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
23using android::apps::photoeditor::utils::LockBitmaps;
24using android::apps::photoeditor::utils::pixel32_t;
25using android::apps::photoeditor::utils::UnlockBitmaps;
26
27namespace {
28
29extern "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
35extern "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