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 const int k256Multiply255 = 65280;
30
31 /*
32 * @param scale ranges from -0.5 to 0.5.
33 */
Java_com_android_photoeditor_filters_ImageUtils_nativeColorTemp(JNIEnv * env,jobject obj,jobject src_bitmap,jobject dst_bitmap,jfloat scale)34 extern "C" JNIEXPORT void JNICALL Java_com_android_photoeditor_filters_ImageUtils_nativeColorTemp(
35 JNIEnv *env, jobject obj, jobject src_bitmap, jobject dst_bitmap, jfloat scale) {
36 pColorTempType f = (pColorTempType)JNIFunc[JNI_ColorTemp].func_ptr;
37 return f(env, obj, src_bitmap, dst_bitmap, scale);
38 }
39
ColorTemp(JNIEnv * env,jobject obj,jobject src_bitmap,jobject dst_bitmap,jfloat scale)40 extern "C" void ColorTemp(
41 JNIEnv *env, jobject obj, jobject src_bitmap, jobject dst_bitmap, jfloat scale) {
42 AndroidBitmapInfo src_info;
43 AndroidBitmapInfo dst_info;
44 void* src_pixels;
45 void* dst_pixels;
46
47 int ret = LockBitmaps(
48 env, src_bitmap, dst_bitmap, &src_info, &dst_info, &src_pixels, &dst_pixels);
49 if (ret < 0) {
50 LOGE("LockBitmaps in ColorTemp failed, error=%d", ret);
51 return;
52 }
53
54 int curve[256];
55 for (int i = 0; i < 256; i++) {
56 curve[i] = i * (256 - i);
57 }
58
59 int ics = static_cast<int>(scale * 256);
60 int icsr = ics;
61 int icsg = ics > 0 ? ics : 0;
62 int icsb = ics;
63
64 for (uint32_t scan_line = 0; scan_line < dst_info.height; scan_line++) {
65 uint32_t* dst = reinterpret_cast<uint32_t*>(dst_pixels);
66 pixel32_t* src = reinterpret_cast<pixel32_t*>(src_pixels);
67 pixel32_t* src_line_end = src + src_info.width;
68
69 while (src < src_line_end) {
70 int32_t src_red = src->rgba8[0];
71 int32_t src_green = src->rgba8[1];
72 int32_t src_blue = src->rgba8[2];
73 int32_t src_alpha = src->rgba8[3];
74
75 int32_t dst_red = src_red + ((curve[src_red] * icsr) >> 15);
76 int32_t dst_green = src_green + ((curve[src_green] * icsg) >> 17);
77 int32_t dst_blue = src_blue - ((curve[src_blue] * icsb) >> 15);
78
79 int rgb_max = MAX3(dst_red, dst_green, dst_blue);
80 if (rgb_max > 255) {
81 int invmax = k256Multiply255 / rgb_max;
82 dst_red = dst_red * invmax >> 8;
83 dst_green = dst_green * invmax >> 8;
84 dst_blue = dst_blue * invmax >> 8;
85 }
86
87 *dst = (src_alpha << 24) | (dst_blue << 16) | (dst_green << 8) | dst_red;
88 dst++;
89 src++;
90 }
91 dst_pixels = reinterpret_cast<char*>(dst_pixels) + dst_info.stride;
92 src_pixels = reinterpret_cast<char*>(src_pixels) + src_info.stride;
93 }
94
95 UnlockBitmaps(env, src_bitmap, dst_bitmap);
96 }
97
98 } // namespace
99