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