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/* ImageFileData.cpp
Copyright (c) 2024 by tibetiroka
Endless Sky is free software: you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation, either version 3 of the License, or (at your option) any later version.
Endless Sky is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "ImageFileData.h"
#include "../text/Format.h"
#include "../Logger.h"
#include <cmath>
using namespace std;
namespace {
// Check if the given character is a valid blending mode.
bool IsBlend(char c)
{
return (c == static_cast<char>(BlendingMode::ALPHA) || c == static_cast<char>(BlendingMode::HALF_ADDITIVE)
|| c == static_cast<char>(BlendingMode::ADDITIVE) || c == static_cast<char>(BlendingMode::PREMULTIPLIED_ALPHA)
|| c == static_cast<char>(BlendingMode::COMPAT_HALF_ADDITIVE));
}
}
ImageFileData::ImageFileData(const filesystem::path &path, const filesystem::path &source)
: path(path), extension(Format::LowerCase(path.extension().string()))
{
string name = (path.lexically_relative(source).parent_path() / path.stem()).generic_string();
if(name.ends_with("@2x"))
{
is2x = true;
name.resize(name.size() - 3);
}
if(name.ends_with("@sw"))
{
isSwizzleMask = true;
name.resize(name.size() - 3);
}
size_t frameNumberStart = name.size();
while(frameNumberStart > 0 && name[--frameNumberStart] >= '0' && name[frameNumberStart] <= '9')
continue;
if(frameNumberStart > 0 && IsBlend(name[frameNumberStart]))
{
frameNumber = Format::Parse(name.substr(frameNumberStart + 1));
blendingMode = static_cast<BlendingMode>(name[frameNumberStart]);
name.resize(frameNumberStart);
if(blendingMode == BlendingMode::COMPAT_HALF_ADDITIVE)
{
blendingMode = BlendingMode::HALF_ADDITIVE;
Logger::LogError("Warning: file '" + path.string()
+ "'uses legacy marker for half-additive blending mode; please use '^' instead of '~'.");
}
}
this->name = std::move(name);
}
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