Bitmap.h

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#pragma once
#include <litehtml.h>
using namespace litehtml;
using rect = position;
namespace canvas_ity { class canvas; }
using namespace canvas_ity;
 
// color != web_color because sizeof(web_color) != 4
struct color
{
    byte r, g, b, a;
 
    color() : r(0), g(0), b(0), a(0) {}
    color(byte r, byte g, byte b, byte a) : r(r), g(g), b(b), a(a) {}
    color(web_color c) : r(c.red), g(c.green), b(c.blue), a(c.alpha) {}
 
    bool operator==(color c) const { return r == c.r && g == c.g && b == c.b && a == c.a; }
    bool operator!=(color c) const { return !(*this == c); }
};
const color white(255,255,255,255);
const color black(0,0,0,255);
const color transparent(0,0,0,0);
 
class Bitmap
{
public:
    int width  = 0;
    int height = 0;
    vector<color> data;
 
    Bitmap() {}
    Bitmap(int width, int height, color color = white) : width(width), height(height)
    {
        data.resize(width * height, color);
    }
    Bitmap(string filename)
    {
        load(filename);
    }
    Bitmap(canvas& canvas);
 
    bool operator==(const Bitmap& bmp) const { return width == bmp.width && height == bmp.height && data == bmp.data; }
    bool operator!=(const Bitmap& bmp) const { return !(*this == bmp); }
    operator bool() const { return width != 0 && height != 0; }
 
    color get_pixel(int x, int y) const;
    void set_pixel(int x, int y, color color);
    void draw_line(int x0, int y0, int x1, int y1, color color);
    void draw_rect(int x, int y, int width, int height, color color);
    void fill_rect(rect rect, color color);
    void replace_color(color original, color replacement);
 
    rect find_picture(color bgcolor = white);
    void load(string filename);
    void save(string filename);
};
 
byte max_color_diff(const Bitmap& a, const Bitmap& b);