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gimp/app/core/gimpdrawable-transform.c

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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995-2003 Spencer Kimball, Peter Mattis, and others
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <stdlib.h>
#include <string.h>
#include <cairo.h>
#include <gegl.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include "libgimpbase/gimpbase.h"
#include "libgimpcolor/gimpcolor.h"
#include "libgimpmath/gimpmath.h"
#include "core-types.h"
#include "gegl/gimp-gegl-apply-operation.h"
#include "gegl/gimp-gegl-utils.h"
#include "gimp.h"
#include "gimp-transform-resize.h"
#include "gimpchannel.h"
#include "gimpcontext.h"
#include "gimpdrawable-transform.h"
#include "gimpimage.h"
#include "gimpimage-undo.h"
#include "gimpimage-undo-push.h"
#include "gimplayer.h"
#include "gimplayer-floating-selection.h"
#include "gimplayer-new.h"
#include "gimppickable.h"
#include "gimpprogress.h"
#include "gimpselection.h"
#include "gimp-intl.h"
#if defined (HAVE_FINITE)
#define FINITE(x) finite(x)
#elif defined (HAVE_ISFINITE)
#define FINITE(x) isfinite(x)
#elif defined (G_OS_WIN32)
#define FINITE(x) _finite(x)
#else
#error "no FINITE() implementation available?!"
#endif
/* public functions */
GeglBuffer *
gimp_drawable_transform_buffer_affine (GimpDrawable *drawable,
GimpContext *context,
GeglBuffer *orig_buffer,
gint orig_offset_x,
gint orig_offset_y,
const GimpMatrix3 *matrix,
GimpTransformDirection direction,
GimpInterpolationType interpolation_type,
GimpTransformResize clip_result,
GimpColorProfile **buffer_profile,
gint *new_offset_x,
gint *new_offset_y,
GimpProgress *progress)
{
GeglBuffer *new_buffer;
GimpMatrix3 m;
gint u1, v1, u2, v2; /* source bounding box */
gint x1, y1, x2, y2; /* target bounding box */
GimpMatrix3 gegl_matrix;
g_return_val_if_fail (GIMP_IS_DRAWABLE (drawable), NULL);
g_return_val_if_fail (gimp_item_is_attached (GIMP_ITEM (drawable)), NULL);
g_return_val_if_fail (GIMP_IS_CONTEXT (context), NULL);
g_return_val_if_fail (GEGL_IS_BUFFER (orig_buffer), NULL);
g_return_val_if_fail (matrix != NULL, NULL);
g_return_val_if_fail (buffer_profile != NULL, NULL);
g_return_val_if_fail (new_offset_x != NULL, NULL);
g_return_val_if_fail (new_offset_y != NULL, NULL);
g_return_val_if_fail (progress == NULL || GIMP_IS_PROGRESS (progress), NULL);
*buffer_profile =
gimp_color_managed_get_color_profile (GIMP_COLOR_MANAGED (drawable));
m = *matrix;
if (direction == GIMP_TRANSFORM_BACKWARD)
{
/* Find the inverse of the transformation matrix */
gimp_matrix3_invert (&m);
}
u1 = orig_offset_x;
v1 = orig_offset_y;
u2 = u1 + gegl_buffer_get_width (orig_buffer);
v2 = v1 + gegl_buffer_get_height (orig_buffer);
/* Always clip unfloated buffers since they must keep their size */
if (G_TYPE_FROM_INSTANCE (drawable) == GIMP_TYPE_CHANNEL &&
! babl_format_has_alpha (gegl_buffer_get_format (orig_buffer)))
clip_result = GIMP_TRANSFORM_RESIZE_CLIP;
if (gimp_matrix3_will_explode (&m, u1, v1, u2, v2))
clip_result = GIMP_TRANSFORM_RESIZE_CLIP;
/* Find the bounding coordinates of target */
gimp_transform_resize_boundary (&m, clip_result,
u1, v1, u2, v2,
&x1, &y1, &x2, &y2);
/* Get the new temporary buffer for the transformed result */
new_buffer = gegl_buffer_new (GEGL_RECTANGLE (0, 0, x2 - x1, y2 - y1),
gegl_buffer_get_format (orig_buffer));
gimp_matrix3_identity (&gegl_matrix);
gimp_matrix3_translate (&gegl_matrix, u1, v1);
gimp_matrix3_mult (&m, &gegl_matrix);
gimp_matrix3_translate (&gegl_matrix, -x1, -y1);
gimp_gegl_apply_transform (orig_buffer, progress, NULL,
new_buffer,
interpolation_type,
clip_result,
&gegl_matrix);
*new_offset_x = x1;
*new_offset_y = y1;
return new_buffer;
}
GeglBuffer *
gimp_drawable_transform_buffer_flip (GimpDrawable *drawable,
GimpContext *context,
GeglBuffer *orig_buffer,
gint orig_offset_x,
gint orig_offset_y,
GimpOrientationType flip_type,
gdouble axis,
gboolean clip_result,
GimpColorProfile **buffer_profile,
gint *new_offset_x,
gint *new_offset_y)
{
const Babl *format;
GeglBuffer *new_buffer;
GeglRectangle src_rect;
GeglRectangle dest_rect;
gint orig_x, orig_y;
gint orig_width, orig_height;
gint new_x, new_y;
gint new_width, new_height;
gint i;
g_return_val_if_fail (GIMP_IS_DRAWABLE (drawable), NULL);
g_return_val_if_fail (gimp_item_is_attached (GIMP_ITEM (drawable)), NULL);
g_return_val_if_fail (GIMP_IS_CONTEXT (context), NULL);
g_return_val_if_fail (GEGL_IS_BUFFER (orig_buffer), NULL);
g_return_val_if_fail (buffer_profile != NULL, NULL);
g_return_val_if_fail (new_offset_x != NULL, NULL);
g_return_val_if_fail (new_offset_y != NULL, NULL);
*buffer_profile =
gimp_color_managed_get_color_profile (GIMP_COLOR_MANAGED (drawable));
orig_x = orig_offset_x;
orig_y = orig_offset_y;
orig_width = gegl_buffer_get_width (orig_buffer);
orig_height = gegl_buffer_get_height (orig_buffer);
new_x = orig_x;
new_y = orig_y;
new_width = orig_width;
new_height = orig_height;
switch (flip_type)
{
case GIMP_ORIENTATION_HORIZONTAL:
new_x = RINT (-((gdouble) orig_x +
(gdouble) orig_width - axis) + axis);
break;
case GIMP_ORIENTATION_VERTICAL:
new_y = RINT (-((gdouble) orig_y +
(gdouble) orig_height - axis) + axis);
break;
case GIMP_ORIENTATION_UNKNOWN:
g_return_val_if_reached (NULL);
break;
}
format = gegl_buffer_get_format (orig_buffer);
new_buffer = gegl_buffer_new (GEGL_RECTANGLE (0, 0,
new_width, new_height),
format);
if (clip_result && (new_x != orig_x || new_y != orig_y))
{
GimpRGB bg;
GeglColor *color;
gint clip_x, clip_y;
gint clip_width, clip_height;
*new_offset_x = orig_x;
*new_offset_y = orig_y;
/* Use transparency, rather than the bg color, as the "outside" color of
* channels, and drawables with an alpha channel.
*/
if (GIMP_IS_CHANNEL (drawable) || babl_format_has_alpha (format))
{
gimp_rgba_set (&bg, 0.0, 0.0, 0.0, 0.0);
}
else
{
gimp_context_get_background (context, &bg);
gimp_pickable_srgb_to_image_color (GIMP_PICKABLE (drawable),
&bg, &bg);
}
color = gimp_gegl_color_new (&bg);
gegl_buffer_set_color (new_buffer, NULL, color);
g_object_unref (color);
if (gimp_rectangle_intersect (orig_x, orig_y, orig_width, orig_height,
new_x, new_y, new_width, new_height,
&clip_x, &clip_y,
&clip_width, &clip_height))
{
orig_x = new_x = clip_x - orig_x;
orig_y = new_y = clip_y - orig_y;
}
orig_width = new_width = clip_width;
orig_height = new_height = clip_height;
}
else
{
*new_offset_x = new_x;
*new_offset_y = new_y;
orig_x = 0;
orig_y = 0;
new_x = 0;
new_y = 0;
}
if (new_width == 0 && new_height == 0)
return new_buffer;
switch (flip_type)
{
case GIMP_ORIENTATION_HORIZONTAL:
src_rect.x = orig_x;
src_rect.y = orig_y;
src_rect.width = 1;
src_rect.height = orig_height;
dest_rect.x = new_x + new_width - 1;
dest_rect.y = new_y;
dest_rect.width = 1;
dest_rect.height = new_height;
for (i = 0; i < orig_width; i++)
{
src_rect.x = i + orig_x;
dest_rect.x = new_x + new_width - i - 1;
gegl_buffer_copy (orig_buffer, &src_rect, GEGL_ABYSS_NONE,
new_buffer, &dest_rect);
}
break;
case GIMP_ORIENTATION_VERTICAL:
src_rect.x = orig_x;
src_rect.y = orig_y;
src_rect.width = orig_width;
src_rect.height = 1;
dest_rect.x = new_x;
dest_rect.y = new_y + new_height - 1;
dest_rect.width = new_width;
dest_rect.height = 1;
for (i = 0; i < orig_height; i++)
{
src_rect.y = i + orig_y;
dest_rect.y = new_y + new_height - i - 1;
gegl_buffer_copy (orig_buffer, &src_rect, GEGL_ABYSS_NONE,
new_buffer, &dest_rect);
}
break;
case GIMP_ORIENTATION_UNKNOWN:
break;
}
return new_buffer;
}
static void
gimp_drawable_transform_rotate_point (gint x,
gint y,
GimpRotationType rotate_type,
gdouble center_x,
gdouble center_y,
gint *new_x,
gint *new_y)
{
g_return_if_fail (new_x != NULL);
g_return_if_fail (new_y != NULL);
switch (rotate_type)
{
case GIMP_ROTATE_90:
*new_x = RINT (center_x - (gdouble) y + center_y);
*new_y = RINT (center_y + (gdouble) x - center_x);
break;
case GIMP_ROTATE_180:
*new_x = RINT (center_x - ((gdouble) x - center_x));
*new_y = RINT (center_y - ((gdouble) y - center_y));
break;
case GIMP_ROTATE_270:
*new_x = RINT (center_x + (gdouble) y - center_y);
*new_y = RINT (center_y - (gdouble) x + center_x);
break;
default:
g_assert_not_reached ();
}
}
GeglBuffer *
gimp_drawable_transform_buffer_rotate (GimpDrawable *drawable,
GimpContext *context,
GeglBuffer *orig_buffer,
gint orig_offset_x,
gint orig_offset_y,
GimpRotationType rotate_type,
gdouble center_x,
gdouble center_y,
gboolean clip_result,
GimpColorProfile **buffer_profile,
gint *new_offset_x,
gint *new_offset_y)
{
const Babl *format;
GeglBuffer *new_buffer;
GeglRectangle src_rect;
GeglRectangle dest_rect;
gint orig_x, orig_y;
gint orig_width, orig_height;
gint orig_bpp;
gint new_x, new_y;
gint new_width, new_height;
g_return_val_if_fail (GIMP_IS_DRAWABLE (drawable), NULL);
g_return_val_if_fail (gimp_item_is_attached (GIMP_ITEM (drawable)), NULL);
g_return_val_if_fail (GIMP_IS_CONTEXT (context), NULL);
g_return_val_if_fail (GEGL_IS_BUFFER (orig_buffer), NULL);
g_return_val_if_fail (buffer_profile != NULL, NULL);
g_return_val_if_fail (new_offset_x != NULL, NULL);
g_return_val_if_fail (new_offset_y != NULL, NULL);
*buffer_profile =
gimp_color_managed_get_color_profile (GIMP_COLOR_MANAGED (drawable));
orig_x = orig_offset_x;
orig_y = orig_offset_y;
orig_width = gegl_buffer_get_width (orig_buffer);
orig_height = gegl_buffer_get_height (orig_buffer);
orig_bpp = babl_format_get_bytes_per_pixel (gegl_buffer_get_format (orig_buffer));
switch (rotate_type)
{
case GIMP_ROTATE_90:
gimp_drawable_transform_rotate_point (orig_x,
orig_y + orig_height,
rotate_type, center_x, center_y,
&new_x, &new_y);
new_width = orig_height;
new_height = orig_width;
break;
case GIMP_ROTATE_180:
gimp_drawable_transform_rotate_point (orig_x + orig_width,
orig_y + orig_height,
rotate_type, center_x, center_y,
&new_x, &new_y);
new_width = orig_width;
new_height = orig_height;
break;
case GIMP_ROTATE_270:
gimp_drawable_transform_rotate_point (orig_x + orig_width,
orig_y,
rotate_type, center_x, center_y,
&new_x, &new_y);
new_width = orig_height;
new_height = orig_width;
break;
default:
g_return_val_if_reached (NULL);
break;
}
format = gegl_buffer_get_format (orig_buffer);
if (clip_result && (new_x != orig_x || new_y != orig_y ||
new_width != orig_width || new_height != orig_height))
{
GimpRGB bg;
GeglColor *color;
gint clip_x, clip_y;
gint clip_width, clip_height;
new_buffer = gegl_buffer_new (GEGL_RECTANGLE (0, 0,
orig_width, orig_height),
format);
*new_offset_x = orig_x;
*new_offset_y = orig_y;
/* Use transparency, rather than the bg color, as the "outside" color of
* channels, and drawables with an alpha channel.
*/
if (GIMP_IS_CHANNEL (drawable) || babl_format_has_alpha (format))
{
gimp_rgba_set (&bg, 0.0, 0.0, 0.0, 0.0);
}
else
{
gimp_context_get_background (context, &bg);
gimp_pickable_srgb_to_image_color (GIMP_PICKABLE (drawable),
&bg, &bg);
}
color = gimp_gegl_color_new (&bg);
gegl_buffer_set_color (new_buffer, NULL, color);
g_object_unref (color);
if (gimp_rectangle_intersect (orig_x, orig_y, orig_width, orig_height,
new_x, new_y, new_width, new_height,
&clip_x, &clip_y,
&clip_width, &clip_height))
{
gint saved_orig_x = orig_x;
gint saved_orig_y = orig_y;
new_x = clip_x - orig_x;
new_y = clip_y - orig_y;
switch (rotate_type)
{
case GIMP_ROTATE_90:
gimp_drawable_transform_rotate_point (clip_x + clip_width,
clip_y,
GIMP_ROTATE_270,
center_x,
center_y,
&orig_x,
&orig_y);
orig_x -= saved_orig_x;
orig_y -= saved_orig_y;
orig_width = clip_height;
orig_height = clip_width;
break;
case GIMP_ROTATE_180:
orig_x = clip_x - orig_x;
orig_y = clip_y - orig_y;
orig_width = clip_width;
orig_height = clip_height;
break;
case GIMP_ROTATE_270:
gimp_drawable_transform_rotate_point (clip_x,
clip_y + clip_height,
GIMP_ROTATE_90,
center_x,
center_y,
&orig_x,
&orig_y);
orig_x -= saved_orig_x;
orig_y -= saved_orig_y;
orig_width = clip_height;
orig_height = clip_width;
break;
}
new_width = clip_width;
new_height = clip_height;
}
else
{
new_width = 0;
new_height = 0;
}
}
else
{
new_buffer = gegl_buffer_new (GEGL_RECTANGLE (0, 0,
new_width, new_height),
format);
*new_offset_x = new_x;
*new_offset_y = new_y;
orig_x = 0;
orig_y = 0;
new_x = 0;
new_y = 0;
}
if (new_width < 1 || new_height < 1)
return new_buffer;
src_rect.x = orig_x;
src_rect.y = orig_y;
src_rect.width = orig_width;
src_rect.height = orig_height;
dest_rect.x = new_x;
dest_rect.y = new_y;
dest_rect.width = new_width;
dest_rect.height = new_height;
switch (rotate_type)
{
case GIMP_ROTATE_90:
{
guchar *buf = g_new (guchar, new_height * orig_bpp);
gint i;
g_assert (new_height == orig_width);
src_rect.y = orig_y + orig_height - 1;
src_rect.height = 1;
dest_rect.x = new_x;
dest_rect.width = 1;
for (i = 0; i < orig_height; i++)
{
src_rect.y = orig_y + orig_height - 1 - i;
dest_rect.x = new_x + i;
gegl_buffer_get (orig_buffer, &src_rect, 1.0, NULL, buf,
GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
gegl_buffer_set (new_buffer, &dest_rect, 0, NULL, buf,
GEGL_AUTO_ROWSTRIDE);
}
g_free (buf);
}
break;
case GIMP_ROTATE_180:
{
guchar *buf = g_new (guchar, new_width * orig_bpp);
gint i, j, k;
g_assert (new_width == orig_width);
src_rect.y = orig_y + orig_height - 1;
src_rect.height = 1;
dest_rect.y = new_y;
dest_rect.height = 1;
for (i = 0; i < orig_height; i++)
{
src_rect.y = orig_y + orig_height - 1 - i;
dest_rect.y = new_y + i;
gegl_buffer_get (orig_buffer, &src_rect, 1.0, NULL, buf,
GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
for (j = 0; j < orig_width / 2; j++)
{
guchar *left = buf + j * orig_bpp;
guchar *right = buf + (orig_width - 1 - j) * orig_bpp;
for (k = 0; k < orig_bpp; k++)
{
guchar tmp = left[k];
left[k] = right[k];
right[k] = tmp;
}
}
gegl_buffer_set (new_buffer, &dest_rect, 0, NULL, buf,
GEGL_AUTO_ROWSTRIDE);
}
g_free (buf);
}
break;
case GIMP_ROTATE_270:
{
guchar *buf = g_new (guchar, new_width * orig_bpp);
gint i;
g_assert (new_width == orig_height);
src_rect.x = orig_x + orig_width - 1;
src_rect.width = 1;
dest_rect.y = new_y;
dest_rect.height = 1;
for (i = 0; i < orig_width; i++)
{
src_rect.x = orig_x + orig_width - 1 - i;
dest_rect.y = new_y + i;
gegl_buffer_get (orig_buffer, &src_rect, 1.0, NULL, buf,
GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
gegl_buffer_set (new_buffer, &dest_rect, 0, NULL, buf,
GEGL_AUTO_ROWSTRIDE);
}
g_free (buf);
}
break;
}
return new_buffer;
}
GimpDrawable *
gimp_drawable_transform_affine (GimpDrawable *drawable,
GimpContext *context,
const GimpMatrix3 *matrix,
GimpTransformDirection direction,
GimpInterpolationType interpolation_type,
GimpTransformResize clip_result,
GimpProgress *progress)
{
GimpImage *image;
GeglBuffer *orig_buffer;
gint orig_offset_x;
gint orig_offset_y;
gboolean new_layer;
GimpDrawable *result = NULL;
g_return_val_if_fail (GIMP_IS_DRAWABLE (drawable), NULL);
g_return_val_if_fail (gimp_item_is_attached (GIMP_ITEM (drawable)), NULL);
g_return_val_if_fail (GIMP_IS_CONTEXT (context), NULL);
g_return_val_if_fail (matrix != NULL, NULL);
g_return_val_if_fail (progress == NULL || GIMP_IS_PROGRESS (progress), NULL);
image = gimp_item_get_image (GIMP_ITEM (drawable));
/* Start a transform undo group */
gimp_image_undo_group_start (image,
GIMP_UNDO_GROUP_TRANSFORM,
C_("undo-type", "Transform"));
/* Cut/Copy from the specified drawable */
orig_buffer = gimp_drawable_transform_cut (drawable, context,
&orig_offset_x, &orig_offset_y,
&new_layer);
if (orig_buffer)
{
GeglBuffer *new_buffer;
gint new_offset_x;
gint new_offset_y;
GimpColorProfile *profile;
/* always clip unfloated buffers so they keep their size */
if (GIMP_IS_CHANNEL (drawable) &&
! babl_format_has_alpha (gegl_buffer_get_format (orig_buffer)))
clip_result = GIMP_TRANSFORM_RESIZE_CLIP;
/* also transform the mask if we are transforming an entire layer */
if (GIMP_IS_LAYER (drawable) &&
gimp_layer_get_mask (GIMP_LAYER (drawable)) &&
gimp_channel_is_empty (gimp_image_get_mask (image)))
{
GimpLayerMask *mask = gimp_layer_get_mask (GIMP_LAYER (drawable));
gimp_item_transform (GIMP_ITEM (mask), context,
matrix,
direction,
interpolation_type,
clip_result,
progress);
}
/* transform the buffer */
new_buffer = gimp_drawable_transform_buffer_affine (drawable, context,
orig_buffer,
orig_offset_x,
orig_offset_y,
matrix,
direction,
interpolation_type,
clip_result,
&profile,
&new_offset_x,
&new_offset_y,
progress);
/* Free the cut/copied buffer */
g_object_unref (orig_buffer);
if (new_buffer)
{
result = gimp_drawable_transform_paste (drawable, new_buffer, profile,
new_offset_x, new_offset_y,
new_layer);
g_object_unref (new_buffer);
}
}
/* push the undo group end */
gimp_image_undo_group_end (image);
return result;
}
GimpDrawable *
gimp_drawable_transform_flip (GimpDrawable *drawable,
GimpContext *context,
GimpOrientationType flip_type,
gdouble axis,
gboolean clip_result)
{
GimpImage *image;
GeglBuffer *orig_buffer;
gint orig_offset_x;
gint orig_offset_y;
gboolean new_layer;
GimpDrawable *result = NULL;
g_return_val_if_fail (GIMP_IS_DRAWABLE (drawable), NULL);
g_return_val_if_fail (gimp_item_is_attached (GIMP_ITEM (drawable)), NULL);
g_return_val_if_fail (GIMP_IS_CONTEXT (context), NULL);
image = gimp_item_get_image (GIMP_ITEM (drawable));
/* Start a transform undo group */
gimp_image_undo_group_start (image,
GIMP_UNDO_GROUP_TRANSFORM,
C_("undo-type", "Flip"));
/* Cut/Copy from the specified drawable */
orig_buffer = gimp_drawable_transform_cut (drawable, context,
&orig_offset_x, &orig_offset_y,
&new_layer);
if (orig_buffer)
{
GeglBuffer *new_buffer;
gint new_offset_x;
gint new_offset_y;
GimpColorProfile *profile;
/* always clip unfloated buffers so they keep their size */
if (GIMP_IS_CHANNEL (drawable) &&
! babl_format_has_alpha (gegl_buffer_get_format (orig_buffer)))
clip_result = TRUE;
/* also transform the mask if we are transforming an entire layer */
if (GIMP_IS_LAYER (drawable) &&
gimp_layer_get_mask (GIMP_LAYER (drawable)) &&
gimp_channel_is_empty (gimp_image_get_mask (image)))
{
GimpLayerMask *mask = gimp_layer_get_mask (GIMP_LAYER (drawable));
gimp_item_flip (GIMP_ITEM (mask), context,
flip_type,
axis,
clip_result);
}
/* transform the buffer */
new_buffer = gimp_drawable_transform_buffer_flip (drawable, context,
orig_buffer,
orig_offset_x,
orig_offset_y,
flip_type, axis,
clip_result,
&profile,
&new_offset_x,
&new_offset_y);
/* Free the cut/copied buffer */
g_object_unref (orig_buffer);
if (new_buffer)
{
result = gimp_drawable_transform_paste (drawable, new_buffer, profile,
new_offset_x, new_offset_y,
new_layer);
g_object_unref (new_buffer);
}
}
/* push the undo group end */
gimp_image_undo_group_end (image);
return result;
}
GimpDrawable *
gimp_drawable_transform_rotate (GimpDrawable *drawable,
GimpContext *context,
GimpRotationType rotate_type,
gdouble center_x,
gdouble center_y,
gboolean clip_result)
{
GimpImage *image;
GeglBuffer *orig_buffer;
gint orig_offset_x;
gint orig_offset_y;
gboolean new_layer;
GimpDrawable *result = NULL;
g_return_val_if_fail (GIMP_IS_DRAWABLE (drawable), NULL);
g_return_val_if_fail (gimp_item_is_attached (GIMP_ITEM (drawable)), NULL);
g_return_val_if_fail (GIMP_IS_CONTEXT (context), NULL);
image = gimp_item_get_image (GIMP_ITEM (drawable));
/* Start a transform undo group */
gimp_image_undo_group_start (image,
GIMP_UNDO_GROUP_TRANSFORM,
C_("undo-type", "Rotate"));
/* Cut/Copy from the specified drawable */
orig_buffer = gimp_drawable_transform_cut (drawable, context,
&orig_offset_x, &orig_offset_y,
&new_layer);
if (orig_buffer)
{
GeglBuffer *new_buffer;
gint new_offset_x;
gint new_offset_y;
GimpColorProfile *profile;
/* always clip unfloated buffers so they keep their size */
if (GIMP_IS_CHANNEL (drawable) &&
! babl_format_has_alpha (gegl_buffer_get_format (orig_buffer)))
clip_result = TRUE;
/* also transform the mask if we are transforming an entire layer */
if (GIMP_IS_LAYER (drawable) &&
gimp_layer_get_mask (GIMP_LAYER (drawable)) &&
gimp_channel_is_empty (gimp_image_get_mask (image)))
{
GimpLayerMask *mask = gimp_layer_get_mask (GIMP_LAYER (drawable));
gimp_item_rotate (GIMP_ITEM (mask), context,
rotate_type,
center_x,
center_y,
clip_result);
}
/* transform the buffer */
new_buffer = gimp_drawable_transform_buffer_rotate (drawable, context,
orig_buffer,
orig_offset_x,
orig_offset_y,
rotate_type,
center_x, center_y,
clip_result,
&profile,
&new_offset_x,
&new_offset_y);
/* Free the cut/copied buffer */
g_object_unref (orig_buffer);
if (new_buffer)
{
result = gimp_drawable_transform_paste (drawable, new_buffer, profile,
new_offset_x, new_offset_y,
new_layer);
g_object_unref (new_buffer);
}
}
/* push the undo group end */
gimp_image_undo_group_end (image);
return result;
}
GeglBuffer *
gimp_drawable_transform_cut (GimpDrawable *drawable,
GimpContext *context,
gint *offset_x,
gint *offset_y,
gboolean *new_layer)
{
GimpImage *image;
GeglBuffer *buffer;
g_return_val_if_fail (GIMP_IS_DRAWABLE (drawable), NULL);
g_return_val_if_fail (gimp_item_is_attached (GIMP_ITEM (drawable)), NULL);
g_return_val_if_fail (GIMP_IS_CONTEXT (context), NULL);
g_return_val_if_fail (offset_x != NULL, NULL);
g_return_val_if_fail (offset_y != NULL, NULL);
g_return_val_if_fail (new_layer != NULL, NULL);
image = gimp_item_get_image (GIMP_ITEM (drawable));
/* extract the selected mask if there is a selection */
if (! gimp_channel_is_empty (gimp_image_get_mask (image)))
{
gint x, y, w, h;
/* set the keep_indexed flag to FALSE here, since we use
* gimp_layer_new_from_gegl_buffer() later which assumes that
* the buffer are either RGB or GRAY. Eeek!!! (Sven)
*/
if (gimp_item_mask_intersect (GIMP_ITEM (drawable), &x, &y, &w, &h))
{
buffer = gimp_selection_extract (GIMP_SELECTION (gimp_image_get_mask (image)),
GIMP_PICKABLE (drawable),
context,
TRUE, FALSE, TRUE,
offset_x, offset_y,
NULL);
/* clear the selection */
gimp_channel_clear (gimp_image_get_mask (image), NULL, TRUE);
*new_layer = TRUE;
}
else
{
buffer = NULL;
*new_layer = FALSE;
}
}
else /* otherwise, just copy the layer */
{
buffer = gimp_selection_extract (GIMP_SELECTION (gimp_image_get_mask (image)),
GIMP_PICKABLE (drawable),
context,
FALSE, TRUE, GIMP_IS_LAYER (drawable),
offset_x, offset_y,
NULL);
*new_layer = FALSE;
}
return buffer;
}
GimpDrawable *
gimp_drawable_transform_paste (GimpDrawable *drawable,
GeglBuffer *buffer,
GimpColorProfile *buffer_profile,
gint offset_x,
gint offset_y,
gboolean new_layer)
{
GimpImage *image;
GimpLayer *layer = NULL;
const gchar *undo_desc = NULL;
g_return_val_if_fail (GIMP_IS_DRAWABLE (drawable), NULL);
g_return_val_if_fail (gimp_item_is_attached (GIMP_ITEM (drawable)), NULL);
g_return_val_if_fail (GEGL_IS_BUFFER (buffer), NULL);
g_return_val_if_fail (GIMP_IS_COLOR_PROFILE (buffer_profile), NULL);
image = gimp_item_get_image (GIMP_ITEM (drawable));
if (GIMP_IS_LAYER (drawable))
undo_desc = C_("undo-type", "Transform Layer");
else if (GIMP_IS_CHANNEL (drawable))
undo_desc = C_("undo-type", "Transform Channel");
else
return NULL;
gimp_image_undo_group_start (image, GIMP_UNDO_GROUP_EDIT_PASTE, undo_desc);
if (new_layer)
{
layer =
gimp_layer_new_from_gegl_buffer (buffer, image,
gimp_drawable_get_format_with_alpha (drawable),
_("Transformation"),
GIMP_OPACITY_OPAQUE,
GIMP_LAYER_MODE_NORMAL_LEGACY,
buffer_profile);
gimp_item_set_offset (GIMP_ITEM (layer), offset_x, offset_y);
floating_sel_attach (layer, drawable);
drawable = GIMP_DRAWABLE (layer);
}
else
{
gimp_drawable_set_buffer_full (drawable, TRUE, NULL,
buffer,
offset_x, offset_y);
}
gimp_image_undo_group_end (image);
return drawable;
}
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