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pokecrystal
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gfx: handling for <4-color pngs when converting to 2bpp 

without a .pal file as reference, palettes are sorted by luminance.
pokemon crystal reads palettes exactly 4 colors in length.
if an image used fewer than 4 colors, invalid palettes were produced.

instead, dummy colors are inserted to pad out the palette.
This commit is contained in:
yenatch 2013-06-12 12:38:28 -04:00
parent c26d758fee
commit 5cf1754b08
1 changed files with 34 additions and 39 deletions
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69
extras/gfx.py
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@ -1184,6 +1184,12 @@ def dmg2rgb(word):
alpha = 255
return ((red<<3)+0b100, (green<<3)+0b100, (blue<<3)+0b100, alpha)
def rgb_to_dmg(color):
word = (color['r'] / 8) << 10
word += (color['g'] / 8) << 5
word += (color['b'] / 8)
return word
def png_pal(filename):
palette = []
@ -1303,17 +1309,13 @@ def to_2bpp(filein, fileout=None, palout=None):
greyscale = info[3]['greyscale']
# commented out for the moment
padding = { 'left': 0,
'right': 0,
'top': 0,
'bottom': 0, }
#if width % 8 != 0:
# padding['left'] = int(ceil((width / 8 + 8 - width) / 2))
# padding['right'] = int(floor((width / 8 + 8 - width) / 2))
#if height % 8 != 0:
# padding['top'] = int(ceil((height / 8 + 8 - height) / 2))
# padding['bottom'] = int(floor((height / 8 + 8 - height) / 2))
@ -1336,48 +1338,44 @@ def to_2bpp(filein, fileout=None, palout=None):
'g': line[i+1],
'b': line[i+2],
'a': line[i+3], }
newline.append(color)
if color not in palette: palette.append(color)
newline += [color]
if color not in palette: palette += [color]
image.append(newline)
# pad out any small palettes
hues = {
'white': { 'r': 0xff, 'g': 0xff, 'b': 0xff, 'a': 0xff },
'black': { 'r': 0x00, 'g': 0x00, 'b': 0x00, 'a': 0xff },
'grey': { 'r': 0x55, 'g': 0x55, 'b': 0x55, 'a': 0xff },
'gray': { 'r': 0xaa, 'g': 0xaa, 'b': 0xaa, 'a': 0xff },
}
while len(palette) < 4:
for hue in hues.values():
if not any(color is hue for color in palette):
palette += [hue]
if len(palette) >= 4: break
# sort by luminance, because we can
assert len(palette) <= 4, 'Palette should be 4 colors, is really ' + str(len(palette))
# sort by luminance
def luminance(color):
# this is actually in reverse, thanks to dmg/cgb palette ordering
rough = { 'r': 4.7,
'g': 1.4,
'b': 13.8, }
return sum(color[key] * -rough[key] for key in rough.keys())
palette = sorted(palette, key=luminance)
palette = sorted(palette, key = lambda x:luminance(x))
# no palette fixing for now
assert len(palette) <= 4, 'Palette should be 4 colors, is really ' + str(len(palette))
# spit out new palette (disabled for now)
def rgb_to_dmg(color):
word = (color['r'] / 8) << 10
word += (color['g'] / 8) << 5
word += (color['b'] / 8)
return word
palout = None
if palout != None:
output = []
for color in palette[1:3]:
word = rgb_to_dmg(color)
output.append(word>>8)
output.append(word&0xff)
to_file(palout, output)
# create a new map consisting of quaternary color ids
# spit out new .pal file
#if palout != None:
# output = []
# for color in palette[1:3]:
# word = rgb_to_dmg(color)
# output += [word & 0xff]
# output += [word >> 8]
# to_file(palout, output)
# create a new map of quaternary color ids
map = []
if padding['top']: map += [0] * (width + padding['left'] + padding['right']) * padding['top']
for line in image:
@ -1388,12 +1386,9 @@ def to_2bpp(filein, fileout=None, palout=None):
if padding['bottom']: map += [0] * (width + padding['left'] + padding['right']) * padding['bottom']
# split it into strips of 8, and make them planar
num_columns = width / 8
num_rows = height / 8
tile = 8 * 8
image = []
for row in range(num_rows):
for column in range(num_columns):