blob: cf7ec4786d2bead1e5d8b31a348a8bff654ec7a6 (
plain)
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
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
|
// Copyright 2019 The Amber Authors.
//
// 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.
#include "samples/ppm.h"
#include <cassert>
#include "amber/result.h"
#include "amber/value.h"
namespace ppm {
namespace {
char byte0(uint32_t word) {
return static_cast<char>(word);
}
char byte1(uint32_t word) {
return static_cast<char>(word >> 8);
}
char byte2(uint32_t word) {
return static_cast<char>(word >> 16);
}
} // namespace
std::pair<amber::Result, std::string> ConvertToPPM(
uint32_t width,
uint32_t height,
const std::vector<amber::Value>& values) {
assert(values.size() == width * height);
// Write PPM header
const uint32_t maximum_color_value = 255;
std::string image = "P6\n";
image += std::to_string(width) + " " + std::to_string(height) + "\n";
image += std::to_string(maximum_color_value) + "\n";
// Write PPM data
for (amber::Value value : values) {
const uint32_t pixel = value.AsUint32();
// We assume B8G8R8A8_UNORM here:
image.push_back(byte2(pixel)); // R
image.push_back(byte1(pixel)); // G
image.push_back(byte0(pixel)); // B
// PPM does not support alpha channel
}
return std::make_pair(amber::Result(), image);
}
} // namespace ppm
|
