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/*
* 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.MutableFrameFormat;
import android.filterfw.core.Program;
import android.filterfw.core.ShaderProgram;
import android.filterfw.geometry.Quad;
import android.filterfw.format.ImageFormat;
import android.filterfw.format.ObjectFormat;
/**
* @hide
*/
public class CropFilter extends Filter {
private Program mProgram;
private FrameFormat mLastFormat = null;
@GenerateFieldPort(name = "owidth")
private int mOutputWidth = -1;
@GenerateFieldPort(name = "oheight")
private int mOutputHeight = -1;
@GenerateFieldPort(name = "fillblack")
private boolean mFillBlack = false;
public CropFilter(String name) {
super(name);
}
private final String mFragShader =
"precision mediump float;\n" +
"uniform sampler2D tex_sampler_0;\n" +
"varying vec2 v_texcoord;\n" +
"void main() {\n" +
" const vec2 lo = vec2(0.0, 0.0);\n" +
" const vec2 hi = vec2(1.0, 1.0);\n" +
" const vec4 black = vec4(0.0, 0.0, 0.0, 1.0);\n" +
" bool out_of_bounds =\n" +
" any(lessThan(v_texcoord, lo)) ||\n" +
" any(greaterThan(v_texcoord, hi));\n" +
" if (out_of_bounds) {\n" +
" gl_FragColor = black;\n" +
" } else {\n" +
" gl_FragColor = texture2D(tex_sampler_0, v_texcoord);\n" +
" }\n" +
"}\n";
@Override
public void setupPorts() {
addMaskedInputPort("image", ImageFormat.create(ImageFormat.COLORSPACE_RGBA));
addMaskedInputPort("box", ObjectFormat.fromClass(Quad.class, FrameFormat.TARGET_SIMPLE));
addOutputBasedOnInput("image", "image");
}
@Override
public FrameFormat getOutputFormat(String portName, FrameFormat inputFormat) {
// Make sure output size is set to unspecified, as we do not know what we will be resizing
// to.
MutableFrameFormat outputFormat = inputFormat.mutableCopy();
outputFormat.setDimensions(FrameFormat.SIZE_UNSPECIFIED, FrameFormat.SIZE_UNSPECIFIED);
return outputFormat;
}
protected void createProgram(FilterContext context, FrameFormat format) {
// TODO: Add CPU version
if (mLastFormat != null && mLastFormat.getTarget() == format.getTarget()) return;
mLastFormat = format;
mProgram = null;
switch (format.getTarget()) {
case FrameFormat.TARGET_GPU:
if(mFillBlack)
mProgram = new ShaderProgram(context, mFragShader);
else
mProgram = ShaderProgram.createIdentity(context);
break;
}
if (mProgram == null) {
throw new RuntimeException("Could not create a program for crop filter " + this + "!");
}
}
@Override
public void process(FilterContext env) {
// Get input frame
Frame imageFrame = pullInput("image");
Frame boxFrame = pullInput("box");
createProgram(env, imageFrame.getFormat());
// Get the box
Quad box = (Quad)boxFrame.getObjectValue();
// Create output format
MutableFrameFormat outputFormat = imageFrame.getFormat().mutableCopy();
outputFormat.setDimensions(mOutputWidth == -1 ? outputFormat.getWidth() : mOutputWidth,
mOutputHeight == -1 ? outputFormat.getHeight() : mOutputHeight);
// Create output frame
Frame output = env.getFrameManager().newFrame(outputFormat);
// Set the program parameters
if (mProgram instanceof ShaderProgram) {
ShaderProgram shaderProgram = (ShaderProgram)mProgram;
shaderProgram.setSourceRegion(box);
}
mProgram.process(imageFrame, output);
// Push output
pushOutput("image", output);
// Release pushed frame
output.release();
}
}
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