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/**
* $Id:
*
* ***** 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 *****
*/
#include <string.h>
#include "zlib.h"
#include "BKE_utildefines.h"
#include "BKE_global.h"
#include "IMB_imbuf_types.h"
#include "IMB_imbuf.h"
#include "IMB_thumbs.h"
#include "MEM_guardedalloc.h"
/* extracts the thumbnail from between the 'REND' and the 'GLOB'
* chunks of the header, dont use typical blend loader because its too slow */
ImBuf *IMB_loadblend_thumb(const char *path)
{
char buf[8];
int code= 0;
char endian, pointer_size;
char endian_switch;
int len, im_len, x, y;
int *rect= NULL;
gzFile gzfile;
ImBuf *img;
/* not necessarily a gzip */
gzfile = gzopen(path, "rb");
if (NULL == gzfile ) {
return NULL;
}
/* read the blend file header */
if(gzread(gzfile, buf, 8) != 8) goto thumb_error;
if(strncmp(buf, "BLENDER", 7)) goto thumb_error;
if(buf[7]=='-') pointer_size= 8;
else if(buf[7]=='_') pointer_size= 4;
else goto thumb_error;
/* read the next 4 bytes, only need the first char, ignore the version */
/* endian and vertsion (ignored) */
if(gzread(gzfile, buf, 4) != 4) goto thumb_error;
if(buf[0]=='V') endian= B_ENDIAN; /* big: PPC */
else if(buf[0]=='v') endian= L_ENDIAN; /* little: x86 */
else goto thumb_error;
while(gzread(gzfile, &code, sizeof(int)) == sizeof(int)) {
endian_switch = ((ENDIAN_ORDER != endian)) ? 1 : 0;
if(gzread(gzfile, buf, sizeof(int)) != sizeof(int)) goto thumb_error;
len = *( (int *)((void *)buf) );
if(endian_switch) SWITCH_INT(len);
/* finally read the rest of the bhead struct, pointer and 2 ints */
if(gzread(gzfile, buf, pointer_size) != pointer_size) goto thumb_error;
if(gzread(gzfile, buf, sizeof(int) * 2) != sizeof(int) * 2) goto thumb_error;
/* we dont actually care whats in the bhead */
if (code==REND) {
gzseek(gzfile, len, SEEK_CUR); /* skip to the next */
}
else {
break;
}
}
/* using 'TEST' since new names segfault when loading in old blenders */
if(code != TEST) goto thumb_error;
if(gzread(gzfile, &x, sizeof(int)) != sizeof(int)) goto thumb_error;
if(gzread(gzfile, &y, sizeof(int)) != sizeof(int)) goto thumb_error;
len -= sizeof(int) * 2;
if(endian_switch) { SWITCH_INT(x); SWITCH_INT(y); }
/* inconsistant image size, quit early */
im_len = x * y * sizeof(int);
if(im_len != len) goto thumb_error;
/* finally malloc and read the data */
rect= MEM_mallocN(len, "imb_loadblend_thumb");
if(gzread(gzfile, rect, len) != len) goto thumb_error;
/* read ok! */
gzclose(gzfile);
img = IMB_allocImBuf(x, y, 32, IB_rect | IB_metadata, 0);
memcpy(img->rect, rect, im_len);
MEM_freeN(rect);
return img;
thumb_error:
gzclose(gzfile);
if(rect) MEM_freeN(rect);
return NULL;
}
/* add a fake passepartout overlay to a byte buffer, use for blend file thumbnails */
#define MARGIN 2
void IMB_overlayblend_thumb(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 hline, vline;
int stride_x= (margin_r - margin_l) - 2;
for(y=0; y < height; y++) {
for(x=0; x < width; x++, px+=4) {
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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