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/*
* ***** BEGIN GPL LICENSE BLOCK *****
*
* 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.
*
* Contributor(s): Campbell Barton.
*
* ***** END GPL LICENSE BLOCK *****
*/
/** \file blender/imbuf/intern/thumbs_blend.c
* \ingroup imbuf
*/
#include <stdlib.h>
#include <string.h>
#include "BLI_utildefines.h"
#include "BLI_endian_switch.h"
#include "BLI_fileops.h"
#include "BLI_linklist.h"
#include "BLO_blend_defs.h"
#include "BLO_readfile.h"
#include "BKE_global.h"
#include "BKE_idcode.h"
#include "BKE_icons.h"
#include "BKE_library.h"
#include "BKE_main.h"
#include "DNA_ID.h" /* For preview images... */
#include "IMB_imbuf_types.h"
#include "IMB_imbuf.h"
#include "IMB_thumbs.h"
#include "MEM_guardedalloc.h"
ImBuf *IMB_thumb_load_blend(const char *blen_path, const char *blen_group, const char *blen_id)
{
ImBuf *ima = NULL;
if (blen_group && blen_id) {
LinkNode *ln, *names, *lp, *previews = NULL;
struct BlendHandle *libfiledata = BLO_blendhandle_from_file(blen_path, NULL);
int idcode = BKE_idcode_from_name(blen_group);
int i, nprevs, nnames;
if (libfiledata == NULL) {
return ima;
}
/* Note: we should handle all previews for a same group at once, would avoid reopening .blend file
* for each and every ID. However, this adds some complexity, so keep it for later. */
names = BLO_blendhandle_get_datablock_names(libfiledata, idcode, &nnames);
previews = BLO_blendhandle_get_previews(libfiledata, idcode, &nprevs);
BLO_blendhandle_close(libfiledata);
if (!previews || (nnames != nprevs)) {
if (previews != 0) {
/* No previews at all is not a bug! */
printf("%s: error, found %d items, %d previews\n", __func__, nnames, nprevs);
}
BLI_linklist_free(previews, BKE_previewimg_freefunc);
BLI_linklist_free(names, free);
return ima;
}
for (i = 0, ln = names, lp = previews; i < nnames; i++, ln = ln->next, lp = lp->next) {
const char *blockname = ln->link;
PreviewImage *img = lp->link;
if (STREQ(blockname, blen_id)) {
if (img) {
unsigned int w = img->w[ICON_SIZE_PREVIEW];
unsigned int h = img->h[ICON_SIZE_PREVIEW];
unsigned int *rect = img->rect[ICON_SIZE_PREVIEW];
if (w > 0 && h > 0 && rect) {
/* first allocate imbuf for copying preview into it */
ima = IMB_allocImBuf(w, h, 32, IB_rect);
memcpy(ima->rect, rect, w * h * sizeof(unsigned int));
}
}
break;
}
}
BLI_linklist_free(previews, BKE_previewimg_freefunc);
BLI_linklist_free(names, free);
}
else {
BlendThumbnail *data;
data = BLO_thumbnail_from_file(blen_path);
ima = BKE_main_thumbnail_to_imbuf(NULL, data);
if (data) {
MEM_freeN(data);
}
}
return ima;
}
/* add a fake passepartout overlay to a byte buffer, use for blend file thumbnails */
#define MARGIN 2
void IMB_thumb_overlay_blend(unsigned int *thumb, int width, int height, float aspect)
{
unsigned char *px = (unsigned char *)thumb;
int margin_l = MARGIN;
int margin_b = MARGIN;
int margin_r = width - MARGIN;
int margin_t = height - MARGIN;
if (aspect < 1.0f) {
margin_l = (int)((width - ((float)width * aspect)) / 2.0f);
margin_l += MARGIN;
CLAMP(margin_l, MARGIN, (width / 2));
margin_r = width - margin_l;
}
else if (aspect > 1.0f) {
margin_b = (int)((height - ((float)height / aspect)) / 2.0f);
margin_b += MARGIN;
CLAMP(margin_b, MARGIN, (height / 2));
margin_t = height - margin_b;
}
{
int x, y;
int stride_x = (margin_r - margin_l) - 2;
for (y = 0; y < height; y++) {
for (x = 0; x < width; x++, px += 4) {
int hline = 0, vline = 0;
if ((x > margin_l && x < margin_r) && (y > margin_b && y < margin_t)) {
/* interior. skip */
x += stride_x;
px += stride_x * 4;
}
else if ((hline = (((x == margin_l || x == margin_r)) && y >= margin_b && y <= margin_t)) ||
(vline = (((y == margin_b || y == margin_t)) && x >= margin_l && x <= margin_r)))
{
/* dashed line */
if ((hline && y % 2) || (vline && x % 2)) {
px[0] = px[1] = px[2] = 0;
px[3] = 255;
}
}
else {
/* outside, fill in alpha, like passepartout */
px[0] *= 0.5f;
px[1] *= 0.5f;
px[2] *= 0.5f;
px[3] = (px[3] * 0.5f) + 96;
}
}
}
}
}
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