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Add support for converting PNG to EPD with pixel data format 2 (for gen 1 controller) #1

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Add support for converting PNG to EPD with pixel data format 2 (for gen 1 controller) #1

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37 changes: 31 additions & 6 deletions tools/epd_convert.py
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Original file line number Diff line number Diff line change
Expand Up @@ -68,21 +68,44 @@ def fail(msg):
'''
BYTES_PER_LINE = 20

def convert(im):
def convert(im, epd_format):
if not epd_format == 0 and not epd_format == 2:
raise ValueError('EPD format type {} not implemented'.format(epd_format))

assert im.size == (400, 300)
assert im.mode == '1'

data = EPD_HEADER[:]

# EPD pixel data format type 0
# Set pixel data format in header
data[6] = epd_format

# EPD pixel data format type 0 and 2
for stride in xrange(im.size[0] * im.size[1] / 8):
x = (stride * 8) % im.size[0]
y = (stride * 8) / im.size[0]

val = 0

# Data format type 2
# Input byte 0: assign to output byte bit 0
# Input byte 1: assign to output byte bit 2
# Input byte 2: assign to output byte bit 4
# Input byte 3: assign to output byte bit 6
# Input byte 4: assign to output byte bit 1
# Input byte 5: assign to output byte bit 3
# Input byte 6: assign to output byte bit 5
# Input byte 7: assign to output byte bit 7

# for type 2
trans = [0, 2, 4, 6, 1, 3, 5, 7]

for offs in xrange(8):
if im.getpixel((x + offs, y)) == 0:
val |= 1 << (7 - offs)
if epd_format == 0:
val |= 1 << (7 - offs)
elif epd_format == 2:
val |= 1 << (7 - trans[offs])

data.append(val)

Expand All @@ -103,6 +126,8 @@ def parse_args():
parser.add_argument('outfile', help='Output file (header file)')
parser.add_argument('--type', '-t', choices=['cheader', 'binary'], default='cheader',
help='Output type')
parser.add_argument('--epdformat', '-e', choices=['0', '2', '4'], default='0',
help='EPD format type')

return parser.parse_args()

Expand All @@ -115,8 +140,8 @@ def run():

input_image = Image.open(args.infile)

logger.info('input file=%s size=%s format=%s mode=%s' % (args.infile, input_image.size,
input_image.format, input_image.mode))
logger.info('input file=%s size=%s format=%s epd_format=%s mode=%s' % (args.infile, input_image.size,
input_image.format, args.epdformat, input_image.mode))
if input_image.size != (400, 300):
logger.warning('the input image will be scaled to 400x300')
input_image = input_image.resize((400, 300))
Expand All @@ -125,7 +150,7 @@ def run():
logger.warning('the input image mode will be converted to bitmap')
input_image = input_image.convert('1')

data = convert(input_image)
data = convert(input_image, int(args.epdformat))

logger.info('Output type: %s' % args.type)
if args.type == 'cheader':
Expand Down