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