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