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)
    set_size(width, height)
    set_color_mode(color_mode) if color_mode
    @last_timestamp = Time.now.to_f
    if block_given?
        instance_eval(&block)
    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 62

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 62

def height
  @height
end

#width ⇒ Object (readonly)

Returns the value of attribute width.



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# File 'lib/pixelflow_canvas.rb', line 62

def width
  @width
end

Class Method Details

.load_font(font) ⇒ Object

FONT RENDERING



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# File 'lib/pixelflow_canvas.rb', line 712

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 542

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 395

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 606

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 460

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 370

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 590

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 341

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 743

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 622

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 137

def ensure_max_fps(fps)
    fps1 = 1.0 / fps
    t = Time.now.to_f
    if @last_timestamp
        loop do
            sleep 0.01
            break if (Time.now.to_f - @last_timestamp) >= fps1
        end
    end
    @last_timestamp = Time.now.to_f
end

#fetch_events(&block) ⇒ Object 



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# File 'lib/pixelflow_canvas.rb', line 794

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 570

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 428

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 501

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 358

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 628

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 129

def flip()
    if @draw_mode == :buffered
        @socket.write([7].pack('C'))
        @socket.write(@screen.pack('C*'))
        @socket.flush
    end
end

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



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# File 'lib/pixelflow_canvas.rb', line 667

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 330

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 58

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

#move_to(x, y) ⇒ Object 



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# File 'lib/pixelflow_canvas.rb', line 253

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
    buffer = [5].pack('C')
    buffer += [x].pack((@width <= 256) ? 'C' : 'n')
    buffer += [y].pack((@height <= 256) ? 'C' : 'n')
    @socket.write(buffer)
    @socket.flush
end

#recreate_screen ⇒ Object 



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# File 'lib/pixelflow_canvas.rb', line 78

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 204

def remove_mask()
    @mask = nil
end

#run(&block) ⇒ Object 



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# File 'lib/pixelflow_canvas.rb', line 64

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

#save_as_png(path) ⇒ Object 



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# File 'lib/pixelflow_canvas.rb', line 149

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 95

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 208

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 82

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 111

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 104

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 121

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 199

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 217

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 266

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
    if @draw_mode == :direct
        if @color_mode == :rgb
            @socket.write([6, r, g, b].pack('CCCC'))
        else
            @socket.write([6, r].pack('CC'))
        end
        @socket.flush()
    end
    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 229

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 68

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 766

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