init

Telegram/SourceFiles/chat_helpers/stickers_emoji_image_loader.cpp

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+/*
+This file is part of Telegram Desktop,
+the official desktop application for the Telegram messaging service.
+
+For license and copyright information please follow this link:
+https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
+*/
+#include "chat_helpers/stickers_emoji_image_loader.h"
+
+#include "styles/style_chat.h"
+
+#include <QtCore/QtMath>
+
+namespace Stickers {
+
+EmojiImageLoader::EmojiImageLoader(crl::weak_on_queue<EmojiImageLoader> weak)
+: _weak(std::move(weak)) {
+}
+
+void EmojiImageLoader::init(
+		std::shared_ptr<UniversalImages> images,
+		bool largeEnabled) {
+	Expects(images != nullptr);
+
+	_images = std::move(images);
+	if (largeEnabled) {
+		_images->ensureLoaded();
+	}
+}
+
+QImage EmojiImageLoader::prepare(EmojiPtr emoji) const {
+	const auto loaded = _images->ensureLoaded();
+	const auto factor = style::DevicePixelRatio();
+	const auto side = st::largeEmojiSize + 2 * st::largeEmojiOutline;
+	auto tinted = QImage(
+		QSize(st::largeEmojiSize, st::largeEmojiSize) * factor,
+		QImage::Format_ARGB32_Premultiplied);
+	tinted.fill(Qt::white);
+	if (loaded) {
+		QPainter p(&tinted);
+		p.setCompositionMode(QPainter::CompositionMode_DestinationIn);
+		_images->draw(
+			p,
+			emoji,
+			st::largeEmojiSize * factor,
+			0,
+			0);
+	}
+	auto result = QImage(
+		QSize(side, side) * factor,
+		QImage::Format_ARGB32_Premultiplied);
+	result.fill(Qt::transparent);
+	if (loaded) {
+		QPainter p(&result);
+		const auto delta = st::largeEmojiOutline * factor;
+		const auto planar = std::array<QPoint, 4>{ {
+			{ 0, -1 },
+			{ -1, 0 },
+			{ 1, 0 },
+			{ 0, 1 },
+		} };
+		for (const auto &shift : planar) {
+			for (auto i = 0; i != delta; ++i) {
+				p.drawImage(QPoint(delta, delta) + shift * (i + 1), tinted);
+			}
+		}
+		const auto diagonal = std::array<QPoint, 4>{ {
+			{ -1, -1 },
+			{ 1, -1 },
+			{ -1, 1 },
+			{ 1, 1 },
+		} };
+		const auto corrected = int(base::SafeRound(delta / M_SQRT2));
+		for (const auto &shift : diagonal) {
+			for (auto i = 0; i != corrected; ++i) {
+				p.drawImage(QPoint(delta, delta) + shift * (i + 1), tinted);
+			}
+		}
+		_images->draw(
+			p,
+			emoji,
+			st::largeEmojiSize * factor,
+			delta,
+			delta);
+	}
+	return result;
+}
+
+void EmojiImageLoader::switchTo(std::shared_ptr<UniversalImages> images) {
+	_images = std::move(images);
+}
+
+auto EmojiImageLoader::releaseImages() -> std::shared_ptr<UniversalImages> {
+	return std::exchange(
+		_images,
+		std::make_shared<UniversalImages>(_images->id()));
+}
+
+} // namespace Stickers