OXYGENHUB
◆ main openmsx / src / settings / VideoSourceSetting.cc
4.0 KiB · C++ · last changed chore(): initial commit 1 month ago source blame history raw
1 
#include "VideoSourceSetting.hh"
2
3 
#include "CommandException.hh"
4 
#include "Completer.hh"
5
6 
#include "StringOp.hh"
7 
#include "stl.hh"
8
9 
#include <algorithm>
10
11 
namespace openmsx {
12
13 
VideoSourceSetting::VideoSourceSetting(CommandController& commandController_)
14 
	: Setting(commandController_, "videosource",
15 
	          "selects the video source to display on the screen",
16 
	          TclObject("none"), Save::NO)
17 
{
18 
	sources = { {.name = "none", .id = 0} };
19
20 
	setChecker([this](const TclObject& newValue) {
21 
		checkSetValue(newValue.getString()); // may throw
22 
	});
23 
	init();
24 
}
25
26 
void VideoSourceSetting::checkSetValue(std::string_view newValue) const
27 
{
28 
	// Special case: in case there are no video sources registered (yet),
29 
	// the only allowed value is "none". In case there is at least one
30 
	// registered source, this special value "none" should be hidden.
31 
	if (((newValue == "none") && (sources.size() >  1)) ||
32 
	    ((newValue != "none") && !has(newValue))) {
33 
		throw CommandException("video source not available");
34 
	}
35 
}
36
37 
int VideoSourceSetting::getSource() noexcept
38 
{
39 
	// Always try to find a better value than "none".
40 
	if (std::string_view str = getValue().getString();
41 
	    str != "none") {
42 
		// If current value is allowed, then keep it.
43 
		if (int id = has(str)) {
44 
			return id;
45 
		}
46 
	}
47 
	// Search the best value from the current set of allowed values.
48 
	int id = 0;
49 
	if (!id) { id = has("Video9000"); } // in
50 
	if (!id) { id = has("MSX");       } //  order
51 
	if (!id) { id = has("GFX9000");   } //   of
52 
	if (!id) { id = has("Laserdisc"); } //    preference
53 
	if (!id) {
54 
		// This handles the "none" case, but also stuff like
55 
		// multiple V99x8/V9990 chips. Prefer the source with
56 
		// highest id (=newest).
57 
		id = max_value(sources, &Source::id);
58 
	}
59 
	setSource(id); // store new value
60 
	return id;
61 
}
62
63 
void VideoSourceSetting::setSource(int id)
64 
{
65 
	auto it = find_unguarded(sources, id, &Source::id);
66 
	setValue(TclObject(it->name));
67 
}
68
69 
std::string_view VideoSourceSetting::getTypeString() const
70 
{
71 
	return "enumeration";
72 
}
73
74 
std::vector<std::string_view> VideoSourceSetting::getPossibleValues() const
75 
{
76 
	std::vector<std::string_view> result;
77 
	if (sources.size() == 1) {
78 
		assert(sources.front().name == "none");
79 
		result.emplace_back("none");
80 
	} else {
81 
		for (const auto& [name, val] : sources) {
82 
			if (val != 0) {
83 
				result.emplace_back(name);
84 
			}
85 
		}
86 
	}
87 
	return result;
88 
}
89
90 
void VideoSourceSetting::additionalInfo(TclObject& result) const
91 
{
92 
	TclObject valueList;
93 
	valueList.addListElements(getPossibleValues());
94 
	result.addListElement(valueList);
95 
}
96
97 
void VideoSourceSetting::tabCompletion(std::vector<std::string>& tokens) const
98 
{
99 
	Completer::completeString(tokens, getPossibleValues(),
100 
	                          false); // case insensitive
101 
}
102
103 
int VideoSourceSetting::registerVideoSource(const std::string& source)
104 
{
105 
	static int counter = 0; // id's are globally unique
106
107 
	assert(!has(source));
108 
	sources.emplace_back(source, ++counter);
109
110 
	// First announce extended set of allowed values before announcing a
111 
	// (possibly) different value.
112 
	notifyPropertyChange();
113 
	setSource(getSource()); // via source to (possibly) adjust value
114
115 
	return counter;
116 
}
117
118 
void VideoSourceSetting::unregisterVideoSource(int source)
119 
{
120 
	move_pop_back(sources, rfind_unguarded(sources, source, &Source::id));
121
122 
	// First notify the (possibly) changed value before announcing the
123 
	// shrunken set of values.
124 
	setSource(getSource()); // via source to (possibly) adjust value
125 
	notifyPropertyChange();
126 
}
127
128 
bool VideoSourceSetting::has(int val) const
129 
{
130 
	return contains(sources, val, &Source::id);
131 
}
132
133 
int VideoSourceSetting::has(std::string_view val) const
134 
{
135 
	auto it = std::ranges::find_if(sources, [&](auto& p) {
136 
		StringOp::casecmp cmp;
137 
		return cmp(p.name, val);
138 
	});
139 
	return (it != end(sources)) ? it->id : 0;
140 
}
141
142
143 
VideoSourceActivator::VideoSourceActivator(
144 
	VideoSourceSetting& setting_, const std::string& name)
145 
	: setting(setting_)
146 
	, id(setting.registerVideoSource(name))
147 
{
148 
}
149
150 
VideoSourceActivator::~VideoSourceActivator()
151 
{
152 
	setting.unregisterVideoSource(id);
153 
}
154
155 
} // namespace openmsx