// Copyright 2026 Google LLC

//

// Licensed under the Apache License, Version 2.0 (the "License");

// you may not use this file except in compliance with the License.

// You may obtain a copy of the License at

//

//      http://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing, software

// distributed under the License is distributed on an "AS IS" BASIS,

// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

// See the License for the specific language governing permissions and

// limitations under the License.

#ifndef COMMON_DRAWING_H

#define COMMON_DRAWING_H

#include <cairo.h>

#include <stdint.h>

#include <string.h>

static void do_drawing(cairo_t *cr, const uint8_t *data, size_t size) {

    if (size < 4) return;

    // Use some bytes for color and basic params

    double r = data[0] / 255.0;

    double g = data[1] / 255.0;

    double b = data[2] / 255.0;

    double a = data[3] / 255.0;

    cairo_set_source_rgba(cr, r, g, b, a);

    cairo_set_line_width(cr, (size > 4 ? data[4] : 10) / 10.0);

    size_t offset = 5;

    while (offset + 16 <= size) {

        uint8_t op = data[offset++] % 8;

        double x1 = data[offset++];

        double y1 = data[offset++];

        double x2 = data[offset++];

        double y2 = data[offset++];

        double x3 = data[offset++];

        double y3 = data[offset++];

        switch (op) {

            case 0:

                cairo_move_to(cr, x1, y1);

                break;

            case 1:

                cairo_line_to(cr, x1, y1);

                break;

            case 2:

                cairo_curve_to(cr, x1, y1, x2, y2, x3, y3);

                break;

            case 3:

                cairo_rectangle(cr, x1, y1, x2, y2);

                break;

            case 4:

                cairo_arc(cr, x1, y1, x2 / 10.0, 0, 2 * 3.14159);

                break;

            case 5:

                cairo_fill(cr);

                cairo_set_source_rgba(cr, x1/255.0, y1/255.0, x2/255.0, y2/255.0);

                break;

            case 6:

                cairo_stroke(cr);

                break;

            case 7:

                cairo_clip(cr);

                break;

        }

        offset += 10; // skip some bytes to use for next ops

    }

}

#endif