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 #include <cstdlib> 22 #include <ctime> 23 24 #include "utils.h" 25 #include "_jni.h" 26 27 using android::apps::photoeditor::utils::clamp; 28 using android::apps::photoeditor::utils::LockBitmaps; 29 using android::apps::photoeditor::utils::pixel32_t; 30 using android::apps::photoeditor::utils::UnlockBitmaps; 31 32 namespace { 33 34 const int k256Multiply255 = 65280; 35 36 void WhiteblackXF(float white, float black, int xform[]) { 37 float scale = (black != white) ? 1.0f / (white - black) : 2000.0f; 38 float offset = k256Multiply255 * black; 39 for (int i = 0; i < 256; i++) { 40 float vgamma = (256.0f * i - offset) * scale; 41 xform[i] = clamp(floor(vgamma), 0, k256Multiply255); 42 } 43 xform[256] = xform[255]; 44 } 45 46 extern "C" JNIEXPORT void JNICALL Java_com_android_photoeditor_filters_ImageUtils_nativeWhiteBlack( 47 JNIEnv *env, jobject obj, jobject src_bitmap, jobject dst_bitmap, jfloat white, jfloat black) { 48 pWhiteBlackType f = (pWhiteBlackType)JNIFunc[JNI_WhiteBlack].func_ptr; 49 return f(env, obj, src_bitmap, dst_bitmap, white, black); 50 } 51 52 extern "C" void WhiteBlack( 53 JNIEnv *env, jobject obj, jobject src_bitmap, jobject dst_bitmap, jfloat white, jfloat black) { 54 AndroidBitmapInfo src_info; 55 AndroidBitmapInfo dst_info; 56 void* src_pixels; 57 void* dst_pixels; 58 59 int ret = LockBitmaps( 60 env, src_bitmap, dst_bitmap, &src_info, &dst_info, &src_pixels, &dst_pixels); 61 if (ret < 0) { 62 LOGE("LockBitmaps in WhiteBlack failed, error=%d", ret); 63 return; 64 } 65 66 srandom(time(NULL)); 67 68 int xform[257]; 69 WhiteblackXF(white, black, xform); 70 71 for (uint32_t scan_line = 0; scan_line < src_info.height; scan_line++) { 72 pixel32_t* src = reinterpret_cast<pixel32_t*>(src_pixels); 73 uint32_t* dst = reinterpret_cast<uint32_t*>(dst_pixels); 74 pixel32_t* src_line_end = src + src_info.width; 75 while (src < src_line_end) { 76 int32_t red = src->rgba8[0]; 77 int32_t green = src->rgba8[1]; 78 int32_t blue = src->rgba8[2]; 79 int32_t alpha = src->rgba8[3]; 80 81 int32_t xform_red = xform[red]; 82 int32_t xform_green = xform[green]; 83 int32_t xform_blue = xform[blue]; 84 85 red = xform[red + 1] - xform_red; 86 green = xform[green + 1] - xform_green; 87 blue = xform[blue + 1] - xform_blue; 88 89 int32_t dither = random() % 256; 90 int32_t diff_red = red * dither >> 8; 91 int32_t diff_green = green * dither >> 8; 92 int32_t diff_blue = blue * dither >> 8; 93 94 red = (xform_red + diff_red - (red >> 1)) >> 8; 95 green = (xform_green + diff_green - (green >> 1)) >> 8; 96 blue = (xform_blue + diff_blue - (blue >> 1)) >> 8; 97 98 red = clamp(red, 0, 255); 99 green = clamp(green, 0, 255); 100 blue = clamp(blue, 0, 255); 101 102 *dst = (alpha << 24) | (blue << 16) | (green << 8) | red; 103 src++; 104 dst++; 105 } 106 src_pixels = reinterpret_cast<char*>(src_pixels) + src_info.stride; 107 dst_pixels = reinterpret_cast<char*>(dst_pixels) + dst_info.stride; 108 } 109 110 UnlockBitmaps(env, src_bitmap, dst_bitmap); 111 } 112 113 } // namespace 114
