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      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_nativeTint(
     30     JNIEnv *env, jobject obj, jobject src_bitmap, jobject dst_bitmap, jint tint) {
     31    pTintType f = (pTintType)JNIFunc[JNI_Tint].func_ptr;
     32    return f(env, obj, src_bitmap, dst_bitmap, tint);
     33 }
     34 
     35 extern "C" void Tint(
     36     JNIEnv *env, jobject obj, jobject src_bitmap, jobject dst_bitmap, jint tint) {
     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 Tint failed, error=%d", ret);
     46     return;
     47   }
     48 
     49   const int kShiftBits = 10;
     50   const int kRedRatio = static_cast<int>(0.8f * (1 << kShiftBits) * 0.21f);
     51   const int kGreenRatio = static_cast<int>(0.8f * (1 << kShiftBits) * 0.71f);
     52   const int kBlueRatio = static_cast<int>(0.8f * (1 << kShiftBits) * 0.07f);
     53   const int kTintRatio = static_cast<int>(0.2f * (1 << kShiftBits));
     54 
     55   uint32_t tint_red = kTintRatio * ((tint >> 16) & 0xff);
     56   uint32_t tint_green = kTintRatio * ((tint >> 8) & 0xff);
     57   uint32_t tint_blue = kTintRatio * (tint & 0xff);
     58 
     59   for (uint32_t scan_line = 0; scan_line < dst_info.height; scan_line++) {
     60     uint32_t* dst = reinterpret_cast<uint32_t*>(dst_pixels);
     61     pixel32_t* src = reinterpret_cast<pixel32_t*>(src_pixels);
     62     pixel32_t* src_line_end = src + src_info.width;
     63     while (src < src_line_end) {
     64       int32_t avg = kRedRatio * src->rgba8[0] + kGreenRatio * src->rgba8[1] +
     65           kBlueRatio * src->rgba8[2];
     66 
     67       int32_t dst_red = (avg + tint_red) >> kShiftBits;
     68       int32_t dst_green = (avg + tint_green) >> kShiftBits;
     69       int32_t dst_blue = (avg + tint_blue) >> kShiftBits;
     70 
     71       if (dst_red > 255) {
     72         dst_red = 255;
     73       }
     74       if (dst_green > 255) {
     75         dst_green = 255;
     76       }
     77       if (dst_blue > 255) {
     78         dst_blue = 255;
     79       }
     80 
     81       *dst = (src->rgba8[3] << 24) | (dst_blue << 16) | (dst_green << 8) | dst_red;
     82       dst++;
     83       src++;
     84     }
     85     dst_pixels = reinterpret_cast<char*>(dst_pixels) + dst_info.stride;
     86     src_pixels = reinterpret_cast<char*>(src_pixels) + src_info.stride;
     87   }
     88 
     89   UnlockBitmaps(env, src_bitmap, dst_bitmap);
     90 }
     91 
     92 }  // namespace
     93