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gimp/app/base/temp-buf.c

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/* The GIMP -- an image manipulation program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* 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 "config.h"
#include <glib.h>
#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#ifdef G_OS_WIN32
#include <process.h> /* For _getpid() */
#endif
#include "libgimpcolor/gimpcolor.h"
#include "base-types.h"
#include "base-config.h"
#include "pixel-region.h"
#include "temp-buf.h"
#include "paint-funcs/paint-funcs.h"
static guchar * temp_buf_allocate (guint);
static void temp_buf_to_color (TempBuf *src_buf,
TempBuf *dest_buf);
static void temp_buf_to_gray (TempBuf *src_buf,
TempBuf *dest_buf);
/* Memory management */
static guchar *
temp_buf_allocate (guint size)
{
guchar *data;
data = g_new (guchar, size);
return data;
}
/* The conversion routines */
static void
temp_buf_to_color (TempBuf *src_buf,
TempBuf *dest_buf)
{
guchar *src;
guchar *dest;
glong num_bytes;
src = temp_buf_data (src_buf);
dest = temp_buf_data (dest_buf);
num_bytes = src_buf->width * src_buf->height;
while (num_bytes--)
{
guchar tmpch;
*dest++ = *src++; /* alpha channel */
*dest++ = tmpch = *src++;
*dest++ = tmpch;
*dest++ = tmpch;
}
}
static void
temp_buf_to_gray (TempBuf *src_buf,
TempBuf *dest_buf)
{
guchar *src;
guchar *dest;
glong num_bytes;
gfloat pix;
src = temp_buf_data (src_buf);
dest = temp_buf_data (dest_buf);
num_bytes = src_buf->width * src_buf->height;
while (num_bytes--)
{
*dest++ = *src++; /* alpha channel */
pix = INTENSITY (*src++, *src++, *src++);
*dest++ = (guchar) pix;
}
}
TempBuf *
temp_buf_new (gint width,
gint height,
gint bytes,
gint x,
gint y,
guchar *col)
{
glong i;
gint j;
guchar *data;
TempBuf *temp;
temp = g_new (TempBuf, 1);
temp->width = width;
temp->height = height;
temp->bytes = bytes;
temp->x = x;
temp->y = y;
temp->swapped = FALSE;
temp->filename = NULL;
temp->data = data = temp_buf_allocate (width * height * bytes);
/* initialize the data */
if (col)
{
/* First check if we can save a lot of work */
if (bytes == 1)
{
memset (data, *col, width * height);
}
else if ((bytes == 3) && (col[1] == *col) && (*col == col[2]))
{
memset (data, *col, width * height * 3);
}
else if ((bytes == 4) &&
(col[1] == *col) && (*col == col[2]) && (col[2] == col[3]))
{
memset (data, *col, (width * height) << 2);
}
else
{
/* No, we cannot */
guchar *dptr;
/* Fill the first row */
dptr = data;
for (i = width - 1; i >= 0; --i)
{
guchar *init;
j = bytes;
init = col;
while (j--)
*dptr++ = *init++;
}
/* Now copy from it (we set bytes to bytesperrow now) */
bytes *= width;
while (--height)
{
memcpy (dptr, data, bytes);
dptr += bytes;
}
}
}
return temp;
}
/* This function simply renders a checkerboard with the given
parameters into a newly allocated tempbuf */
TempBuf *
temp_buf_new_check (gint width,
gint height,
GimpCheckType check_type,
GimpCheckSize check_size)
{
TempBuf *newbuf = NULL;
guchar *data = 0;
guchar check_shift = 0;
guchar fg_color = 0;
guchar bg_color = 0;
gint j, i = 0;
if (check_type < LIGHT_CHECKS || check_type > BLACK_ONLY)
g_error ("invalid check_type argument to temp_buf_check: %d", check_type);
if (check_size < SMALL_CHECKS || check_size > LARGE_CHECKS)
g_error ("invalid check_size argument to temp_buf_check: %d", check_size);
switch (check_size)
{
case SMALL_CHECKS:
check_shift = 2;
break;
case MEDIUM_CHECKS:
check_shift = 4;
break;
case LARGE_CHECKS:
check_shift = 6;
}
switch (check_type)
{
case LIGHT_CHECKS:
fg_color = 204;
bg_color = 255;
break;
case GRAY_CHECKS:
fg_color = 102;
bg_color = 153;
break;
case DARK_CHECKS:
fg_color = 0;
bg_color = 51;
break;
case WHITE_ONLY:
fg_color = 255;
bg_color = 255;
break;
case GRAY_ONLY:
fg_color = 127;
bg_color = 127;
break;
case BLACK_ONLY:
fg_color = 0;
bg_color = 0;
}
newbuf = temp_buf_new (width, height, 3, 0, 0, NULL);
data = temp_buf_data (newbuf);
for (j = 1; i <= height; j++)
{
for (i = 1; i <= width; i++)
{
*(data + i - 1) = ((j & check_shift) && (i & check_shift))
? fg_color : bg_color;
}
}
return newbuf;
}
TempBuf *
temp_buf_copy (TempBuf *src,
TempBuf *dest)
{
TempBuf *new;
glong length;
if (!src)
{
g_message ("trying to copy a temp buf which is NULL.");
return dest;
}
if (!dest)
{
new = temp_buf_new (src->width, src->height, src->bytes, 0, 0, NULL);
}
else
{
new = dest;
if (dest->width != src->width || dest->height != src->height)
g_message ("In temp_buf_copy, the widths or heights don't match.");
/* The temp buf is smart, and can translate between color and gray */
/* (only necessary if not we allocated it */
if (src->bytes != new->bytes)
{
if (src->bytes == 4) /* RGB color */
temp_buf_to_gray (src, new);
else if (src->bytes == 2) /* grayscale */
temp_buf_to_color (src, new);
else
g_message ("Cannot convert from indexed color.");
return new;
}
}
/* make the copy */
length = src->width * src->height * src->bytes;
memcpy (temp_buf_data (new), temp_buf_data (src), length);
return new;
}
TempBuf *
temp_buf_resize (TempBuf *buf,
gint bytes,
gint x,
gint y,
gint width,
gint height)
{
gint size;
/* calculate the requested size */
size = width * height * bytes;
/* First, configure the canvas buffer */
if (!buf)
{
buf = temp_buf_new (width, height, bytes, x, y, NULL);
}
else
{
if (size != (buf->width * buf->height * buf->bytes))
{
/* Make sure the temp buf is unswapped */
temp_buf_unswap (buf);
/* Reallocate the data for it */
buf->data = g_realloc (buf->data, size);
}
/* Make sure the temp buf fields are valid */
buf->x = x;
buf->y = y;
buf->width = width;
buf->height = height;
buf->bytes = bytes;
}
return buf;
}
TempBuf *
temp_buf_scale (TempBuf *src,
gint new_width,
gint new_height)
{
gint loop1;
gint loop2;
gdouble x_ratio;
gdouble y_ratio;
guchar *src_data;
guchar *dest_data;
TempBuf *dest;
dest = temp_buf_new (new_width,
new_height,
src->bytes,
0, 0, NULL);
src_data = temp_buf_data (src);
dest_data = temp_buf_data (dest);
x_ratio = (gdouble) src->width / (gdouble) new_width;
y_ratio = (gdouble) src->height / (gdouble) new_height;
for (loop1 = 0 ; loop1 < new_height ; loop1++)
{
for (loop2 = 0 ; loop2 < new_width ; loop2++)
{
gint i;
guchar *src_pixel;
guchar *dest_pixel;
src_pixel = src_data +
(gint) (loop2 * x_ratio) * src->bytes +
(gint) (loop1 * y_ratio) * src->bytes * src->width;
dest_pixel = dest_data +
(loop2 + loop1 * new_width) * src->bytes;
for (i = 0 ; i < src->bytes; i++)
*dest_pixel++ = *src_pixel++;
}
}
return dest;
}
TempBuf *
temp_buf_copy_area (TempBuf *src,
TempBuf *dest,
gint x,
gint y,
gint width,
gint height,
gint dest_x,
gint dest_y)
{
TempBuf *new;
PixelRegion srcR, destR;
guchar empty[MAX_CHANNELS] = { 0, 0, 0, 0 };
gint x1, y1, x2, y2;
g_return_val_if_fail (src != NULL, dest);
g_return_val_if_fail (!dest || dest->bytes == src->bytes, dest);
g_return_val_if_fail (width + dest_x > 0, dest);
g_return_val_if_fail (height + dest_y > 0, dest);
g_return_val_if_fail (!dest || dest->width >= width + dest_x, dest);
g_return_val_if_fail (!dest || dest->height >= height + dest_y, dest);
/* some bounds checking */
x1 = CLAMP (x, 0, src->width - 1);
y1 = CLAMP (y, 0, src->height - 1);
x2 = CLAMP (x + width - 1, 0, src->width - 1);
y2 = CLAMP (y + height - 1, 0, src->height - 1);
if (!(x2 - x1) || !(y2 - y1))
return dest;
width = x2 - x1 + 1;
height = y2 - y1 + 1;
if (! dest)
{
new = temp_buf_new (width + dest_x,
height + dest_y,
src->bytes,
0, 0,
empty);
}
else
{
new = dest;
}
/* Copy the region */
srcR.bytes = src->bytes;
srcR.w = width;
srcR.h = height;
srcR.rowstride = src->bytes * src->width;
srcR.data = (temp_buf_data (src) +
y1 * srcR.rowstride +
x1 * srcR.bytes);
destR.bytes = dest->bytes;
destR.rowstride = new->bytes * new->width;
destR.data = (temp_buf_data (new) +
dest_y * destR.rowstride +
dest_x * destR.bytes);
copy_region (&srcR, &destR);
return new;
}
void
temp_buf_free (TempBuf *temp_buf)
{
if (temp_buf->data)
g_free (temp_buf->data);
if (temp_buf->swapped)
temp_buf_swap_free (temp_buf);
g_free (temp_buf);
}
guchar *
temp_buf_data (TempBuf *temp_buf)
{
if (temp_buf->swapped)
temp_buf_unswap (temp_buf);
return temp_buf->data;
}
guchar *
temp_buf_data_clear (TempBuf *temp_buf)
{
if (temp_buf->swapped)
temp_buf_unswap (temp_buf);
memset (temp_buf->data, 0,
temp_buf->height * temp_buf->width * temp_buf->bytes);
return temp_buf->data;
}
/******************************************************************
* Mask buffer functions *
******************************************************************/
MaskBuf *
mask_buf_new (gint width,
gint height)
{
static guchar empty = 0;
return temp_buf_new (width, height, 1, 0, 0, &empty);
}
void
mask_buf_free (MaskBuf *mask)
{
temp_buf_free ((TempBuf *) mask);
}
guchar *
mask_buf_data (MaskBuf *mask_buf)
{
return temp_buf_data ((TempBuf *) mask_buf);
}
guchar *
mask_buf_data_clear (MaskBuf *mask_buf)
{
return temp_buf_data_clear ((TempBuf *) mask_buf);
}
/******************************************************************
* temp buffer disk caching functions *
******************************************************************/
/* NOTES:
* Disk caching is setup as follows:
* On a call to temp_buf_swap, the TempBuf parameter is stored
* in a temporary variable called cached_in_memory.
* On the next call to temp_buf_swap, if cached_in_memory is non-null,
* cached_in_memory is moved to disk, and the latest TempBuf parameter
* is stored in cached_in_memory. This method keeps the latest TempBuf
* structure in memory instead of moving it directly to disk as requested.
* On a call to temp_buf_unswap, if cached_in_memory is non-null, it is
* compared against the requested TempBuf. If they are the same, nothing
* must be moved in from disk since it still resides in memory. However,
* if the two pointers are different, the requested TempBuf is retrieved
* from disk. In the former case, cached_in_memory is set to NULL;
* in the latter case, cached_in_memory is left unchanged.
* If temp_buf_swap_free is called, cached_in_memory must be checked
* against the temp buf being freed. If they are the same, then
* cached_in_memory must be set to NULL;
*
* In the case where memory usage is set to "stingy":
* temp bufs are not cached in memory at all, they go right to disk.
*/
/* a static counter for generating unique filenames */
static gint swap_index = 0;
/* a static pointer which keeps track of the last request for a swapped buffer */
static TempBuf * cached_in_memory = NULL;
static gchar *
generate_unique_filename (void)
{
pid_t pid;
pid = getpid ();
return g_strdup_printf ("%s" G_DIR_SEPARATOR_S "gimp%d.%d",
base_config->temp_path,
(gint) pid,
swap_index++);
}
void
temp_buf_swap (TempBuf *buf)
{
TempBuf *swap;
gchar *filename;
struct stat stat_buf;
gint err;
FILE *fp;
if (!buf || buf->swapped)
return;
/* Set the swapped flag */
buf->swapped = TRUE;
if (base_config->stingy_memory_use)
swap = buf;
else
{
swap = cached_in_memory;
cached_in_memory = buf;
}
/* For the case where there is no temp buf ready to be moved to disk, return */
if (!swap)
return;
/* Get a unique filename for caching the data to a UNIX file */
filename = generate_unique_filename ();
/* Check if generated filename is valid */
err = stat (filename, &stat_buf);
if (!err)
{
if (stat_buf.st_mode & S_IFDIR)
{
g_message ("Error in temp buf caching: \"%s\" is a directory (cannot overwrite)", filename);
g_free (filename);
return;
}
}
/* Open file for overwrite */
if ((fp = fopen (filename, "wb")))
{
size_t blocks_written;
blocks_written = fwrite (swap->data, swap->width * swap->height * swap->bytes, 1, fp);
/* Check whether all bytes were written and fclose() was able to flush its buffers */
if ((0 != fclose (fp)) || (1 != blocks_written))
{
(void) unlink (filename);
perror ("Write error on temp buf");
g_message ("Cannot write \"%s\"", filename);
g_free (filename);
return;
}
}
else
{
(void) unlink (filename);
perror ("Error in temp buf caching");
g_message ("Cannot write \"%s\"", filename);
g_free (filename);
return;
}
/* Finally, free the buffer's data */
g_free (swap->data);
swap->data = NULL;
swap->filename = filename;
}
void
temp_buf_unswap (TempBuf *buf)
{
struct stat stat_buf;
FILE *fp;
gboolean succ = FALSE;
if (!buf || !buf->swapped)
return;
/* Set the swapped flag */
buf->swapped = FALSE;
/* If the requested temp buf is still in memory, simply return */
if (cached_in_memory == buf)
{
cached_in_memory = NULL;
return;
}
/* Allocate memory for the buffer's data */
buf->data = temp_buf_allocate (buf->width * buf->height * buf->bytes);
/* Find out if the filename of the swapped data is an existing file... */
/* (buf->filname HAS to be != 0 */
if (!stat (buf->filename, &stat_buf))
{
if ((fp = fopen (buf->filename, "rb")))
{
size_t blocks_read;
blocks_read = fread (buf->data, buf->width * buf->height * buf->bytes, 1, fp);
(void) fclose (fp);
if (blocks_read != 1)
perror ("Read error on temp buf");
else
succ = TRUE;
}
else
perror ("Error in temp buf caching");
/* Delete the swap file */
unlink (buf->filename);
}
if (!succ)
g_message ("Error in temp buf caching: information swapped to disk was lost!");
g_free (buf->filename); /* free filename */
buf->filename = NULL;
}
void
temp_buf_swap_free (TempBuf *buf)
{
struct stat stat_buf;
if (!buf->swapped)
return;
/* Set the swapped flag */
buf->swapped = FALSE;
/* If the requested temp buf is cached in memory... */
if (cached_in_memory == buf)
{
cached_in_memory = NULL;
return;
}
/* Find out if the filename of the swapped data is an existing file... */
if (!stat (buf->filename, &stat_buf))
{
/* Delete the swap file */
unlink (buf->filename);
}
else
g_message ("Error in temp buf disk swapping: information swapped to disk was lost!");
if (buf->filename)
g_free (buf->filename); /* free filename */
buf->filename = NULL;
}
void
swapping_free (void)
{
if (cached_in_memory)
temp_buf_free (cached_in_memory);
}
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