updated to fullscreen view ppt

app/blueprints/content.py

@@ -526,17 +526,16 @@ def process_presentation_file(filepath: str, filename: str) -> tuple[bool, str]:
             temp_ppt = temp_path / filename
             shutil.copy2(filepath, temp_ppt)
             
-            # Convert presentation to images (PNG format)
+            # Convert presentation to PDF first (for better quality)
-            # Using LibreOffice headless mode with custom resolution
             convert_cmd = [
                 libreoffice_cmd,
                 '--headless',
-                '--convert-to', 'png',
+                '--convert-to', 'pdf',
                 '--outdir', str(temp_path),
                 str(temp_ppt)
             ]
             
-            log_action('info', f'Converting presentation to images: {filename}')
+            log_action('info', f'Converting presentation to PDF: {filename}')
             
             try:
                 result = subprocess.run(
@@ -550,8 +549,40 @@ def process_presentation_file(filepath: str, filename: str) -> tuple[bool, str]:
                     log_action('error', f'LibreOffice conversion failed: {result.stderr}')
                     return True, "Presentation accepted without conversion (conversion failed)"
                 
+                # Find generated PDF file
+                pdf_files = list(temp_path.glob('*.pdf'))
+                if not pdf_files:
+                    log_action('warning', f'No PDF generated from presentation: {filename}')
+                    return True, "Presentation accepted without conversion"
+                
+                pdf_file = pdf_files[0]
+                log_action('info', f'Converting PDF to images at Full HD resolution: {pdf_file.name}')
+                
+                # Convert PDF to images using pdftoppm at Full HD resolution (1920x1080)
+                # Calculate DPI for Full HD output (assuming standard presentation is 10x7.5 inches)
+                # 1920/10 = 192 DPI for width, use 192 DPI for best quality
+                pdftoppm_cmd = [
+                    'pdftoppm',
+                    '-png',
+                    '-r', '300',  # High DPI for quality
+                    '-scale-to', '1920',  # Scale width to 1920px
+                    str(pdf_file),
+                    str(temp_path / 'slide')
+                ]
+                
+                result = subprocess.run(
+                    pdftoppm_cmd,
+                    capture_output=True,
+                    text=True,
+                    timeout=120
+                )
+                
+                if result.returncode != 0:
+                    log_action('error', f'pdftoppm conversion failed: {result.stderr}')
+                    return True, "Presentation accepted without conversion (image conversion failed)"
+                
                 # Find generated PNG files
-                png_files = sorted(temp_path.glob('*.png'))
+                png_files = sorted(temp_path.glob('slide-*.png'))
                 
                 if not png_files:
                     log_action('warning', f'No images generated from presentation: {filename}')
@@ -561,7 +592,7 @@ def process_presentation_file(filepath: str, filename: str) -> tuple[bool, str]:
                 upload_folder = current_app.config['UPLOAD_FOLDER']
                 base_name = os.path.splitext(filename)[0]
                 
-                # Move converted images to upload folder
+                # Move converted images to upload folder and resize to exact Full HD
                 slide_count = 0
                 for idx, png_file in enumerate(png_files, start=1):
                     # Create descriptive filename
@@ -570,8 +601,8 @@ def process_presentation_file(filepath: str, filename: str) -> tuple[bool, str]:
                     
                     shutil.move(str(png_file), destination)
                     
-                    # Optimize the image to Full HD (1920x1080)
+                    # Resize to exact Full HD dimensions (1920x1080) maintaining aspect ratio
-                    optimize_image_to_fullhd(destination)
+                    resize_image_to_fullhd(destination)
                     
                     slide_count += 1
                 
@@ -616,6 +647,64 @@ def create_fullhd_image(img):
     return fullhd_img
 
 
+def resize_image_to_fullhd(filepath: str) -> bool:
+    """Resize image to exactly Full HD (1920x1080) maintaining aspect ratio with centered crop or padding."""
+    try:
+        from PIL import Image
+        
+        img = Image.open(filepath)
+        target_width = 1920
+        target_height = 1080
+        
+        # Calculate aspect ratios
+        img_aspect = img.width / img.height
+        target_aspect = target_width / target_height
+        
+        if abs(img_aspect - target_aspect) < 0.01:
+            # Aspect ratio is very close, just resize
+            img_resized = img.resize((target_width, target_height), Image.Resampling.LANCZOS)
+        elif img_aspect > target_aspect:
+            # Image is wider than target, fit height and crop/pad width
+            new_height = target_height
+            new_width = int(target_height * img_aspect)
+            img_resized = img.resize((new_width, new_height), Image.Resampling.LANCZOS)
+            
+            # Crop to center if wider
+            if new_width > target_width:
+                left = (new_width - target_width) // 2
+                img_resized = img_resized.crop((left, 0, left + target_width, target_height))
+            else:
+                # Pad with white if narrower
+                result = Image.new('RGB', (target_width, target_height), (255, 255, 255))
+                offset = (target_width - new_width) // 2
+                result.paste(img_resized, (offset, 0))
+                img_resized = result
+        else:
+            # Image is taller than target, fit width and crop/pad height
+            new_width = target_width
+            new_height = int(target_width / img_aspect)
+            img_resized = img.resize((new_width, new_height), Image.Resampling.LANCZOS)
+            
+            # Crop to center if taller
+            if new_height > target_height:
+                top = (new_height - target_height) // 2
+                img_resized = img_resized.crop((0, top, target_width, top + target_height))
+            else:
+                # Pad with white if shorter
+                result = Image.new('RGB', (target_width, target_height), (255, 255, 255))
+                offset = (target_height - new_height) // 2
+                result.paste(img_resized, (0, offset))
+                img_resized = result
+        
+        # Save optimized image
+        img_resized.save(filepath, 'PNG', optimize=True, quality=95)
+        
+        return True
+    except Exception as e:
+        log_action('error', f'Image resize error: {str(e)}')
+        return False
+
+
 def optimize_image_to_fullhd(filepath: str) -> bool:
     """Optimize and resize image file to Full HD (1920x1080) maintaining aspect ratio."""
     try: