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read_sprites.py
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read_sprites.py
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#-------------------------------------------------------------------------------
# Read Sprites
#
# Author: Shawn Hymel
# Date: April 12, 2014
# License: This code is beerware; if you see me (or any other SparkFun employee)
# at the local, and you've found our code helpful, please buy us a round!
# Distributed as-is; no warranty is given.
#
# Reads 8x8 sprites from sprites/ directory and converts them to LED array
# values. These values are stored in a text file in the root directory of the
# project. They are needed by the main Kilroy script.
#-------------------------------------------------------------------------------
import os
import sys
#-------------------------------------------------------------------------------
# Constants
#-------------------------------------------------------------------------------
# Output file
OUTPUT_FILE = 'ledmaps.txt'
# Sprite dictionary keys and filenames (e.g. [<key>, <filename>] )
SPRITE_FILES = [['1 left', 'eye_1_left.bmp'], \
['1 right', 'eye_1_right.bmp'], \
['2 left', 'eye_2_left.bmp'], \
['2 right', 'eye_2_right.bmp'], \
['3 left', 'eye_3_left.bmp'], \
['3 right', 'eye_3_right.bmp'], \
['angry left', 'eye_angry_left.bmp'], \
['angry right', 'eye_angry_right.bmp'], \
['camclose left', 'eye_camclose_left.bmp'], \
['camclose right', 'eye_camclose_right.bmp'], \
['camopen left', 'eye_camopen_left.bmp'], \
['camopen right', 'eye_camopen_right.bmp'], \
['closed left', 'eye_closed_left.bmp'], \
['closed right', 'eye_closed_right.bmp'], \
['dead left', 'eye_dead_left.bmp'], \
['dead right', 'eye_dead_right.bmp'], \
['happy left', 'eye_happy_left.bmp'], \
['happy right', 'eye_happy_right.bmp'], \
['heart left', 'eye_heart_left.bmp'], \
['heart right', 'eye_heart_right.bmp'], \
['lookleft left', 'eye_lookleft_left.bmp'], \
['lookleft right', 'eye_lookleft_right.bmp'], \
['lookright left', 'eye_lookright_left.bmp'], \
['lookright right', 'eye_lookright_right.bmp'], \
['open left', 'eye_open_left.bmp'], \
['open right', 'eye_open_right.bmp'], \
['sad left', 'eye_sad_left.bmp'], \
['sad right', 'eye_sad_right.bmp'], \
['sleepy left', 'eye_sleepy_left.bmp'], \
['sleepy right', 'eye_sleepy_right.bmp']]
# Global constants
NIBBLES_PER_BYTE = 2
BYTES_PER_PIXEL = 3
R = 0
G = 1
B = 2
#-------------------------------------------------------------------------------
# Functions
#-------------------------------------------------------------------------------
# Flip endian of string byte array (hex)
def flip_endian(str_num):
# Check if is not even length (bytes)
if len(str_num) % 2 != 0:
return -1
# Swap byte order
num_bytes = len(str_num) / 2
ans = ''
for b in range(0, num_bytes):
i = num_bytes - b - 1
ans = ans + str_num[(2*i):((2*i) + 2)]
return ans
# Map 0-255 bitmap value to 0 - 3 LED value
def map_led(val):
if (val <= 0):
return 0
if (val >= 1) and (val < 128):
return 1
if (val >= 128) and (val < 192):
return 2
if (val >= 192):
return 3
# Create list of bytes for LED matrix
def map_to_led(led_val):
# Convert list of strings to bytes for LED matrix
led_out = []
for y in led_val:
for n in y:
r_val = ((1 << 4) << int(n[0])) & 0xe0
g_val = ((1 << 1) << int(n[1])) & 0x1c
b_val = int(n[2])
pix_val = r_val + g_val + b_val
led_out.append(pix_val)
return led_out
#-------------------------------------------------------------------------------
# Main script
#-------------------------------------------------------------------------------
def read_sprites():
# Create blank dictionary
led_dict = {}
# Create array from each bitmap file
for bmp_file in SPRITE_FILES:
# Open file
file_path = 'sprites/' + bmp_file[1]
fn = os.path.join(os.path.dirname(__file__), file_path)
fd = open(fn, 'rb')
data = fd.read()
fd.close()
# Parse data
data = bytearray(data)
width = ''.join(format(x, '02x') for x in data[18:22])
height = ''.join(format(x, '02x') for x in data[22:26])
bitmap = ''.join(format(x, '02x') for x in data[54:])
# Find width and height
width = flip_endian(width)
width = int(width, 16)
height = flip_endian(height)
height = int(height, 16)
# Check to make sure bitmap is 8x8
if (width != 8) or (height != 8):
print 'ERROR: Bitmap ' + bmp_file + ' is not 8x8 pixels'
exit()
# Find padding in bytes
pad = width % 4
# Strip padding from bitmap data
led_string = ''
nib_in_img_width = (width * BYTES_PER_PIXEL * NIBBLES_PER_BYTE)
nib_in_row = nib_in_img_width + (pad * NIBBLES_PER_BYTE)
for i, c in enumerate(bitmap):
if ((i % nib_in_row) < nib_in_img_width):
led_string = led_string + c
# Flip endian-ness of array
led_string = flip_endian(led_string)
# Construct blank LED matrix
led_matrix = []
for y in range(0, height):
led_matrix.append([])
for x in range(0, width):
led_matrix[y].append([])
# Fill matrix with integer data from bitmap data
pix_num = 0
for y in range(0, height):
for x in range(0, width):
# Calculate index into bitmap array
byte_num = ((y * width) + x) * BYTES_PER_PIXEL
# Set RED value
byte_val = led_string[(byte_num + R) * 2] + \
led_string[((byte_num + R) * 2) + 1]
led_matrix[y][x].append(map_led(int(byte_val, 16)))
# Set GREEN value
byte_val = led_string[(byte_num + G) * 2] + \
led_string[((byte_num + G) * 2) + 1]
led_matrix[y][x].append(map_led(int(byte_val, 16)))
# Set BLUE value
byte_val = led_string[(byte_num + B) * 2] + \
led_string[((byte_num + B) * 2) + 1]
led_matrix[y][x].append(map_led(int(byte_val, 16)))
# Convert LED matrix to SparkFun Serial Backpack values
led_matrix = map_to_led(led_matrix)
# Add array to dictionary with keyname
led_dict[bmp_file[0]] = led_matrix
# Write dictionary to file
out_file = open(OUTPUT_FILE, 'w')
out_file.write(str(led_dict))
out_file.close()
# Run main
if __name__ == "__main__":
read_sprites()