ref: 5cf1754b08aa6903f01b839c917169e6dc8c260f
parent: c26d758fee2bc3a3af617430378bc7649d8f7b67
author: yenatch <[email protected]>
date: Wed Jun 12 08:38:28 EDT 2013
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.
--- a/extras/gfx.py
+++ b/extras/gfx.py
@@ -1183,6 +1183,12 @@
blue = word & 0b11111
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):
@@ -1303,17 +1309,13 @@
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))
@@ -1322,7 +1324,7 @@
# turn the flat values into something more workable
pixel_length = 4 # rgba
- image = []
+ image = []
# while we're at it, let's size up the palette
@@ -1331,18 +1333,31 @@
for line in rgba:
newline = []
for pixel in range(len(line)/pixel_length):
- i = pixel*pixel_length
+ i = pixel * pixel_length
color = { 'r': line[i ],'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,@@ -1349,35 +1364,18 @@
'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))
+ # 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)
- # 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
-
+ # 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 @@
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):