Remove dependence on external asset for drawing pixel text

scripts/extract_font.cr

@@ -0,0 +1,26 @@
+require "../src/game"
+
+mapping : String = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789!?().,/\\[]{}$#+-“”‘’'\"@=><_"
+tiles = PF::Sprite.load_tiles("assets/pf-font.png", 7, 8)
+
+puts "CHARS = {"
+tiles.each_with_index do |tile, i|
+  if letter = mapping[i]?
+    if ['\\', '\''].includes? letter
+      print "  '\\#{letter}' => "
+    else
+      print "  '#{letter}'  => "
+    end
+
+    n = 0u64
+    mask = 1_u64 << (7 * 8)
+
+    tile.pixels.each do |pixel|
+      n |= mask if pixel >> 8 <= 127
+      mask >>= 1
+    end
+
+    puts "0x#{n.to_s(16).rjust(16, '0')}_u64,"
+  end
+end
+puts "}"

src/game.cr

@@ -18,7 +18,7 @@ module PF
     property screen : Sprite
 
     delegate :draw_point, :draw_line, :scan_line, :draw_circle, :draw_triangle, :draw_rect, :draw_shape,
-      :fill_triangle, :fill_rect, :fill_circle, :fill_shape, to: @screen
+      :fill_triangle, :fill_rect, :fill_circle, :fill_shape, :draw_string, to: @screen
 
     @fps_lasttime : Float64 = Time.monotonic.total_milliseconds # the last recorded time.
     @fps_current : UInt32 = 0                                   # the current FPS.

src/pixel.cr

@@ -68,6 +68,10 @@ module PF
       PF::Pixel.new((@r - n).to_u8, (@g - n).to_u8, (@b - n).to_u8, @a)
     end
 
+    def to_u
+      to_u32
+    end
+
     def to_u32
       value = @r.to_u32 << 24
       value |= @g.to_u32 << 16

src/sprite.cr

@@ -11,8 +11,8 @@ module PF
       tiles_x = sheet.width // tile_width
       tiles_y = sheet.height // tile_height
 
-      0.upto(tiles_x - 1) do |tx|
+      0.upto(tiles_y - 1) do |ty|
-        0.upto(tiles_y - 1) do |ty|
+        0.upto(tiles_x - 1) do |tx|
           sx = tx * tile_width
           sy = ty * tile_height
           sprite = Sprite.new(tile_width, tile_height)

src/sprite/draw_string.cr

@@ -0,0 +1,132 @@
+module PF
+  class Sprite
+    CHARS = {
+      'A'  => 0x007112244f912200_u64,
+      'B'  => 0x00f1122788913c00_u64,
+      'C'  => 0x0071120408111c00_u64,
+      'D'  => 0x00f1122448913c00_u64,
+      'E'  => 0x00f1020708103c00_u64,
+      'F'  => 0x00f1020788102000_u64,
+      'G'  => 0x0071122409911c00_u64,
+      'H'  => 0x00891227c8912200_u64,
+      'I'  => 0x0070408102041c00_u64,
+      'J'  => 0x0078204081121800_u64,
+      'K'  => 0x009122860a122400_u64,
+      'L'  => 0x0081020408103c00_u64,
+      'M'  => 0x0089b2a448912200_u64,
+      'N'  => 0x008992a4c8912200_u64,
+      'O'  => 0x0071122448911c00_u64,
+      'P'  => 0x00f1122788102000_u64,
+      'Q'  => 0x007112244a931e00_u64,
+      'R'  => 0x00f112278a122200_u64,
+      'S'  => 0x0071120380911c00_u64,
+      'T'  => 0x00f8408102040800_u64,
+      'U'  => 0x0089122448911c00_u64,
+      'V'  => 0x00891224488a0800_u64,
+      'W'  => 0x01064c9ab5512200_u64,
+      'X'  => 0x0089114105112200_u64,
+      'Y'  => 0x0089114102040800_u64,
+      'Z'  => 0x00f8104104103e00_u64,
+      'a'  => 0x0000018087121c00_u64,
+      'b'  => 0x0081038489123800_u64,
+      'c'  => 0x0000018488121800_u64,
+      'd'  => 0x001021c489121c00_u64,
+      'e'  => 0x000001848e101c00_u64,
+      'f'  => 0x0061220708102000_u64,
+      'g'  => 0x00000184890e0470_u64,
+      'h'  => 0x0081038489122400_u64,
+      'i'  => 0x0000400102040800_u64,
+      'j'  => 0x0000200081021410_u64,
+      'k'  => 0x008102450c142400_u64,
+      'l'  => 0x0000810204080800_u64,
+      'm'  => 0x000003454a912200_u64,
+      'n'  => 0x000002468b122400_u64,
+      'o'  => 0x0000018489121800_u64,
+      'p'  => 0x00000184891c2040_u64,
+      'q'  => 0x000001c4890e0408_u64,
+      'r'  => 0x0000018488102000_u64,
+      's'  => 0x000001c406023800_u64,
+      't'  => 0x0040838204080800_u64,
+      'u'  => 0x0000022448911c00_u64,
+      'v'  => 0x00000224488a0800_u64,
+      'w'  => 0x000002244a951400_u64,
+      'x'  => 0x00000222820a2200_u64,
+      'y'  => 0x00000224488f0238_u64,
+      'z'  => 0x000003e082083e00_u64,
+      '0'  => 0x007112654c911c00_u64,
+      '1'  => 0x0060408102041c00_u64,
+      '2'  => 0x0071102184103e00_u64,
+      '3'  => 0x0071102180911c00_u64,
+      '4'  => 0x00891223c0810200_u64,
+      '5'  => 0x00f9020780911c00_u64,
+      '6'  => 0x0071120788911c00_u64,
+      '7'  => 0x00f8104104081000_u64,
+      '8'  => 0x0071122388911c00_u64,
+      '9'  => 0x00711223c0911c00_u64,
+      '!'  => 0x0020408102000800_u64,
+      '?'  => 0x0071122182000800_u64,
+      '('  => 0x0020810204080800_u64,
+      ')'  => 0x0040408102041000_u64,
+      '.'  => 0x0000000000000800_u64,
+      ','  => 0x0000000000000410_u64,
+      '/'  => 0x0010408204102000_u64,
+      '\\' => 0x0080810102020400_u64,
+      '['  => 0x00c1020408103000_u64,
+      ']'  => 0x00c0810204083000_u64,
+      '{'  => 0x0060810404081800_u64,
+      '}'  => 0x00c0810104083000_u64,
+      '$'  => 0x0020f283829e0800_u64,
+      '#'  => 0x0050a3e28f8a1400_u64,
+      '+'  => 0x00004087c2040000_u64,
+      '-'  => 0x00000007c0000000_u64,
+      '“'  => 0x0041228100000000_u64,
+      '”'  => 0x0021214200000000_u64,
+      '‘'  => 0x0041020000000000_u64,
+      '’'  => 0x0080810000000000_u64,
+      '\'' => 0x0040810000000000_u64,
+      '"'  => 0x00a1428000000000_u64,
+      '@'  => 0x007112e54b901e00_u64,
+      '='  => 0x000003e00f800000_u64,
+      '>'  => 0x0040404041041000_u64,
+      '<'  => 0x0008208202020200_u64,
+      '_'  => 0x0000000000003e00_u64,
+    }
+    CHAR_WIDTH  = 7
+    CHAR_HEIGHT = 8
+
+    def draw_string(msg : String, x : Int, y : Int, color : Pixel = Pixel.black, bg : Pixel? = nil)
+      cur_y = 0
+      cur_x = 0
+      leading = 0
+
+      msg.chars.each do |c|
+        if c == '\n'
+          cur_y += 1
+          cur_x = 0
+          next
+        end
+
+        if char = CHARS[c]?
+          mask = 1_u64 << (CHAR_WIDTH * CHAR_HEIGHT)
+
+          0.upto(CHAR_HEIGHT - 1) do |cy|
+            0.upto(CHAR_WIDTH - 1) do |cx|
+              if mask & char > 0
+                draw_point(x + cx + (cur_x * CHAR_WIDTH), y + cy + (cur_y * (CHAR_HEIGHT + leading)), color)
+              elsif background = bg
+                draw_point(x + cx + (cur_x * CHAR_WIDTH), y + cy + (cur_y * (CHAR_HEIGHT + leading)), background)
+              end
+              mask >>= 1
+            end
+          end
+        end
+
+        cur_x += 1
+      end
+    end
+
+    def draw_string(msg : String, pos : Vector2(Int), color : Pixel = Pixel.black)
+      draw_string(msg, pos.x, pos.y, color)
+    end
+  end
+end