dreader-application/examples/test_hardware_display.py

#!/usr/bin/env python3
"""
Simple test to verify the hardware HAL can display images.
Creates a test pattern and displays it on the e-ink screen.
"""

import sys
import asyncio
from pathlib import Path
from PIL import Image, ImageDraw, ImageFont

# Add parent directory to path
sys.path.insert(0, str(Path(__file__).parent.parent))

from dreader.hal_hardware import HardwareDisplayHAL


def create_test_image(width=1404, height=1872 ):
    """Create a test pattern image."""
    print("Creating test image...")

    # Create white background
    img = Image.new('RGBA', (width, height), color='white')
    draw = ImageDraw.Draw(img)

    # Draw border
    border_width = 10
    draw.rectangle(
        [(border_width, border_width),
         (width - border_width, height - border_width)],
        outline='black',
        width=border_width
    )

    # Draw title
    try:
        font_large = ImageFont.truetype("/usr/share/fonts/truetype/dejavu/DejaVuSans-Bold.ttf", 80)
        font_medium = ImageFont.truetype("/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf", 50)
    except:
        font_large = ImageFont.load_default()
        font_medium = ImageFont.load_default()

    # Center text
    title = "Hardware Display Test"
    title_bbox = draw.textbbox((0, 0), title, font=font_large)
    title_width = title_bbox[2] - title_bbox[0]
    title_x = (width - title_width) // 2
    draw.text((title_x, 100), title, fill='black', font=font_large)

    # Instructions
    instructions = [
        "If you can see this, the display is working!",
        "",
        "Test pattern includes:",
        "• Border around the screen",
        "• Centered text",
        "• Diagonal lines",
        "• Corner markers"
    ]

    y = 250
    for line in instructions:
        if line:
            bbox = draw.textbbox((0, 0), line, font=font_medium)
            line_width = bbox[2] - bbox[0]
            x = (width - line_width) // 2
            draw.text((x, y), line, fill='black', font=font_medium)
        y += 70

    # Draw diagonal lines
    draw.line([(50, 50), (width-50, height-50)], fill='black', width=3)
    draw.line([(width-50, 50), (50, height-50)], fill='black', width=3)

    # Draw corner markers
    marker_size = 100
    # Top-left
    draw.rectangle([(20, 20), (20 + marker_size, 20 + marker_size)],
                   fill='black')
    draw.text((30, 30), "TL", fill='white', font=font_medium)

    # Top-right
    draw.rectangle([(width - 20 - marker_size, 20),
                    (width - 20, 20 + marker_size)],
                   fill='black')
    draw.text((width - 100, 30), "TR", fill='white', font=font_medium)

    # Bottom-left
    draw.rectangle([(20, height - 20 - marker_size),
                    (20 + marker_size, height - 20)],
                   fill='black')
    draw.text((30, height - 100), "BL", fill='white', font=font_medium)

    # Bottom-right
    draw.rectangle([(width - 20 - marker_size, height - 20 - marker_size),
                    (width - 20, height - 20)],
                   fill='black')
    draw.text((width - 100, height - 100), "BR", fill='white', font=font_medium)

    print(f"Test image created: {width}x{height} RGBA")
    return img


async def main(args):
    """Test hardware display."""

    print("=" * 60)
    print("Hardware Display Test")
    print("=" * 60)
    print()

    # Get VCOM from args
    vcom = args.vcom if hasattr(args, 'vcom') else -1.65
    print(f"Using VCOM: {vcom}V")
    print()

    # Create test image
    test_image = create_test_image(1872, 1404)

    # Save test image for reference
    output_file = "test_pattern.png"
    test_image.save(output_file)
    print(f"Test pattern saved to: {output_file}")
    print()

    # Initialize hardware HAL
    print("Initializing hardware HAL...")
    hal = HardwareDisplayHAL(
        width=1872,
        height=1404,
        vcom=vcom,
        config_file="hardware_config.json"
    )

    print("Initializing hardware components...")
    await hal.initialize()
    print("✓ Hardware initialized")
    print()

    # Display the test image
    print("Displaying test image on e-ink screen...")
    print("(This may take a few seconds for the full refresh)")
    print(f"Converting image from {test_image.mode} to grayscale for e-ink...")

    # Convert RGBA to grayscale (L mode) for e-ink display
    if test_image.mode == 'RGBA':
        # Convert RGBA to RGB first (flatten alpha)
        rgb_image = Image.new('RGB', test_image.size, (255, 255, 255))
        rgb_image.paste(test_image, mask=test_image.split()[3])  # Use alpha as mask
        test_image_gray = rgb_image.convert('L')
    else:
        test_image_gray = test_image.convert('L')

    print(f"Image converted to {test_image_gray.mode} mode")
    await hal.show_image(test_image_gray)
    print("✓ Image displayed!")
    print()

    print("=" * 60)
    print("SUCCESS!")
    print("=" * 60)
    print()
    print("If you can see the test pattern on the screen, the")
    print("hardware display is working correctly!")
    print()
    print("Check that you can see:")
    print("  • Black border around the edges")
    print("  • Title text centered at the top")
    print("  • Diagonal lines crossing the screen")
    print("  • Corner markers labeled TL, TR, BL, BR")
    print()
    print("Press Ctrl+C to exit")
    print()

    # Keep running so user can see the image
    try:
        while True:
            await asyncio.sleep(1)
    except KeyboardInterrupt:
        print("\nCleaning up...")
        await hal.cleanup()
        print("Done!")


if __name__ == "__main__":
    import argparse

    parser = argparse.ArgumentParser(description='Test hardware display')
    parser.add_argument('--vcom', type=float, default=-1.65,
                       help='VCOM voltage (check your display label, default: -1.65)')

    args = parser.parse_args()

    try:
        asyncio.run(main(args))
    except KeyboardInterrupt:
        print("\nTest interrupted")
    except Exception as e:
        print(f"\nERROR: {e}")
        import traceback
        traceback.print_exc()
        sys.exit(1)