mirror of https://github.com/GNOME/gimp.git
571 lines
12 KiB
C
571 lines
12 KiB
C
/* The GIMP -- an image manipulation program
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <string.h>
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#include "appenv.h"
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#include "linked.h"
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#include "pixel_region.h"
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typedef struct _PixelRegionHolder PixelRegionHolder;
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struct _PixelRegionHolder
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{
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PixelRegion *PR;
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unsigned char *original_data;
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int startx, starty;
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int count;
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};
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typedef struct _PixelRegionIterator PixelRegionIterator;
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struct _PixelRegionIterator
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{
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link_ptr pixel_regions;
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int region_width;
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int region_height;
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int portion_width;
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int portion_height;
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int process_count;
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};
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/*********************/
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/* Local Variables */
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/*********************/
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/* Local Functions */
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static int get_portion_width (PixelRegionIterator *);
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static int get_portion_height (PixelRegionIterator *);
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static void * pixel_regions_configure (PixelRegionIterator *);
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static void pixel_region_configure (PixelRegionHolder *, PixelRegionIterator *);
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/**************************/
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/* Function definitions */
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void
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pixel_region_init (PR, tiles, x, y, w, h, dirty)
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PixelRegion *PR;
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TileManager *tiles;
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int x, y;
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int w, h;
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int dirty;
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{
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PR->tiles = tiles;
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PR->data = NULL;
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PR->bytes = tiles->levels[0].bpp;
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PR->rowstride = PR->bytes * TILE_WIDTH;
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PR->x = x;
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PR->y = y;
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PR->w = w;
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PR->h = h;
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PR->dirty = dirty;
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}
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void
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pixel_region_resize (PR, x, y, w, h)
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PixelRegion *PR;
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int x, y;
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int w, h;
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{
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/* If the data is non-null, data is contiguous--need to advance */
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if (PR->data != NULL)
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{
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PR->data += (y - PR->y) * PR->rowstride + (x - PR->x) * PR->bytes;
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}
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/* update sizes for both contiguous and tiled regions */
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PR->x = x;
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PR->y = y;
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PR->w = w;
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PR->h = h;
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}
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void
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pixel_region_get_row (PR, x, y, w, data, subsample)
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PixelRegion *PR;
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int x, y;
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int w;
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unsigned char *data;
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int subsample;
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{
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Tile *tile;
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unsigned char *tile_data;
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int inc;
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int end;
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int boundary;
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int b;
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end = x + w;
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while (x < end)
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{
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tile = tile_manager_get_tile (PR->tiles, x, y, 0);
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tile_ref (tile);
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tile_data = tile->data + tile->bpp * (tile->ewidth * (y % TILE_HEIGHT) + (x % TILE_WIDTH));
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boundary = x + (tile->ewidth - (x % TILE_WIDTH));
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inc = subsample * tile->bpp;
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for ( ; x < end && x < boundary; x += subsample)
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{
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for (b = 0; b < tile->bpp; b++)
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*data++ = tile_data[b];
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tile_data += inc;
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}
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tile_unref (tile, FALSE);
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}
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}
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void
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pixel_region_set_row (PR, x, y, w, data)
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PixelRegion *PR;
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int x, y;
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int w;
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unsigned char *data;
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{
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Tile *tile;
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unsigned char *tile_data;
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int end;
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int boundary;
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int b;
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end = x + w;
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while (x < end)
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{
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tile = tile_manager_get_tile (PR->tiles, x, y, 0);
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tile_ref (tile);
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tile_data = tile->data + tile->bpp * (tile->ewidth * (y % TILE_HEIGHT) + (x % TILE_WIDTH));
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boundary = x + (tile->ewidth - (x % TILE_WIDTH));
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for ( ; x < end && x < boundary; x++)
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{
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for (b = 0; b < tile->bpp; b++)
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*tile_data++ = *data++;
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}
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tile_unref (tile, TRUE);
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}
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}
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void
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pixel_region_get_col (PR, x, y, h, data, subsample)
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PixelRegion *PR;
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int x, y;
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int h;
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unsigned char *data;
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int subsample;
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{
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Tile *tile;
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unsigned char *tile_data;
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int inc;
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int end;
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int boundary;
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int b;
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end = y + h;
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while (y < end)
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{
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tile = tile_manager_get_tile (PR->tiles, x, y, 0);
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tile_ref (tile);
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tile_data = tile->data + tile->bpp * (tile->ewidth * (y % TILE_HEIGHT) + (x % TILE_WIDTH));
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boundary = y + (tile->eheight - (y % TILE_HEIGHT));
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inc = subsample * tile->bpp * tile->ewidth;
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for ( ; y < end && y < boundary; y += subsample)
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{
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for (b = 0; b < tile->bpp; b++)
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*data++ = tile_data[b];
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tile_data += inc;
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}
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tile_unref (tile, FALSE);
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}
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}
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void
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pixel_region_set_col (PR, x, y, h, data)
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PixelRegion *PR;
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int x, y;
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int h;
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unsigned char *data;
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{
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Tile *tile;
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unsigned char *tile_data;
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int inc;
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int end;
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int boundary;
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int b;
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end = y + h;
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while (y < end)
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{
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tile = tile_manager_get_tile (PR->tiles, x, y, 0);
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tile_ref (tile);
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tile_data = tile->data + tile->bpp * (tile->ewidth * (y % TILE_HEIGHT) + (x % TILE_WIDTH));
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boundary = y + (tile->eheight - (y % TILE_HEIGHT));
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inc = tile->bpp * tile->ewidth;
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for ( ; y < end && y < boundary; y++)
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{
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for (b = 0; b < tile->bpp; b++)
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tile_data[b] = *data++;
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tile_data += inc;
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}
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tile_unref (tile, TRUE);
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}
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}
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void *
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pixel_regions_register (int num_regions, ...)
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{
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PixelRegion *PR;
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PixelRegionHolder *PRH;
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PixelRegionIterator *PRI;
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int found;
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va_list ap;
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PRI = (PixelRegionIterator *) g_malloc (sizeof (PixelRegionIterator));
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PRI->pixel_regions = NULL;
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PRI->process_count = 0;
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if (num_regions < 1)
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return FALSE;
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va_start (ap, num_regions);
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found = FALSE;
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while (num_regions --)
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{
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PR = va_arg (ap, PixelRegion *);
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PRH = (PixelRegionHolder *) g_malloc (sizeof (PixelRegionHolder));
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PRH->PR = PR;
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if (PR != NULL)
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{
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/* If there is a defined value for data, make sure tiles is NULL */
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if (PR->data)
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PR->tiles = NULL;
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PRH->original_data = PR->data;
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PRH->startx = PR->x;
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PRH->starty = PR->y;
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PRH->PR->process_count = 0;
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if (!found)
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{
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found = TRUE;
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PRI->region_width = PR->w;
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PRI->region_height = PR->h;
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}
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}
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/* Add the pixel region holder to the list */
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PRI->pixel_regions = add_to_list (PRI->pixel_regions, PRH);
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}
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va_end (ap);
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return pixel_regions_configure (PRI);
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}
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void *
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pixel_regions_process (PRI_ptr)
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void *PRI_ptr;
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{
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link_ptr list;
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PixelRegionHolder *PRH;
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PixelRegionIterator *PRI;
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PRI = (PixelRegionIterator *) PRI_ptr;
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PRI->process_count++;
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/* Unref all referenced tiles and increment the offsets */
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list = PRI->pixel_regions;
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while (list)
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{
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PRH = (PixelRegionHolder *) list->data;
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if ((PRH->PR != NULL) && (PRH->PR->process_count != PRI->process_count))
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{
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/* This eliminates the possibility of incrementing the
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* same region twice
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*/
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PRH->PR->process_count++;
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/* Unref the last referenced tile if the underlying region is a tile manager */
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if (PRH->PR->tiles)
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{
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Tile *tile = tile_manager_get_tile (PRH->PR->tiles, PRH->PR->x, PRH->PR->y, 0);
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tile_unref (tile, PRH->PR->dirty);
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}
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PRH->PR->x += PRI->portion_width;
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if ((PRH->PR->x - PRH->startx) >= PRI->region_width)
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{
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PRH->PR->x = PRH->startx;
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PRH->PR->y += PRI->portion_height;
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}
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}
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list = next_item (list);
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}
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return pixel_regions_configure (PRI);
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}
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void
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pixel_regions_process_stop (PRI_ptr)
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void *PRI_ptr;
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{
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link_ptr list;
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PixelRegionHolder *PRH;
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PixelRegionIterator *PRI;
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PRI = (PixelRegionIterator *) PRI_ptr;
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PRI->process_count++;
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/* Unref all referenced tiles and increment the offsets */
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list = PRI->pixel_regions;
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while (list)
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{
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PRH = (PixelRegionHolder *) list->data;
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if ((PRH->PR != NULL) && (PRH->PR->process_count != PRI->process_count))
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{
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/* This eliminates the possibility of incrementing the
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* same region twice
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*/
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PRH->PR->process_count++;
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/* Unref the last referenced tile if the underlying region is a tile manager */
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if (PRH->PR->tiles)
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{
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Tile *tile = tile_manager_get_tile (PRH->PR->tiles, PRH->PR->x, PRH->PR->y, 0);
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tile_unref (tile, PRH->PR->dirty);
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}
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}
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list = next_item (list);
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}
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if (PRI->pixel_regions)
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{
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list = PRI->pixel_regions;
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while (list)
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{
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g_free (list->data);
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list = next_item (list);
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}
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free_list (PRI->pixel_regions);
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g_free (PRI);
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}
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}
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/*********************************/
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/* Static Function Definitions */
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static int
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get_portion_height (PRI)
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PixelRegionIterator *PRI;
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{
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link_ptr list;
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PixelRegionHolder *PRH;
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int min_height = G_MAXINT;
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int height;
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/* Find the minimum height to the next vertical tile (in the case of a tile manager)
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* or to the end of the pixel region (in the case of no tile manager)
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*/
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list = PRI->pixel_regions;
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while (list)
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{
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PRH = (PixelRegionHolder *) list->data;
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if (PRH->PR)
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{
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/* Check if we're past the point of no return */
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if ((PRH->PR->y - PRH->starty) >= PRI->region_height)
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return 0;
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if (PRH->PR->tiles)
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{
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height = TILE_HEIGHT - (PRH->PR->y % TILE_HEIGHT);
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height = BOUNDS (height, 0, (PRI->region_height - (PRH->PR->y - PRH->starty)));
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}
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else
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height = (PRI->region_height - (PRH->PR->y - PRH->starty));
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if (height < min_height)
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min_height = height;
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}
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list = next_item (list);
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}
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return min_height;
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}
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static int
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get_portion_width (PRI)
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PixelRegionIterator *PRI;
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{
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link_ptr list;
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PixelRegionHolder *PRH;
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int min_width = G_MAXINT;
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int width;
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/* Find the minimum width to the next vertical tile (in the case of a tile manager)
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* or to the end of the pixel region (in the case of no tile manager)
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*/
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list = PRI->pixel_regions;
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while (list)
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{
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PRH = (PixelRegionHolder *) list->data;
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if (PRH->PR)
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{
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/* Check if we're past the point of no return */
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if ((PRH->PR->x - PRH->startx) >= PRI->region_width)
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return 0;
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if (PRH->PR->tiles)
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{
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width = TILE_WIDTH - (PRH->PR->x % TILE_WIDTH);
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width = BOUNDS (width, 0, (PRI->region_width - (PRH->PR->x - PRH->startx)));
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}
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else
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width = (PRI->region_width - (PRH->PR->x - PRH->startx));
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if (width < min_width)
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min_width = width;
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}
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list = next_item (list);
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}
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return min_width;
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}
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static void *
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pixel_regions_configure (PRI)
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PixelRegionIterator *PRI;
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{
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PixelRegionHolder *PRH;
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link_ptr list;
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/* Determine the portion width and height */
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PRI->portion_width = get_portion_width (PRI);
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PRI->portion_height = get_portion_height (PRI);
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if (PRI->portion_width == 0 || PRI->portion_height == 0)
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{
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/* free the pixel regions list */
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if (PRI->pixel_regions)
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{
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list = PRI->pixel_regions;
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while (list)
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{
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g_free (list->data);
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list = next_item (list);
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}
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free_list (PRI->pixel_regions);
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g_free (PRI);
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}
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return NULL;
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}
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PRI->process_count++;
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list = PRI->pixel_regions;
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while (list)
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{
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PRH = (PixelRegionHolder *) list->data;
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if ((PRH->PR != NULL) && (PRH->PR->process_count != PRI->process_count))
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{
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PRH->PR->process_count++;
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pixel_region_configure (PRH, PRI);
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}
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list = next_item (list);
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}
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return PRI;
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}
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static void
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pixel_region_configure (PRH, PRI)
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PixelRegionHolder *PRH;
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PixelRegionIterator *PRI;
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{
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/* Configure the rowstride and data pointer for the pixel region
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* based on the current offsets into the region and whether the
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* region is represented by a tile manager or not
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*/
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if (PRH->PR->tiles)
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{
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Tile *tile;
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int offx, offy;
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tile = tile_manager_get_tile (PRH->PR->tiles, PRH->PR->x, PRH->PR->y, 0);
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tile_ref (tile);
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offx = PRH->PR->x % TILE_WIDTH;
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offy = PRH->PR->y % TILE_HEIGHT;
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PRH->PR->rowstride = tile->ewidth * PRH->PR->bytes;
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PRH->PR->data = tile->data + offy * PRH->PR->rowstride + offx * PRH->PR->bytes;
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}
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else
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{
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PRH->PR->data = PRH->original_data +
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(PRH->PR->y - PRH->starty) * PRH->PR->rowstride +
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(PRH->PR->x - PRH->startx) * PRH->PR->bytes;
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}
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PRH->PR->w = PRI->portion_width;
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PRH->PR->h = PRI->portion_height;
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}
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