Class: Pixelflow::Canvas

Inherits:
Object
  • Object
show all
Defined in:
lib/pixelflow_canvas.rb

Defined Under Namespace

Classes: Event, MaskGenerator

Constant Summary collapse

COLOR_MODES = 
{
    :rgb => 0,
    :palette => 1,
}
ADVANCE_MODES = 
{
    :right => 0,
    :down => 1
}
DRAW_MODES = 
{
    :direct => 0,
    :buffered => 1
}
COMPOSE_MODES = 
{
    :copy => 0,
    :add => 1,
    :subtract => 2,
    :multiply => 3,
}
INTERPOLATION_MODES = 
{
    :nearest => 0,
    :bilinear => 1,
}

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(width, height, color_mode = nil, &block) ⇒ Canvas

Returns a new instance of Canvas.



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# File 'lib/pixelflow_canvas.rb', line 35

def initialize(width, height, color_mode = nil, &block)
    @width = 320
    @height = 180
    @x = 0
    @y = 0
    @r = color_mode == :palette ? 15 : 255
    @g = color_mode == :palette ? 0 : 255
    @b = color_mode == :palette ? 0 : 255
    @mask = nil
    @color_mode = :rgb
    @advance_mode = :right
    @draw_mode = :direct
    @compose_mode = :copy
    @palette = VGA_PALETTE.dup
    @socket = TCPSocket.new('127.0.0.1', 19223)


    # Fast transport: all drawing changes the local framebuffer.
    # Complete frames are sent instead of MOVE_TO/SET_PIXEL commands.
    @dirty = false
    @direct_frame_interval = 1.0 / 30.0
    @direct_pixel_counter = 0
    @last_present_timestamp =
        Process.clock_gettime(Process::CLOCK_MONOTONIC)
    set_size(width, height)
    set_color_mode(color_mode) if color_mode
    @last_timestamp = Process.clock_gettime(Process::CLOCK_MONOTONIC)
    at_exit do
        begin
            present if @dirty && @socket && !@socket.closed?
        rescue IOError, SystemCallError
            # VS Code may already have gone away during shutdown.
        end
    end

    if block_given?
        instance_eval(&block)
        present if @dirty
    end
end

Instance Attribute Details

#color_mode ⇒ Object (readonly)

Returns the value of attribute color_mode.



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# File 'lib/pixelflow_canvas.rb', line 80

def color_mode
  @color_mode
end

#height ⇒ Object (readonly)

Returns the value of attribute height.



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# File 'lib/pixelflow_canvas.rb', line 80

def height
  @height
end

#width ⇒ Object (readonly)

Returns the value of attribute width.



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# File 'lib/pixelflow_canvas.rb', line 80

def width
  @width
end

Class Method Details

.load_font(font) ⇒ Object

FONT RENDERING



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# File 'lib/pixelflow_canvas.rb', line 746

def self.load_font(font)
    @@cypher_fonts ||= {}
    return if @@cypher_fonts[font]
    # STDERR.puts "Loading font from #{path}..."
    font_data = {}
    File.open(File.join(File.dirname(__FILE__), 'pixelflow_canvas', 'fonts', "#{font}.bdf")) do |f|
        char = nil
        f.each_line do |line|
            if line[0, 9] == 'STARTCHAR'
                char = {}
            elsif line[0, 8] == 'ENCODING'
                char[:encoding] = line.sub('ENCODING ', '').strip.to_i
            elsif line[0, 7] == 'ENDCHAR'
                font_data[char[:encoding]] = char
                char = nil
            elsif line[0, 3] == 'BBX'
                parts = line.split(' ')
                char[:width] = parts[1].to_i
                char[:height] = parts[2].to_i
            elsif line[0, 6] == 'BITMAP'
                char[:bitmap] = []
            else
                if char && char[:bitmap]
                    char[:bitmap] << line.to_i(16)
                end
            end
        end
    end
    @@cypher_fonts[font] = font_data
end

Instance Method Details

#draw_arc(x, y, r, a0, a1, close_path = false) ⇒ Object 



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# File 'lib/pixelflow_canvas.rb', line 576

def draw_arc(x, y, r, a0, a1, close_path = false)
    # x = x.to_i
    # y = y.to_i
    # r = r.to_i
    a0 = a0.to_f
    a1 = a1.to_f
    a0 = a0 * Math::PI / 180.0
    a1 = a1 * Math::PI / 180.0
    da = 1.0 / r
    a = a0
    while a < a1
        x0 = x + r * Math.cos(a)
        y0 = y + r * Math.sin(a)
        a += da
        x1 = x + r * Math.cos(a)
        y1 = y + r * Math.sin(a)
        draw_line(x0, y0, x1, y1)
    end
    if close_path
        x0 = x + r * Math.cos(a0)
        y0 = y + r * Math.sin(a0)
        draw_line(x, y, x0, y0)
        x0 = x + r * Math.cos(a1)
        y0 = y + r * Math.sin(a1)
        draw_line(x, y, x0, y0)
    end
end

#draw_circle(x, y, r) ⇒ Object 



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# File 'lib/pixelflow_canvas.rb', line 429

def draw_circle(x, y, r)
    x = x.to_i
    y = y.to_i
    r = r.to_i
    f = 1 - r
    ddF_x = 1
    ddF_y = -2 * r
    xx = 0
    yy = r
    set_pixel(x, y + r)
    set_pixel(x, y - r)
    set_pixel(x + r, y)
    set_pixel(x - r, y)
    while xx < yy
        if f >= 0
            yy -= 1
            ddF_y += 2
            f += ddF_y
        end
        xx += 1
        ddF_x += 2
        f += ddF_x
        set_pixel(x + xx, y + yy)
        set_pixel(x - xx, y + yy)
        set_pixel(x + xx, y - yy)
        set_pixel(x - xx, y - yy)
        set_pixel(x + yy, y + xx)
        set_pixel(x - yy, y + xx)
        set_pixel(x + yy, y - xx)
        set_pixel(x - yy, y - xx)
    end
end

#draw_cubic_bezier(x0, y0, x1, y1, x2, y2, x3, y3, steps = 100) ⇒ Object 



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# File 'lib/pixelflow_canvas.rb', line 640

def draw_cubic_bezier(x0, y0, x1, y1, x2, y2, x3, y3, steps = 100)
    steps = steps.to_i
    xp = nil
    yp = nil
    (0..steps).each do |i|
        t = i.to_f / steps
        x = (1 - t) ** 3 * x0 + 3 * (1 - t) ** 2 * t * x1 + 3 * (1 - t) * t ** 2 * x2 + t ** 3 * x3
        y = (1 - t) ** 3 * y0 + 3 * (1 - t) ** 2 * t * y1 + 3 * (1 - t) * t ** 2 * y2 + t ** 3 * y3
        if xp && yp
            draw_line(xp.to_i, yp.to_i, x.to_i, y.to_i)
        end
        xp = x
        yp = y
    end
end

#draw_ellipse(x, y, ra, rb) ⇒ Object 



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# File 'lib/pixelflow_canvas.rb', line 494

def draw_ellipse(x, y, ra, rb)
    x = x.to_i
    y = y.to_i
    ra = ra.to_i
    rb = rb.to_i
    a2 = ra * ra
    b2 = rb * rb
    fa2 = 4 * a2
    fb2 = 4 * b2
    x0 = 0
    y0 = rb
    sigma = 2 * b2 + a2 * (1 - 2 * rb)
    while b2 * x0 <= a2 * y0
        set_pixel(x + x0, y + y0)
        set_pixel(x - x0, y + y0)
        set_pixel(x + x0, y - y0)
        set_pixel(x - x0, y - y0)
        if sigma >= 0
            sigma += fa2 * (1 - y0)
            y0 -= 1
        end
        sigma += b2 * ((4 * x0) + 6)
        x0 += 1
    end
    x0 = ra
    y0 = 0
    sigma = 2 * a2 + b2 * (1 - 2 * ra)
    while a2 * y0 <= b2 * x0
        set_pixel(x + x0, y + y0)
        set_pixel(x - x0, y + y0)
        set_pixel(x + x0, y - y0)
        set_pixel(x - x0, y - y0)
        if sigma >= 0
            sigma += fb2 * (1 - x0)
            x0 -= 1
        end
        sigma += a2 * ((4 * y0) + 6)
        y0 += 1
    end
end

#draw_line(x0, y0, x1, y1) ⇒ Object 



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# File 'lib/pixelflow_canvas.rb', line 404

def draw_line(x0, y0, x1, y1)
    x0 = x0.to_i
    y0 = y0.to_i
    x1 = x1.to_i
    y1 = y1.to_i
    dx = (x1 - x0).abs
    dy = (y1 - y0).abs
    sx = x0 < x1 ? 1 : -1
    sy = y0 < y1 ? 1 : -1
    err = dx - dy
    loop do
        set_pixel(x0, y0)
        break if x0 == x1 && y0 == y1
        e2 = 2 * err
        if e2 > -dy
            err -= dy
            x0 += sx
        end
        if e2 < dx
            err += dx
            y0 += sy
        end
    end
end

#draw_quadratic_bezier(x0, y0, x1, y1, x2, y2, steps = 100) ⇒ Object 



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# File 'lib/pixelflow_canvas.rb', line 624

def draw_quadratic_bezier(x0, y0, x1, y1, x2, y2, steps = 100)
    steps = steps.to_i
    xp = nil
    yp = nil
    (0..steps).each do |i|
        t = i.to_f / steps
        x = (1 - t) ** 2 * x0 + 2 * (1 - t) * t * x1 + t ** 2 * x2
        y = (1 - t) ** 2 * y0 + 2 * (1 - t) * t * y1 + t ** 2 * y2
        if xp && yp
            draw_line(xp.to_i, yp.to_i, x.to_i, y.to_i)
        end
        xp = x
        yp = y
    end
end

#draw_rect(x0, y0, x1, y1) ⇒ Object 



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# File 'lib/pixelflow_canvas.rb', line 375

def draw_rect(x0, y0, x1, y1)
    x0 = x0.to_i
    y0 = y0.to_i
    x1 = x1.to_i
    y1 = y1.to_i
    (x0..x1).each do |x|
        set_pixel(x, y0)
    end
    (x0..x1).each do |x|
        set_pixel(x, y1)
    end
    (y0+1..y1-1).each do |y|
        set_pixel(x0, y)
        set_pixel(x1, y)
    end
end

#draw_text(x, y, s, font, scale = 1) ⇒ Object 



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# File 'lib/pixelflow_canvas.rb', line 777

def draw_text(x, y, s, font, scale = 1)
    Canvas.load_font(font)
    dx = 0
    s.each_char do |c|
        glyph = @@cypher_fonts[font][c.ord]
        if glyph
            w = ((((glyph[:width] - 1) >> 3) + 1) << 3) - 1
            (0...glyph[:height]).each do |iy|
                (0...glyph[:width]).each do |ix|
                    if (((glyph[:bitmap][iy] >> (w - ix)) & 1) == 1)
                        (0...scale).each do |oy|
                            (0...scale).each do |ox|
                                set_pixel(x + (ix + dx) * scale + ox, y + iy * scale + oy)
                            end
                        end
                    end
                end
            end
            dx += glyph[:width]
        end
    end
end

#draw_triangle(x0, y0, x1, y1, x2, y2) ⇒ Object 



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# File 'lib/pixelflow_canvas.rb', line 656

def draw_triangle(x0, y0, x1, y1, x2, y2)
    draw_line(x0, y0, x1, y1)
    draw_line(x1, y1, x2, y2)
    draw_line(x2, y2, x0, y0)
end

#ensure_max_fps(fps) ⇒ Object 



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# File 'lib/pixelflow_canvas.rb', line 180

def ensure_max_fps(fps)
    # Existing examples call this once after drawing a frame.
    present if @draw_mode == :direct && @dirty

    frame_time = 1.0 / fps
    now = Process.clock_gettime(Process::CLOCK_MONOTONIC)
    if @last_timestamp
        remaining = frame_time - (now - @last_timestamp)
        sleep remaining if remaining > 0
    end
    @last_timestamp = Process.clock_gettime(Process::CLOCK_MONOTONIC)
end

#fetch_events(&block) ⇒ Object 



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# File 'lib/pixelflow_canvas.rb', line 828

def fetch_events(&block)
    @socket.write([9].pack('C'))
    @socket.flush
    json = ''
    loop do
        begin
            buffer = @socket.recv_nonblock(1024)
            json += buffer
        rescue IO::WaitReadable
            break
        end
    end
    return if json.empty?
    json.split("\r\n").each do |line|
        line.strip!
        next if line.empty?
        JSON.parse(line).each do |event|
            yield Event.new(event)
        end
    end
end

#fill_arc(x, y, r, a0, a1) ⇒ Object 



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# File 'lib/pixelflow_canvas.rb', line 604

def fill_arc(x, y, r, a0, a1)
    # x = x.to_i
    # y = y.to_i
    # r = r.to_i
    a0 = a0.to_f
    a1 = a1.to_f
    a0 = a0 * Math::PI / 180.0
    a1 = a1 * Math::PI / 180.0
    da = 1.0 / r
    a = a0
    while a < a1
        x0 = x + r * Math.cos(a)
        y0 = y + r * Math.sin(a)
        a += da
        x1 = x + r * Math.cos(a)
        y1 = y + r * Math.sin(a)
        fill_triangle(x, y, x0, y0, x1, y1)
    end
end

#fill_circle(x, y, r) ⇒ Object 



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# File 'lib/pixelflow_canvas.rb', line 462

def fill_circle(x, y, r)
    x = x.to_i
    y = y.to_i
    r = r.to_i
    f = 1 - r
    ddF_x = 1
    ddF_y = -2 * r
    xx = 0
    yy = r
    (y - r..y + r).each do |i|
        set_pixel(x, i)
    end
    while xx < yy
        if f >= 0
            yy -= 1
            ddF_y += 2
            f += ddF_y
        end
        xx += 1
        ddF_x += 2
        f += ddF_x
        (y - yy..y + yy).each do |i|
            set_pixel(x + xx, i)
            set_pixel(x - xx, i)
        end
        (y - xx..y + xx).each do |i|
            set_pixel(x + yy, i)
            set_pixel(x - yy, i)
        end
    end
end

#fill_ellipse(x, y, ra, rb) ⇒ Object 



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# File 'lib/pixelflow_canvas.rb', line 535

def fill_ellipse(x, y, ra, rb)
    x = x.to_i
    y = y.to_i
    ra = ra.to_i
    rb = rb.to_i
    a2 = ra * ra
    b2 = rb * rb
    fa2 = 4 * a2
    fb2 = 4 * b2
    x0 = 0
    y0 = rb
    sigma = 2 * b2 + a2 * (1 - 2 * rb)
    while b2 * x0 <= a2 * y0
        (x - x0..x + x0).each do |i|
            set_pixel(i, y + y0)
            set_pixel(i, y - y0)
        end
        if sigma >= 0
            sigma += fa2 * (1 - y0)
            y0 -= 1
        end
        sigma += b2 * ((4 * x0) + 6)
        x0 += 1
    end
    x0 = ra
    y0 = 0
    sigma = 2 * a2 + b2 * (1 - 2 * ra)
    while a2 * y0 <= b2 * x0
        (x - x0..x + x0).each do |i|
            set_pixel(i, y + y0)
            set_pixel(i, y - y0)
        end
        if sigma >= 0
            sigma += fb2 * (1 - x0)
            x0 -= 1
        end
        sigma += a2 * ((4 * y0) + 6)
        y0 += 1
    end
end

#fill_rect(x0, y0, x1, y1) ⇒ Object 



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# File 'lib/pixelflow_canvas.rb', line 392

def fill_rect(x0, y0, x1, y1)
    x0 = x0.to_i
    y0 = y0.to_i
    x1 = x1.to_i
    y1 = y1.to_i
    (y0..y1).each do |y|
        (x0..x1).each do |x|
            set_pixel(x, y)
        end
    end
end

#fill_triangle(x0, y0, x1, y1, x2, y2) ⇒ Object 



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# File 'lib/pixelflow_canvas.rb', line 662

def fill_triangle(x0, y0, x1, y1, x2, y2)
    x0 = x0.to_i
    y0 = y0.to_i
    x1 = x1.to_i
    y1 = y1.to_i
    x2 = x2.to_i
    y2 = y2.to_i
    if y0 > y1
        x0, x1 = x1, x0
        y0, y1 = y1, y0
    end
    if y1 > y2
        x1, x2 = x2, x1
        y1, y2 = y2, y1
    end
    if y0 > y1
        x0, x1 = x1, x0
        y0, y1 = y1, y0
    end
    total_height = y2 - y0
    (0...total_height).each do |i|
        second_half = i > y1 - y0 || y1 == y0
        segment_height = second_half ? y2 - y1 : y1 - y0
        alpha = i.to_f / total_height
        beta = (i - (second_half ? y1 - y0 : 0)).to_f / segment_height
        ax = x0 + (x2 - x0) * alpha
        ay = y0 + (y2 - y0) * alpha
        bx = second_half ? x1 + (x2 - x1) * beta : x0 + (x1 - x0) * beta
        by = second_half ? y1 + (y2 - y1) * beta : y0 + (y1 - y0) * beta
        if ax > bx
            ax, bx = bx, ax
            ay, by = by, ay
        end
        (ax.to_i..bx.to_i).each do |j|
            set_pixel(j, y0 + i)
        end
    end
end

#flip ⇒ Object 



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# File 'lib/pixelflow_canvas.rb', line 147

def flip()
    present
end

#flood_fill(x, y, r = nil, g = nil, b = nil) ⇒ Object 



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# File 'lib/pixelflow_canvas.rb', line 701

def flood_fill(x, y, r = nil, g = nil, b = nil)
    x = x.to_i
    y = y.to_i
    r ||= @r
    g ||= @g
    b ||= @b
    return if x < 0 || x >= @width || y < 0 || y >= @height
    sr = 0
    sg = 0
    sb = 0
    if @color_mode == :rgb
        sr = @screen[(y * @width + x) * 3 + 0]
        sg = @screen[(y * @width + x) * 3 + 1]
        sb = @screen[(y * @width + x) * 3 + 2]
    else
        sr = @screen[y * @width + x]
    end
    stack = [[x, y]]
    while stack.any?
        x, y = stack.pop
        next if x < 0 || x >= @width || y < 0 || y >= @height
        if @color_mode == :rgb
            offset = (y * @width + x) * 3
            if @screen[offset + 0] == sr && @screen[offset + 1] == sg && @screen[offset + 2] == sb
                set_pixel(x, y)
                stack.push([x - 1, y])
                stack.push([x + 1, y])
                stack.push([x, y - 1])
                stack.push([x, y + 1])
            end
        else
            offset = y * @width + x
            if @screen[offset] == sr
                set_pixel(x, y)
                stack.push([x - 1, y])
                stack.push([x + 1, y])
                stack.push([x, y - 1])
                stack.push([x, y + 1])
            end
        end
    end
end

#get_pixel(x, y) ⇒ Object 



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# File 'lib/pixelflow_canvas.rb', line 364

def get_pixel(x, y)
    x = x.to_i
    y = y.to_i
    return 0 if x < 0 || x >= @width || y < 0 || y >= @height
    if @color_mode == :rgb
        return @screen[(y * @width + x) * 3, 3]
    else
        return @screen[y * @width + x]
    end
end

#inspect ⇒ Object 



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# File 'lib/pixelflow_canvas.rb', line 76

def inspect
    "#<Pixelflow::Canvas @ #{@width}x#{@height}>"
end

#move_to(x, y) ⇒ Object 



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# File 'lib/pixelflow_canvas.rb', line 297

def move_to(x, y)
    x = x.to_i
    y = y.to_i
    return if x < 0 || x >= @width || y < 0 || y >= @height

    @x = x
    @y = y
end

#present ⇒ Object

Send one complete framebuffer as one SET_BUFFER packet.



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# File 'lib/pixelflow_canvas.rb', line 152

def present
    return unless @dirty

    packet = "\x07".b
    packet << @screen.pack('C*')
    @socket.write(packet)
    @socket.flush

    @dirty = false
    @direct_pixel_counter = 0
    @last_present_timestamp =
        Process.clock_gettime(Process::CLOCK_MONOTONIC)
end

#present_if_due ⇒ Object

Direct mode remains progressive without checking the clock for every single pixel. We only test the 30 fps deadline every 1024 pixel writes. Existing animation code gets an exact frame boundary through ensure_max_fps below.



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# File 'lib/pixelflow_canvas.rb', line 170

def present_if_due
    return unless @draw_mode == :direct && @dirty

    @direct_pixel_counter += 1
    return unless (@direct_pixel_counter & 1023).zero?

    now = Process.clock_gettime(Process::CLOCK_MONOTONIC)
    present if now - @last_present_timestamp >= @direct_frame_interval
end

#recreate_screen ⇒ Object 



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# File 'lib/pixelflow_canvas.rb', line 96

def recreate_screen()
    @screen = [0] * @width * @height * (@color_mode == :rgb ? 3 : 1)
end

#remove_mask ⇒ Object 



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# File 'lib/pixelflow_canvas.rb', line 248

def remove_mask()
    @mask = nil
end

#run(&block) ⇒ Object 



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# File 'lib/pixelflow_canvas.rb', line 82

def run(&block)
    instance_eval(&block)
end

#save_as_png(path) ⇒ Object 



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# File 'lib/pixelflow_canvas.rb', line 193

def save_as_png(path)
    if @color_mode == :rgb
        image = ChunkyPNG::Image.from_rgb_stream(@width, @height, @screen.pack('C*'))
        image.save(path)
    else
        buffer = [0] * @width * @height * 3
        offset = 0
        source = 0
        (0...@height).each do |y|
            (0...@width).each do |x|
                i = @screen[source]
                buffer[offset + 0] = @palette[i * 3+ 0]
                buffer[offset + 1] = @palette[i * 3 + 1]
                buffer[offset + 2] = @palette[i * 3 + 2]
                source += 1
                offset += 3
            end
        end
        image = ChunkyPNG::Image.from_rgb_stream(@width, @height, buffer.pack('C*'))
        image.save(path)
    end
end

#set_advance_mode(mode) ⇒ Object 



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# File 'lib/pixelflow_canvas.rb', line 113

def set_advance_mode(mode)
    unless ADVANCE_MODES.keys.include?(mode)
        raise "Invalid advance mode: #{mode}"
    end
    @advance_mode = mode
    @socket.write([4, ADVANCE_MODES[@advance_mode]].pack('CC'))
    @socket.flush
end

#set_color(r, g = 0, b = 0) ⇒ Object 



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# File 'lib/pixelflow_canvas.rb', line 252

def set_color(r, g = 0, b = 0)
    r = r.to_i.clamp(0, 255)
    g = g.to_i.clamp(0, 255)
    b = b.to_i.clamp(0, 255)
    @r = r
    @g = g
    @b = b
end

#set_color_mode(mode) ⇒ Object 



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# File 'lib/pixelflow_canvas.rb', line 100

def set_color_mode(mode)
    unless COLOR_MODES.keys.include?(mode)
        raise "Invalid color mode: #{mode}"
    end
    @color_mode = mode
    if mode == :palette
        @palette = VGA_PALETTE.dup
    end
    recreate_screen()
    @socket.write([2, COLOR_MODES[@color_mode]].pack('CC'))
    @socket.flush
end

#set_compose_mode(mode) ⇒ Object 



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# File 'lib/pixelflow_canvas.rb', line 129

def set_compose_mode(mode)
    unless COMPOSE_MODES.keys.include?(mode)
        raise "Invalid compose mode: #{mode}"
    end
    if mode != :copy && @color_mode != :rgb
        raise "Cannot switch compose mode to #{mode} in palette color mode!"
    end
    @compose_mode = mode
end

#set_draw_mode(mode) ⇒ Object 



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# File 'lib/pixelflow_canvas.rb', line 122

def set_draw_mode(mode)
    unless DRAW_MODES.keys.include?(mode)
        raise "Invalid draw mode: #{mode}"
    end
    @draw_mode = mode
end

#set_interpolation_mode(mode) ⇒ Object 



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# File 'lib/pixelflow_canvas.rb', line 139

def set_interpolation_mode(mode)
    unless INTERPOLATION_MODES.keys.include?(mode)
        raise "Invalid interpolation mode: #{mode}"
    end
    @socket.write([8, INTERPOLATION_MODES[mode]].pack('CC'))
    @socket.flush
end

#set_mask(&block) ⇒ Object 



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# File 'lib/pixelflow_canvas.rb', line 243

def set_mask(&block)
    @mask = MaskGenerator.new(self)
    @mask.instance_eval(&block)
end

#set_palette(i, r, g, b) ⇒ Object 



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# File 'lib/pixelflow_canvas.rb', line 261

def set_palette(i, r, g, b)
    i = i.to_i.clamp(0, 255)
    r = r.to_i.clamp(0, 255)
    g = g.to_i.clamp(0, 255)
    b = b.to_i.clamp(0, 255)
    @palette[i * 3 + 0] = r
    @palette[i * 3 + 1] = g
    @palette[i * 3 + 2] = b
    @socket.write([3, i, r, g, b].pack('CCCCC'))
    @socket.flush
end

#set_pixel(x, y, r = nil, g = nil, b = nil) ⇒ Object 



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# File 'lib/pixelflow_canvas.rb', line 306

def set_pixel(x, y, r = nil, g = nil, b = nil)
    r ||= @r
    g ||= @g
    b ||= @b
    x = x.to_i
    y = y.to_i
    return if x < 0 || x >= @width || y < 0 || y >= @height
    unless x == @x && y == @y
        move_to(x, y)
    end
    if @mask
        return unless @mask.mask[y * @width + x]
    end
    if @color_mode == :rgb
        offset = (@y * @width + @x) * 3
        if @compose_mode == :add
            r += @screen[offset + 0]
            g += @screen[offset + 1]
            b += @screen[offset + 2]
            r = 255 if r > 255
            g = 255 if g > 255
            b = 255 if b > 255
        elsif @compose_mode == :subtract
            r = @screen[offset + 0] - r
            g = @screen[offset + 1] - g
            b = @screen[offset + 2] - b
            r = 0 if r < 0
            g = 0 if g < 0
            b = 0 if b < 0
        elsif @compose_mode == :multiply
            r = (@screen[offset + 0] * r) / 255
            g = (@screen[offset + 1] * g) / 255
            b = (@screen[offset + 2] * b) / 255
        end
        @screen[offset + 0] = r
        @screen[offset + 1] = g
        @screen[offset + 2] = b
    else
        offset = @y * @width + @x
        @screen[offset] = r
    end
    @dirty = true
    present_if_due
    if @advance_mode == :right
        @x += 1
        if @x >= @width
            @x = 0
            @y = (@y + 1) % @height
        end
    else
        @y += 1
        if @y >= @height
            @y = 0
            @x = (@x + 1) % @width
        end
    end
end

#set_predefined_palette(key) ⇒ Object 



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# File 'lib/pixelflow_canvas.rb', line 273

def set_predefined_palette(key)
    if key == :vga
        @palette = VGA_PALETTE.dup
        (0..255).each do |i|
            @socket.write([3, i, @palette[i * 3 + 0], @palette[i * 3 + 1], @palette[i * 3 + 2]].pack('CCCCC'))
        end
        @socket.flush
    else
        @@palettes ||= YAML.load(File.read(File.join(File.dirname(__FILE__), 'pixelflow_canvas', 'palettes.yaml')))
        if @@palettes[key]
            @palette = [0] * 768
            @@palettes[key].each_with_index do |color, i|
                @palette[i * 3 + 0] = color[1, 2].to_i(16)
                @palette[i * 3 + 1] = color[3, 2].to_i(16)
                @palette[i * 3 + 2] = color[5, 2].to_i(16)
                @socket.write([3, i, @palette[i * 3 + 0], @palette[i * 3 + 1], @palette[i * 3 + 2]].pack('CCCCC'))
            end
            @socket.flush
        else
            raise "Invalid predefined palette: #{key}"
        end
    end
end

#set_size(width, height) ⇒ Object 



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# File 'lib/pixelflow_canvas.rb', line 86

def set_size(width, height)
    @x = 0
    @y = 0
    @width = width
    @height = height
    recreate_screen()
    @socket.write([1, width, height].pack('Cnn'))
    @socket.flush
end

#text_width(s, font, scale = 1) ⇒ Object 



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# File 'lib/pixelflow_canvas.rb', line 800

def text_width(s, font, scale = 1)
    Canvas.load_font(font)
    width = 0
    s.each_char do |c|
        glyph = @@cypher_fonts[font][c.ord]
        if glyph
            width += glyph[:width] * scale
        end
    end
    width
end