ref: 38a372f25f3a44b127cad45e5299743a15503f6c
dir: /src/gfx/gb.c/
/* * This file is part of RGBDS. * * Copyright (c) 2013-2018, stag019 and RGBDS contributors. * * SPDX-License-Identifier: MIT */ #include <stdint.h> #include <stdio.h> #include <stdlib.h> #include "gfx/main.h" void transpose_tiles(struct GBImage *gb, int width) { uint8_t *newdata; int i; int newbyte; newdata = calloc(gb->size, 1); for (i = 0; i < gb->size; i++) { newbyte = i / (8 * depth) * width * 8 * depth; newbyte = newbyte % gb->size + 8 * depth * (newbyte / gb->size) + i % (8 * depth); newdata[newbyte] = gb->data[i]; } free(gb->data); gb->data = newdata; } void raw_to_gb(const struct RawIndexedImage *raw_image, struct GBImage *gb) { int x, y, byte; uint8_t index; for (y = 0; y < raw_image->height; y++) { for (x = 0; x < raw_image->width; x++) { index = raw_image->data[y][x]; index &= (1 << depth) - 1; byte = y * depth + x / 8 * raw_image->height / 8 * 8 * depth; gb->data[byte] |= (index & 1) << (7 - x % 8); if (depth == 2) { gb->data[byte + 1] |= (index >> 1) << (7 - x % 8); } } } if (!gb->horizontal) transpose_tiles(gb, raw_image->width / 8); } void output_file(const struct Options *opts, const struct GBImage *gb) { FILE *f; f = fopen(opts->outfile, "wb"); if (!f) err(1, "Opening output file '%s' failed", opts->outfile); fwrite(gb->data, 1, gb->size - gb->trim * 8 * depth, f); fclose(f); } int get_tile_index(uint8_t *tile, uint8_t **tiles, int num_tiles, int tile_size) { int i, j; for (i = 0; i < num_tiles; i++) { for (j = 0; j < tile_size; j++) { if (tile[j] != tiles[i][j]) break; } if (j >= tile_size) return i; } return -1; } uint8_t reverse_bits(uint8_t b) { uint8_t rev = 0; rev |= (b & 0x80) >> 7; rev |= (b & 0x40) >> 5; rev |= (b & 0x20) >> 3; rev |= (b & 0x10) >> 1; rev |= (b & 0x08) << 1; rev |= (b & 0x04) << 3; rev |= (b & 0x02) << 5; rev |= (b & 0x01) << 7; return rev; } void xflip(uint8_t *tile, uint8_t *tile_xflip, int tile_size) { int i; for (i = 0; i < tile_size; i++) tile_xflip[i] = reverse_bits(tile[i]); } void yflip(uint8_t *tile, uint8_t *tile_yflip, int tile_size) { int i; for (i = 0; i < tile_size; i++) tile_yflip[i] = tile[(tile_size - i - 1) ^ (depth - 1)]; } /* * get_mirrored_tile_index looks for `tile` in tile array `tiles`, also * checking x-, y-, and xy-mirrored versions of `tile`. If one is found, * `*flags` is set according to the type of mirroring and the index of the * matched tile is returned. If no match is found, -1 is returned. */ int get_mirrored_tile_index(uint8_t *tile, uint8_t **tiles, int num_tiles, int tile_size, int *flags) { int index; uint8_t *tile_xflip; uint8_t *tile_yflip; index = get_tile_index(tile, tiles, num_tiles, tile_size); if (index >= 0) { *flags = 0; return index; } tile_yflip = malloc(tile_size); yflip(tile, tile_yflip, tile_size); index = get_tile_index(tile_yflip, tiles, num_tiles, tile_size); if (index >= 0) { *flags = YFLIP; free(tile_yflip); return index; } tile_xflip = malloc(tile_size); xflip(tile, tile_xflip, tile_size); index = get_tile_index(tile_xflip, tiles, num_tiles, tile_size); if (index >= 0) { *flags = XFLIP; free(tile_yflip); free(tile_xflip); return index; } yflip(tile_xflip, tile_yflip, tile_size); index = get_tile_index(tile_yflip, tiles, num_tiles, tile_size); if (index >= 0) *flags = XFLIP | YFLIP; free(tile_yflip); free(tile_xflip); return index; } void create_mapfiles(const struct Options *opts, struct GBImage *gb, struct Mapfile *tilemap, struct Mapfile *attrmap) { int i, j; int gb_i; int tile_size; int max_tiles; int num_tiles; int index; int flags; int gb_size; uint8_t *tile; uint8_t **tiles; tile_size = sizeof(uint8_t) * depth * 8; gb_size = gb->size - (gb->trim * tile_size); max_tiles = gb_size / tile_size; /* If the input image doesn't fill the last tile, increase the count. */ if (gb_size > max_tiles * tile_size) max_tiles++; tiles = calloc(max_tiles, sizeof(uint8_t *)); num_tiles = 0; if (*opts->tilemapfile) { tilemap->data = calloc(max_tiles, sizeof(uint8_t)); tilemap->size = 0; } if (*opts->attrmapfile) { attrmap->data = calloc(max_tiles, sizeof(uint8_t)); attrmap->size = 0; } gb_i = 0; while (gb_i < gb_size) { flags = 0; tile = malloc(tile_size); for (i = 0; i < tile_size; i++) { tile[i] = gb->data[gb_i]; gb_i++; } if (opts->unique) { if (opts->mirror) { index = get_mirrored_tile_index(tile, tiles, num_tiles, tile_size, &flags); } else { index = get_tile_index(tile, tiles, num_tiles, tile_size); } if (index < 0) { index = num_tiles; tiles[num_tiles] = tile; num_tiles++; } } else { index = num_tiles; tiles[num_tiles] = tile; num_tiles++; } if (*opts->tilemapfile) { tilemap->data[tilemap->size] = index; tilemap->size++; } if (*opts->attrmapfile) { attrmap->data[attrmap->size] = flags; attrmap->size++; } } if (opts->unique) { free(gb->data); gb->data = malloc(tile_size * num_tiles); for (i = 0; i < num_tiles; i++) { tile = tiles[i]; for (j = 0; j < tile_size; j++) gb->data[i * tile_size + j] = tile[j]; } gb->size = i * tile_size; } for (i = 0; i < num_tiles; i++) free(tiles[i]); free(tiles); } void output_tilemap_file(const struct Options *opts, const struct Mapfile *tilemap) { FILE *f; f = fopen(opts->tilemapfile, "wb"); if (!f) err(1, "Opening tilemap file '%s' failed", opts->tilemapfile); fwrite(tilemap->data, 1, tilemap->size, f); fclose(f); if (opts->tilemapout) free(opts->tilemapfile); } void output_attrmap_file(const struct Options *opts, const struct Mapfile *attrmap) { FILE *f; f = fopen(opts->attrmapfile, "wb"); if (!f) err(1, "Opening attrmap file '%s' failed", opts->attrmapfile); fwrite(attrmap->data, 1, attrmap->size, f); fclose(f); if (opts->attrmapout) free(opts->attrmapfile); } /* * based on the Gaussian-like curve used by SameBoy since commit * 65dd02cc52f531dbbd3a7e6014e99d5b24e71a4c (Oct 2017) * with ties resolved by comparing the difference of the squares. */ static int reverse_curve[] = { 0, 0, 1, 1, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 23, 23, 23, 23, 23, 23, 23, 23, 23, 24, 24, 24, 24, 24, 24, 24, 24, 25, 25, 25, 25, 25, 25, 25, 25, 26, 26, 26, 26, 26, 26, 26, 27, 27, 27, 27, 27, 28, 28, 28, 28, 29, 29, 29, 30, 30, 31, }; void output_palette_file(const struct Options *opts, const struct RawIndexedImage *raw_image) { FILE *f; int i, color; uint8_t cur_bytes[2]; f = fopen(opts->palfile, "wb"); if (!f) err(1, "Opening palette file '%s' failed", opts->palfile); for (i = 0; i < raw_image->num_colors; i++) { int r = raw_image->palette[i].red; int g = raw_image->palette[i].green; int b = raw_image->palette[i].blue; if (opts->colorcurve) { g = (g * 4 - b) / 3; if (g < 0) g = 0; r = reverse_curve[r]; g = reverse_curve[g]; b = reverse_curve[b]; } else { r >>= 3; g >>= 3; b >>= 3; } color = b << 10 | g << 5 | r; cur_bytes[0] = color & 0xFF; cur_bytes[1] = color >> 8; fwrite(cur_bytes, 2, 1, f); } fclose(f); if (opts->palout) free(opts->palfile); }