godot/modules/pbm/bitmap_loader_pbm.cpp
2017-04-08 00:11:42 +02:00

234 lines
6.1 KiB
C++

/*************************************************************************/
/* bitmap_loader_pbm.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* http://www.godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2017 Godot Engine contributors (cf. AUTHORS.md) */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/*************************************************************************/
#include "bitmap_loader_pbm.h"
#include "os/file_access.h"
#include "scene/resources/bit_mask.h"
static bool _get_token(FileAccessRef &f, uint8_t &saved, PoolVector<uint8_t> &r_token, bool p_binary = false, bool p_single_chunk = false) {
int token_max = r_token.size();
PoolVector<uint8_t>::Write w;
if (token_max)
w = r_token.write();
int ofs = 0;
bool lf = false;
while (true) {
uint8_t b;
if (saved) {
b = saved;
saved = 0;
} else {
b = f->get_8();
}
if (f->eof_reached()) {
if (ofs) {
w = PoolVector<uint8_t>::Write();
r_token.resize(ofs);
return true;
} else {
return false;
}
}
if (!ofs && !p_binary && b == '#') {
//skip comment
while (b != '\n') {
if (f->eof_reached()) {
return false;
}
b = f->get_8();
}
lf = true;
} else if (b <= 32 && !(p_binary && (ofs || lf))) {
if (b == '\n') {
lf = true;
}
if (ofs && !p_single_chunk) {
w = PoolVector<uint8_t>::Write();
r_token.resize(ofs);
saved = b;
return true;
}
} else {
bool resized = false;
while (ofs >= token_max) {
if (token_max)
token_max <<= 1;
else
token_max = 1;
resized = true;
}
if (resized) {
w = PoolVector<uint8_t>::Write();
r_token.resize(token_max);
w = r_token.write();
}
w[ofs++] = b;
}
}
return false;
}
static int _get_number_from_token(PoolVector<uint8_t> &r_token) {
int len = r_token.size();
PoolVector<uint8_t>::Read r = r_token.read();
return String::to_int((const char *)r.ptr(), len);
}
RES ResourceFormatPBM::load(const String &p_path, const String &p_original_path, Error *r_error) {
#define _RETURN(m_err) \
{ \
if (r_error) \
*r_error = m_err; \
ERR_FAIL_V(RES()); \
}
FileAccessRef f = FileAccess::open(p_path, FileAccess::READ);
uint8_t saved = 0;
if (!f)
_RETURN(ERR_CANT_OPEN);
PoolVector<uint8_t> token;
if (!_get_token(f, saved, token)) {
_RETURN(ERR_PARSE_ERROR);
}
if (token.size() != 2) {
_RETURN(ERR_FILE_CORRUPT);
}
if (token[0] != 'P') {
_RETURN(ERR_FILE_CORRUPT);
}
if (token[1] != '1' && token[1] != '4') {
_RETURN(ERR_FILE_CORRUPT);
}
bool bits = token[1] == '4';
if (!_get_token(f, saved, token)) {
_RETURN(ERR_PARSE_ERROR);
}
int width = _get_number_from_token(token);
if (width <= 0) {
_RETURN(ERR_FILE_CORRUPT);
}
if (!_get_token(f, saved, token)) {
_RETURN(ERR_PARSE_ERROR);
}
int height = _get_number_from_token(token);
if (height <= 0) {
_RETURN(ERR_FILE_CORRUPT);
}
Ref<BitMap> bm;
bm.instance();
bm->create(Size2i(width, height));
if (!bits) {
int required_bytes = width * height;
if (!_get_token(f, saved, token, false, true)) {
_RETURN(ERR_PARSE_ERROR);
}
if (token.size() < required_bytes) {
_RETURN(ERR_FILE_CORRUPT);
}
PoolVector<uint8_t>::Read r = token.read();
for (int i = 0; i < height; i++) {
for (int j = 0; j < width; j++) {
char num = r[i * width + j];
bm->set_bit(Point2i(j, i), num == '0');
}
}
} else {
//a single, entire token of bits!
if (!_get_token(f, saved, token, true)) {
_RETURN(ERR_PARSE_ERROR);
}
int required_bytes = Math::ceil((width * height) / 8.0);
if (token.size() < required_bytes) {
_RETURN(ERR_FILE_CORRUPT);
}
PoolVector<uint8_t>::Read r = token.read();
int bitwidth = width;
if (bitwidth % 8)
bitwidth += 8 - (bitwidth % 8);
for (int i = 0; i < height; i++) {
for (int j = 0; j < width; j++) {
int ofs = bitwidth * i + j;
uint8_t byte = r[ofs / 8];
bool bit = (byte >> (7 - (ofs % 8))) & 1;
bm->set_bit(Point2i(j, i), !bit);
}
}
}
return bm;
}
void ResourceFormatPBM::get_recognized_extensions(List<String> *p_extensions) const {
p_extensions->push_back("pbm");
}
bool ResourceFormatPBM::handles_type(const String &p_type) const {
return p_type == "BitMap";
}
String ResourceFormatPBM::get_resource_type(const String &p_path) const {
if (p_path.get_extension().to_lower() == "pbm")
return "BitMap";
return "";
}