-Fixed brush factory : it was unable to draw on the picture !

-Added a script that do a convolution of the image with a matrix. Not sure it works perfect yet.


git-svn-id: svn://pulkomandy.tk/GrafX2/trunk@1252 416bcca6-2ee7-4201-b75f-2eb2f807beb1

scripts/aafilter.lua

@@ -0,0 +1,25 @@
+-- Get the picture size
+w, h = getpicturesize();
+
+-- Here is the filtering matrix
+ matrix = { { 1, 2, 3 }, { 4, 5, 6 }, { 7, 8, 9 } };
+
+-- Loop trough all the pixels
+-- To make this script simpler we don't handle the picture borders
+-- (the matrix would get pixels outside the picture space)
+-- for var = start_value, end_value, step do ...
+for y = 1, h - 2, 1 do
+	for x = 1, w - 2, 1 do
+		filtered =
+			matrix[1][1] * getpicturepixel(x - 1, y - 1) +
+			matrix[1][2] * getpicturepixel(x    , y - 1) +
+			matrix[1][3] * getpicturepixel(x + 1, y - 1) +
+			matrix[2][1] * getpicturepixel(x - 1, y    ) +
+			matrix[2][2] * getpicturepixel(x    , y    ) +
+			matrix[2][3] * getpicturepixel(x + 1, y    ) +
+			matrix[3][1] * getpicturepixel(x - 1, y + 1) +
+			matrix[3][2] * getpicturepixel(x    , y + 1) +
+			matrix[3][3] * getpicturepixel(x + 1, y + 1);
+		putpicturepixel(x,y,filtered);
+	end
+end