Added initial ability to rotate and flip image to photo editor.

Telegram/CMakeLists.txt

@@ -510,6 +510,7 @@ PRIVATE
     dialogs/dialogs_widget.h
     editor/photo_editor.cpp
     editor/photo_editor.h
+    editor/photo_editor_common.h
     editor/photo_editor_content.cpp
     editor/photo_editor_content.h
     editor/photo_editor_controls.cpp

Telegram/SourceFiles/editor/photo_editor.cpp

@@ -29,6 +29,21 @@ PhotoEditor::PhotoEditor(
 			- style::margins(0, contentRect.height(), 0, 0);
 		_controls->setGeometry(controlsRect);
 	}, lifetime());
+
+	_controls->rotateRequests(
+	) | rpl::start_with_next([=](int angle) {
+		_modifications.angle += 90;
+		if (_modifications.angle >= 360) {
+			_modifications.angle -= 360;
+		}
+		_content->applyModifications(_modifications);
+	}, lifetime());
+
+	_controls->flipRequests(
+	) | rpl::start_with_next([=] {
+		_modifications.flipped = !_modifications.flipped;
+		_content->applyModifications(_modifications);
+	}, lifetime());
 }
 
 } // namespace Editor

Telegram/SourceFiles/editor/photo_editor.h

@@ -9,6 +9,8 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 
 #include "ui/rp_widget.h"
 
+#include "editor/photo_editor_common.h"
+
 #include "base/unique_qptr.h"
 
 namespace Editor {
@@ -24,6 +26,8 @@ public:
 
 private:
 
+	PhotoModifications _modifications;
+
 	base::unique_qptr<PhotoEditorContent> _content;
 	base::unique_qptr<PhotoEditorControls> _controls;
 

Telegram/SourceFiles/editor/photo_editor_common.h

@@ -0,0 +1,17 @@
+/*
+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
+*/
+#pragma once
+
+namespace Editor {
+
+struct PhotoModifications {
+	int angle = 0;
+	bool flipped = false;
+};
+
+} // namespace Editor

Telegram/SourceFiles/editor/photo_editor_content.cpp

@@ -7,6 +7,8 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 */
 #include "editor/photo_editor_content.h"
 
+#include "media/view/media_view_pip.h"
+
 namespace Editor {
 
 PhotoEditorContent::PhotoEditorContent(
@@ -14,23 +16,33 @@ PhotoEditorContent::PhotoEditorContent(
 	std::shared_ptr<QPixmap> photo)
 : RpWidget(parent) {
 
-	sizeValue(
-	) | rpl::start_with_next([=](const QSize &size) {
+	rpl::combine(
+		_modifications.value(),
+		sizeValue()
+	) | rpl::start_with_next([=](
+			const PhotoModifications &mods, const QSize &size) {
+		const auto rotatedSize =
+			Media::View::FlipSizeByRotation(size, mods.angle);
 		const auto imageSize = [&] {
 			const auto originalSize = photo->size() / cIntRetinaFactor();
-			if ((originalSize.width() > size.width())
-				&& (originalSize.height() > size.height())) {
+			if ((originalSize.width() > rotatedSize.width())
+				|| (originalSize.height() > rotatedSize.height())) {
 				return originalSize.scaled(
-					size,
+					rotatedSize,
 					Qt::KeepAspectRatio);
 			}
 			return originalSize;
 		}();
 		_imageRect = QRect(
-			QPoint(
-				(size.width() - imageSize.width()) / 2,
-				(size.height() - imageSize.height()) / 2),
+			QPoint(-imageSize.width() / 2, -imageSize.height() / 2),
 			imageSize);
+
+		_imageMatrix.reset();
+		_imageMatrix.translate(size.width() / 2, size.height() / 2);
+		if (mods.flipped) {
+			_imageMatrix.scale(-1, 1);
+		}
+		_imageMatrix.rotate(mods.angle);
 	}, lifetime());
 
 	paintRequest(
@@ -38,8 +50,17 @@ PhotoEditorContent::PhotoEditorContent(
 		Painter p(this);
 
 		p.fillRect(clip, Qt::transparent);
-		p.drawPixmap(_imageRect, *photo, photo->rect());
+
+		p.setMatrix(_imageMatrix);
+
+		p.drawPixmap(_imageRect, *photo);
 	}, lifetime());
 }
 
+void PhotoEditorContent::applyModifications(
+		PhotoModifications modifications) {
+	_modifications = std::move(modifications);
+	update();
+}
+
 } // namespace Editor

Telegram/SourceFiles/editor/photo_editor_content.h

@@ -9,6 +9,8 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 
 #include "ui/rp_widget.h"
 
+#include "editor/photo_editor_common.h"
+
 namespace Editor {
 
 class PhotoEditorContent final : public Ui::RpWidget {
@@ -17,9 +19,14 @@ public:
 		not_null<Ui::RpWidget*> parent,
 		std::shared_ptr<QPixmap> photo);
 
+	void applyModifications(PhotoModifications modifications);
+
 private:
 
+	rpl::variable<PhotoModifications> _modifications;
+
 	QRect _imageRect;
+	QMatrix _imageMatrix;
 
 };
 

Telegram/SourceFiles/editor/photo_editor_controls.cpp

@@ -75,4 +75,13 @@ PhotoEditorControls::PhotoEditorControls(
 	}, lifetime());
 
 }
+
+rpl::producer<int> PhotoEditorControls::rotateRequests() const {
+	return _rotateButton->clicks() | rpl::map([] { return 90; });
+}
+
+rpl::producer<> PhotoEditorControls::flipRequests() const {
+	return _flipButton->clicks() | rpl::to_empty;
+}
+
 } // namespace Editor

Telegram/SourceFiles/editor/photo_editor_controls.h

@@ -23,6 +23,9 @@ public:
 		not_null<Ui::RpWidget*> parent,
 		bool doneControls = true);
 
+	[[nodiscard]] rpl::producer<int> rotateRequests() const;
+	[[nodiscard]] rpl::producer<> flipRequests() const;
+
 private:
 
 	const base::unique_qptr<HorizontalContainer> _buttonsContainer;