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#!/usr/bin/env python
'''This script converts from any image type supported by
Python imaging library to the RLE-encoded format used by
NxWidgets.
'''
from PIL import Image
def get_palette(img, maxcolors = 255):
'''Returns a list of colors. If there are too many colors in the image,
the least used are removed.
'''
img = img.convert("RGB")
colors = img.getcolors(65536)
colors.sort(key = lambda c: -c[0])
return [c[1] for c in colors[:maxcolors]]
def write_palette(outfile, palette):
'''Write the palette (normal and hilight) to the output file.'''
outfile.write('static const NXWidgets::nxwidget_pixel_t palette[BITMAP_PALETTESIZE] =\n');
outfile.write('{\n')
for i in range(0, len(palette), 4):
outfile.write(' ');
for r, g, b in palette[i:i+4]:
outfile.write('MKRGB(%3d,%3d,%3d), ' % (r, g, b))
outfile.write('\n');
outfile.write('};\n\n')
outfile.write('static const NXWidgets::nxwidget_pixel_t hilight_palette[BITMAP_PALETTESIZE] =\n');
outfile.write('{\n')
for i in range(0, len(palette), 4):
outfile.write(' ');
for r, g, b in palette[i:i+4]:
r = min(255, r + 50)
g = min(255, g + 50)
b = min(255, b + 50)
outfile.write('MKRGB(%3d,%3d,%3d), ' % (r, g, b))
outfile.write('\n');
outfile.write('};\n\n')
def quantize(color, palette):
'''Return the color index to closest match in the palette.'''
try:
return palette.index(color)
except ValueError:
# No exact match, search for the closest
def distance(color2):
return sum([(a - b)**2 for a, b in zip(color, color2)])
return palette.index(min(palette, key = distance));
def encode_row(img, palette, y):
'''RLE-encode one row of image data.'''
entries = []
color = None
repeats = 0
for x in range(0, img.size[0]):
c = quantize(img.getpixel((x, y)), palette)
if c == color:
repeats += 1
else:
if color is not None:
entries.append((repeats, color))
repeats = 1
color = c
if color is not None:
entries.append((repeats, color))
return entries
def write_image(outfile, img, palette):
'''Write the image contents to the output file.'''
outfile.write('static const NXWidgets::SRlePaletteBitmapEntry bitmap[] =\n');
outfile.write('{\n');
for y in range(0, img.size[1]):
entries = encode_row(img, palette, y)
row = ""
for r, c in entries:
if len(row) > 60:
outfile.write(' ' + row + '\n')
row = ""
row += '{%3d, %3d}, ' % (r, c)
row += ' ' * (73 - len(row))
outfile.write(' ' + row + '/* Row %d */\n' % y)
outfile.write('};\n\n');
def write_descriptor(outfile, name):
'''Write the public descriptor structure for the image.'''
outfile.write('extern const struct NXWidgets::SRlePaletteBitmap g_%s =\n' % name)
outfile.write('{\n')
outfile.write(' CONFIG_NXWIDGETS_BPP,\n')
outfile.write(' CONFIG_NXWIDGETS_FMT,\n')
outfile.write(' BITMAP_PALETTESIZE,\n')
outfile.write(' BITMAP_WIDTH,\n')
outfile.write(' BITMAP_HEIGHT,\n')
outfile.write(' {palette, hilight_palette},\n')
outfile.write(' bitmap\n')
outfile.write('};\n')
if __name__ == '__main__':
import sys
import os.path
if len(sys.argv) != 3:
print "Usage: bitmap_converter.py source.png output.cxx"
sys.exit(1)
img = Image.open(sys.argv[1])
outfile = open(sys.argv[2], 'w')
palette = get_palette(img)
outfile.write(
'''
/* Automatically NuttX bitmap file. */
/* Generated from %(src)s by bitmap_converter.py. */
#include <nxconfig.hxx>
#include <crlepalettebitmap.hxx>
#define BITMAP_WIDTH %(width)s
#define BITMAP_HEIGHT %(height)s
#define BITMAP_PALETTESIZE %(palettesize)s
''' % {'src': sys.argv[1], 'width': img.size[0], 'height': img.size[1],
'palettesize': len(palette)}
)
name = os.path.splitext(os.path.basename(sys.argv[1]))[0]
write_palette(outfile, palette)
write_image(outfile, img, palette)
write_descriptor(outfile, name)
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