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gimp/app/pixel_region.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 <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include "appenv.h"
#include "pixel_region.h"
#include "tile_manager_pvt.h"
#include "tile.h" /* ick. */
typedef struct _PixelRegionHolder PixelRegionHolder;
struct _PixelRegionHolder
{
PixelRegion *PR;
unsigned char *original_data;
int startx, starty;
int count;
};
typedef struct _PixelRegionIterator PixelRegionIterator;
struct _PixelRegionIterator
{
GSList *pixel_regions;
int region_width;
int region_height;
int portion_width;
int portion_height;
int process_count;
};
/*********************/
/* Local Variables */
/*********************/
/* Local Functions */
static int get_portion_width (PixelRegionIterator *);
static int get_portion_height (PixelRegionIterator *);
static void * pixel_regions_configure (PixelRegionIterator *);
static void pixel_region_configure (PixelRegionHolder *, PixelRegionIterator *);
/**************************/
/* Function definitions */
void
pixel_region_init (PR, tiles, x, y, w, h, dirty)
PixelRegion *PR;
TileManager *tiles;
int x, y;
int w, h;
int dirty;
{
PR->tiles = tiles;
PR->curtile = NULL;
PR->data = NULL;
PR->bytes = tiles->bpp;
PR->rowstride = PR->bytes * TILE_WIDTH;
PR->x = x;
PR->y = y;
PR->w = w;
PR->h = h;
PR->dirty = dirty;
}
void
pixel_region_resize (PR, x, y, w, h)
PixelRegion *PR;
int x, y;
int w, h;
{
/* If the data is non-null, data is contiguous--need to advance */
if (PR->data != NULL)
{
PR->data += (y - PR->y) * PR->rowstride + (x - PR->x) * PR->bytes;
}
/* update sizes for both contiguous and tiled regions */
PR->x = x;
PR->y = y;
PR->w = w;
PR->h = h;
}
/* request that tiles within a region be fetched asynchronously
*/
void
pixel_region_get_async (PR, ulx, uly, lrx, lry)
PixelRegion *PR;
int ulx;
int uly;
int lrx;
int lry;
{
int x, y;
for (y = uly; y < lry; y += TILE_HEIGHT)
for (x = ulx; x < lrx; x += TILE_WIDTH)
tile_manager_get_async (PR->tiles, x, y);
}
void
pixel_region_get_row (PR, x, y, w, data, subsample)
PixelRegion *PR;
int x, y;
int w;
unsigned char *data;
int subsample;
{
Tile *tile;
unsigned char *tile_data;
int inc;
int end;
int boundary;
int b;
int npixels;
end = x + w;
pixel_region_get_async (PR, x, y, end, y);
while (x < end)
{
tile = tile_manager_get_tile (PR->tiles, x, y, TRUE, FALSE);
tile_data = tile_data_pointer (tile, x % TILE_WIDTH, y % TILE_HEIGHT);
npixels = tile_ewidth (tile) - (x % TILE_WIDTH);
if ((x + npixels) > end) /* make sure we don't write past the end */
npixels = end - x;
if (subsample == 1) /* optimize for the common case */
{
memcpy(data, tile_data, tile_bpp(tile)*npixels);
data += tile_bpp(tile)*npixels;
x += npixels;
}
else
{
boundary = x + npixels;
inc = subsample * tile_bpp(tile);
for ( ; x < boundary; x += subsample)
{
for (b = 0; b < tile_bpp(tile); b++)
*data++ = tile_data[b];
tile_data += inc;
}
}
tile_release (tile, FALSE);
}
}
void
pixel_region_set_row (PR, x, y, w, data)
PixelRegion *PR;
int x, y;
int w;
unsigned char *data;
{
Tile *tile;
unsigned char *tile_data;
int end;
int npixels;
end = x + w;
pixel_region_get_async (PR, x, y, end, y);
while (x < end)
{
tile = tile_manager_get_tile (PR->tiles, x, y, TRUE, TRUE);
tile_data = tile_data_pointer (tile, x % TILE_WIDTH, y % TILE_HEIGHT);
npixels = tile_ewidth(tile) - (x % TILE_WIDTH);
if ((x + npixels) > end) /* make sure we don't write past the end */
npixels = end - x;
memcpy(tile_data, data, tile_bpp(tile)*npixels);
data += tile_bpp(tile)*npixels;
x += npixels;
tile_release (tile, TRUE);
}
}
void
pixel_region_get_col (PR, x, y, h, data, subsample)
PixelRegion *PR;
int x, y;
int h;
unsigned char *data;
int subsample;
{
Tile *tile;
unsigned char *tile_data;
int inc;
int end;
int boundary;
int b;
end = y + h;
pixel_region_get_async (PR, x, y, x, end);
while (y < end)
{
tile = tile_manager_get_tile (PR->tiles, x, y, TRUE, FALSE);
tile_data = tile_data_pointer (tile, x % TILE_WIDTH, y % TILE_HEIGHT);
boundary = y + (tile_eheight(tile) - (y % TILE_HEIGHT));
if (boundary > end) /* make sure we don't write past the end */
boundary = end;
inc = subsample * tile_bpp(tile) * tile_ewidth(tile);
for ( ; y < boundary; y += subsample)
{
for (b = 0; b < tile_bpp(tile); b++)
*data++ = tile_data[b];
tile_data += inc;
}
tile_release (tile, FALSE);
}
}
void
pixel_region_set_col (PR, x, y, h, data)
PixelRegion *PR;
int x, y;
int h;
unsigned char *data;
{
Tile *tile;
unsigned char *tile_data;
int inc;
int end;
int boundary;
int b;
end = y + h;
pixel_region_get_async (PR, x, y, x, end);
while (y < end)
{
tile = tile_manager_get_tile (PR->tiles, x, y, TRUE, TRUE);
tile_data = tile_data_pointer (tile, x % TILE_WIDTH, y % TILE_HEIGHT);
boundary = y + (tile_eheight(tile) - (y % TILE_HEIGHT));
inc = tile_bpp(tile) * tile_ewidth(tile);
if (boundary > end) /* make sure we don't write past the end */
boundary = end;
for ( ; y < boundary; y++)
{
for (b = 0; b < tile_bpp(tile); b++)
tile_data[b] = *data++;
tile_data += inc;
}
tile_release (tile, TRUE);
}
}
void *
pixel_regions_register (int num_regions, ...)
{
PixelRegion *PR;
PixelRegionHolder *PRH;
PixelRegionIterator *PRI;
int found;
va_list ap;
PRI = (PixelRegionIterator *) g_malloc (sizeof (PixelRegionIterator));
PRI->pixel_regions = NULL;
PRI->process_count = 0;
if (num_regions < 1)
return FALSE;
va_start (ap, num_regions);
found = FALSE;
while (num_regions --)
{
PR = va_arg (ap, PixelRegion *);
PRH = (PixelRegionHolder *) g_malloc (sizeof (PixelRegionHolder));
PRH->PR = PR;
if (PR != NULL)
{
/* If there is a defined value for data, make sure tiles is NULL */
if (PR->data)
PR->tiles = NULL;
PRH->original_data = PR->data;
PRH->startx = PR->x;
PRH->starty = PR->y;
PRH->PR->process_count = 0;
if (!found)
{
found = TRUE;
PRI->region_width = PR->w;
PRI->region_height = PR->h;
}
}
/* Add the pixel region holder to the list */
PRI->pixel_regions = g_slist_prepend (PRI->pixel_regions, PRH);
}
va_end (ap);
return pixel_regions_configure (PRI);
}
void *
pixel_regions_process (PRI_ptr)
void *PRI_ptr;
{
GSList *list;
PixelRegionHolder *PRH;
PixelRegionIterator *PRI;
PRI = (PixelRegionIterator *) PRI_ptr;
PRI->process_count++;
/* Unref all referenced tiles and increment the offsets */
list = PRI->pixel_regions;
while (list)
{
PRH = (PixelRegionHolder *) list->data;
if ((PRH->PR != NULL) && (PRH->PR->process_count != PRI->process_count))
{
/* This eliminates the possibility of incrementing the
* same region twice
*/
PRH->PR->process_count++;
/* Unref the last referenced tile if the underlying region is a tile manager */
if (PRH->PR->tiles)
{
tile_release (PRH->PR->curtile, PRH->PR->dirty);
PRH->PR->curtile = NULL;
}
PRH->PR->x += PRI->portion_width;
if ((PRH->PR->x - PRH->startx) >= PRI->region_width)
{
PRH->PR->x = PRH->startx;
PRH->PR->y += PRI->portion_height;
}
}
list = g_slist_next (list);
}
return pixel_regions_configure (PRI);
}
void
pixel_regions_process_stop (PRI_ptr)
void *PRI_ptr;
{
GSList *list;
PixelRegionHolder *PRH;
PixelRegionIterator *PRI;
PRI = (PixelRegionIterator *) PRI_ptr;
PRI->process_count++;
/* Unref all referenced tiles and increment the offsets */
list = PRI->pixel_regions;
while (list)
{
PRH = (PixelRegionHolder *) list->data;
if ((PRH->PR != NULL) && (PRH->PR->process_count != PRI->process_count))
{
/* This eliminates the possibility of incrementing the
* same region twice
*/
PRH->PR->process_count++;
/* Unref the last referenced tile if the underlying region is a tile manager */
if (PRH->PR->tiles)
{
tile_release (PRH->PR->curtile, PRH->PR->dirty);
PRH->PR->curtile = NULL;
}
}
list = g_slist_next (list);
}
if (PRI->pixel_regions)
{
list = PRI->pixel_regions;
while (list)
{
g_free (list->data);
list = g_slist_next (list);
}
g_slist_free (PRI->pixel_regions);
g_free (PRI);
}
}
/*********************************/
/* Static Function Definitions */
static int
get_portion_height (PRI)
PixelRegionIterator *PRI;
{
GSList *list;
PixelRegionHolder *PRH;
int min_height = G_MAXINT;
int height;
/* Find the minimum height to the next vertical tile (in the case of a tile manager)
* or to the end of the pixel region (in the case of no tile manager)
*/
list = PRI->pixel_regions;
while (list)
{
PRH = (PixelRegionHolder *) list->data;
if (PRH->PR)
{
/* Check if we're past the point of no return */
if ((PRH->PR->y - PRH->starty) >= PRI->region_height)
return 0;
if (PRH->PR->tiles)
{
height = TILE_HEIGHT - (PRH->PR->y % TILE_HEIGHT);
height = BOUNDS (height, 0, (PRI->region_height - (PRH->PR->y - PRH->starty)));
}
else
height = (PRI->region_height - (PRH->PR->y - PRH->starty));
if (height < min_height)
min_height = height;
}
list = g_slist_next (list);
}
return min_height;
}
static int
get_portion_width (PRI)
PixelRegionIterator *PRI;
{
GSList *list;
PixelRegionHolder *PRH;
int min_width = G_MAXINT;
int width;
/* Find the minimum width to the next vertical tile (in the case of a tile manager)
* or to the end of the pixel region (in the case of no tile manager)
*/
list = PRI->pixel_regions;
while (list)
{
PRH = (PixelRegionHolder *) list->data;
if (PRH->PR)
{
/* Check if we're past the point of no return */
if ((PRH->PR->x - PRH->startx) >= PRI->region_width)
return 0;
if (PRH->PR->tiles)
{
width = TILE_WIDTH - (PRH->PR->x % TILE_WIDTH);
width = BOUNDS (width, 0, (PRI->region_width - (PRH->PR->x - PRH->startx)));
}
else
width = (PRI->region_width - (PRH->PR->x - PRH->startx));
if (width < min_width)
min_width = width;
}
list = g_slist_next (list);
}
return min_width;
}
static void *
pixel_regions_configure (PRI)
PixelRegionIterator *PRI;
{
PixelRegionHolder *PRH;
GSList *list;
/* Determine the portion width and height */
PRI->portion_width = get_portion_width (PRI);
PRI->portion_height = get_portion_height (PRI);
if (PRI->portion_width == 0 || PRI->portion_height == 0)
{
/* free the pixel regions list */
if (PRI->pixel_regions)
{
list = PRI->pixel_regions;
while (list)
{
g_free (list->data);
list = g_slist_next (list);
}
g_slist_free (PRI->pixel_regions);
g_free (PRI);
}
return NULL;
}
PRI->process_count++;
list = PRI->pixel_regions;
while (list)
{
PRH = (PixelRegionHolder *) list->data;
if ((PRH->PR != NULL) && (PRH->PR->process_count != PRI->process_count))
{
PRH->PR->process_count++;
pixel_region_configure (PRH, PRI);
}
list = g_slist_next (list);
}
return PRI;
}
static void
pixel_region_configure (PRH, PRI)
PixelRegionHolder *PRH;
PixelRegionIterator *PRI;
{
/* Configure the rowstride and data pointer for the pixel region
* based on the current offsets into the region and whether the
* region is represented by a tile manager or not
*/
if (PRH->PR->tiles)
{
PRH->PR->curtile = tile_manager_get_tile (PRH->PR->tiles, PRH->PR->x, PRH->PR->y, TRUE, PRH->PR->dirty);
PRH->PR->offx = PRH->PR->x % TILE_WIDTH;
PRH->PR->offy = PRH->PR->y % TILE_HEIGHT;
PRH->PR->rowstride = tile_ewidth(PRH->PR->curtile) * PRH->PR->bytes;
PRH->PR->data = tile_data_pointer(PRH->PR->curtile,
PRH->PR->offx, PRH->PR->offy);
}
else
{
PRH->PR->data = PRH->original_data +
(PRH->PR->y - PRH->starty) * PRH->PR->rowstride +
(PRH->PR->x - PRH->startx) * PRH->PR->bytes;
}
PRH->PR->w = PRI->portion_width;
PRH->PR->h = PRI->portion_height;
}
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