10f51f144dba401346c0078334f00f9e44d4146e5David Smith/* 20f51f144dba401346c0078334f00f9e44d4146e5David Smith * Copyright (C) 2014 The Android Open Source Project 30f51f144dba401346c0078334f00f9e44d4146e5David Smith * 40f51f144dba401346c0078334f00f9e44d4146e5David Smith * Licensed under the Apache License, Version 2.0 (the "License"); 50f51f144dba401346c0078334f00f9e44d4146e5David Smith * you may not use this file except in compliance with the License. 60f51f144dba401346c0078334f00f9e44d4146e5David Smith * You may obtain a copy of the License at 70f51f144dba401346c0078334f00f9e44d4146e5David Smith * 80f51f144dba401346c0078334f00f9e44d4146e5David Smith * http://www.apache.org/licenses/LICENSE-2.0 90f51f144dba401346c0078334f00f9e44d4146e5David Smith * 100f51f144dba401346c0078334f00f9e44d4146e5David Smith * Unless required by applicable law or agreed to in writing, software 110f51f144dba401346c0078334f00f9e44d4146e5David Smith * distributed under the License is distributed on an "AS IS" BASIS, 120f51f144dba401346c0078334f00f9e44d4146e5David Smith * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 130f51f144dba401346c0078334f00f9e44d4146e5David Smith * See the License for the specific language governing permissions and 140f51f144dba401346c0078334f00f9e44d4146e5David Smith * limitations under the License. 150f51f144dba401346c0078334f00f9e44d4146e5David Smith */ 160f51f144dba401346c0078334f00f9e44d4146e5David Smith 170f51f144dba401346c0078334f00f9e44d4146e5David Smith#pragma version(1) 180f51f144dba401346c0078334f00f9e44d4146e5David Smith#pragma rs java_package_name(com.android.rs.cppbasic) 190f51f144dba401346c0078334f00f9e44d4146e5David Smith#pragma rs_fp_relaxed 200f51f144dba401346c0078334f00f9e44d4146e5David Smith 210f51f144dba401346c0078334f00f9e44d4146e5David Smithconst static float3 gMonoMult = {0.299f, 0.587f, 0.114f}; 220f51f144dba401346c0078334f00f9e44d4146e5David Smith 230f51f144dba401346c0078334f00f9e44d4146e5David Smith// global variables (parameters accessible to application code) 240f51f144dba401346c0078334f00f9e44d4146e5David Smithfloat gSaturation = 1.0f; 250f51f144dba401346c0078334f00f9e44d4146e5David Smith 260f51f144dba401346c0078334f00f9e44d4146e5David Smithvoid root(const uchar4 *v_in, uchar4 *v_out) { 270f51f144dba401346c0078334f00f9e44d4146e5David Smith v_out->x = v_in->x; // don't modify A 280f51f144dba401346c0078334f00f9e44d4146e5David Smith 290f51f144dba401346c0078334f00f9e44d4146e5David Smith // get RGB, scale 0-255 uchar to 0-1.0 float 300f51f144dba401346c0078334f00f9e44d4146e5David Smith float3 rgb = {v_in->y * 0.003921569f, v_in->z * 0.003921569f, 310f51f144dba401346c0078334f00f9e44d4146e5David Smith v_in->w * 0.003921569f}; 320f51f144dba401346c0078334f00f9e44d4146e5David Smith 330f51f144dba401346c0078334f00f9e44d4146e5David Smith // apply saturation filter 340f51f144dba401346c0078334f00f9e44d4146e5David Smith float3 result = dot(rgb, gMonoMult); 350f51f144dba401346c0078334f00f9e44d4146e5David Smith result = mix(result, rgb, gSaturation); 360f51f144dba401346c0078334f00f9e44d4146e5David Smith 370f51f144dba401346c0078334f00f9e44d4146e5David Smith v_out->y = (uchar)clamp((result.r * 255.f + 0.5f), 0.f, 255.f); 380f51f144dba401346c0078334f00f9e44d4146e5David Smith v_out->z = (uchar)clamp((result.g * 255.f + 0.5f), 0.f, 255.f); 390f51f144dba401346c0078334f00f9e44d4146e5David Smith v_out->w = (uchar)clamp((result.b * 255.f + 0.5f), 0.f, 255.f); 400f51f144dba401346c0078334f00f9e44d4146e5David Smith} 41