/
ApngDecoder.h
45 lines (39 loc) · 1.3 KB
/
ApngDecoder.h
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
//
// Copyright 2018 LINE Corporation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#pragma once
#include "ApngImage.h"
#include "StreamSource.h"
namespace apng_drawable {
/**
* Creates the integer value containing color information with ABGR format.
* Android is using RGBA format internally, and uses ABGR because of endianness.
*/
inline uint32_t abgr(uint32_t a, uint32_t b, uint32_t g, uint32_t r) {
return r | g << 8u | b << 16u | a << 24u;
}
/**
* Returns `a * b / 255` and rounding any fractional bits.
*/
inline uint32_t div255Round(uint32_t a, uint32_t b) {
return a * b * 0x8081u >> 23u & 0xFFu;
}
class ApngDecoder {
public:
static std::unique_ptr<ApngImage> decode(std::unique_ptr<StreamSource> source, int &status);
static bool isApng(std::unique_ptr<StreamSource> source);
private:
};
}