| /* |
| * 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.filterfw.geometry.Quad; |
| import android.filterfw.geometry.Point; |
| |
| /** |
| * @hide |
| */ |
| public class StraightenFilter extends Filter { |
| |
| @GenerateFieldPort(name = "angle", hasDefault = true) |
| private float mAngle = 0f; |
| |
| @GenerateFieldPort(name = "maxAngle", hasDefault = true) |
| private float mMaxAngle = 45f; |
| |
| @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 static final float DEGREE_TO_RADIAN = (float) Math.PI / 180.0f; |
| |
| public StraightenFilter(String name) { |
| super(name); |
| } |
| |
| @Override |
| public void setupPorts() { |
| addMaskedInputPort("image", ImageFormat.create(ImageFormat.COLORSPACE_RGBA)); |
| addOutputBasedOnInput("image", "image"); |
| } |
| |
| public void initProgram(FilterContext context, int target) { |
| switch (target) { |
| case FrameFormat.TARGET_GPU: |
| ShaderProgram shaderProgram = ShaderProgram.createIdentity(context); |
| shaderProgram.setMaximumTileSize(mTileSize); |
| mProgram = 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 (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()); |
| } |
| |
| // Create output frame |
| if (inputFormat.getWidth() != mWidth || inputFormat.getHeight() != mHeight) { |
| mWidth = inputFormat.getWidth(); |
| mHeight = inputFormat.getHeight(); |
| updateParameters(); |
| } |
| |
| Frame output = context.getFrameManager().newFrame(inputFormat); |
| |
| // Process |
| mProgram.process(input, output); |
| |
| // Push output |
| pushOutput("image", output); |
| |
| // Release pushed frame |
| output.release(); |
| } |
| |
| private void updateParameters() { |
| float cosTheta = (float) Math.cos(mAngle * DEGREE_TO_RADIAN); |
| float sinTheta = (float) Math.sin(mAngle * DEGREE_TO_RADIAN); |
| |
| if (mMaxAngle <= 0) |
| throw new RuntimeException("Max angle is out of range (0-180)."); |
| mMaxAngle = (mMaxAngle > 90) ? 90 : mMaxAngle; |
| |
| Point p0 = new Point(-cosTheta * mWidth + sinTheta * mHeight, |
| -sinTheta * mWidth - cosTheta * mHeight); |
| |
| Point p1 = new Point(cosTheta * mWidth + sinTheta * mHeight, |
| sinTheta * mWidth - cosTheta * mHeight); |
| |
| Point p2 = new Point(-cosTheta * mWidth - sinTheta * mHeight, |
| -sinTheta * mWidth + cosTheta * mHeight); |
| |
| Point p3 = new Point(cosTheta * mWidth - sinTheta * mHeight, |
| sinTheta * mWidth + cosTheta * mHeight); |
| |
| float maxWidth = (float) Math.max(Math.abs(p0.x), Math.abs(p1.x)); |
| float maxHeight = (float) Math.max(Math.abs(p0.y), Math.abs(p1.y)); |
| |
| float scale = 0.5f * Math.min( mWidth / maxWidth, |
| mHeight / maxHeight); |
| |
| p0.set(scale * p0.x / mWidth + 0.5f, scale * p0.y / mHeight + 0.5f); |
| p1.set(scale * p1.x / mWidth + 0.5f, scale * p1.y / mHeight + 0.5f); |
| p2.set(scale * p2.x / mWidth + 0.5f, scale * p2.y / mHeight + 0.5f); |
| p3.set(scale * p3.x / mWidth + 0.5f, scale * p3.y / mHeight + 0.5f); |
| |
| Quad quad = new Quad(p0, p1, p2, p3); |
| ((ShaderProgram) mProgram).setSourceRegion(quad); |
| } |
| } |