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gimp/app/core/gimplayer.c

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/* TODO: make sure has_alpha gets set */
/* 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 <string.h>
#include <gtk/gtk.h>
#include "libgimpmath/gimpmath.h"
#include "apptypes.h"
#include "boundary.h"
#include "drawable.h"
#include "floating_sel.h"
#include "gdisplay.h"
#include "gimage_mask.h"
#include "gimpimage.h"
#include "gimplayer.h"
#include "gimplayermask.h"
#include "parasitelist.h"
#include "paint_funcs.h"
#include "pixel_region.h"
#include "undo.h"
#include "temp_buf.h"
#include "tile_manager.h"
#include "tile.h"
#include "libgimp/gimpparasite.h"
#include "libgimp/gimpintl.h"
static void gimp_layer_class_init (GimpLayerClass *klass);
static void gimp_layer_init (GimpLayer *layer);
static void gimp_layer_destroy (GtkObject *object);
static void gimp_layer_invalidate_preview (GimpViewable *viewable);
static void gimp_layer_transform_color (GimpImage *gimage,
PixelRegion *layerPR,
PixelRegion *bufPR,
GimpDrawable *drawable,
GimpImageBaseType type);
static GimpDrawableClass *parent_class = NULL;
GtkType
gimp_layer_get_type (void)
{
static GtkType layer_type = 0;
if (! layer_type)
{
GtkTypeInfo layer_info =
{
"GimpLayer",
sizeof (GimpLayer),
sizeof (GimpLayerClass),
(GtkClassInitFunc) gimp_layer_class_init,
(GtkObjectInitFunc) gimp_layer_init,
/* reserved_1 */ NULL,
/* reserved_2 */ NULL,
(GtkClassInitFunc) NULL,
};
layer_type = gtk_type_unique (GIMP_TYPE_DRAWABLE, &layer_info);
}
return layer_type;
}
static void
gimp_layer_class_init (GimpLayerClass *klass)
{
GtkObjectClass *object_class;
GimpDrawableClass *drawable_class;
GimpViewableClass *viewable_class;
object_class = (GtkObjectClass *) klass;
drawable_class = (GimpDrawableClass *) klass;
viewable_class = (GimpViewableClass *) klass;
parent_class = gtk_type_class (GIMP_TYPE_DRAWABLE);
object_class->destroy = gimp_layer_destroy;
viewable_class->invalidate_preview = gimp_layer_invalidate_preview;
}
static void
gimp_layer_init (GimpLayer *layer)
{
layer->linked = FALSE;
layer->preserve_trans = FALSE;
layer->mask = NULL;
layer->apply_mask = FALSE;
layer->edit_mask = FALSE;
layer->show_mask = FALSE;
layer->opacity = 100;
layer->mode = NORMAL_MODE;
/* floating selection */
layer->fs.backing_store = NULL;
layer->fs.drawable = NULL;
layer->fs.initial = TRUE;
layer->fs.boundary_known = FALSE;
layer->fs.segs = NULL;
layer->fs.num_segs = 0;
}
static void
gimp_layer_invalidate_preview (GimpViewable *viewable)
{
GimpLayer *layer;
layer = GIMP_LAYER (viewable);
if (gimp_layer_is_floating_sel (layer))
{
floating_sel_invalidate (layer);
}
else
{
if (GIMP_VIEWABLE_CLASS (parent_class)->invalidate_preview)
GIMP_VIEWABLE_CLASS (parent_class)->invalidate_preview (viewable);
}
}
static void
gimp_layer_transform_color (GimpImage *gimage,
PixelRegion *layerPR,
PixelRegion *bufPR,
GimpDrawable *drawable,
GimpImageBaseType type)
{
gint i;
gint h;
guchar *s;
guchar *d;
gpointer pr;
for (pr = pixel_regions_register (2, layerPR, bufPR);
pr != NULL;
pr = pixel_regions_process (pr))
{
h = layerPR->h;
s = bufPR->data;
d = layerPR->data;
while (h--)
{
for (i = 0; i < layerPR->w; i++)
{
gimp_image_transform_color (gimage, drawable,
s + (i * bufPR->bytes),
d + (i * layerPR->bytes), type);
/* copy alpha channel */
d[(i + 1) * layerPR->bytes - 1] = s[(i + 1) * bufPR->bytes - 1];
}
s += bufPR->rowstride;
d += layerPR->rowstride;
}
}
}
/**************************/
/* Function definitions */
/**************************/
GimpLayer *
gimp_layer_new (GimpImage *gimage,
gint width,
gint height,
GimpImageType type,
const gchar *name,
gint opacity,
LayerModeEffects mode)
{
GimpLayer *layer;
if (width < 1 || height < 1)
{
g_message (_("Zero width or height layers not allowed."));
return NULL;
}
layer = gtk_type_new (GIMP_TYPE_LAYER);
gimp_drawable_configure (GIMP_DRAWABLE (layer),
gimage, width, height, type, name);
/* mode and opacity */
layer->mode = mode;
layer->opacity = opacity;
return layer;
}
GimpLayer *
gimp_layer_copy (GimpLayer *layer,
gboolean add_alpha)
{
gchar *layer_name;
GimpLayer *new_layer;
GimpImageType new_type;
gchar *ext;
gint number;
const gchar *name;
gint len;
PixelRegion srcPR;
PixelRegion destPR;
/* formulate the new layer name */
name = gimp_object_get_name (GIMP_OBJECT (layer));
ext = strrchr (name, '#');
len = strlen (_("copy"));
if ((strlen(name) >= len &&
strcmp (&name[strlen (name) - len], _("copy")) == 0) ||
(ext && (number = atoi (ext + 1)) > 0 &&
((gint) (log10 (number) + 1)) == strlen (ext + 1)))
/* don't have redundant "copy"s */
layer_name = g_strdup (name);
else
layer_name = g_strdup_printf (_("%s copy"), name);
/* when copying a layer, the copy ALWAYS has an alpha channel */
if (add_alpha)
{
switch (GIMP_DRAWABLE (layer)->type)
{
case RGB_GIMAGE:
new_type = RGBA_GIMAGE;
break;
case GRAY_GIMAGE:
new_type = GRAYA_GIMAGE;
break;
case INDEXED_GIMAGE:
new_type = INDEXEDA_GIMAGE;
break;
default:
new_type = GIMP_DRAWABLE (layer)->type;
break;
}
}
else
{
new_type = GIMP_DRAWABLE (layer)->type;
}
/* allocate a new layer object */
new_layer = gimp_layer_new (GIMP_DRAWABLE (layer)->gimage,
GIMP_DRAWABLE (layer)->width,
GIMP_DRAWABLE (layer)->height,
new_type,
layer_name,
layer->opacity,
layer->mode);
if (! new_layer)
{
g_message ("gimp_layer_copy: could not allocate new layer");
goto cleanup;
}
GIMP_DRAWABLE (new_layer)->offset_x = GIMP_DRAWABLE (layer)->offset_x;
GIMP_DRAWABLE (new_layer)->offset_y = GIMP_DRAWABLE (layer)->offset_y;
GIMP_DRAWABLE (new_layer)->visible = GIMP_DRAWABLE (layer)->visible;
new_layer->linked = layer->linked;
new_layer->preserve_trans = layer->preserve_trans;
/* copy the contents across layers */
if (new_type == GIMP_DRAWABLE (layer)->type)
{
pixel_region_init (&srcPR, GIMP_DRAWABLE (layer)->tiles,
0, 0,
GIMP_DRAWABLE (layer)->width,
GIMP_DRAWABLE (layer)->height,
FALSE);
pixel_region_init (&destPR, GIMP_DRAWABLE(new_layer)->tiles,
0, 0,
GIMP_DRAWABLE (layer)->width,
GIMP_DRAWABLE (layer)->height,
TRUE);
copy_region (&srcPR, &destPR);
}
else
{
pixel_region_init (&srcPR, GIMP_DRAWABLE (layer)->tiles,
0, 0,
GIMP_DRAWABLE (layer)->width,
GIMP_DRAWABLE (layer)->height,
FALSE);
pixel_region_init (&destPR, GIMP_DRAWABLE (new_layer)->tiles,
0, 0,
GIMP_DRAWABLE (layer)->width,
GIMP_DRAWABLE(layer)->height,
TRUE);
add_alpha_region (&srcPR, &destPR);
}
/* duplicate the layer mask if necessary */
if (layer->mask)
{
new_layer->mask = gimp_layer_mask_copy (layer->mask);
gtk_object_ref (GTK_OBJECT (new_layer->mask));
gtk_object_sink (GTK_OBJECT (new_layer->mask));
new_layer->apply_mask = layer->apply_mask;
new_layer->edit_mask = layer->edit_mask;
new_layer->show_mask = layer->show_mask;
gimp_layer_mask_set_layer (new_layer->mask, new_layer);
}
/* copy the parasites */
gtk_object_unref (GTK_OBJECT (GIMP_DRAWABLE (new_layer)->parasites));
GIMP_DRAWABLE (new_layer)->parasites
= parasite_list_copy (GIMP_DRAWABLE (layer)->parasites);
cleanup:
/* free up the layer_name memory */
g_free (layer_name);
return new_layer;
}
GimpLayer *
gimp_layer_new_from_tiles (GimpImage *gimage,
GimpImageType layer_type,
TileManager *tiles,
gchar *name,
gint opacity,
LayerModeEffects mode)
{
GimpLayer *new_layer;
PixelRegion layerPR;
PixelRegion bufPR;
/* Function copies buffer to a layer
* taking into consideration the possibility of transforming
* the contents to meet the requirements of the target image type
*/
/* If no image or no tile manager, return NULL */
if (!gimage || !tiles )
return NULL;
/* the layer_type needs to have alpha */
g_return_val_if_fail (GIMP_IMAGE_TYPE_HAS_ALPHA (layer_type), NULL);
/* Create the new layer */
new_layer = gimp_layer_new (0,
tile_manager_width (tiles),
tile_manager_height (tiles),
layer_type,
name,
opacity,
mode);
if (!new_layer)
{
g_message ("gimp_layer_new_from_tiles: could not allocate new layer");
return NULL;
}
/* Configure the pixel regions */
pixel_region_init (&layerPR, GIMP_DRAWABLE (new_layer)->tiles,
0, 0,
GIMP_DRAWABLE (new_layer)->width,
GIMP_DRAWABLE (new_layer)->height,
TRUE);
pixel_region_init (&bufPR, tiles,
0, 0,
GIMP_DRAWABLE (new_layer)->width,
GIMP_DRAWABLE (new_layer)->height,
FALSE);
if ((tile_manager_bpp (tiles) == 4 &&
GIMP_DRAWABLE (new_layer)->type == RGBA_GIMAGE) ||
(tile_manager_bpp (tiles) == 2 &&
GIMP_DRAWABLE (new_layer)->type == GRAYA_GIMAGE))
/* If we want a layer the same type as the buffer */
copy_region (&bufPR, &layerPR);
else
/* Transform the contents of the buf to the new_layer */
gimp_layer_transform_color (gimage, &layerPR, &bufPR,
GIMP_DRAWABLE (new_layer),
(tile_manager_bpp (tiles) == 4) ? RGB : GRAY);
return new_layer;
}
GimpLayerMask *
gimp_layer_add_mask (GimpLayer *layer,
GimpLayerMask *mask)
{
if (layer->mask)
return NULL;
layer->mask = mask;
gtk_object_ref (GTK_OBJECT (layer->mask));
gtk_object_sink (GTK_OBJECT (layer->mask));
gimp_layer_mask_set_layer (mask, layer);
/* Set the application mode in the layer to "apply" */
layer->apply_mask = TRUE;
layer->edit_mask = TRUE;
layer->show_mask = FALSE;
drawable_update (GIMP_DRAWABLE (layer),
0, 0,
GIMP_DRAWABLE (layer)->width,
GIMP_DRAWABLE (layer)->height);
return layer->mask;
}
GimpLayerMask *
gimp_layer_create_mask (GimpLayer *layer,
AddMaskType add_mask_type)
{
PixelRegion maskPR;
PixelRegion layerPR;
GimpLayerMask *mask;
gchar *mask_name;
GimpRGB black = { 0.0, 0.0, 0.0, 1.0 };
guchar white_mask = OPAQUE_OPACITY;
guchar black_mask = TRANSPARENT_OPACITY;
mask_name = g_strdup_printf (_("%s mask"),
gimp_object_get_name (GIMP_OBJECT (layer)));
/* Create the layer mask */
mask = gimp_layer_mask_new (GIMP_DRAWABLE (layer)->gimage,
GIMP_DRAWABLE (layer)->width,
GIMP_DRAWABLE (layer)->height,
mask_name, &black);
GIMP_DRAWABLE (mask)->offset_x = GIMP_DRAWABLE (layer)->offset_x;
GIMP_DRAWABLE (mask)->offset_y = GIMP_DRAWABLE (layer)->offset_y;
pixel_region_init (&maskPR, GIMP_DRAWABLE (mask)->tiles,
0, 0,
GIMP_DRAWABLE (mask)->width, GIMP_DRAWABLE (mask)->height,
TRUE);
switch (add_mask_type)
{
case ADD_WHITE_MASK:
color_region (&maskPR, &white_mask);
break;
case ADD_BLACK_MASK:
color_region (&maskPR, &black_mask);
break;
case ADD_ALPHA_MASK:
/* Extract the layer's alpha channel */
if (gimp_layer_has_alpha (layer))
{
pixel_region_init (&layerPR, GIMP_DRAWABLE (layer)->tiles,
0, 0,
GIMP_DRAWABLE (layer)->width,
GIMP_DRAWABLE (layer)->height,
FALSE);
extract_alpha_region (&layerPR, NULL, &maskPR);
}
break;
}
g_free (mask_name);
return mask;
}
static void
gimp_layer_destroy (GtkObject *object)
{
GimpLayer *layer;
g_return_if_fail (object != NULL);
g_return_if_fail (GIMP_IS_LAYER (object));
layer = GIMP_LAYER (object);
/* if a layer mask exists, free it */
if (layer->mask)
gtk_object_unref (GTK_OBJECT (layer->mask));
/* free the layer boundary if it exists */
if (layer->fs.segs)
g_free (layer->fs.segs);
/* free the floating selection if it exists */
if (gimp_layer_is_floating_sel (layer))
{
tile_manager_destroy (layer->fs.backing_store);
}
if (GTK_OBJECT_CLASS (parent_class)->destroy)
GTK_OBJECT_CLASS (parent_class)->destroy (object);
}
void
gimp_layer_apply_mask (GimpLayer *layer,
MaskApplyMode mode)
{
PixelRegion srcPR, maskPR;
if (! layer->mask)
return;
/* this operation can only be done to layers with an alpha channel */
if (! gimp_layer_has_alpha (layer))
return;
/* Need to save the mask here for undo */
if (mode == APPLY)
{
/* Put this apply mask operation on the undo stack */
drawable_apply_image (GIMP_DRAWABLE (layer),
0, 0,
GIMP_DRAWABLE (layer)->width,
GIMP_DRAWABLE (layer)->height,
NULL, FALSE);
/* Combine the current layer's alpha channel and the mask */
pixel_region_init (&srcPR, GIMP_DRAWABLE (layer)->tiles,
0, 0,
GIMP_DRAWABLE (layer)->width,
GIMP_DRAWABLE(layer)->height,
TRUE);
pixel_region_init (&maskPR, GIMP_DRAWABLE (layer->mask)->tiles,
0, 0,
GIMP_DRAWABLE (layer)->width,
GIMP_DRAWABLE(layer)->height,
FALSE);
apply_mask_to_region (&srcPR, &maskPR, OPAQUE_OPACITY);
GIMP_DRAWABLE (layer)->preview_valid = FALSE;
layer->mask = NULL;
layer->apply_mask = FALSE;
layer->edit_mask = FALSE;
layer->show_mask = FALSE;
}
else if (mode == DISCARD)
{
layer->mask = NULL;
layer->apply_mask = FALSE;
layer->edit_mask = FALSE;
layer->show_mask = FALSE;
}
}
void
gimp_layer_translate (GimpLayer *layer,
gint off_x,
gint off_y)
{
/* the undo call goes here */
undo_push_layer_displace (GIMP_DRAWABLE (layer)->gimage, layer);
/* update the affected region */
drawable_update (GIMP_DRAWABLE (layer),
0, 0,
GIMP_DRAWABLE (layer)->width,
GIMP_DRAWABLE (layer)->height);
/* invalidate the selection boundary because of a layer modification */
gimp_layer_invalidate_boundary (layer);
/* update the layer offsets */
GIMP_DRAWABLE (layer)->offset_x += off_x;
GIMP_DRAWABLE (layer)->offset_y += off_y;
/* update the affected region */
drawable_update (GIMP_DRAWABLE (layer),
0, 0,
GIMP_DRAWABLE (layer)->width,
GIMP_DRAWABLE (layer)->height);
if (layer->mask)
{
GIMP_DRAWABLE (layer->mask)->offset_x += off_x;
GIMP_DRAWABLE (layer->mask)->offset_y += off_y;
/* invalidate the mask preview */
gimp_viewable_invalidate_preview (GIMP_VIEWABLE (layer->mask));
}
}
void
gimp_layer_add_alpha (GimpLayer *layer)
{
PixelRegion srcPR, destPR;
TileManager *new_tiles;
GimpImageType type;
/* Don't bother if the layer already has alpha */
switch (GIMP_DRAWABLE (layer)->type)
{
case RGB_GIMAGE:
type = RGBA_GIMAGE;
break;
case GRAY_GIMAGE:
type = GRAYA_GIMAGE;
break;
case INDEXED_GIMAGE:
type = INDEXEDA_GIMAGE;
break;
case RGBA_GIMAGE:
case GRAYA_GIMAGE:
case INDEXEDA_GIMAGE:
default:
return;
break;
}
/* Configure the pixel regions */
pixel_region_init (&srcPR, GIMP_DRAWABLE (layer)->tiles,
0, 0,
GIMP_DRAWABLE (layer)->width,
GIMP_DRAWABLE (layer)->height,
FALSE);
/* Allocate the new layer, configure dest region */
new_tiles = tile_manager_new (GIMP_DRAWABLE (layer)->width,
GIMP_DRAWABLE (layer)->height,
GIMP_DRAWABLE (layer)->bytes + 1);
pixel_region_init (&destPR, new_tiles,
0, 0,
GIMP_DRAWABLE (layer)->width,
GIMP_DRAWABLE (layer)->height,
TRUE);
/* Add an alpha channel */
add_alpha_region (&srcPR, &destPR);
/* Push the layer on the undo stack */
undo_push_layer_mod (GIMP_DRAWABLE (layer)->gimage, layer);
/* Configure the new layer */
GIMP_DRAWABLE (layer)->tiles = new_tiles;
GIMP_DRAWABLE (layer)->type = type;
GIMP_DRAWABLE (layer)->bytes = GIMP_DRAWABLE(layer)->bytes + 1;
GIMP_DRAWABLE (layer)->has_alpha = GIMP_IMAGE_TYPE_HAS_ALPHA (type);
GIMP_DRAWABLE (layer)->preview_valid = FALSE;
gtk_signal_emit_by_name
(GTK_OBJECT (gimp_drawable_gimage (GIMP_DRAWABLE (layer))), "restructure");
}
static void
gimp_layer_scale_lowlevel (GimpLayer *layer,
gint new_width,
gint new_height,
gint new_offset_x,
gint new_offset_y)
{
PixelRegion srcPR, destPR;
TileManager *new_tiles;
/* Update the old layer position */
drawable_update (GIMP_DRAWABLE (layer),
0, 0,
GIMP_DRAWABLE (layer)->width,
GIMP_DRAWABLE (layer)->height);
/* Configure the pixel regions */
pixel_region_init (&srcPR, GIMP_DRAWABLE(layer)->tiles,
0, 0,
GIMP_DRAWABLE (layer)->width,
GIMP_DRAWABLE (layer)->height,
FALSE);
/* Allocate the new layer, configure dest region */
new_tiles = tile_manager_new (new_width, new_height,
GIMP_DRAWABLE (layer)->bytes);
pixel_region_init (&destPR, new_tiles,
0, 0,
new_width, new_height,
TRUE);
/* Scale the layer -
* If the layer is of type INDEXED, then we don't use pixel-value
* resampling because that doesn't necessarily make sense for INDEXED
* images.
*/
if ((GIMP_DRAWABLE (layer)->type == INDEXED_GIMAGE) ||
(GIMP_DRAWABLE (layer)->type == INDEXEDA_GIMAGE))
scale_region_no_resample (&srcPR, &destPR);
else
scale_region (&srcPR, &destPR);
/* Push the layer on the undo stack */
undo_push_layer_mod (GIMP_DRAWABLE (layer)->gimage, layer);
/* Configure the new layer */
GIMP_DRAWABLE (layer)->offset_x = new_offset_x;
GIMP_DRAWABLE (layer)->offset_y = new_offset_y;
GIMP_DRAWABLE (layer)->tiles = new_tiles;
GIMP_DRAWABLE (layer)->width = new_width;
GIMP_DRAWABLE (layer)->height = new_height;
/* If there is a layer mask, make sure it gets scaled also */
if (layer->mask)
{
GIMP_DRAWABLE (layer->mask)->offset_x = GIMP_DRAWABLE (layer)->offset_x;
GIMP_DRAWABLE (layer->mask)->offset_y = GIMP_DRAWABLE (layer)->offset_y;
gimp_channel_scale (GIMP_CHANNEL (layer->mask), new_width, new_height);
}
/* Make sure we're not caching any old selection info */
gimp_layer_invalidate_boundary (layer);
/* Update the new layer position */
drawable_update (GIMP_DRAWABLE (layer),
0, 0,
GIMP_DRAWABLE (layer)->width,
GIMP_DRAWABLE (layer)->height);
}
/**
* gimp_layer_check_scaling:
* @layer: Layer to check
* @new_width: proposed width of layer, in pixels
* @new_height: proposed height of layer, in pixels
*
* Scales layer dimensions, then snaps them to pixel centers
*
* Returns FALSE if any dimension reduces to zero as a result
* of this; otherwise, returns TRUE.
*/
gboolean
gimp_layer_check_scaling (GimpLayer *layer,
gint new_width,
gint new_height)
{
GimpImage *gimage;
gdouble img_scale_w;
gdouble img_scale_h;
gint new_layer_width;
gint new_layer_height;
gimage = GIMP_DRAWABLE (layer)->gimage;
img_scale_w = (gdouble) new_width / (gdouble) gimage->width;
img_scale_h = (gdouble) new_height / (gdouble) gimage->height;
new_layer_width = ROUND (img_scale_w *
(gdouble) GIMP_DRAWABLE (layer)->width);
new_layer_height = ROUND (img_scale_h *
(gdouble) GIMP_DRAWABLE (layer)->height);
return (new_layer_width != 0 && new_layer_height != 0);
}
/**
* gimp_layer_scale_by_factors:
* @layer: Layer to be transformed by explicit width and height factors.
* @w_factor: scale factor to apply to width and horizontal offset
* @h_factor: scale factor to apply to height and vertical offset
*
* Scales layer dimensions and offsets by uniform width and
* height factors.
*
* Use gimp_layer_scale_by_factors() in circumstances when the
* same width and height scaling factors are to be uniformly
* applied to a set of layers. In this context, the layer's
* dimensions and offsets from the sides of the containing
* image all change by these predetermined factors. By fiat,
* the fixed point of the transform is the upper left hand
* corner of the image. Returns gboolean FALSE if a requested
* scale factor is zero or if a scaling zero's out a layer
* dimension; returns TRUE otherwise.
*
* Use gimp_layer_scale() in circumstances where new layer width
* and height dimensions are predetermined instead.
*
* Side effects: Undo set created for layer. Old layer imagery
* scaled & painted to new layer tiles.
*
* Returns: TRUE, if the scaled layer has positive dimensions
* FALSE if the scaled layer has at least one zero dimension
*/
gboolean
gimp_layer_scale_by_factors (GimpLayer *layer,
gdouble w_factor,
gdouble h_factor)
{
gint new_width, new_height;
gint new_offset_x, new_offset_y;
if (w_factor == 0.0 || h_factor == 0.0)
{
g_message ("gimp_layer_scale_by_factors: Error. Requested width or height scale equals zero.");
return FALSE;
}
new_offset_x = ROUND (w_factor * (gdouble) GIMP_DRAWABLE (layer)->offset_x);
new_offset_y = ROUND (h_factor * (gdouble) GIMP_DRAWABLE (layer)->offset_y);
new_width = ROUND (w_factor * (gdouble) GIMP_DRAWABLE (layer)->width);
new_height = ROUND (h_factor * (gdouble) GIMP_DRAWABLE (layer)->height);
if (new_width != 0 && new_height != 0)
{
gimp_layer_scale_lowlevel (layer,
new_width, new_height,
new_offset_x, new_offset_y);
return TRUE;
}
return FALSE;
}
/**
* gimp_layer_scale:
* @layer: The layer to be transformed by width & height scale factors
* @new_width: The width that layer will acquire
* @new_height: The height that the layer will acquire
* @local_origin: sets fixed point of the scaling transform. See below.
*
* Sets layer dimensions to new_width and
* new_height. Derives vertical and horizontal scaling
* transforms from new width and height. If local_origin is
* TRUE, the fixed point of the scaling transform coincides
* with the layer's center point. Otherwise, the fixed
* point is taken to be [-GIMP_DRAWABLE(layer)->offset_x,
* -GIMP_DRAWABLE(layer)->offset_y].
*
* Since this function derives scale factors from new and
* current layer dimensions, these factors will vary from
* layer to layer because of aliasing artifacts; factor
* variations among layers can be quite large where layer
* dimensions approach pixel dimensions. Use
* gimp_layer_scale_by_factors() where constant scales are to
* be uniformly applied to a number of layers.
*
* Side effects: undo set created for layer.
* Old layer imagery scaled
* & painted to new layer tiles
*/
void
gimp_layer_scale (GimpLayer *layer,
gint new_width,
gint new_height,
gboolean local_origin)
{
gint new_offset_x, new_offset_y;
if (new_width == 0 || new_height == 0)
{
g_message ("gimp_layer_scale: Error. Requested width or height equals zero.");
return;
}
if (local_origin)
{
new_offset_x = GIMP_DRAWABLE (layer)->offset_x +
((GIMP_DRAWABLE (layer)->width - new_width) / 2.0);
new_offset_y = GIMP_DRAWABLE (layer)->offset_y +
((GIMP_DRAWABLE (layer)->height - new_height) / 2.0);
}
else
{
new_offset_x = (gint) (((gdouble) new_width *
GIMP_DRAWABLE (layer)->offset_x /
(gdouble) GIMP_DRAWABLE (layer)->width));
new_offset_y = (gint) (((gdouble) new_height *
GIMP_DRAWABLE (layer)->offset_y /
(gdouble) GIMP_DRAWABLE (layer)->height));
}
gimp_layer_scale_lowlevel (layer,
new_width, new_height,
new_offset_x, new_offset_y);
}
void
gimp_layer_resize (GimpLayer *layer,
gint new_width,
gint new_height,
gint offx,
gint offy)
{
PixelRegion srcPR, destPR;
TileManager *new_tiles;
gint w, h;
gint x1, y1, x2, y2;
if (new_width < 1 || new_height < 1)
return;
x1 = CLAMP (offx, 0, new_width);
y1 = CLAMP (offy, 0, new_height);
x2 = CLAMP ((offx + GIMP_DRAWABLE(layer)->width), 0, new_width);
y2 = CLAMP ((offy + GIMP_DRAWABLE(layer)->height), 0, new_height);
w = x2 - x1;
h = y2 - y1;
if (offx > 0)
{
x1 = 0;
x2 = offx;
}
else
{
x1 = -offx;
x2 = 0;
}
if (offy > 0)
{
y1 = 0;
y2 = offy;
}
else
{
y1 = -offy;
y2 = 0;
}
/* Update the old layer position */
drawable_update (GIMP_DRAWABLE( layer),
0, 0,
GIMP_DRAWABLE (layer)->width,
GIMP_DRAWABLE (layer)->height);
/* Configure the pixel regions */
pixel_region_init (&srcPR, GIMP_DRAWABLE (layer)->tiles,
x1, y1,
w, h,
FALSE);
/* Allocate the new layer, configure dest region */
new_tiles = tile_manager_new (new_width, new_height,
GIMP_DRAWABLE (layer)->bytes);
pixel_region_init (&destPR, new_tiles,
0, 0,
new_width, new_height,
TRUE);
/* fill with the fill color */
if (gimp_layer_has_alpha (layer))
{
/* Set to transparent and black */
guchar bg[4] = {0, 0, 0, 0};
color_region (&destPR, bg);
}
else
{
guchar bg[3];
gimp_image_get_background (GIMP_DRAWABLE (layer)->gimage,
GIMP_DRAWABLE (layer), bg);
color_region (&destPR, bg);
}
pixel_region_init (&destPR, new_tiles,
x2, y2,
w, h,
TRUE);
/* copy from the old to the new */
if (w && h)
copy_region (&srcPR, &destPR);
/* Push the layer on the undo stack */
undo_push_layer_mod (GIMP_DRAWABLE(layer)->gimage, layer);
/* Configure the new layer */
GIMP_DRAWABLE (layer)->tiles = new_tiles;
GIMP_DRAWABLE (layer)->offset_x = x1 + GIMP_DRAWABLE (layer)->offset_x - x2;
GIMP_DRAWABLE (layer)->offset_y = y1 + GIMP_DRAWABLE (layer)->offset_y - y2;
GIMP_DRAWABLE (layer)->width = new_width;
GIMP_DRAWABLE (layer)->height = new_height;
/* If there is a layer mask, make sure it gets resized also */
if (layer->mask)
{
GIMP_DRAWABLE (layer->mask)->offset_x = GIMP_DRAWABLE (layer)->offset_x;
GIMP_DRAWABLE (layer->mask)->offset_y = GIMP_DRAWABLE (layer)->offset_y;
gimp_channel_resize (GIMP_CHANNEL (layer->mask),
new_width, new_height, offx, offy);
}
/* Make sure we're not caching any old selection info */
gimp_layer_invalidate_boundary (layer);
/* update the new layer area */
drawable_update (GIMP_DRAWABLE (layer),
0, 0,
GIMP_DRAWABLE (layer)->width,
GIMP_DRAWABLE (layer)->height);
}
void
gimp_layer_resize_to_image (GimpLayer *layer)
{
GimpImage *gimage;
gint offset_x;
gint offset_y;
if (!(gimage = GIMP_DRAWABLE (layer)->gimage))
return;
undo_push_group_start (gimage, LAYER_RESIZE_UNDO);
if (gimp_layer_is_floating_sel (layer))
floating_sel_relax (layer, TRUE);
gimp_drawable_offsets (GIMP_DRAWABLE (layer), &offset_x, &offset_y);
gimp_layer_resize (layer, gimage->width, gimage->height, offset_x, offset_y);
if (gimp_layer_is_floating_sel (layer))
floating_sel_rigor (layer, TRUE);
undo_push_group_end (gimage);
}
BoundSeg *
gimp_layer_boundary (GimpLayer *layer,
gint *num_segs)
{
BoundSeg *new_segs;
/* Create the four boundary segments that encompass this
* layer's boundary.
*/
new_segs = g_new (BoundSeg, 4);
*num_segs = 4;
/* if the layer is a floating selection */
if (gimp_layer_is_floating_sel (layer))
{
if (GIMP_IS_CHANNEL (layer->fs.drawable))
{
/* if the owner drawable is a channel, just return nothing */
g_free (new_segs);
*num_segs = 0;
return NULL;
}
else
{
/* otherwise, set the layer to the owner drawable */
layer = GIMP_LAYER (layer->fs.drawable);
}
}
new_segs[0].x1 = GIMP_DRAWABLE (layer)->offset_x;
new_segs[0].y1 = GIMP_DRAWABLE (layer)->offset_y;
new_segs[0].x2 = GIMP_DRAWABLE (layer)->offset_x;
new_segs[0].y2 = GIMP_DRAWABLE (layer)->offset_y + GIMP_DRAWABLE (layer)->height;
new_segs[0].open = 1;
new_segs[1].x1 = GIMP_DRAWABLE (layer)->offset_x;
new_segs[1].y1 = GIMP_DRAWABLE (layer)->offset_y;
new_segs[1].x2 = GIMP_DRAWABLE (layer)->offset_x + GIMP_DRAWABLE (layer)->width;
new_segs[1].y2 = GIMP_DRAWABLE (layer)->offset_y;
new_segs[1].open = 1;
new_segs[2].x1 = GIMP_DRAWABLE (layer)->offset_x + GIMP_DRAWABLE (layer)->width;
new_segs[2].y1 = GIMP_DRAWABLE (layer)->offset_y;
new_segs[2].x2 = GIMP_DRAWABLE (layer)->offset_x + GIMP_DRAWABLE (layer)->width;
new_segs[2].y2 = GIMP_DRAWABLE (layer)->offset_y + GIMP_DRAWABLE (layer)->height;
new_segs[2].open = 0;
new_segs[3].x1 = GIMP_DRAWABLE (layer)->offset_x;
new_segs[3].y1 = GIMP_DRAWABLE (layer)->offset_y + GIMP_DRAWABLE (layer)->height;
new_segs[3].x2 = GIMP_DRAWABLE (layer)->offset_x + GIMP_DRAWABLE (layer)->width;
new_segs[3].y2 = GIMP_DRAWABLE (layer)->offset_y + GIMP_DRAWABLE (layer)->height;
new_segs[3].open = 0;
return new_segs;
}
void
gimp_layer_invalidate_boundary (GimpLayer *layer)
{
GimpImage *gimage;
GimpChannel *mask;
if (! (gimage = gimp_drawable_gimage (GIMP_DRAWABLE (layer))))
return;
/* Turn the current selection off */
gdisplays_selection_visibility (gimage, SelectionOff);
/* clear the affected region surrounding the layer */
gdisplays_selection_visibility (gimage, SelectionLayerOff);
/* get the selection mask channel */
mask = gimp_image_get_mask (gimage);
/* Only bother with the bounds if there is a selection */
if (! gimp_channel_is_empty (mask))
{
mask->bounds_known = FALSE;
mask->boundary_known = FALSE;
}
if (gimp_layer_is_floating_sel (layer))
floating_sel_invalidate (layer);
}
gint
gimp_layer_pick_correlate (GimpLayer *layer,
gint x,
gint y)
{
Tile *tile;
Tile *mask_tile;
gint val;
/* Is the point inside the layer?
* First transform the point to layer coordinates...
*/
x -= GIMP_DRAWABLE (layer)->offset_x;
y -= GIMP_DRAWABLE (layer)->offset_y;
if (x >= 0 && x < GIMP_DRAWABLE (layer)->width &&
y >= 0 && y < GIMP_DRAWABLE (layer)->height &&
GIMP_DRAWABLE (layer)->visible)
{
/* If the point is inside, and the layer has no
* alpha channel, success!
*/
if (! gimp_layer_has_alpha (layer))
return TRUE;
/* Otherwise, determine if the alpha value at
* the given point is non-zero
*/
tile = tile_manager_get_tile (GIMP_DRAWABLE(layer)->tiles,
x, y, TRUE, FALSE);
val = * ((guchar *) tile_data_pointer (tile,
x % TILE_WIDTH,
y % TILE_HEIGHT) +
tile_bpp (tile) - 1);
if (layer->mask)
{
guchar *ptr;
mask_tile = tile_manager_get_tile (GIMP_DRAWABLE(layer->mask)->tiles,
x, y, TRUE, FALSE);
ptr = tile_data_pointer (mask_tile, x % TILE_WIDTH, y % TILE_HEIGHT);
val = val * (*ptr) / 255;
tile_release (mask_tile, FALSE);
}
tile_release (tile, FALSE);
if (val > 63)
return TRUE;
}
return FALSE;
}
/**********************/
/* access functions */
/**********************/
GimpLayerMask *
gimp_layer_get_mask (GimpLayer *layer)
{
return layer->mask;
}
gboolean
gimp_layer_has_alpha (GimpLayer *layer)
{
g_return_val_if_fail (layer != NULL, FALSE);
g_return_val_if_fail (GIMP_IS_LAYER (layer), FALSE);
return GIMP_IMAGE_TYPE_HAS_ALPHA (GIMP_DRAWABLE (layer)->type);
}
gboolean
gimp_layer_is_floating_sel (GimpLayer *layer)
{
g_return_val_if_fail (layer != NULL, FALSE);
g_return_val_if_fail (GIMP_IS_LAYER (layer), FALSE);
return (layer->fs.drawable != NULL);
}
gboolean
gimp_layer_linked (GimpLayer *layer)
{
return layer->linked;
}
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