Module: Morandi::Utils

Defined in:
lib/morandi/utils.rb

Class Method Summary collapse

Class Method Details

.apply_crop(pixbuf, x, y, w, h, fill_col = 0xffffffff) ⇒ Object 



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# File 'lib/morandi/utils.rb', line 45

def apply_crop(pixbuf, x, y, w, h, fill_col = 0xffffffff)
  if (x < 0) or (y < 0) || ((x+w) > pixbuf.width) || ((y+h) > pixbuf.height)
    #tw, th = [w-x,w].max, [h-y,h].max
    base_pixbuf = Gdk::Pixbuf.new(Gdk::Pixbuf::ColorSpace::RGB, false, 8, w, h)
    base_pixbuf.fill!(fill_col)
    dest_x = [x, 0].min
    dest_y = [y, 0].min
    #src_x = [x,0].max
    #src_y = [y,0].max
    dest_x = [-x,0].max
    dest_y = [-y,0].max

    #if x < 0
    #else
    #end
    #if y < 0
    #  dest_h = [h-dest_y, pixbuf.height, base_pixbuf.height-dest_y].min
    #else
    #	dest_h = [h,pixbuf.height].min
    #end
    #  dest_w  = [w-dest_x, pixbuf.width, base_pixbuf.width-dest_x].min

    offset_x = [x,0].max
    offset_y = [y,0].max
    copy_w = [w, pixbuf.width - offset_x].min
    copy_h = [h, pixbuf.height - offset_y].min

    paste_x = [x, 0].min * -1
    paste_y = [y, 0].min * -1

    if copy_w + paste_x > base_pixbuf.width
      copy_w = base_pixbuf.width - paste_x
    end
    if copy_h + paste_y > base_pixbuf.height
      copy_h = base_pixbuf.height - paste_y
    end

    args = [pixbuf, paste_x, paste_y, copy_w, copy_h, paste_x - offset_x, paste_y - offset_y, 1, 1, Gdk::Pixbuf::INTERP_HYPER, 255]
    #p args
    base_pixbuf.composite!(*args)
    pixbuf = base_pixbuf
  else
    x = constrain(x, 0, pixbuf.width)
    y = constrain(y, 0, pixbuf.height)
    w = constrain(w, 1, pixbuf.width - x)
    h = constrain(h, 1, pixbuf.height - y)
    #p [pixbuf, x, y, w, h]
    pixbuf = Gdk::Pixbuf.new(pixbuf, x, y, w, h)
  end
  pixbuf
end

.autocrop_coords(iw, ih, width, height) ⇒ Object 



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# File 'lib/morandi/utils.rb', line 4

def autocrop_coords(iw, ih, width, height)
  return nil unless width
  aspect = width.to_f / height.to_f
  iaspect = iw.to_f / ih.to_f

  if ih > iw
    # Portrait image
    # Check whether the aspect ratio is greater or smaller
    # ie. where constraints will hit
    aspect = height.to_f / width.to_f
  end

  # Landscape
  if aspect > iaspect
    # Width constraint - aspect-rect wider
    crop_width  = iw
    crop_height = (crop_width / aspect).to_i
  else
    # Height constraint - aspect-rect wider
    crop_height = ih
    crop_width  = (crop_height * aspect).to_i
  end

  [
    ((iw - crop_width)>>1),
    ((ih - crop_height)>>1),
    crop_width,
    crop_height
  ].map { |i| i.to_i }
end

.constrain(val, min, max) ⇒ Object 



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# File 'lib/morandi/utils.rb', line 35

def constrain(val,min,max)
  if val < min
    min
  elsif val > max
    max
  else
    val
  end
end