Class: Engine::Screenshoter

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

Class Method Summary collapse

Class Method Details

.scheduled_screenshot ⇒ Object 



7
8
9
 
# File 'lib/engine/screenshoter.rb', line 7

def self.scheduled_screenshot
  @after_screenshot != nil
end

.screenshot(&block) ⇒ Object 



3
4
5
 
# File 'lib/engine/screenshoter.rb', line 3

def self.screenshot(&block)
  @after_screenshot = block
end

.take_screenshot ⇒ Object 



11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
 
# File 'lib/engine/screenshoter.rb', line 11

def self.take_screenshot
  @scheduled_screenshot = nil
  width = Engine::Window.framebuffer_width
  height = Engine::Window.framebuffer_height
  pixels = ' ' * (width * height * 3)
  GL.ReadPixels(0, 0, width, height, GL::RGB, GL::UNSIGNED_BYTE, pixels)
  png = ChunkyPNG::Image.new(width, height, ChunkyPNG::Color::TRANSPARENT)
  pixels = pixels.bytes.map { |b| b.to_i }
  x = 0
  y = 0
  pixels.each_slice(3) do |r, g, b|
    png[x, height - y - 1] = ChunkyPNG::Color.rgb(r, g, b)
    x += 1
    if x >= width
      x = 0
      y += 1
    end
  end
  block = @after_screenshot
  @after_screenshot = nil
  block.call(png)
end