ref: 0105779789909e2daad5aa09450dd3101aa5e723
dir: /src/gfx/main.cpp/
/*
* This file is part of RGBDS.
*
* Copyright (c) 2022, Eldred Habert and RGBDS contributors.
*
* SPDX-License-Identifier: MIT
*/
#include "gfx/main.hpp"
#include <algorithm>
#include <assert.h>
#include <cinttypes>
#include <cstdint>
#include <ctype.h>
#include <fstream>
#include <ios>
#include <limits>
#include <numeric>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <string_view>
#include "extern/getopt.h"
#include "platform.h"
#include "version.h"
#include "gfx/pal_spec.hpp"
#include "gfx/process.hpp"
#include "gfx/reverse.hpp"
using namespace std::literals::string_view_literals;
Options options;
char const *externalPalSpec = nullptr;
static uintmax_t nbErrors;
[[noreturn]] void giveUp() {
fprintf(stderr, "Conversion aborted after %ju error%s\n", nbErrors, nbErrors == 1 ? "" : "s");
exit(1);
}
void warning(char const *fmt, ...) {
va_list ap;
fputs("warning: ", stderr);
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
putc('\n', stderr);
}
void error(char const *fmt, ...) {
va_list ap;
fputs("error: ", stderr);
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
putc('\n', stderr);
if (nbErrors != std::numeric_limits<decltype(nbErrors)>::max())
nbErrors++;
}
[[noreturn]] void fatal(char const *fmt, ...) {
va_list ap;
fputs("FATAL: ", stderr);
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
putc('\n', stderr);
if (nbErrors != std::numeric_limits<decltype(nbErrors)>::max())
nbErrors++;
giveUp();
}
void Options::verbosePrint(uint8_t level, char const *fmt, ...) const {
if (verbosity >= level) {
va_list ap;
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
}
}
// Short options
static char const *optstring = "-Aa:b:Cc:Dd:FfhL:mN:n:o:Pp:Qq:r:s:Tt:U:uVvx:Z";
/*
* Equivalent long options
* Please keep in the same order as short opts
*
* Also, make sure long opts don't create ambiguity:
* A long opt's name should start with the same letter as its short opt,
* except if it doesn't create any ambiguity (`verbose` versus `version`).
* This is because long opt matching, even to a single char, is prioritized
* over short opt matching
*/
static struct option const longopts[] = {
{"output-attr-map", no_argument, NULL, 'A'},
{"attr-map", required_argument, NULL, 'a'},
{"base-tiles", required_argument, NULL, 'b'},
{"color-curve", no_argument, NULL, 'C'},
{"colors", required_argument, NULL, 'c'},
{"debug", no_argument, NULL, 'D'}, // Ignored
{"depth", required_argument, NULL, 'd'},
{"fix", no_argument, NULL, 'f'},
{"fix-and-save", no_argument, NULL, 'F'}, // Deprecated
{"horizontal", no_argument, NULL, 'h'}, // Deprecated
{"slice", required_argument, NULL, 'L'},
{"mirror-tiles", no_argument, NULL, 'm'},
{"nb-tiles", required_argument, NULL, 'N'},
{"nb-palettes", required_argument, NULL, 'n'},
{"output", required_argument, NULL, 'o'},
{"output-palette", no_argument, NULL, 'P'},
{"palette", required_argument, NULL, 'p'},
{"output-palette-map", no_argument, NULL, 'Q'},
{"palette-map", required_argument, NULL, 'q'},
{"reverse", required_argument, NULL, 'r'},
{"output-tilemap", no_argument, NULL, 'T'},
{"tilemap", required_argument, NULL, 't'},
{"unit-size", required_argument, NULL, 'U'},
{"unique-tiles", no_argument, NULL, 'u'},
{"version", no_argument, NULL, 'V'},
{"verbose", no_argument, NULL, 'v'},
{"trim-end", required_argument, NULL, 'x'},
{"columns", no_argument, NULL, 'Z'},
{NULL, no_argument, NULL, 0 }
};
static void printUsage(void) {
fputs("Usage: rgbgfx [-r stride] [-CmuVZ] [-v [-v ...]] [-a <attr_map> | -A]\n"
" [-b <base_ids>] [-c <colors>] [-d <depth>] [-L <slice>] [-N <nb_tiles>]\n"
" [-n <nb_pals>] [-o <out_file>] [-p <pal_file> | -P] [-q <pal_map> | -Q]\n"
" [-s <nb_colors>] [-t <tile_map> | -T] [-x <nb_tiles>] <file>\n"
"Useful options:\n"
" -m, --mirror-tiles optimize out mirrored tiles\n"
" -o, --output <path> output the tile data to this path\n"
" -t, --tilemap <path> output the tile map to this path\n"
" -u, --unique-tiles optimize out identical tiles\n"
" -V, --version print RGBGFX version and exit\n"
"\n"
"For help, use `man rgbgfx' or go to https://rgbds.gbdev.io/docs/\n",
stderr);
exit(1);
}
/**
* Parses a number at the beginning of a string, moving the pointer to skip the parsed characters
* Returns the provided errVal on error
*/
static uint16_t parseNumber(char *&string, char const *errPrefix, uint16_t errVal = UINT16_MAX) {
uint8_t base = 10;
if (*string == '\0') {
error("%s: expected number, but found nothing", errPrefix);
return errVal;
} else if (*string == '$') {
base = 16;
++string;
} else if (*string == '%') {
base = 2;
++string;
} else if (*string == '0' && string[1] != '\0') {
// Check if we have a "0x" or "0b" here
if (string[1] == 'x' || string[1] == 'X') {
base = 16;
string += 2;
} else if (string[1] == 'b' || string[1] == 'B') {
base = 2;
string += 2;
}
}
/**
* Turns a digit into its numeric value in the current base, if it has one.
* Maximum is inclusive. The string_view is modified to "consume" all digits.
* Returns 255 on parse failure (including wrong char for base), in which case
* the string_view may be pointing on garbage.
*/
auto charIndex = [&base](unsigned char c) -> uint8_t {
unsigned char index = c - '0'; // Use wrapping semantics
if (base == 2 && index >= 2) {
return 255;
} else if (index < 10) {
return index;
} else if (base != 16) {
return 255; // Letters are only valid in hex
}
index = tolower(c) - 'a'; // OK because we pass an `unsigned char`
if (index < 6) {
return index + 10;
}
return 255;
};
if (charIndex(*string) == 255) {
error("%s: expected digit%s, but found nothing", errPrefix,
base != 10 ? " after base" : "");
return errVal;
}
uint16_t number = 0;
do {
// Read a character, and check if it's valid in the given base
uint8_t index = charIndex(*string);
if (index == 255) {
break; // Found an invalid character, end
}
++string;
number *= base;
number += index;
// The lax check covers the addition on top of the multiplication
if (number >= UINT16_MAX / base) {
error("%s: the number is too large!", errPrefix);
return errVal;
}
} while (*string != '\0'); // No more characters?
return number;
}
static void skipWhitespace(char *&arg) {
arg += strspn(arg, " \t");
}
static void registerInput(char const *arg) {
if (!options.input.empty()) {
fprintf(stderr,
"FATAL: input image specified more than once! (first \"%s\", then "
"\"%s\")\n",
options.input.c_str(), arg);
printUsage();
exit(1);
} else if (arg[0] == '\0') { // Empty input path
fprintf(stderr, "FATAL: input image path cannot be empty!\n");
printUsage();
exit(1);
} else {
options.input = arg;
}
}
/**
* Turn an "at-file"'s contents into an argv that `getopt` can handle
* @param argPool Argument characters will be appended to this vector, for storage purposes.
*/
static std::vector<size_t> readAtFile(std::string const &path, std::vector<char> &argPool) {
std::filebuf file;
file.open(path, std::ios_base::in);
static_assert(decltype(file)::traits_type::eof() == EOF,
"isblank(char_traits<...>::eof()) is UB!");
std::vector<size_t> argvOfs;
for (;;) {
int c;
// First, discard any leading whitespace
do {
c = file.sbumpc();
if (c == EOF) {
return argvOfs;
}
} while (isblank(c));
switch (c) {
case '#': // If it's a comment, discard everything until EOL
while ((c = file.sbumpc()) != '\n') {
if (c == EOF) {
return argvOfs;
}
}
continue; // Start processing the next line
// If it's an empty line, ignore it
case '\r': // Assuming CRLF here
file.sbumpc(); // Discard the upcoming '\n'
[[fallthrough]];
case '\n':
continue; // Start processing the next line
}
// Alright, now we can parse the line
do {
// Read one argument (until the next whitespace char).
// We know there is one because we already have its first character in `c`.
argvOfs.push_back(argPool.size());
// Reading and appending characters one at a time may be inefficient, but I'm counting
// on `vector` and `sbumpc` to do the right thing here.
argPool.push_back(c); // Push the character we've already read
for (;;) {
c = file.sbumpc();
if (isblank(c) || c == '\n' || c == EOF) {
break;
} else if (c == '\r') {
file.sbumpc(); // Discard the '\n'
break;
}
argPool.push_back(c);
}
argPool.push_back('\0');
// Discard whitespace until the next argument (candidate)
while (isblank(c)) {
c = file.sbumpc();
}
if (c == '\r') {
c = file.sbumpc(); // Skip the '\n'
}
} while (c != '\n' && c != EOF); // End if we reached EOL
}
}
/**
* Parses an arg vector, modifying `options` as options are read.
* The three booleans are for the "auto path" flags, since their processing must be deferred to the
* end of option parsing.
*
* Returns NULL if the vector was fully parsed, or a pointer (which is part of the arg vector) to an
* "at-file" path if one is encountered.
*/
static char *parseArgv(int argc, char **argv, bool &autoAttrmap, bool &autoTilemap,
bool &autoPalettes, bool &autoPalmap) {
int opt;
while ((opt = musl_getopt_long_only(argc, argv, optstring, longopts, nullptr)) != -1) {
char *arg = musl_optarg; // Make a copy for scanning
switch (opt) {
case 'A':
autoAttrmap = true;
break;
case 'a':
autoAttrmap = false;
options.attrmap = musl_optarg;
break;
case 'b':
options.baseTileIDs[0] = parseNumber(arg, "Bank 0 base tile ID", 0);
if (options.baseTileIDs[0] >= 256) {
error("Bank 0 base tile ID must be below 256");
}
if (*arg == '\0') {
options.baseTileIDs[1] = 0;
break;
}
skipWhitespace(arg);
if (*arg != ',') {
error("Base tile IDs must be one or two comma-separated numbers, not \"%s\"",
musl_optarg);
break;
}
++arg; // Skip comma
skipWhitespace(arg);
options.baseTileIDs[1] = parseNumber(arg, "Bank 1 base tile ID", 0);
if (options.baseTileIDs[1] >= 256) {
error("Bank 1 base tile ID must be below 256");
}
if (*arg != '\0') {
error("Base tile IDs must be one or two comma-separated numbers, not \"%s\"",
musl_optarg);
break;
}
break;
case 'C':
options.useColorCurve = true;
break;
case 'c':
if (musl_optarg[0] == '#') {
options.palSpecType = Options::EXPLICIT;
parseInlinePalSpec(musl_optarg);
} else if (strcasecmp(musl_optarg, "embedded") == 0) {
// Use PLTE, error out if missing
options.palSpecType = Options::EMBEDDED;
} else {
options.palSpecType = Options::EXPLICIT;
// Can't parse the file yet, as "flat" color collections need to know the palette
// size to be split; thus, we defer that
// TODO: this does not validate the `fmt` part of any external spec but the last
// one, but I guess that's okay
externalPalSpec = musl_optarg;
}
break;
case 'd':
options.bitDepth = parseNumber(arg, "Bit depth", 2);
if (*arg != '\0') {
error("Bit depth (-b) argument must be a valid number, not \"%s\"", musl_optarg);
} else if (options.bitDepth != 1 && options.bitDepth != 2) {
error("Bit depth must be 1 or 2, not %" PRIu8);
options.bitDepth = 2;
}
break;
case 'L':
options.inputSlice.left = parseNumber(arg, "Input slice left coordinate");
if (options.inputSlice.left > INT16_MAX) {
error("Input slice left coordinate is out of range!");
break;
}
skipWhitespace(arg);
if (*arg != ',') {
error("Missing comma after left coordinate in \"%s\"", musl_optarg);
break;
}
++arg;
skipWhitespace(arg);
options.inputSlice.top = parseNumber(arg, "Input slice upper coordinate");
skipWhitespace(arg);
if (*arg != ':') {
error("Missing colon after upper coordinate in \"%s\"", musl_optarg);
break;
}
++arg;
skipWhitespace(arg);
options.inputSlice.width = parseNumber(arg, "Input slice width");
skipWhitespace(arg);
if (options.inputSlice.width == 0) {
error("Input slice width may not be 0!");
}
if (*arg != ',') {
error("Missing comma after width in \"%s\"", musl_optarg);
break;
}
++arg;
skipWhitespace(arg);
options.inputSlice.height = parseNumber(arg, "Input slice height");
if (options.inputSlice.height == 0) {
error("Input slice height may not be 0!");
}
if (*arg != '\0') {
error("Unexpected extra characters after slice spec in \"%s\"", musl_optarg);
}
break;
case 'm':
options.allowMirroring = true;
[[fallthrough]]; // Imply `-u`
case 'u':
options.allowDedup = true;
break;
case 'N':
options.maxNbTiles[0] = parseNumber(arg, "Number of tiles in bank 0", 256);
if (options.maxNbTiles[0] > 256) {
error("Bank 0 cannot contain more than 256 tiles");
}
if (*arg == '\0') {
options.maxNbTiles[1] = 0;
break;
}
skipWhitespace(arg);
if (*arg != ',') {
error("Bank capacity must be one or two comma-separated numbers, not \"%s\"",
musl_optarg);
break;
}
++arg; // Skip comma
skipWhitespace(arg);
options.maxNbTiles[1] = parseNumber(arg, "Number of tiles in bank 1", 256);
if (options.maxNbTiles[1] > 256) {
error("Bank 1 cannot contain more than 256 tiles");
}
if (*arg != '\0') {
error("Bank capacity must be one or two comma-separated numbers, not \"%s\"",
musl_optarg);
break;
}
break;
case 'n':
options.nbPalettes = parseNumber(arg, "Number of palettes", 256);
if (*arg != '\0') {
error("Number of palettes (-n) must be a valid number, not \"%s\"", musl_optarg);
}
if (options.nbPalettes > 256) {
error("Number of palettes (-n) must not exceed 256!");
} else if (options.nbPalettes == 0) {
error("Number of palettes (-n) may not be 0!");
}
break;
case 'o':
options.output = musl_optarg;
break;
case 'P':
autoPalettes = true;
break;
case 'p':
autoPalettes = false;
options.palettes = musl_optarg;
break;
case 'Q':
autoPalmap = true;
break;
case 'q':
autoPalmap = false;
options.palmap = musl_optarg;
break;
case 'r':
options.reversedWidth = parseNumber(arg, "Reversed image stride");
if (*arg != '\0') {
error("Reversed image stride (-r) must be a valid number, not \"%s\"", musl_optarg);
}
if (options.reversedWidth == 0) {
error("Reversed image stride (-r) may not be 0!");
}
break;
case 's':
options.nbColorsPerPal = parseNumber(arg, "Number of colors per palette", 4);
if (*arg != '\0') {
error("Palette size (-s) must be a valid number, not \"%s\"", musl_optarg);
}
if (options.nbColorsPerPal > 4) {
error("Palette size (-s) must not exceed 4!");
} else if (options.nbColorsPerPal == 0) {
error("Palette size (-s) may not be 0!");
}
break;
case 'T':
autoTilemap = true;
break;
case 't':
autoTilemap = false;
options.tilemap = musl_optarg;
break;
case 'V':
printf("rgbgfx %s\n", get_package_version_string());
exit(0);
case 'v':
if (options.verbosity < Options::VERB_VVVVVV) {
++options.verbosity;
}
break;
case 'x':
options.trim = parseNumber(arg, "Number of tiles to trim", 0);
if (*arg != '\0') {
error("Tile trim (-x) argument must be a valid number, not \"%s\"", musl_optarg);
}
break;
case 'h':
warning("`-h` is deprecated, use `-Z` instead");
[[fallthrough]];
case 'Z':
options.columnMajor = true;
break;
case 1: // Positional argument, requested by leading `-` in opt string
if (musl_optarg[0] == '@') {
// Instruct the caller to process that at-file
return &musl_optarg[1];
} else {
registerInput(musl_optarg);
}
break;
case 'D':
case 'F':
case 'f':
warning("Ignoring retired option `-%c`", opt);
break;
default:
printUsage();
exit(1);
}
}
return nullptr; // Done processing this argv
}
int main(int argc, char *argv[]) {
bool autoAttrmap = false, autoTilemap = false, autoPalettes = false, autoPalmap = false;
struct AtFileStackEntry {
int parentInd; // Saved offset into parent argv
std::vector<char *> argv; // This context's arg pointer vec
std::vector<char> argPool;
AtFileStackEntry(int parentInd_, std::vector<char *> argv_)
: parentInd(parentInd_), argv(argv_) {}
};
std::vector<AtFileStackEntry> atFileStack;
int curArgc = argc;
char **curArgv = argv;
for (;;) {
char *atFileName =
parseArgv(curArgc, curArgv, autoAttrmap, autoTilemap, autoPalettes, autoPalmap);
if (atFileName) {
// Copy `argv[0]` for error reporting, and because option parsing skips it
AtFileStackEntry &stackEntry =
atFileStack.emplace_back(musl_optind, std::vector{atFileName});
// It would be nice to compute the char pointers on the fly, but reallocs don't allow
// that; so we must compute the offsets after the pool is fixed
auto offsets = readAtFile(&musl_optarg[1], stackEntry.argPool);
stackEntry.argv.reserve(offsets.size() + 2); // Avoid a bunch of reallocs
for (size_t ofs : offsets) {
stackEntry.argv.push_back(&stackEntry.argPool.data()[ofs]);
}
stackEntry.argv.push_back(nullptr); // Don't forget the arg vector terminator!
curArgc = stackEntry.argv.size() - 1;
curArgv = stackEntry.argv.data();
musl_optind = 1; // Don't use 0 because we're not scanning a different argv per se
continue; // Begin scanning that arg vector
}
if (musl_optind != curArgc) {
// This happens if `--` is passed, process the remaining arg(s) as positional
assert(musl_optind < curArgc);
for (int i = musl_optind; i < curArgc; ++i) {
registerInput(argv[i]);
}
}
// Pop off the top stack entry, or end parsing if none
if (atFileStack.empty()) {
break;
}
// OK to restore `optind` directly, because `optpos` must be 0 right now.
// (Providing 0 would be a "proper" reset, but we want to resume parsing)
musl_optind = atFileStack.back().parentInd;
atFileStack.pop_back();
if (atFileStack.empty()) {
curArgc = argc;
curArgv = argv;
} else {
auto &vec = atFileStack.back().argv;
curArgc = vec.size();
curArgv = vec.data();
}
}
if (options.nbColorsPerPal == 0) {
options.nbColorsPerPal = 1u << options.bitDepth;
} else if (options.nbColorsPerPal > 1u << options.bitDepth) {
error("%" PRIu8 "bpp palettes can only contain %u colors, not %" PRIu8, options.bitDepth,
1u << options.bitDepth, options.nbColorsPerPal);
}
auto autoOutPath = [](bool autoOptEnabled, std::string &path, char const *extension) {
if (autoOptEnabled) {
constexpr std::string_view chars =
// Both must start with a dot!
#if defined(_MSC_VER) || defined(__MINGW32__)
"./\\"sv;
#else
"./"sv;
#endif
size_t len = options.input.npos;
size_t i = options.input.find_last_of(chars);
if (i != options.input.npos && options.input[i] == '.') {
// We found the last dot, but check if it's part of a stem
// (There must be a non-path separator character before it)
if (i != 0 && chars.find(options.input[i - 1], 1) == chars.npos) {
// We can replace the extension
len = i;
}
}
path.assign(options.input, 0, len);
path.append(extension);
}
};
autoOutPath(autoAttrmap, options.attrmap, ".attrmap");
autoOutPath(autoTilemap, options.tilemap, ".tilemap");
autoOutPath(autoPalettes, options.palettes, ".pal");
autoOutPath(autoPalmap, options.palmap, ".palmap");
// Execute deferred external pal spec parsing, now that all other params are known
if (externalPalSpec) {
parseExternalPalSpec(externalPalSpec);
}
if (options.verbosity >= Options::VERB_CFG) {
fprintf(stderr, "rgbgfx %s\n", get_package_version_string());
if (options.verbosity >= Options::VERB_VVVVVV) {
fputc('\n', stderr);
static std::array<uint16_t, 21> gfx{
0x1FE, 0x3FF, 0x399, 0x399, 0x3FF, 0x3FF, 0x381, 0x3C3, 0x1FE, 0x078, 0x1FE,
0x3FF, 0x3FF, 0x3FF, 0x37B, 0x37B, 0x0FC, 0x0CC, 0x1CE, 0x1CE, 0x1CE,
};
static std::array<char const *, 3> textbox{
" ,----------------------------------------.",
" | Augh, dimensional interference again?! |",
" `----------------------------------------'"};
for (size_t i = 0; i < gfx.size(); ++i) {
uint16_t row = gfx[i];
for (uint8_t _ = 0; _ < 10; ++_) {
unsigned char c = row & 1 ? '0' : ' ';
fputc(c, stderr);
// Double the pixel horizontally, otherwise the aspect ratio looks wrong
fputc(c, stderr);
row >>= 1;
}
if (i < textbox.size()) {
fputs(textbox[i], stderr);
}
fputc('\n', stderr);
}
fputc('\n', stderr);
}
fputs("Options:\n", stderr);
if (options.columnMajor)
fputs("\tVisit image in column-major order\n", stderr);
if (options.allowMirroring)
fputs("\tAllow mirroring tiles\n", stderr);
if (options.allowDedup)
fputs("\tAllow deduplicating tiles\n", stderr);
if (options.useColorCurve)
fputs("\tUse color curve\n", stderr);
fprintf(stderr, "\tBit depth: %" PRIu8 "bpp\n", options.bitDepth);
if (options.trim != 0)
fprintf(stderr, "\tTrim the last %" PRIu64 " tiles\n", options.trim);
fprintf(stderr, "\tMaximum %" PRIu8 " palettes\n", options.nbPalettes);
fprintf(stderr, "\tPalettes contain %" PRIu8 " colors\n", options.nbColorsPerPal);
fprintf(stderr, "\t%s palette spec\n", []() {
switch (options.palSpecType) {
case Options::NO_SPEC:
return "No";
case Options::EXPLICIT:
return "Explicit";
case Options::EMBEDDED:
return "Embedded";
}
return "???";
}());
if (options.palSpecType == Options::EXPLICIT) {
fputs("\t[\n", stderr);
for (std::array<Rgba, 4> const &pal : options.palSpec) {
fprintf(stderr, "\t\t#%06x, #%06x, #%06x, #%06x,\n", pal[0].toCSS() >> 8,
pal[1].toCSS() >> 8, pal[2].toCSS() >> 8, pal[3].toCSS() >> 8);
}
fputs("\t]\n", stderr);
}
fprintf(stderr,
"\tInput image slice: %" PRIu32 "x%" PRIu32 " pixels starting at (%" PRIi32
", %" PRIi32 ")\n",
options.inputSlice.width, options.inputSlice.height, options.inputSlice.left,
options.inputSlice.top);
fprintf(stderr, "\tBase tile IDs: [%" PRIu8 ", %" PRIu8 "]\n", options.baseTileIDs[0],
options.baseTileIDs[1]);
fprintf(stderr, "\tMaximum %" PRIu16 " tiles in bank 0, %" PRIu16 " in bank 1\n",
options.maxNbTiles[0], options.maxNbTiles[1]);
auto printPath = [](char const *name, std::string const &path) {
if (!path.empty()) {
fprintf(stderr, "\t%s: %s\n", name, path.c_str());
}
};
printPath("Input image", options.input);
printPath("Output tile data", options.output);
printPath("Output tilemap", options.tilemap);
printPath("Output attrmap", options.attrmap);
printPath("Output palettes", options.palettes);
fputs("Ready.\n", stderr);
}
if (options.input.empty()) {
fatal("No input image specified");
}
// Do not do anything if option parsing went wrong
if (nbErrors) {
giveUp();
}
if (options.reverse()) {
reverse();
} else {
process();
}
if (nbErrors) {
giveUp();
}
return 0;
}
void Palette::addColor(uint16_t color) {
for (size_t i = 0; true; ++i) {
assert(i < colors.size()); // The packing should guarantee this
if (colors[i] == color) { // The color is already present
break;
} else if (colors[i] == UINT16_MAX) { // Empty slot
colors[i] = color;
break;
}
}
}
/**
* Returns the ID of the color in the palette, or `size()` if the color is not in
*/
uint8_t Palette::indexOf(uint16_t color) const {
return std::find(colors.begin(), colors.end(), color) - colors.begin();
}
auto Palette::begin() -> decltype(colors)::iterator {
// Skip the first slot if reserved for transparency
return colors.begin() + options.hasTransparentPixels;
}
auto Palette::end() -> decltype(colors)::iterator {
return std::find(begin(), colors.end(), UINT16_MAX);
}
auto Palette::begin() const -> decltype(colors)::const_iterator {
// Skip the first slot if reserved for transparency
return colors.begin() + options.hasTransparentPixels;
}
auto Palette::end() const -> decltype(colors)::const_iterator {
return std::find(begin(), colors.end(), UINT16_MAX);
}
uint8_t Palette::size() const {
return indexOf(UINT16_MAX);
}