mProgram = shaderProgram; |
| break; |
| |
| default: |
| throw new RuntimeException("Filter FillLight does not support frames of " + |
| "target " + target + "!"); |
| } |
| mTarget = target; |
| } |
| |
| |
| @Override |
| public void process(FilterContext context) { |
| // Get input frame |
| Frame input = pullInput("image"); |
| FrameFormat inputFormat = input.getFormat(); |
| |
| // Create output frame |
| Frame output = context.getFrameManager().newFrame(inputFormat); |
| |
| // Create program if not created already |
| if (mProgram == null || inputFormat.getTarget() != mTarget) { |
| initProgram(context, inputFormat.getTarget()); |
| updateParameters(); |
| } |
| |
| // Process |
| mProgram.process(input, output); |
| |
| // Push output |
| pushOutput("image", output); |
| |
| // Release pushed frame |
| output.release(); |
| } |
| |
| |
| @Override |
| public void fieldPortValueUpdated(String name, FilterContext context) { |
| if (mProgram != null) { |
| updateParameters(); |
| } |
| } |
| |
| private void updateParameters() { |
| float fade_gamma = 0.3f; |
| float amt = 1.0f - mBacklight; |
| float mult = 1.0f / (amt * 0.7f + 0.3f); |
| float faded = fade_gamma + (1.0f -fade_gamma) *mult; |
| float igamma = 1.0f / faded; |
| |
| mProgram.setHostValue("mult", mult); |
| mProgram.setHostValue("igamma", igamma); |
| } |
| } |