130ab3fc173709a491c9e2e103f53fb7c0d1b96b7Rodrigo Carceroni/* 230ab3fc173709a491c9e2e103f53fb7c0d1b96b7Rodrigo Carceroni * Copyright (C) 2011 The Android Open Source Project 330ab3fc173709a491c9e2e103f53fb7c0d1b96b7Rodrigo Carceroni * 430ab3fc173709a491c9e2e103f53fb7c0d1b96b7Rodrigo Carceroni * Licensed under the Apache License, Version 2.0 (the "License"); 530ab3fc173709a491c9e2e103f53fb7c0d1b96b7Rodrigo Carceroni * you may not use this file except in compliance with the License. 630ab3fc173709a491c9e2e103f53fb7c0d1b96b7Rodrigo Carceroni * You may obtain a copy of the License at 730ab3fc173709a491c9e2e103f53fb7c0d1b96b7Rodrigo Carceroni * 830ab3fc173709a491c9e2e103f53fb7c0d1b96b7Rodrigo Carceroni * http://www.apache.org/licenses/LICENSE-2.0 930ab3fc173709a491c9e2e103f53fb7c0d1b96b7Rodrigo Carceroni * 1030ab3fc173709a491c9e2e103f53fb7c0d1b96b7Rodrigo Carceroni * Unless required by applicable law or agreed to in writing, software 1130ab3fc173709a491c9e2e103f53fb7c0d1b96b7Rodrigo Carceroni * distributed under the License is distributed on an "AS IS" BASIS, 1230ab3fc173709a491c9e2e103f53fb7c0d1b96b7Rodrigo Carceroni * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 1330ab3fc173709a491c9e2e103f53fb7c0d1b96b7Rodrigo Carceroni * See the License for the specific language governing permissions and 1430ab3fc173709a491c9e2e103f53fb7c0d1b96b7Rodrigo Carceroni * limitations under the License. 1530ab3fc173709a491c9e2e103f53fb7c0d1b96b7Rodrigo Carceroni */ 1630ab3fc173709a491c9e2e103f53fb7c0d1b96b7Rodrigo Carceroni 1730ab3fc173709a491c9e2e103f53fb7c0d1b96b7Rodrigo Carceroni 1830ab3fc173709a491c9e2e103f53fb7c0d1b96b7Rodrigo Carceronipackage android.filterpacks.imageproc; 1930ab3fc173709a491c9e2e103f53fb7c0d1b96b7Rodrigo Carceroni 2030ab3fc173709a491c9e2e103f53fb7c0d1b96b7Rodrigo Carceroniimport android.filterfw.core.Filter; 21692c3bf7a1c7e2d5b1066cf7a1b057e993742c87Marius Rennimport android.filterfw.core.FilterContext; 2230ab3fc173709a491c9e2e103f53fb7c0d1b96b7Rodrigo Carceroniimport android.filterfw.core.Frame; 2330ab3fc173709a491c9e2e103f53fb7c0d1b96b7Rodrigo Carceroniimport android.filterfw.core.FrameFormat; 2430ab3fc173709a491c9e2e103f53fb7c0d1b96b7Rodrigo Carceroniimport android.filterfw.core.KeyValueMap; 2530ab3fc173709a491c9e2e103f53fb7c0d1b96b7Rodrigo Carceroniimport android.filterfw.core.NativeProgram; 2630ab3fc173709a491c9e2e103f53fb7c0d1b96b7Rodrigo Carceroniimport android.filterfw.core.NativeFrame; 2730ab3fc173709a491c9e2e103f53fb7c0d1b96b7Rodrigo Carceroniimport android.filterfw.core.Program; 2830ab3fc173709a491c9e2e103f53fb7c0d1b96b7Rodrigo Carceroniimport android.filterfw.core.ShaderProgram; 2930ab3fc173709a491c9e2e103f53fb7c0d1b96b7Rodrigo Carceroni 3030ab3fc173709a491c9e2e103f53fb7c0d1b96b7Rodrigo Carceroniimport java.util.Set; 3130ab3fc173709a491c9e2e103f53fb7c0d1b96b7Rodrigo Carceroni 32a3bfbe5389c6146abe318a7add3fa688d69bc01bEino-Ville Talvala/** 33a3bfbe5389c6146abe318a7add3fa688d69bc01bEino-Ville Talvala * @hide 34a3bfbe5389c6146abe318a7add3fa688d69bc01bEino-Ville Talvala */ 3521d0ac7403b836e32e2bdbdc8dc98f42b2dfa4e5Marius Rennpublic class ContrastFilter extends SimpleImageFilter { 3630ab3fc173709a491c9e2e103f53fb7c0d1b96b7Rodrigo Carceroni 3721d0ac7403b836e32e2bdbdc8dc98f42b2dfa4e5Marius Renn private static final String mContrastShader = 3830ab3fc173709a491c9e2e103f53fb7c0d1b96b7Rodrigo Carceroni "precision mediump float;\n" + 3930ab3fc173709a491c9e2e103f53fb7c0d1b96b7Rodrigo Carceroni "uniform sampler2D tex_sampler_0;\n" + 4030ab3fc173709a491c9e2e103f53fb7c0d1b96b7Rodrigo Carceroni "uniform float contrast;\n" + 4130ab3fc173709a491c9e2e103f53fb7c0d1b96b7Rodrigo Carceroni "varying vec2 v_texcoord;\n" + 4230ab3fc173709a491c9e2e103f53fb7c0d1b96b7Rodrigo Carceroni "void main() {\n" + 4330ab3fc173709a491c9e2e103f53fb7c0d1b96b7Rodrigo Carceroni " vec4 color = texture2D(tex_sampler_0, v_texcoord);\n" + 4430ab3fc173709a491c9e2e103f53fb7c0d1b96b7Rodrigo Carceroni " color -= 0.5;\n" + 4530ab3fc173709a491c9e2e103f53fb7c0d1b96b7Rodrigo Carceroni " color *= contrast;\n" + 4630ab3fc173709a491c9e2e103f53fb7c0d1b96b7Rodrigo Carceroni " color += 0.5;\n" + 4730ab3fc173709a491c9e2e103f53fb7c0d1b96b7Rodrigo Carceroni " gl_FragColor = color;\n" + // this will clamp 4830ab3fc173709a491c9e2e103f53fb7c0d1b96b7Rodrigo Carceroni "}\n"; 4930ab3fc173709a491c9e2e103f53fb7c0d1b96b7Rodrigo Carceroni 5030ab3fc173709a491c9e2e103f53fb7c0d1b96b7Rodrigo Carceroni public ContrastFilter(String name) { 5121d0ac7403b836e32e2bdbdc8dc98f42b2dfa4e5Marius Renn super(name, "contrast"); 5230ab3fc173709a491c9e2e103f53fb7c0d1b96b7Rodrigo Carceroni } 5330ab3fc173709a491c9e2e103f53fb7c0d1b96b7Rodrigo Carceroni 54c0017fd82acec5d0427306ea5f536c3d78854f95Marius Renn @Override 55511360e61650864ea22a171159efe073c80d0cdbMarius Renn protected Program getNativeProgram(FilterContext context) { 5621d0ac7403b836e32e2bdbdc8dc98f42b2dfa4e5Marius Renn return new NativeProgram("filterpack_imageproc", "contrast"); 5730ab3fc173709a491c9e2e103f53fb7c0d1b96b7Rodrigo Carceroni } 5830ab3fc173709a491c9e2e103f53fb7c0d1b96b7Rodrigo Carceroni 59c0017fd82acec5d0427306ea5f536c3d78854f95Marius Renn @Override 60511360e61650864ea22a171159efe073c80d0cdbMarius Renn protected Program getShaderProgram(FilterContext context) { 61511360e61650864ea22a171159efe073c80d0cdbMarius Renn return new ShaderProgram(context, mContrastShader); 6230ab3fc173709a491c9e2e103f53fb7c0d1b96b7Rodrigo Carceroni } 6330ab3fc173709a491c9e2e103f53fb7c0d1b96b7Rodrigo Carceroni 6430ab3fc173709a491c9e2e103f53fb7c0d1b96b7Rodrigo Carceroni} 65