blob: 25063892b7b37c8055297031ca55a15472bc9f25 (
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
|
#include <mbgl/util/image.hpp>
#include <mbgl/util/string.hpp>
#include <mbgl/util/premultiply.hpp>
namespace mbgl {
PremultipliedImage decodePNG(const uint8_t*, size_t);
PremultipliedImage decodeJPEG(const uint8_t*, size_t);
PremultipliedImage decodeImage(const std::string& string) {
const auto* data = reinterpret_cast<const uint8_t*>(string.data());
const size_t size = string.size();
if (size >= 4) {
uint32_t magic = (data[0] << 24) | (data[1] << 16) | (data[2] << 8) | data[3];
if (magic == 0x89504E47U) {
return decodePNG(data, size);
}
}
if (size >= 2) {
uint16_t magic = ((data[0] << 8) | data[1]) & 0xffff;
if (magic == 0xFFD8) {
return decodeJPEG(data, size);
}
}
throw std::runtime_error("unsupported image type");
}
} // namespace mbgl
|