Mercurial > repos > blastem
view img2tiles.py @ 2329:06d5e9b08bdb
Add NTSC composite shader by Sik
author | Michael Pavone <pavone@retrodev.com> |
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date | Wed, 23 Aug 2023 21:38:39 -0700 |
parents | dbbf0100f249 |
children |
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#!/usr/bin/env python3 from PIL import Image def gchannel(Val): return (Val >> 4) & 0xE threshold = 127 def get_rgba(im, pixels=None, idx=None, color=None): A = 255 if color is None: color = pixels[idx] if type(color) == int: R, G, B = im.getpalette()[color*3:color*3+3] else: if len(color) == 4: R, G, B, A = color elif len(color) == 3: R, G, B = color else: L, A = color R = G = B = L return (R, G, B, A) def get_gcolor(im, threshold, pixels=None, idx=None, color=None): R,G,B,A = get_rgba(im, pixels, idx, color) if A > threshold: return (gchannel(R), gchannel(G), gchannel(B)) return 0 def get_color_info(im, pixels, rng, threshold, exclude={}): gencolors = {} A = 255 pal = None transparent = False for idx in rng: gcolor = get_gcolor(im, threshold, pixels, idx) if type(gcolor) == tuple: if not gcolor in exclude: if gcolor in gencolors: gencolors[gcolor] += 1 else: gencolors[gcolor] = 1 else: transparent = True glist = [(gencolors[color], color) for color in gencolors] glist.sort() glist.reverse() return glist def get_color_info_both(im, pixels, rng, threshold, exclude={}): gencolors = {} A = 255 pal = None transparent = False for idx in rng: gcolor = get_gcolor(im, threshold, pixels, idx) if type(gcolor) == tuple: if not gcolor in exclude: if not gcolor in gencolors: _,best = best_match(gcolor, (exclude,)) gencolors[gcolor] = (color_dist(gcolor, best), 1) else: (dist, count) = gencolors[gcolor] gencolors[gcolor] = (dist, count+1) else: transparent = True glist = [(gencolors[color][0] * gencolors[color][1], color) for color in gencolors] glist.sort() glist.reverse() return glist def make_palette(im, trans_thresh, max_global, max_line): pixels = im.getdata() (width, height) = im.size colors = get_color_info(im, pixels, range(0, height * width), trans_thresh) print(len(colors), 'distinct 9-bit colors in image') glob_pal = {} print('Static Palette:') while len(glob_pal) < max_global and len(colors): idx = len(glob_pal) (count, color) = colors[0] print(str(idx) + ':', color) glob_pal[color] = idx colors = get_color_info_both(im, pixels, range(0, height * width), trans_thresh, glob_pal) line_pals = [] if max_global < len(colors): for line in range(0, height): linestart = line * width if len(glob_pal): linecolors = get_color_info_both(im, pixels, range(linestart, linestart+width), trans_thresh, glob_pal) else: linecolors = get_color_info(im, pixels, range(linestart, linestart+width), trans_thresh) line_pal = {} while len(line_pal) < max_line and len(linecolors): (score, color) = linecolors[0] line_pal[color] = len(line_pal) + max_global if len(line_pal) < max_line: combo = dict(glob_pal) for color in line_pal: combo[color] = line_pal[color] linecolors = get_color_info_both(im, pixels, range(linestart, linestart+width), trans_thresh, combo) #for idx in range(0, min(max_line, len(linecolors))): # (count, color) = linecolors[idx] # line_pal[color] = idx + max_global line_pals.append(line_pal) return (glob_pal, line_pals, max_global, max_line) def color_dist(a, b): (ra, ga, ba) = a (rb, gb, bb) = b return (ra-rb)**2 + (ga-gb)**2 + (ba-bb)**2 def best_match(gpixel, pals): bestdist = color_dist((0,0,0), (15, 15, 15)) bestpalidx = 0 bestcolor = (0,0,0) for i in range(0, len(pals)): pal = pals[i] for cur in pal: curdist = color_dist(gpixel, cur) if curdist < bestdist: bestdist = curdist bestpalidx = pal[cur] bestcolor = cur return (bestpalidx, bestcolor) def trans_image(im, trans_thresh, pal, chunky): (global_pal, line_pals, _, _) = pal pixels = im.getdata() (width, height) = im.size gpixels = [] A = 255 pal = None x = 0 y = 0 numchannels = len(im.getbands()) offset = 1 if numchannels == 4 or numchannels == 2 else 0 for pixel in pixels: if x == width: x = 0 y += 1 if width % 8 and not chunky: for i in range(0, 8-(width%8)): gpixels.append(0) gpixel = get_gcolor(im, trans_thresh, color=pixel) if type(gpixel) == tuple: if gpixel in global_pal: val = global_pal[gpixel] elif gpixel in line_pals[y]: val = line_pals[y][gpixel] else: bestpal,color = best_match(gpixel, (global_pal, line_pals[y])) val = bestpal gpixels.append(offset+val) else: gpixels.append(gpixel) x += 1 if width % 8 and not chunky: for i in range(0, 8-(width%8)): gpixels.append(0) width += 8-(width%8) if height % 8 and not chunky: for y in range(0, 8-(height%8)): for x in range(0, width): gpixels.append(0) height += 8-(height%8) return (width, height, gpixels) def appendword(b, word): b.append(word >> 8) b.append(word & 0xff) def to_tiles(palpix, raw=False, chunky=False, tile_height=8, sprite_order = False): (width, height, pixels) = palpix b = bytearray() if chunky: if not raw: appendword(b, width) appendword(b, height) for pixel in pixels: b.append(pixel) else: cwidth = width//8 cheight = height//tile_height words = len(pixels)//4 if not raw: appendword(b, words) appendword(b, cwidth) appendword(b, cheight) if sprite_order: for cx in range(0, cwidth): xstart = cx * 8 for cy in range(0, cheight): startoff = cy*tile_height*width + xstart for row in range(0, tile_height): rowoff = startoff + row*width for bytecol in range(0, 4): boff = bytecol * 2 + rowoff #print('boff:', boff, 'len(pixels)', len(pixels), 'cx', cx, 'cy', cy, 'cwidth', cwidth, 'cheight', cheight) #print('pixels[boff]:', pixels[boff]) b.append(pixels[boff] << 4 | pixels[boff+1]) else: for cy in range(0, cheight): ystart = cy*tile_height*width for cx in range(0, cwidth): startoff = (cx*8) + ystart for row in range(0, tile_height): rowoff = startoff + row*width for bytecol in range(0, 4): boff = bytecol * 2 + rowoff #print('boff:', boff, 'len(pixels)', len(pixels), 'cx', cx, 'cy', cy, 'cwidth', cwidth, 'cheight', cheight) #print('pixels[boff]:', pixels[boff]) b.append(pixels[boff] << 4 | pixels[boff+1]) return b def add_pal_entries(tiles, pal): (global_pal, line_pals, max_global, max_line) = pal tiles.append(max_global) tiles.append(max_line) pal_list = [(0, 0, 0)] * max_global for entry in global_pal: pal_list[global_pal[entry]] = entry for entry in pal_list: (R, G, B) = entry tiles.append(B) tiles.append(G << 4 | R) for line in line_pals: pal_list = [(0, 0, 0)] * max_line for entry in line: pal_list[line[entry]-max_global] = entry for entry in pal_list: (R, G, B) = entry tiles.append(B) tiles.append(G << 4 | R) def main(argv): posargs = [] omit_pal = raw = chunky = False expect_option = None options = {} tile_height = 8 sprite_order = False for i in range(1, len(argv)): if argv[i].startswith('-'): if argv[i] == '-r': raw = True elif argv[i] == '-p': omit_pal = True elif argv[i] == '-o': sprite_order = True elif argv[i] == '-c': chunky = True elif argv[i] == '-i': tile_height = 16 elif argv[i] == '-s' or argv[i] == '--spec': expect_option = 'specfile' else: print('Unrecognized switch', argv[i]) return elif not expect_option is None: options[expect_option] = argv[i] expect_option = None else: posargs.append(argv[i]) if len(posargs) < 2 and not ('specfile' in options and len(posargs) >= 1): print("Usage: img2tiles.py [OPTIONS] infile outfile [STATIC_COLORS [DYNAMIC_COLORS]]") return if 'specfile' in options: props = open(options['specfile']).read().strip().split(',') fname,static_colors,dynamic_colors = props[0:3] for prop in props[3:]: if prop == 'chunky': chunky = True elif prop == 'raw': raw = True elif prop == 'nopal': omit_pal = True elif prop == 'interlace': tile_height = 16 elif prop == 'sprite': sprite_order = True static_colors = int(static_colors) dynamic_colors = int(dynamic_colors) outfile = posargs[0] else: fname = posargs[0] outfile = posargs[1] static_colors = 8 dynamic_colors = 8 if len(posargs) > 2: static_colors = int(posargs[2]) dynamic_colors = 16-static_colors if len(posargs) > 3: dynamic_colors = int(posargs[3]) if dynamic_colors + static_colors > 16: print("No more than 16 combined dynamic and static colors are allowed") return im = Image.open(fname) pal = make_palette(im, threshold, static_colors, dynamic_colors) palpix = trans_image(im, threshold, pal, chunky) tiles = to_tiles(palpix, raw, chunky, tile_height, sprite_order) if not omit_pal: bits = add_pal_entries(tiles, pal) out = open(outfile, 'wb') out.write(tiles) if __name__ == '__main__': import sys main(sys.argv)