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Fan the community userpic cards from a bottom-left pivot.

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This commit is contained in:
John Preston
2026-06-16 18:17:48 +04:00
parent 9e9c9cb379
commit f6c0d1fef2
1 changed files with 29 additions and 29 deletions
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Telegram/SourceFiles/ui/userpic_view.cpp
+29 -29
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@@ -16,16 +16,15 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
namespace Ui {
namespace {
constexpr auto kPeek = 0.26; // Tunable. Strip width to the left of the userpic.
constexpr auto kCard1Scale = 0.94; // Tunable.
constexpr auto kCard1Dx = 0.12; // Tunable.
constexpr auto kCard1Angle = -7.; // Tunable.
constexpr auto kCard1Radius = 0.25; // Tunable. Less rounded than the userpic.
constexpr auto kPeek = 0.3; // Tunable. Strip width to the left of the userpic.
constexpr auto kCover = 0.5; // Tunable. How far the image reaches into the userpic.
constexpr auto kCard1Scale = 0.82; // Tunable.
constexpr auto kCard1Angle = -9.; // Tunable.
constexpr auto kCard1Radius = 0.22; // Tunable. Less rounded than the userpic.
constexpr auto kCard1Opacity = 0.5; // Tunable.
constexpr auto kCard2Scale = 0.86; // Tunable.
constexpr auto kCard2Dx = 0.22; // Tunable.
constexpr auto kCard2Angle = -14.; // Tunable.
constexpr auto kCard2Radius = 0.18; // Tunable. Even less rounded.
constexpr auto kCard2Scale = 0.7; // Tunable.
constexpr auto kCard2Angle = -16.; // Tunable.
constexpr auto kCard2Radius = 0.16; // Tunable. Even less rounded.
constexpr auto kCard2Opacity = 0.3; // Tunable.
constexpr auto kGap = 0.02; // Tunable.
@@ -60,7 +59,7 @@ void PaintCommunityUserpicEffect(
cache.paletteVersion = version;
cache.dpr = dpr;
const auto imageW = int(std::ceil(peek * dpr));
const auto imageW = int(std::ceil((peek + size * kCover) * dpr));
const auto imageH = int(std::ceil(size * dpr));
if (cache.image.size() != QSize(imageW, imageH)) {
cache.image = QImage(
@@ -72,52 +71,53 @@ void PaintCommunityUserpicEffect(
auto q = QPainter(&cache.image);
auto hq = PainterHighQualityEnabler(q);
const auto Cu = QPointF(peek + size / 2., size / 2.);
const auto gap = size * kGap;
const auto rounding = Ui::ForumUserpicRadiusMultiplier();
// The userpic and every card share a pivot on the userpic's left edge
// where its bottom-left rounding starts; each card is pinned there and
// rotated, so only its top-left corner peeks out to the left.
const auto pivot = QPointF(peek, size * (1. - rounding));
const auto card = [&](
QPointF center,
float64 side,
float64 scale,
float64 round,
float64 angle,
float64 rounding) {
const auto half = side / 2.;
const auto radius = side * rounding;
float64 grow) {
const auto side = size * scale;
const auto radius = side * round;
const auto top = pivot.y() - (side - radius);
q.save();
q.translate(center);
q.translate(pivot);
q.rotate(angle);
q.translate(-pivot);
q.drawRoundedRect(
QRectF(-half, -half, side, side),
radius,
radius);
QRectF(peek - grow, top - grow, side + 2 * grow, side + 2 * grow),
radius + grow,
radius + grow);
q.restore();
};
const auto s1 = size * kCard1Scale;
const auto C1 = Cu - QPointF(size * kCard1Dx, 0.);
const auto s2 = size * kCard2Scale;
const auto C2 = Cu - QPointF(size * kCard2Dx, 0.);
q.setPen(Qt::NoPen);
auto color2 = color;
color2.setAlphaF(color.alphaF() * kCard2Opacity);
q.setBrush(color2);
card(C2, s2, kCard2Angle, kCard2Radius);
card(kCard2Scale, kCard2Radius, kCard2Angle, 0.);
// Carve a transparent gap, then draw card1 on top.
q.setCompositionMode(QPainter::CompositionMode_Source);
q.setBrush(Qt::transparent);
card(C1, s1 + 2 * gap, kCard1Angle, kCard1Radius);
card(kCard1Scale, kCard1Radius, kCard1Angle, gap);
q.setCompositionMode(QPainter::CompositionMode_SourceOver);
auto color1 = color;
color1.setAlphaF(color.alphaF() * kCard1Opacity);
q.setBrush(color1);
card(C1, s1, kCard1Angle, kCard1Radius);
card(kCard1Scale, kCard1Radius, kCard1Angle, 0.);
// Carve the userpic gap; the userpic is drawn by the caller.
q.setCompositionMode(QPainter::CompositionMode_Source);
q.setBrush(Qt::transparent);
card(Cu, size + 2 * gap, 0., Ui::ForumUserpicRadiusMultiplier());
card(1., rounding, 0., gap);
}
p.drawImage(QPointF(x - peek, y), cache.image);
}