1 /*
2  * Copyright 2016 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 <ui/HdrCapabilities.h>
18 
19 namespace android {
20 
21 #if defined(__clang__)
22 #pragma clang diagnostic push
23 #pragma clang diagnostic ignored "-Wundefined-reinterpret-cast"
24 #endif
25 
26 HdrCapabilities::~HdrCapabilities() = default;
27 HdrCapabilities::HdrCapabilities(HdrCapabilities&& other) noexcept = default;
28 HdrCapabilities& HdrCapabilities::operator=(HdrCapabilities&& other) noexcept = default;
29 
getFlattenedSize() const30 size_t HdrCapabilities::getFlattenedSize() const {
31     return  sizeof(mMaxLuminance) +
32             sizeof(mMaxAverageLuminance) +
33             sizeof(mMinLuminance) +
34             sizeof(int32_t) +
35             mSupportedHdrTypes.size() * sizeof(ui::Hdr);
36 }
37 
flatten(void * buffer,size_t size) const38 status_t HdrCapabilities::flatten(void* buffer, size_t size) const {
39 
40     if (size < getFlattenedSize()) {
41         return NO_MEMORY;
42     }
43 
44     int32_t* const buf = static_cast<int32_t*>(buffer);
45     reinterpret_cast<float&>(buf[0]) = mMaxLuminance;
46     reinterpret_cast<float&>(buf[1]) = mMaxAverageLuminance;
47     reinterpret_cast<float&>(buf[2]) = mMinLuminance;
48     buf[3] = static_cast<int32_t>(mSupportedHdrTypes.size());
49     for (size_t i = 0, c = mSupportedHdrTypes.size(); i < c; ++i) {
50         buf[4 + i] = static_cast<int32_t>(mSupportedHdrTypes[i]);
51     }
52     return NO_ERROR;
53 }
54 
unflatten(void const * buffer,size_t size)55 status_t HdrCapabilities::unflatten(void const* buffer, size_t size) {
56 
57     size_t minSize = sizeof(mMaxLuminance) +
58                      sizeof(mMaxAverageLuminance) +
59                      sizeof(mMinLuminance) +
60                      sizeof(int32_t);
61 
62     if (size < minSize) {
63         return NO_MEMORY;
64     }
65 
66     int32_t const * const buf = static_cast<int32_t const *>(buffer);
67     const size_t itemCount = size_t(buf[3]);
68 
69     // check the buffer is large enough
70     if (size < minSize + itemCount * sizeof(int32_t)) {
71         return BAD_VALUE;
72     }
73 
74     mMaxLuminance        = reinterpret_cast<float const&>(buf[0]);
75     mMaxAverageLuminance = reinterpret_cast<float const&>(buf[1]);
76     mMinLuminance        = reinterpret_cast<float const&>(buf[2]);
77     if (itemCount) {
78         mSupportedHdrTypes.resize(itemCount);
79         for (size_t i = 0; i < itemCount; ++i) {
80             mSupportedHdrTypes[i] = static_cast<ui::Hdr>(buf[4 + i]);
81         }
82     }
83     return NO_ERROR;
84 }
85 
86 #if defined(__clang__)
87 #pragma clang diagnostic pop
88 #endif
89 
90 } // namespace android
91