tdesktop/Telegram/SourceFiles/ui/grouped_layout.cpp

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/*
This file is part of Telegram Desktop,
the official desktop application for the Telegram messaging service.
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For license and copyright information please follow this link:
https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
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*/
#include "ui/grouped_layout.h"
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namespace Ui {
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namespace {
int Round(float64 value) {
return int(base::SafeRound(value));
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}
class Layouter {
public:
Layouter(
const std::vector<QSize> &sizes,
int maxWidth,
int minWidth,
int spacing);
std::vector<GroupMediaLayout> layout() const;
private:
static std::vector<float64> CountRatios(const std::vector<QSize> &sizes);
static std::string CountProportions(const std::vector<float64> &ratios);
std::vector<GroupMediaLayout> layoutTwo() const;
std::vector<GroupMediaLayout> layoutThree() const;
std::vector<GroupMediaLayout> layoutFour() const;
std::vector<GroupMediaLayout> layoutOne() const;
std::vector<GroupMediaLayout> layoutTwoTopBottom() const;
std::vector<GroupMediaLayout> layoutTwoLeftRightEqual() const;
std::vector<GroupMediaLayout> layoutTwoLeftRight() const;
std::vector<GroupMediaLayout> layoutThreeLeftAndOther() const;
std::vector<GroupMediaLayout> layoutThreeTopAndOther() const;
std::vector<GroupMediaLayout> layoutFourLeftAndOther() const;
std::vector<GroupMediaLayout> layoutFourTopAndOther() const;
const std::vector<QSize> &_sizes;
const std::vector<float64> _ratios;
const std::string _proportions;
const int _count = 0;
const int _maxWidth = 0;
const int _maxHeight = 0;
const int _minWidth = 0;
const int _spacing = 0;
const float64 _averageRatio = 1.;
const float64 _maxSizeRatio = 1.;
};
class ComplexLayouter {
public:
ComplexLayouter(
const std::vector<float64> &ratios,
float64 averageRatio,
int maxWidth,
int minWidth,
int spacing);
std::vector<GroupMediaLayout> layout() const;
private:
struct Attempt {
std::vector<int> lineCounts;
std::vector<float64> heights;
};
static std::vector<float64> CropRatios(
const std::vector<float64> &ratios,
float64 averageRatio);
const std::vector<float64> _ratios;
const int _count = 0;
const int _maxWidth = 0;
const int _maxHeight = 0;
const int _minWidth = 0;
const int _spacing = 0;
const float64 _averageRatio = 1.;
};
Layouter::Layouter(
const std::vector<QSize> &sizes,
int maxWidth,
int minWidth,
int spacing)
: _sizes(sizes)
, _ratios(CountRatios(_sizes))
, _proportions(CountProportions(_ratios))
, _count(int(_ratios.size()))
// All apps currently use square max size first.
// In complex case they use maxWidth * 4 / 3 as maxHeight.
, _maxWidth(maxWidth)
, _maxHeight(maxWidth)
, _minWidth(minWidth)
, _spacing(spacing)
, _averageRatio(ranges::accumulate(_ratios, 1.) / _count)
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, _maxSizeRatio(_maxWidth / float64(_maxHeight)) {
}
std::vector<float64> Layouter::CountRatios(const std::vector<QSize> &sizes) {
return ranges::views::all(
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sizes
) | ranges::views::transform([](const QSize &size) {
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return size.width() / float64(size.height());
}) | ranges::to_vector;
}
std::string Layouter::CountProportions(const std::vector<float64> &ratios) {
return ranges::views::all(
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ratios
) | ranges::views::transform([](float64 ratio) {
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return (ratio > 1.2) ? 'w' : (ratio < 0.8) ? 'n' : 'q';
}) | ranges::to<std::string>();
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}
std::vector<GroupMediaLayout> Layouter::layout() const {
if (!_count) {
return {};
} else if (_count == 1) {
return layoutOne();
}
using namespace rpl::mappers;
if (_count >= 5 || ranges::find_if(_ratios, _1 > 2) != _ratios.end()) {
return ComplexLayouter(
_ratios,
_averageRatio,
_maxWidth,
_minWidth,
_spacing).layout();
}
if (_count == 2) {
return layoutTwo();
} else if (_count == 3) {
return layoutThree();
}
return layoutFour();
}
std::vector<GroupMediaLayout> Layouter::layoutTwo() const {
Expects(_count == 2);
if ((_proportions == "ww")
&& (_averageRatio > 1.4 * _maxSizeRatio)
&& (_ratios[1] - _ratios[0] < 0.2)) {
return layoutTwoTopBottom();
} else if (_proportions == "ww" || _proportions == "qq") {
return layoutTwoLeftRightEqual();
}
return layoutTwoLeftRight();
}
std::vector<GroupMediaLayout> Layouter::layoutThree() const {
Expects(_count == 3);
auto result = std::vector<GroupMediaLayout>(_count);
if (_proportions[0] == 'n') {
return layoutThreeLeftAndOther();
}
return layoutThreeTopAndOther();
}
std::vector<GroupMediaLayout> Layouter::layoutFour() const {
Expects(_count == 4);
auto result = std::vector<GroupMediaLayout>(_count);
if (_proportions[0] == 'w') {
return layoutFourTopAndOther();
}
return layoutFourLeftAndOther();
}
std::vector<GroupMediaLayout> Layouter::layoutOne() const {
Expects(_count == 1);
const auto width = _maxWidth;
const auto height = (_sizes[0].height() * width) / _sizes[0].width();
return {
{
QRect(0, 0, width, height),
RectPart::Left | RectPart::Top | RectPart::Right | RectPart::Bottom
},
};
}
std::vector<GroupMediaLayout> Layouter::layoutTwoTopBottom() const {
Expects(_count == 2);
const auto width = _maxWidth;
const auto height = Round(std::min(
width / _ratios[0],
std::min(
width / _ratios[1],
(_maxHeight - _spacing) / 2.)));
return {
{
QRect(0, 0, width, height),
RectPart::Left | RectPart::Top | RectPart::Right
},
{
QRect(0, height + _spacing, width, height),
RectPart::Left | RectPart::Bottom | RectPart::Right
},
};
}
std::vector<GroupMediaLayout> Layouter::layoutTwoLeftRightEqual() const {
Expects(_count == 2);
const auto width = (_maxWidth - _spacing) / 2;
const auto height = Round(std::min(
width / _ratios[0],
std::min(width / _ratios[1], _maxHeight * 1.)));
return {
{
QRect(0, 0, width, height),
RectPart::Top | RectPart::Left | RectPart::Bottom
},
{
QRect(width + _spacing, 0, width, height),
RectPart::Top | RectPart::Right | RectPart::Bottom
},
};
}
std::vector<GroupMediaLayout> Layouter::layoutTwoLeftRight() const {
Expects(_count == 2);
const auto minimalWidth = Round(_minWidth * 1.5);
const auto secondWidth = std::min(
Round(std::max(
0.4 * (_maxWidth - _spacing),
(_maxWidth - _spacing) / _ratios[0]
/ (1. / _ratios[0] + 1. / _ratios[1]))),
_maxWidth - _spacing - minimalWidth);
const auto firstWidth = _maxWidth
- secondWidth
- _spacing;
const auto height = std::min(
_maxHeight,
Round(std::min(
firstWidth / _ratios[0],
secondWidth / _ratios[1])));
return {
{
QRect(0, 0, firstWidth, height),
RectPart::Top | RectPart::Left | RectPart::Bottom
},
{
QRect(firstWidth + _spacing, 0, secondWidth, height),
RectPart::Top | RectPart::Right | RectPart::Bottom
},
};
}
std::vector<GroupMediaLayout> Layouter::layoutThreeLeftAndOther() const {
Expects(_count == 3);
const auto firstHeight = _maxHeight;
const auto thirdHeight = Round(std::min(
(_maxHeight - _spacing) / 2.,
(_ratios[1] * (_maxWidth - _spacing)
/ (_ratios[2] + _ratios[1]))));
const auto secondHeight = firstHeight
- thirdHeight
- _spacing;
const auto rightWidth = std::max(
_minWidth,
Round(std::min(
(_maxWidth - _spacing) / 2.,
std::min(
thirdHeight * _ratios[2],
secondHeight * _ratios[1]))));
const auto leftWidth = std::min(
Round(firstHeight * _ratios[0]),
_maxWidth - _spacing - rightWidth);
return {
{
QRect(0, 0, leftWidth, firstHeight),
RectPart::Top | RectPart::Left | RectPart::Bottom
},
{
QRect(leftWidth + _spacing, 0, rightWidth, secondHeight),
RectPart::Top | RectPart::Right
},
{
QRect(leftWidth + _spacing, secondHeight + _spacing, rightWidth, thirdHeight),
RectPart::Bottom | RectPart::Right
},
};
}
std::vector<GroupMediaLayout> Layouter::layoutThreeTopAndOther() const {
Expects(_count == 3);
const auto firstWidth = _maxWidth;
const auto firstHeight = Round(std::min(
firstWidth / _ratios[0],
(_maxHeight - _spacing) * 0.66));
const auto secondWidth = (_maxWidth - _spacing) / 2;
const auto secondHeight = std::min(
_maxHeight - firstHeight - _spacing,
Round(std::min(
secondWidth / _ratios[1],
secondWidth / _ratios[2])));
const auto thirdWidth = firstWidth - secondWidth - _spacing;
return {
{
QRect(0, 0, firstWidth, firstHeight),
RectPart::Left | RectPart::Top | RectPart::Right
},
{
QRect(0, firstHeight + _spacing, secondWidth, secondHeight),
RectPart::Bottom | RectPart::Left
},
{
QRect(secondWidth + _spacing, firstHeight + _spacing, thirdWidth, secondHeight),
RectPart::Bottom | RectPart::Right
},
};
}
std::vector<GroupMediaLayout> Layouter::layoutFourTopAndOther() const {
Expects(_count == 4);
const auto w = _maxWidth;
const auto h0 = Round(std::min(
w / _ratios[0],
(_maxHeight - _spacing) * 0.66));
const auto h = Round(
(_maxWidth - 2 * _spacing)
/ (_ratios[1] + _ratios[2] + _ratios[3]));
const auto w0 = std::max(
_minWidth,
Round(std::min(
(_maxWidth - 2 * _spacing) * 0.4,
h * _ratios[1])));
const auto w2 = Round(std::max(
std::max(
_minWidth * 1.,
(_maxWidth - 2 * _spacing) * 0.33),
h * _ratios[3]));
const auto w1 = w - w0 - w2 - 2 * _spacing;
const auto h1 = std::min(
_maxHeight - h0 - _spacing,
h);
return {
{
QRect(0, 0, w, h0),
RectPart::Left | RectPart::Top | RectPart::Right
},
{
QRect(0, h0 + _spacing, w0, h1),
RectPart::Bottom | RectPart::Left
},
{
QRect(w0 + _spacing, h0 + _spacing, w1, h1),
RectPart::Bottom,
},
{
QRect(w0 + _spacing + w1 + _spacing, h0 + _spacing, w2, h1),
RectPart::Right | RectPart::Bottom
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},
};
}
std::vector<GroupMediaLayout> Layouter::layoutFourLeftAndOther() const {
Expects(_count == 4);
const auto h = _maxHeight;
const auto w0 = Round(std::min(
h * _ratios[0],
(_maxWidth - _spacing) * 0.6));
const auto w = Round(
(_maxHeight - 2 * _spacing)
/ (1. / _ratios[1] + 1. / _ratios[2] + 1. / _ratios[3])
);
const auto h0 = Round(w / _ratios[1]);
const auto h1 = Round(w / _ratios[2]);
const auto h2 = h - h0 - h1 - 2 * _spacing;
const auto w1 = std::max(
_minWidth,
std::min(_maxWidth - w0 - _spacing, w));
return {
{
QRect(0, 0, w0, h),
RectPart::Top | RectPart::Left | RectPart::Bottom
},
{
QRect(w0 + _spacing, 0, w1, h0),
RectPart::Top | RectPart::Right
},
{
QRect(w0 + _spacing, h0 + _spacing, w1, h1),
RectPart::Right
},
{
QRect(w0 + _spacing, h0 + h1 + 2 * _spacing, w1, h2),
RectPart::Bottom | RectPart::Right
},
};
}
ComplexLayouter::ComplexLayouter(
const std::vector<float64> &ratios,
float64 averageRatio,
int maxWidth,
int minWidth,
int spacing)
: _ratios(CropRatios(ratios, averageRatio))
, _count(int(_ratios.size()))
// All apps currently use square max size first.
// In complex case they use maxWidth * 4 / 3 as maxHeight.
, _maxWidth(maxWidth)
, _maxHeight(maxWidth * 4 / 3)
, _minWidth(minWidth)
, _spacing(spacing)
, _averageRatio(averageRatio) {
}
std::vector<float64> ComplexLayouter::CropRatios(
const std::vector<float64> &ratios,
float64 averageRatio) {
return ranges::views::all(
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ratios
) | ranges::views::transform([&](float64 ratio) {
constexpr auto kMaxRatio = 2.75;
constexpr auto kMinRatio = 0.6667;
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return (averageRatio > 1.1)
? std::clamp(ratio, 1., kMaxRatio)
: std::clamp(ratio, kMinRatio, 1.);
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}) | ranges::to_vector;
}
std::vector<GroupMediaLayout> ComplexLayouter::layout() const {
Expects(_count > 1);
auto result = std::vector<GroupMediaLayout>(_count);
auto attempts = std::vector<Attempt>();
const auto multiHeight = [&](int offset, int count) {
const auto ratios = gsl::make_span(_ratios).subspan(offset, count);
const auto sum = ranges::accumulate(ratios, 0.);
return (_maxWidth - (count - 1) * _spacing) / sum;
};
const auto pushAttempt = [&](std::vector<int> lineCounts) {
auto heights = std::vector<float64>();
heights.reserve(lineCounts.size());
auto offset = 0;
for (auto count : lineCounts) {
heights.push_back(multiHeight(offset, count));
offset += count;
}
attempts.push_back({ std::move(lineCounts), std::move(heights) });
};
for (auto first = 1; first != _count; ++first) {
const auto second = _count - first;
if (first > 3 || second > 3) {
continue;
}
pushAttempt({ first, second });
}
for (auto first = 1; first != _count - 1; ++first) {
for (auto second = 1; second != _count - first; ++second) {
const auto third = _count - first - second;
if ((first > 3)
|| (second > ((_averageRatio < 0.85) ? 4 : 3))
|| (third > 3)) {
continue;
}
pushAttempt({ first, second, third });
}
}
for (auto first = 1; first != _count - 1; ++first) {
for (auto second = 1; second != _count - first; ++second) {
for (auto third = 1; third != _count - first - second; ++third) {
const auto fourth = _count - first - second - third;
if (first > 3 || second > 3 || third > 3 || fourth > 3) {
continue;
}
pushAttempt({ first, second, third, fourth });
}
}
}
auto optimalAttempt = (const Attempt*)nullptr;
auto optimalDiff = 0.;
for (const auto &attempt : attempts) {
const auto &heights = attempt.heights;
const auto &counts = attempt.lineCounts;
const auto lineCount = int(counts.size());
const auto totalHeight = ranges::accumulate(heights, 0.)
+ _spacing * (lineCount - 1);
const auto minLineHeight = ranges::min(heights);
const auto bad1 = (minLineHeight < _minWidth) ? 1.5 : 1.;
const auto bad2 = [&] {
for (auto line = 1; line != lineCount; ++line) {
if (counts[line - 1] > counts[line]) {
return 1.5;
}
}
return 1.;
}();
const auto diff = std::abs(totalHeight - _maxHeight) * bad1 * bad2;
if (!optimalAttempt || diff < optimalDiff) {
optimalAttempt = &attempt;
optimalDiff = diff;
}
}
Assert(optimalAttempt != nullptr);
const auto &optimalCounts = optimalAttempt->lineCounts;
const auto &optimalHeights = optimalAttempt->heights;
const auto rowCount = int(optimalCounts.size());
auto index = 0;
auto y = 0.;
for (auto row = 0; row != rowCount; ++row) {
const auto colCount = optimalCounts[row];
const auto lineHeight = optimalHeights[row];
const auto height = Round(lineHeight);
auto x = 0;
for (auto col = 0; col != colCount; ++col) {
const auto sides = RectPart::None
| (row == 0 ? RectPart::Top : RectPart::None)
| (row == rowCount - 1 ? RectPart::Bottom : RectPart::None)
| (col == 0 ? RectPart::Left : RectPart::None)
| (col == colCount - 1 ? RectPart::Right : RectPart::None);
const auto ratio = _ratios[index];
const auto width = (col == colCount - 1)
? (_maxWidth - x)
: Round(ratio * lineHeight);
result[index] = {
QRect(x, y, width, height),
sides
};
x += width + _spacing;
++index;
}
y += height + _spacing;
}
return result;
}
} // namespace
std::vector<GroupMediaLayout> LayoutMediaGroup(
const std::vector<QSize> &sizes,
int maxWidth,
int minWidth,
int spacing) {
return Layouter(sizes, maxWidth, minWidth, spacing).layout();
}
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RectParts GetCornersFromSides(RectParts sides) {
const auto convert = [&](
RectPart side1,
RectPart side2,
RectPart corner) {
return ((sides & side1) && (sides & side2))
? corner
: RectPart::None;
};
return RectPart::None
| convert(RectPart::Top, RectPart::Left, RectPart::TopLeft)
| convert(RectPart::Top, RectPart::Right, RectPart::TopRight)
| convert(RectPart::Bottom, RectPart::Left, RectPart::BottomLeft)
| convert(RectPart::Bottom, RectPart::Right, RectPart::BottomRight);
}
QSize GetImageScaleSizeForGeometry(QSize original, QSize geometry) {
const auto width = geometry.width();
const auto height = geometry.height();
auto tw = original.width();
auto th = original.height();
if (tw * height > th * width) {
if (th > height || tw * height < 2 * th * width) {
tw = (height * tw) / th;
th = height;
} else if (tw < width) {
th = (width * th) / tw;
tw = width;
}
} else {
if (tw > width || th * width < 2 * tw * height) {
th = (width * th) / tw;
tw = width;
} else if (tw > 0 && th < height) {
tw = (height * tw) / th;
th = height;
}
}
if (tw < 1) tw = 1;
if (th < 1) th = 1;
return { tw, th };
}
} // namespace Ui