gimp/app/gimppreviewcache.c

272 lines
7.0 KiB
C

/* The GIMP -- an image manipulation program
* Copyright (C) 1999 Andy Thomas alt@gimp.org
*
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <string.h>
#include "gimpdrawableP.h"
#include "gimage.h"
#include "temp_buf.h"
#include "gimppreviewcache.h"
static gint
preview_cache_compare(gconstpointer a,
gconstpointer b)
{
PreviewCache *pc1 = (PreviewCache *)a;
PreviewCache *pc2 = (PreviewCache *)b;
if(pc1->width > pc2->width && pc1->height > pc2->height)
return -1;
return 1;
}
static void
preview_cache_find_exact(gpointer data, gpointer udata)
{
PreviewCache *pc = (PreviewCache *)data;
PreviewNearest *pNearest = (PreviewNearest *)udata;
/* printf("this value w,h [%d,%d]\n",pc->width,pc->height); */
/* if(pNearest->pc) */
/* printf("current nearest value w,h [%d,%d]\n",pNearest->pc->width,pNearest->pc->height); */
if(pNearest->pc)
return;
if(pc->width == pNearest->width &&
pc->height == pNearest->height)
{
/* Ok we could make the preview out of this one...
* If we already have it are these bigger dimensions?
*/
pNearest->pc = pc;
return;
}
}
static void
preview_cache_find_biggest(gpointer data, gpointer udata)
{
PreviewCache *pc = (PreviewCache *)data;
PreviewNearest *pNearest = (PreviewNearest *)udata;
/* printf("this value w,h [%d,%d]\n",pc->width,pc->height); */
/* if(pNearest->pc) */
/* printf("current nearest value w,h [%d,%d]\n",pNearest->pc->width,pNearest->pc->height); */
if(pc->width >= pNearest->width &&
pc->height >= pNearest->height)
{
/* Ok we could make the preview out of this one...
* If we already have it are these bigger dimensions?
*/
if(pNearest->pc)
{
if(pNearest->pc->width > pc->width &&
pNearest->pc->height > pc->height)
return;
}
pNearest->pc = pc;
}
}
static void
preview_cache_remove_smallest(GSList **plist)
{
GSList *cur = *plist;
PreviewCache *smallest = NULL;
/* printf("Removing smallest\n"); */
if(!cur)
return;
do
{
if(!smallest)
{
smallest = cur->data;
/* printf("init smallest %d,%d\n",smallest->width,smallest->height); */
}
else
{
PreviewCache *pcthis = cur->data;
/* printf("Checking %d,%d\n",pcthis->width,pcthis->height); */
if((smallest->height*smallest->width) >=
(pcthis->height*pcthis->width))
{
smallest = pcthis;
/* printf("smallest now %d,%d\n",smallest->width,smallest->height); */
}
}
} while((cur = g_slist_next(cur)));
*plist = g_slist_remove(*plist,smallest);
/* printf("removed %d,%d\n",smallest->width,smallest->height); */
/* printf("removed smallest\n"); */
}
static void
preview_cache_invalidate(gpointer data, gpointer udata)
{
PreviewCache *pc = (PreviewCache *)data;
temp_buf_free (pc->preview);
g_free(pc);
}
static void
preview_cache_print(gpointer data, gpointer udata)
{
/* PreviewCache *pc = (PreviewCache *)data; */
if(!data)
{
/* printf("\tNo Cache\n"); */
return;
}
/* printf("\tvalue w,h [%d,%d] => %p\n",pc->width,pc->height,pc->preview); */
}
void
gimp_preview_cache_invalidate(GSList **plist)
{
/* printf("gimp_preview_cache_invalidate\n"); */
g_slist_foreach(*plist,preview_cache_print,NULL);
g_slist_foreach(*plist,preview_cache_invalidate,NULL);
*plist = NULL;
}
void
gimp_preview_cache_add(GSList **plist,
TempBuf *buf)
{
PreviewCache *pc;
/* printf("gimp_preview_cache_add %d %d\n",buf->width,buf->height); */
g_slist_foreach(*plist,preview_cache_print,NULL);
if(g_slist_length(*plist) > MAX_CACHE_PREVIEWS)
{
/* Remove the smallest */
preview_cache_remove_smallest(plist);
}
pc = g_new0(PreviewCache,1);
pc->preview = buf;
pc->width = buf->width;
pc->height = buf->height;
*plist = g_slist_insert_sorted(*plist,pc,preview_cache_compare);
}
TempBuf *
gimp_preview_cache_get(GSList **plist,
gint width,
gint height)
{
PreviewNearest pn;
PreviewCache *pc;
/* printf("gimp_preview_cache_get %d %d\n",width,height); */
g_slist_foreach(*plist,preview_cache_print,NULL);
pn.pc = NULL;
pn.width = width;
pn.height = height;
g_slist_foreach(*plist,preview_cache_find_exact,&pn);
if(pn.pc && pn.pc->preview)
{
/* printf("extact value w,h [%d,%d] => %p\n",pn.pc->width,pn.pc->height,pn.pc->preview); */
return pn.pc->preview;
}
g_slist_foreach(*plist,preview_cache_find_biggest,&pn);
if(pn.pc)
{
gint pwidth;
gint pheight;
gdouble x_ratio;
gdouble y_ratio;
guchar *src_data;
guchar *dest_data;
gint loop1,loop2;
/* printf("nearest value w,h [%d,%d] => %p\n",pn.pc->width,pn.pc->height,pn.pc->preview); */
/* if(pn.pc->width == width && */
/* pn.pc->height == height) */
/* return pn.pc->preview; */
if(!pn.pc->preview)
{
g_error("gimp_preview_cache_get:: Invalid cache item");
return NULL;
}
/* Make up new preview from the large one... */
pwidth = pn.pc->preview->width;
pheight = pn.pc->preview->height;
/* Now get the real one and add to cache */
/* printf("Must create from large preview\n"); */
pc = g_new0(PreviewCache,1);
pc->preview = temp_buf_new(width,height,pn.pc->preview->bytes,0,0,NULL);
/* preview from nearest bigger one */
x_ratio = (gdouble)pwidth/(gdouble)width;
y_ratio = (gdouble)pheight/(gdouble)height;
src_data = temp_buf_data(pn.pc->preview);
dest_data = temp_buf_data(pc->preview);
/* printf("x_ratio , y_ratio [%f,%f]\n",x_ratio,y_ratio); */
for(loop1 = 0 ; loop1 < height ; loop1++)
for(loop2 = 0 ; loop2 < width ; loop2++)
{
int i;
guchar *src_pixel = src_data +
((gint)(loop2*x_ratio))*pn.pc->preview->bytes +
((gint)(loop1*y_ratio))*pwidth*pn.pc->preview->bytes;
guchar *dest_pixel = dest_data +
(loop2+loop1*width)*pn.pc->preview->bytes;
for(i = 0 ; i < pn.pc->preview->bytes; i++)
*dest_pixel++ = *src_pixel++;
}
pc->width = width;
pc->height = height;
*plist = g_slist_insert_sorted(*plist,pc,preview_cache_compare);
/* printf("New preview created [%d,%d] => %p\n",pc->width,pc->height,pc->preview); */
return pc->preview;
}
/* printf("gimp_preview_cache_get returning NULL\n"); */
return NULL;
}