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
Java_com_android_photoeditor_filters_ImageUtils_nativeTint(JNIEnv * env,jobject obj,jobject src_bitmap,jobject dst_bitmap,jint tint)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
Tint(JNIEnv * env,jobject obj,jobject src_bitmap,jobject dst_bitmap,jint tint)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