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/* MaskManager.cpp
Copyright (c) 2021 by Amazinite
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 "MaskManager.h"
#include "../Logger.h"
#include "Sprite.h"
using namespace std;
namespace {
const Point DEFAULT = Point(1., 1.);
map<const Sprite *, bool> warned;
string PrintScale(Point s)
{
return to_string(100. * s.X()) + "x" + to_string(100. * s.Y()) + "%";
}
}
// Move the given masks at 1x scale into the manager's storage.
void MaskManager::SetMasks(const Sprite *sprite, vector<Mask> &&masks)
{
lock_guard<mutex> lock(spriteMutex);
auto &scales = spriteMasks[sprite];
auto it = scales.find(DEFAULT);
if(it != scales.end())
it->second.swap(masks);
else
scales.emplace(DEFAULT, std::move(masks));
}
// Add a scale that the given sprite needs to have a mask for.
void MaskManager::RegisterScale(const Sprite *sprite, Point scale)
{
lock_guard<mutex> lock(spriteMutex);
auto &scales = spriteMasks[sprite];
auto lb = scales.lower_bound(scale);
if(lb == scales.end() || lb->first != scale)
scales.emplace_hint(lb, scale, vector<Mask>{});
else if(!lb->second.empty())
Logger::LogError("Collision mask for sprite \"" + sprite->Name() + "\" at scale "
+ PrintScale(scale) + " was already generated.");
}
// Create the scaled versions of all masks from the 1x versions.
void MaskManager::ScaleMasks()
{
for(auto &spriteScales : spriteMasks)
{
auto &scales = spriteScales.second;
auto baseIt = scales.find(DEFAULT);
if(baseIt == scales.end() || baseIt->second.empty())
continue;
const auto &baseMasks = baseIt->second;
for(auto &it : scales)
{
auto &masks = it.second;
// Skip mask generation for scales that have already been generated previously.
if(!masks.empty())
continue;
masks.reserve(baseMasks.size());
for(auto &&mask : baseMasks)
masks.push_back(mask * it.first);
}
}
}
// Get the masks for the given sprite at the given scale. If a
// sprite has no masks, an empty mask is returned.
const std::vector<Mask> &MaskManager::GetMasks(const Sprite *sprite, Point scale) const
{
static const vector<Mask> EMPTY;
const auto scalesIt = spriteMasks.find(sprite);
if(scalesIt == spriteMasks.end())
{
if(warned.insert(make_pair(sprite, true)).second)
Logger::LogError("Warning: sprite \"" + sprite->Name() + "\": no collision masks found.");
return EMPTY;
}
const auto &scales = scalesIt->second;
const auto maskIt = scales.find(scale);
if(maskIt != scales.end() && !maskIt->second.empty())
return maskIt->second;
// Shouldn't happen, but just in case, print some details about the scales for this sprite (once).
if(warned.insert(make_pair(sprite, true)).second)
{
string warning = "Warning: sprite \"" + sprite->Name() + "\": collision mask not found.";
if(scales.empty()) warning += " (No scaled masks.)";
else if(maskIt != scales.end()) warning += " (No masks for scale " + PrintScale(scale) + ".)";
else
{
warning += "\n\t" + PrintScale(scale) + " not found in known scales:";
for(auto &&s : scales)
warning += "\n\t\t" + PrintScale(s.first);
}
Logger::LogError(warning);
}
return EMPTY;
}
bool MaskManager::Cmp::operator()(const Point &a, const Point &b) const noexcept
{
return a.LengthSquared() < b.LengthSquared();
}
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