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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.Program;
import android.filterfw.core.ShaderProgram;
import android.filterfw.format.ImageFormat;
import android.graphics.Color;
public class TintFilter extends Filter {
@GenerateFieldPort(name = "tint", hasDefault = true)
private int mTint = 0xFF0000FF;
@GenerateFieldPort(name = "tile_size", hasDefault = true)
private int mTileSize = 640;
private Program mProgram;
private int mTarget = FrameFormat.TARGET_UNSPECIFIED;
private final String mTintShader =
"precision mediump float;\n" +
"uniform sampler2D tex_sampler_0;\n" +
"uniform vec3 tint;\n" +
"uniform vec3 color_ratio;\n" +
"varying vec2 v_texcoord;\n" +
"void main() {\n" +
" vec4 color = texture2D(tex_sampler_0, v_texcoord);\n" +
" float avg_color = dot(color_ratio, color.rgb);\n" +
" vec3 new_color = min(0.8 * avg_color + 0.2 * tint, 1.0);\n" +
" gl_FragColor = vec4(new_color.rgb, color.a);\n" +
"}\n";
public TintFilter(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, mTintShader);
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());
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();
}
private void initParameters() {
float color_ratio[] = {0.21f, 0.71f, 0.07f};
mProgram.setHostValue("color_ratio", color_ratio);
updateParameters();
}
private void updateParameters() {
float tint_color[] = {Color.red(mTint) / 255f,
Color.green(mTint) / 255f,
Color.blue(mTint) / 255f };
mProgram.setHostValue("tint", tint_color);
}
}
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