# Fit within bounds (preserves aspect ratio)
fitted = img.fit(800, 600)

# Fill exact dimensions (crops excess)
filled = img.fill(800, 600)

# Square thumbnail
avatar = img.thumb(200)

# High-quality resize
hq = img.resize(1920, 1080, method: :lanczos)

# Basic adjustments
brighter = img.brightness(30)      # -255 to 255
contrasted = img.contrast(1.5)     # 0.0 to 2.0
grayscale = img.grayscale
inverted = img.invert

# Effects
vintage = img.sepia
warm = img.temperature(30)         # positive = warmer
cool = img.temperature(-30)        # negative = cooler

# Blur
blurred = img.blur(radius: 3)
gaussian = img.blur_gaussian(radius: 5, sigma: 2.0)

# Sharpen
sharp = img.sharpen(amount: 1.5)

# Edge detection
edges = img.sobel
edges = img.prewitt
edges = img.detect_edges(threshold: 50)

img = CrImage.rgba(400, 400, CrImage::Color::WHITE)

# Shapes
img.draw_line(0, 0, 400, 400, color: CrImage::Color::RED)
img.draw_circle(200, 200, 50, color: CrImage::Color::BLUE, fill: true)
img.draw_rect(50, 50, 100, 80, stroke: CrImage::Color::BLACK)

# Thick anti-aliased lines
style = CrImage::Draw::LineStyle.new(CrImage::Color::RED, thickness: 5, anti_alias: true)
CrImage::Draw.line(img, CrImage::Point.new(50, 50), CrImage::Point.new(350, 350), style)

# Ring slice (for donut charts)
ring_style = CrImage::Draw::RingStyle.new(CrImage::Color::BLUE, fill: true)
CrImage::Draw.ring_slice(img, CrImage::Point.new(200, 200), 40, 80, 0.0, Math::PI, ring_style)

# Clipping regions
img.with_clip(50, 50, 200, 200) do |clipped|
  # Drawing here is restricted to the clip region
  clipped.draw_circle(100, 100, 150, color: CrImage::Color::GREEN, fill: true)
end

# Gradients
stops = [
  CrImage::Draw::ColorStop.new(0.0, CrImage::Color::RED),
  CrImage::Draw::ColorStop.new(1.0, CrImage::Color::BLUE)
]
gradient = CrImage::Draw::LinearGradient.new(
  CrImage::Point.new(0, 0),
  CrImage::Point.new(400, 0),
  stops
)
CrImage::Draw.fill_linear_gradient(img, img.bounds, gradient)

require "freetype"

font = FreeType::TrueType.load("path/to/font.ttf")
face = FreeType::TrueType.new_face(font, 48.0)

img = CrImage.rgba(400, 100, CrImage::Color::WHITE)
text_color = CrImage::Uniform.new(CrImage::Color::BLACK)
drawer = CrImage::Font::Drawer.new(img, text_color, face)

# Simple text
drawer.draw_text("Hello, World!", 20, 60)

# With effects
drawer.draw_text("Styled", 20, 60,
  shadow: true,
  outline: true,
  underline: true
)

# Easy text measurement
width = face.measure("Hello")
width, height = face.text_size("Hello")
line_height = face.line_height

frames = (0...10).map do |i|
  frame_img = CrImage.rgba(100, 100, CrImage::Color::WHITE)
  frame_img.draw_circle(10 + i * 8, 50, 10, color: CrImage::Color::RED, fill: true)
  CrImage::GIF::Frame.new(frame_img, delay: 10)  # 100ms per frame
end

animation = CrImage::GIF::Animation.new(frames, 100, 100, loop_count: 0)
CrImage::GIF.write_animation("animated.gif", animation)

# Simple
qr = CrImage.qr_code("https://example.com")
CrImage::PNG.write("qr.png", qr)

# With options
qr = CrImage.qr_code("Hello",
  size: 400,
  error_correction: :high,
  margin: 4
)

# Encode image to blurhash string
hash = img.to_blurhash  # => "LKO2?U%2Tw=w]~RBVZRi};RPxuwH"

# Decode to placeholder
placeholder = CrImage::Util::Blurhash.decode(hash, width: 32, height: 32)

original = CrImage.read("original.png")
modified = CrImage.read("modified.png")

mse = original.mse(modified)        # Mean Squared Error
psnr = original.psnr(modified)      # Peak Signal-to-Noise Ratio (dB)
ssim = original.ssim(modified)      # Structural Similarity (0-1)

# Visual diff for testing
diff = original.visual_diff(modified)
CrImage::PNG.write("diff.png", diff)