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/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright 2001-2002 NaN Holding BV. All rights reserved. */
/** \file
* \ingroup imbuf
*/
#include "BLI_utildefines.h"
#include "MEM_guardedalloc.h"
#include "IMB_imbuf.h"
#include "IMB_imbuf_types.h"
#include "imbuf.h"
void IMB_flipy(struct ImBuf *ibuf)
{
size_t x_size, y_size;
if (ibuf == NULL) {
return;
}
if (ibuf->rect) {
unsigned int *top, *bottom, *line;
x_size = ibuf->x;
y_size = ibuf->y;
const size_t stride = x_size * sizeof(int);
top = ibuf->rect;
bottom = top + ((y_size - 1) * x_size);
line = MEM_mallocN(stride, "linebuf");
y_size >>= 1;
for (; y_size > 0; y_size--) {
memcpy(line, top, stride);
memcpy(top, bottom, stride);
memcpy(bottom, line, stride);
bottom -= x_size;
top += x_size;
}
MEM_freeN(line);
}
if (ibuf->rect_float) {
float *topf = NULL, *bottomf = NULL, *linef = NULL;
x_size = ibuf->x;
y_size = ibuf->y;
const size_t stride = x_size * 4 * sizeof(float);
topf = ibuf->rect_float;
bottomf = topf + 4 * ((y_size - 1) * x_size);
linef = MEM_mallocN(stride, "linebuf");
y_size >>= 1;
for (; y_size > 0; y_size--) {
memcpy(linef, topf, stride);
memcpy(topf, bottomf, stride);
memcpy(bottomf, linef, stride);
bottomf -= 4 * x_size;
topf += 4 * x_size;
}
MEM_freeN(linef);
}
}
void IMB_flipx(struct ImBuf *ibuf)
{
int x, y, xr, xl, yi;
float px_f[4];
if (ibuf == NULL) {
return;
}
x = ibuf->x;
y = ibuf->y;
if (ibuf->rect) {
for (yi = y - 1; yi >= 0; yi--) {
const size_t x_offset = (size_t)x * yi;
for (xr = x - 1, xl = 0; xr >= xl; xr--, xl++) {
SWAP(unsigned int, ibuf->rect[x_offset + xr], ibuf->rect[x_offset + xl]);
}
}
}
if (ibuf->rect_float) {
for (yi = y - 1; yi >= 0; yi--) {
const size_t x_offset = (size_t)x * yi;
for (xr = x - 1, xl = 0; xr >= xl; xr--, xl++) {
memcpy(&px_f, &ibuf->rect_float[(x_offset + xr) * 4], sizeof(float[4]));
memcpy(&ibuf->rect_float[(x_offset + xr) * 4],
&ibuf->rect_float[(x_offset + xl) * 4],
sizeof(float[4]));
memcpy(&ibuf->rect_float[(x_offset + xl) * 4], &px_f, sizeof(float[4]));
}
}
}
}
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