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/*
render/image.cc
This file is part of the Osirion project and is distributed under
the terms of the GNU General Public License version 2
*/
#include <stdlib.h>
#include <string.h>
#include "render/image.h"
namespace render
{
Image::Image(unsigned int width, unsigned int height, unsigned int channels)
{
image_width = width;
image_height = height;
image_channels = channels;
image_data = (unsigned char *) malloc(size());
clear();
}
Image::~Image()
{
free(image_data);
}
void Image::clear()
{
memset(image_data, 0, size());
}
void Image::swap_channels()
{
for (size_t y = 0; y < image_height; y++) {
for (size_t x = 0; x < image_width; x++) {
size_t offset = y * image_width * image_channels + x * image_channels;
unsigned char tmp = image_data[offset];
image_data[offset] = image_data[offset + 2];
image_data[offset + 2] = tmp;
}
}
}
void Image::pad()
{
unsigned int w = width();
unsigned int h = height();
if ((w % 8) != 0) {
image_width = w + (8 - (w % 8));
}
if ((w % 8) != 0) {
image_height = h + (8 - (h % 8));
}
unsigned char *image_new = (unsigned char *) malloc(size());
memset(image_new, 0, size());
for (size_t y = 0; y < h; y++) {
memcpy((void *)&image_new[y * image_width * image_channels],
(void *)&image_data[y * w * image_channels], (size_t) w);
}
free(image_data);
image_data = image_new;
}
void Image::flip()
{
unsigned char line[image_width*image_channels];
for (size_t y = 0; y < image_height / 2; y++) {
memcpy(line,
&image_data[y*image_width*image_channels],
image_width*image_channels);
memcpy(&image_data[y*image_width*image_channels],
&image_data[(image_height-1-y)*image_width*image_channels],
image_width*image_channels);
memcpy(&image_data[(image_height-1-y)*image_width*image_channels],
line,
image_width*image_channels);
}
}
}
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