1d42f6c69c5980110c16cd679f914c4e4e7caa29dJohn Hoford/* 2d42f6c69c5980110c16cd679f914c4e4e7caa29dJohn Hoford * Copyright (C) 2012 The Android Open Source Project 3d42f6c69c5980110c16cd679f914c4e4e7caa29dJohn Hoford * 4d42f6c69c5980110c16cd679f914c4e4e7caa29dJohn Hoford * Licensed under the Apache License, Version 2.0 (the "License"); 5d42f6c69c5980110c16cd679f914c4e4e7caa29dJohn Hoford * you may not use this file except in compliance with the License. 6d42f6c69c5980110c16cd679f914c4e4e7caa29dJohn Hoford * You may obtain a copy of the License at 7d42f6c69c5980110c16cd679f914c4e4e7caa29dJohn Hoford * 8d42f6c69c5980110c16cd679f914c4e4e7caa29dJohn Hoford * http://www.apache.org/licenses/LICENSE-2.0 9d42f6c69c5980110c16cd679f914c4e4e7caa29dJohn Hoford * 10d42f6c69c5980110c16cd679f914c4e4e7caa29dJohn Hoford * Unless required by applicable law or agreed to in writing, software 11d42f6c69c5980110c16cd679f914c4e4e7caa29dJohn Hoford * distributed under the License is distributed on an "AS IS" BASIS, 12d42f6c69c5980110c16cd679f914c4e4e7caa29dJohn Hoford * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13d42f6c69c5980110c16cd679f914c4e4e7caa29dJohn Hoford * See the License for the specific language governing permissions and 14d42f6c69c5980110c16cd679f914c4e4e7caa29dJohn Hoford * limitations under the License. 15d42f6c69c5980110c16cd679f914c4e4e7caa29dJohn Hoford */ 16d42f6c69c5980110c16cd679f914c4e4e7caa29dJohn Hoford 17bf97d3aaeddfba06f6a00ee7abb23fcd28eb2e7dJohn Hoford#include <math.h> 18d42f6c69c5980110c16cd679f914c4e4e7caa29dJohn Hoford#include "filters.h" 19d42f6c69c5980110c16cd679f914c4e4e7caa29dJohn Hoford 20d42f6c69c5980110c16cd679f914c4e4e7caa29dJohn Hofordunsigned char clamp(int c) 21d42f6c69c5980110c16cd679f914c4e4e7caa29dJohn Hoford{ 22d42f6c69c5980110c16cd679f914c4e4e7caa29dJohn Hoford int N = 255; 23d42f6c69c5980110c16cd679f914c4e4e7caa29dJohn Hoford c &= ~(c >> 31); 24d42f6c69c5980110c16cd679f914c4e4e7caa29dJohn Hoford c -= N; 25d42f6c69c5980110c16cd679f914c4e4e7caa29dJohn Hoford c &= (c >> 31); 26d42f6c69c5980110c16cd679f914c4e4e7caa29dJohn Hoford c += N; 27d42f6c69c5980110c16cd679f914c4e4e7caa29dJohn Hoford return (unsigned char) c; 28d42f6c69c5980110c16cd679f914c4e4e7caa29dJohn Hoford} 29d42f6c69c5980110c16cd679f914c4e4e7caa29dJohn Hoford 30d42f6c69c5980110c16cd679f914c4e4e7caa29dJohn Hofordvoid JNIFUNCF(ImageFilterContrast, nativeApplyFilter, jobject bitmap, jint width, jint height, jfloat bright) 31d42f6c69c5980110c16cd679f914c4e4e7caa29dJohn Hoford{ 32d42f6c69c5980110c16cd679f914c4e4e7caa29dJohn Hoford char* destination = 0; 33d42f6c69c5980110c16cd679f914c4e4e7caa29dJohn Hoford AndroidBitmap_lockPixels(env, bitmap, (void**) &destination); 34d42f6c69c5980110c16cd679f914c4e4e7caa29dJohn Hoford unsigned char * rgb = (unsigned char * )destination; 35d42f6c69c5980110c16cd679f914c4e4e7caa29dJohn Hoford int i; 36d42f6c69c5980110c16cd679f914c4e4e7caa29dJohn Hoford int len = width * height * 4; 37d42f6c69c5980110c16cd679f914c4e4e7caa29dJohn Hoford float m = (float)pow(2, bright/100.); 38d42f6c69c5980110c16cd679f914c4e4e7caa29dJohn Hoford float c = 127-m*127; 39d42f6c69c5980110c16cd679f914c4e4e7caa29dJohn Hoford 40d42f6c69c5980110c16cd679f914c4e4e7caa29dJohn Hoford for (i = 0; i < len; i+=4) { 41d42f6c69c5980110c16cd679f914c4e4e7caa29dJohn Hoford rgb[RED] = clamp((int)(m*rgb[RED]+c)); 42d42f6c69c5980110c16cd679f914c4e4e7caa29dJohn Hoford rgb[GREEN] = clamp((int)(m*rgb[GREEN]+c)); 43d42f6c69c5980110c16cd679f914c4e4e7caa29dJohn Hoford rgb[BLUE] = clamp((int)(m*rgb[BLUE]+c)); 44d42f6c69c5980110c16cd679f914c4e4e7caa29dJohn Hoford } 45d42f6c69c5980110c16cd679f914c4e4e7caa29dJohn Hoford AndroidBitmap_unlockPixels(env, bitmap); 46d42f6c69c5980110c16cd679f914c4e4e7caa29dJohn Hoford} 47d42f6c69c5980110c16cd679f914c4e4e7caa29dJohn Hoford 48