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gimp/app/paint_core.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 <stdlib.h>
#include <string.h>
#include <math.h>
#include "appenv.h"
#include "brushes.h"
#include "channels_dialog.h"
#include "drawable.h"
#include "errors.h"
#include "gdisplay.h"
#include "gimage_mask.h"
#include "layers_dialog.h"
#include "paint_funcs.h"
#include "paint_core.h"
#include "selection.h"
#include "tools.h"
#include "undo.h"
#define SQR(x) ((x) * (x))
#define EPSILON 0.00001
/* global variables--for use in the various paint tools */
PaintCore non_gui_paint_core;
/* local function prototypes */
static MaskBuf * paint_core_subsample_mask (MaskBuf *, double, double);
static MaskBuf * paint_core_solidify_mask (MaskBuf *);
static MaskBuf * paint_core_get_brush_mask (PaintCore *, int);
static void paint_core_paste (PaintCore *, MaskBuf *, int, int, int, int, int);
static void paint_core_replace (PaintCore *, MaskBuf *, int, int, int, int);
static void paint_to_canvas_tiles (PaintCore *, MaskBuf *, int);
static void paint_to_canvas_buf (PaintCore *, MaskBuf *, int);
static void set_undo_tiles (int, int, int, int, int);
static void set_canvas_tiles (int, int, int, int);
/***********************************************************************/
/* undo blocks variables */
static TileManager * undo_tiles = NULL;
static TileManager * canvas_tiles = NULL;
/***********************************************************************/
/* paint buffers variables */
static TempBuf * orig_buf = NULL;
static TempBuf * canvas_buf = NULL;
/* brush buffers */
static MaskBuf * solid_brush;
static MaskBuf * kernel_brushes[4][4] = { {NULL, NULL, NULL, NULL},
{NULL, NULL, NULL, NULL},
{NULL, NULL, NULL, NULL},
{NULL, NULL, NULL, NULL}};
/* paint buffers utility functions */
static void free_paint_buffers (void);
/***********************************************************************/
#define KERNEL_WIDTH 3
#define KERNEL_HEIGHT 3
/* Brush pixel subsampling kernels */
static int subsample[4][4][9] =
{
{
{ 16, 48, 0, 48, 144, 0, 0, 0, 0 },
{ 0, 64, 0, 0, 192, 0, 0, 0, 0 },
{ 0, 48, 16, 0, 144, 48, 0, 0, 0 },
{ 0, 32, 32, 0, 96, 96, 0, 0, 0 },
},
{
{ 0, 0, 0, 64, 192, 0, 0, 0, 0 },
{ 0, 0, 0, 0, 256, 0, 0, 0, 0 },
{ 0, 0, 0, 0, 192, 64, 0, 0, 0 },
{ 0, 0, 0, 0, 128, 128, 0, 0, 0 },
},
{
{ 0, 0, 0, 48, 144, 0, 16, 48, 0 },
{ 0, 0, 0, 0, 192, 0, 0, 64, 0 },
{ 0, 0, 0, 0, 144, 48, 0, 48, 16 },
{ 0, 0, 0, 0, 96, 96, 0, 32, 32 },
},
{
{ 0, 0, 0, 32, 96, 0, 32, 96, 0 },
{ 0, 0, 0, 0, 128, 0, 0, 128, 0 },
{ 0, 0, 0, 0, 96, 32, 0, 96, 32 },
{ 0, 0, 0, 0, 64, 64, 0, 64, 64 },
},
};
void
paint_core_button_press (tool, bevent, gdisp_ptr)
Tool *tool;
GdkEventButton *bevent;
gpointer gdisp_ptr;
{
PaintCore * paint_core;
GDisplay * gdisp;
int drawable_id;
int draw_line = 0;
double x, y;
gdisp = (GDisplay *) gdisp_ptr;
paint_core = (PaintCore *) tool->private;
gdisplay_untransform_coords_f (gdisp, (double) bevent->x, (double) bevent->y, &x, &y, TRUE);
drawable_id = gimage_active_drawable (gdisp->gimage);
if (! paint_core_init (paint_core, drawable_id, x, y))
return;
paint_core->state = bevent->state;
/* if this is a new image, reinit the core vals */
if (gdisp_ptr != tool->gdisp_ptr ||
! (bevent->state & GDK_SHIFT_MASK))
{
/* initialize some values */
paint_core->startx = paint_core->lastx = paint_core->curx;
paint_core->starty = paint_core->lasty = paint_core->cury;
}
/* If shift is down and this is not the first paint
* stroke, then draw a line from the last coords to the pointer
*/
else if (bevent->state & GDK_SHIFT_MASK)
{
draw_line = 1;
paint_core->startx = paint_core->lastx;
paint_core->starty = paint_core->lasty;
}
tool->state = ACTIVE;
tool->gdisp_ptr = gdisp_ptr;
tool->paused_count = 0;
/* pause the current selection and grab the pointer */
gdisplays_selection_visibility (gdisp->gimage->ID, SelectionPause);
/* add motion memory if you press mod1 first */
if (bevent->state & GDK_MOD1_MASK)
gdk_pointer_grab (gdisp->canvas->window, FALSE,
GDK_BUTTON1_MOTION_MASK | GDK_BUTTON_RELEASE_MASK,
NULL, NULL, bevent->time);
else
gdk_pointer_grab (gdisp->canvas->window, FALSE,
GDK_POINTER_MOTION_HINT_MASK | GDK_BUTTON1_MOTION_MASK | GDK_BUTTON_RELEASE_MASK,
NULL, NULL, bevent->time);
/* Let the specific painting function initialize itself */
(* paint_core->paint_func) (paint_core, drawable_id, INIT_PAINT);
/* Paint to the image */
if (draw_line)
{
paint_core_interpolate (paint_core, drawable_id);
paint_core->lastx = paint_core->curx;
paint_core->lasty = paint_core->cury;
}
else
(* paint_core->paint_func) (paint_core, drawable_id, MOTION_PAINT);
gdisplay_flush (gdisp);
}
void
paint_core_button_release (tool, bevent, gdisp_ptr)
Tool *tool;
GdkEventButton *bevent;
gpointer gdisp_ptr;
{
GDisplay * gdisp;
GImage * gimage;
PaintCore * paint_core;
gdisp = (GDisplay *) gdisp_ptr;
gimage = gdisp->gimage;
paint_core = (PaintCore *) tool->private;
/* resume the current selection and ungrab the pointer */
gdisplays_selection_visibility (gdisp->gimage->ID, SelectionResume);
gdk_pointer_ungrab (bevent->time);
gdk_flush ();
/* Let the specific painting function finish up */
(* paint_core->paint_func) (paint_core, gimage_active_drawable (gdisp->gimage), FINISH_PAINT);
/* Set tool state to inactive -- no longer painting */
tool->state = INACTIVE;
paint_core_finish (paint_core, gimage_active_drawable (gdisp->gimage), tool->ID);
gdisplays_flush ();
}
void
paint_core_motion (tool, mevent, gdisp_ptr)
Tool *tool;
GdkEventMotion *mevent;
gpointer gdisp_ptr;
{
GDisplay * gdisp;
PaintCore * paint_core;
gdisp = (GDisplay *) gdisp_ptr;
paint_core = (PaintCore *) tool->private;
gdisplay_untransform_coords_f (gdisp, (double) mevent->x, (double) mevent->y,
&paint_core->curx, &paint_core->cury, TRUE);
paint_core->state = mevent->state;
paint_core_interpolate (paint_core, gimage_active_drawable (gdisp->gimage));
gdisplay_flush (gdisp);
paint_core->lastx = paint_core->curx;
paint_core->lasty = paint_core->cury;
}
void
paint_core_cursor_update (tool, mevent, gdisp_ptr)
Tool *tool;
GdkEventMotion *mevent;
gpointer gdisp_ptr;
{
GDisplay *gdisp;
Layer *layer;
GdkCursorType ctype = GDK_TOP_LEFT_ARROW;
int x, y;
gdisp = (GDisplay *) gdisp_ptr;
gdisplay_untransform_coords (gdisp, mevent->x, mevent->y, &x, &y, FALSE, FALSE);
if ((layer = gimage_get_active_layer (gdisp->gimage)))
if (x >= layer->offset_x && y >= layer->offset_y &&
x < (layer->offset_x + layer->width) &&
y < (layer->offset_y + layer->height))
{
/* One more test--is there a selected region?
* if so, is cursor inside?
*/
if (gimage_mask_is_empty (gdisp->gimage))
ctype = GDK_PENCIL;
else if (gimage_mask_value (gdisp->gimage, x, y))
ctype = GDK_PENCIL;
}
gdisplay_install_tool_cursor (gdisp, ctype);
}
void
paint_core_control (tool, action, gdisp_ptr)
Tool * tool;
int action;
gpointer gdisp_ptr;
{
PaintCore * paint_core;
GDisplay *gdisp;
int drawable_id;
gdisp = (GDisplay *) gdisp_ptr;
paint_core = (PaintCore *) tool->private;
drawable_id = gimage_active_drawable (gdisp->gimage);
switch (action)
{
case PAUSE :
draw_core_pause (paint_core->core, tool);
break;
case RESUME :
draw_core_resume (paint_core->core, tool);
break;
case HALT :
(* paint_core->paint_func) (paint_core, drawable_id, FINISH_PAINT);
paint_core_cleanup ();
break;
}
}
void
paint_core_no_draw (tool)
Tool * tool;
{
return;
}
Tool *
paint_core_new (type)
int type;
{
Tool * tool;
PaintCore * private;
tool = (Tool *) g_malloc (sizeof (Tool));
private = (PaintCore *) g_malloc (sizeof (PaintCore));
private->core = draw_core_new (paint_core_no_draw);
tool->type = type;
tool->state = INACTIVE;
tool->scroll_lock = 0; /* Allow scrolling */
tool->auto_snap_to = TRUE;
tool->gdisp_ptr = NULL;
tool->private = (void *) private;
tool->button_press_func = paint_core_button_press;
tool->button_release_func = paint_core_button_release;
tool->motion_func = paint_core_motion;
tool->arrow_keys_func = standard_arrow_keys_func;
tool->cursor_update_func = paint_core_cursor_update;
tool->control_func = paint_core_control;
return tool;
}
void
paint_core_free (tool)
Tool * tool;
{
PaintCore * paint_core;
paint_core = (PaintCore *) tool->private;
/* Make sure the selection core is not visible */
if (tool->state == ACTIVE && paint_core->core)
draw_core_stop (paint_core->core, tool);
/* Free the selection core */
if (paint_core->core)
draw_core_free (paint_core->core);
/* Cleanup memory */
paint_core_cleanup ();
/* Free the paint core */
g_free (paint_core);
}
int
paint_core_init (paint_core, drawable_id, x, y)
PaintCore *paint_core;
int drawable_id;
double x, y;
{
GBrushP brush;
paint_core->curx = x;
paint_core->cury = y;
/* Each buffer is the same size as the maximum bounds of the active brush... */
if (!(brush = get_active_brush ()))
{
warning ("No brushes available for use with this tool.");
return FALSE;
}
paint_core->spacing =
(double) MAXIMUM (brush->mask->width, brush->mask->height) *
((double) get_brush_spacing () / 100.0);
if (paint_core->spacing < 1.0)
paint_core->spacing = 1.0;
paint_core->brush_mask = brush->mask;
/* free the block structures */
if (undo_tiles)
tile_manager_destroy (undo_tiles);
if (canvas_tiles)
tile_manager_destroy (canvas_tiles);
/* Allocate the undo structure */
undo_tiles = tile_manager_new (drawable_width (drawable_id),
drawable_height (drawable_id),
drawable_bytes (drawable_id));
/* Allocate the canvas blocks structure */
canvas_tiles = tile_manager_new (drawable_width (drawable_id),
drawable_height (drawable_id), 1);
/* Get the initial undo extents */
paint_core->x1 = paint_core->x2 = paint_core->curx;
paint_core->y1 = paint_core->y2 = paint_core->cury;
paint_core->distance = 0.0;
return TRUE;
}
void
paint_core_interpolate (paint_core, drawable_id)
PaintCore *paint_core;
int drawable_id;
{
int n;
double dx, dy;
double left;
double t;
double initial;
double dist;
double total;
dx = paint_core->curx - paint_core->lastx;
dy = paint_core->cury - paint_core->lasty;
if (!dx && !dy)
return;
dist = sqrt (SQR (dx) + SQR (dy));
total = dist + paint_core->distance;
initial = paint_core->distance;
while (paint_core->distance < total)
{
n = (int) (paint_core->distance / paint_core->spacing + 1.0 + EPSILON);
left = n * paint_core->spacing - paint_core->distance;
paint_core->distance += left;
if (paint_core->distance <= total)
{
t = (paint_core->distance - initial) / dist;
paint_core->curx = paint_core->lastx + dx * t;
paint_core->cury = paint_core->lasty + dy * t;
(* paint_core->paint_func) (paint_core, drawable_id, MOTION_PAINT);
}
}
paint_core->distance = total;
paint_core->curx = paint_core->lastx + dx;
paint_core->cury = paint_core->lasty + dy;
}
void
paint_core_finish (paint_core, drawable_id, tool_id)
PaintCore *paint_core;
int drawable_id;
int tool_id;
{
GImage *gimage;
PaintUndo *pu;
if (! (gimage = drawable_gimage (drawable_id)))
return;
/* Determine if any part of the image has been altered--
* if nothing has, then just return...
*/
if ((paint_core->x2 == paint_core->x1) || (paint_core->y2 == paint_core->y1))
return;
undo_push_group_start (gimage, PAINT_CORE_UNDO);
pu = (PaintUndo *) g_malloc (sizeof (PaintUndo));
pu->tool_ID = tool_id;
pu->lastx = paint_core->startx;
pu->lasty = paint_core->starty;
/* Push a paint undo */
undo_push_paint (gimage, pu);
/* push an undo */
drawable_apply_image (drawable_id, paint_core->x1, paint_core->y1,
paint_core->x2, paint_core->y2, undo_tiles, TRUE);
undo_tiles = NULL;
/* push the group end */
undo_push_group_end (gimage);
/* invalidate the drawable--have to do it here, because
* it is not done during the actual painting.
*/
drawable_invalidate_preview (drawable_id);
}
void
paint_core_cleanup ()
{
/* CLEANUP */
/* If the undo tiles exist, nuke them */
if (undo_tiles)
{
tile_manager_destroy (undo_tiles);
undo_tiles = NULL;
}
/* If the canvas blocks exist, nuke them */
if (canvas_tiles)
{
tile_manager_destroy (canvas_tiles);
canvas_tiles = NULL;
}
/* Free the temporary buffers if they exist */
free_paint_buffers ();
}
/************************/
/* Painting functions */
/************************/
TempBuf *
paint_core_get_paint_area (paint_core, drawable_id)
PaintCore *paint_core;
int drawable_id;
{
int x, y;
int x1, y1, x2, y2;
int bytes;
bytes = drawable_has_alpha (drawable_id) ?
drawable_bytes (drawable_id) : drawable_bytes (drawable_id) + 1;
/* adjust the x and y coordinates to the upper left corner of the brush */
x = (int) paint_core->curx - (paint_core->brush_mask->width >> 1);
y = (int) paint_core->cury - (paint_core->brush_mask->height >> 1);
x1 = BOUNDS (x - 1, 0, drawable_width (drawable_id));
y1 = BOUNDS (y - 1, 0, drawable_height (drawable_id));
x2 = BOUNDS (x + paint_core->brush_mask->width + 1,
0, drawable_width (drawable_id));
y2 = BOUNDS (y + paint_core->brush_mask->height + 1,
0, drawable_height (drawable_id));
/* configure the canvas buffer */
if ((x2 - x1) && (y2 - y1))
canvas_buf = temp_buf_resize (canvas_buf, bytes, x1, y1,
(x2 - x1), (y2 - y1));
else
return NULL;
return canvas_buf;
}
TempBuf *
paint_core_get_orig_image (paint_core, drawable_id, x1, y1, x2, y2)
PaintCore *paint_core;
int drawable_id;
int x1, y1;
int x2, y2;
{
PixelRegion srcPR, destPR;
Tile *undo_tile;
int h;
int pixelwidth;
int refd;
unsigned char * s, * d;
void * pr;
orig_buf = temp_buf_resize (orig_buf, drawable_bytes (drawable_id),
x1, y1, (x2 - x1), (y2 - y1));
x1 = BOUNDS (x1, 0, drawable_width (drawable_id));
y1 = BOUNDS (y1, 0, drawable_height (drawable_id));
x2 = BOUNDS (x2, 0, drawable_width (drawable_id));
y2 = BOUNDS (y2, 0, drawable_height (drawable_id));
/* configure the pixel regions */
pixel_region_init (&srcPR, drawable_data (drawable_id), x1, y1, (x2 - x1), (y2 - y1), FALSE);
destPR.bytes = orig_buf->bytes;
destPR.x = 0; destPR.y = 0;
destPR.w = (x2 - x1); destPR.h = (y2 - y1);
destPR.rowstride = orig_buf->bytes * orig_buf->width;
destPR.data = temp_buf_data (orig_buf) +
(y1 - orig_buf->y) * destPR.rowstride + (x1 - orig_buf->x) * destPR.bytes;
for (pr = pixel_regions_register (2, &srcPR, &destPR); pr != NULL; pr = pixel_regions_process (pr))
{
/* If the undo tile corresponding to this location is valid, use it */
undo_tile = tile_manager_get_tile (undo_tiles, srcPR.x, srcPR.y, 0);
if (undo_tile->valid == TRUE)
{
tile_ref (undo_tile);
s = undo_tile->data + srcPR.rowstride * (srcPR.y % TILE_HEIGHT) +
srcPR.bytes * (srcPR.x % TILE_WIDTH);
refd = TRUE;
}
else
{
s = srcPR.data;
refd = FALSE;
}
d = destPR.data;
pixelwidth = srcPR.w * srcPR.bytes;
h = srcPR.h;
while (h --)
{
memcpy (d, s, pixelwidth);
s += srcPR.rowstride;
d += destPR.rowstride;
}
if (refd)
tile_unref (undo_tile, FALSE);
}
return orig_buf;
}
void
paint_core_paste_canvas (paint_core, drawable_id, brush_opacity, image_opacity, paint_mode,
brush_hardness, mode)
PaintCore *paint_core;
int drawable_id;
int brush_opacity;
int image_opacity;
int paint_mode;
int brush_hardness;
int mode;
{
MaskBuf *brush_mask;
/* get the brush mask */
brush_mask = paint_core_get_brush_mask (paint_core, brush_hardness);
/* paste the canvas buf */
paint_core_paste (paint_core, brush_mask, drawable_id,
brush_opacity, image_opacity, paint_mode, mode);
}
/* Similar to paint_core_paste_canvas, but replaces the alpha channel
rather than using it to composite (i.e. transparent over opaque
becomes transparent rather than opauqe. */
void
paint_core_replace_canvas (paint_core, drawable_id, brush_opacity, image_opacity,
brush_hardness, mode)
PaintCore *paint_core;
int drawable_id;
int brush_opacity;
int image_opacity;
int brush_hardness;
int mode;
{
MaskBuf *brush_mask;
/* get the brush mask */
brush_mask = paint_core_get_brush_mask (paint_core, brush_hardness);
/* paste the canvas buf */
paint_core_replace (paint_core, brush_mask, drawable_id,
brush_opacity, image_opacity, mode);
}
/************************************************************
* LOCAL FUNCTION DEFINITIONS *
************************************************************/
static MaskBuf *
paint_core_subsample_mask (mask, x, y)
MaskBuf * mask;
double x, y;
{
static MaskBuf *last_brush = NULL;
MaskBuf * dest;
double left;
unsigned char * m, * d;
int * k;
int index1, index2;
int * kernel;
int new_val;
int i, j;
int r, s;
x += (x < 0) ? mask->width : 0;
left = x - ((int) x);
index1 = (int) (left * 4);
index1 = (index1 < 0) ? 0 : index1;
y += (y < 0) ? mask->height : 0;
left = y - ((int) y);
index2 = (int) (left * 4);
index2 = (index2 < 0) ? 0 : index2;
kernel = subsample[index2][index1];
if ((mask == last_brush) && kernel_brushes[index2][index1])
return kernel_brushes[index2][index1];
else if (mask != last_brush)
for (i = 0; i < 4; i++)
for (j = 0; j < 4; j++)
{
if (kernel_brushes[i][j])
mask_buf_free (kernel_brushes[i][j]);
kernel_brushes[i][j] = NULL;
}
last_brush = mask;
kernel_brushes[index2][index1] = mask_buf_new (mask->width + 2, mask->height + 2);
dest = kernel_brushes[index2][index1];
m = mask_buf_data (mask);
for (i = 0; i < mask->height; i++)
{
for (j = 0; j < mask->width; j++)
{
k = kernel;
for (r = 0; r < KERNEL_HEIGHT; r++)
{
d = mask_buf_data (dest) + (i+r) * dest->width + j;
s = KERNEL_WIDTH;
while (s--)
{
new_val = *d + ((*m * *k++) >> 8);
*d++ = (new_val > 255) ? 255 : new_val;
}
}
m++;
}
}
return dest;
}
static MaskBuf *
paint_core_solidify_mask (brush_mask)
MaskBuf * brush_mask;
{
static MaskBuf *last_brush = NULL;
int i, j;
unsigned char * data, * src;
if (brush_mask == last_brush)
return solid_brush;
last_brush = brush_mask;
if (solid_brush)
mask_buf_free (solid_brush);
solid_brush = mask_buf_new (brush_mask->width + 2, brush_mask->height + 2);
/* get the data and advance one line into it */
data = mask_buf_data (solid_brush) + solid_brush->width;
src = mask_buf_data (brush_mask);
for (i = 0; i < brush_mask->height; i++)
{
data++;
for (j = 0; j < brush_mask->width; j++)
{
*data++ = (*src++) ? OPAQUE : TRANSPARENT;
}
data++;
}
return solid_brush;
}
static MaskBuf *
paint_core_get_brush_mask (paint_core, brush_hardness)
PaintCore * paint_core;
int brush_hardness;
{
MaskBuf * bm;
switch (brush_hardness)
{
case SOFT:
bm = paint_core_subsample_mask (paint_core->brush_mask, paint_core->curx, paint_core->cury);
break;
case HARD:
bm = paint_core_solidify_mask (paint_core->brush_mask);
break;
default:
bm = NULL;
break;
}
return bm;
}
static void
paint_core_paste (paint_core, brush_mask, drawable_id, brush_opacity, image_opacity, paint_mode, mode)
PaintCore *paint_core;
MaskBuf *brush_mask;
int drawable_id;
int brush_opacity;
int image_opacity;
int paint_mode;
int mode;
{
GImage *gimage;
PixelRegion srcPR;
TileManager *alt = NULL;
int offx, offy;
if (! (gimage = drawable_gimage (drawable_id)))
return;
/* set undo blocks */
set_undo_tiles (drawable_id,
canvas_buf->x, canvas_buf->y,
canvas_buf->width, canvas_buf->height);
/* If the mode is CONSTANT:
* combine the canvas buf, the brush mask to the canvas tiles
*/
if (mode == CONSTANT)
{
/* initialize any invalid canvas tiles */
set_canvas_tiles (canvas_buf->x, canvas_buf->y,
canvas_buf->width, canvas_buf->height);
paint_to_canvas_tiles (paint_core, brush_mask, brush_opacity);
alt = undo_tiles;
}
/* Otherwise:
* combine the canvas buf and the brush mask to the canvas buf
*/
else /* mode != CONSTANT */
paint_to_canvas_buf (paint_core, brush_mask, brush_opacity);
/* intialize canvas buf source pixel regions */
srcPR.bytes = canvas_buf->bytes;
srcPR.x = 0; srcPR.y = 0;
srcPR.w = canvas_buf->width;
srcPR.h = canvas_buf->height;
srcPR.rowstride = canvas_buf->width * canvas_buf->bytes;
srcPR.data = temp_buf_data (canvas_buf);
/* apply the paint area to the gimage */
gimage_apply_image (gimage, drawable_id, &srcPR,
FALSE, image_opacity, paint_mode,
alt, /* specify an alternative src1 */
canvas_buf->x, canvas_buf->y);
/* Update the undo extents */
paint_core->x1 = MINIMUM (paint_core->x1, canvas_buf->x);
paint_core->y1 = MINIMUM (paint_core->y1, canvas_buf->y);
paint_core->x2 = MAXIMUM (paint_core->x2, (canvas_buf->x + canvas_buf->width));
paint_core->y2 = MAXIMUM (paint_core->y2, (canvas_buf->y + canvas_buf->height));
/* Update the gimage--it is important to call gdisplays_update_area
* instead of drawable_update because we don't want the drawable
* preview to be constantly invalidated
*/
drawable_offsets (drawable_id, &offx, &offy);
gdisplays_update_area (gimage->ID, canvas_buf->x + offx, canvas_buf->y + offy,
canvas_buf->width, canvas_buf->height);
}
/* This works similarly to paint_core_paste. However, instead of combining
the canvas to the paint core drawable using one of the combination
modes, it uses a "replace" mode (i.e. transparent pixels in the
canvas erase the paint core drawable).
When not drawing on alpha-enabled images, it just paints using NORMAL
mode.
*/
static void
paint_core_replace (paint_core, brush_mask, drawable_id, brush_opacity, image_opacity, mode)
PaintCore *paint_core;
MaskBuf *brush_mask;
int drawable_id;
int brush_opacity;
int image_opacity;
int mode;
{
GImage *gimage;
PixelRegion srcPR, maskPR;
int offx, offy;
if (!drawable_has_alpha (drawable_id))
{
paint_core_paste (paint_core, brush_mask, drawable_id,
brush_opacity, image_opacity, NORMAL_MODE,
mode);
return;
}
if (mode != INCREMENTAL)
{
g_warning ("paint_core_replace only works in INCREMENTAL mode");
return;
}
if (! (gimage = drawable_gimage (drawable_id)))
return;
/* set undo blocks */
set_undo_tiles (drawable_id,
canvas_buf->x, canvas_buf->y,
canvas_buf->width, canvas_buf->height);
maskPR.bytes = 1;
maskPR.x = 0; maskPR.y = 0;
maskPR.w = srcPR.w;
maskPR.h = srcPR.h;
maskPR.rowstride = maskPR.bytes * brush_mask->width;
maskPR.data = mask_buf_data (brush_mask);
/* intialize canvas buf source pixel regions */
srcPR.bytes = canvas_buf->bytes;
srcPR.x = 0; srcPR.y = 0;
srcPR.w = canvas_buf->width;
srcPR.h = canvas_buf->height;
srcPR.rowstride = canvas_buf->width * canvas_buf->bytes;
srcPR.data = temp_buf_data (canvas_buf);
/* apply the paint area to the gimage */
gimage_replace_image (gimage, drawable_id, &srcPR,
FALSE, image_opacity,
&maskPR,
canvas_buf->x, canvas_buf->y);
/* Update the undo extents */
paint_core->x1 = MINIMUM (paint_core->x1, canvas_buf->x);
paint_core->y1 = MINIMUM (paint_core->y1, canvas_buf->y);
paint_core->x2 = MAXIMUM (paint_core->x2, (canvas_buf->x + canvas_buf->width));
paint_core->y2 = MAXIMUM (paint_core->y2, (canvas_buf->y + canvas_buf->height));
/* Update the gimage--it is important to call gdisplays_update_area
* instead of drawable_update because we don't want the drawable
* preview to be constantly invalidated
*/
drawable_offsets (drawable_id, &offx, &offy);
gdisplays_update_area (gimage->ID, canvas_buf->x + offx, canvas_buf->y + offy,
canvas_buf->width, canvas_buf->height);
}
static void
paint_to_canvas_tiles (paint_core, brush_mask, brush_opacity)
PaintCore *paint_core;
MaskBuf *brush_mask;
int brush_opacity;
{
PixelRegion srcPR, maskPR;
int x, y;
int xoff, yoff;
/* combine the brush mask and the canvas tiles */
pixel_region_init (&srcPR, canvas_tiles,
canvas_buf->x, canvas_buf->y,
canvas_buf->width, canvas_buf->height, TRUE);
x = (int) paint_core->curx - (brush_mask->width >> 1);
y = (int) paint_core->cury - (brush_mask->height >> 1);
xoff = (x < 0) ? -x : 0;
yoff = (y < 0) ? -y : 0;
maskPR.bytes = 1;
maskPR.x = 0; maskPR.y = 0;
maskPR.w = srcPR.w;
maskPR.h = srcPR.h;
maskPR.rowstride = maskPR.bytes * brush_mask->width;
maskPR.data = mask_buf_data (brush_mask) + yoff * maskPR.rowstride + xoff * maskPR.bytes;
/* combine the mask and canvas tiles */
combine_mask_and_region (&srcPR, &maskPR, brush_opacity);
/* combine the canvas tiles and the canvas buf */
srcPR.bytes = canvas_buf->bytes;
srcPR.x = 0; srcPR.y = 0;
srcPR.w = canvas_buf->width;
srcPR.h = canvas_buf->height;
srcPR.rowstride = canvas_buf->width * canvas_buf->bytes;
srcPR.data = temp_buf_data (canvas_buf);
pixel_region_init (&maskPR, canvas_tiles,
canvas_buf->x, canvas_buf->y,
canvas_buf->width, canvas_buf->height, FALSE);
/* apply the canvas tiles to the canvas buf */
apply_mask_to_region (&srcPR, &maskPR, OPAQUE);
}
static void
paint_to_canvas_buf (paint_core, brush_mask, brush_opacity)
PaintCore *paint_core;
MaskBuf *brush_mask;
int brush_opacity;
{
PixelRegion srcPR, maskPR;
/* combine the canvas buf and the brush mask to the canvas buf */
srcPR.bytes = canvas_buf->bytes;
srcPR.x = 0; srcPR.y = 0;
srcPR.w = canvas_buf->width;
srcPR.h = canvas_buf->height;
srcPR.rowstride = canvas_buf->width * canvas_buf->bytes;
srcPR.data = temp_buf_data (canvas_buf);
maskPR.bytes = 1;
maskPR.x = 0; maskPR.y = 0;
maskPR.w = srcPR.w;
maskPR.h = srcPR.h;
maskPR.rowstride = maskPR.bytes * brush_mask->width;
maskPR.data = mask_buf_data (brush_mask);
/* apply the mask */
apply_mask_to_region (&srcPR, &maskPR, brush_opacity);
}
static void
set_undo_tiles (drawable_id, x, y, w, h)
int drawable_id;
int x, y;
int w, h;
{
int i, j;
Tile *src_tile;
Tile *dest_tile;
for (i = y; i < (y + h); i += (TILE_HEIGHT - (i % TILE_HEIGHT)))
{
for (j = x; j < (x + w); j += (TILE_WIDTH - (j % TILE_WIDTH)))
{
dest_tile = tile_manager_get_tile (undo_tiles, j, i, 0);
if (dest_tile->valid == FALSE)
{
src_tile = tile_manager_get_tile (drawable_data (drawable_id), j, i, 0);
tile_ref (src_tile);
tile_ref (dest_tile);
memcpy (dest_tile->data, src_tile->data,
(src_tile->ewidth * src_tile->eheight * src_tile->bpp));
tile_unref (src_tile, FALSE);
tile_unref (dest_tile, TRUE);
}
}
}
}
static void
set_canvas_tiles (x, y, w, h)
int x, y;
int w, h;
{
int i, j;
Tile *tile;
for (i = y; i < (y + h); i += (TILE_HEIGHT - (i % TILE_HEIGHT)))
{
for (j = x; j < (x + w); j += (TILE_WIDTH - (j % TILE_WIDTH)))
{
tile = tile_manager_get_tile (canvas_tiles, j, i, 0);
if (tile->valid == FALSE)
{
tile_ref (tile);
memset (tile->data, 0, (tile->ewidth * tile->eheight * tile->bpp));
tile_unref (tile, TRUE);
}
}
}
}
/*****************************************************/
/* Paint buffers utility functions */
/*****************************************************/
static void
free_paint_buffers ()
{
if (orig_buf)
temp_buf_free (orig_buf);
orig_buf = NULL;
if (canvas_buf)
temp_buf_free (canvas_buf);
canvas_buf = NULL;
}
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