refactor: Remove jpegtran dependency and update ImageRotator for metadata-first rotation approach

README.md

@@ -25,14 +25,6 @@ PhotoSort is a powerful desktop application focused on speed designed to streaml
 
 ## Getting Started
 
-### Prerequisites
-
-* **Python 3.x**: Download from [python.org](https://www.python.org/).
-* **jpegtran (Optional, for Lossless JPEG Rotation)**:
-  * **Windows**: Download from [jpegclub.org](http://jpegclub.org/jpegtran/) or install via Chocolatey: `choco install libjpeg-turbo`
-  * **macOS**: `brew install jpeg-turbo`
-  * **Linux**: `sudo apt-get install libjpeg-turbo-progs` (Ubuntu/Debian) or `sudo yum install libjpeg-turbo-utils` (RedHat/CentOS)
-
 ### Hardware Acceleration (Optional, Recommended)
 
 For significantly faster AI-powered features like **Rotation Detection** and **Similarity Analysis**, use the appropriate requirements file for your hardware.

src/core/app_settings.py

@@ -94,8 +94,6 @@
 DEFAULT_RATING_CACHE_SIZE_LIMIT_MB = 256  # Default 256MB limit for rating cache
 
 # --- File Operation Constants ---
-# Rotation timeout
-JPEGTRAN_TIMEOUT_SECONDS = 5  # Timeout for jpegtran version check
 
 # --- Image Processing Constants ---
 # Image size settings

src/core/image_processing/image_rotator.py

@@ -1,16 +1,12 @@
 import os
 import logging
-import subprocess
-import tempfile
 from typing import Literal, Tuple
 from PIL import Image, ImageOps
 
 # Use the new pyexiv2 abstraction layer
 from core.pyexiv2_wrapper import PyExiv2Operations, safe_pyexiv2_image
 
 from pathlib import Path
-from core.image_file_ops import ImageFileOperations
-from core.app_settings import JPEGTRAN_TIMEOUT_SECONDS
 import piexif  # For EXIF manipulation with Pillow
 from pillow_heif import HeifImageFile  # For HEIF/HEIC support
 
@@ -19,6 +15,14 @@
 # Rotation directions
 RotationDirection = Literal["clockwise", "counterclockwise", "180"]
 
+"""
+Handles image rotation with support for:
+1. Standard rotation for JPEG, PNG and other formats  
+2. Metadata-only rotation for RAW formats (ARW, CR2, NEF, etc.)
+3. Metadata-only rotation for HEIF/HEIC formats
+4. XMP orientation metadata updates for all supported formats
+"""
+
 
 class ImageRotator:
     # Define supported image formats for different rotation types
@@ -52,33 +56,6 @@ class ImageRotator:
         ".heif",
         ".heic",
     }
-    """
-    Handles image rotation with support for:
-    1. Lossless rotation for JPEG files (using jpegtran if available)
-    2. Standard rotation for PNG and other formats
-    3. XMP orientation metadata updates for all supported formats
-    """
-
-    def __init__(self):
-        self.jpegtran_available = self._check_jpegtran_availability()
-        logger.info(f"jpegtran availability: {self.jpegtran_available}")
-
-    def _check_jpegtran_availability(self) -> bool:
-        """Check if jpegtran is available in the system PATH."""
-        try:
-            result = subprocess.run(
-                ["jpegtran", "-version"],
-                capture_output=True,
-                text=True,
-                timeout=JPEGTRAN_TIMEOUT_SECONDS,
-            )
-            return result.returncode == 0
-        except (
-            subprocess.SubprocessError,
-            FileNotFoundError,
-            subprocess.TimeoutExpired,
-        ):
-            return False
 
     def _get_current_orientation(self, image_path: str) -> int:
         """Get current EXIF orientation value (1-8, default 1)."""
@@ -144,77 +121,6 @@ def _calculate_new_orientation(
 
         return current_orientation
 
-    def _rotate_jpeg_lossless(
-        self, image_path: str, direction: RotationDirection
-    ) -> bool:
-        """
-        Perform lossless JPEG rotation using jpegtran.
-        Returns True if successful, False otherwise.
-        """
-        if not self.jpegtran_available:
-            return False
-
-        try:
-            # Map rotation direction to jpegtran parameters
-            if direction == "clockwise":
-                transform = "-rotate 90"
-            elif direction == "counterclockwise":
-                transform = "-rotate 270"
-            elif direction == "180":
-                transform = "-rotate 180"
-            else:
-                return False
-
-            # Create temporary file for output
-            with tempfile.NamedTemporaryFile(suffix=".jpg", delete=False) as temp_file:
-                temp_path = temp_file.name
-
-            # Execute jpegtran
-            cmd = f'jpegtran -copy all -perfect {transform} "{image_path}"'
-            result = subprocess.run(
-                cmd,
-                shell=True,
-                capture_output=True,
-                stdout=open(temp_path, "wb"),
-                timeout=30,
-            )
-
-            if result.returncode == 0 and os.path.getsize(temp_path) > 0:
-                # Replace original with rotated version
-                success, msg = ImageFileOperations.replace_file(temp_path, image_path)
-                if success:
-                    logger.info(
-                        f"Lossless JPEG rotation successful: {os.path.basename(image_path)}."
-                    )
-                else:
-                    logger.error(
-                        f"Lossless JPEG rotation failed during file replacement for '{os.path.basename(image_path)}': {msg}"
-                    )
-                return success
-            else:
-                logger.warning(
-                    "jpegtran command failed for '%s'. Stderr: %s",
-                    os.path.basename(image_path),
-                    result.stderr.decode(),
-                )
-                return False
-
-        except Exception as e:
-            logger.error(
-                "Error during lossless JPEG rotation for '%s': %s",
-                os.path.basename(image_path),
-                e,
-                exc_info=True,
-            )
-            return False
-        finally:
-            # Clean up temp file if it exists
-            if "temp_path" in locals() and os.path.exists(temp_path):
-                try:
-                    os.unlink(temp_path)
-                except OSError:
-                    pass
-
     def _rotate_image_standard(
         self, image_path: str, direction: RotationDirection
     ) -> bool:
@@ -429,15 +335,21 @@ def rotate_image(
                 method_used = "metadata-only"
         else:
             # Rotate the actual image pixels
-            if file_ext in self._LOSSLESS_JPEG_FORMATS and self.jpegtran_available:
-                # Try lossless JPEG rotation first
-                success = self._rotate_jpeg_lossless(image_path, direction)
-                method_used = "lossless JPEG"
-
-                if not success:
-                    # Fallback to standard rotation (lossy for JPEG)
+            if file_ext in self._LOSSLESS_JPEG_FORMATS:
+                # For JPEG, try metadata rotation first (lossless), then pixel rotation as fallback
+                metadata_success, pixel_available, msg = (
+                    self.try_metadata_rotation_first(image_path, direction)
+                )
+                if metadata_success:
+                    success = True
+                    method_used = "metadata-only (lossless)"
+                elif pixel_available:
+                    # Fallback to pixel rotation
                     success = self._rotate_image_standard(image_path, direction)
-                    method_used = "standard (lossy fallback)"
+                    method_used = "standard JPEG (quality=95, lossy fallback)"
+                else:
+                    success = False
+                    method_used = "no available rotation method"
             elif file_ext in self._LOSSLESS_HEIF_FORMATS:
                 # Use metadata-only rotation for HEIF/HEIC (lossless)
                 success = self._update_xmp_orientation(image_path, new_orientation)
@@ -496,8 +408,6 @@ def get_supported_formats(self) -> list[str]:
             .union(self._STANDARD_PIXEL_ROTATION_FORMATS)
             .union(self._RAW_FORMATS_EXIF_ONLY)
         )
-        if self.jpegtran_available:
-            formats.append(".jpg (lossless via jpegtran)")
         formats.append(
             ".heif (lossless via metadata)"
         )  # Add specific mention for HEIF/HEIC lossless
@@ -551,11 +461,8 @@ def try_metadata_rotation_first(
             raw_formats = self._RAW_FORMATS_EXIF_ONLY
 
             if file_ext in pixel_rotation_formats:
-                # Pixel rotation is possible but will be lossy (except lossless JPEG)
-                if file_ext in [".jpg", ".jpeg"] and self.jpegtran_available:
-                    message = f"Metadata rotation failed for {filename}. Lossless JPEG rotation available."
-                else:
-                    message = f"Metadata rotation failed for {filename}. Lossy pixel rotation available."
+                # Pixel rotation is possible (will be lossy for JPEG)
+                message = f"Metadata rotation failed for {filename}. Pixel rotation available."
                 return False, True, message
             elif file_ext in raw_formats:
                 # RAW files should only use metadata rotation

src/ui/menu_manager.py

@@ -7,7 +7,7 @@
 from PyQt6.QtGui import QAction, QIcon, QKeySequence
 from PyQt6.QtWidgets import QMenu, QStyle, QWidget, QWidgetAction, QHBoxLayout, QLabel
 
-from core.metadata_processor import MetadataProcessor
+from core.image_processing.image_rotator import ImageRotator
 from core.app_settings import get_recent_folders
 
 logger = logging.getLogger(__name__)
@@ -24,6 +24,9 @@ def __init__(self, main_window: "MainWindow"):
         self.dialog_manager = main_window.dialog_manager
         self.app_state = main_window.app_state
 
+        # Initialize ImageRotator for fast rotation support checking
+        self.image_rotator = ImageRotator()
+
         # --- Actions ---
         # File Menu
         self.open_folder_action: QAction
@@ -526,8 +529,8 @@ def show_image_context_menu(self, position: QPoint):
 
         menu = QMenu(main_win)
 
-        # Rotation
-        if MetadataProcessor.is_rotation_supported(file_path):
+        # Rotation - use ImageRotator's fast extension-based check to avoid PyExiv2 operations in windowed builds
+        if self.image_rotator.is_rotation_supported(file_path):
             selected_paths = main_win._get_selected_file_paths_from_view()
             num_selected = len(selected_paths) if len(selected_paths) > 1 else 1
             label_suffix = f" {num_selected} Images" if num_selected > 1 else ""

tests/test_image_rotator.py

@@ -74,8 +74,7 @@ def _create_temp_copy(self, source_path: str) -> str:
     def test_rotator_initialization(self):
         """Test that ImageRotator initializes correctly."""
         assert isinstance(self.rotator, ImageRotator)
-        # jpegtran availability might vary by system
-        assert isinstance(self.rotator.jpegtran_available, bool)
+        # Verify that ImageRotator initializes successfully without requiring external dependencies or configuration
 
     def test_get_supported_formats(self):
         """Test that supported formats are returned correctly."""
@@ -196,6 +195,95 @@ def test_rotation_error_handling_invalid_direction(self):
             )
             assert not success
 
+    def test_jpeg_metadata_first_approach(self):
+        """Test that JPEG files attempt metadata rotation first."""
+        if not any(
+            img.lower().endswith((".jpg", ".jpeg")) for img in self.sample_images
+        ):
+            pytest.skip("No JPEG sample images available")
+
+        # Find a JPEG sample
+        jpeg_sample = next(
+            (
+                img
+                for img in self.sample_images
+                if img.lower().endswith((".jpg", ".jpeg"))
+            ),
+            None,
+        )
+        if not jpeg_sample:
+            pytest.skip("No JPEG sample found")
+
+        temp_image = self._create_temp_copy(jpeg_sample)
+
+        # Test the try_metadata_rotation_first method directly
+        metadata_success, pixel_available, message = (
+            self.rotator.try_metadata_rotation_first(temp_image, "clockwise")
+        )
+
+        # Should either succeed with metadata or indicate pixel rotation is available
+        assert metadata_success or pixel_available
+        assert "metadata" in message.lower() or "pixel" in message.lower()
+        logging.info(f"JPEG metadata-first test: {message}")
+
+    def test_jpeg_rotation_method_reporting(self):
+        """Test that JPEG rotation reports the correct method used."""
+        if not any(
+            img.lower().endswith((".jpg", ".jpeg")) for img in self.sample_images
+        ):
+            pytest.skip("No JPEG sample images available")
+
+        # Find a JPEG sample
+        jpeg_sample = next(
+            (
+                img
+                for img in self.sample_images
+                if img.lower().endswith((".jpg", ".jpeg"))
+            ),
+            None,
+        )
+        if not jpeg_sample:
+            pytest.skip("No JPEG sample found")
+
+        temp_image = self._create_temp_copy(jpeg_sample)
+
+        # Perform rotation and check the method reported
+        success, message = self.rotator.rotate_clockwise(temp_image)
+
+        assert success
+        # Should report either metadata-only (lossless) or quality=95 fallback
+        assert "metadata-only" in message.lower() or "quality=95" in message.lower()
+        logging.info(f"JPEG rotation method: {message}")
+
+    def test_raw_format_metadata_only(self):
+        """Test that RAW formats only use metadata rotation."""
+        raw_extensions = [".arw", ".cr2", ".nef", ".dng"]
+        raw_sample = None
+
+        for img in self.sample_images:
+            if any(img.lower().endswith(ext) for ext in raw_extensions):
+                raw_sample = img
+                break
+
+        if not raw_sample:
+            pytest.skip("No RAW sample images available")
+
+        temp_image = self._create_temp_copy(raw_sample)
+        original_size = os.path.getsize(temp_image)
+
+        # Perform rotation on RAW file
+        success, message = self.rotator.rotate_clockwise(temp_image)
+
+        # Should succeed and use metadata-only
+        assert success
+        assert "metadata-only" in message.lower()
+        assert "raw format" in message.lower()
+
+        # File size should be nearly identical (only metadata changed)
+        new_size = os.path.getsize(temp_image)
+        assert abs(new_size - original_size) < 1024  # Less than 1KB difference
+        logging.info(f"RAW rotation: {message}")
+
 
 if __name__ == "__main__":
     # Run tests with verbose output