1 /* 2 * Copyright (C) 2010 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 <android/bitmap.h> 18 #include <jni.h> 19 20 #include <cmath> 21 22 #include "utils.h" 23 #include "_jni.h" 24 25 using android::apps::photoeditor::utils::LockBitmaps; 26 using android::apps::photoeditor::utils::pixel32_t; 27 using android::apps::photoeditor::utils::UnlockBitmaps; 28 29 namespace { 30 31 /** 32 * @param range the position of the significant falloff of light (50% luminosity). 33 */ 34 extern "C" JNIEXPORT void JNICALL Java_com_android_photoeditor_filters_ImageUtils_nativeVignetting( 35 JNIEnv *env, jobject obj, jobject src_bitmap, jobject dst_bitmap, jfloat range) { 36 pVignettingType f = (pVignettingType)JNIFunc[JNI_Vignetting].func_ptr; 37 return f(env, obj, src_bitmap, dst_bitmap, range); 38 } 39 40 extern "C" void Vignetting( 41 JNIEnv *env, jobject obj, jobject src_bitmap, jobject dst_bitmap, jfloat range) { 42 AndroidBitmapInfo src_info; 43 AndroidBitmapInfo dst_info; 44 void* src_pixels; 45 void* dst_pixels; 46 47 const float slope = 20.0f; // how fast the light changes, the bigger the faster. 48 range *= slope; 49 const int kShiftBits = 10; 50 const uint32_t shade = 0.85 * (1 << kShiftBits); // the intensity of the shade 51 const uint32_t shade_offset = (1 << kShiftBits) - shade; 52 53 int ret = LockBitmaps( 54 env, src_bitmap, dst_bitmap, &src_info, &dst_info, &src_pixels, &dst_pixels); 55 if (ret < 0) { 56 LOGE("LockBitmaps in Vignetting failed, error=%d", ret); 57 return; 58 } 59 60 const uint32_t center_x = src_info.width / 2; 61 const uint32_t center_y = src_info.height / 2; 62 const uint32_t hypot = sqrt(center_x * center_x + center_y * center_y) / slope; 63 64 for (uint32_t dst_y = 0; dst_y < dst_info.height; dst_y++) { 65 uint32_t *dst = reinterpret_cast<uint32_t*>( 66 reinterpret_cast<char*>(dst_pixels) + dst_info.stride * dst_y); 67 pixel32_t *src = reinterpret_cast<pixel32_t*>( 68 reinterpret_cast<char*>(src_pixels) + src_info.stride * dst_y); 69 int dy = dst_y - center_y; 70 for (uint32_t dst_x = 0; dst_x < dst_info.width; dst_x++) { 71 int dx = dst_x - center_x; 72 int dist_square = dx * dx + dy * dy; 73 uint32_t luminousity = shade / (1 + exp(sqrt(dist_square) / hypot - range)) + 74 shade_offset; 75 uint32_t red = (luminousity * src->rgba8[0]) >> kShiftBits; 76 uint32_t green = (luminousity * src->rgba8[1]) >> kShiftBits; 77 uint32_t blue = (luminousity * src->rgba8[2]) >> kShiftBits; 78 uint32_t alpha = src->rgba8[3]; 79 *dst = (alpha << 24) | (blue << 16) | (green << 8) | red; 80 dst++; 81 src++; 82 } // dst_x 83 } // dst_y 84 85 UnlockBitmaps(env, src_bitmap, dst_bitmap); 86 } 87 88 } // namespace 89
