import logging import time from PIL import ImageFont, Image, ImageDraw import freetype import os from .display_manager import DisplayManager logger = logging.getLogger(__name__) class TextDisplay: def __init__(self, display_manager: DisplayManager, config: dict): self.display_manager = display_manager self.config = config.get('text_display', {}) self.text = self.config.get('text', "Hello, World!") self.font_path = self.config.get('font_path', "assets/fonts/PressStart2P-Regular.ttf") self.font_size = self.config.get('font_size', 8) self.scroll_enabled = self.config.get('scroll', False) self.text_color = tuple(self.config.get('text_color', [255, 255, 255])) self.bg_color = tuple(self.config.get('background_color', [0, 0, 0])) # scroll_gap_width defaults to the width of the display matrix self.scroll_gap_width = self.config.get('scroll_gap_width', self.display_manager.matrix.width) self.font = self._load_font() self.text_content_width = 0 # Pixel width of the actual text string self.text_image_cache = None # For pre-rendered text (PIL.Image) self.cached_total_scroll_width = 0 # Total width of the cache: text_content_width + scroll_gap_width self._regenerate_renderings() # Initial creation of cache and width calculation self.scroll_pos = 0.0 # Use float for precision self.last_update_time = time.time() self.scroll_speed = self.config.get('scroll_speed', 30) # Pixels per second def _regenerate_renderings(self): """Calculate text width and attempt to create/update the text image cache.""" if not self.text or not self.font: self.text_content_width = 0 self.text_image_cache = None self.cached_total_scroll_width = 0 return try: self.text_content_width = self.display_manager.get_text_width(self.text, self.font) except Exception as e: logger.error(f"Error calculating text content width: {e}") self.text_content_width = 0 self.text_image_cache = None self.cached_total_scroll_width = 0 return self._create_text_image_cache() self.scroll_pos = 0.0 # Reset scroll position when text/font/colors change def _create_text_image_cache(self): """Pre-render the text onto an image if using a TTF font. Includes a trailing gap.""" self.text_image_cache = None # Clear previous cache self.cached_total_scroll_width = 0 if not self.text or not self.font or self.text_content_width == 0: return if isinstance(self.font, freetype.Face): logger.info("TextDisplay: Pre-rendering cache is not used for BDF/freetype fonts. Will use direct drawing.") # For BDF, the "scroll width" for reset purposes is handled by the direct drawing logic's conditions return # --- TTF Caching Path --- try: dummy_img = Image.new('RGB', (1, 1)) dummy_draw = ImageDraw.Draw(dummy_img) bbox = dummy_draw.textbbox((0, 0), self.text, font=self.font) actual_text_render_height = bbox[3] - bbox[1] # Total width of the cache is the text width plus the configured gap self.cached_total_scroll_width = self.text_content_width + self.scroll_gap_width cache_height = self.display_manager.matrix.height self.text_image_cache = Image.new('RGB', (self.cached_total_scroll_width, cache_height), self.bg_color) draw_cache = ImageDraw.Draw(self.text_image_cache) desired_top_edge = (cache_height - actual_text_render_height) // 2 y_draw_on_cache = desired_top_edge - bbox[1] # Draw the text at the beginning of the cache draw_cache.text((0, y_draw_on_cache), self.text, font=self.font, fill=self.text_color) # The rest of the image (the gap) is already bg_color logger.info(f"TextDisplay: Created text cache for '{self.text[:30]}...' (TTF). Text width: {self.text_content_width}, Gap: {self.scroll_gap_width}, Total cache width: {self.cached_total_scroll_width}x{cache_height}") except Exception as e: logger.error(f"TextDisplay: Failed to create text image cache: {e}", exc_info=True) self.text_image_cache = None self.cached_total_scroll_width = 0 def _load_font(self): """Load the specified font file (TTF or BDF).""" font_path = self.font_path if not os.path.isabs(font_path) and not font_path.startswith('assets/'): base_path = os.path.abspath(os.path.join(os.path.dirname(__file__), '..')) font_path = os.path.join(base_path, font_path) elif not os.path.isabs(font_path) and font_path.startswith('assets/'): base_path = os.path.abspath(os.path.join(os.path.dirname(__file__), '..')) font_path = os.path.join(base_path, font_path) logger.info(f"Attempting to load font: {font_path} at size {self.font_size}") if not os.path.exists(font_path): logger.error(f"Font file not found: {font_path}. Falling back to default.") return self.display_manager.regular_font try: if font_path.lower().endswith('.ttf'): font = ImageFont.truetype(font_path, self.font_size) logger.info(f"Loaded TTF font: {self.font_path}") return font elif font_path.lower().endswith('.bdf'): face = freetype.Face(font_path) face.set_pixel_sizes(0, self.font_size) logger.info(f"Loaded BDF font: {self.font_path} with freetype") return face else: logger.warning(f"Unsupported font type: {font_path}. Falling back.") return self.display_manager.regular_font except Exception as e: logger.error(f"Failed to load font {font_path}: {e}", exc_info=True) return self.display_manager.regular_font # _calculate_text_width is effectively replaced by logic in _regenerate_renderings # but kept for direct calls if ever needed, or as a reference to DisplayManager's method def _calculate_text_width(self): """DEPRECATED somewhat: Get text width. Relies on self.text_content_width set by _regenerate_renderings.""" try: return self.display_manager.get_text_width(self.text, self.font) except Exception as e: logger.error(f"Error calculating text width: {e}") return 0 def update(self): """Update scroll position if scrolling is enabled.""" # Scrolling is only meaningful if the actual text content is wider than the screen, # or if a cache is used (which implies scrolling over text + gap). # The condition self.text_content_width <= self.display_manager.matrix.width handles non-scrolling for static text. if not self.scroll_enabled or (not self.text_image_cache and self.text_content_width <= self.display_manager.matrix.width): self.scroll_pos = 0.0 return current_time = time.time() delta_time = current_time - self.last_update_time self.last_update_time = current_time scroll_delta = delta_time * self.scroll_speed self.scroll_pos += scroll_delta if self.text_image_cache: # Using cached image: scroll_pos loops over the total cache width (text + gap) if self.cached_total_scroll_width > 0 and self.scroll_pos >= self.cached_total_scroll_width: self.scroll_pos %= self.cached_total_scroll_width else: # Not using cache (e.g., BDF direct drawing): # Reset when text fully scrolled past left edge + matrix width (original behavior creating a conceptual gap) # self.text_content_width is used here as it refers to the actual text being drawn directly. if self.text_content_width > 0 and self.scroll_pos > self.text_content_width + self.display_manager.matrix.width: self.scroll_pos = 0.0 def display(self): """Draw the text onto the display manager's canvas.""" dm = self.display_manager matrix_width = dm.matrix.width matrix_height = dm.matrix.height dm.image = Image.new('RGB', (matrix_width, matrix_height), self.bg_color) dm.draw = ImageDraw.Draw(dm.image) if not self.text or self.text_content_width == 0: dm.update_display() return # Use pre-rendered cache if available and scrolling is active # Scrolling via cache is only relevant if the actual text content itself is wider than the matrix, # or if we want to scroll a short text with a large gap. # The self.cached_total_scroll_width > matrix_width implies the content (text+gap) is scrollable. if self.text_image_cache and self.scroll_enabled and self.cached_total_scroll_width > matrix_width : current_scroll_int = int(self.scroll_pos) source_x1 = current_scroll_int source_x2 = current_scroll_int + matrix_width if source_x2 <= self.cached_total_scroll_width: segment = self.text_image_cache.crop((source_x1, 0, source_x2, matrix_height)) dm.image.paste(segment, (0, 0)) else: # Wrap-around: paste two parts from cache width1 = self.cached_total_scroll_width - source_x1 if width1 > 0: segment1 = self.text_image_cache.crop((source_x1, 0, self.cached_total_scroll_width, matrix_height)) dm.image.paste(segment1, (0, 0)) remaining_width_for_screen = matrix_width - width1 if remaining_width_for_screen > 0: segment2 = self.text_image_cache.crop((0, 0, remaining_width_for_screen, matrix_height)) dm.image.paste(segment2, (width1 if width1 > 0 else 0, 0)) else: # Fallback: Direct drawing (BDF, static TTF, or TTF text that fits screen and isn't forced to scroll by gap) final_y_for_draw = 0 try: if isinstance(self.font, freetype.Face): text_render_height = self.font.size.height >> 6 final_y_for_draw = (matrix_height - text_render_height) // 2 else: pil_bbox = dm.draw.textbbox((0, 0), self.text, font=self.font) text_render_height = pil_bbox[3] - pil_bbox[1] final_y_for_draw = (matrix_height - text_render_height) // 2 - pil_bbox[1] except Exception as e: logger.warning(f"TextDisplay: Could not calculate text height for direct drawing: {e}. Using y=0.", exc_info=True) final_y_for_draw = 0 if self.scroll_enabled and self.text_content_width > matrix_width: # Scrolling text (direct drawing path, e.g., for BDF) x_draw_pos = matrix_width - int(self.scroll_pos) # scroll_pos for BDF already considers a type of gap for reset dm.draw_text( text=self.text, x=x_draw_pos, y=final_y_for_draw, color=self.text_color, font=self.font ) else: # Static text (centered horizontally) x_draw_pos = (matrix_width - self.text_content_width) // 2 dm.draw_text( text=self.text, x=x_draw_pos, y=final_y_for_draw, color=self.text_color, font=self.font ) dm.update_display() def set_text(self, new_text: str): self.text = new_text self._regenerate_renderings() def set_font(self, font_path: str, font_size: int): self.font_path = font_path self.font_size = font_size self.font = self._load_font() self._regenerate_renderings() def set_color(self, text_color: tuple, bg_color: tuple): self.text_color = text_color self.bg_color = bg_color self._regenerate_renderings() def set_scroll_enabled(self, enabled: bool): self.scroll_enabled = enabled self.scroll_pos = 0.0 # Cache regeneration is not strictly needed, display logic handles scroll_enabled. def set_scroll_speed(self, speed: float): self.scroll_speed = speed def set_scroll_gap_width(self, gap_width: int): self.scroll_gap_width = gap_width self._regenerate_renderings() # Gap change requires cache rebuild