Class: NEXXT::Parser::PngExporter

Inherits:
Object
  • Object
show all
Defined in:
lib/nexxt/parser/png_exporter.rb

Constant Summary collapse

NES_PALETTE =

2C02 NES RGB palette (FCEUX-style), one RGB triple per palette index (0x00-0x3F).

[
  [0x7C, 0x7C, 0x7C], [0x00, 0x00, 0xFC], [0x00, 0x00, 0xBC], [0x44, 0x28, 0xBC],
  [0x94, 0x00, 0x84], [0xA8, 0x00, 0x20], [0xA8, 0x10, 0x00], [0x88, 0x14, 0x00],
  [0x50, 0x30, 0x00], [0x00, 0x78, 0x00], [0x00, 0x68, 0x00], [0x00, 0x58, 0x00],
  [0x00, 0x40, 0x58], [0x00, 0x00, 0x00], [0x00, 0x00, 0x00], [0x00, 0x00, 0x00],
  [0xBC, 0xBC, 0xBC], [0x00, 0x78, 0xF8], [0x00, 0x58, 0xF8], [0x68, 0x44, 0xFC],
  [0xD8, 0x00, 0xCC], [0xE4, 0x00, 0x58], [0xF8, 0x38, 0x00], [0xE4, 0x5C, 0x10],
  [0xAC, 0x7C, 0x00], [0x00, 0xB8, 0x00], [0x00, 0xA8, 0x00], [0x00, 0xA8, 0x44],
  [0x00, 0x88, 0x88], [0x00, 0x00, 0x00], [0x00, 0x00, 0x00], [0x00, 0x00, 0x00],
  [0xF8, 0xF8, 0xF8], [0x3C, 0xBC, 0xFC], [0x68, 0x88, 0xFC], [0x98, 0x78, 0xF8],
  [0xF8, 0x78, 0xF8], [0xF8, 0x58, 0x98], [0xF8, 0x78, 0x58], [0xFC, 0xA0, 0x44],
  [0xF8, 0xB8, 0x00], [0xB8, 0xF8, 0x18], [0x58, 0xD8, 0x54], [0x58, 0xF8, 0x98],
  [0x00, 0xE8, 0xD8], [0x78, 0x78, 0x78], [0x00, 0x00, 0x00], [0x00, 0x00, 0x00],
  [0xFC, 0xFC, 0xFC], [0xA4, 0xE4, 0xFC], [0xB8, 0xB8, 0xF8], [0xD8, 0xB8, 0xF8],
  [0xF8, 0xB8, 0xF8], [0xF8, 0xA4, 0xC0], [0xF0, 0xD0, 0xB0], [0xFC, 0xE0, 0xA8],
  [0xF8, 0xD8, 0x78], [0xD8, 0xF8, 0x78], [0xB8, 0xF8, 0xB8], [0xB8, 0xF8, 0xD8],
  [0x00, 0xFC, 0xFC], [0xF8, 0xD8, 0xF8], [0x00, 0x00, 0x00], [0x00, 0x00, 0x00]
].freeze
TILE_SIZE = 
8
BYTES_PER_TILE = 
16
CHR_BANK_SIZE = 
4096
PALETTE_BANK_SIZE = 
16
PNG_MAGIC = 
"\x89PNG\r\n\x1A\n".b.freeze

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(session, chr_bank: nil, palette_bank: nil, nes_palette: NES_PALETTE) ⇒ PngExporter

Returns a new instance of PngExporter.



39
40
41
42
43
44
45
46
 
# File 'lib/nexxt/parser/png_exporter.rb', line 39

def initialize(session, chr_bank: nil, palette_bank: nil, nes_palette: NES_PALETTE)
  @session = session
  @map = session.map or raise Error, 'Session has no nametable data'
  @chr_bank = chr_bank || session.flat_table['VarBankActive'].to_i
  @palette_bank = palette_bank || session.flat_table['VarPalBank'].to_i
  @nes_palette = nes_palette
  @palette = session.palette
end

Class Method Details

.export(session, path) ⇒ Object 



35
36
37
 
# File 'lib/nexxt/parser/png_exporter.rb', line 35

def self.export(session, path, **)
  new(session, **).write(path)
end

Instance Method Details

#pixels ⇒ Object 



56
57
58
59
60
61
62
63
64
 
# File 'lib/nexxt/parser/png_exporter.rb', line 56

def pixels
  height_px = @map.height * TILE_SIZE
  width_px = @map.width * TILE_SIZE
  matrix = Array.new(height_px) { Array.new(width_px) }
  (0...@map.height).each do |tile_row|
    (0...@map.width).each { |tile_col| render_tile(matrix, tile_row, tile_col) }
  end
  matrix
end

#to_png ⇒ Object 



52
53
54
 
# File 'lib/nexxt/parser/png_exporter.rb', line 52

def to_png
  encode_png(pixels)
end

#write(path) ⇒ Object 



48
49
50
 
# File 'lib/nexxt/parser/png_exporter.rb', line 48

def write(path)
  File.binwrite(path, to_png)
end