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Gimp/app/core/gimpdrawable-transform.c
Jehan 2821dbab58 app: add generic support for less destructive transform tools. 
This commit will make all transform tools run on a link layer cumulate
their transform matrix on top of the previous transform steps. It means
that as long as you don't edit the pixels another way (e.g. with a paint
tool), all your transformations will apply as a single transformation.

For instance it means that applying several transform tool steps on a
monitored link layer will be less destructive than applying the exact
same transformations on the exact same "normal" layer contents.
Even scaling an image to 1x1 then back to a big size will work very
fine!

Note nevertheless the following limitations in current implementation:

* The link layer with transformations will still show as a standard link
  layer. Nothing says it has transformation applied on it right now.
* To drop transformations applied on a link layer, you have to discard
  the link info, then monitor the link again. A specific action in the
  contextual menu could be worth it.
* This should work with all transform tools (scale, rotation, unified,
  perspective, 3D, even Warp…) but it won't work for the Flip tool, nor
  will it work for the Transform actions. I will need to implement
  GimpItem's rotate(), flip() and resize() methods next.
* The layer mask would still be destructively transformed (I have not
  made any tests with layer masks yet, but this should be done next
  too).
* I think that the "scaled-only" property is now meaningless. It is now
  being replaced by the presence of the GimpMatrix3. Nevertheless I have
  still not removed this property.
* The load/save code has not been redone yet to include all these
  changes.

The kind of caveats we'd have to know about (and which are not planned
for change, because it's just how it is):

* Any intermediate interpolation methods are dropped when cumulating
  transform steps. Only the last interpolation is stored. This is
  because anyway the interpolation is only there as the best algorithm
  where we visually see the less quality loss. Applying several
  transformations as a single matrix will always be visually better than
  applying several matrices (whatever the intermediate interpolation
  methods chosen).
* This only works with the "Adjust" clipping method (basically no
  clipping) because 2 transform steps with clipping won't produce the
  same result as the multiplied matrix with clipping. It means that
  applying a transform with clipping will downgrade your link layer to
  being a normal layer.
  The only issue I have with this is how to best convey that clipping is
  a major setting setting here, which disables our less-destructive
  abilities. Right now, people will just have to "know" it.
* Vector link layers in particular will have 2 levels of
  non/less-destructivity transforms. In particular any scaling (both
  through "Scale Image", "Scale Layers" and transform tools — since I
  added code to detect a matrix doing only scaling and optionally
  translation) done **first** will be completely non-destructive since
  we will simply reload the original vector source at the right
  dimensions. Any other kind of transforms will be appended through the
  cumulative matrix, as raster link layers. This also includes scaling
  done **after** other transforms, since we cannot easily move the
  scaling first (matrix multiplication is not commutative). This second
  level of scaling will therefore be *less* destructive, but still
  destructive.
  It is possible eventually to improve the whole thing if we add some
  day the ability to request loading a vector image with a transform
  matrix (it will then be up to each vector format plug-in to support
  this feature or not).

Note: it could be argued that this whole implementation could in fact be
moved over to base layers, since it would allow also less-destructivity
when applying multiple transformations in a row. We would only merge
results once we edit pixels more directly.
But I think that it's not a bad idea to experiment with this new code in
the link layer. Eventually I may likely move this to the parent
GimpLayer if no blocking issues are found.
2025-08-27 11:34:04 +02:00

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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 <https://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"
/* 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);
/* 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,
&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;
GeglBufferIterator *iter;
GeglRectangle src_rect;
GeglRectangle dest_rect;
gint bpp;
gint orig_x, orig_y;
gint orig_width, orig_height;
gint new_x, new_y;
gint new_width, new_height;
gint x, y;
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);
bpp = babl_format_get_bytes_per_pixel (format);
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))
{
GeglColor *color = NULL;
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))
{
color = gegl_color_new ("black");
gegl_color_set_rgba_with_space (color, 0.0, 0.0, 0.0, 0.0,
gimp_drawable_get_space (drawable));
}
else
{
color = gegl_color_duplicate (gimp_context_get_background (context));
}
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;
dest_rect.x = new_x;
dest_rect.y = new_y;
dest_rect.width = new_width;
dest_rect.height = new_height;
iter = gegl_buffer_iterator_new (new_buffer, &dest_rect, 0, NULL,
GEGL_BUFFER_WRITE, GEGL_ABYSS_NONE, 1);
switch (flip_type)
{
case GIMP_ORIENTATION_HORIZONTAL:
while (gegl_buffer_iterator_next (iter))
{
gint stride = iter->items[0].roi.width * bpp;
src_rect = iter->items[0].roi;
src_rect.x = (orig_x + orig_width) -
(iter->items[0].roi.x - dest_rect.x) -
iter->items[0].roi.width;
gegl_buffer_get (orig_buffer, &src_rect, 1.0, NULL, iter->items[0].data,
stride, GEGL_ABYSS_NONE);
for (y = 0; y < iter->items[0].roi.height; y++)
{
guint8 *left = iter->items[0].data;
guint8 *right = iter->items[0].data;
left += y * stride;
right += y * stride + (iter->items[0].roi.width - 1) * bpp;
for (x = 0; x < iter->items[0].roi.width / 2; x++)
{
guint8 temp[bpp];
memcpy (temp, left, bpp);
memcpy (left, right, bpp);
memcpy (right, temp, bpp);
left += bpp;
right -= bpp;
}
}
}
break;
case GIMP_ORIENTATION_VERTICAL:
while (gegl_buffer_iterator_next (iter))
{
gint stride = iter->items[0].roi.width * bpp;
src_rect = iter->items[0].roi;
src_rect.y = (orig_y + orig_height) -
(iter->items[0].roi.y - dest_rect.y) -
iter->items[0].roi.height;
gegl_buffer_get (orig_buffer, &src_rect, 1.0, NULL, iter->items[0].data,
stride, GEGL_ABYSS_NONE);
for (x = 0; x < iter->items[0].roi.width; x++)
{
guint8 *top = iter->items[0].data;
guint8 *bottom = iter->items[0].data;
top += x * bpp;
bottom += x * bpp + (iter->items[0].roi.height - 1) * stride;
for (y = 0; y < iter->items[0].roi.height / 2; y++)
{
guint8 temp[bpp];
memcpy (temp, top, bpp);
memcpy (top, bottom, bpp);
memcpy (bottom, temp, bpp);
top += stride;
bottom -= stride;
}
}
}
break;
case GIMP_ORIENTATION_UNKNOWN:
gegl_buffer_iterator_stop (iter);
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_DEGREES90:
*new_x = RINT (center_x - (gdouble) y + center_y);
*new_y = RINT (center_y + (gdouble) x - center_x);
break;
case GIMP_ROTATE_DEGREES180:
*new_x = RINT (center_x - ((gdouble) x - center_x));
*new_y = RINT (center_y - ((gdouble) y - center_y));
break;
case GIMP_ROTATE_DEGREES270:
*new_x = RINT (center_x + (gdouble) y - center_y);
*new_y = RINT (center_y - (gdouble) x + center_x);
break;
default:
*new_x = x;
*new_y = y;
g_return_if_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_DEGREES90:
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_DEGREES180:
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_DEGREES270:
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))
{
GeglColor *color = NULL;
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))
{
color = gegl_color_new ("black");
gegl_color_set_rgba_with_space (color, 0.0, 0.0, 0.0, 0.0,
gimp_drawable_get_space (drawable));
}
else
{
color = gegl_color_duplicate (gimp_context_get_background (context));
}
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_DEGREES90:
gimp_drawable_transform_rotate_point (clip_x + clip_width,
clip_y,
GIMP_ROTATE_DEGREES270,
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_DEGREES180:
orig_x = clip_x - orig_x;
orig_y = clip_y - orig_y;
orig_width = clip_width;
orig_height = clip_height;
break;
case GIMP_ROTATE_DEGREES270:
gimp_drawable_transform_rotate_point (clip_x,
clip_y + clip_height,
GIMP_ROTATE_DEGREES90,
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_DEGREES90:
{
guchar *buf = g_new (guchar, new_height * orig_bpp);
gint i;
/* Not cool, we leak memory if we return, but anyway that is
* never supposed to happen. If we see this warning, a bug has
* to be fixed!
*/
g_return_val_if_fail (new_height == orig_width, NULL);
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_DEGREES180:
{
guchar *buf = g_new (guchar, new_width * orig_bpp);
gint i, j, k;
/* Not cool, we leak memory if we return, but anyway that is
* never supposed to happen. If we see this warning, a bug has
* to be fixed!
*/
g_return_val_if_fail (new_width == orig_width, NULL);
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_DEGREES270:
{
guchar *buf = g_new (guchar, new_width * orig_bpp);
gint i;
/* Not cool, we leak memory if we return, but anyway that is
* never supposed to happen. If we see this warning, a bug has
* to be fixed!
*/
g_return_val_if_fail (new_width == orig_height, NULL);
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;
GList *drawables;
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 */
drawables = g_list_prepend (NULL, drawable);
orig_buffer = gimp_drawable_transform_cut (drawables, context,
&orig_offset_x, &orig_offset_y,
&new_layer);
g_free (drawables);
if (orig_buffer)
{
GeglBuffer *new_buffer;
gint new_offset_x;
gint new_offset_y;
GimpColorProfile *profile;
/* 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, TRUE);
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;
GList *drawables;
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 */
drawables = g_list_prepend (NULL, drawable);
orig_buffer = gimp_drawable_transform_cut (drawables, context,
&orig_offset_x, &orig_offset_y,
&new_layer);
g_free (drawables);
if (orig_buffer)
{
GeglBuffer *new_buffer;
gint new_offset_x;
gint new_offset_y;
GimpColorProfile *profile;
/* 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, TRUE);
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;
GList *drawables;
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 */
drawables = g_list_prepend (NULL, drawable);
orig_buffer = gimp_drawable_transform_cut (drawables, context,
&orig_offset_x, &orig_offset_y,
&new_layer);
g_free (drawables);
if (orig_buffer)
{
GeglBuffer *new_buffer;
gint new_offset_x;
gint new_offset_y;
GimpColorProfile *profile;
/* 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, TRUE);
g_object_unref (new_buffer);
}
}
/* push the undo group end */
gimp_image_undo_group_end (image);
return result;
}
GeglBuffer *
gimp_drawable_transform_cut (GList *drawables,
GimpContext *context,
gint *offset_x,
gint *offset_y,
gboolean *new_layer)
{
GimpImage *image = NULL;
GeglBuffer *buffer = NULL;
GList *iter;
gboolean drawables_are_layers = FALSE;
g_return_val_if_fail (g_list_length (drawables), 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);
for (iter = drawables; iter; iter = iter->next)
{
g_return_val_if_fail (GIMP_IS_DRAWABLE (iter->data), NULL);
g_return_val_if_fail (gimp_item_is_attached (iter->data), NULL);
if (! image)
image = gimp_item_get_image (iter->data);
else
g_return_val_if_fail (image == gimp_item_get_image (iter->data), NULL);
if (drawables_are_layers)
g_return_val_if_fail (GIMP_IS_LAYER (iter->data), NULL);
else if (GIMP_IS_LAYER (iter->data))
drawables_are_layers = TRUE;
}
/* 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_image_mask_intersect (image, drawables, &x, &y, &w, &h))
{
buffer = gimp_selection_extract (GIMP_SELECTION (gimp_image_get_mask (image)),
drawables, 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)),
drawables, context,
FALSE, TRUE,
drawables_are_layers,
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,
gboolean push_undo)
{
GimpImage *image;
GimpLayer *layer = 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 (push_undo)
{
const gchar *undo_desc = NULL;
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_image_get_default_new_layer_mode (image),
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, push_undo, NULL,
buffer,
GEGL_RECTANGLE (offset_x, offset_y, 0, 0),
TRUE);
}
if (push_undo)
gimp_image_undo_group_end (image);
return drawable;
}
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