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It is generally not a good idea to have an API with a high number of functions because it adds complexity for user and for maintainability, so both function have been "merged" into a single RFlipImage with a parameter to specify what flip is expected. As a bonus, the function can perform both flips at once if wanted. Signed-off-by: Christophe CURIS <christophe.curis@free.fr>
163 lines
3.4 KiB
C
163 lines
3.4 KiB
C
/* flip.c - image flip
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*
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* Raster graphics library
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*
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* Copyright (c) 2014 Window Maker Team
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the Free
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* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*/
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#include "config.h"
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <X11/Xlib.h>
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#include "wraster.h"
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#include "rotate.h"
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static RImage *r_flip_vertically(RImage *source);
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static RImage *r_flip_horizontally(RImage *source);
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/* Flip an image in the direction(s) specified */
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RImage *RFlipImage(RImage *source, int mode)
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{
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/* Security */
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if (source == NULL)
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return NULL;
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switch (mode & (RVerticalFlip | RHorizontalFlip)) {
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case RHorizontalFlip:
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return r_flip_horizontally(source);
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case RVerticalFlip:
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return r_flip_vertically(source);
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case RHorizontalFlip | RVerticalFlip:
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return wraster_rotate_image_180(source);
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default:
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return RRetainImage(source);
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}
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}
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RImage *r_flip_vertically(RImage *source)
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{
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RImage *target;
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int nwidth, nheight;
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int x, y;
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nwidth = source->width;
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nheight = source->height;
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target = RCreateImage(nwidth, nheight, (source->format != RRGBFormat));
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if (!target)
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return NULL;
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if (source->format == RRGBFormat) {
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unsigned char *optr, *nptr;
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optr = source->data;
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nptr = target->data + 3 * (nwidth * nheight - nwidth);
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for (y = 0; y < nheight; y++) {
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for (x = 0; x < nwidth; x++) {
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nptr[0] = optr[0];
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nptr[1] = optr[1];
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nptr[2] = optr[2];
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optr += 3;
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nptr += 3;
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}
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nptr -= (nwidth * 3) * 2;
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}
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} else {
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unsigned char *optr, *nptr;
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optr = source->data;
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nptr = target->data + 4 * (nwidth * nheight - nwidth);
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for (y = 0; y < nheight; y++) {
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for (x = 0; x < nwidth; x++) {
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nptr[0] = optr[0];
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nptr[1] = optr[1];
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nptr[2] = optr[2];
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nptr[3] = optr[3];
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optr += 4;
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nptr += 4;
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}
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nptr -= (nwidth * 4) * 2;
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}
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}
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return target;
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}
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RImage *r_flip_horizontally(RImage *source)
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{
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RImage *target;
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int nwidth, nheight;
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int x, y;
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nwidth = source->width;
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nheight = source->height;
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target = RCreateImage(nwidth, nheight, (source->format != RRGBFormat));
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if (!target)
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return NULL;
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if (source->format == RRGBFormat) {
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unsigned char *optr, *nptr;
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optr = source->data;
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nptr = target->data + 3 * (nwidth - 1);
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for (y = nheight; y; y--) {
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for (x = 0; x < nwidth; x++) {
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nptr[0] = optr[0];
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nptr[1] = optr[1];
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nptr[2] = optr[2];
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optr += 3;
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nptr -= 3;
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}
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nptr += (nwidth * 3) * 2;
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}
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} else {
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unsigned char *optr, *nptr;
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optr = source->data;
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nptr = target->data + 4 * (nwidth - 1);
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for (y = nheight; y; y--) {
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for (x = 0; x < nwidth; x++) {
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nptr[0] = optr[0];
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nptr[1] = optr[1];
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nptr[2] = optr[2];
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nptr[3] = optr[3];
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optr += 4;
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nptr -= 4;
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}
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nptr += (nwidth * 4) * 2;
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}
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}
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return target;
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}
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