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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 <string.h>
#include "zlib.h"
#include "BLI_utildefines.h"
#include "BLI_endian_switch.h"
#include "BLI_fileops.h"
#include "BLO_blend_defs.h"
#include "BKE_global.h"
#include "IMB_imbuf_types.h"
#include "IMB_imbuf.h"
#include "IMB_thumbs.h"
/* extracts the thumbnail from between the 'REND' and the 'GLOB'
* chunks of the header, don't use typical blend loader because its too slow */
static ImBuf *loadblend_thumb(gzFile gzfile)
{
char buf[12];
int bhead[24 / sizeof(int)]; /* max size on 64bit */
char endian, pointer_size;
char endian_switch;
int sizeof_bhead;
/* read the blend file header */
if (gzread(gzfile, buf, 12) != 12)
return NULL;
if (!STREQLEN(buf, "BLENDER", 7))
return NULL;
if (buf[7] == '-')
pointer_size = 8;
else if (buf[7] == '_')
pointer_size = 4;
else
return NULL;
sizeof_bhead = 16 + pointer_size;
if (buf[8] == 'V')
endian = B_ENDIAN; /* big: PPC */
else if (buf[8] == 'v')
endian = L_ENDIAN; /* little: x86 */
else
return NULL;
endian_switch = ((ENDIAN_ORDER != endian)) ? 1 : 0;
while (gzread(gzfile, bhead, sizeof_bhead) == sizeof_bhead) {
if (endian_switch)
BLI_endian_switch_int32(&bhead[1]); /* length */
if (bhead[0] == REND) {
gzseek(gzfile, bhead[1], SEEK_CUR); /* skip to the next */
}
else {
break;
}
}
/* using 'TEST' since new names segfault when loading in old blenders */
if (bhead[0] == TEST) {
ImBuf *img = NULL;
int size[2];
if (gzread(gzfile, size, sizeof(size)) != sizeof(size))
return NULL;
if (endian_switch) {
BLI_endian_switch_int32(&size[0]);
BLI_endian_switch_int32(&size[1]);
}
/* length */
bhead[1] -= sizeof(int) * 2;
/* inconsistent image size, quit early */
if (bhead[1] != size[0] * size[1] * sizeof(int))
return NULL;
/* finally malloc and read the data */
img = IMB_allocImBuf(size[0], size[1], 32, IB_rect | IB_metadata);
if (gzread(gzfile, img->rect, bhead[1]) != bhead[1]) {
IMB_freeImBuf(img);
img = NULL;
}
return img;
}
return NULL;
}
ImBuf *IMB_loadblend_thumb(const char *path)
{
gzFile gzfile;
/* not necessarily a gzip */
gzfile = BLI_gzopen(path, "rb");
if (NULL == gzfile) {
return NULL;
}
else {
ImBuf *img = loadblend_thumb(gzfile);
/* read ok! */
gzclose(gzfile);
return img;
}
}
/* add a fake passepartout overlay to a byte buffer, use for blend file thumbnails */
#define MARGIN 2
void IMB_overlayblend_thumb(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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