💿🐜 Antkeeper source code
https://antkeeper.com
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
141 lines
3.4 KiB
141 lines
3.4 KiB
/*
|
|
* Copyright (C) 2021 Christopher J. Howard
|
|
*
|
|
* This file is part of Antkeeper source code.
|
|
*
|
|
* Antkeeper source code is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* Antkeeper source code is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with Antkeeper source code. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include "image.hpp"
|
|
#include <cstring>
|
|
#include <stdexcept>
|
|
|
|
image::image(const image& source)
|
|
{
|
|
*this = source;
|
|
}
|
|
|
|
image::image():
|
|
width(0),
|
|
height(0),
|
|
component_size(0),
|
|
channel_count(0),
|
|
pixel_size(0),
|
|
pixels(nullptr),
|
|
size(0)
|
|
{}
|
|
|
|
image::~image()
|
|
{
|
|
free_pixels();
|
|
}
|
|
|
|
image& image::operator=(const image& source)
|
|
{
|
|
format(source.component_size, source.channel_count);
|
|
resize(source.width, source.height);
|
|
std::memcpy(pixels, source.pixels, size);
|
|
|
|
return *this;
|
|
}
|
|
|
|
bool image::compatible(const image& other) const
|
|
{
|
|
return (other.component_size == component_size && other.channel_count == channel_count);
|
|
}
|
|
|
|
void image::copy(const image& source, unsigned int w, unsigned int h, unsigned int from_x, int unsigned from_y, unsigned int to_x, unsigned int to_y)
|
|
{
|
|
if (!compatible(source))
|
|
{
|
|
throw std::runtime_error("Cannot copy image with mismatched format");
|
|
}
|
|
|
|
const unsigned char* from_pixels = static_cast<const unsigned char*>(source.pixels);
|
|
unsigned char* to_pixels = static_cast<unsigned char*>(pixels);
|
|
|
|
for (unsigned int i = 0; i < h; ++i)
|
|
{
|
|
// Calculate vertical pixel offset
|
|
unsigned int from_i = from_y + i;
|
|
unsigned int to_i = to_y + i;
|
|
|
|
// Bounds check
|
|
if (from_i >= source.height || to_i >= height)
|
|
break;
|
|
|
|
for (unsigned int j = 0; j < w; ++j)
|
|
{
|
|
// Calculate horizontal pixel offsets
|
|
unsigned int from_j = from_x + j;
|
|
unsigned int to_j = to_x + j;
|
|
|
|
// Bounds check
|
|
if (from_j >= source.width || to_j >= width)
|
|
continue;
|
|
|
|
// Calculate pixel data offset (in bytes)
|
|
std::size_t from_offset = (from_i * source.width + from_j) * pixel_size;
|
|
std::size_t to_offset = (to_i * width + to_j) * pixel_size;
|
|
|
|
// Copy single pixel
|
|
std::memcpy(to_pixels + to_offset, from_pixels + from_offset, pixel_size);
|
|
}
|
|
}
|
|
}
|
|
|
|
void image::format(std::size_t component_size, std::size_t channel_count)
|
|
{
|
|
if (this->component_size == component_size && this->channel_count == channel_count)
|
|
return;
|
|
|
|
free_pixels();
|
|
this->component_size = component_size;
|
|
this->channel_count = channel_count;
|
|
pixel_size = component_size * channel_count;
|
|
size = width * height * pixel_size;
|
|
allocate_pixels();
|
|
}
|
|
|
|
void image::resize(unsigned int width, unsigned int height)
|
|
{
|
|
if (this->width == width && this->height == height)
|
|
{
|
|
return;
|
|
}
|
|
|
|
free_pixels();
|
|
this->width = width;
|
|
this->height = height;
|
|
size = width * height * pixel_size;
|
|
allocate_pixels();
|
|
}
|
|
|
|
void image::allocate_pixels()
|
|
{
|
|
if (size != 0)
|
|
{
|
|
pixels = new unsigned char[size];
|
|
}
|
|
}
|
|
|
|
void image::free_pixels()
|
|
{
|
|
if (pixels != nullptr)
|
|
{
|
|
delete[] reinterpret_cast<unsigned char*>(pixels);
|
|
pixels = nullptr;
|
|
size = 0;
|
|
}
|
|
}
|