Mercurial > repos > ghero
view img2tiles.py @ 9:997690aa0507
Improve method for choosing line palette entries. Read number of global and dynamic colors from image binary. Go back to doing a word, longword, word pattern of writes for turning off display, doing DMA and turning it back on again to make things work correctly on the real hardware.
author | Mike Pavone <pavone@retrodev.com> |
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date | Wed, 04 Sep 2013 00:41:52 -0700 |
parents | a049de420cc1 |
children | eddc4ba6b0c3 |
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#!/usr/bin/env python from PIL import Image def gchannel(Val): return (Val >> 4) & 0xE threshold = 127 def get_color_info(pixels, rng, threshold, exclude={}): gencolors = {} A = 255 for idx in rng: color = pixels[idx] if len(color) == 4: (R, G, B, A) = color else: (R, G, B) = color if A > threshold: gcolor = (gchannel(R), gchannel(G), gchannel(B)) if not gcolor in exclude: if gcolor in gencolors: gencolors[gcolor] += 1 else: gencolors[gcolor] = 1 glist = [(gencolors[color], color) for color in gencolors] glist.sort() glist.reverse() return glist def get_color_info_error(pixels, rng, threshold, exclude={}): gencolors = {} A = 255 for idx in rng: color = pixels[idx] if len(color) == 4: (R, G, B, A) = color else: (R, G, B) = color if A > threshold: gcolor = (gchannel(R), gchannel(G), gchannel(B)) if not gcolor in exclude: if not gcolor in gencolors: _,best = best_match(gcolor, (exclude,)) gencolors[gcolor] = color_dist(gcolor, best) glist = [(gencolors[color], color) for color in gencolors] glist.sort() glist.reverse() return glist def get_color_info_both(pixels, rng, threshold, exclude={}): gencolors = {} A = 255 for idx in rng: color = pixels[idx] if len(color) == 4: (R, G, B, A) = color else: (R, G, B) = color if A > threshold: gcolor = (gchannel(R), gchannel(G), gchannel(B)) 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) glist = [(gencolors[color][0] * gencolors[color][1], color) for color in gencolors] glist.sort() glist.reverse() return glist def totiles(im, palette): pass def make_palette(im, trans_thresh, max_global, max_line): pixels = im.getdata() (width, height) = im.size colors = get_color_info(pixels, xrange(0, height * width), trans_thresh) print len(colors), 'distinct 9-bit colors in image' glob_pal = {} print 'Static Palette:' for idx in xrange(0, min(max_global, len(colors))): (count, color) = colors[idx] print str(idx) + ':', color, '(used', count, 'times)' glob_pal[color] = idx line_pals = [] if max_global < len(colors): for line in xrange(0, height): linestart = line * width #linecolors = get_color_info(pixels, xrange(linestart, linestart+width), trans_thresh, glob_pal) #linecolors = get_color_info_error(pixels, xrange(linestart, linestart+width), trans_thresh, glob_pal) linecolors = get_color_info_both(pixels, xrange(linestart, linestart+width), trans_thresh, glob_pal) 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(pixels, xrange(linestart, linestart+width), trans_thresh, combo) #for idx in xrange(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 xrange(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): (global_pal, line_pals, _, _) = pal pixels = im.getdata() (width, height) = im.size gpixels = [] A = 255 x = 0 y = 0 for pixel in pixels: if x == width: x = 0 y += 1 if width % 8: for i in xrange(0, 8-(width%8)): gpixels.append(0) if len(pixel) == 4: (R, G, B, A) = pixel else: (R, G, B) = pixel if A > trans_thresh: gpixel = (gchannel(R), gchannel(G), gchannel(B)) if gpixel in global_pal: gpixels.append(global_pal[gpixel]) elif gpixel in line_pals[y]: gpixels.append(line_pals[y][gpixel]) else: bestpal,color = best_match(gpixel, (global_pal, line_pals[y])) gpixels.append(bestpal) else: gpixels.append(0) x += 1 if width % 8: for i in xrange(0, 8-(width%8)): gpixels.append(0) width += 8-(width%8) if height % 8: for y in xrange(0, 8-(height%8)): for x in xrange(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): (width, height, pixels) = palpix b = bytearray() cwidth = width/8 cheight = height/8 words = len(pixels)/4 appendword(b, words) appendword(b, cwidth) appendword(b, cheight) for cy in xrange(0, cheight): ystart = cy*8*width for cx in xrange(0, cwidth): startoff = (cx*8) + ystart for row in xrange(0, 8): rowoff = startoff + row*width for bytecol in xrange(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): if len(argv) < 3: print "Not enough arguments" return fname = argv[1] static_colors = 8 dynamic_colors = 8 if len(argv) > 3: static_colors = int(argv[3]) dynamic_colors = 16-static_colors if len(argv) > 4: dynamic_colors = int(argv[4]) 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) tiles = to_tiles(palpix) bits = add_pal_entries(tiles, pal) out = open(argv[2], 'wb') out.write(tiles) if __name__ == '__main__': import sys main(sys.argv)