Class: TiArtistPattern

Inherits:
Ti99File show all
Defined in:
lib/native_file_types/ti99/TiArtistPattern.rb

Constant Summary collapse

TMS9918_PALLETE =

pallete taken from www.msx.org/forumtopic7147.html ragozini.googlepages.com/dithering

[
  PNG::Color.new(0,0,0,0xFF),	#color=$00 Transparent
  PNG::Color.new(0,0,0,0xFF),	#color=$01 black
  PNG::Color.new(38,229,0,0xFF),	#color=$02 medium green
  PNG::Color.new(100,240,49,0xFF),	#color=$03 light green
  PNG::Color.new(93,57,255,0xFF),	#color=$04 dark blue
  PNG::Color.new(132,94,255,0xFF),	#color=$05 light blue
  PNG::Color.new(214,104,20,0xFF),	#color=$06 dark red
  PNG::Color.new(64,228,255,0xFF),	#color=$07 cyan
  PNG::Color.new(253,111,15,0xFF),	#color=$08 medium red
  PNG::Color.new(255,245,49,0xFF),	#color=$09 light red
  PNG::Color.new(216,230,0,0xFF),	#color=$0A dark yellow
  PNG::Color.new(232,233,14,0xFF),	#color=$0B light yellow
  PNG::Color.new(40,202,0,0xFF),	#color=$0C dark green
  PNG::Color.new(205,86,255,0xFF),	#color=$0D magenta
  PNG::Color.new(208,208,208,0xFF),	#color=$0E grey
  PNG::Color.new(255,255,255,0xFF),	#color=$0F white
]

Instance Attribute Summary

Attributes inherited from NativeFileType

#aux_code, #contents, #file_system_image, #file_type, #filename, #meta_data

Instance Method Summary collapse

Methods inherited from Ti99File

file_system_file_types, #type_description

Methods inherited from NativeFileType

#<=>, #==, all_native_file_types, best_fit, code_for_tests, compatability_score, #data_without_header, file_type_matches?, #full_filename, #header_length, #initialize, is_valid_file_if, #load_address, load_address, matching_score, native_file_types_possible_on_file_system, non_matching_score, #to_hex_dump, #to_info_dump, #type_description

Methods included from SubclassTracking

extended

Constructor Details

This class inherits a constructor from NativeFileType

Instance Method Details

#picture_format ⇒ Object 



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# File 'lib/native_file_types/ti99/TiArtistPattern.rb', line 80

def picture_format
  :png
end

#picture_height ⇒ Object 



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# File 'lib/native_file_types/ti99/TiArtistPattern.rb', line 77

def picture_height
  192
end

#picture_width ⇒ Object 



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# File 'lib/native_file_types/ti99/TiArtistPattern.rb', line 74

def picture_width
  256
end

#to_picture ⇒ Object

formula taken from www.digitalstratum.com/programming/yinyang_ti_asm



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# File 'lib/native_file_types/ti99/TiArtistPattern.rb', line 38

def to_picture
  canvas = PNG::Canvas.new picture_width, picture_height, TMS9918_PALLETE[0]
  colour_attributes_filename=filename.sub(/_P$/,'_C')
  colour_attributes_file=file_system_image.files[colour_attributes_filename]
  if colour_attributes_file.nil? || colour_attributes_file.contents.length<6144 then    
    #colour_attributes=(0x4E.chr)*6144
    colour_attributes=(0x0F.chr)*6144
  else
    colour_attributes=colour_attributes_file.contents
  end

  picture_width.times do |x|
    picture_height.times do |y|  
      byte_offset=y<<5
      byte_offset|=y
      byte_offset&=0xFF07
      bit_offset=x % 0x08
      byte_offset+=x
      byte_offset-=bit_offset      
      bitmask=1<<(7-bit_offset)
      bitmap_byte=contents[byte_offset]
      colour_byte=colour_attributes[byte_offset]
      foreground_colour=TMS9918_PALLETE[colour_byte>>4]
      background_colour=TMS9918_PALLETE[colour_byte%16]
      if ((bitmap_byte & bitmask)==bitmask) then
        canvas[x, y]= foreground_colour
      else
        canvas[x, y]= background_colour
      end
    end
  end
  png = PNG.new canvas
  result=png.raw_bytes
  result
end