/**

 * Test point ordering of gdImageRectangle()

 *

 * We're testing the two allowed point orders with and without thickness,

 * and verify that all sides of the rectangle are drawn.

 *

 * See also <https://github.com/libgd/libgd/issues/177>

 */

#include "gd.h"

#include "gdtest.h"

static void draw_and_check_rectangle(gdImagePtr im, int x1, int y1, int x2, int y2, int black, int red);

static void draw_and_check_pixel(gdImagePtr im, int x, int y, int black, int red);

int main()

{

    gdImagePtr im;

    int black, red;

    im = gdImageCreate(110, 210);

    gdImageColorAllocate(im, 255, 255, 255);

    black = gdImageColorAllocate(im,   0,   0,   0);

    red   = gdImageColorAllocate(im, 255,   0,   0);

    draw_and_check_rectangle(im,  10,  10,  50,  50, black, red);

    draw_and_check_rectangle(im,  50, 150,  10, 110, black, red);

    gdImageSetThickness(im, 4);

    draw_and_check_rectangle(im,  60,  10, 100,  50, black, red);

    draw_and_check_rectangle(im, 100, 150,  60, 110, black, red);

#if 0

    /* save image for debugging purposes */

    do {

        char *path;

        FILE *fp;

        path = gdTestFilePath2("gdimagerectangle", "point_ordering.png");

        fp = fopen(path, "wb");

        gdImagePng(im, fp);

        fclose(fp);

        gdFree(path);

    } while(0);

#endif

    gdImageDestroy(im);

    return gdNumFailures();

}

static void draw_and_check_rectangle(gdImagePtr im, int x1, int y1, int x2, int y2, int black, int red)

{

    int x, y;

    gdImageRectangle(im, x1, y1, x2, y2, black);

    x = (x1 + x2) / 2;

    y = (y1 + y2) / 2;

    draw_and_check_pixel(im, x,  y1, black, red);

    draw_and_check_pixel(im, x1, y,  black, red);

    draw_and_check_pixel(im, x,  y2, black, red);

    draw_and_check_pixel(im, x2, y,  black, red);

}

static void draw_and_check_pixel(gdImagePtr im, int x, int y, int black, int red)

{

    int color;

    color = gdImagePalettePixel(im, x, y);

    gdTestAssertMsg(color == black, "expected color %d, but got color %d\n", black, color);

    gdImageSetPixel(im, x, y, red);

}