Class: Hokusai::Backends::SDLBackend

Inherits:
Object
  • Object
show all
Defined in:
ui/src/hokusai/backends/sdl2.rb,
ui/src/hokusai/backends/sdl2/font.rb,
ui/src/hokusai/backends/sdl2/keys.rb,
ui/src/hokusai/backends/sdl2/color.rb,
ui/src/hokusai/backends/sdl2/config.rb

Defined Under Namespace

Classes: Config, Font

Constant Summary collapse

SDL_PATH = 
ENV["SDL_PATH"] || "#{__dir__}/../../../../vendor/lib"
OnWidthCb = 
Proc.new do |char, raw|
  minxp = FFI::MemoryPointer.new :int
  maxxp = FFI::MemoryPointer.new :int
  minyp = FFI::MemoryPointer.new :int
  maxyp = FFI::MemoryPointer.new :int
  advancep = FFI::MemoryPointer.new :int

  SDL.TTF_GlyphMetrics32(raw, char.ord, minxp, maxxp, minyp, maxyp, advancep)

  metrics = [minxp.read_int, maxxp.read_int, minyp.read_int, maxyp.read_int, advancep.read_int]

  minxp.free
  maxxp.free
  minyp.free
  maxyp.free
  advancep.free

  metrics[4].to_f
end
Keys = 
[
[:null, SDL::SDLK_UNKNOWN],
# [:left_super, SDL::SDLK_LSUPER],
# [:right_super, SDL::SDLK_RSUPER],
[:apostrophe, SDL::SDLK_QUOTE],
[:comma, SDL::SDLK_COMMA],
[:minus, SDL::SDLK_MINUS],
[:period, SDL::SDLK_PERIOD],
[:slash, SDL::SDLK_SLASH],
[:zero, SDL::SDLK_0],
[:one, SDL::SDLK_1],
[:two, SDL::SDLK_2],
[:three, SDL::SDLK_3],
[:four, SDL::SDLK_4],
[:five, SDL::SDLK_5],
[:six, SDL::SDLK_6],
[:seven, SDL::SDLK_7],
[:eight, SDL::SDLK_8],
[:nine, SDL::SDLK_9],
[:semicolon, SDL::SDLK_SEMICOLON],
[:equal, SDL::SDLK_EQUALS],
[:a, SDL::SDLK_a],
[:b, SDL::SDLK_b],
[:c, SDL::SDLK_c],
[:d, SDL::SDLK_d],
[:e, SDL::SDLK_e],
[:f, SDL::SDLK_f],
[:g, SDL::SDLK_g],
[:h, SDL::SDLK_h],
[:i, SDL::SDLK_i],
[:j, SDL::SDLK_j],
[:k, SDL::SDLK_k],
[:l, SDL::SDLK_l],
[:m, SDL::SDLK_m],
[:n, SDL::SDLK_n],
[:o, SDL::SDLK_o],
[:p, SDL::SDLK_p],
[:q, SDL::SDLK_q],
[:r, SDL::SDLK_r],
[:s, SDL::SDLK_s],
[:t, SDL::SDLK_t],
[:u, SDL::SDLK_u],
[:v, SDL::SDLK_v],
[:w, SDL::SDLK_w],
[:x, SDL::SDLK_x],
[:y, SDL::SDLK_y],
[:z, SDL::SDLK_z],
[:left_bracket, SDL::SDLK_LEFTBRACKET],
[:backslash, SDL::SDLK_BACKSLASH],
[:right_bracket, SDL::SDLK_RIGHTBRACKET],
[:grave, SDL::SDLK_BACKQUOTE],
[:space, SDL::SDLK_SPACE],
[:escape, SDL::SDLK_ESCAPE],
[:enter, SDL::SDLK_RETURN],
[:tab, SDL::SDLK_TAB],
[:backspace, SDL::SDLK_BACKSPACE],
[:insert, SDL::SDLK_INSERT],
[:delete, SDL::SDLK_DELETE],
[:right, SDL::SDLK_RIGHT],
[:left, SDL::SDLK_LEFT],
[:down, SDL::SDLK_DOWN],
[:up, SDL::SDLK_UP],
[:page_up, SDL::SDLK_PAGEUP],
[:page_down, SDL::SDLK_PAGEDOWN],
[:home, SDL::SDLK_HOME],
[:end, SDL::SDLK_END],
[:caps_lock, SDL::SDLK_CAPSLOCK],
[:scroll_lock, SDL::SDLK_SCROLLLOCK],
[:num_lock, SDL::SDLK_NUMLOCKCLEAR],
[:print_screen, SDL::SDLK_PRINTSCREEN],
[:pause, SDL::SDLK_PAUSE],
[:f1, SDL::SDLK_F1],
[:f2, SDL::SDLK_F2],
[:f3, SDL::SDLK_F3],
[:f4, SDL::SDLK_F4],
[:f5, SDL::SDLK_F5],
[:f6, SDL::SDLK_F6],
[:f7, SDL::SDLK_F7],
[:f8, SDL::SDLK_F8],
[:f9, SDL::SDLK_F9],
[:f10, SDL::SDLK_F10],
[:f11, SDL::SDLK_F11],
[:f12, SDL::SDLK_F12],
[:kb_menu, SDL::SDLK_MENU],
[:kp_0, SDL::SDLK_KP_0],
[:kp_1, SDL::SDLK_KP_1],
[:kp_2, SDL::SDLK_KP_2],
[:kp_3, SDL::SDLK_KP_3],
[:kp_4, SDL::SDLK_KP_4],
[:kp_5, SDL::SDLK_KP_5],
[:kp_6, SDL::SDLK_KP_6],
[:kp_7, SDL::SDLK_KP_7],
[:kp_8, SDL::SDLK_KP_8],
[:kp_9, SDL::SDLK_KP_9],
[:kp_decimal, SDL::SDLK_KP_DECIMAL],
[:kp_divide, SDL::SDLK_KP_DIVIDE],
[:kp_multiply, SDL::SDLK_KP_MULTIPLY],
[:kp_subtract, SDL::SDLK_KP_MINUS],
[:kp_add, SDL::SDLK_KP_PLUS],
[:kp_enter, SDL::SDLK_KP_ENTER],
[:kp_equal, SDL::SDLK_KP_EQUALS],
[:back, SDL::SDLK_AC_BACK],
[:menu, SDL::SDLK_MENU],
[:volume_up, SDL::SDLK_VOLUMEUP],
[:volume_down, SDL::SDLK_VOLUMEDOWN]].to_h {|(k,v)| [v, k]}
Modifiers = 
[
  [SDL::KMOD_LSHIFT, :left_shift],
  [SDL::KMOD_RSHIFT, :right_shift],
  [SDL::KMOD_RALT, :right_alt],
  [SDL::KMOD_RCTRL, :right_control],
  [SDL::KMOD_LALT, :left_alt],
  [SDL::KMOD_LCTRL, :left_control],
]

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize {|@config| ... } ⇒ SDLBackend

Returns a new instance of SDLBackend.

Yields:



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# File 'ui/src/hokusai/backends/sdl2.rb', line 53

def initialize
  @config = Config.new

  yield @config
end

Instance Attribute Details

#config ⇒ Object (readonly)

Returns the value of attribute config.



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# File 'ui/src/hokusai/backends/sdl2.rb', line 9

def config
  @config
end

#render_height ⇒ Object

Returns the value of attribute render_height.



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# File 'ui/src/hokusai/backends/sdl2.rb', line 10

def render_height
  @render_height
end

#render_width ⇒ Object

Returns the value of attribute render_width.



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# File 'ui/src/hokusai/backends/sdl2.rb', line 10

def render_width
  @render_width
end

Class Method Details

.color(r, g, b, a = 255) ⇒ Object 



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# File 'ui/src/hokusai/backends/sdl2/color.rb', line 3

def self.color(r, g, b, a = 255)
  color = SDL::Color.new
  color[:r] = r
  color[:g] = g
  color[:b] = b
  color[:a] = a
  color
end

.cursors ⇒ Object 



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# File 'ui/src/hokusai/backends/sdl2.rb', line 23

def self.cursors
  @cursors ||= {
   default: SDL.CreateSystemCursor(SDL::SYSTEM_CURSOR_ARROW),
   arrow: SDL.CreateSystemCursor(SDL::SYSTEM_CURSOR_ARROW),
   ibeam: SDL.CreateSystemCursor(SDL::SYSTEM_CURSOR_IBEAM),
   crosshair: SDL.CreateSystemCursor(SDL::SYSTEM_CURSOR_CROSSHAIR),
   pointer: SDL.CreateSystemCursor(SDL::SYSTEM_CURSOR_HAND)
 }
end

.font_textures ⇒ Object 



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# File 'ui/src/hokusai/backends/sdl2.rb', line 49

def self.font_textures
  @font_textures ||= {}
end

.fonts ⇒ Object 



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# File 'ui/src/hokusai/backends/sdl2.rb', line 45

def self.fonts
  @fonts ||= {}
end

.images ⇒ Object 



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# File 'ui/src/hokusai/backends/sdl2.rb', line 41

def self.images
  @images ||= {}
end

.run(app) ⇒ Object 



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# File 'ui/src/hokusai/backends/sdl2.rb', line 14

def self.run(app)
  backend = new do |config|
    yield(config)
  end

  block = app.mount
  backend.run(block)
end

.stopped ⇒ Object 



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# File 'ui/src/hokusai/backends/sdl2.rb', line 33

def self.stopped
  @stopped ||= false
end

.stopped=(val) ⇒ Object 



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# File 'ui/src/hokusai/backends/sdl2.rb', line 37

def self.stopped=(val)
  @stopped = val
end

Instance Method Details

#inside_scissor(x, y, h = 0) ⇒ Object 



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# File 'ui/src/hokusai/backends/sdl2.rb', line 303

def inside_scissor(x, y, h = 0)
  return true if @scissor.nil?

  val = y + h >= @scissor[1] && y <= @scissor[1] + @scissor[3]
  # pp ["inside scissor", val, [x,y], @scissor]
  val
end

#mouse_button(clicked: false, down: false, released: false, up: false) ⇒ Object 



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# File 'ui/src/hokusai/backends/sdl2.rb', line 136

def mouse_button(clicked: false, down: false, released: false, up: false)
  if @mouse_button.nil?
    @mouse_button = LibHokusai::HmlInputMouseButton.create(clicked: clicked, down: down, released: released, up: up)
  else
    @mouse_button[:clicked] = clicked
    @mouse_button[:down] = down
    @mouse_button[:released] = released
    @mouse_button[:up] = up
  end

  @mouse_button
end

#nine_slice(x, y, w, h, rounding) ⇒ Object 



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# File 'ui/src/hokusai/backends/sdl2.rb', line 280

def nine_slice(x, y, w, h, rounding)
  tx = x + rounding
  ty = y
  tw = w - (rounding * 2)
  th = rounding

  mx = x + rounding
  my = y + rounding
  mw = w - (rounding * 2)
  mh = h - (rounding * 2)

  bx = x + rounding
  by = h - rounding
  bw = w - (rounding * 2)
  bh = rounding

  {
    top_center: [tx, ty, tw, th],
    middle_center: [mx, my, mw, mh],
    bottom_center: [bx, by, bw, bh]
  }
end

#process_input(input, event) ⇒ Object 



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# File 'ui/src/hokusai/backends/sdl2.rb', line 172

def process_input(input, event)
  reset_keys(input)

  case event[:common][:type]
  when SDL::KEYDOWN
    modifier = event[:key][:keysym][:mod]
    code = event[:key][:keysym][:sym]
    hkey = Keys[code]

    LibHokusai.hoku_input_keyboard_start(input.raw)
    Modifiers.each do |(sdlk, hkey)|
      if modifier & sdlk == sdlk
        LibHokusai.hoku_input_keyboard_set_key(input.raw, hkey, true)
      end
    end

    LibHokusai.hoku_input_keyboard_set_key(input.raw, hkey, true) unless hkey.nil?
    LibHokusai.hoku_input_keyboard_stop(input.raw)

    return true
  when SDL::KEYUP
    modifier = event[:key][:keysym][:mod]
    code = event[:key][:keysym][:sym]
    hkey = Keys[code]

    LibHokusai.hoku_input_keyboard_start(input.raw)
    Modifiers.each do |(sdlk, hkey)|
      if modifier & sdlk == sdlk
        LibHokusai.hoku_input_keyboard_set_key(input.raw, hkey, false)
      end
    end

    LibHokusai.hoku_input_keyboard_set_key(input.raw, hkey, false) unless hkey.nil?
    LibHokusai.hoku_input_keyboard_stop(input.raw)
    return true
  when SDL::WINDOWEVENT
    if event[:window][:event] == SDL::WINDOWEVENT_RESIZED
      self.render_width = event[:window][:data1]
      self.render_height = event[:window][:data2]

      # free all static font textures
      self.class.fonts.each do |k, payload|
        texture, *_ = payload

        SDL.DestroyTexture(texture)
      end

      self.class.fonts.clear
    elsif event[:window][:event] == SDL::WINDOWEVENT_MOVED
      # pp ["moved", Time.now.strftime("%H:%M:%S %L")]
    end

    return true
  when SDL::MOUSEMOTION
    if input.raw[:mouse][:delta][:y] > 0
      # LibHokusai.hoku_input_mouse_set_scroll(input.raw, 0.0)
      input.raw[:mouse][:delta][:y] = 0.0
      input.raw[:mouse][:scroll_delta] = 0.0
      input.raw[:mouse][:scroll] = event[:motion][:y]
    end

    # pp ["set mouse", Time.now.strftime("%H:%M:%S %L")]
    hoku_mouse_pos = LibHokusai::HmlVec2.create(event[:motion][:x], event[:motion][:y])
    LibHokusai.hoku_input_set_mouse_position(input.raw, hoku_mouse_pos)

    # clear any click events
    [[:left, 0], [:right, 2], [:middle, 1]].each do |(btn, i)|
      button = input.raw[:mouse][btn]
      button[:clicked] = false
      LibHokusai.hoku_input_mouse_set_button(input.raw, button, i)
    end

    return true
  when SDL::MOUSEWHEEL
    LibHokusai.hoku_input_mouse_set_scroll(input.raw, event[:wheel][:preciseY])
    input.raw[:mouse][:delta][:y] = event[:wheel][:preciseY]

    # clear any click events
    [[:left, 0], [:right, 2], [:middle, 1]].each do |(btn, i)|
      button = input.raw[:mouse][btn]
      button[:clicked] = false
      LibHokusai.hoku_input_mouse_set_button(input.raw, button, i)
    end
    return true
  when SDL::MOUSEBUTTONDOWN
    clicked = event[:button][:clicks] > 0
    button = mouse_button(down: true, clicked: clicked)

    # LibHokusai.hoku_input_mouse_set_scroll(input.raw, 0.0)
    # input.raw[:mouse][:delta][:y] = 0.0

    LibHokusai.hoku_input_mouse_set_button(input.raw, button, event[:button][:which])
    return true
  when SDL::MOUSEBUTTONUP
    button = mouse_button(up: true)
    #
    # LibHokusai.hoku_input_mouse_set_scroll(input.raw, 0.0)
    # input.raw[:mouse][:delta][:y] = 0.0

    LibHokusai.hoku_input_mouse_set_button(input.raw, button, event[:button][:which])
    return true
  when SDL::TEXTINPUT
    return false
  else
    false
  end
end

#register_command_handlers(renderer, window) ⇒ Object 



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# File 'ui/src/hokusai/backends/sdl2.rb', line 312

def register_command_handlers(renderer, window)
  Hokusai.on_set_mouse_cursor do |type|
    sdl = self.class.cursors[type]
    SDL.SetCursor(sdl)
  end

  Hokusai.on_maximize_window do
    SDL.MaximizeWindow(window)
  end

  Hokusai.on_close_window do
    self.class.stopped = true
  end

  Hokusai.on_minimize_window do
    SDL.MinimizeWindow(window)
  end

  Hokusai.on_set_window_position do |(ox, oy)|
    xp = FFI::MemoryPointer.new :int
    yp = FFI::MemoryPointer.new :int

    SDL.GetWindowPosition(window, xp, yp)

    x = xp.read_int
    y = yp.read_int

    SDL.SetWindowPosition(window, (x + ox).to_i, (y + oy).to_i)
    xp.free
    yp.free
  end

  Hokusai.on_renderable do |canvas|
    inside_scissor(canvas.x, canvas.y, canvas.height)
  end

  Hokusai::Commands::ScissorBegin.on_draw do |command|
    rect = sdl_rect(command.x, command.y, command.width, command.height)
    SDL.RenderSetClipRect(renderer, rect)

    @scissor = [command.x, command.y, command.width, command.height]
  end

  Hokusai::Commands::ScissorEnd.on_draw do |_|
    SDL.RenderSetClipRect(renderer, nil)

    @scissor = nil
  end

  Hokusai::Commands::Circle.on_draw do |command|
    next unless inside_scissor(command.x, command.y)

    if command.outline > 0 && command.outline_color.a > 0
      SDL.filledCircleRGBA(
        renderer,
        command.x,
        command.y,
        command.radius + command.outline,
        command.color.r, command.color.g, command.color.b, command.color.a)
    end

    SDL.filledCircleRGBA(
      renderer,
      command.x,
      command.y,
      command.radius,
      command.color.r, command.color.g, command.color.b, command.color.a
    )
  end

  Hokusai::Commands::Image.on_draw do |command|
    next unless inside_scissor(command.x, command.y, command.height)

    texture = begin
                if self.class.images[command.source]
                  self.class.images[command.source]
                else
                  surface_ptr = SDL.IMG_Load(command.source)
                  if surface_ptr.null?
                    raise Hokusai::Error.new("Can't load Image: #{SDL.GetError.read_string}")
                  end

                  texture = SDL.CreateTextureFromSurface(renderer, surface_ptr)
                  self.class.images[command.source] = texture
                  SDL.FreeSurface(surface_ptr)
                  texture
                end
              end

    rect = sdl_rect(command.x, command.y, command.width, command.height)
    SDL.RenderCopy(renderer, texture, nil, rect)
  end

  Hokusai::Commands::Rect.on_draw do |command|
    next unless inside_scissor(command.x, command.y, command.height)
    # draw background first
    x, y, w, h = [command.x, command.y, command.width, command.height]

    if command.outline_uniform? && command.rounding > 0 && command.outline_color.a > 0
      SDL.roundedBoxRGBA(
        renderer, x, y, x + w, y + h, (command.rounding).ceil.to_i,
        command.outline_color.r,
        command.outline_color.g,
        command.outline_color.b,
        command.outline_color.a
      )
    elsif command.outline_uniform? && command.rounding <= 0 && command.outline_color.a > 0
      SDL.boxRGBA(
        renderer, x, y, x + w, y + h,
        command.outline_color.r,
        command.outline_color.g,
        command.outline_color.b,
        command.outline_color.a
      )
    elsif command.outline_color.a > 0 && command.rounding <= 0
      # x, y, w, h = command.background_boundary
      if command.outline.top > 0
        SDL.thickLineRGBA(
          renderer,
          x, y + (command.outline.top / 2), x + w, y + (command.outline.top / 2),
          command.outline.top,
          command.outline_color.r,
          command.outline_color.g,
          command.outline_color.b,
          command.outline_color.a
        )
      end

      if command.outline.right > 0
        SDL.thickLineRGBA(
          renderer,
          x + w - (command.outline.right / 2), y, x + w - (command.outline.right / 2), y + h,
          command.outline.right,
          command.outline_color.r,
          command.outline_color.g,
          command.outline_color.b,
          command.outline_color.a
        )
      end

      if command.outline.bottom > 0
        SDL.thickLineRGBA(
          renderer,
          x, y + h - (command.outline.bottom / 2), x + w, y + h - (command.outline.bottom / 2),
          command.outline.bottom,
          command.outline_color.r,
          command.outline_color.g,
          command.outline_color.b,
          command.outline_color.a
        )
      end

      if command.outline.left > 0
        SDL.thickLineRGBA(
          renderer,
          x + (command.outline.left / 2), y , x + (command.outline.left / 2), y + h,
          command.outline.left,
          command.outline_color.r,
          command.outline_color.g,
          command.outline_color.b,
          command.outline_color.a
        )
      end
    end


    x, y, w, h = command.background_boundary
    rounding = command.rounding

    if command.rounding > 0
      pp command.color
      SDL.roundedBoxRGBA(renderer, x, y, x + w, y + h, (command.rounding).ceil.to_i, command.color.r, command.color.g, command.color.b, command.color.a)
    else
      rect = SDL::Rect.new
      rect[:x] = x
      rect[:y] = y
      rect[:w] = w
      rect[:h] = h

      SDL.SetRenderDrawColor(renderer, command.color.r, command.color.g, command.color.b, command.color.a)
      SDL.RenderFillRect(renderer, rect)
    end
  end

  Hokusai::Commands::Text.on_draw do |command|
    next unless inside_scissor(command.x, command.y, command.size)

    unless command.content.empty?
      payload = begin
                  if self.class.fonts[command.hash] && command.static
                    self.class.fonts[command.hash]
                  else
                    font = (!command.font.nil? ? Hokusai.fonts.get(command.font) : Hokusai.fonts.active)
                    font.size = command.size
                    surface_ptr = font.render(command.content, command.color, bold: command.bold, italic: command.italic)
                    texture = SDL.CreateTextureFromSurface(renderer, surface_ptr)
                    surface = SDL::Surface.new(surface_ptr)
                    load = [texture, surface[:w], surface[:h]]
                    self.class.fonts[command.hash] = load
                    SDL.FreeSurface(surface_ptr)
                    load
                  end
                end

      texture, width, height = payload

      SDL.RenderCopy(renderer, texture, nil, sdl_rect(
        command.x + command.padding.left,
        command.y + command.padding.top,
        width,# - (command.padding.left + command.padding.right),
        height# - (command.padding.top + command.padding.bottom)
      ))
      SDL.DestroyTexture(texture) unless command.static
    end
  end
end

#reset_keys(input) ⇒ Object 



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# File 'ui/src/hokusai/backends/sdl2.rb', line 159

def reset_keys(input)
  LibHokusai.hoku_input_keyboard_start(input.raw)
  Modifiers.each do |(sdlk, hkey)|
    LibHokusai.hoku_input_keyboard_set_key(input.raw, hkey, false)
  end

  Keys.values.each do |hkey|
    LibHokusai.hoku_input_keyboard_set_key(input.raw, hkey, false)
  end

  LibHokusai.hoku_input_keyboard_stop(input.raw)
end

#run(block) ⇒ Object 



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# File 'ui/src/hokusai/backends/sdl2.rb', line 59

def run(block)
  resize = true
  self.render_width = config.width
  self.render_height = config.height

  case RbConfig::CONFIG['host_os']
  when /darwin/
    SDL.load_lib(
      "#{SDL_PATH}/libSDL2.dylib",
      true,
      gfx_libpath: "#{SDL_PATH}/libSDL2_gfx.dylib",
      ttf_libpath: "#{SDL_PATH}/libSDL2_ttf.dylib",
      image_libpath: "#{SDL_PATH}/libSDL2_image.dylib"
    )
  when /mswin|msys|mingw/
    SDL.load_lib("#{SDL_PATH}/SDL2.dll", true, gfx_libpath: "#{SDL_PATH}/libSDL2_gfx.dll" )
  when /linux/
    SDL.load_lib(
      "#{SDL_PATH}/libSDL2.so", true,
      gfx_libpath: "#{SDL_PATH}/libSDL2_gfx.so",
      ttf_libpath: "#{SDL_PATH}/libSDL2_ttf.so",
      image_libpath: "#{SDL_PATH}/libSDL2_image.so"
    )
  end
  SDL.Init(config.init_flags)
  SDL.TTF_Init

  window = SDL.CreateWindow(config.title, 30, 30, render_width, render_height, config.window_config_flags)
  SDL.SetWindowPosition(window, SDL::WINDOWPOS_CENTERED_MASK, SDL::WINDOWPOS_CENTERED_MASK)
  renderer = SDL.CreateRenderer(window, -1, SDL::RENDERER_TARGETTEXTURE | SDL::RENDERER_ACCELERATED)

  Hokusai.fonts.register "default", SDLBackend::Font.from("#{__dir__}/sdl2/Monaco.ttf", 121)
  Hokusai.fonts.activate "default"
  config.after_load_cb&.call

  register_command_handlers(renderer, window)
  # MemoryProfiler.start if ENV["PROFILE"]

  ptr = FFI::MemoryPointer.new :pointer
  LibHokusai.hoku_input_init(ptr)
  raw = LibHokusai::HmlInput.new(ptr.get_pointer(0))
  input = Hokusai::Input.new(raw)
  canvas = Hokusai::Canvas.new(render_width.to_f, render_height.to_f)
  event = SDL::Event.new

  loop do
    SDL.WaitEvent(event)
    break if event[:common][:type] == SDL::QUIT || self.class.stopped
    if process_input(input, event)
      # since we are using wait event, we need to process the render twice
      # once to capture all events, and once after updating block state.
      SDL.SetRenderDrawBlendMode(renderer, SDL::BLENDMODE_NONE)
      SDL.SetRenderDrawColor(renderer, config.background[:r], config.background[:g], config.background[:b], config.background[:a])
      SDL.RenderClear(renderer)
      canvas.reset(nil, nil, render_width.to_f, render_height.to_f)
      painter = Hokusai::Painter.new(block, input)
      painter.render(canvas, resize)
      block.update
      SDL.RenderPresent(renderer)

      SDL.SetRenderDrawBlendMode(renderer, SDL::BLENDMODE_NONE)
      SDL.SetRenderDrawColor(renderer, config.background[:r], config.background[:g], config.background[:b], config.background[:a])
      SDL.RenderClear(renderer)
      canvas.reset(nil, nil, render_width.to_f, render_height.to_f)
      painter = Hokusai::Painter.new(block, input)
      painter.render(canvas, resize, capture: false)
      SDL.RenderPresent(renderer)
    end
  end

  LibHokusai.hoku_input_free(input.raw)
  if ENV["PROFILE"]
    # report = MemoryProfiler.stop
    # report.pretty_print
  end
end

#sdl_rect(x, y, w, h) ⇒ Object 



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# File 'ui/src/hokusai/backends/sdl2.rb', line 149

def sdl_rect(x, y, w, h)
  @sdl_rect ||= SDL::Rect.new
  @sdl_rect[:x] = x
  @sdl_rect[:y] = y
  @sdl_rect[:w] = w
  @sdl_rect[:h] = h

  @sdl_rect
end