Additional refactoring

pyPhotoAlbum/asset_heal_dialog.py

@@ -3,6 +3,7 @@ Asset healing dialog for reconnecting missing images
 """
 
 import os
+import shutil
 from typing import List, Dict, Set
 from PyQt6.QtWidgets import (
     QDialog, QVBoxLayout, QHBoxLayout, QLabel, QPushButton,
@@ -207,7 +208,6 @@ class AssetHealDialog(QDialog):
                     # Copy it to the correct location
                     dest_path = os.path.join(self.project.folder_path, asset_path)
                     os.makedirs(os.path.dirname(dest_path), exist_ok=True)
-                    import shutil
                     shutil.copy2(found_path, dest_path)
                     print(f"Restored: {asset_path} from {found_path}")
                 else:

pyPhotoAlbum/async_backend.py

@@ -21,6 +21,8 @@ import threading
 from PIL import Image
 from PyQt6.QtCore import QObject, pyqtSignal
 
+from pyPhotoAlbum.image_utils import convert_to_rgba, resize_to_fit
+
 logger = logging.getLogger(__name__)
 
 
@@ -388,23 +390,16 @@ class AsyncImageLoader(QObject):
         Returns:
             Processed PIL Image
         """
-        # Load image
         img = Image.open(path)
-
-        # Convert to RGBA for consistency
-        if img.mode != 'RGBA':
-            img = img.convert('RGBA')
+        img = convert_to_rgba(img)
 
         # Downsample if target size specified (preserving aspect ratio)
         if target_size:
             max_size = target_size[0]  # Assume square target (2048, 2048)
-            if img.width > max_size or img.height > max_size:
-                # Calculate scale to fit within max_size while preserving aspect ratio
-                scale = min(max_size / img.width, max_size / img.height)
-                new_width = int(img.width * scale)
-                new_height = int(img.height * scale)
-                img = img.resize((new_width, new_height), Image.Resampling.LANCZOS)
-                logger.debug(f"Downsampled {path}: {img.size} -> ({new_width}, {new_height})")
+            original_size = img.size
+            img = resize_to_fit(img, max_size)
+            if img.size != original_size:
+                logger.debug(f"Downsampled {path}: {original_size} -> {img.size}")
 
         return img
 
@@ -721,8 +716,7 @@ class AsyncPDFGenerator(QObject):
 
             # Load and cache (unrotated - rotation is applied per-element)
             img = original_open(path, *args, **kwargs)
-            if img.mode != 'RGBA':
-                img = img.convert('RGBA')
+            img = convert_to_rgba(img)
             self.image_cache.put(Path(path), img)
             return img
 

pyPhotoAlbum/autosave_manager.py

@@ -9,7 +9,7 @@ import os
 import json
 import shutil
 from pathlib import Path
-from datetime import datetime
+from datetime import datetime, timedelta
 from typing import Optional, List, Tuple
 from pyPhotoAlbum.project_serializer import save_to_zip, load_from_zip
 
@@ -185,8 +185,6 @@ class AutosaveManager:
             max_age_hours: Maximum age in hours (default: 7 days)
             max_count: Maximum number of checkpoints to keep per project
         """
-        from datetime import timedelta
-
         now = datetime.now()
         checkpoints_by_project = {}
 

pyPhotoAlbum/commands.py

@@ -2,6 +2,7 @@
 Command pattern implementation for undo/redo functionality
 """
 
+import os
 from abc import ABC, abstractmethod
 from typing import Dict, Any, List, Optional
 from pyPhotoAlbum.models import BaseLayoutElement, ImageData, PlaceholderData, TextBoxData
@@ -21,7 +22,6 @@ def _normalize_asset_path(image_path: str, asset_manager) -> str:
     if not asset_manager or not image_path:
         return image_path
 
-    import os
     if os.path.isabs(image_path):
         return os.path.relpath(image_path, asset_manager.project_folder)
     return image_path
@@ -742,7 +742,6 @@ class CommandHistory:
         if isinstance(command, (AddElementCommand, DeleteElementCommand)):
             if isinstance(command.element, ImageData) and command.element.image_path:
                 # Convert absolute path to relative for asset manager
-                import os
                 asset_path = command.element.image_path
                 if os.path.isabs(asset_path):
                     asset_path = os.path.relpath(asset_path, self.asset_manager.project_folder)

pyPhotoAlbum/decorators.py

@@ -2,6 +2,7 @@
 Decorator system for pyPhotoAlbum ribbon UI
 """
 
+import copy
 from functools import wraps
 from typing import Optional, Callable
 
@@ -280,7 +281,6 @@ class UndoableOperation:
             current_page = instance.get_current_page() if hasattr(instance, 'get_current_page') else None
             if current_page:
                 # Deep copy elements
-                import copy
                 return [copy.deepcopy(elem.serialize()) for elem in current_page.layout.elements]
             return []
         

pyPhotoAlbum/dialogs/page_setup_dialog.py

@@ -5,6 +5,7 @@ Encapsulates all UI logic for page setup configuration,
 separating presentation from business logic.
 """
 
+import math
 from typing import Optional, Dict, Any
 from PyQt6.QtWidgets import (
     QDialog, QVBoxLayout, QHBoxLayout, QLabel,
@@ -286,7 +287,6 @@ class PageSetupDialog(QDialog):
             content_pages = sum(
                 p.get_page_count() for p in self.project.pages if not p.is_cover
             )
-            import math
             sheets = math.ceil(content_pages / 4)
             spine_width = sheets * self.thickness_spinbox.value() * 2
 

pyPhotoAlbum/gl_imports.py

@@ -0,0 +1,115 @@
+"""
+Centralized OpenGL imports for pyPhotoAlbum.
+
+Provides a single point of import for all OpenGL functions used throughout
+the application. This centralizes GL dependency management and provides
+graceful handling when OpenGL is not available (e.g., during testing).
+
+Usage:
+    from pyPhotoAlbum.gl_imports import glBegin, glEnd, GL_QUADS, GL_AVAILABLE
+
+    if GL_AVAILABLE:
+        # Safe to use GL functions
+        glBegin(GL_QUADS)
+        ...
+"""
+
+try:
+    from OpenGL.GL import (
+        # Drawing primitives
+        glBegin,
+        glEnd,
+        glVertex2f,
+        GL_QUADS,
+        GL_LINE_LOOP,
+        GL_LINES,
+        GL_TRIANGLE_FAN,
+
+        # Colors
+        glColor3f,
+        glColor4f,
+
+        # Line state
+        glLineWidth,
+        glLineStipple,
+        GL_LINE_STIPPLE,
+
+        # General state
+        glEnable,
+        glDisable,
+        GL_DEPTH_TEST,
+        GL_BLEND,
+        GL_SRC_ALPHA,
+        GL_ONE_MINUS_SRC_ALPHA,
+        glBlendFunc,
+
+        # Textures
+        glGenTextures,
+        glBindTexture,
+        glTexImage2D,
+        glTexParameteri,
+        glDeleteTextures,
+        GL_TEXTURE_2D,
+        GL_RGBA,
+        GL_UNSIGNED_BYTE,
+        GL_TEXTURE_MIN_FILTER,
+        GL_TEXTURE_MAG_FILTER,
+        GL_LINEAR,
+        glTexCoord2f,
+
+        # Matrix operations
+        glPushMatrix,
+        glPopMatrix,
+        glScalef,
+        glTranslatef,
+        glLoadIdentity,
+        glRotatef,
+
+        # Clear operations
+        glClear,
+        glClearColor,
+        GL_COLOR_BUFFER_BIT,
+        GL_DEPTH_BUFFER_BIT,
+
+        # Viewport
+        glViewport,
+        glMatrixMode,
+        glOrtho,
+        GL_PROJECTION,
+        GL_MODELVIEW,
+
+        # Info/debug
+        glGetString,
+        GL_VERSION,
+    )
+    GL_AVAILABLE = True
+
+except ImportError:
+    GL_AVAILABLE = False
+
+    # Define dummy functions/constants for when OpenGL is not available
+    # This allows the code to be imported without OpenGL for testing
+    def _gl_stub(*args, **kwargs):
+        pass
+
+    glBegin = glEnd = glVertex2f = _gl_stub
+    glColor3f = glColor4f = _gl_stub
+    glLineWidth = glLineStipple = _gl_stub
+    glEnable = glDisable = glBlendFunc = _gl_stub
+    glGenTextures = glBindTexture = glTexImage2D = _gl_stub
+    glTexParameteri = glDeleteTextures = glTexCoord2f = _gl_stub
+    glPushMatrix = glPopMatrix = glScalef = glTranslatef = _gl_stub
+    glLoadIdentity = glRotatef = _gl_stub
+    glClear = glClearColor = _gl_stub
+    glViewport = glMatrixMode = glOrtho = _gl_stub
+    glGetString = _gl_stub
+
+    # Constants
+    GL_QUADS = GL_LINE_LOOP = GL_LINES = GL_TRIANGLE_FAN = 0
+    GL_LINE_STIPPLE = GL_DEPTH_TEST = GL_BLEND = 0
+    GL_SRC_ALPHA = GL_ONE_MINUS_SRC_ALPHA = 0
+    GL_TEXTURE_2D = GL_RGBA = GL_UNSIGNED_BYTE = 0
+    GL_TEXTURE_MIN_FILTER = GL_TEXTURE_MAG_FILTER = GL_LINEAR = 0
+    GL_COLOR_BUFFER_BIT = GL_DEPTH_BUFFER_BIT = 0
+    GL_PROJECTION = GL_MODELVIEW = 0
+    GL_VERSION = 0

pyPhotoAlbum/gl_widget.py

@@ -4,11 +4,12 @@ OpenGL widget for pyPhotoAlbum rendering - refactored with mixins
 
 from PyQt6.QtOpenGLWidgets import QOpenGLWidget
 from PyQt6.QtCore import Qt
-from OpenGL.GL import *
+from pyPhotoAlbum.gl_imports import *
 
 # Import all mixins
 from pyPhotoAlbum.mixins.viewport import ViewportMixin
 from pyPhotoAlbum.mixins.rendering import RenderingMixin
+from pyPhotoAlbum.mixins.asset_path import AssetPathMixin
 from pyPhotoAlbum.mixins.asset_drop import AssetDropMixin
 from pyPhotoAlbum.mixins.page_navigation import PageNavigationMixin
 from pyPhotoAlbum.mixins.image_pan import ImagePanMixin
@@ -24,6 +25,7 @@ class GLWidget(
     AsyncLoadingMixin,
     ViewportMixin,
     RenderingMixin,
+    AssetPathMixin,
     AssetDropMixin,
     PageNavigationMixin,
     ImagePanMixin,
@@ -72,6 +74,13 @@ class GLWidget(
         self._cleanup_async_loading()
         super().closeEvent(event)
 
+    def _get_project_folder(self):
+        """Override AssetPathMixin to access project via main window."""
+        main_window = self.window()
+        if hasattr(main_window, 'project') and main_window.project:
+            return getattr(main_window.project, 'folder_path', None)
+        return None
+
     def keyPressEvent(self, event):
         """Handle key press events"""
         if event.key() == Qt.Key.Key_Delete or event.key() == Qt.Key.Key_Backspace:

pyPhotoAlbum/image_utils.py

@@ -0,0 +1,164 @@
+"""
+Centralized image processing utilities for pyPhotoAlbum.
+
+This module consolidates common image operations to avoid code duplication
+across models.py, pdf_exporter.py, and async_backend.py.
+"""
+
+from typing import Tuple
+from PIL import Image
+
+
+# =============================================================================
+# Image Processing Utilities
+# =============================================================================
+
+def apply_pil_rotation(image: Image.Image, pil_rotation_90: int) -> Image.Image:
+    """
+    Apply 90-degree rotation increments to a PIL image.
+
+    Args:
+        image: PIL Image to rotate
+        pil_rotation_90: Number of 90-degree rotations (0, 1, 2, or 3)
+
+    Returns:
+        Rotated PIL Image (or original if no rotation needed)
+    """
+    if pil_rotation_90 <= 0:
+        return image
+
+    angle = pil_rotation_90 * 90
+    if angle == 90:
+        return image.transpose(Image.ROTATE_270)  # CCW 90 = rotate right
+    elif angle == 180:
+        return image.transpose(Image.ROTATE_180)
+    elif angle == 270:
+        return image.transpose(Image.ROTATE_90)  # CCW 270 = rotate left
+
+    return image
+
+
+def convert_to_rgba(image: Image.Image) -> Image.Image:
+    """
+    Convert image to RGBA mode if not already.
+
+    Args:
+        image: PIL Image in any mode
+
+    Returns:
+        PIL Image in RGBA mode
+    """
+    if image.mode != 'RGBA':
+        return image.convert('RGBA')
+    return image
+
+
+def calculate_center_crop_coords(
+    img_width: int,
+    img_height: int,
+    target_width: float,
+    target_height: float,
+    crop_info: Tuple[float, float, float, float] = (0, 0, 1, 1)
+) -> Tuple[float, float, float, float]:
+    """
+    Calculate texture/crop coordinates for center-crop fitting an image to a target aspect ratio.
+
+    This implements the center-crop algorithm used for fitting images into frames
+    while preserving aspect ratio. The image is scaled to cover the target area,
+    then the excess is cropped equally from both sides.
+
+    Args:
+        img_width: Source image width in pixels
+        img_height: Source image height in pixels
+        target_width: Target frame width (any unit, only ratio matters)
+        target_height: Target frame height (any unit, only ratio matters)
+        crop_info: Additional crop range as (x_min, y_min, x_max, y_max) in 0-1 range
+                   Default (0, 0, 1, 1) means no additional cropping
+
+    Returns:
+        Tuple of (tx_min, ty_min, tx_max, ty_max) texture coordinates in 0-1 range
+    """
+    crop_x_min, crop_y_min, crop_x_max, crop_y_max = crop_info
+
+    img_aspect = img_width / img_height
+    target_aspect = target_width / target_height
+
+    # Calculate base texture coordinates for center crop
+    if img_aspect > target_aspect:
+        # Image is wider than target - crop horizontally
+        scale = target_aspect / img_aspect
+        tx_offset = (1.0 - scale) / 2.0
+        tx_min_base = tx_offset
+        tx_max_base = 1.0 - tx_offset
+        ty_min_base = 0.0
+        ty_max_base = 1.0
+    else:
+        # Image is taller than target - crop vertically
+        scale = img_aspect / target_aspect
+        ty_offset = (1.0 - scale) / 2.0
+        tx_min_base = 0.0
+        tx_max_base = 1.0
+        ty_min_base = ty_offset
+        ty_max_base = 1.0 - ty_offset
+
+    # Apply additional crop from crop_info (for spanning elements, user crops, etc.)
+    tx_range = tx_max_base - tx_min_base
+    ty_range = ty_max_base - ty_min_base
+
+    tx_min = tx_min_base + crop_x_min * tx_range
+    tx_max = tx_min_base + crop_x_max * tx_range
+    ty_min = ty_min_base + crop_y_min * ty_range
+    ty_max = ty_min_base + crop_y_max * ty_range
+
+    return (tx_min, ty_min, tx_max, ty_max)
+
+
+def crop_image_to_coords(
+    image: Image.Image,
+    coords: Tuple[float, float, float, float]
+) -> Image.Image:
+    """
+    Crop an image using normalized texture coordinates.
+
+    Args:
+        image: PIL Image to crop
+        coords: Tuple of (tx_min, ty_min, tx_max, ty_max) in 0-1 range
+
+    Returns:
+        Cropped PIL Image
+    """
+    tx_min, ty_min, tx_max, ty_max = coords
+    img_width, img_height = image.size
+
+    crop_left_px = int(tx_min * img_width)
+    crop_right_px = int(tx_max * img_width)
+    crop_top_px = int(ty_min * img_height)
+    crop_bottom_px = int(ty_max * img_height)
+
+    return image.crop((crop_left_px, crop_top_px, crop_right_px, crop_bottom_px))
+
+
+def resize_to_fit(
+    image: Image.Image,
+    max_size: int,
+    resample: Image.Resampling = Image.Resampling.LANCZOS
+) -> Image.Image:
+    """
+    Resize image to fit within max_size while preserving aspect ratio.
+
+    Args:
+        image: PIL Image to resize
+        max_size: Maximum dimension (width or height)
+        resample: Resampling filter (default LANCZOS for quality)
+
+    Returns:
+        Resized PIL Image, or original if already smaller
+    """
+    if image.width <= max_size and image.height <= max_size:
+        return image
+
+    scale = min(max_size / image.width, max_size / image.height)
+    new_width = int(image.width * scale)
+    new_height = int(image.height * scale)
+
+    return image.resize((new_width, new_height), resample)

pyPhotoAlbum/main.py

@@ -6,6 +6,7 @@ This version uses the mixin architecture with auto-generated ribbon configuratio
 """
 
 import sys
+from datetime import datetime
 from pathlib import Path
 from PyQt6.QtWidgets import (
     QApplication, QMainWindow, QVBoxLayout, QWidget,
@@ -23,6 +24,7 @@ from pyPhotoAlbum.autosave_manager import AutosaveManager
 
 # Import mixins
 from pyPhotoAlbum.mixins.base import ApplicationStateMixin
+from pyPhotoAlbum.mixins.asset_path import AssetPathMixin
 from pyPhotoAlbum.mixins.operations import (
     FileOperationsMixin,
     EditOperationsMixin,
@@ -41,6 +43,7 @@ from pyPhotoAlbum.mixins.operations import (
 class MainWindow(
     QMainWindow,
     ApplicationStateMixin,
+    AssetPathMixin,
     FileOperationsMixin,
     EditOperationsMixin,
     ElementOperationsMixin,
@@ -317,7 +320,6 @@ class MainWindow(
 
         # Parse timestamp for better display
         try:
-            from datetime import datetime
             timestamp = datetime.fromisoformat(timestamp_str)
             time_display = timestamp.strftime("%Y-%m-%d %H:%M:%S")
         except:

pyPhotoAlbum/merge_manager.py

@@ -7,10 +7,11 @@ This module provides functionality for:
 - Resolving conflicts based on user input or automatic strategies
 """
 
+import copy
 from typing import Dict, Any, List, Optional, Tuple
 from enum import Enum
 from dataclasses import dataclass
-from datetime import datetime
+from datetime import datetime, timezone
 
 
 class ConflictType(Enum):
@@ -369,7 +370,6 @@ class MergeManager:
             Merged project data
         """
         # Start with a copy of our project
-        import copy
         merged_data = copy.deepcopy(our_project_data)
 
         # Apply resolutions
@@ -529,8 +529,6 @@ def concatenate_projects(
     Returns:
         Combined project data
     """
-    import copy
-
     # Start with project A as base
     merged_data = copy.deepcopy(project_a_data)
 
@@ -542,7 +540,6 @@ def concatenate_projects(
 
     # Keep project A's ID and settings
     # Update last_modified to now
-    from datetime import datetime, timezone
     merged_data["last_modified"] = datetime.now(timezone.utc).isoformat()
 
     print(f"Concatenated projects: {len(project_a_data.get('pages', []))} + {len(project_b_data.get('pages', []))} = {len(merged_data['pages'])} pages")

pyPhotoAlbum/mixins/asset_drop.py

@@ -103,7 +103,6 @@ class AssetDropMixin:
 
     def _handle_drop_on_empty_space(self, image_path, x, y):
         """Handle dropping an image onto empty space"""
-        import os
         main_window = self.window()
         if not (hasattr(main_window, 'project') and main_window.project and main_window.project.pages):
             return
@@ -117,7 +116,7 @@ class AssetDropMixin:
         try:
             # Import asset first, then calculate dimensions from imported asset
             asset_path = main_window.project.asset_manager.import_asset(image_path)
-            full_asset_path = os.path.join(main_window.project.folder_path, asset_path)
+            full_asset_path = self.get_asset_full_path(asset_path)
             img_width, img_height = self._calculate_image_dimensions(full_asset_path)
 
             self._add_new_image_to_page(

pyPhotoAlbum/mixins/asset_path.py

@@ -0,0 +1,68 @@
+"""
+Asset path resolution mixin for components that need to resolve asset paths.
+"""
+
+import os
+from typing import Optional
+
+
+class AssetPathMixin:
+    """
+    Mixin providing asset path resolution functionality.
+
+    Requires access to self.project (typically via ApplicationStateMixin).
+    """
+
+    def resolve_asset_path(self, asset_path: str) -> Optional[str]:
+        """
+        Resolve a relative asset path to an absolute path.
+
+        Args:
+            asset_path: Relative path (e.g., "assets/photo.jpg") or absolute path
+
+        Returns:
+            Absolute path if the asset exists, None otherwise
+        """
+        if not asset_path:
+            return None
+
+        # Handle absolute paths
+        if os.path.isabs(asset_path):
+            if os.path.exists(asset_path):
+                return asset_path
+            return None
+
+        # Resolve relative path using project folder
+        project_folder = self._get_project_folder()
+        if project_folder:
+            full_path = os.path.join(project_folder, asset_path)
+            if os.path.exists(full_path):
+                return full_path
+
+        return None
+
+    def get_asset_full_path(self, relative_path: str) -> Optional[str]:
+        """
+        Get the full path for a relative asset path (without existence check).
+
+        Args:
+            relative_path: Relative path from project folder
+
+        Returns:
+            Full absolute path, or None if no project folder
+        """
+        project_folder = self._get_project_folder()
+        if project_folder and relative_path:
+            return os.path.join(project_folder, relative_path)
+        return None
+
+    def _get_project_folder(self) -> Optional[str]:
+        """
+        Get the current project folder.
+
+        Override this method if the project is accessed differently.
+        Default implementation uses self.project.folder_path.
+        """
+        if hasattr(self, 'project') and self.project:
+            return getattr(self.project, 'folder_path', None)
+        return None

pyPhotoAlbum/mixins/async_loading.py

@@ -2,6 +2,7 @@
 Async loading mixin for non-blocking image loading and PDF generation.
 """
 
+import os
 from pathlib import Path
 from typing import Optional
 import logging
@@ -168,33 +169,17 @@ class AsyncLoadingMixin:
         if not image_data.image_path:
             return
 
-        # Resolve path - only load from project's assets folder
-        # Search paths are only used for healing, not for async loading
-        from pyPhotoAlbum.models import get_asset_search_paths
-        import os
-
-        # Only load images that are properly in the assets folder
-        # Paths must be relative and start with "assets/"
-        if os.path.isabs(image_data.image_path):
-            logger.warning(f"Skipping absolute path (needs healing): {image_data.image_path}")
-            return
-
+        # Security: only load images from the assets folder
         if not image_data.image_path.startswith("assets/"):
             logger.warning(f"Skipping path not in assets folder (needs healing): {image_data.image_path}")
             return
 
-        project_folder, _ = get_asset_search_paths()
-        if not project_folder:
-            logger.warning("No project folder set, cannot load image")
+        # Use ImageData's path resolution (delegates to project layer)
+        image_full_path = image_data.resolve_image_path()
+        if not image_full_path:
+            logger.warning(f"Image not found (needs healing): {image_data.image_path}")
             return
 
-        full_path = os.path.join(project_folder, image_data.image_path)
-        if not os.path.exists(full_path):
-            logger.warning(f"Image not found in assets (needs healing): {image_data.image_path}")
-            return
-
-        image_full_path = full_path
-
         # Calculate target size (max 2048px like original)
         target_size = (2048, 2048)  # Will be downsampled if larger
 

pyPhotoAlbum/mixins/mouse_interaction.py

@@ -2,6 +2,8 @@
 Mouse interaction mixin for GLWidget - coordinates all mouse events
 """
 
+import math
+
 from PyQt6.QtCore import Qt
 from pyPhotoAlbum.models import ImageData
 
@@ -150,8 +152,6 @@ class MouseInteractionMixin:
 
             elif self.rotation_mode:
                 # Rotation mode
-                import math
-
                 if not hasattr(self.selected_element, '_page_renderer'):
                     return
 

pyPhotoAlbum/mixins/operations/element_ops.py

@@ -39,12 +39,11 @@ class ElementOperationsMixin:
             return
         
         try:
-            import os
             # Import asset to project
             asset_path = self.project.asset_manager.import_asset(file_path)
 
             # Get dimensions using centralized utility (max 300px for UI display)
-            full_asset_path = os.path.join(self.project.folder_path, asset_path)
+            full_asset_path = self.get_asset_full_path(asset_path)
             dimensions = get_image_dimensions(full_asset_path, max_size=300)
             if dimensions:
                 img_width, img_height = dimensions

pyPhotoAlbum/mixins/operations/file_ops.py

@@ -2,6 +2,8 @@
 File operations mixin for pyPhotoAlbum
 """
 
+import os
+
 from PyQt6.QtWidgets import (
     QFileDialog, QDialog, QVBoxLayout, QHBoxLayout, QLabel,
     QDoubleSpinBox, QSpinBox, QPushButton, QGroupBox, QRadioButton,
@@ -312,7 +314,6 @@ class FileOperationsMixin:
 
     def _check_missing_assets(self) -> list:
         """Check for missing assets in the project - returns list of missing paths"""
-        import os
         from pyPhotoAlbum.models import ImageData
 
         missing = []
@@ -326,9 +327,8 @@ class FileOperationsMixin:
                     elif not element.image_path.startswith("assets/"):
                         missing.append(element.image_path)
                     else:
-                        # Check if file exists in assets
-                        full_path = os.path.join(self.project.folder_path, element.image_path)
-                        if not os.path.exists(full_path):
+                        # Check if file exists in assets using mixin
+                        if not self.resolve_asset_path(element.image_path):
                             missing.append(element.image_path)
         return list(set(missing))  # Remove duplicates
 

pyPhotoAlbum/mixins/rendering.py

@@ -2,7 +2,9 @@
 Rendering mixin for GLWidget - handles OpenGL rendering
 """
 
-from OpenGL.GL import *
+import math
+
+from pyPhotoAlbum.gl_imports import *
 from PyQt6.QtGui import QPainter, QFont, QColor, QPen
 from PyQt6.QtCore import Qt, QRectF
 from pyPhotoAlbum.models import TextBoxData
@@ -152,7 +154,6 @@ class RenderingMixin:
         glLineWidth(1.0)
 
         if self.rotation_mode:
-            import math
             handle_radius = 6
             handles = [(x, y), (x + w, y), (x, y + h), (x + w, y + h)]
 

pyPhotoAlbum/mixins/viewport.py

@@ -2,7 +2,7 @@
 Viewport mixin for GLWidget - handles zoom and pan
 """
 
-from OpenGL.GL import *
+from pyPhotoAlbum.gl_imports import *
 
 
 class ViewportMixin:

pyPhotoAlbum/models.py

@@ -11,6 +11,18 @@ import uuid
 from datetime import datetime, timezone
 from PIL import Image
 
+from pyPhotoAlbum.image_utils import apply_pil_rotation, calculate_center_crop_coords
+from pyPhotoAlbum.gl_imports import (
+    GL_AVAILABLE, glBegin, glEnd, glVertex2f, glColor3f, glColor4f,
+    GL_QUADS, GL_LINE_LOOP, glEnable, glDisable, GL_TEXTURE_2D,
+    glBindTexture, glTexCoord2f, glTexParameteri, GL_TEXTURE_MIN_FILTER,
+    GL_TEXTURE_MAG_FILTER, GL_LINEAR, glGenTextures, glTexImage2D,
+    GL_RGBA, GL_UNSIGNED_BYTE, glDeleteTextures, glGetString, GL_VERSION,
+    glLineStipple, GL_LINE_STIPPLE, glPushMatrix, glPopMatrix,
+    glTranslatef, glRotatef, GL_BLEND, glBlendFunc, GL_SRC_ALPHA,
+    GL_ONE_MINUS_SRC_ALPHA,
+)
+
 logger = logging.getLogger(__name__)
 
 # Global configuration for asset path resolution
@@ -171,9 +183,6 @@ class ImageData(BaseLayoutElement):
 
     def render(self):
         """Render the image using OpenGL"""
-        from OpenGL.GL import (glBegin, glEnd, glVertex2f, glColor3f, glColor4f, GL_QUADS, GL_LINE_LOOP,
-                               glEnable, glDisable, GL_TEXTURE_2D, glBindTexture, glTexCoord2f,
-                               glTexParameteri, GL_TEXTURE_MIN_FILTER, GL_TEXTURE_MAG_FILTER, GL_LINEAR)
 
         x, y = self.position
         w, h = self.size
@@ -197,39 +206,10 @@ class ImageData(BaseLayoutElement):
                 # No dimensions available, render without aspect ratio correction
                 img_width, img_height = int(w), int(h)
 
-            # Get crop info
-            crop_x_min, crop_y_min, crop_x_max, crop_y_max = self.crop_info
-
-            # Calculate aspect ratios for center crop
-            img_aspect = img_width / img_height
-            target_aspect = w / h
-
-            # Calculate texture coordinates for center crop
-            if img_aspect > target_aspect:
-                # Image is wider - crop horizontally
-                scale = target_aspect / img_aspect
-                tx_offset = (1.0 - scale) / 2.0
-                tx_min_base = tx_offset
-                tx_max_base = 1.0 - tx_offset
-                ty_min_base = 0.0
-                ty_max_base = 1.0
-            else:
-                # Image is taller - crop vertically
-                scale = img_aspect / target_aspect
-                ty_offset = (1.0 - scale) / 2.0
-                tx_min_base = 0.0
-                tx_max_base = 1.0
-                ty_min_base = ty_offset
-                ty_max_base = 1.0 - ty_offset
-
-            # Apply additional crop from crop_info (for spanning elements)
-            tx_range = tx_max_base - tx_min_base
-            ty_range = ty_max_base - ty_min_base
-
-            tx_min = tx_min_base + crop_x_min * tx_range
-            tx_max = tx_min_base + crop_x_max * tx_range
-            ty_min = ty_min_base + crop_y_min * ty_range
-            ty_max = ty_min_base + crop_y_max * ty_range
+            # Calculate texture coordinates for center crop with element's crop_info
+            tx_min, ty_min, tx_max, ty_max = calculate_center_crop_coords(
+                img_width, img_height, w, h, self.crop_info
+            )
 
             # Enable texturing and draw with crop
             glEnable(GL_TEXTURE_2D)
@@ -334,16 +314,8 @@ class ImageData(BaseLayoutElement):
 
             # Apply PIL-level rotation if needed
             if hasattr(self, 'pil_rotation_90') and self.pil_rotation_90 > 0:
-                # Rotate counter-clockwise by 90° * pil_rotation_90
-                # PIL.Image.ROTATE_90 rotates counter-clockwise
-                angle = self.pil_rotation_90 * 90
-                if angle == 90:
-                    pil_image = pil_image.transpose(Image.ROTATE_270)  # CCW 90 = rotate right
-                elif angle == 180:
-                    pil_image = pil_image.transpose(Image.ROTATE_180)
-                elif angle == 270:
-                    pil_image = pil_image.transpose(Image.ROTATE_90)  # CCW 270 = rotate left
-                logger.debug(f"ImageData: Applied PIL rotation {angle}° to {self.image_path}")
+                pil_image = apply_pil_rotation(pil_image, self.pil_rotation_90)
+                logger.debug(f"ImageData: Applied PIL rotation {self.pil_rotation_90 * 90}° to {self.image_path}")
 
             # Store the image for texture creation during next render()
             # This avoids GL context issues when callback runs on wrong thread/timing
@@ -370,11 +342,6 @@ class ImageData(BaseLayoutElement):
         if not hasattr(self, '_pending_pil_image') or self._pending_pil_image is None:
             return False
 
-        from OpenGL.GL import (glGenTextures, glBindTexture, glTexImage2D, GL_TEXTURE_2D,
-                               glTexParameteri, GL_TEXTURE_MIN_FILTER, GL_TEXTURE_MAG_FILTER,
-                               GL_LINEAR, GL_RGBA, GL_UNSIGNED_BYTE, glDeleteTextures,
-                               glGetString, GL_VERSION)
-
         try:
             # Verify GL context is actually current before creating textures
             # glGetString returns None if no context is active
@@ -454,8 +421,6 @@ class PlaceholderData(BaseLayoutElement):
 
     def render(self):
         """Render the placeholder using OpenGL"""
-        from OpenGL.GL import (glBegin, glEnd, glVertex2f, glColor3f, GL_QUADS, GL_LINE_LOOP, glLineStipple, 
-                               glEnable, glDisable, GL_LINE_STIPPLE, glPushMatrix, glPopMatrix, glTranslatef, glRotatef)
 
         x, y = self.position
         w, h = self.size
@@ -535,10 +500,6 @@ class TextBoxData(BaseLayoutElement):
 
     def render(self):
         """Render the text box using OpenGL"""
-        from OpenGL.GL import (glBegin, glEnd, glVertex2f, glColor3f, glColor4f, GL_QUADS, GL_LINE_LOOP,
-                               glEnable, glDisable, GL_BLEND, glBlendFunc, GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA,
-                               glPushMatrix, glPopMatrix, glTranslatef, glRotatef)
-        
         x, y = self.position
         w, h = self.size
         
@@ -623,9 +584,6 @@ class GhostPageData(BaseLayoutElement):
 
     def render(self):
         """Render the ghost page with 'Add Page' button in page-local coordinates"""
-        from OpenGL.GL import (glBegin, glEnd, glVertex2f, glColor3f, glColor4f, GL_QUADS, GL_LINE_LOOP,
-                               glEnable, glDisable, GL_BLEND, glBlendFunc, GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA,
-                               glLineStipple, GL_LINE_STIPPLE)
 
         # Render at page origin (0,0) in page-local coordinates
         # PageRenderer will handle transformation to screen coordinates

pyPhotoAlbum/page_layout.py

@@ -5,6 +5,12 @@ Page layout and template system for pyPhotoAlbum
 from typing import List, Dict, Any, Optional, Tuple
 from pyPhotoAlbum.models import BaseLayoutElement, ImageData, PlaceholderData, TextBoxData
 from pyPhotoAlbum.snapping import SnappingSystem
+from pyPhotoAlbum.gl_imports import (
+    glBegin, glEnd, glVertex2f, glColor3f, glColor4f,
+    GL_QUADS, GL_LINE_LOOP, GL_LINES, glLineWidth,
+    glEnable, glDisable, GL_DEPTH_TEST, GL_BLEND,
+    glBlendFunc, GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA,
+)
 
 class PageLayout:
     """Class to manage page layout and templates"""
@@ -50,8 +56,6 @@ class PageLayout:
             dpi: Working DPI for converting mm to pixels
             project: Optional project instance for global snapping settings
         """
-        from OpenGL.GL import glBegin, glEnd, glVertex2f, glColor3f, GL_QUADS, GL_LINE_LOOP, GL_LINES, glLineWidth, glDisable, glEnable, GL_DEPTH_TEST
-        
         # Disable depth testing for 2D rendering
         glDisable(GL_DEPTH_TEST)
         
@@ -143,10 +147,6 @@ class PageLayout:
     
     def _render_snap_lines(self, dpi: int, page_x: float, page_y: float, project=None):
         """Render snap lines (grid, edges, guides)"""
-        from OpenGL.GL import (glColor3f, glColor4f, glLineWidth, glBegin, glEnd,
-                               glVertex2f, GL_LINES, glEnable, glDisable, GL_BLEND,
-                               glBlendFunc, GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA)
-
         # Use project settings if available, otherwise fall back to local snapping_system
         if project:
             # Use project-level global settings

pyPhotoAlbum/page_renderer.py

@@ -11,7 +11,7 @@ Coordinate Systems:
 """
 
 from typing import Tuple, Optional
-from OpenGL.GL import glPushMatrix, glPopMatrix, glScalef, glTranslatef
+from pyPhotoAlbum.gl_imports import glPushMatrix, glPopMatrix, glScalef, glTranslatef
 
 
 class PageRenderer:

pyPhotoAlbum/pdf_exporter.py

@@ -14,6 +14,12 @@ from reportlab.lib.enums import TA_LEFT, TA_CENTER, TA_RIGHT
 from PIL import Image
 import math
 from pyPhotoAlbum.models import ImageData, TextBoxData, PlaceholderData
+from pyPhotoAlbum.image_utils import (
+    apply_pil_rotation,
+    convert_to_rgba,
+    calculate_center_crop_coords,
+    crop_image_to_coords,
+)
 
 
 @dataclass
@@ -429,73 +435,36 @@ class PDFExporter:
         try:
             # Load image using resolved path
             img = Image.open(image_full_path)
-            img = img.convert('RGBA')
+            img = convert_to_rgba(img)
 
-            # Apply PIL-level rotation if needed (same logic as _on_async_image_loaded in models.py)
+            # Apply PIL-level rotation if needed
             if hasattr(ctx.image_element, 'pil_rotation_90') and ctx.image_element.pil_rotation_90 > 0:
-                # Rotate counter-clockwise by 90° * pil_rotation_90
-                # PIL.Image.ROTATE_90 rotates counter-clockwise
-                angle = ctx.image_element.pil_rotation_90 * 90
-                if angle == 90:
-                    img = img.transpose(Image.ROTATE_270)  # CCW 90 = rotate right
-                elif angle == 180:
-                    img = img.transpose(Image.ROTATE_180)
-                elif angle == 270:
-                    img = img.transpose(Image.ROTATE_90)  # CCW 270 = rotate left
+                img = apply_pil_rotation(img, ctx.image_element.pil_rotation_90)
 
-            # Apply element's crop_info (from the element's own cropping)
+            # Get element's crop_info and combine with split cropping if applicable
             crop_x_min, crop_y_min, crop_x_max, crop_y_max = ctx.image_element.crop_info
-
-            # Combine with split cropping if applicable
             final_crop_x_min = crop_x_min + (crop_x_max - crop_x_min) * ctx.crop_left
             final_crop_x_max = crop_x_min + (crop_x_max - crop_x_min) * ctx.crop_right
 
-            # Calculate pixel crop coordinates
-            img_width, img_height = img.size
-            
-            # Apply center crop first (matching the render logic in models.py)
-            img_aspect = img_width / img_height
-            # Use original dimensions for aspect ratio if provided (for split images)
-            # This prevents stretching when splitting an image across pages
+            # Determine target dimensions for aspect ratio
+            # Use original dimensions for split images to prevent stretching
             if ctx.original_width_pt is not None and ctx.original_height_pt is not None:
-                target_aspect = ctx.original_width_pt / ctx.original_height_pt
+                target_width = ctx.original_width_pt
+                target_height = ctx.original_height_pt
             else:
-                target_aspect = ctx.width_pt / ctx.height_pt
+                target_width = ctx.width_pt
+                target_height = ctx.height_pt
 
-            if img_aspect > target_aspect:
-                # Image is wider - crop horizontally
-                scale = target_aspect / img_aspect
-                tx_offset = (1.0 - scale) / 2.0
-                tx_min_base = tx_offset
-                tx_max_base = 1.0 - tx_offset
-                ty_min_base = 0.0
-                ty_max_base = 1.0
-            else:
-                # Image is taller - crop vertically
-                scale = img_aspect / target_aspect
-                ty_offset = (1.0 - scale) / 2.0
-                tx_min_base = 0.0
-                tx_max_base = 1.0
-                ty_min_base = ty_offset
-                ty_max_base = 1.0 - ty_offset
-            
-            # Apply element crop_info range
-            tx_range = tx_max_base - tx_min_base
-            ty_range = ty_max_base - ty_min_base
-            
-            tx_min = tx_min_base + final_crop_x_min * tx_range
-            tx_max = tx_min_base + final_crop_x_max * tx_range
-            ty_min = ty_min_base + crop_y_min * ty_range
-            ty_max = ty_min_base + crop_y_max * ty_range
-            
-            # Convert to pixel coordinates
-            crop_left_px = int(tx_min * img_width)
-            crop_right_px = int(tx_max * img_width)
-            crop_top_px = int(ty_min * img_height)
-            crop_bottom_px = int(ty_max * img_height)
+            # Calculate center crop coordinates
+            img_width, img_height = img.size
+            crop_coords = calculate_center_crop_coords(
+                img_width, img_height,
+                target_width, target_height,
+                (final_crop_x_min, crop_y_min, final_crop_x_max, crop_y_max)
+            )
 
             # Crop the image
-            cropped_img = img.crop((crop_left_px, crop_top_px, crop_right_px, crop_bottom_px))
+            cropped_img = crop_image_to_coords(img, crop_coords)
             
             # Downsample image to target resolution based on export DPI
             # This prevents embedding huge images and reduces PDF file size

pyPhotoAlbum/snapping.py

@@ -3,6 +3,7 @@ Snapping system for pyPhotoAlbum
 Provides grid snapping, edge snapping, and custom guide snapping
 """
 
+import math
 from typing import List, Tuple, Optional
 from dataclasses import dataclass
 
@@ -93,8 +94,6 @@ class SnappingSystem:
         Returns:
             Snapped position (x, y) in pixels
         """
-        import math
-
         x, y = position
         width, height = size
         page_width_mm, page_height_mm = page_size

pyPhotoAlbum/version_manager.py

@@ -2,8 +2,10 @@
 Version management and migration system for pyPhotoAlbum projects
 """
 
-from typing import Dict, Any, Optional, Callable, List
 import os
+import uuid
+from datetime import datetime, timezone
+from typing import Dict, Any, Optional, Callable, List
 
 
 # Current data version - increment when making breaking changes to data format
@@ -193,9 +195,6 @@ def migrate_2_0_to_3_0(data: Dict[str, Any]) -> Dict[str, Any]:
     - Add project_id to project
     - Add deletion tracking (deleted, deleted_at) to pages and elements
     """
-    import uuid
-    from datetime import datetime, timezone
-
     print("Migration 2.0 → 3.0: Adding UUIDs, timestamps, and project_id")
 
     # Get current timestamp for migration

tests/test_asset_drop_mixin.py

@@ -8,6 +8,7 @@ from PyQt6.QtCore import QMimeData, QUrl, QPoint
 from PyQt6.QtGui import QDragEnterEvent, QDragMoveEvent, QDropEvent
 from PyQt6.QtOpenGLWidgets import QOpenGLWidget
 from pyPhotoAlbum.mixins.asset_drop import AssetDropMixin
+from pyPhotoAlbum.mixins.asset_path import AssetPathMixin
 from pyPhotoAlbum.mixins.viewport import ViewportMixin
 from pyPhotoAlbum.mixins.page_navigation import PageNavigationMixin
 from pyPhotoAlbum.project import Project, Page
@@ -16,14 +17,21 @@ from pyPhotoAlbum.models import ImageData
 
 
 # Create test widget combining necessary mixins
-class TestAssetDropWidget(AssetDropMixin, PageNavigationMixin, ViewportMixin, QOpenGLWidget):
-    """Test widget combining asset drop, page navigation, and viewport mixins"""
+class TestAssetDropWidget(AssetDropMixin, AssetPathMixin, PageNavigationMixin, ViewportMixin, QOpenGLWidget):
+    """Test widget combining asset drop, asset path, page navigation, and viewport mixins"""
 
     def _get_element_at(self, x, y):
         """Mock implementation for testing"""
         # Will be overridden in tests that need it
         return None
 
+    def _get_project_folder(self):
+        """Override to access project via window mock"""
+        main_window = self.window()
+        if hasattr(main_window, 'project') and main_window.project:
+            return getattr(main_window.project, 'folder_path', None)
+        return None
+
 
 class TestAssetDropInitialization:
     """Test AssetDropMixin initialization"""

tests/test_element_ops_mixin.py

@@ -6,6 +6,7 @@ import pytest
 from unittest.mock import Mock, MagicMock, patch, mock_open
 from PyQt6.QtWidgets import QMainWindow, QFileDialog
 from pyPhotoAlbum.mixins.operations.element_ops import ElementOperationsMixin
+from pyPhotoAlbum.mixins.asset_path import AssetPathMixin
 from pyPhotoAlbum.models import ImageData, TextBoxData, PlaceholderData
 from pyPhotoAlbum.project import Project, Page
 from pyPhotoAlbum.page_layout import PageLayout
@@ -13,7 +14,7 @@ from pyPhotoAlbum.commands import CommandHistory
 
 
 # Create test window with ElementOperationsMixin
-class TestElementWindow(ElementOperationsMixin, QMainWindow):
+class TestElementWindow(ElementOperationsMixin, AssetPathMixin, QMainWindow):
     """Test window with element operations mixin"""
 
     def __init__(self):
@@ -23,10 +24,10 @@ class TestElementWindow(ElementOperationsMixin, QMainWindow):
         self.gl_widget = Mock()
 
         # Mock project
-        self.project = Mock()
-        self.project.history = CommandHistory()
-        self.project.asset_manager = Mock()
-        self.project.folder_path = "/tmp/test_project"
+        self._project = Mock()
+        self._project.history = CommandHistory()
+        self._project.asset_manager = Mock()
+        self._project.folder_path = "/tmp/test_project"
 
         # Track method calls
         self._update_view_called = False
@@ -35,6 +36,10 @@ class TestElementWindow(ElementOperationsMixin, QMainWindow):
         self._require_page_called = False
         self._current_page_index = 0
 
+    @property
+    def project(self):
+        return self._project
+
     def require_page(self):
         """Track require_page calls"""
         self._require_page_called = True