/**

 * File: Transformations

 */

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif /* HAVE_CONFIG_H */

#include "gd.h"

/**

 * Function: gdImageFlipVertical

 *

 * Flip an image vertically

 *

 * The image is mirrored upside-down.

 *

 * Parameters:

 *   im - The image.

 *

 * See also:

 *   - <gdImageFlipHorizontal>

 *   - <gdImageFlipBoth>

 */

BGD_DECLARE(void) gdImageFlipVertical(gdImagePtr im)

{

	register int x, y;

	if (im->trueColor) {

		for (y = 0; y < im->sy / 2; y++) {

			int *row_dst = im->tpixels[y];

			int *row_src = im->tpixels[im->sy - 1 - y];

			for (x = 0; x < im->sx; x++) {

				register int p;

				p = row_dst[x];

				row_dst[x] = im->tpixels[im->sy - 1 - y][x];

				row_src[x] = p;

			}

		}

	} else {

		unsigned char p;

		for (y = 0; y < im->sy / 2; y++) {

			for (x = 0; x < im->sx; x++) {

				p = im->pixels[y][x];

				im->pixels[y][x] =	im->pixels[im->sy - 1 - y][x];

				im->pixels[im->sy - 1 - y][x] = p;

			}

		}

	}

	return;

}

/**

 * Function: gdImageFlipHorizontal

 *

 * Flip an image horizontally

 *

 * The image is mirrored left-right.

 *

 * Parameters:

 *   im - The image.

 *

 * See also:

 *   - <gdImageFlipVertical>

 *   - <gdImageFlipBoth>

 */

BGD_DECLARE(void) gdImageFlipHorizontal(gdImagePtr im)

{

	int x, y;

	if (im->trueColor) {

		int *px1, *px2, tmp;

		for (y = 0; y < im->sy; y++) {

			px1 = im->tpixels[y];

			px2 = im->tpixels[y] + im->sx - 1;

			for (x = 0; x < (im->sx >> 1); x++) {

				tmp = *px1;

				*px1 = *px2;

				*px2 = tmp;

				px1++;

				px2--;

			}

		}

	} else {

		unsigned char *px1, *px2, tmp;

		for (y = 0; y < im->sy; y++) {

			px1 = im->pixels[y];

			px2 = im->pixels[y] + im->sx - 1;

			for (x = 0; x < (im->sx >> 1); x++) {

				tmp = *px1;

				*px1 = *px2;

				*px2 = tmp;

				px1++;

				px2--;

			}

		}

	}

}

/**

 * Function: gdImageFlipBoth

 *

 * Flip an image vertically and horizontally

 *

 * The image is mirrored upside-down and left-right.

 *

 * Parameters:

 *   im - The image.

 *

 * See also:

 *   - <gdImageFlipVertical>

 *   - <gdImageFlipHorizontal>

 */

BGD_DECLARE(void) gdImageFlipBoth(gdImagePtr im)

{

	gdImageFlipVertical(im);

	gdImageFlipHorizontal(im);

}