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gimp/plug-ins/common/rotators.c

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/*
* Rotate plug-in version 1.00 - 97.09.28
* by Adam D. Moss <adam@gimp.org>
*
* This plugin will rotate a single layer or a whole image
* by 90 degrees clockwise or anticlockwise. (So I guess it's
* actually four plugins in one. Bonus!)
*
* This is part of the GIMP package and falls under the GPL.
*/
/*
* TODO:
*
* Work somewhat better with channels & masks
* Test PDB interface
* Progress bar
*
* Do something magical so that only one rotate can be occuring
* at a time!
*/
#include <stdlib.h>
#include <stdio.h>
#include "libgimp/gimp.h"
/* Declare local functions. */
static void query(void);
static void run(char *name,
int nparams,
GParam * param,
int *nreturn_vals,
GParam ** return_vals);
static void do_layerrot(GDrawable*, gint32, gboolean, gboolean);
GPlugInInfo PLUG_IN_INFO =
{
NULL, /* init_proc */
NULL, /* quit_proc */
query, /* query_proc */
run, /* run_proc */
};
MAIN()
static void query()
{
static GParamDef args[] =
{
{PARAM_INT32, "run_mode", "Interactive, non-interactive"},
{PARAM_IMAGE, "image", "Input image"},
{PARAM_DRAWABLE, "drawable", "Input drawable"},
};
static GParamDef *return_vals = NULL;
static int nargs = sizeof(args) / sizeof(args[0]);
static int nreturn_vals = 0;
gimp_install_procedure("plug_in_layer_rot90",
"Rotates the given layer 90 degrees clockwise.",
"",
"Adam D. Moss (adam@gimp.org)",
"Adam D. Moss (adam@gimp.org)",
"1997",
"<Image>/Image/Transforms/Layer/Rotate 90",
"RGB*, GRAY*, INDEXED*",
PROC_PLUG_IN,
nargs, nreturn_vals,
args, return_vals);
gimp_install_procedure("plug_in_layer_rot270",
"Rotates the given layer 90 degrees anticlockwise.",
"",
"Adam D. Moss (adam@gimp.org)",
"Adam D. Moss (adam@gimp.org)",
"1997",
"<Image>/Image/Transforms/Layer/Rotate 270",
"RGB*, GRAY*, INDEXED*",
PROC_PLUG_IN,
nargs, nreturn_vals,
args, return_vals);
gimp_install_procedure("plug_in_image_rot90",
"Rotates the given image 90 degrees clockwise.",
"",
"Adam D. Moss (adam@gimp.org)",
"Adam D. Moss (adam@gimp.org)",
"1997",
"<Image>/Image/Transforms/Image/Rotate 90",
"RGB*, GRAY*, INDEXED*",
PROC_PLUG_IN,
nargs, nreturn_vals,
args, return_vals);
gimp_install_procedure("plug_in_image_rot270",
"Rotates the current image 90 degrees anticlockwise.",
"",
"Adam D. Moss (adam@gimp.org)",
"Adam D. Moss (adam@gimp.org)",
"1997",
"<Image>/Image/Transforms/Image/Rotate 270",
"RGB*, GRAY*, INDEXED*",
PROC_PLUG_IN,
nargs, nreturn_vals,
args, return_vals);
}
static void run(char *name, int n_params, GParam * param, int *nreturn_vals,
GParam ** return_vals)
{
static GParam values[1];
GDrawable *drawable;
GRunModeType run_mode;
GStatusType status = STATUS_SUCCESS;
gint32 image_id;
gboolean clockwise;
gboolean alllayers;
gint32 *layers;
int nlayers,i;
int proc_returnvals;
/* Check the procedure name we were called with, to decide
what needs to be done. */
if (
(strcmp(name,"plug_in_layer_rot90")==0)
||
(strcmp(name,"plug_in_image_rot90")==0)
)
clockwise = TRUE;
else
clockwise = FALSE;
if (
(strcmp(name,"plug_in_image_rot270")==0)
||
(strcmp(name,"plug_in_image_rot90")==0)
)
alllayers = TRUE;
else
alllayers = FALSE;
*nreturn_vals = 1;
*return_vals = values;
run_mode = param[0].data.d_int32;
if (run_mode == RUN_NONINTERACTIVE) {
if (n_params != 3) {
status = STATUS_CALLING_ERROR;
}
}
if (status == STATUS_SUCCESS) {
/* Get the specified drawable */
drawable = gimp_drawable_get(param[2].data.d_drawable);
image_id = param[1].data.d_image;
/* Make sure that the drawable is gray or RGB or indexed */
if (gimp_drawable_color(drawable->id) || gimp_drawable_gray(drawable->id) || gimp_drawable_indexed(drawable->id)) {
gimp_tile_cache_ntiles(7 + 2*(
drawable->width > drawable->height ?
( drawable->width / gimp_tile_width() ) :
( drawable->height / gimp_tile_height() )
)
);
/******************* DO THE WORK **************/
gimp_run_procedure ("gimp_undo_push_group_start", &proc_returnvals,
PARAM_IMAGE, image_id,
PARAM_END);
if (alllayers) /* rotate whole image, including all layers */
{
gimp_drawable_detach(drawable);
/* get a list of layers for this image_id */
layers = gimp_image_get_layers (image_id, &nlayers);
for (i=0;i<nlayers;i++)
{
drawable = gimp_drawable_get (layers[i]);
do_layerrot(drawable, image_id, clockwise, alllayers);
gimp_drawable_detach(drawable);
}
g_free(layers);
gimp_image_resize(image_id,
gimp_image_height(image_id),
gimp_image_width(image_id),
0, 0);
}
else /* just rotate a single layer */
{
do_layerrot(drawable, image_id, clockwise, alllayers);
gimp_drawable_detach(drawable);
}
gimp_run_procedure ("gimp_undo_push_group_end", &proc_returnvals,
PARAM_IMAGE, image_id,
PARAM_END);
/******************* WORK FINISHED **************/
if (run_mode != RUN_NONINTERACTIVE)
gimp_displays_flush();
} else {
status = STATUS_EXECUTION_ERROR;
}
}
values[0].type = PARAM_STATUS;
values[0].data.d_status = status;
}
static void do_layerrot(GDrawable *drawable,
gint32 image_id,
gboolean clockwise,
gboolean alllayers)
{
GPixelRgn rowPR, colPR;
gint width, height, x, y;
guchar *buffer;
gboolean x_is_longer;
gint xoff,yoff, newxoff,newyoff;
gint was_preserve_transparency = FALSE;
gint bytes;
width = drawable->width;
height = drawable->height;
bytes = drawable->bpp;
x_is_longer = (width > height);
if (gimp_drawable_layer(drawable->id))
{
gimp_layer_resize(drawable->id,
x_is_longer? width : height,
x_is_longer? width : height,
0, 0);
gimp_drawable_flush (drawable);
drawable = gimp_drawable_get(drawable->id);
}
else /* not a layer... probably a channel... abort operation */
exit;
/* If 'preserve transparency' was on, we need to temporatily
turn it off while rotating... */
if (gimp_layer_get_preserve_transparency(drawable->id))
{
was_preserve_transparency = TRUE;
gimp_layer_set_preserve_transparency(drawable->id,
FALSE);
}
buffer = g_malloc ((x_is_longer? width: height) * bytes);
/* initialize the pixel regions */
gimp_pixel_rgn_init(&rowPR, drawable, 0, 0,
x_is_longer? width:height,
x_is_longer? width:height,
FALSE, FALSE);
gimp_pixel_rgn_init(&colPR, drawable, 0, 0,
x_is_longer? width:height,
x_is_longer? width:height,
TRUE, TRUE);
if (clockwise)
{
/* CLOCKWISE */
for (y=0; y<height; y++)
{
x=(height-y)-1;
gimp_pixel_rgn_get_row(&rowPR, buffer, 0, y, width);
gimp_pixel_rgn_set_col(&colPR, buffer, x, 0, width);
}
}
else
{
/* ANTICLOCKWISE */
for (x=0; x<width; x++)
{
y=(width-x)-1;
gimp_pixel_rgn_get_col(&rowPR, buffer, x, 0, height);
gimp_pixel_rgn_set_row(&colPR, buffer, 0, y, height);
}
}
g_free(buffer);
gimp_drawable_flush (drawable);
gimp_drawable_merge_shadow (drawable->id, TRUE);
gimp_drawable_update (drawable->id, 0, 0, height, width);
gimp_layer_resize(drawable->id,
height,
width,
0, 0);
drawable = gimp_drawable_get(drawable->id);
gimp_drawable_flush (drawable);
gimp_drawable_update (drawable->id, 0, 0, height, width);
if (!alllayers)
{
/* Offset the layer so that it remains centered on the same spot */
gimp_drawable_offsets (drawable->id,
&xoff,
&yoff);
newxoff = xoff+(width-height)/2;
newyoff = yoff+(height-width)/2;
gimp_layer_set_offsets(drawable->id,
newxoff,
newyoff);
}
else /* alllayers */
{
/* Iterating through all layers... so rotate around the image
centre, not the layer centre. */
gimp_drawable_offsets (drawable->id,
&xoff,
&yoff);
if (clockwise)
{
newyoff = xoff;
newxoff = gimp_image_height(image_id)-yoff-height;
}
else /* anticlockwise */
{
newxoff = yoff;
newyoff = gimp_image_width(image_id)-xoff-width;
}
gimp_layer_set_offsets(drawable->id,
newxoff,
newyoff);
}
/* set 'preserve transparency' if it was set when we started... */
if (was_preserve_transparency)
{
gimp_layer_set_preserve_transparency(drawable->id,
TRUE);
}
}
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