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 "utils.h" 21 #include "_jni.h" 22 23 using android::apps::photoeditor::utils::LockBitmaps; 24 using android::apps::photoeditor::utils::pixel32_t; 25 using android::apps::photoeditor::utils::UnlockBitmaps; 26 27 namespace { 28 29 extern "C" JNIEXPORT void JNICALL Java_com_android_photoeditor_filters_ImageUtils_nativeGrayscale( 30 JNIEnv *env, jobject obj, jobject src_bitmap, jobject dst_bitmap, jfloat scale) { 31 pGrayscaleType f = (pGrayscaleType)JNIFunc[JNI_Grayscale].func_ptr; 32 return f(env, obj, src_bitmap, dst_bitmap, scale); 33 } 34 35 extern "C" void Grayscale( 36 JNIEnv *env, jobject obj, jobject src_bitmap, jobject dst_bitmap, jfloat scale) { 37 AndroidBitmapInfo src_info; 38 AndroidBitmapInfo dst_info; 39 void* src_pixels; 40 void* dst_pixels; 41 42 int ret = LockBitmaps( 43 env, src_bitmap, dst_bitmap, &src_info, &dst_info, &src_pixels, &dst_pixels); 44 if (ret < 0) { 45 LOGE("LockBitmaps in GrayScale failed, error=%d", ret); 46 return; 47 } 48 49 const int kShiftBits = 20; 50 const int32_t kRedRatio = static_cast<int32_t>((1 << kShiftBits) * 0.21f); 51 const int32_t kGreenRatio = static_cast<int32_t>((1 << kShiftBits) * 0.71f); 52 const int32_t kBlueRatio = static_cast<int32_t>((1 << kShiftBits) * 0.07f); 53 54 for (uint32_t scan_line = 0; scan_line < dst_info.height; scan_line++) { 55 uint32_t* dst = reinterpret_cast<uint32_t*>(dst_pixels); 56 pixel32_t* src = reinterpret_cast<pixel32_t*>(src_pixels); 57 pixel32_t* src_line_end = src + src_info.width; 58 while (src < src_line_end) { 59 int32_t src_red = src->rgba8[0]; 60 int32_t src_green = src->rgba8[1]; 61 int32_t src_blue = src->rgba8[2]; 62 int32_t src_alpha = src->rgba8[3]; 63 64 int32_t dst_color = (kRedRatio * src_red + kGreenRatio * src_green + 65 kBlueRatio * src_blue) >> kShiftBits; 66 if (dst_color > 255) { 67 dst_color = 255; 68 } 69 *dst = (src_alpha << 24) | (dst_color << 16) | (dst_color << 8) | dst_color; 70 dst++; 71 src++; 72 } 73 dst_pixels = reinterpret_cast<char*>(dst_pixels) + dst_info.stride; 74 src_pixels = reinterpret_cast<char*>(src_pixels) + src_info.stride; 75 } 76 77 UnlockBitmaps(env, src_bitmap, dst_bitmap); 78 } 79 80 } // namespace 81
