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quilt2native.py
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quilt2native.py
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#!/usr/bin/env python
#
# Take a "standard" Looking Glass quilt image and convert it into
# a "native" image that can be displayed directly on a specific LG.
#
# Partly based on https://github.com/lonetech/LookingGlass/blob/master/quiltshader.glsl
#
# https://forum.lookingglassfactory.com/t/combining-32-views/501/2
# The views go from the bottom left as the leftmost view, to the top right being the furthest right
# E.g. for a 4x8 quilt:
#
# 28 29 30 31
# 24 25 26 27
# 20 21 22 23
# 16 17 18 19
# 12 13 14 15
# 8 9 10 11
# 4 5 6 7
# 0 1 2 3
#
#
# Copyright (c) 2019, SURFsara BV
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# * Neither the name of SURFsara BV nor the
# names of its contributors may be used to endorse or promote products
# derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL SURFSARA BV BE LIABLE FOR ANY
# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
import sys, json
from math import atan, cos, floor
from PIL import Image
from calibration import Calibration
def usage():
print('usage: %s <visual.json> <quilt-image> [tilesh tilesv] <native-image>' % sys.argv[0])
print()
sys.exit(-1)
if len(sys.argv) not in [4,6]:
usage()
calibration = Calibration(sys.argv[1])
screenW = calibration.screenW
screenH = calibration.screenH
tilt = calibration.tilt
pitch = calibration.pitch
center = calibration.center
subp = calibration.subp
quilt_image_file = sys.argv[2]
if len(sys.argv) == 6:
TILES = tuple(map(int, sys.argv[3:5]))
native_image_file = sys.argv[5]
else:
TILES = (5, 9)
native_image_file = sys.argv[3]
INV_TILES = (1.0/TILES[0], 1.0/TILES[1])
def quilt_map(pos, a):
# Y major positive direction, X minor negative direction
tile = [TILES[0] - 1, 0]
a = a%1 * TILES[1]
tile[1] += floor(a)
a = a%1 * TILES[0]
tile[0] += -floor(a)
res = [pos[0] + tile[0], pos[1] + tile[1]]
res[0] /= TILES[0]
res[1] /= TILES[1]
return res
def quilt_tile(a):
# Y major positive direction, X minor negative direction
tile = [TILES[0] - 1, 0]
a = a%1 * TILES[1]
tile[1] += floor(a)
a = a%1 * TILES[0]
tile[0] += -floor(a)
return tile
def pixel_color(qpx, u, v):
a = (u + (1.0 - v)*tilt)*pitch - center
tile = quilt_tile(a)
r_pos = (
(u + tile[0]) * INV_TILES[0],
(v + tile[1]) * INV_TILES[1]
)
tile = quilt_tile(a + subp)
g_pos = (
(u + tile[0]) * INV_TILES[0],
(v + tile[1]) * INV_TILES[1]
)
tile = quilt_tile(a + 2*subp)
b_pos = (
(u + tile[0]) * INV_TILES[0],
(v + tile[1]) * INV_TILES[1]
)
#print(u, v, a, r_pos, g_pos, b_pos)
# XXX nearest-neighbour sampling
r = qpx[r_pos[0]*QWIDTH, r_pos[1]*QHEIGHT][0]
g = qpx[g_pos[0]*QWIDTH, g_pos[1]*QHEIGHT][1]
b = qpx[b_pos[0]*QWIDTH, b_pos[1]*QHEIGHT][2]
return (r, g, b)
quiltimg = Image.open(quilt_image_file)
QWIDTH, QHEIGHT = quiltimg.size
qpx = quiltimg.load()
outimg = Image.new('RGB', (screenW, screenH))
opx = outimg.load()
# XXX offset with 0.5 a pixel?
for j in range(screenH):
v = j / screenH
for i in range(screenW):
u = i / screenW
opx[i,j] = pixel_color(qpx, u, v)
del qpx
del opx
outimg.save(native_image_file)