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 const int k256Multiply255 = 65280; 30 31 /* 32 * @param scale ranges from -0.5 to 0.5. 33 */ 34 extern "C" JNIEXPORT void JNICALL Java_com_android_photoeditor_filters_ImageUtils_nativeColorTemp( 35 JNIEnv *env, jobject obj, jobject src_bitmap, jobject dst_bitmap, jfloat scale) { 36 pColorTempType f = (pColorTempType)JNIFunc[JNI_ColorTemp].func_ptr; 37 return f(env, obj, src_bitmap, dst_bitmap, scale); 38 } 39 40 extern "C" void ColorTemp( 41 JNIEnv *env, jobject obj, jobject src_bitmap, jobject dst_bitmap, jfloat scale) { 42 AndroidBitmapInfo src_info; 43 AndroidBitmapInfo dst_info; 44 void* src_pixels; 45 void* dst_pixels; 46 47 int ret = LockBitmaps( 48 env, src_bitmap, dst_bitmap, &src_info, &dst_info, &src_pixels, &dst_pixels); 49 if (ret < 0) { 50 LOGE("LockBitmaps in ColorTemp failed, error=%d", ret); 51 return; 52 } 53 54 int curve[256]; 55 for (int i = 0; i < 256; i++) { 56 curve[i] = i * (256 - i); 57 } 58 59 int ics = static_cast<int>(scale * 256); 60 int icsr = ics; 61 int icsg = ics > 0 ? ics : 0; 62 int icsb = ics; 63 64 for (uint32_t scan_line = 0; scan_line < dst_info.height; scan_line++) { 65 uint32_t* dst = reinterpret_cast<uint32_t*>(dst_pixels); 66 pixel32_t* src = reinterpret_cast<pixel32_t*>(src_pixels); 67 pixel32_t* src_line_end = src + src_info.width; 68 69 while (src < src_line_end) { 70 int32_t src_red = src->rgba8[0]; 71 int32_t src_green = src->rgba8[1]; 72 int32_t src_blue = src->rgba8[2]; 73 int32_t src_alpha = src->rgba8[3]; 74 75 int32_t dst_red = src_red + ((curve[src_red] * icsr) >> 15); 76 int32_t dst_green = src_green + ((curve[src_green] * icsg) >> 17); 77 int32_t dst_blue = src_blue - ((curve[src_blue] * icsb) >> 15); 78 79 int rgb_max = MAX3(dst_red, dst_green, dst_blue); 80 if (rgb_max > 255) { 81 int invmax = k256Multiply255 / rgb_max; 82 dst_red = dst_red * invmax >> 8; 83 dst_green = dst_green * invmax >> 8; 84 dst_blue = dst_blue * invmax >> 8; 85 } 86 87 *dst = (src_alpha << 24) | (dst_blue << 16) | (dst_green << 8) | dst_red; 88 dst++; 89 src++; 90 } 91 dst_pixels = reinterpret_cast<char*>(dst_pixels) + dst_info.stride; 92 src_pixels = reinterpret_cast<char*>(src_pixels) + src_info.stride; 93 } 94 95 UnlockBitmaps(env, src_bitmap, dst_bitmap); 96 } 97 98 } // namespace 99
