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gimp/app/transform_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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include <stdlib.h>
#include "appenv.h"
#include "cursorutil.h"
#include "drawable.h"
#include "errors.h"
#include "floating_sel.h"
#include "gdisplay.h"
#include "gimage_mask.h"
#include "gimprc.h"
#include "gimpui.h"
#include "info_dialog.h"
#include "interface.h"
#include "transform_core.h"
#include "transform_tool.h"
#include "temp_buf.h"
#include "tools.h"
#include "undo.h"
#include "layer_pvt.h"
#include "drawable_pvt.h"
#include "tile_manager_pvt.h"
#include "tile.h" /* ick. */
#include "libgimp/gimpintl.h"
#include "libgimp/gimpmath.h"
#define BILINEAR(jk,j1k,jk1,j1k1,dx,dy) \
((1-dy) * (jk + dx * (j1k - jk)) + \
dy * (jk1 + dx * (j1k1 - jk1)))
/* variables */
static TranInfo old_trans_info;
InfoDialog * transform_info = NULL;
static gboolean transform_info_inited = FALSE;
/* forward function declarations */
static int transform_core_bounds (Tool *, void *);
static void * transform_core_recalc (Tool *, void *);
static void transform_core_doit (Tool *, gpointer);
static double cubic (double, int, int, int, int);
static void transform_core_setup_grid (Tool *);
static void transform_core_grid_recalc (TransformCore *);
/* Hmmm... Should be in a headerfile but which? */
void paths_draw_current(GDisplay *,DrawCore *,GimpMatrix);
#define BILINEAR(jk,j1k,jk1,j1k1,dx,dy) \
((1-dy) * (jk + dx * (j1k - jk)) + \
dy * (jk1 + dx * (j1k1 - jk1)))
/* access interleaved pixels */
#define CUBIC_ROW(dx, row, step) \
cubic(dx, (row)[0], (row)[step], (row)[step+step], (row)[step+step+step])
#define CUBIC_SCALED_ROW(dx, row, step, i) \
cubic(dx, (row)[0] * (row)[i], \
(row)[step] * (row)[step + i], \
(row)[step+step]* (row)[step+step + i], \
(row)[step+step+step] * (row)[step+step+step + i])
#define REF_TILE(i,x,y) \
tile[i] = tile_manager_get_tile (float_tiles, x, y, TRUE, FALSE); \
src[i] = tile_data_pointer (tile[i], (x) % TILE_WIDTH, (y) % TILE_HEIGHT);
/* This should be migrated to pixel_region or similar... */
/* PixelSurround describes a (read-only)
* region around a pixel in a tile manager
*/
typedef struct _PixelSurround
{
Tile *tile;
TileManager *mgr;
guchar *buff;
gint buff_size;
gint bpp;
gint w;
gint h;
guchar bg[MAX_CHANNELS];
gint row_stride;
} PixelSurround;
static void
pixel_surround_init (PixelSurround *ps,
TileManager *t,
int w,
int h,
guchar bg[MAX_CHANNELS])
{
int i;
for (i = 0; i < MAX_CHANNELS; ++i) {
ps->bg[i] = bg[i];
}
ps->tile = 0;
ps->mgr = t;
ps->bpp = tile_manager_level_bpp(t);
ps->w = w;
ps->h = h;
/* make sure buffer is big enough */
ps->buff_size = w * h * ps->bpp;
ps->buff = g_malloc(ps->buff_size);
ps->row_stride = 0;
}
/* return a pointer to a buffer which contains all the surrounding pixels */
/* strategy: if we are in the middle of a tile, use the tile storage */
/* otherwise just copy into out own malloced buffer and return that */
static guchar *
pixel_surround_lock (PixelSurround *ps,
int x,
int y)
{
int i, j;
unsigned char* k;
unsigned char* ptr;
ps->tile = tile_manager_get_tile(ps->mgr, x, y, TRUE, FALSE);
i = x % TILE_WIDTH;
j = y % TILE_HEIGHT;
/* do we have the whole region? */
if (ps->tile && (i < (tile_ewidth(ps->tile) - ps->w)) &&
(j < (tile_eheight(ps->tile) - ps->h))) {
ps->row_stride = tile_ewidth(ps->tile) * ps->bpp;
/* is this really the correct way? */
return tile_data_pointer(ps->tile, i, j);
}
/* nope, do this the hard way (for now) */
if (ps->tile) {
tile_release(ps->tile, FALSE);
ps->tile = 0;
}
/* copy pixels, one by one */
/* no, this is not the best way, but it's much better than before */
ptr = ps->buff;
for (j = y; j < y+ps->h; ++j) {
for (i = x; i < x+ps->w; ++i) {
Tile* tile = tile_manager_get_tile (ps->mgr, i, j, TRUE, FALSE);
if (tile) {
unsigned char* buff = tile_data_pointer (tile, i % TILE_WIDTH, j % TILE_HEIGHT);
for (k = buff; k < buff+ps->bpp; ++k, ++ptr) {
*ptr = *k;
}
tile_release(tile, FALSE);
} else {
for (k = ps->bg; k < ps->bg+ps->bpp; ++k, ++ptr) {
*ptr = *k;
}
}
}
}
ps->row_stride = ps->w * ps->bpp;
return ps->buff;
}
static int
pixel_surround_rowstride (PixelSurround *ps)
{
return ps->row_stride;
}
static void
pixel_surround_release (PixelSurround *ps)
{
/* always get new tile (for now), so release the old one */
if (ps->tile)
{
tile_release(ps->tile, FALSE);
ps->tile = 0;
}
}
static void
pixel_surround_clear (PixelSurround *ps)
{
if (ps->buff)
{
g_free (ps->buff);
ps->buff = 0;
ps->buff_size = 0;
}
}
static void
transform_ok_callback (GtkWidget *w,
gpointer client_data)
{
Tool *tool;
tool = (Tool *) client_data;
transform_core_doit (tool, tool->gdisp_ptr);
}
static void
transform_reset_callback (GtkWidget *w,
gpointer client_data)
{
Tool *tool;
TransformCore *transform_core;
int i;
tool = (Tool *) client_data;
transform_core = (TransformCore *) tool->private;
/* stop the current tool drawing process */
draw_core_pause (transform_core->core, tool);
/* Restore the previous transformation info */
for (i = 0; i < TRAN_INFO_SIZE; i++)
transform_core->trans_info [i] = old_trans_info [i];
/* recalculate the tool's transformation matrix */
transform_core_recalc (tool, tool->gdisp_ptr);
/* resume drawing the current tool */
draw_core_resume (transform_core->core, tool);
}
static const gchar *action_labels[] =
{
N_("Rotate"),
N_("Scale"),
N_("Shear"),
N_("Transform")
};
void
transform_core_button_press (Tool *tool,
GdkEventButton *bevent,
gpointer gdisp_ptr)
{
TransformCore * transform_core;
GDisplay * gdisp;
Layer * layer;
GimpDrawable * drawable;
int dist;
int closest_dist;
int x, y;
int i;
int off_x, off_y;
gdisp = (GDisplay *) gdisp_ptr;
transform_core = (TransformCore *) tool->private;
transform_core->bpressed = TRUE; /* ALT */
drawable = gimage_active_drawable (gdisp->gimage);
if (transform_core->function == CREATING && tool->state == ACTIVE)
{
/* Save the current transformation info */
for (i = 0; i < TRAN_INFO_SIZE; i++)
old_trans_info [i] = transform_core->trans_info [i];
}
/* if we have already displayed the bounding box and handles,
* check to make sure that the display which currently owns the
* tool is the one which just received the button pressed event
*/
if ((gdisp == tool->gdisp_ptr) && transform_core->interactive)
{
/* start drawing the bounding box and handles... */
draw_core_start (transform_core->core, gdisp->canvas->window, tool);
x = bevent->x;
y = bevent->y;
closest_dist = SQR (x - transform_core->sx1) + SQR (y - transform_core->sy1);
transform_core->function = HANDLE_1;
dist = SQR (x - transform_core->sx2) + SQR (y - transform_core->sy2);
if (dist < closest_dist)
{
closest_dist = dist;
transform_core->function = HANDLE_2;
}
dist = SQR (x - transform_core->sx3) + SQR (y - transform_core->sy3);
if (dist < closest_dist)
{
closest_dist = dist;
transform_core->function = HANDLE_3;
}
dist = SQR (x - transform_core->sx4) + SQR (y - transform_core->sy4);
if (dist < closest_dist)
{
closest_dist = dist;
transform_core->function = HANDLE_4;
}
if (tool->type == ROTATE
&& (SQR (x - transform_core->scx) +
SQR (y - transform_core->scy)) <= 100)
{
transform_core->function = HANDLE_CENTER;
}
/* Save the current pointer position */
gdisplay_untransform_coords (gdisp, bevent->x, bevent->y,
&transform_core->startx,
&transform_core->starty, TRUE, 0);
transform_core->lastx = transform_core->startx;
transform_core->lasty = transform_core->starty;
gdk_pointer_grab (gdisp->canvas->window, FALSE,
GDK_POINTER_MOTION_HINT_MASK | GDK_BUTTON1_MOTION_MASK | GDK_BUTTON_RELEASE_MASK,
NULL, NULL, bevent->time);
tool->state = ACTIVE;
return;
}
/* Initialisation stuff: if the cursor is clicked inside the current
* selection, show the bounding box and handles... */
gdisplay_untransform_coords (gdisp, bevent->x, bevent->y, &x, &y, FALSE, FALSE);
if ((layer = gimage_get_active_layer (gdisp->gimage)))
{
drawable_offsets (GIMP_DRAWABLE (layer), &off_x, &off_y);
if (x >= off_x && y >= off_y &&
x < (off_x + drawable_width (GIMP_DRAWABLE(layer))) &&
y < (off_y + drawable_height (GIMP_DRAWABLE(layer))))
if (gimage_mask_is_empty (gdisp->gimage) ||
gimage_mask_value (gdisp->gimage, x, y))
{
if (layer->mask != NULL && GIMP_DRAWABLE (layer->mask))
{
g_message (_("Transformations do not work on\nlayers that contain layer masks."));
tool->state = INACTIVE;
return;
}
/* If the tool is already active, clear the current state
* and reset */
if (tool->state == ACTIVE)
transform_core_reset (tool, gdisp_ptr);
/* Set the pointer to the active display */
tool->gdisp_ptr = gdisp;
tool->drawable = drawable;
tool->state = ACTIVE;
/* Grab the pointer if we're in non-interactive mode */
if (!transform_core->interactive)
gdk_pointer_grab (gdisp->canvas->window, FALSE,
(GDK_POINTER_MOTION_HINT_MASK |
GDK_BUTTON1_MOTION_MASK |
GDK_BUTTON_RELEASE_MASK),
NULL, NULL, bevent->time);
/* Find the transform bounds for some tools (like scale,
* perspective) that actually need the bounds for
* initializing */
transform_core_bounds (tool, gdisp_ptr);
/* Calculate the grid line endpoints */
if (transform_tool_show_grid ())
transform_core_setup_grid (tool);
/* Initialize the transform tool */
(* transform_core->trans_func) (tool, gdisp_ptr, INIT);
if (transform_info != NULL && !transform_info_inited)
{
gimp_dialog_create_action_area
(GTK_DIALOG (transform_info->shell),
gettext (action_labels[tool->type - ROTATE]),
transform_ok_callback,
tool, NULL, TRUE, FALSE,
_("Reset"), transform_reset_callback,
tool, NULL, FALSE, FALSE,
NULL);
transform_info_inited = TRUE;
}
/* Recalculate the transform tool */
transform_core_recalc (tool, gdisp_ptr);
/* recall this function to find which handle we're dragging */
if (transform_core->interactive)
transform_core_button_press (tool, bevent, gdisp_ptr);
}
}
}
void
transform_core_button_release (Tool *tool,
GdkEventButton *bevent,
gpointer gdisp_ptr)
{
GDisplay *gdisp;
TransformCore *transform_core;
int i;
gdisp = (GDisplay *) gdisp_ptr;
transform_core = (TransformCore *) tool->private;
transform_core->bpressed = FALSE; /* ALT */
/* if we are creating, there is nothing to be done...exit */
if (transform_core->function == CREATING && transform_core->interactive)
return;
/* release of the pointer grab */
gdk_pointer_ungrab (bevent->time);
gdk_flush ();
/* if the 3rd button isn't pressed, transform the selected mask */
if (! (bevent->state & GDK_BUTTON3_MASK))
{
/* Shift-clicking is another way to approve the transform */
if ((bevent->state & GDK_SHIFT_MASK) || (tool->type == FLIP))
{
transform_core_doit (tool, gdisp_ptr);
}
else
{
/* Only update the paths preview */
paths_transform_current_path(gdisp->gimage,transform_core->transform,TRUE);
}
}
else
{
/* stop the current tool drawing process */
draw_core_pause (transform_core->core, tool);
/* Restore the previous transformation info */
for (i = 0; i < TRAN_INFO_SIZE; i++)
transform_core->trans_info [i] = old_trans_info [i];
/* recalculate the tool's transformation matrix */
transform_core_recalc (tool, gdisp_ptr);
/* resume drawing the current tool */
draw_core_resume (transform_core->core, tool);
/* Update the paths preview */
paths_transform_current_path(gdisp->gimage,transform_core->transform,TRUE);
}
/* if this tool is non-interactive, make it inactive after use */
if (!transform_core->interactive)
tool->state = INACTIVE;
}
void
transform_core_doit (Tool *tool,
gpointer gdisp_ptr)
{
GDisplay *gdisp;
void *pundo;
TransformCore *transform_core;
TileManager *new_tiles;
TransformUndo *tu;
int new_layer;
int i, x, y;
gimp_add_busy_cursors();
gdisp = (GDisplay *) gdisp_ptr;
transform_core = (TransformCore *) tool->private;
/* undraw the tool before we muck around with the transform matrix */
draw_core_pause (transform_core->core, tool);
/* We're going to dirty this image, but we want to keep the tool
* around
*/
tool->preserve = TRUE;
/* Start a transform undo group */
undo_push_group_start (gdisp->gimage, TRANSFORM_CORE_UNDO);
/* With the old UI, if original is NULL, then this is the
first transformation. In the new UI, it is always so, yes? */
g_assert (transform_core->original == NULL);
/* If we're in interactive mode, we need to copy the current
* selection to the transform tool's private selection pointer, so
* that the original source can be repeatedly modified.
*/
tool->drawable = gimage_active_drawable (gdisp->gimage);
transform_core->original = transform_core_cut (gdisp->gimage,
tool->drawable,
&new_layer);
pundo = paths_transform_start_undo (gdisp->gimage);
/* Send the request for the transformation to the tool...
*/
new_tiles = (* transform_core->trans_func) (tool, gdisp_ptr, FINISH);
(* transform_core->trans_func) (tool, gdisp_ptr, INIT);
transform_core_recalc (tool, gdisp_ptr);
if (new_tiles)
{
/* paste the new transformed image to the gimage...also implement
* undo...
*/
/* FIXME: we should check if the drawable is still valid */
transform_core_paste (gdisp->gimage, tool->drawable,
new_tiles, new_layer);
/* create and initialize the transform_undo structure */
tu = (TransformUndo *) g_malloc (sizeof (TransformUndo));
tu->tool_ID = tool->ID;
tu->tool_type = tool->type;
for (i = 0; i < TRAN_INFO_SIZE; i++)
tu->trans_info[i] = old_trans_info[i];
tu->original = NULL;
tu->path_undo = pundo;
/* Make a note of the new current drawable (since we may have
* a floating selection, etc now.
*/
tool->drawable = gimage_active_drawable (gdisp->gimage);
undo_push_transform (gdisp->gimage, (void *) tu);
}
/* push the undo group end */
undo_push_group_end (gdisp->gimage);
/* We're done dirtying the image, and would like to be restarted
* if the image gets dirty while the tool exists
*/
tool->preserve = FALSE;
/* Flush the gdisplays */
if (gdisp->disp_xoffset || gdisp->disp_yoffset)
{
gdk_window_get_size (gdisp->canvas->window, &x, &y);
if (gdisp->disp_yoffset)
{
gdisplay_expose_area (gdisp, 0, 0, gdisp->disp_width,
gdisp->disp_yoffset);
gdisplay_expose_area (gdisp, 0, gdisp->disp_yoffset + y,
gdisp->disp_width, gdisp->disp_height);
}
if (gdisp->disp_xoffset)
{
gdisplay_expose_area (gdisp, 0, 0, gdisp->disp_xoffset,
gdisp->disp_height);
gdisplay_expose_area (gdisp, gdisp->disp_xoffset + x, 0,
gdisp->disp_width, gdisp->disp_height);
}
}
gimp_remove_busy_cursors(NULL);
gdisplays_flush ();
transform_core_reset (tool, gdisp_ptr);
/* if this tool is non-interactive, make it inactive after use */
if (!transform_core->interactive)
tool->state = INACTIVE;
}
void
transform_core_motion (Tool *tool,
GdkEventMotion *mevent,
gpointer gdisp_ptr)
{
GDisplay *gdisp;
TransformCore *transform_core;
gdisp = (GDisplay *) gdisp_ptr;
transform_core = (TransformCore *) tool->private;
if(transform_core->bpressed == FALSE)
{
/* hey we have not got the button press yet
* so go away.
*/
return;
}
/* if we are creating or this tool is non-interactive, there is
* nothing to be done so exit.
*/
if (transform_core->function == CREATING || !transform_core->interactive)
return;
/* stop the current tool drawing process */
draw_core_pause (transform_core->core, tool);
gdisplay_untransform_coords (gdisp, mevent->x, mevent->y, &transform_core->curx,
&transform_core->cury, TRUE, 0);
transform_core->state = mevent->state;
/* recalculate the tool's transformation matrix */
(* transform_core->trans_func) (tool, gdisp_ptr, MOTION);
transform_core->lastx = transform_core->curx;
transform_core->lasty = transform_core->cury;
/* resume drawing the current tool */
draw_core_resume (transform_core->core, tool);
}
void
transform_core_cursor_update (Tool *tool,
GdkEventMotion *mevent,
gpointer gdisp_ptr)
{
GDisplay *gdisp;
TransformCore *transform_core;
Layer *layer;
int use_transform_cursor = FALSE;
GdkCursorType ctype = GDK_TOP_LEFT_ARROW;
int x, y;
gdisp = (GDisplay *) gdisp_ptr;
transform_core = (TransformCore *) tool->private;
gdisplay_untransform_coords (gdisp, mevent->x, mevent->y, &x, &y, FALSE, FALSE);
if ((layer = gimage_get_active_layer (gdisp->gimage)))
if (x >= GIMP_DRAWABLE(layer)->offset_x && y >= GIMP_DRAWABLE(layer)->offset_y &&
x < (GIMP_DRAWABLE(layer)->offset_x + GIMP_DRAWABLE(layer)->width) &&
y < (GIMP_DRAWABLE(layer)->offset_y + GIMP_DRAWABLE(layer)->height))
{
if (gimage_mask_is_empty (gdisp->gimage) ||
gimage_mask_value (gdisp->gimage, x, y))
use_transform_cursor = TRUE;
}
if (use_transform_cursor)
/* ctype based on transform tool type */
switch (tool->type)
{
case ROTATE: ctype = GDK_EXCHANGE; break;
case SCALE: ctype = GDK_SIZING; break;
case SHEAR: ctype = GDK_TCROSS; break;
case PERSPECTIVE: ctype = GDK_TCROSS; break;
default: break;
}
gdisplay_install_tool_cursor (gdisp, ctype);
}
void
transform_core_control (Tool *tool,
ToolAction action,
gpointer gdisp_ptr)
{
TransformCore * transform_core;
transform_core = (TransformCore *) tool->private;
switch (action)
{
case PAUSE:
draw_core_pause (transform_core->core, tool);
break;
case RESUME:
if (transform_core_recalc (tool, gdisp_ptr))
draw_core_resume (transform_core->core, tool);
else
{
info_dialog_popdown (transform_info);
tool->state = INACTIVE;
}
break;
case HALT:
transform_core_reset (tool, gdisp_ptr);
break;
default:
break;
}
}
void
transform_core_no_draw (Tool *tool)
{
return;
}
void
transform_core_draw (Tool *tool)
{
int x1, y1, x2, y2, x3, y3, x4, y4;
TransformCore * transform_core;
GDisplay * gdisp;
int srw, srh;
int i, k, gci;
int xa, ya, xb, yb;
gdisp = tool->gdisp_ptr;
transform_core = (TransformCore *) tool->private;
gdisplay_transform_coords (gdisp, transform_core->tx1, transform_core->ty1,
&transform_core->sx1, &transform_core->sy1, 0);
gdisplay_transform_coords (gdisp, transform_core->tx2, transform_core->ty2,
&transform_core->sx2, &transform_core->sy2, 0);
gdisplay_transform_coords (gdisp, transform_core->tx3, transform_core->ty3,
&transform_core->sx3, &transform_core->sy3, 0);
gdisplay_transform_coords (gdisp, transform_core->tx4, transform_core->ty4,
&transform_core->sx4, &transform_core->sy4, 0);
x1 = transform_core->sx1; y1 = transform_core->sy1;
x2 = transform_core->sx2; y2 = transform_core->sy2;
x3 = transform_core->sx3; y3 = transform_core->sy3;
x4 = transform_core->sx4; y4 = transform_core->sy4;
/* find the handles' width and height */
srw = 10;
srh = 10;
/* draw the bounding box */
gdk_draw_line (transform_core->core->win, transform_core->core->gc,
x1, y1, x2, y2);
gdk_draw_line (transform_core->core->win, transform_core->core->gc,
x2, y2, x4, y4);
gdk_draw_line (transform_core->core->win, transform_core->core->gc,
x3, y3, x4, y4);
gdk_draw_line (transform_core->core->win, transform_core->core->gc,
x3, y3, x1, y1);
/* Draw the grid */
if ((transform_core->grid_coords != NULL) &&
(transform_core->tgrid_coords != NULL) &&
((tool->type != PERSPECTIVE) ||
((transform_core->transform[0][0] >=0.0) &&
(transform_core->transform[1][1] >=0.0))))
{
gci = 0;
k = transform_core->ngx + transform_core->ngy;
for (i = 0; i < k; i++)
{
gdisplay_transform_coords (gdisp, transform_core->tgrid_coords[gci],
transform_core->tgrid_coords[gci+1],
&xa, &ya, 0);
gdisplay_transform_coords (gdisp, transform_core->tgrid_coords[gci+2],
transform_core->tgrid_coords[gci+3],
&xb, &yb, 0);
gdk_draw_line (transform_core->core->win, transform_core->core->gc,
xa, ya, xb, yb);
gci += 4;
}
}
/* draw the tool handles */
gdk_draw_rectangle (transform_core->core->win, transform_core->core->gc, 0,
x1 - (srw >> 1), y1 - (srh >> 1), srw, srh);
gdk_draw_rectangle (transform_core->core->win, transform_core->core->gc, 0,
x2 - (srw >> 1), y2 - (srh >> 1), srw, srh);
gdk_draw_rectangle (transform_core->core->win, transform_core->core->gc, 0,
x3 - (srw >> 1), y3 - (srh >> 1), srw, srh);
gdk_draw_rectangle (transform_core->core->win, transform_core->core->gc, 0,
x4 - (srw >> 1), y4 - (srh >> 1), srw, srh);
/* draw the center */
if (tool->type == ROTATE)
{
gdisplay_transform_coords (gdisp, transform_core->tcx, transform_core->tcy,
&transform_core->scx, &transform_core->scy, 0);
gdk_draw_arc (transform_core->core->win, transform_core->core->gc, 1,
transform_core->scx - (srw >> 1),
transform_core->scy - (srh >> 1),
srw, srh, 0, 23040);
}
if(transform_tool_showpath())
{
GimpMatrix tmp_matrix;
if (transform_tool_direction () == TRANSFORM_CORRECTIVE)
{
gimp_matrix_invert (transform_core->transform,tmp_matrix);
}
else
{
gimp_matrix_duplicate(transform_core->transform,tmp_matrix);
}
paths_draw_current(gdisp,transform_core->core,tmp_matrix);
}
}
Tool *
transform_core_new (ToolType type,
int interactive)
{
Tool * tool;
TransformCore * private;
int i;
tool = tools_new_tool (type);
private = g_new (TransformCore, 1);
private->interactive = interactive;
if (interactive)
private->core = draw_core_new (transform_core_draw);
else
private->core = draw_core_new (transform_core_no_draw);
private->function = CREATING;
private->original = NULL;
private->bpressed = FALSE;
for (i = 0; i < TRAN_INFO_SIZE; i++)
private->trans_info[i] = 0;
private->grid_coords = private->tgrid_coords = NULL;
tool->scroll_lock = TRUE; /* Disallow scrolling */
tool->preserve = FALSE; /* Don't preserve on drawable change */
tool->private = (void *) private;
tool->button_press_func = transform_core_button_press;
tool->button_release_func = transform_core_button_release;
tool->motion_func = transform_core_motion;
tool->cursor_update_func = transform_core_cursor_update;
tool->control_func = transform_core_control;
return tool;
}
void
transform_core_free (Tool *tool)
{
TransformCore * transform_core;
transform_core = (TransformCore *) tool->private;
/* Make sure the selection core is not visible */
if (tool->state == ACTIVE)
draw_core_stop (transform_core->core, tool);
/* Free the selection core */
draw_core_free (transform_core->core);
/* Free up the original selection if it exists */
if (transform_core->original)
tile_manager_destroy (transform_core->original);
/* If there is an information dialog, free it up */
if (transform_info)
info_dialog_free (transform_info);
transform_info = NULL;
transform_info_inited = FALSE;
/* Free the grid line endpoint arrays if they exist */
if (transform_core->grid_coords != NULL)
g_free (transform_core->grid_coords);
if (transform_core->tgrid_coords != NULL)
g_free (transform_core->tgrid_coords);
/* Finally, free the transform tool itself */
g_free (transform_core);
}
void
transform_bounding_box (Tool *tool)
{
TransformCore * transform_core;
int i, k;
int gci;
GDisplay * gdisp;
transform_core = (TransformCore *) tool->private;
gimp_matrix_transform_point (transform_core->transform,
transform_core->x1, transform_core->y1,
&transform_core->tx1, &transform_core->ty1);
gimp_matrix_transform_point (transform_core->transform,
transform_core->x2, transform_core->y1,
&transform_core->tx2, &transform_core->ty2);
gimp_matrix_transform_point (transform_core->transform,
transform_core->x1, transform_core->y2,
&transform_core->tx3, &transform_core->ty3);
gimp_matrix_transform_point (transform_core->transform,
transform_core->x2, transform_core->y2,
&transform_core->tx4, &transform_core->ty4);
if (tool->type == ROTATE)
gimp_matrix_transform_point (transform_core->transform,
transform_core->cx, transform_core->cy,
&transform_core->tcx, &transform_core->tcy);
if (transform_core->grid_coords != NULL &&
transform_core->tgrid_coords != NULL)
{
gci = 0;
k = (transform_core->ngx + transform_core->ngy) * 2;
for (i = 0; i < k; i++)
{
gimp_matrix_transform_point (transform_core->transform,
transform_core->grid_coords[gci],
transform_core->grid_coords[gci+1],
&(transform_core->tgrid_coords[gci]),
&(transform_core->tgrid_coords[gci+1]));
gci += 2;
}
}
gdisp = (GDisplay *) tool->gdisp_ptr;
}
void
transform_core_reset (Tool *tool,
void *gdisp_ptr)
{
TransformCore * transform_core;
GDisplay * gdisp;
transform_core = (TransformCore *) tool->private;
gdisp = (GDisplay *) gdisp_ptr;
if (transform_core->original)
tile_manager_destroy (transform_core->original);
transform_core->original = NULL;
/* inactivate the tool */
transform_core->function = CREATING;
draw_core_stop (transform_core->core, tool);
info_dialog_popdown (transform_info);
tool->state = INACTIVE;
tool->gdisp_ptr = NULL;
tool->drawable = NULL;
}
static int
transform_core_bounds (Tool *tool,
void *gdisp_ptr)
{
GDisplay * gdisp;
TransformCore * transform_core;
TileManager * tiles;
GimpDrawable *drawable;
int offset_x, offset_y;
gdisp = (GDisplay *) gdisp_ptr;
transform_core = (TransformCore *) tool->private;
tiles = transform_core->original;
drawable = gimage_active_drawable (gdisp->gimage);
/* find the boundaries */
if (tiles)
{
transform_core->x1 = tiles->x;
transform_core->y1 = tiles->y;
transform_core->x2 = tiles->x + tiles->width;
transform_core->y2 = tiles->y + tiles->height;
}
else
{
drawable_offsets (drawable, &offset_x, &offset_y);
drawable_mask_bounds (drawable,
&transform_core->x1, &transform_core->y1,
&transform_core->x2, &transform_core->y2);
transform_core->x1 += offset_x;
transform_core->y1 += offset_y;
transform_core->x2 += offset_x;
transform_core->y2 += offset_y;
}
transform_core->cx = (transform_core->x1 + transform_core->x2) / 2;
transform_core->cy = (transform_core->y1 + transform_core->y2) / 2;
/* changing the bounds invalidates any grid we may have */
transform_core_grid_recalc (transform_core);
return TRUE;
}
void
transform_core_grid_density_changed ()
{
TransformCore * transform_core;
transform_core = (TransformCore *) active_tool->private;
if (transform_core->function == CREATING)
return;
draw_core_pause (transform_core->core, active_tool);
transform_core_grid_recalc (transform_core);
transform_bounding_box (active_tool);
draw_core_resume (transform_core->core, active_tool);
}
void
transform_core_showpath_changed (gint type)
{
TransformCore * transform_core;
transform_core = (TransformCore *) active_tool->private;
if (transform_core->function == CREATING)
return;
if (type)
draw_core_pause (transform_core->core, active_tool);
else
draw_core_resume (transform_core->core, active_tool);
}
static void
transform_core_grid_recalc (TransformCore *transform_core)
{
if (transform_core->grid_coords != NULL)
{
g_free (transform_core->grid_coords);
transform_core->grid_coords = NULL;
}
if (transform_core->tgrid_coords != NULL)
{
g_free (transform_core->tgrid_coords);
transform_core->tgrid_coords = NULL;
}
if (transform_tool_show_grid())
transform_core_setup_grid (active_tool);
}
static void
transform_core_setup_grid (Tool *tool)
{
TransformCore * transform_core;
int i, gci;
double *coords;
transform_core = (TransformCore *) tool->private;
/* We use the transform_tool_grid_size function only here, even
* if the user changes the grid size in the middle of an
* operation, nothing happens.
*/
transform_core->ngx =
(transform_core->x2 - transform_core->x1) / transform_tool_grid_size ();
if (transform_core->ngx > 0)
transform_core->ngx--;
transform_core->ngy =
(transform_core->y2 - transform_core->y1) / transform_tool_grid_size ();
if (transform_core->ngy > 0)
transform_core->ngy--;
transform_core->grid_coords = coords = (double *)
g_malloc ((transform_core->ngx + transform_core->ngy) * 4
* sizeof(double));
transform_core->tgrid_coords = (double *)
g_malloc ((transform_core->ngx + transform_core->ngy) * 4
* sizeof(double));
gci = 0;
for (i = 1; i <= transform_core->ngx; i++)
{
coords[gci] = transform_core->x1 +
((double) i)/(transform_core->ngx + 1) *
(transform_core->x2 - transform_core->x1);
coords[gci+1] = transform_core->y1;
coords[gci+2] = coords[gci];
coords[gci+3] = transform_core->y2;
gci += 4;
}
for (i = 1; i <= transform_core->ngy; i++)
{
coords[gci] = transform_core->x1;
coords[gci+1] = transform_core->y1 +
((double) i)/(transform_core->ngy + 1) *
(transform_core->y2 - transform_core->y1);
coords[gci+2] = transform_core->x2;
coords[gci+3] = coords[gci+1];
gci += 4;
}
}
static void *
transform_core_recalc (Tool *tool,
void *gdisp_ptr)
{
TransformCore * transform_core;
transform_core = (TransformCore *) tool->private;
transform_core_bounds (tool, gdisp_ptr);
return (* transform_core->trans_func) (tool, gdisp_ptr, RECALC);
}
/* Actually carry out a transformation */
TileManager *
transform_core_do (GImage *gimage,
GimpDrawable *drawable,
TileManager *float_tiles,
int interpolation,
GimpMatrix matrix,
progress_func_t progress_callback,
gpointer progress_data)
{
PixelRegion destPR;
TileManager *tiles;
GimpMatrix m;
GimpMatrix im;
int itx, ity;
int tx1, ty1, tx2, ty2;
int width, height;
int alpha;
int bytes, b;
int x, y;
int sx, sy;
int x1, y1, x2, y2;
double xinc, yinc, winc;
double tx, ty, tw;
double ttx = 0.0, tty = 0.0;
unsigned char * dest, * d;
unsigned char * src[16];
Tile *tile[16];
unsigned char bg_col[MAX_CHANNELS];
int i;
double a_val, a_recip;
int newval;
PixelSurround surround;
alpha = 0;
/* turn interpolation off for simple transformations (e.g. rot90) */
if (gimp_matrix_is_simple (matrix)
|| interpolation_type == NEAREST_NEIGHBOR_INTERPOLATION)
interpolation = FALSE;
/* Get the background color */
gimage_get_background (gimage, drawable, bg_col);
switch (drawable_type (drawable))
{
case RGB_GIMAGE: case RGBA_GIMAGE:
bg_col[ALPHA_PIX] = TRANSPARENT_OPACITY;
alpha = 3;
break;
case GRAY_GIMAGE: case GRAYA_GIMAGE:
bg_col[ALPHA_G_PIX] = TRANSPARENT_OPACITY;
alpha = 1;
break;
case INDEXED_GIMAGE: case INDEXEDA_GIMAGE:
bg_col[ALPHA_I_PIX] = TRANSPARENT_OPACITY;
alpha = 1;
/* If the gimage is indexed color, ignore smoothing value */
interpolation = 0;
break;
}
if (transform_tool_direction () == TRANSFORM_CORRECTIVE)
{
/* keep the original matrix here, so we dont need to recalculate
the inverse later */
gimp_matrix_duplicate (matrix, m);
gimp_matrix_invert (matrix, im);
matrix = im;
}
else
{
/* Find the inverse of the transformation matrix */
gimp_matrix_invert (matrix, m);
}
paths_transform_current_path(gimage,matrix,FALSE);
x1 = float_tiles->x;
y1 = float_tiles->y;
x2 = x1 + float_tiles->width;
y2 = y1 + float_tiles->height;
/* Find the bounding coordinates */
if (active_tool && transform_tool_clip ())
{
tx1 = x1;
ty1 = y1;
tx2 = x2;
ty2 = y2;
}
else
{
double dx1, dy1, dx2, dy2, dx3, dy3, dx4, dy4;
gimp_matrix_transform_point (matrix, x1, y1, &dx1, &dy1);
gimp_matrix_transform_point (matrix, x2, y1, &dx2, &dy2);
gimp_matrix_transform_point (matrix, x1, y2, &dx3, &dy3);
gimp_matrix_transform_point (matrix, x2, y2, &dx4, &dy4);
tx1 = MINIMUM (dx1, dx2);
tx1 = MINIMUM (tx1, dx3);
tx1 = MINIMUM (tx1, dx4);
ty1 = MINIMUM (dy1, dy2);
ty1 = MINIMUM (ty1, dy3);
ty1 = MINIMUM (ty1, dy4);
tx2 = MAXIMUM (dx1, dx2);
tx2 = MAXIMUM (tx2, dx3);
tx2 = MAXIMUM (tx2, dx4);
ty2 = MAXIMUM (dy1, dy2);
ty2 = MAXIMUM (ty2, dy3);
ty2 = MAXIMUM (ty2, dy4);
}
/* Get the new temporary buffer for the transformed result */
tiles = tile_manager_new ((tx2 - tx1), (ty2 - ty1), float_tiles->bpp);
pixel_region_init (&destPR, tiles, 0, 0, (tx2 - tx1), (ty2 - ty1), TRUE);
tiles->x = tx1;
tiles->y = ty1;
/* initialise the pixel_surround accessor */
if (interpolation) {
if (interpolation_type == CUBIC_INTERPOLATION) {
pixel_surround_init(&surround, float_tiles, 4, 4, bg_col);
} else {
pixel_surround_init(&surround, float_tiles, 2, 2, bg_col);
}
} else {
/* not actually useful, keeps the code cleaner */
pixel_surround_init(&surround, float_tiles, 1, 1, bg_col);
}
width = tiles->width;
height = tiles->height;
bytes = tiles->bpp;
dest = (unsigned char *) g_malloc (width * bytes);
xinc = m[0][0];
yinc = m[1][0];
winc = m[2][0];
/* these loops could be rearranged, depending on which bit of code
* you'd most like to write more than once.
*/
for (y = ty1; y < ty2; y++)
{
if (progress_callback && !(y & 0xf))
(*progress_callback)(ty1, ty2, y, progress_data);
/* set up inverse transform steps */
tx = xinc * tx1 + m[0][1] * y + m[0][2];
ty = yinc * tx1 + m[1][1] * y + m[1][2];
tw = winc * tx1 + m[2][1] * y + m[2][2];
d = dest;
for (x = tx1; x < tx2; x++)
{
/* normalize homogeneous coords */
if (tw == 0.0)
g_message (_("homogeneous coordinate = 0...\n"));
else if (tw != 1.0)
{
ttx = tx / tw;
tty = ty / tw;
}
else
{
ttx = tx;
tty = ty;
}
/* Set the destination pixels */
if (interpolation)
{
if (interpolation_type == CUBIC_INTERPOLATION)
{
/* ttx & tty are the subpixel coordinates of the point in the original
* selection's floating buffer. We need the four integer pixel coords
* around them: itx to itx + 3, ity to ity + 3
*/
itx = floor(ttx);
ity = floor(tty);
/* check if any part of our region overlaps the buffer */
if ((itx + 2) >= x1 && (itx - 1) < x2 &&
(ity + 2) >= y1 && (ity - 1) < y2 )
{
unsigned char* data;
int row;
double dx, dy;
unsigned char* start;
/* lock the pixel surround */
data = pixel_surround_lock(&surround, itx - 1 - x1, ity - 1 - y1);
row = pixel_surround_rowstride(&surround);
/* the fractional error */
dx = ttx - itx;
dy = tty - ity;
/* calculate alpha of result */
start = &data[alpha];
a_val = cubic (dy,
CUBIC_ROW (dx, start, bytes),
CUBIC_ROW (dx, start + row, bytes),
CUBIC_ROW (dx, start + row + row, bytes),
CUBIC_ROW (dx, start + row + row + row, bytes));
if (a_val <= 0.0)
{
a_recip = 0.0;
d[alpha] = 0;
}
else if (a_val > 255.0)
{
a_recip = 1.0 / a_val;
d[alpha] = 255;
}
else
{
a_recip = 1.0 / a_val;
d[alpha] = RINT(a_val);
}
/* for colour channels c,
* result = bicubic(c * alpha) / bicubic(alpha)
*/
for (i = -alpha; i < 0; ++i) {
start = &data[alpha];
newval = RINT(a_recip * cubic (dy,
CUBIC_SCALED_ROW (dx, start, bytes, i),
CUBIC_SCALED_ROW (dx, start + row, bytes, i),
CUBIC_SCALED_ROW (dx, start + row + row, bytes, i),
CUBIC_SCALED_ROW (dx, start + row + row + row, bytes, i)));
if (newval <= 0) {
*d++ = 0;
} else if (newval > 255) {
*d++ = 255;
} else {
*d++ = newval;
}
}
d++;
pixel_surround_release(&surround);
}
else /* not in source range */
{
/* increment the destination pointers */
for (b = 0; b < bytes; b++)
*d++ = bg_col[b];
}
}
else /* linear */
{
itx = floor(ttx);
ity = floor(tty);
/* expand source area to cover interpolation region */
/* (which runs from itx to itx + 1, same in y) */
if ((itx + 1) >= x1 && itx < x2 &&
(ity + 1) >= y1 && ity < y2 )
{
unsigned char* data;
int row;
double dx, dy;
unsigned char* chan;
/* lock the pixel surround */
data = pixel_surround_lock(&surround, itx - x1, ity - y1);
row = pixel_surround_rowstride(&surround);
/* the fractional error */
dx = ttx - itx;
dy = tty - ity;
/* calculate alpha value of result pixel */
chan = &data[alpha];
a_val = BILINEAR (chan[0], chan[bytes], chan[row], chan[row+bytes], dx, dy);
if (a_val <= 0.0) {
a_recip = 0.0;
d[alpha] = 0.0;
} else if (a_val >= 255.0) {
a_recip = 1.0 / a_val;
d[alpha] = 255;
} else {
a_recip = 1.0 / a_val;
d[alpha] = RINT(a_val);
}
/* for colour channels c,
* result = bilinear(c * alpha) / bilinear(alpha)
*/
for (i = -alpha; i < 0; ++i) {
chan = &data[alpha];
newval = RINT(a_recip *
BILINEAR (chan[0] * chan[i],
chan[bytes] * chan[bytes+i],
chan[row] * chan[row+i],
chan[row+bytes] * chan[row+bytes+i], dx, dy));
if (newval <= 0) {
*d++ = 0;
} else if (newval > 255) {
*d++ = 255;
} else {
*d++ = newval;
}
}
/* already set alpha */
d++;
pixel_surround_release(&surround);
}
else /* not in source range */
{
/* increment the destination pointers */
for (b = 0; b < bytes; b++)
*d++ = bg_col[b];
}
}
}
else /* no interpolation */
{
itx = RINT(ttx);
ity = RINT(tty);
if (itx >= x1 && itx < x2 &&
ity >= y1 && ity < y2 )
{
/* x, y coordinates into source tiles */
sx = itx - x1;
sy = ity - y1;
REF_TILE (0, sx, sy);
for (b = 0; b < bytes; b++)
*d++ = src[0][b];
tile_release (tile[0], FALSE);
}
else /* not in source range */
{
/* increment the destination pointers */
for (b = 0; b < bytes; b++)
*d++ = bg_col[b];
}
}
/* increment the transformed coordinates */
tx += xinc;
ty += yinc;
tw += winc;
}
/* set the pixel region row */
pixel_region_set_row (&destPR, 0, (y - ty1), width, dest);
}
pixel_surround_clear(&surround);
g_free (dest);
return tiles;
}
TileManager *
transform_core_cut (GImage *gimage,
GimpDrawable *drawable,
int *new_layer)
{
TileManager *tiles;
/* extract the selected mask if there is a selection */
if (! gimage_mask_is_empty (gimage))
{
tiles = gimage_mask_extract (gimage, drawable, TRUE, TRUE);
*new_layer = TRUE;
}
/* otherwise, just copy the layer */
else
{
tiles = gimage_mask_extract (gimage, drawable, FALSE, TRUE);
*new_layer = FALSE;
}
return tiles;
}
/* Paste a transform to the gdisplay */
Layer *
transform_core_paste (GImage *gimage,
GimpDrawable *drawable,
TileManager *tiles,
int new_layer)
{
Layer * layer;
Layer * floating_layer;
if (new_layer)
{
layer = layer_from_tiles (gimage, drawable, tiles, _("Transformation"),
OPAQUE_OPACITY, NORMAL_MODE);
GIMP_DRAWABLE(layer)->offset_x = tiles->x;
GIMP_DRAWABLE(layer)->offset_y = tiles->y;
/* Start a group undo */
undo_push_group_start (gimage, EDIT_PASTE_UNDO);
floating_sel_attach (layer, drawable);
/* End the group undo */
undo_push_group_end (gimage);
/* Free the tiles */
tile_manager_destroy (tiles);
return layer;
}
else
{
if (GIMP_IS_LAYER(drawable))
layer=GIMP_LAYER(drawable);
else
return NULL;
layer_add_alpha (layer);
floating_layer = gimage_floating_sel (gimage);
if (floating_layer)
floating_sel_relax (floating_layer, TRUE);
gdisplays_update_area (gimage,
GIMP_DRAWABLE(layer)->offset_x, GIMP_DRAWABLE(layer)->offset_y,
GIMP_DRAWABLE(layer)->width, GIMP_DRAWABLE(layer)->height);
/* Push an undo */
undo_push_layer_mod (gimage, layer);
/* set the current layer's data */
GIMP_DRAWABLE(layer)->tiles = tiles;
/* Fill in the new layer's attributes */
GIMP_DRAWABLE(layer)->width = tiles->width;
GIMP_DRAWABLE(layer)->height = tiles->height;
GIMP_DRAWABLE(layer)->bytes = tiles->bpp;
GIMP_DRAWABLE(layer)->offset_x = tiles->x;
GIMP_DRAWABLE(layer)->offset_y = tiles->y;
if (floating_layer)
floating_sel_rigor (floating_layer, TRUE);
drawable_update (GIMP_DRAWABLE(layer), 0, 0, GIMP_DRAWABLE(layer)->width, GIMP_DRAWABLE(layer)->height);
/* if we were operating on the floating selection, then it's boundary
* and previews need invalidating */
if (layer == floating_layer)
floating_sel_invalidate (floating_layer);
return layer;
}
}
/* Note: cubic function no longer clips result */
static double
cubic (double dx,
int jm1,
int j,
int jp1,
int jp2)
{
double result;
#if 0
/* Equivalent to Gimp 1.1.1 and earlier - some ringing */
result = ((( ( - jm1 + j - jp1 + jp2 ) * dx +
( jm1 + jm1 - j - j + jp1 - jp2 ) ) * dx +
( - jm1 + jp1 ) ) * dx + j );
/* Recommended by Mitchell and Netravali - too blurred? */
result = ((( ( - 7 * jm1 + 21 * j - 21 * jp1 + 7 * jp2 ) * dx +
( 15 * jm1 - 36 * j + 27 * jp1 - 6 * jp2 ) ) * dx +
( - 9 * jm1 + 9 * jp1 ) ) * dx + (jm1 + 16 * j + jp1) ) / 18.0;
#else
/* Catmull-Rom - not bad */
result = ((( ( - jm1 + 3 * j - 3 * jp1 + jp2 ) * dx +
( 2 * jm1 - 5 * j + 4 * jp1 - jp2 ) ) * dx +
( - jm1 + jp1 ) ) * dx + (j + j) ) / 2.0;
#endif
return result;
}
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