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/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* The Original Code is Copyright (C) 2008 Blender Foundation.
* All rights reserved.
*/
/** \file
* \ingroup edutil
*/
#include "MEM_guardedalloc.h"
#include "BLI_bitmap.h"
#include "BLI_bitmap_draw_2d.h"
#include "BLI_rect.h"
#include "BLI_utildefines.h"
#include "ED_select_buffer_utils.h"
/* Only for #ED_view3d_select_id_read,
* note that this file shouldn't have 3D view specific logic in it, we could have a more general
* way to read from selection buffers that doesn't depend on the view3d API. */
#include "ED_view3d.h"
/**
* \param bitmap_len: Number of indices in the selection id buffer.
* \param rect: The rectangle to sample indices from (min/max inclusive).
* \returns a #BLI_bitmap the length of \a bitmap_len or NULL on failure.
*/
uint *ED_select_buffer_bitmap_from_rect(const uint bitmap_len, const rcti *rect)
{
uint buf_len;
const uint *buf = ED_view3d_select_id_read(
rect->xmin, rect->ymin, rect->xmax, rect->ymax, &buf_len);
if (buf == NULL) {
return NULL;
}
const uint *buf_iter = buf;
BLI_bitmap *bitmap_buf = BLI_BITMAP_NEW(bitmap_len, __func__);
while (buf_len--) {
const uint index = *buf_iter - 1;
if (index < bitmap_len) {
BLI_BITMAP_ENABLE(bitmap_buf, index);
}
buf_iter++;
}
MEM_freeN((void *)buf);
return bitmap_buf;
}
/**
* \param bitmap_len: Number of indices in the selection id buffer.
* \param center: Circle center.
* \param radius: Circle radius.
* \returns a #BLI_bitmap the length of \a bitmap_len or NULL on failure.
*/
uint *ED_select_buffer_bitmap_from_circle(const uint bitmap_len,
const int center[2],
const int radius)
{
if (bitmap_len == 0) {
return NULL;
}
const int xmin = center[0] - radius;
const int xmax = center[0] + radius;
const int ymin = center[1] - radius;
const int ymax = center[1] + radius;
const uint *buf = ED_view3d_select_id_read(xmin, ymin, xmax, ymax, NULL);
if (buf == NULL) {
return NULL;
}
const uint *buf_iter = buf;
BLI_bitmap *bitmap_buf = BLI_BITMAP_NEW(bitmap_len, __func__);
const int radius_sq = radius * radius;
for (int yc = -radius; yc <= radius; yc++) {
for (int xc = -radius; xc <= radius; xc++, buf_iter++) {
if (xc * xc + yc * yc < radius_sq) {
/* Intentionally wrap to max value if this is zero. */
const uint index = *buf_iter - 1;
if (index < bitmap_len) {
BLI_BITMAP_ENABLE(bitmap_buf, index);
}
}
}
}
MEM_freeN((void *)buf);
return bitmap_buf;
}
struct PolyMaskData {
BLI_bitmap *px;
int width;
};
static void ed_select_buffer_mask_px_cb(int x, int x_end, int y, void *user_data)
{
struct PolyMaskData *data = user_data;
BLI_bitmap *px = data->px;
int i = (y * data->width) + x;
do {
BLI_BITMAP_ENABLE(px, i);
i++;
} while (++x != x_end);
}
/**
* \param bitmap_len: Number of indices in the selection id buffer.
* \param center: Circle center.
* \param radius: Circle radius.
* \returns a #BLI_bitmap the length of \a bitmap_len or NULL on failure.
*/
uint *ED_select_buffer_bitmap_from_poly(const uint bitmap_len,
const int poly[][2],
const int poly_len,
const rcti *rect)
{
if (bitmap_len == 0) {
return NULL;
}
struct PolyMaskData poly_mask_data;
uint buf_len;
const uint *buf = ED_view3d_select_id_read(
rect->xmin, rect->ymin, rect->xmax, rect->ymax, &buf_len);
if (buf == NULL) {
return NULL;
}
BLI_bitmap *buf_mask = BLI_BITMAP_NEW(buf_len, __func__);
poly_mask_data.px = buf_mask;
poly_mask_data.width = (rect->xmax - rect->xmin) + 1;
BLI_bitmap_draw_2d_poly_v2i_n(rect->xmin,
rect->ymin,
rect->xmax + 1,
rect->ymax + 1,
poly,
poly_len,
ed_select_buffer_mask_px_cb,
&poly_mask_data);
/* Build selection lookup. */
const uint *buf_iter = buf;
BLI_bitmap *bitmap_buf = BLI_BITMAP_NEW(bitmap_len, __func__);
int i = 0;
while (buf_len--) {
const uint index = *buf_iter - 1;
if (index < bitmap_len && BLI_BITMAP_TEST(buf_mask, i)) {
BLI_BITMAP_ENABLE(bitmap_buf, index);
}
buf_iter++;
i++;
}
MEM_freeN((void *)buf);
MEM_freeN(buf_mask);
return bitmap_buf;
}
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