init

Telegram/lib_ui/ui/effects/frame_generator.cpp

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+// This file is part of Desktop App Toolkit,
+// a set of libraries for developing nice desktop applications.
+//
+// For license and copyright information please follow this link:
+// https://github.com/desktop-app/legal/blob/master/LEGAL
+//
+#include "ui/effects/frame_generator.h"
+
+#include "ui/image/image_prepare.h"
+
+namespace Ui {
+
+ImageFrameGenerator::ImageFrameGenerator(const QByteArray &bytes)
+: _bytes(bytes) {
+}
+
+ImageFrameGenerator::ImageFrameGenerator(const QImage &image)
+: _image(image) {
+}
+
+int ImageFrameGenerator::count() {
+	return 1;
+}
+
+double ImageFrameGenerator::rate() {
+	return 1.;
+}
+
+FrameGenerator::Frame ImageFrameGenerator::renderNext(
+		QImage storage,
+		QSize size,
+		Qt::AspectRatioMode mode) {
+	return renderCurrent(std::move(storage), size, mode);
+}
+
+FrameGenerator::Frame ImageFrameGenerator::renderCurrent(
+		QImage storage,
+		QSize size,
+		Qt::AspectRatioMode mode) {
+	if (_image.isNull() && !_bytes.isEmpty()) {
+		_image = Images::Read({
+			.content = _bytes,
+		}).image;
+		_bytes = QByteArray();
+	}
+	if (_image.isNull()) {
+		return {};
+	}
+	auto scaled = _image.scaled(
+		size,
+		mode,
+		Qt::SmoothTransformation
+	).convertToFormat(QImage::Format_ARGB32_Premultiplied);
+	if (scaled.size() == size) {
+		return { .image = std::move(scaled) };
+	}
+	auto result = QImage(size, QImage::Format_ARGB32_Premultiplied);
+	result.fill(Qt::transparent);
+
+	const auto skipx = (size.width() - scaled.width()) / 2;
+	const auto skipy = (size.height() - scaled.height()) / 2;
+	const auto srcPerLine = scaled.bytesPerLine();
+	const auto dstPerLine = result.bytesPerLine();
+	const auto lineBytes = scaled.width() * 4;
+	auto src = scaled.constBits();
+	auto dst = result.bits() + (skipx * 4) + (skipy * srcPerLine);
+	for (auto y = 0, height = scaled.height(); y != height; ++y) {
+		memcpy(dst, src, lineBytes);
+		src += srcPerLine;
+		dst += dstPerLine;
+	}
+
+	return { .image = std::move(result), .last = true };
+}
+
+void ImageFrameGenerator::jumpToStart() {
+}
+
+} // namespace Ui