/*
* 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 java.util.Date;
import java.util.Random;
public class LomoishFilter extends Filter {
@GenerateFieldPort(name = "tile_size", hasDefault = true)
private int mTileSize = 640;
private Program mProgram;
private Random mRandom;
private int mWidth = 0;
private int mHeight = 0;
private int mTarget = FrameFormat.TARGET_UNSPECIFIED;
private final String mLomoishShader =
"precision mediump float;\n" +
"uniform sampler2D tex_sampler_0;\n" +
"uniform vec2 seed;\n" +
"uniform float stepsizeX;\n" +
"uniform float stepsizeY;\n" +
"uniform float stepsize;\n" +
"uniform vec2 scale;\n" +
"uniform float inv_max_dist;\n" +
"varying vec2 v_texcoord;\n" +
"float rand(vec2 loc) {\n" +
" float theta1 = dot(loc, vec2(0.9898, 0.233));\n" +
" float theta2 = dot(loc, vec2(12.0, 78.0));\n" +
" float value = cos(theta1) * sin(theta2) + sin(theta1) * cos(theta2);\n" +
// keep value of part1 in range: (2^-14 to 2^14).
" float temp = mod(197.0 * value, 1.0) + value;\n" +
" float part1 = mod(220.0 * temp, 1.0) + temp;\n" +
" float part2 = value * 0.5453;\n" +
" float part3 = cos(theta1 + theta2) * 0.43758;\n" +
" return fract(part1 + part2 + part3);\n" +
"}\n" +
"void main() {\n" +
// sharpen
" vec3 nbr_color = vec3(0.0, 0.0, 0.0);\n" +
" vec2 coord;\n" +
" vec4 color = texture2D(tex_sampler_0, v_texcoord);\n" +
" coord.x = v_texcoord.x - 0.5 * stepsizeX;\n" +
" coord.y = v_texcoord.y - stepsizeY;\n" +
" nbr_color += texture2D(tex_sampler_0, coord).rgb - color.rgb;\n" +
" coord.x = v_texcoord.x - stepsizeX;\n" +
" coord.y = v_texcoord.y + 0.5 * stepsizeY;\n" +
" nbr_color += texture2D(tex_sampler_0, coord).rgb - color.rgb;\n" +
" coord.x = v_texcoord.x + stepsizeX;\n" +
" coord.y = v_texcoord.y - 0.5 * stepsizeY;\n" +
" nbr_color += texture2D(tex_sampler_0, coord).rgb - color.rgb;\n" +
" coord.x = v_texcoord.x + stepsizeX;\n" +
" coord.y = v_texcoord.y + 0.5 * stepsizeY;\n" +
" nbr_color += texture2D(tex_sampler_0, coord).rgb - color.rgb;\n" +
" vec3 s_color = vec3(color.rgb + 0.3 * nbr_color);\n" +
// cross process
" vec3 c_color = vec3(0.0, 0.0, 0.0);\n" +
" float value;\n" +
" if (s_color.r < 0.5) {\n" +
" value = s_color.r;\n" +
" } else {\n" +
" value = 1.0 - s_color.r;\n" +
" }\n" +
" float red = 4.0 * value * value * value;\n" +
" if (s_color.r < 0.5) {\n" +
" c_color.r = red;\n" +
" } else {\n" +
" c_color.r = 1.0 - red;\n" +
" }\n" +
" if (s_color.g < 0.5) {\n" +
" value = s_color.g;\n" +
" } else {\n" +
" value = 1.0 - s_color.g;\n" +
" }\n" +
" float green = 2.0 * value * value;\n" +
" if (s_color.g < 0.5) {\n" +
" c_color.g = green;\n" +
" } else {\n" +
" c_color.g = 1.0 - green;\n" +
" }\n" +
" c_color.b = s_color.b * 0.5 + 0.25;\n" +
// blackwhite
" float dither = rand(v_texcoord + seed);\n" +
" vec3 xform = clamp((c_color.rgb - 0.15) * 1.53846, 0.0, 1.0);\n" +
" vec3 temp = clamp((color.rgb + stepsize - 0.15) * 1.53846, 0.0, 1.0);\n" +
" vec3 bw_color = clamp(xform + (temp - xform) * (dither - 0.5), 0.0, 1.0);\n" +
// vignette
" coord = v_texcoord - vec2(0.5, 0.5);\n" +
" float dist = length(coord * scale);\n" +
" float lumen = 0.85 / (1.0 + exp((dist * inv_max_dist - 0.73) * 20.0)) + 0.15;\n" +
" gl_FragColor = vec4(bw_color * lumen, color.a);\n" +
"}\n";
public LomoishFilter(String name) {
super(name);
mRandom = new Random(new Date().getTime());
}
@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, mLomoishShader);
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", 1.0f / max_dist);
mProgram.setHostValue("stepsize", 1.0f / 255.0f);
mProgram.setHostValue("stepsizeX", 1.0f / mWidth);
mProgram.setHostValue("stepsizeY", 1.0f / mHeight);
float seed[] = { mRandom.nextFloat(), mRandom.nextFloat() };
mProgram.setHostValue("seed", seed);
}
}
@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();
}
}
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