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synced 2026-09-21 00:23:56 +08:00
78 lines
2.0 KiB
C++
78 lines
2.0 KiB
C++
/*
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This file is part of Telegram Desktop,
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the official desktop application for the Telegram messaging service.
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For license and copyright information please follow this link:
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https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
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*/
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#include "ui/chat/torn_edge.h"
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#include "ui/painter.h"
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#include "styles/style_chat.h"
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namespace Ui {
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namespace {
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[[nodiscard]] QImage GenerateTornEdgeMaskTop(int width) {
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const auto amplitude = st::unsupportedTearAmplitude;
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const auto period = st::unsupportedTearPeriod;
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const auto jitter = period / 3;
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const auto ratio = style::DevicePixelRatio();
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auto result = QImage(
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QSize(width, amplitude) * ratio,
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QImage::Format_ARGB32_Premultiplied);
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result.setDevicePixelRatio(ratio);
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result.fill(Qt::transparent);
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auto seed = uint32(width) * 2654435761U;
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const auto next = [&] {
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seed = seed * 1664525U + 1013904223U;
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return (seed >> 16);
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};
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const auto level = [&] {
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return amplitude * ((next() % 1024) / 1023.);
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};
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auto path = QPainterPath();
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path.moveTo(0, level());
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for (auto x = 0; x < width;) {
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const auto step = std::max(
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period + int(next() % uint32(2 * jitter + 1)) - jitter,
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1);
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x = std::min(x + step, width);
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path.lineTo(x, level());
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}
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path.lineTo(width, amplitude);
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path.lineTo(0, amplitude);
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path.closeSubpath();
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auto p = QPainter(&result);
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PainterHighQualityEnabler hq(p);
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p.setPen(Qt::NoPen);
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p.setBrush(Qt::white);
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p.drawPath(path);
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p.end();
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return result;
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}
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} // namespace
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void ValidateTornEdges(TornEdgeCache &cache, int width) {
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if (cache.width == width) {
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return;
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}
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cache.width = width;
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cache.maskTop = GenerateTornEdgeMaskTop(width);
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cache.maskBottom = cache.maskTop.mirrored(false, true);
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cache.maskBottom.setDevicePixelRatio(cache.maskTop.devicePixelRatio());
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cache.patternCacheTop = QImage();
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cache.patternCacheBottom = QImage();
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cache.solidCacheTop = QImage();
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cache.solidCacheBottom = QImage();
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cache.solidColorTop = QColor();
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cache.solidColorBottom = QColor();
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}
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} // namespace Ui
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