modules/assets: add a basic texture object

gamecore/modules/assets/init.lua

@@ -26,6 +26,8 @@ local Assets = Object:extend()
 
 local cwd  = (...):gsub('%.init$', '') .. "."
 
+local Texture     = require(cwd .. "texture")
+
 local Sprite      = require(cwd .. "sprites")
 local Font        = require(cwd .. "fonts")
 local ImageFont   = require(cwd .. "imagefonts")
@@ -123,11 +125,11 @@ end
 -- Background --
 
 function Assets:addImage(name, filename)
-  self.images[name] = love.graphics.newImage(filename)
+  self.images[name] = Texture(filename)
 end
 
 function Assets:drawImage(name, x, y, r, sx, sy, ox, oy, kx, ky)
-  love.graphics.draw(self.images[name], x, y, r, sx, sy, ox, oy, kx, ky)
+  self.images[name]:draw(x, y, r, sx, sy, ox, oy, kx, ky)
 end
 
 -- Images --

gamecore/modules/assets/texture.lua

@@ -0,0 +1,61 @@
+-- assets/texture :: the texture object, essentially used to be able to draw easily
+-- the mask of the texture (used for stuff like flashing sprite, etc)
+
+--[[
+  Copyright © 2019 Kazhnuz
+
+  Permission is hereby granted, free of charge, to any person obtaining a copy of
+  this software and associated documentation files (the "Software"), to deal in
+  the Software without restriction, including without limitation the rights to
+  use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+  the Software, and to permit persons to whom the Software is furnished to do so,
+  subject to the following conditions:
+
+  The above copyright notice and this permission notice shall be included in all
+  copies or substantial portions of the Software.
+
+  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+  FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+  COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+  IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+  CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+]]
+
+
+local Texture = Object:extend()
+
+local function getMask(x, y, r, g, b, a)
+    -- template for defining your own pixel mapping function
+    -- perform computations giving the new values for r, g, b and a
+    -- ...
+    return 1, 1, 1, a
+end
+
+function Texture:new(filename)
+  self.imageData = love.image.newImageData(filename)
+
+  local maskData  = self.imageData:clone()
+  maskData:mapPixel( getMask )
+
+  self.image = love.graphics.newImage( self.imageData )
+  self.mask  = love.graphics.newImage( maskData )
+end
+
+function Texture:draw(x, y, r, sx, sy, ox, oy, kx, ky)
+  love.graphics.draw(self.image, x, y, r, sx, sy, ox, oy, kx, ky)
+end
+
+function Texture:drawQuad(quad, x, y, r, sx, sy, ox, oy, kx, ky)
+  love.graphics.draw(self.image, quad, x, y, r, sx, sy, ox, oy, kx, ky)
+end
+
+function Texture:drawMask(x, y, r, sx, sy, ox, oy, kx, ky)
+  love.graphics.draw(self.mask, x, y, r, sx, sy, ox, oy, kx, ky)
+end
+
+function Texture:drawMaskQuad(quad, x, y, r, sx, sy, ox, oy, kx, ky)
+  love.graphics.draw(self.mask, quad, x, y, r, sx, sy, ox, oy, kx, ky)
+end
+
+return Texture