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