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 // Native function to extract histogram from image (handed down as ByteBuffer). 18 19 #include "frametovalues.h" 20 21 #include <string.h> 22 #include <jni.h> 23 #include <unistd.h> 24 #include <android/log.h> 25 26 #include "imgprocutil.h" 27 28 jboolean Java_androidx_media_filterpacks_image_ToGrayValuesFilter_toGrayValues( 29 JNIEnv* env, jclass clazz, jobject imageBuffer, jobject grayBuffer ) 30 { 31 unsigned char* pixelPtr = static_cast<unsigned char*>(env->GetDirectBufferAddress(imageBuffer)); 32 unsigned char* grayPtr = static_cast<unsigned char*>(env->GetDirectBufferAddress(grayBuffer)); 33 34 if (pixelPtr == 0 || grayPtr == 0) { 35 return JNI_FALSE; 36 } 37 38 int numPixels = env->GetDirectBufferCapacity(imageBuffer) / 4; 39 40 // TODO: the current implementation is focused on the correctness not performance. 41 // If performance becomes an issue, it is better to increment pixelPtr directly. 42 int disp = 0; 43 for(int idx = 0; idx < numPixels; idx++, disp+=4) { 44 int R = *(pixelPtr + disp); 45 int G = *(pixelPtr + disp + 1); 46 int B = *(pixelPtr + disp + 2); 47 int gray = getIntensityFast(R, G, B); 48 *(grayPtr+idx) = static_cast<unsigned char>(gray); 49 } 50 51 return JNI_TRUE; 52 } 53 54 jboolean Java_androidx_media_filterpacks_image_ToRgbValuesFilter_toRgbValues( 55 JNIEnv* env, jclass clazz, jobject imageBuffer, jobject rgbBuffer ) 56 { 57 unsigned char* pixelPtr = static_cast<unsigned char*>(env->GetDirectBufferAddress(imageBuffer)); 58 unsigned char* rgbPtr = static_cast<unsigned char*>(env->GetDirectBufferAddress(rgbBuffer)); 59 60 if (pixelPtr == 0 || rgbPtr == 0) { 61 return JNI_FALSE; 62 } 63 64 int numPixels = env->GetDirectBufferCapacity(imageBuffer) / 4; 65 66 // TODO: this code could be revised to improve the performance as the TODO above. 67 int pixelDisp = 0; 68 int rgbDisp = 0; 69 for(int idx = 0; idx < numPixels; idx++, pixelDisp += 4, rgbDisp += 3) { 70 for (int c = 0; c < 3; ++c) { 71 *(rgbPtr + rgbDisp + c) = *(pixelPtr + pixelDisp + c); 72 } 73 } 74 return JNI_TRUE; 75 } 76 77
