godot/scene/resources/bit_mask.cpp

196 lines
5.8 KiB
C++

/*************************************************************************/
/* bit_mask.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 "bit_mask.h"
#include "io/image_loader.h"
void BitMap::create(const Size2 &p_size) {
ERR_FAIL_COND(p_size.width < 1);
ERR_FAIL_COND(p_size.height < 1);
width = p_size.width;
height = p_size.height;
bitmask.resize(((width * height) / 8) + 1);
zeromem(bitmask.ptr(), bitmask.size());
}
void BitMap::create_from_image_alpha(const Ref<Image> &p_image) {
ERR_FAIL_COND(p_image.is_null() || p_image->empty());
Ref<Image> img = p_image->duplicate();
img->convert(Image::FORMAT_LA8);
ERR_FAIL_COND(img->get_format() != Image::FORMAT_LA8);
create(Size2(img->get_width(), img->get_height()));
PoolVector<uint8_t>::Read r = img->get_data().read();
uint8_t *w = bitmask.ptr();
for (int i = 0; i < width * height; i++) {
int bbyte = i / 8;
int bbit = i % 8;
if (r[i * 2])
w[bbyte] |= (1 << bbit);
}
}
void BitMap::set_bit_rect(const Rect2 &p_rect, bool p_value) {
Rect2i current = Rect2i(0, 0, width, height).clip(p_rect);
uint8_t *data = bitmask.ptr();
for (int i = current.pos.x; i < current.pos.x + current.size.x; i++) {
for (int j = current.pos.y; j < current.pos.y + current.size.y; j++) {
int ofs = width * j + i;
int bbyte = ofs / 8;
int bbit = ofs % 8;
uint8_t b = data[bbyte];
if (p_value)
b |= (1 << bbit);
else
b &= !(1 << bbit);
data[bbyte] = b;
}
}
}
int BitMap::get_true_bit_count() const {
int ds = bitmask.size();
const uint8_t *d = bitmask.ptr();
int c = 0;
//fast, almot branchless version
for (int i = 0; i < ds; i++) {
c += (d[i] & (1 << 7)) >> 7;
c += (d[i] & (1 << 6)) >> 6;
c += (d[i] & (1 << 5)) >> 5;
c += (d[i] & (1 << 4)) >> 4;
c += (d[i] & (1 << 3)) >> 3;
c += (d[i] & (1 << 2)) >> 2;
c += d[i] & 1;
}
return c;
}
void BitMap::set_bit(const Point2 &p_pos, bool p_value) {
int x = Math::fast_ftoi(p_pos.x);
int y = Math::fast_ftoi(p_pos.y);
ERR_FAIL_INDEX(x, width);
ERR_FAIL_INDEX(y, height);
int ofs = width * y + x;
int bbyte = ofs / 8;
int bbit = ofs % 8;
uint8_t b = bitmask[bbyte];
if (p_value)
b |= (1 << bbit);
else
b &= !(1 << bbit);
bitmask[bbyte] = b;
}
bool BitMap::get_bit(const Point2 &p_pos) const {
int x = Math::fast_ftoi(p_pos.x);
int y = Math::fast_ftoi(p_pos.y);
ERR_FAIL_INDEX_V(x, width, false);
ERR_FAIL_INDEX_V(y, height, false);
int ofs = width * y + x;
int bbyte = ofs / 8;
int bbit = ofs % 8;
return (bitmask[bbyte] & (1 << bbit)) != 0;
}
Size2 BitMap::get_size() const {
return Size2(width, height);
}
void BitMap::_set_data(const Dictionary &p_d) {
ERR_FAIL_COND(!p_d.has("size"));
ERR_FAIL_COND(!p_d.has("data"));
create(p_d["size"]);
bitmask = p_d["data"];
}
Dictionary BitMap::_get_data() const {
Dictionary d;
d["size"] = get_size();
d["data"] = bitmask;
return d;
}
void BitMap::_bind_methods() {
ClassDB::bind_method(D_METHOD("create", "size"), &BitMap::create);
ClassDB::bind_method(D_METHOD("create_from_image_alpha", "image"), &BitMap::create_from_image_alpha);
ClassDB::bind_method(D_METHOD("set_bit", "pos", "bit"), &BitMap::set_bit);
ClassDB::bind_method(D_METHOD("get_bit", "pos"), &BitMap::get_bit);
ClassDB::bind_method(D_METHOD("set_bit_rect", "p_rect", "bit"), &BitMap::set_bit_rect);
ClassDB::bind_method(D_METHOD("get_true_bit_count"), &BitMap::get_true_bit_count);
ClassDB::bind_method(D_METHOD("get_size"), &BitMap::get_size);
ClassDB::bind_method(D_METHOD("_set_data"), &BitMap::_set_data);
ClassDB::bind_method(D_METHOD("_get_data"), &BitMap::_get_data);
ADD_PROPERTY(PropertyInfo(Variant::DICTIONARY, "data", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NOEDITOR), "_set_data", "_get_data");
}
BitMap::BitMap() {
width = 0;
height = 0;
}
//////////////////////////////////////