#    This file is part of the Minecraft Overviewer.
#
#    Minecraft Overviewer is free software: you can redistribute it and/or
#    modify it under the terms of the GNU General Public License as published
#    by the Free Software Foundation, either version 3 of the License, or (at
#    your option) any later version.
#
#    Minecraft Overviewer is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
#    Public License for more details.
#
#    You should have received a copy of the GNU General Public License along
#    with the Overviewer.  If not, see <http://www.gnu.org/licenses/>.

from PIL import Image
import textures

# Render 3 blending masks for lighting
# first is top (+Z), second is left (-X), third is right (+Y)
def generate_facemasks():
    white = Image.new("L", (24,24), 255)
    
    top = Image.new("L", (24,24), 0)
    left = Image.new("L", (24,24), 0)
    whole = Image.new("L", (24,24), 0)
    
    toppart = textures.Textures.transform_image_top(white)
    leftpart = textures.Textures.transform_image_side(white)
    
    # using the real PIL paste here (not alpha_over) because there is
    # no alpha channel (and it's mode "L")
    top.paste(toppart, (0,0))
    left.paste(leftpart, (0,6))
    right = left.transpose(Image.FLIP_LEFT_RIGHT)
    
    # Manually touch up 6 pixels that leave a gap, like in
    # textures._build_block()
    for x,y in [(13,23), (17,21), (21,19)]:
        right.putpixel((x,y), 255)
    for x,y in [(3,4), (7,2), (11,0)]:
        top.putpixel((x,y), 255)
    
    # special fix for chunk boundary stipple
    for x,y in [(13,11), (17,9), (21,7)]:
        right.putpixel((x,y), 0)
    
    return (top, left, right)
facemasks = generate_facemasks()
black_color = Image.new("RGB", (24,24), (0,0,0))
white_color = Image.new("RGB", (24,24), (255,255,255))

# Render 128 different color images for color coded depth blending in cave mode
def generate_depthcolors():
    depth_colors = []
    r = 255
    g = 0
    b = 0
    for z in range(128):
        depth_colors.append(r)
        depth_colors.append(g)
        depth_colors.append(b)
        
        if z < 32:
            g += 7
        elif z < 64:
            r -= 7
        elif z < 96:
            b += 7
        else:
            g -= 7

    return depth_colors
depth_colors = generate_depthcolors()