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#include "image.h"
#include "core/exception.h"
namespace image
{
void Image::draw_image(int c, Image image, int x0, int y0)
{
if (image.d_depth != d_depth)
throw satdump_exception("draw_image bit depth must be the same!");
// Get min height and width, mostly for safety
int width = std::min<int>(d_width, x0 + image.width()) - x0;
int height = std::min<int>(d_height, y0 + image.height()) - y0;
for (int x = 0; x < width; x++)
for (int y = 0; y < height; y++)
if (y + y0 >= 0 && x + x0 >= 0)
set(c, x + x0, (y + y0), image.get(0, x, y));
if (c == 0 && image.channels() == d_channels) // Special case for non-grayscale images
{
for (int c = 1; c < d_channels; c++)
for (int x = 0; x < width; x++)
for (int y = 0; y < height; y++)
if (y + y0 >= 0 && x + x0 >= 0)
set(c, x + x0, (y + y0), image.get(c, x, y));
}
}
void Image::draw_pixel(size_t x, size_t y, std::vector<double> color)
{
if (color.size() < (size_t)d_channels)
throw satdump_exception("draw_pixel color needs to have at least as many colors as the image!");
for (int c = 0; c < d_channels; c++)
setf(c, x, y, color[c]);
}
void Image::draw_line(int x0, int y0, int x1, int y1, std::vector<double> color)
{
if (x0 < 0 || x0 >= (int)d_width)
return;
if (x1 < 0 || x1 >= (int)d_width)
return;
if (y0 < 0 || y0 >= (int)d_height)
return;
if (y1 < 0 || y1 >= (int)d_height)
return;
int dx = abs(x1 - x0), sx = x0 < x1 ? 1 : -1;
int dy = abs(y1 - y0), sy = y0 < y1 ? 1 : -1;
int err = (dx > dy ? dx : -dy) / 2, e2;
while (!(x0 == x1 && y0 == y1))
{
draw_pixel(x0, y0, color);
e2 = err;
if (e2 > -dx)
{
err -= dy;
x0 += sx;
}
if (e2 < dy)
{
err += dx;
y0 += sy;
}
}
}
void Image::draw_circle(int x0, int y0, int radius, std::vector<double> color, bool fill)
{
if (fill) // Filled circle
{
int x = radius;
int y = 0;
int err = 1 - x;
while (x >= y)
{
draw_line(-x + x0, y + y0, x + x0, y + y0, color);
if (y != 0)
draw_line(-x + x0, -y + y0, x + x0, -y + y0, color);
y++;
if (err < 0)
err += 2 * y + 1;
else
{
if (x >= y)
{
draw_line(-y + 1 + x0, x + y0, y - 1 + x0, x + y0, color);
draw_line(-y + 1 + x0, -x + y0, y - 1 + x0, -x + y0, color);
}
x--;
err += 2 * (y - x + 1);
}
}
}
else // Hollow circle
{
int err = 1 - radius;
int xx = 0;
int yy = -2 * radius;
int x = 0;
int y = radius;
draw_pixel(x0, y0 + radius, color);
draw_pixel(x0, y0 - radius, color);
draw_pixel(x0 + radius, y0, color);
draw_pixel(x0 - radius, y0, color);
while (x < y)
{
if (err >= 0)
{
y--;
yy += 2;
err += yy;
}
x++;
xx += 2;
err += xx + 1;
draw_pixel(x0 + x, y0 + y, color);
draw_pixel(x0 - x, y0 + y, color);
draw_pixel(x0 + x, y0 - y, color);
draw_pixel(x0 - x, y0 - y, color);
draw_pixel(x0 + y, y0 + x, color);
draw_pixel(x0 - y, y0 + x, color);
draw_pixel(x0 + y, y0 - x, color);
draw_pixel(x0 - y, y0 - x, color);
}
}
}
void Image::draw_rectangle(int x0, int y0, int x1, int y1, std::vector<double> color, bool fill)
{
if (fill)
{
for (int y = std::min(y0, y1); y < std::max(y0, y1); y++)
draw_line(x0, y, x1, y, color);
}
else
{
draw_line(x0, y0, x0, y1, color);
draw_line(x0, y1, x1, y1, color);
draw_line(x1, y1, x1, y0, color);
draw_line(x1, y0, x0, y0, color);
}
}
}
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