Home | History | Annotate | Download | only in jni 
      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_nativeCrossProcess(
     30     JNIEnv *env, jobject obj, jobject src_bitmap, jobject dst_bitmap) {
     31    pCrossProcessType f = (pCrossProcessType)JNIFunc[JNI_CrossProcess].func_ptr;
     32    return f(env, obj, src_bitmap, dst_bitmap);
     33 }
     34 
     35 extern "C" void CrossProcess(
     36     JNIEnv *env, jobject obj, jobject src_bitmap, jobject dst_bitmap) {
     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 Crossprocess failed, error=%d", ret);
     46     return;
     47   }
     48 
     49   const int k128SquareDouble = 32768;  // 2 * 128^2
     50   const int k128CubicDouble = 4194304;  // 2 * 128^3
     51   for (uint32_t scan_line = 0; scan_line < dst_info.height; scan_line++) {
     52     uint32_t* dst = reinterpret_cast<uint32_t*>(dst_pixels);
     53     pixel32_t* src = reinterpret_cast<pixel32_t*>(src_pixels);
     54     pixel32_t* src_line_end = src + src_info.width;
     55 
     56     while (src < src_line_end) {
     57       // Enhance red contrast
     58       uint32_t r = src->rgba8[0];
     59       uint32_t dst_red;
     60       if (r <= 128) {
     61         dst_red = 255 * r * r * r / k128CubicDouble;
     62       } else {
     63         uint32_t diff_r = 255 - r;
     64         dst_red = 255 - 255 * diff_r * diff_r * diff_r / k128CubicDouble;
     65       }
     66       // Enhance green contrast
     67       int g = src->rgba8[1];
     68       uint32_t dst_green;
     69       if (g <= 128) {
     70         dst_green = 255 * g * g / k128SquareDouble;
     71       } else {
     72         int diff_g = 255 - g;
     73         dst_green = 255 - 255 * diff_g * diff_g / k128SquareDouble;
     74       }
     75       // Narrow the blue channel, from 64 to 192.
     76       int dst_blue = src->rgba8[2] * 128 / 255 + 64;
     77 
     78       *dst = (src->rgba8[3] << 24) | (dst_blue << 16) | (dst_green << 8) | dst_red;
     79       dst++;
     80       src++;
     81     }
     82     dst_pixels = reinterpret_cast<char*>(dst_pixels) + dst_info.stride;
     83     src_pixels = reinterpret_cast<char*>(src_pixels) + src_info.stride;
     84   }
     85 
     86   UnlockBitmaps(env, src_bitmap, dst_bitmap);
     87 }
     88 
     89 }  // namespace
     90