nesemu/gui/canvas.c

//
// Created by william on 16/05/24.
//

#include <assert.h>
#include <string.h>
#include <stdlib.h>
#include "canvas.h"

Canvas canvas_init(int width, int height) {
    assert(width > 0);
    assert(height > 0);

    Canvas canvas;
    canvas.width = width;
    canvas.height = height;

    int size = width * height;
    canvas.pixels = malloc(sizeof(Pixel) * size);

    return canvas;
}

void canvas_uninit(Canvas *canvas) {
    assert(canvas != NULL);
    assert(canvas->pixels != NULL);

    free(canvas->pixels);
}

void canvas_draw(Canvas *canvas, Pixel pixel, int index) {
    assert(index >= 0);
    assert(index < canvas->width * canvas->height);

    canvas->pixels[index] = pixel;
}

void canvas_draw_pos(Canvas *canvas, Pixel pixel, int x, int y) {
    assert(x >= 0);
    assert(x < canvas->width);
    assert(y >= 0);
    assert(y < canvas->height);

    int index = x + y * canvas->width;
    canvas_draw(canvas, pixel, index);
}

void canvas_reset(Canvas *canvas) {
    memset(canvas->pixels, 0, sizeof(Pixel) * (canvas->width * canvas->height));
}