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gimp/app/channel.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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <math.h>
#include "appenv.h"
#include "channel.h"
#include "drawable.h"
#include "errors.h"
#include "gimage_mask.h"
#include "layer.h"
#include "linked.h"
#include "paint_funcs.h"
#include "temp_buf.h"
#include "undo.h"
#define ROUND(x) ((int) (x + 0.5))
/*
* Static variables
*/
extern int global_drawable_ID;
static link_ptr channel_list = NULL;
/**************************/
/* Function definitions */
static void
channel_validate (TileManager *tm, Tile *tile, int level)
{
/* Set the contents of the tile to empty */
memset (tile->data, TRANSPARENT, tile->ewidth * tile->eheight);
}
void
channel_allocate (Channel *channel, int width, int height)
{
channel->tiles = tile_manager_new (width, height, 1);
}
void
channel_deallocate (Channel *channel)
{
if (channel->tiles)
tile_manager_destroy (channel->tiles);
}
Channel *
channel_new (int gimage_ID, int width, int height, char *name, int opacity,
unsigned char *col)
{
Channel * channel;
int i;
channel = (Channel *) g_malloc (sizeof (Channel));
if (!name)
name = "unnamed";
channel->name = (char *) g_malloc (strlen (name) + 1);
strcpy (channel->name, name);
/* set size information */
channel->width = width;
channel->height = height;
channel->bytes = 1;
/* allocate the memory for this channel */
channel_allocate (channel, width, height);
channel->visible = 1;
/* set the channel color and opacity */
for (i = 0; i < 3; i++)
channel->col[i] = col[i];
channel->opacity = opacity;
channel->show_masked = 1;
channel->dirty = 0;
/* give this channel an ID */
channel->ID = global_drawable_ID++;
channel->layer_ID = -1;
channel->gimage_ID = gimage_ID;
/* add the new channel to the global list */
channel_list = append_to_list (channel_list, (void *) channel);
/* selection mask variables */
channel->empty = TRUE;
channel->segs_in = NULL;
channel->segs_out = NULL;
channel->num_segs_in = 0;
channel->num_segs_out = 0;
channel->bounds_known = TRUE;
channel->boundary_known = TRUE;
channel->x1 = channel->y1 = 0;
channel->x2 = width;
channel->y2 = height;
/* preview variables */
channel->preview = NULL;
channel->preview_valid = FALSE;
return channel;
}
Channel *
channel_copy (Channel *channel)
{
char * channel_name;
Channel * new_channel;
PixelRegion srcPR, destPR;
/* formulate the new channel name */
channel_name = (char *) g_malloc (strlen (channel->name) + 6);
sprintf (channel_name, "%s copy", channel->name);
/* allocate a new channel object */
new_channel = channel_new (channel->gimage_ID, channel->width, channel->height, channel_name,
channel->opacity, channel->col);
new_channel->visible = channel->visible;
new_channel->show_masked = channel->show_masked;
/* copy the contents across channels */
pixel_region_init (&srcPR, channel->tiles, 0, 0, channel->width, channel->height, FALSE);
pixel_region_init (&destPR, new_channel->tiles, 0, 0, channel->width, channel->height, TRUE);
copy_region (&srcPR, &destPR);
/* free up the channel_name memory */
g_free (channel_name);
return new_channel;
}
Channel *
channel_get_ID (int ID)
{
link_ptr tmp = channel_list;
Channel * channel;
while (tmp)
{
channel = (Channel *) tmp->data;
if (channel->ID == ID)
return channel;
tmp = next_item (tmp);
}
return NULL;
}
void
channel_delete (Channel *channel)
{
/* free the segments? */
if (channel->segs_in)
g_free (channel->segs_in);
if (channel->segs_out)
g_free (channel->segs_out);
/* remove this image from the global list */
channel_list = remove_from_list (channel_list, (void *) channel);
/* deallocate the channel mem */
channel_deallocate (channel);
/* free the channel name buffer */
g_free (channel->name);
g_free (channel);
}
void
channel_apply_image (Channel *channel, int x1, int y1, int x2, int y2,
TileManager *tiles, int sparse)
{
/* Need to push an undo operation */
if (! tiles)
undo_push_image (gimage_get_ID (channel->gimage_ID), channel->ID, x1, y1, x2, y2);
else
undo_push_image_mod (gimage_get_ID (channel->gimage_ID), channel->ID, x1, y1, x2, y2, tiles, sparse);
}
void
channel_scale (Channel *channel, int new_width, int new_height)
{
PixelRegion srcPR, destPR;
TileManager *new_tiles;
if (new_width == 0 || new_height == 0)
return;
/* Update the old channel position */
drawable_update (channel->ID, 0, 0, channel->width, channel->height);
/* Configure the pixel regions */
pixel_region_init (&srcPR, channel->tiles, 0, 0, channel->width, channel->height, FALSE);
/* Allocate the new channel, configure dest region */
new_tiles = tile_manager_new (new_width, new_height, 1);
pixel_region_init (&destPR, new_tiles, 0, 0, new_width, new_height, TRUE);
/* Add an alpha channel */
scale_region (&srcPR, &destPR);
/* Push the channel on the undo stack */
undo_push_channel_mod (gimage_get_ID (channel->gimage_ID), channel);
/* Configure the new channel */
channel->tiles = new_tiles;
channel->width = new_width;
channel->height = new_height;
/* bounds are now unknown */
channel->bounds_known = FALSE;
/* Update the new channel position */
drawable_update (channel->ID, 0, 0, channel->width, channel->height);
}
void
channel_resize (Channel *channel, int new_width, int new_height,
int offx, int offy)
{
PixelRegion srcPR, destPR;
TileManager *new_tiles;
unsigned char bg = 0;
int clear;
int w, h;
int x1, y1, x2, y2;
if (!new_width || !new_height)
return;
x1 = BOUNDS (offx, 0, new_width);
y1 = BOUNDS (offy, 0, new_height);
x2 = BOUNDS ((offx + channel->width), 0, new_width);
y2 = BOUNDS ((offy + channel->height), 0, new_height);
w = x2 - x1;
h = y2 - y1;
if (offx > 0)
{
x1 = 0;
x2 = offx;
}
else
{
x1 = -offx;
x2 = 0;
}
if (offy > 0)
{
y1 = 0;
y2 = offy;
}
else
{
y1 = -offy;
y2 = 0;
}
/* Update the old channel position */
drawable_update (channel->ID, 0, 0, channel->width, channel->height);
/* Configure the pixel regions */
pixel_region_init (&srcPR, channel->tiles, x1, y1, w, h, FALSE);
/* Determine whether the new channel needs to be initially cleared */
if ((new_width > channel->width) ||
(new_height > channel->height) ||
(x2 || y2))
clear = TRUE;
else
clear = FALSE;
/* Allocate the new channel, configure dest region */
new_tiles = tile_manager_new (new_width, new_height, 1);
/* Set to black (empty--for selections) */
if (clear)
{
pixel_region_init (&destPR, new_tiles, 0, 0, new_width, new_height, TRUE);
color_region (&destPR, &bg);
}
/* copy from the old to the new */
pixel_region_init (&destPR, new_tiles, x2, y2, w, h, TRUE);
if (w && h)
copy_region (&srcPR, &destPR);
/* Push the channel on the undo stack */
undo_push_channel_mod (gimage_get_ID (channel->gimage_ID), channel);
/* Configure the new channel */
channel->tiles = new_tiles;
channel->width = new_width;
channel->height = new_height;
/* bounds are now unknown */
channel->bounds_known = FALSE;
/* update the new channel area */
drawable_update (channel->ID, 0, 0, channel->width, channel->height);
}
/********************/
/* access functions */
unsigned char *
channel_data (Channel *channel)
{
return NULL;
}
int
channel_toggle_visibility (Channel *channel)
{
channel->visible = !channel->visible;
return channel->visible;
}
TempBuf *
channel_preview (Channel *channel, int width, int height)
{
MaskBuf * preview_buf;
PixelRegion srcPR, destPR;
int subsample;
/* The easy way */
if (channel->preview_valid &&
channel->preview->width == width &&
channel->preview->height == height)
return channel->preview;
/* The hard way */
else
{
/* calculate 'acceptable' subsample */
subsample = 1;
if (width < 1) width = 1;
if (height < 1) height = 1;
while ((width * (subsample + 1) * 2 < channel->width) &&
(height * (subsample + 1) * 2 < channel->height))
subsample = subsample + 1;
pixel_region_init (&srcPR, channel->tiles, 0, 0, channel->width, channel->height, FALSE);
preview_buf = mask_buf_new (width, height);
destPR.bytes = 1;
destPR.x = 0;
destPR.y = 0;
destPR.w = width;
destPR.h = height;
destPR.rowstride = width;
destPR.data = mask_buf_data (preview_buf);
subsample_region (&srcPR, &destPR, subsample);
if (channel->preview_valid)
mask_buf_free (channel->preview);
channel->preview = preview_buf;
channel->preview_valid = 1;
return channel->preview;
}
}
void
channel_invalidate_previews (int gimage_id)
{
link_ptr tmp = channel_list;
Channel * channel;
while (tmp)
{
channel = (Channel *) tmp->data;
if (gimage_id == -1 || (channel->gimage_ID == gimage_id))
drawable_invalidate_preview (channel->ID);
tmp = next_item (tmp);
}
}
/****************************/
/* selection mask functions */
Channel *
channel_new_mask (int gimage_ID, int width, int height)
{
unsigned char black[3] = {0, 0, 0};
Channel *new_channel;
/* Create the new channel */
new_channel = channel_new (gimage_ID, width, height, "Selection Mask", 127, black);
/* Set the validate procedure */
tile_manager_set_validate_proc (new_channel->tiles, channel_validate);
return new_channel;
}
int
channel_boundary (Channel *mask, BoundSeg **segs_in, BoundSeg **segs_out,
int *num_segs_in, int *num_segs_out,
int x1, int y1, int x2, int y2)
{
int x3, y3, x4, y4;
PixelRegion bPR;
if (! mask->boundary_known)
{
/* free the out of date boundary segments */
if (mask->segs_in)
g_free (mask->segs_in);
if (mask->segs_out)
g_free (mask->segs_out);
if (channel_bounds (mask, &x3, &y3, &x4, &y4))
{
pixel_region_init (&bPR, mask->tiles, x3, y3, (x4 - x3), (y4 - y3), FALSE);
mask->segs_out = find_mask_boundary (&bPR, &mask->num_segs_out,
IgnoreBounds,
x1, y1,
x2, y2);
x1 = MAXIMUM (x1, x3);
y1 = MAXIMUM (y1, y3);
x2 = MINIMUM (x2, x4);
y2 = MINIMUM (y2, y4);
if (x2 > x1 && y2 > y1)
{
pixel_region_init (&bPR, mask->tiles, 0, 0, mask->width, mask->height, FALSE);
mask->segs_in = find_mask_boundary (&bPR, &mask->num_segs_in,
WithinBounds,
x1, y1,
x2, y2);
}
else
{
mask->segs_in = NULL;
mask->num_segs_in = 0;
}
}
else
{
mask->segs_in = NULL;
mask->segs_out = NULL;
mask->num_segs_in = 0;
mask->num_segs_out = 0;
}
mask->boundary_known = TRUE;
}
*segs_in = mask->segs_in;
*segs_out = mask->segs_out;
*num_segs_in = mask->num_segs_in;
*num_segs_out = mask->num_segs_out;
return TRUE;
}
int
channel_value (Channel *mask, int x, int y)
{
Tile *tile;
int val;
/* Some checks to cut back on unnecessary work */
if (mask->bounds_known)
{
if (mask->empty)
return 0;
else if (x < mask->x1 || x >= mask->x2 || y < mask->y1 || y >= mask->y2)
return 0;
}
else
{
if (x < 0 || x >= mask->width || y < 0 || y >= mask->height)
return 0;
}
tile = tile_manager_get_tile (mask->tiles, x, y, 0);
tile_ref (tile);
val = tile->data[(y % TILE_HEIGHT) * TILE_WIDTH + (x % TILE_WIDTH)];
tile_unref (tile, FALSE);
return val;
}
int
channel_bounds (Channel *mask, int *x1, int *y1, int *x2, int *y2)
{
PixelRegion maskPR;
unsigned char * data;
int x, y;
int ex, ey;
int found;
void *pr;
/* if the mask's bounds have already been reliably calculated... */
if (mask->bounds_known)
{
*x1 = mask->x1;
*y1 = mask->y1;
*x2 = mask->x2;
*y2 = mask->y2;
return (mask->empty) ? FALSE : TRUE;
}
/* go through and calculate the bounds */
*x1 = mask->width;
*y1 = mask->height;
*x2 = 0;
*y2 = 0;
pixel_region_init (&maskPR, mask->tiles, 0, 0, mask->width, mask->height, FALSE);
for (pr = pixel_regions_register (1, &maskPR); pr != NULL; pr = pixel_regions_process (pr))
{
data = maskPR.data;
ex = maskPR.x + maskPR.w;
ey = maskPR.y + maskPR.h;
for (y = maskPR.y; y < ey; y++)
{
found = FALSE;
for (x = maskPR.x; x < ex; x++, data++)
if (*data)
{
if (x < *x1)
*x1 = x;
if (x > *x2)
*x2 = x;
found = TRUE;
}
if (found)
{
if (y < *y1)
*y1 = y;
if (y > *y2)
*y2 = y;
}
}
}
*x2 = BOUNDS (*x2 + 1, 0, mask->width);
*y2 = BOUNDS (*y2 + 1, 0, mask->height);
if (*x1 == mask->width && *y1 == mask->height)
{
mask->empty = TRUE;
mask->x1 = 0; mask->y1 = 0;
mask->x2 = mask->width;
mask->y2 = mask->height;
}
else
{
mask->empty = FALSE;
mask->x1 = *x1;
mask->y1 = *y1;
mask->x2 = *x2;
mask->y2 = *y2;
}
mask->bounds_known = TRUE;
return (mask->empty) ? FALSE : TRUE;
}
int
channel_is_empty (Channel *mask)
{
PixelRegion maskPR;
unsigned char * data;
int x, y;
void * pr;
if (mask->bounds_known)
return mask->empty;
pixel_region_init (&maskPR, mask->tiles, 0, 0, mask->width, mask->height, FALSE);
for (pr = pixel_regions_register (1, &maskPR); pr != NULL; pr = pixel_regions_process (pr))
{
/* check if any pixel in the mask is non-zero */
data = maskPR.data;
for (y = 0; y < maskPR.h; y++)
for (x = 0; x < maskPR.w; x++)
if (*data++)
{
pixel_regions_process_stop (pr);
return FALSE;
}
}
/* The mask is empty, meaning we can set the bounds as known */
if (mask->segs_in)
g_free (mask->segs_in);
if (mask->segs_out)
g_free (mask->segs_out);
mask->empty = TRUE;
mask->segs_in = NULL;
mask->segs_out = NULL;
mask->num_segs_in = 0;
mask->num_segs_out = 0;
mask->bounds_known = TRUE;
mask->boundary_known = TRUE;
mask->x1 = 0; mask->y1 = 0;
mask->x2 = mask->width;
mask->y2 = mask->height;
return TRUE;
}
void
channel_add_segment (Channel *mask, int x, int y, int width, int value)
{
PixelRegion maskPR;
unsigned char *data;
int val;
int x2;
void * pr;
/* check horizontal extents... */
x2 = x + width;
if (x2 < 0) x2 = 0;
if (x2 > mask->width) x2 = mask->width;
if (x < 0) x = 0;
if (x > mask->width) x = mask->width;
width = x2 - x;
if (!width) return;
if (y < 0 || y > mask->height)
return;
pixel_region_init (&maskPR, mask->tiles, x, y, width, 1, TRUE);
for (pr = pixel_regions_register (1, &maskPR); pr != NULL; pr = pixel_regions_process (pr))
{
data = maskPR.data;
width = maskPR.w;
while (width--)
{
val = *data + value;
if (val > 255)
val = 255;
*data++ = val;
}
}
}
void
channel_sub_segment (Channel *mask, int x, int y, int width, int value)
{
PixelRegion maskPR;
unsigned char *data;
int val;
int x2;
void * pr;
/* check horizontal extents... */
x2 = x + width;
if (x2 < 0) x2 = 0;
if (x2 > mask->width) x2 = mask->width;
if (x < 0) x = 0;
if (x > mask->width) x = mask->width;
width = x2 - x;
if (!width) return;
if (y < 0 || y > mask->height)
return;
pixel_region_init (&maskPR, mask->tiles, x, y, width, 1, TRUE);
for (pr = pixel_regions_register (1, &maskPR); pr != NULL; pr = pixel_regions_process (pr))
{
data = maskPR.data;
width = maskPR.w;
while (width--)
{
val = *data - value;
if (val < 0)
val = 0;
*data++ = val;
}
}
}
void
channel_inter_segment (Channel *mask, int x, int y, int width, int value)
{
PixelRegion maskPR;
unsigned char *data;
int val;
int x2;
void * pr;
/* check horizontal extents... */
x2 = x + width;
if (x2 < 0) x2 = 0;
if (x2 > mask->width) x2 = mask->width;
if (x < 0) x = 0;
if (x > mask->width) x = mask->width;
width = x2 - x;
if (!width) return;
if (y < 0 || y > mask->height)
return;
pixel_region_init (&maskPR, mask->tiles, x, y, width, 1, TRUE);
for (pr = pixel_regions_register (1, &maskPR); pr != NULL; pr = pixel_regions_process (pr))
{
data = maskPR.data;
width = maskPR.w;
while (width--)
{
val = MINIMUM(*data, value);
*data++ = val;
}
}
}
void
channel_combine_rect (Channel *mask, int op, int x, int y, int w, int h)
{
int i;
for (i = y; i < y + h; i++)
{
if (i >= 0 && i < mask->height)
switch (op)
{
case ADD: case REPLACE:
channel_add_segment (mask, x, i, w, 255);
break;
case SUB:
channel_sub_segment (mask, x, i, w, 255);
break;
case INTERSECT:
channel_inter_segment (mask, x, i, w, 255);
break;
}
}
/* Determine new boundary */
if (mask->bounds_known && (op == ADD) && !mask->empty)
{
if (x < mask->x1)
mask->x1 = x;
if (y < mask->y1)
mask->y1 = y;
if ((x + w) > mask->x2)
mask->x2 = (x + w);
if ((y + h) > mask->y2)
mask->y2 = (y + h);
}
else if (op == REPLACE || mask->empty)
{
mask->empty = FALSE;
mask->x1 = x;
mask->y1 = y;
mask->x2 = x + w;
mask->y2 = y + h;
}
else
mask->bounds_known = FALSE;
mask->x1 = BOUNDS (mask->x1, 0, mask->width);
mask->y1 = BOUNDS (mask->y1, 0, mask->height);
mask->x2 = BOUNDS (mask->x2, 0, mask->width);
mask->y2 = BOUNDS (mask->y2, 0, mask->height);
}
void
channel_combine_ellipse (Channel *mask, int op, int x, int y, int w, int h,
int aa /* antialias selection? */)
{
int i, j;
int x0, x1, x2;
int val, last;
float a_sqr, b_sqr, aob_sqr;
float w_sqr, h_sqr;
float y_sqr;
float t0, t1;
float r;
float cx, cy;
float rad;
float dist;
if (!w || !h)
return;
a_sqr = (w * w / 4.0);
b_sqr = (h * h / 4.0);
aob_sqr = a_sqr / b_sqr;
cx = x + w / 2.0;
cy = y + h / 2.0;
for (i = y; i < (y + h); i++)
{
if (i >= 0 && i < mask->height)
{
/* Non-antialiased code */
if (!aa)
{
y_sqr = (i + 0.5 - cy) * (i + 0.5 - cy);
rad = sqrt (a_sqr - a_sqr * y_sqr / (double) b_sqr);
x1 = ROUND (cx - rad);
x2 = ROUND (cx + rad);
switch (op)
{
case ADD: case REPLACE:
channel_add_segment (mask, x1, i, (x2 - x1), 255);
break;
case SUB :
channel_sub_segment (mask, x1, i, (x2 - x1), 255);
break;
case INTERSECT:
channel_inter_segment (mask, x1, i, (x2 - x1), 255);
break;
}
}
/* antialiasing */
else
{
x0 = x;
last = 0;
h_sqr = (i + 0.5 - cy) * (i + 0.5 - cy);
for (j = x; j < (x + w); j++)
{
w_sqr = (j + 0.5 - cx) * (j + 0.5 - cx);
if (h_sqr != 0)
{
t0 = w_sqr / h_sqr;
t1 = a_sqr / (t0 + aob_sqr);
r = sqrt (t1 + t0 * t1);
rad = sqrt (w_sqr + h_sqr);
dist = rad - r;
}
else
dist = -1.0;
if (dist < -0.5)
val = 255;
else if (dist < 0.5)
val = (int) (255 * (1 - (dist + 0.5)));
else
val = 0;
if (last != val && last)
{
switch (op)
{
case ADD: case REPLACE:
channel_add_segment (mask, x0, i, j - x0, last);
break;
case SUB:
channel_sub_segment (mask, x0, i, j - x0, last);
break;
case INTERSECT:
channel_inter_segment (mask, x0, i, j - x0, last);
}
}
if (last != val)
{
x0 = j;
last = val;
}
}
if (last)
{
if (op == ADD || op == REPLACE)
channel_add_segment (mask, x0, i, j - x0, last);
else if (op == SUB)
channel_sub_segment (mask, x0, i, j - x0, last);
else if (op == INTERSECT)
channel_inter_segment (mask, x0, i, j - x0, last);
}
}
}
}
/* Determine new boundary */
if (mask->bounds_known && (op == ADD) && !mask->empty)
{
if (x < mask->x1)
mask->x1 = x;
if (y < mask->y1)
mask->y1 = y;
if ((x + w) > mask->x2)
mask->x2 = (x + w);
if ((y + h) > mask->y2)
mask->y2 = (y + h);
}
else if (op == REPLACE || mask->empty)
{
mask->empty = FALSE;
mask->x1 = x;
mask->y1 = y;
mask->x2 = x + w;
mask->y2 = y + h;
}
else
mask->bounds_known = FALSE;
mask->x1 = BOUNDS (mask->x1, 0, mask->width);
mask->y1 = BOUNDS (mask->y1, 0, mask->height);
mask->x2 = BOUNDS (mask->x2, 0, mask->width);
mask->y2 = BOUNDS (mask->y2, 0, mask->height);
}
void
channel_combine_mask (Channel *mask, Channel *add_on, int op,
int off_x, int off_y)
{
PixelRegion srcPR, destPR;
unsigned char *src;
unsigned char *dest;
int val;
int x1, y1, x2, y2;
int x, y;
int w, h;
void * pr;
x1 = BOUNDS (off_x, 0, mask->width);
y1 = BOUNDS (off_y, 0, mask->height);
x2 = BOUNDS (off_x + add_on->width, 0, mask->width);
y2 = BOUNDS (off_y + add_on->height, 0, mask->height);
w = (x2 - x1);
h = (y2 - y1);
pixel_region_init (&srcPR, add_on->tiles, (x1 - off_x), (y1 - off_y), w, h, FALSE);
pixel_region_init (&destPR, mask->tiles, x1, y1, w, h, TRUE);
for (pr = pixel_regions_register (2, &srcPR, &destPR); pr != NULL; pr = pixel_regions_process (pr))
{
src = srcPR.data;
dest = destPR.data;
for (y = 0; y < srcPR.h; y++)
{
for (x = 0; x < srcPR.w; x++)
{
switch (op)
{
case ADD: case REPLACE:
val = dest[x] + src[x];
if (val > 255) val = 255;
break;
case SUB:
val = dest[x] - src[x];
if (val < 0) val = 0;
break;
case INTERSECT:
val = MINIMUM(dest[x], src[x]);
break;
default:
val = 0;
break;
}
dest[x] = val;
}
src += srcPR.rowstride;
dest += destPR.rowstride;
}
}
mask->bounds_known = FALSE;
}
void
channel_feather (Channel *input, Channel *output, double radius,
int op, int off_x, int off_y)
{
int x1, y1, x2, y2;
PixelRegion srcPR;
x1 = BOUNDS (off_x, 0, output->width);
y1 = BOUNDS (off_y, 0, output->height);
x2 = BOUNDS (off_x + input->width, 0, output->width);
y2 = BOUNDS (off_y + input->height, 0, output->height);
pixel_region_init (&srcPR, input->tiles, (x1 - off_x), (y1 - off_y), (x2 - x1), (y2 - y1), FALSE);
gaussian_blur_region (&srcPR, radius);
if (input != output)
channel_combine_mask(output, input, op, 0, 0);
output->bounds_known = FALSE;
}
void
channel_push_undo (Channel *mask)
{
int x1, y1, x2, y2;
MaskUndo *mask_undo;
TileManager *undo_tiles;
PixelRegion srcPR, destPR;
GImage *gimage;
mask_undo = (MaskUndo *) g_malloc (sizeof (MaskUndo));
if (channel_bounds (mask, &x1, &y1, &x2, &y2))
{
undo_tiles = tile_manager_new ((x2 - x1), (y2 - y1), 1);
pixel_region_init (&srcPR, mask->tiles, x1, y1, (x2 - x1), (y2 - y1), FALSE);
pixel_region_init (&destPR, undo_tiles, 0, 0, (x2 - x1), (y2 - y1), TRUE);
copy_region (&srcPR, &destPR);
}
else
undo_tiles = NULL;
mask_undo->tiles = undo_tiles;
mask_undo->x = x1;
mask_undo->y = y1;
/* push the undo buffer onto the undo stack */
gimage = gimage_get_ID (mask->gimage_ID);
undo_push_mask (gimage, mask_undo);
gimage_mask_invalidate (gimage);
/* invalidate the preview */
mask->preview_valid = 0;
}
void
channel_clear (Channel *mask)
{
PixelRegion maskPR;
unsigned char bg = 0;
/* push the current channel onto the undo stack */
channel_push_undo (mask);
if (mask->bounds_known && !mask->empty)
{
pixel_region_init (&maskPR, mask->tiles, mask->x1, mask->y1,
(mask->x2 - mask->x1), (mask->y2 - mask->y1), TRUE);
color_region (&maskPR, &bg);
}
else
{
/* clear the mask */
pixel_region_init (&maskPR, mask->tiles, 0, 0, mask->width, mask->height, TRUE);
color_region (&maskPR, &bg);
}
/* we know the bounds */
mask->bounds_known = TRUE;
mask->empty = TRUE;
mask->x1 = 0; mask->y1 = 0;
mask->x2 = mask->width;
mask->y2 = mask->height;
}
void
channel_invert (Channel *mask)
{
PixelRegion maskPR;
unsigned char *data;
int size;
void * pr;
/* push the current channel onto the undo stack */
channel_push_undo (mask);
pixel_region_init (&maskPR, mask->tiles, 0, 0, mask->width, mask->height, TRUE);
for (pr = pixel_regions_register (1, &maskPR); pr != NULL; pr = pixel_regions_process (pr))
{
/* subtract each pixel in the mask from 255 */
data = maskPR.data;
size = maskPR.w * maskPR.h;
while (size --)
{
*data = 255 - *data;
data++;
}
}
mask->bounds_known = FALSE;
}
void
channel_sharpen (Channel *mask)
{
PixelRegion maskPR;
unsigned char *data;
int size;
void * pr;
/* push the current channel onto the undo stack */
channel_push_undo (mask);
pixel_region_init (&maskPR, mask->tiles, 0, 0, mask->width, mask->height, TRUE);
for (pr = pixel_regions_register (1, &maskPR); pr != NULL; pr = pixel_regions_process (pr))
{
/* if a pixel in the mask has a non-zero value, make it 255 */
data = maskPR.data;
size = maskPR.w * maskPR.h;
while (size--)
{
if (*data > HALF_WAY)
*data++ = 255;
else
*data++ = 0;
}
}
mask->bounds_known = FALSE;
}
void
channel_all (Channel *mask)
{
PixelRegion maskPR;
unsigned char bg = 255;
/* push the current channel onto the undo stack */
channel_push_undo (mask);
/* clear the mask */
pixel_region_init (&maskPR, mask->tiles, 0, 0, mask->width, mask->height, TRUE);
color_region (&maskPR, &bg);
/* we know the bounds */
mask->bounds_known = TRUE;
mask->empty = FALSE;
mask->x1 = 0; mask->y1 = 0;
mask->x2 = mask->width;
mask->y2 = mask->height;
}
void
channel_border (Channel *mask, int radius)
{
PixelRegion bPR;
int x1, y1, x2, y2;
BoundSeg * bs;
unsigned char bg = 0;
int num_segs;
if (! channel_bounds (mask, &x1, &y1, &x2, &y2))
return;
/* push the current channel onto the undo stack */
channel_push_undo (mask);
pixel_region_init (&bPR, mask->tiles, x1, y1, (x2 - x1), (y2 - y1), FALSE);
bs = find_mask_boundary (&bPR, &num_segs, WithinBounds, x1, y1, x2, y2);
/* clear the channel */
if (mask->bounds_known && !mask->empty)
{
pixel_region_init (&bPR, mask->tiles, mask->x1, mask->y1,
(mask->x2 - mask->x1), (mask->y2 - mask->y1), TRUE);
color_region (&bPR, &bg);
}
else
{
/* clear the mask */
pixel_region_init (&bPR, mask->tiles, 0, 0, mask->width, mask->height, TRUE);
color_region (&bPR, &bg);
}
/* calculate a border of specified radius based on the boundary segments */
pixel_region_init (&bPR, mask->tiles, 0, 0, mask->width, mask->height, TRUE);
border_region (&bPR, bs, num_segs, radius);
g_free (bs);
mask->bounds_known = FALSE;
}
void
channel_grow (Channel *mask, int steps)
{
PixelRegion bPR;
if (channel_is_empty (mask))
return;
/* push the current channel onto the undo stack */
channel_push_undo (mask);
/* need full extents for grow */
pixel_region_init (&bPR, mask->tiles, 0, 0, mask->width, mask->height, TRUE);
while (steps--)
thin_region (&bPR, GROW_REGION);
mask->bounds_known = FALSE;
}
void
channel_shrink (Channel *mask, int steps)
{
PixelRegion bPR;
int x1, y1, x2, y2;
if (! channel_bounds (mask, &x1, &y1, &x2, &y2))
return;
/* push the current channel onto the undo stack */
channel_push_undo (mask);
pixel_region_init (&bPR, mask->tiles, x1, y1, (x2 - x1), (y2 - y1), TRUE);
while (steps--)
thin_region (&bPR, SHRINK_REGION);
mask->bounds_known = FALSE;
}
void
channel_translate (Channel *mask, int off_x, int off_y)
{
int width, height;
Channel *tmp_mask;
PixelRegion srcPR, destPR;
unsigned char empty = 0;
int x1, y1, x2, y2;
tmp_mask = NULL;
/* push the current channel onto the undo stack */
channel_push_undo (mask);
channel_bounds (mask, &x1, &y1, &x2, &y2);
x1 = BOUNDS ((x1 + off_x), 0, mask->width);
y1 = BOUNDS ((y1 + off_y), 0, mask->height);
x2 = BOUNDS ((x2 + off_x), 0, mask->width);
y2 = BOUNDS ((y2 + off_y), 0, mask->height);
width = x2 - x1;
height = y2 - y1;
/* make sure width and height are non-zero */
if (width != 0 && height != 0)
{
/* copy the portion of the mask we will keep to a
* temporary buffer
*/
tmp_mask = channel_new_mask (mask->gimage_ID, width, height);
pixel_region_init (&srcPR, mask->tiles, x1 - off_x, y1 - off_y, width, height, FALSE);
pixel_region_init (&destPR, tmp_mask->tiles, 0, 0, width, height, TRUE);
copy_region (&srcPR, &destPR);
}
/* clear the mask */
pixel_region_init (&srcPR, mask->tiles, 0, 0, mask->width, mask->height, TRUE);
color_region (&srcPR, &empty);
if (width != 0 && height != 0)
{
/* copy the temp mask back to the mask */
pixel_region_init (&srcPR, tmp_mask->tiles, 0, 0, width, height, FALSE);
pixel_region_init (&destPR, mask->tiles, x1, y1, width, height, TRUE);
copy_region (&srcPR, &destPR);
/* free the temporary mask */
channel_delete (tmp_mask);
}
/* calculate new bounds */
if (width == 0 || height == 0)
{
mask->empty = TRUE;
mask->x1 = 0; mask->y1 = 0;
mask->x2 = mask->width;
mask->y2 = mask->height;
}
else
{
mask->x1 = x1;
mask->y1 = y1;
mask->x2 = x2;
mask->y2 = y2;
}
}
void
channel_layer_alpha (Channel *mask, int layer_id)
{
PixelRegion srcPR, destPR;
Layer *layer;
unsigned char empty = 0;
int x1, y1, x2, y2;
/* push the current mask onto the undo stack */
channel_push_undo (mask);
/* clear the mask */
pixel_region_init (&destPR, mask->tiles, 0, 0, mask->width, mask->height, TRUE);
color_region (&destPR, &empty);
layer = layer_get_ID (layer_id);
x1 = BOUNDS (layer->offset_x, 0, mask->width);
y1 = BOUNDS (layer->offset_y, 0, mask->height);
x2 = BOUNDS (layer->offset_x + layer->width, 0, mask->width);
y2 = BOUNDS (layer->offset_y + layer->height, 0, mask->height);
pixel_region_init (&srcPR, layer->tiles,
(x1 - layer->offset_x), (y1 - layer->offset_y),
(x2 - x1), (y2 - y1), FALSE);
pixel_region_init (&destPR, mask->tiles, x1, y1, (x2 - x1), (y2 - y1), TRUE);
extract_alpha_region (&srcPR, NULL, &destPR);
mask->bounds_known = FALSE;
}
void
channel_layer_mask (Channel *mask, int layer_id)
{
PixelRegion srcPR, destPR;
Layer *layer;
unsigned char empty = 0;
int x1, y1, x2, y2;
/* push the current mask onto the undo stack */
channel_push_undo (mask);
/* clear the mask */
pixel_region_init (&destPR, mask->tiles, 0, 0, mask->width, mask->height, TRUE);
color_region (&destPR, &empty);
layer = layer_get_ID (layer_id);
x1 = BOUNDS (layer->offset_x, 0, mask->width);
y1 = BOUNDS (layer->offset_y, 0, mask->height);
x2 = BOUNDS (layer->offset_x + layer->width, 0, mask->width);
y2 = BOUNDS (layer->offset_y + layer->height, 0, mask->height);
pixel_region_init (&srcPR, layer->mask->tiles,
(x1 - layer->offset_x), (y1 - layer->offset_y),
(x2 - x1), (y2 - y1), FALSE);
pixel_region_init (&destPR, mask->tiles, x1, y1, (x2 - x1), (y2 - y1), TRUE);
copy_region (&srcPR, &destPR);
mask->bounds_known = FALSE;
}
void
channel_load (Channel *mask, Channel *channel)
{
PixelRegion srcPR, destPR;
/* push the current mask onto the undo stack */
channel_push_undo (mask);
/* copy the channel to the mask */
pixel_region_init (&srcPR, channel->tiles, 0, 0, channel->width, channel->height, FALSE);
pixel_region_init (&destPR, mask->tiles, 0, 0, channel->width, channel->height, TRUE);
copy_region (&srcPR, &destPR);
mask->bounds_known = FALSE;
}
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