gbdk-2020 | GameBoy Development Kit |
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gbdk-support/png2hicolorgb/src/tile_dedupe.c
1 #include <stdio.h>
2 #include <string.h>
3 #include <stdint.h>
4 #include <stdbool.h>
5
6 #include <common.h>
7 #include <defines.h>
8 #include <logging.h>
9 #include <options.h>
10
11
12 static void tile_calc_flip_gb2bpp(uint8_t * flipped_tile, const uint8_t* src_tile, bool flip_x, bool flip_y);
13 static void tile_generate_flips(const uint8_t * p_src_tile);
14
15 uint8_t tile_permutations[4 * TILE_SZ];
16 #define FLIP_X_YES true
17 #define FLIP_X_NO false
18 #define FLIP_Y_YES true
19 #define FLIP_Y_NO false
20
21 // These should match the order of tile flip permutations in tile_generate_flips()
22 const uint8_t tile_flip_flags[] = {
23 CGB_ATTR_NO_FLIP,
24 CGB_ATTR_HFLIP,
25 CGB_ATTR_VFLIP,
26 CGB_ATTR_HFLIP | CGB_ATTR_VFLIP};
27
28
29 const uint8_t bits_reverse_LUT[256] = {
30 0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0,
31 0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
32 0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8,
33 0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8,
34 0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4,
35 0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
36 0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec,
37 0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc,
38 0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2,
39 0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2,
40 0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea,
41 0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,
42 0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6,
43 0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6,
44 0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee,
45 0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe,
46 0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1,
47 0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,
48 0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9,
49 0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9,
50 0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5,
51 0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5,
52 0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed,
53 0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,
54 0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3,
55 0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3,
56 0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb,
57 0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb,
58 0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7,
59 0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
60 0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef,
61 0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff,
62 };
63
64
65 static void tile_calc_flip_gb2bpp(uint8_t * flipped_tile, const uint8_t * src_tile, bool flip_x, bool flip_y)
66 {
67 for (int ty = 0; ty < TILE_HEIGHT_PX; ty++) {
68 int y = flip_y ? (TILE_HEIGHT_PX - 1 - ty) : ty;
69 flipped_tile[2 * ty] = flip_x ? bits_reverse_LUT[src_tile[2 * y]] : src_tile[2 * y];
70 flipped_tile[2 * ty + 1] = flip_x ? bits_reverse_LUT[src_tile[2 * y + 1]] : src_tile[2 * y + 1];
71 }
72 }
73
74
75 // Generate all the X/Y flipped combinations of a 2bpp Game Boy tile
76 // Output is used for testing if CGB flipping map attributes allow for tile pattern deduplciation
77 //
78 // tile_permutations[] should be 4 x 16 bytes
79 static void tile_generate_flips(const uint8_t * p_src_tile)
80 {
81 tile_calc_flip_gb2bpp(&tile_permutations[0 * TILE_SZ], p_src_tile, FLIP_X_NO, FLIP_Y_NO);
82 tile_calc_flip_gb2bpp(&tile_permutations[1 * TILE_SZ], p_src_tile, FLIP_X_YES, FLIP_Y_NO);
83 tile_calc_flip_gb2bpp(&tile_permutations[2 * TILE_SZ], p_src_tile, FLIP_X_NO, FLIP_Y_YES);
84 tile_calc_flip_gb2bpp(&tile_permutations[3 * TILE_SZ], p_src_tile, FLIP_X_YES, FLIP_Y_YES);
85 }
86
87
88 // bool tileset_find_matching_tile(unsigned int source_tile_id, unsigned int * TileCountDeduped, uint8_t * new_tile_id, uint8_t * new_attribs)
89 bool tileset_find_matching_tile(const uint8_t * src_tile, const uint8_t * tile_set_deduped, const unsigned int tile_count_deduped, uint8_t * new_tile_id, uint8_t * new_attribs)
90 {
91 tile_generate_flips(src_tile);
92
93 for (unsigned int index_dedupe = 0; index_dedupe < tile_count_deduped; index_dedupe++) {
94
95 for (size_t f = 0; f < ARRAY_LEN(tile_flip_flags); f++) {
96 if (memcmp(&tile_set_deduped[index_dedupe * TILE_SZ], &tile_permutations[f * TILE_SZ], TILE_SZ) == 0) {
97
98 // Match Found
99 *new_tile_id = (uint8_t)(index_dedupe & 0xFFu);
100 *new_attribs = (index_dedupe < CGB_TILES_START_BANK_1) ? CGB_ATTR_TILES_BANK_0 : CGB_ATTR_TILES_BANK_1;
101 *new_attribs |= tile_flip_flags[f];
102 // log_debug(" * Tile Dedupe MATCH. new ID -> %d (dedupe count=%d), new_tile_id=%d, new_attribs=0x%02x, flip_index=%d\n", *new_tile_id, tile_count_deduped, *new_tile_id, *new_attribs, f);
103 return true;
104 }
105 }
106 }
107 return false; // No match found
108 }
109
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