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gimp/app/base/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 "config.h"
#include <stdarg.h>
#include <string.h>
#include <glib-object.h>
#include "base-types.h"
#include "pixel-region.h"
#include "temp-buf.h"
#include "tile-manager.h"
#include "tile.h"
/*********************/
/* Local Functions */
static gint get_portion_width (PixelRegionIterator *PRI);
static gint get_portion_height (PixelRegionIterator *PRI);
static PixelRegionIterator * pixel_regions_configure (PixelRegionIterator *PRI);
static void pixel_region_configure (PixelRegionHolder *PRH,
PixelRegionIterator *PRI);
/**************************/
/* Function definitions */
void
pixel_region_init (PixelRegion *PR,
TileManager *tiles,
gint x,
gint y,
gint w,
gint h,
gboolean dirty)
{
PR->data = NULL;
PR->tiles = tiles;
PR->curtile = NULL;
PR->offx = 0;
PR->offy = 0;
PR->bytes = tile_manager_bpp (tiles);
PR->rowstride = PR->bytes * TILE_WIDTH;
PR->x = x;
PR->y = y;
PR->w = w;
PR->h = h;
PR->dirty = dirty;
PR->process_count = 0;
}
void
pixel_region_init_temp_buf (PixelRegion *PR,
TempBuf *temp_buf,
gint x,
gint y,
gint w,
gint h)
{
PR->data = temp_buf_data (temp_buf);
PR->tiles = NULL;
PR->curtile = NULL;
PR->offx = 0;
PR->offy = 0;
PR->bytes = temp_buf->bytes;
PR->rowstride = temp_buf->width * temp_buf->bytes;
PR->x = x;
PR->y = y;
PR->w = w;
PR->h = h;
PR->dirty = FALSE;
PR->process_count = 0;
}
void
pixel_region_init_data (PixelRegion *PR,
guchar *data,
gint bytes,
gint rowstride,
gint x,
gint y,
gint w,
gint h)
{
PR->data = data;
PR->tiles = NULL;
PR->curtile = NULL;
PR->offx = 0;
PR->offy = 0;
PR->bytes = bytes;
PR->rowstride = rowstride;
PR->x = x;
PR->y = y;
PR->w = w;
PR->h = h;
PR->dirty = FALSE;
PR->process_count = 0;
}
void
pixel_region_resize (PixelRegion *PR,
gint x,
gint y,
gint w,
gint 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;
}
void
pixel_region_get_row (PixelRegion *PR,
gint x,
gint y,
gint w,
guchar *data,
gint subsample)
{
Tile *tile;
guchar *tile_data;
gint inc;
gint end;
gint boundary;
gint b;
gint npixels;
gint bpp;
end = x + w;
bpp = tile_manager_bpp (PR->tiles);
inc = subsample * bpp;
if (subsample == 1)
{
read_pixel_data (PR->tiles, x, y, end - 1, y, data, bpp);
}
else
{
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;
boundary = x + npixels;
for ( ; x < boundary; x += subsample)
{
for (b = 0; b < bpp; b++)
*data++ = tile_data[b];
tile_data += inc;
}
tile_release (tile, FALSE);
}
}
}
void
pixel_region_set_row (PixelRegion *PR,
gint x,
gint y,
gint w,
const guchar *data)
{
gint end = x + w;
gint bpp = tile_manager_bpp (PR->tiles);
write_pixel_data (PR->tiles, x, y, end - 1, y, data, bpp);
}
void
pixel_region_get_col (PixelRegion *PR,
gint x,
gint y,
gint h,
guchar *data,
gint subsample)
{
Tile *tile;
guchar *tile_data;
gint bpp;
gint inc;
gint end;
gint boundary;
gint b;
end = y + h;
bpp = tile_manager_bpp (PR->tiles);
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 * bpp * tile_ewidth (tile);
for ( ; y < boundary; y += subsample)
{
for (b = 0; b < bpp; b++)
*data++ = tile_data[b];
tile_data += inc;
}
tile_release (tile, FALSE);
}
}
void
pixel_region_set_col (PixelRegion *PR,
gint x,
gint y,
gint h,
const guchar *data)
{
gint end = y + h;
gint bpp = tile_manager_bpp (PR->tiles);
write_pixel_data (PR->tiles, x, y, x, end-1, data, bpp);
}
gboolean
pixel_region_has_alpha (PixelRegion *PR)
{
if (PR->bytes == 2 || PR->bytes == 4)
return TRUE;
else
return FALSE;
}
PixelRegionIterator *
pixel_regions_register (gint num_regions,
...)
{
PixelRegionIterator *PRI;
gboolean found;
va_list ap;
if (num_regions < 1)
return NULL;
PRI = g_new0 (PixelRegionIterator, 1);
PRI->dirty_tiles = 1;
va_start (ap, num_regions);
found = FALSE;
while (num_regions --)
{
PixelRegionHolder *PRH;
PixelRegion *PR;
PR = va_arg (ap, PixelRegion *);
PRH = g_new0 (PixelRegionHolder, 1);
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);
}
PixelRegionIterator *
pixel_regions_process (PixelRegionIterator *PRI)
{
GSList *list;
PRI->process_count++;
/* Unref all referenced tiles and increment the offsets */
for (list = PRI->pixel_regions; list; list = g_slist_next (list))
{
PixelRegionHolder *PRH = 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)
{
/* only set the dirty flag if PRH->dirty_tiles == TRUE */
tile_release (PRH->PR->curtile,
PRH->PR->dirty && PRI->dirty_tiles);
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;
}
}
}
return pixel_regions_configure (PRI);
}
void
pixel_regions_process_stop (PixelRegionIterator *PRI)
{
GSList *list;
PRI->process_count++;
/* Unref all referenced tiles and increment the offsets */
for (list = PRI->pixel_regions; list; list = g_slist_next (list))
{
PixelRegionHolder *PRH = 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;
}
}
}
if (PRI->pixel_regions)
{
for (list = PRI->pixel_regions; list; list = g_slist_next (list))
g_free (list->data);
g_slist_free (PRI->pixel_regions);
g_free (PRI);
}
}
/*********************************/
/* Static Function Definitions */
static gint
get_portion_height (PixelRegionIterator *PRI)
{
GSList *list;
gint min_height = G_MAXINT;
gint 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)
*/
for (list = PRI->pixel_regions; list; list = g_slist_next (list))
{
PixelRegionHolder *PRH = 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 = CLAMP (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;
}
}
return min_height;
}
static gint
get_portion_width (PixelRegionIterator *PRI)
{
GSList *list;
gint min_width = G_MAXINT;
gint 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)
*/
for (list = PRI->pixel_regions; list; list = g_slist_next (list))
{
PixelRegionHolder *PRH = 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 = CLAMP (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;
}
}
return min_width;
}
static PixelRegionIterator *
pixel_regions_configure (PixelRegionIterator *PRI)
{
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)
{
for (list = PRI->pixel_regions; list; list = g_slist_next (list))
g_free (list->data);
g_slist_free (PRI->pixel_regions);
g_free (PRI);
}
return NULL;
}
PRI->process_count++;
for (list = PRI->pixel_regions; list; list = g_slist_next (list))
{
PixelRegionHolder *PRH = list->data;
if ((PRH->PR != NULL) && (PRH->PR->process_count != PRI->process_count))
{
PRH->PR->process_count++;
pixel_region_configure (PRH, PRI);
}
}
return PRI;
}
static void
pixel_region_configure (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->PR->rowstride +
PRH->PR->x * PRH->PR->bytes);
}
PRH->PR->w = PRI->portion_width;
PRH->PR->h = PRI->portion_height;
}
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