| /* |
| * 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.KeyValueMap; |
| import android.filterfw.core.NativeProgram; |
| import android.filterfw.core.NativeFrame; |
| import android.filterfw.core.Program; |
| import android.filterfw.core.ShaderProgram; |
| |
| import java.util.Set; |
| |
| /** |
| * @hide |
| */ |
| public class ContrastFilter extends SimpleImageFilter { |
| |
| private static final String mContrastShader = |
| "precision mediump float;\n" + |
| "uniform sampler2D tex_sampler_0;\n" + |
| "uniform float contrast;\n" + |
| "varying vec2 v_texcoord;\n" + |
| "void main() {\n" + |
| " vec4 color = texture2D(tex_sampler_0, v_texcoord);\n" + |
| " color -= 0.5;\n" + |
| " color *= contrast;\n" + |
| " color += 0.5;\n" + |
| " gl_FragColor = color;\n" + // this will clamp |
| "}\n"; |
| |
| public ContrastFilter(String name) { |
| super(name, "contrast"); |
| } |
| |
| @Override |
| protected Program getNativeProgram(FilterContext context) { |
| return new NativeProgram("filterpack_imageproc", "contrast"); |
| } |
| |
| @Override |
| protected Program getShaderProgram(FilterContext context) { |
| return new ShaderProgram(context, mContrastShader); |
| } |
| |
| } |