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Rotate background with half a speed.

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This commit is contained in:
John Preston 2021-09-07 09:27:02 +03:00
parent b6cd9c2911
commit e880b66574
1 changed files with 26 additions and 6 deletions
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32
Telegram/SourceFiles/ui/chat/chat_theme.cpp
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@ -32,6 +32,25 @@ constexpr auto kMinAcceptableContrast = 1.14;// 4.5;
return QColor(213, 223, 233);
}
[[nodiscard]] int ComputeRealRotation(const CacheBackgroundRequest &request) {
if (request.background.colors.size() < 3) {
return request.background.gradientRotation;
}
const auto doubled = (request.background.gradientRotation
+ request.gradientRotationAdd) % 720;
return (((doubled % 2) ? (doubled - 45) : doubled) / 2) % 360;
}
[[nodiscard]] double ComputeRealProgress(
const CacheBackgroundRequest &request) {
if (request.background.colors.size() < 3) {
return 1.;
}
const auto doubled = (request.background.gradientRotation
+ request.gradientRotationAdd) % 720;
return (doubled % 2) ? 0.5 : 1.;
}
[[nodiscard]] CacheBackgroundResult CacheBackground(
const CacheBackgroundRequest &request) {
Expects(!request.area.isEmpty());
@ -42,8 +61,8 @@ constexpr auto kMinAcceptableContrast = 1.14;// 4.5;
? Images::GenerateGradient(
request.background.gradientForFill.size(),
request.background.colors,
(request.background.gradientRotation
+ request.gradientRotationAdd) % 360)
ComputeRealRotation(request),
ComputeRealProgress(request))
: request.background.gradientForFill;
if (request.background.isPattern
|| request.background.tile
@ -431,10 +450,10 @@ void ChatTheme::generateNextBackgroundRotation() {
if (background().colors.size() < 3) {
return;
}
constexpr auto kAddRotation = 315;
constexpr auto kAddRotationDoubled = (720 - 45);
const auto request = currentCacheRequest(
_backgroundState.now.area,
kAddRotation);
kAddRotationDoubled);
if (!request) {
return;
}
@ -445,10 +464,11 @@ void ChatTheme::generateNextBackgroundRotation() {
}
const auto request = currentCacheRequest(
_backgroundState.now.area,
kAddRotation);
kAddRotationDoubled);
if (forRequest == request) {
_mutableBackground.gradientRotation
= (_mutableBackground.gradientRotation + kAddRotation) % 360;
= (_mutableBackground.gradientRotation
+ kAddRotationDoubled) % 720;
_backgroundNext = std::move(result);
}
});