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gimp/app/text/gimptextlayer.c

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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* GimpTextLayer
* Copyright (C) 2002-2004 Sven Neumann <sven@gimp.org>
*
* 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 <string.h>
#include <gegl.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include <pango/pangocairo.h>
#include "libgimpbase/gimpbase.h"
#include "libgimpconfig/gimpconfig.h"
#include "libgimpwidgets/gimpcairo-utils.h"
#include "text-types.h"
#include "base/pixel-region.h"
#include "base/tile-manager.h"
#include "paint-funcs/paint-funcs.h"
#include "core/gimp.h"
#include "core/gimp-utils.h"
#include "core/gimpcontext.h"
#include "core/gimpcontainer.h"
#include "core/gimpimage.h"
#include "core/gimpimage-undo.h"
#include "core/gimpimage-undo-push.h"
#include "core/gimpitemtree.h"
#include "core/gimpparasitelist.h"
#include "gimptext.h"
#include "gimptextlayer.h"
#include "gimptextlayer-transform.h"
#include "gimptextlayout.h"
#include "gimptextlayout-render.h"
#include "gimp-intl.h"
enum
{
PROP_0,
PROP_TEXT,
PROP_AUTO_RENAME,
PROP_MODIFIED
};
static void gimp_text_layer_finalize (GObject *object);
static void gimp_text_layer_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec);
static void gimp_text_layer_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
static gint64 gimp_text_layer_get_memsize (GimpObject *object,
gint64 *gui_size);
static GimpItem * gimp_text_layer_duplicate (GimpItem *item,
GType new_type);
static gboolean gimp_text_layer_rename (GimpItem *item,
const gchar *new_name,
const gchar *undo_desc,
GError **error);
static void gimp_text_layer_set_tiles (GimpDrawable *drawable,
gboolean push_undo,
const gchar *undo_desc,
TileManager *tiles,
GimpImageType type,
gint offset_x,
gint offset_y);
static void gimp_text_layer_push_undo (GimpDrawable *drawable,
const gchar *undo_desc,
TileManager *tiles,
gboolean sparse,
gint x,
gint y,
gint width,
gint height);
static void gimp_text_layer_text_changed (GimpTextLayer *layer);
static gboolean gimp_text_layer_render (GimpTextLayer *layer);
static void gimp_text_layer_render_layout (GimpTextLayer *layer,
GimpTextLayout *layout);
G_DEFINE_TYPE (GimpTextLayer, gimp_text_layer, GIMP_TYPE_LAYER)
#define parent_class gimp_text_layer_parent_class
static void
gimp_text_layer_class_init (GimpTextLayerClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GimpObjectClass *gimp_object_class = GIMP_OBJECT_CLASS (klass);
GimpViewableClass *viewable_class = GIMP_VIEWABLE_CLASS (klass);
GimpItemClass *item_class = GIMP_ITEM_CLASS (klass);
GimpDrawableClass *drawable_class = GIMP_DRAWABLE_CLASS (klass);
object_class->finalize = gimp_text_layer_finalize;
object_class->get_property = gimp_text_layer_get_property;
object_class->set_property = gimp_text_layer_set_property;
gimp_object_class->get_memsize = gimp_text_layer_get_memsize;
viewable_class->default_stock_id = "gimp-text-layer";
item_class->duplicate = gimp_text_layer_duplicate;
item_class->rename = gimp_text_layer_rename;
#if 0
item_class->scale = gimp_text_layer_scale;
item_class->flip = gimp_text_layer_flip;
item_class->rotate = gimp_text_layer_rotate;
item_class->transform = gimp_text_layer_transform;
#endif
item_class->default_name = _("Text Layer");
item_class->rename_desc = _("Rename Text Layer");
item_class->translate_desc = _("Move Text Layer");
item_class->scale_desc = _("Scale Text Layer");
item_class->resize_desc = _("Resize Text Layer");
item_class->flip_desc = _("Flip Text Layer");
item_class->rotate_desc = _("Rotate Text Layer");
item_class->transform_desc = _("Transform Text Layer");
drawable_class->set_tiles = gimp_text_layer_set_tiles;
drawable_class->push_undo = gimp_text_layer_push_undo;
GIMP_CONFIG_INSTALL_PROP_OBJECT (object_class, PROP_TEXT,
"text", NULL,
GIMP_TYPE_TEXT,
GIMP_PARAM_STATIC_STRINGS);
GIMP_CONFIG_INSTALL_PROP_BOOLEAN (object_class, PROP_AUTO_RENAME,
"auto-rename", NULL,
TRUE,
GIMP_PARAM_STATIC_STRINGS);
GIMP_CONFIG_INSTALL_PROP_BOOLEAN (object_class, PROP_MODIFIED,
"modified", NULL,
FALSE,
GIMP_PARAM_STATIC_STRINGS);
}
static void
gimp_text_layer_init (GimpTextLayer *layer)
{
layer->text = NULL;
layer->text_parasite = NULL;
}
static void
gimp_text_layer_finalize (GObject *object)
{
GimpTextLayer *layer = GIMP_TEXT_LAYER (object);
if (layer->text)
{
g_object_unref (layer->text);
layer->text = NULL;
}
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gimp_text_layer_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
GimpTextLayer *text_layer = GIMP_TEXT_LAYER (object);
switch (property_id)
{
case PROP_TEXT:
g_value_set_object (value, text_layer->text);
break;
case PROP_AUTO_RENAME:
g_value_set_boolean (value, text_layer->auto_rename);
break;
case PROP_MODIFIED:
g_value_set_boolean (value, text_layer->modified);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gimp_text_layer_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
GimpTextLayer *text_layer = GIMP_TEXT_LAYER (object);
switch (property_id)
{
case PROP_TEXT:
gimp_text_layer_set_text (text_layer, g_value_get_object (value));
break;
case PROP_AUTO_RENAME:
text_layer->auto_rename = g_value_get_boolean (value);
break;
case PROP_MODIFIED:
text_layer->modified = g_value_get_boolean (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static gint64
gimp_text_layer_get_memsize (GimpObject *object,
gint64 *gui_size)
{
GimpTextLayer *text_layer = GIMP_TEXT_LAYER (object);
gint64 memsize = 0;
memsize += gimp_object_get_memsize (GIMP_OBJECT (text_layer->text),
gui_size);
return memsize + GIMP_OBJECT_CLASS (parent_class)->get_memsize (object,
gui_size);
}
static GimpItem *
gimp_text_layer_duplicate (GimpItem *item,
GType new_type)
{
GimpItem *new_item;
g_return_val_if_fail (g_type_is_a (new_type, GIMP_TYPE_DRAWABLE), NULL);
new_item = GIMP_ITEM_CLASS (parent_class)->duplicate (item, new_type);
if (GIMP_IS_TEXT_LAYER (new_item))
{
GimpTextLayer *layer = GIMP_TEXT_LAYER (item);
GimpTextLayer *new_layer = GIMP_TEXT_LAYER (new_item);
gimp_config_sync (G_OBJECT (layer), G_OBJECT (new_layer), 0);
if (layer->text)
{
GimpText *text = gimp_config_duplicate (GIMP_CONFIG (layer->text));
gimp_text_layer_set_text (new_layer, text);
g_object_unref (text);
}
/* this is just the parasite name, not a pointer to the parasite */
if (layer->text_parasite)
new_layer->text_parasite = layer->text_parasite;
}
return new_item;
}
static gboolean
gimp_text_layer_rename (GimpItem *item,
const gchar *new_name,
const gchar *undo_desc,
GError **error)
{
if (GIMP_ITEM_CLASS (parent_class)->rename (item, new_name, undo_desc, error))
{
g_object_set (item, "auto-rename", FALSE, NULL);
return TRUE;
}
return FALSE;
}
static void
gimp_text_layer_set_tiles (GimpDrawable *drawable,
gboolean push_undo,
const gchar *undo_desc,
TileManager *tiles,
GimpImageType type,
gint offset_x,
gint offset_y)
{
GimpTextLayer *layer = GIMP_TEXT_LAYER (drawable);
GimpImage *image = gimp_item_get_image (GIMP_ITEM (layer));
if (push_undo && ! layer->modified)
gimp_image_undo_group_start (image, GIMP_UNDO_GROUP_DRAWABLE_MOD,
undo_desc);
GIMP_DRAWABLE_CLASS (parent_class)->set_tiles (drawable,
push_undo, undo_desc,
tiles, type,
offset_x, offset_y);
if (push_undo && ! layer->modified)
{
gimp_image_undo_push_text_layer_modified (image, NULL, layer);
g_object_set (drawable, "modified", TRUE, NULL);
gimp_image_undo_group_end (image);
}
}
static void
gimp_text_layer_push_undo (GimpDrawable *drawable,
const gchar *undo_desc,
TileManager *tiles,
gboolean sparse,
gint x,
gint y,
gint width,
gint height)
{
GimpTextLayer *layer = GIMP_TEXT_LAYER (drawable);
GimpImage *image = gimp_item_get_image (GIMP_ITEM (layer));
if (! layer->modified)
gimp_image_undo_group_start (image, GIMP_UNDO_GROUP_DRAWABLE, undo_desc);
GIMP_DRAWABLE_CLASS (parent_class)->push_undo (drawable, undo_desc,
tiles, sparse,
x, y, width, height);
if (! layer->modified)
{
gimp_image_undo_push_text_layer_modified (image, NULL, layer);
g_object_set (drawable, "modified", TRUE, NULL);
gimp_image_undo_group_end (image);
}
}
/* public functions */
/**
* gimp_text_layer_new:
* @image: the #GimpImage the layer should belong to
* @text: a #GimpText object
*
* Creates a new text layer.
*
* Return value: a new #GimpTextLayer or %NULL in case of a problem
**/
GimpLayer *
gimp_text_layer_new (GimpImage *image,
GimpText *text)
{
GimpTextLayer *layer;
GimpImageType type;
g_return_val_if_fail (GIMP_IS_IMAGE (image), NULL);
g_return_val_if_fail (GIMP_IS_TEXT (text), NULL);
if (! text->text && ! text->markup)
return NULL;
type = gimp_image_base_type_with_alpha (image);
layer = GIMP_TEXT_LAYER (gimp_drawable_new (GIMP_TYPE_TEXT_LAYER,
image, NULL,
0, 0, 1, 1,
type));
gimp_text_layer_set_text (layer, text);
if (! gimp_text_layer_render (layer))
{
g_object_unref (layer);
return NULL;
}
return GIMP_LAYER (layer);
}
void
gimp_text_layer_set_text (GimpTextLayer *layer,
GimpText *text)
{
g_return_if_fail (GIMP_IS_TEXT_LAYER (layer));
g_return_if_fail (text == NULL || GIMP_IS_TEXT (text));
if (layer->text == text)
return;
if (layer->text)
{
g_signal_handlers_disconnect_by_func (layer->text,
G_CALLBACK (gimp_text_layer_text_changed),
layer);
g_object_unref (layer->text);
layer->text = NULL;
}
if (text)
{
layer->text = g_object_ref (text);
g_signal_connect_object (text, "changed",
G_CALLBACK (gimp_text_layer_text_changed),
layer, G_CONNECT_SWAPPED);
}
g_object_notify (G_OBJECT (layer), "text");
gimp_viewable_invalidate_preview (GIMP_VIEWABLE (layer));
}
GimpText *
gimp_text_layer_get_text (GimpTextLayer *layer)
{
g_return_val_if_fail (GIMP_IS_TEXT_LAYER (layer), NULL);
return layer->text;
}
void
gimp_text_layer_set (GimpTextLayer *layer,
const gchar *undo_desc,
const gchar *first_property_name,
...)
{
GimpImage *image;
GimpText *text;
va_list var_args;
g_return_if_fail (gimp_item_is_text_layer (GIMP_ITEM (layer)));
g_return_if_fail (gimp_item_is_attached (GIMP_ITEM (layer)));
text = gimp_text_layer_get_text (layer);
if (! text)
return;
image = gimp_item_get_image (GIMP_ITEM (layer));
gimp_image_undo_group_start (image, GIMP_UNDO_GROUP_TEXT, undo_desc);
g_object_freeze_notify (G_OBJECT (layer));
if (layer->modified)
{
gimp_image_undo_push_text_layer_modified (image, NULL, layer);
/* pass copy_tiles = TRUE so we not only ref the tiles; after
* being a text layer again, undo doesn't care about the
* layer's pixels any longer because they are generated, so
* changing the text would happily overwrite the layer's
* pixels, changing the pixels on the undo stack too without
* any chance to ever undo again.
*/
gimp_image_undo_push_drawable_mod (image, NULL,
GIMP_DRAWABLE (layer), TRUE);
}
gimp_image_undo_push_text_layer (image, undo_desc, layer, NULL);
va_start (var_args, first_property_name);
g_object_set_valist (G_OBJECT (text), first_property_name, var_args);
va_end (var_args);
g_object_set (layer, "modified", FALSE, NULL);
g_object_thaw_notify (G_OBJECT (layer));
gimp_image_undo_group_end (image);
}
/**
* gimp_text_layer_discard:
* @layer: a #GimpTextLayer
*
* Discards the text information. This makes @layer behave like a
* normal layer.
*/
void
gimp_text_layer_discard (GimpTextLayer *layer)
{
g_return_if_fail (GIMP_IS_TEXT_LAYER (layer));
g_return_if_fail (gimp_item_is_attached (GIMP_ITEM (layer)));
if (! layer->text)
return;
gimp_image_undo_push_text_layer (gimp_item_get_image (GIMP_ITEM (layer)),
_("Discard Text Information"),
layer, NULL);
gimp_text_layer_set_text (layer, NULL);
}
gboolean
gimp_item_is_text_layer (GimpItem *item)
{
return (GIMP_IS_TEXT_LAYER (item) &&
GIMP_TEXT_LAYER (item)->text &&
GIMP_TEXT_LAYER (item)->modified == FALSE);
}
/* private functions */
static void
gimp_text_layer_text_changed (GimpTextLayer *layer)
{
/* If the text layer was created from a parasite, it's time to
* remove that parasite now.
*/
if (layer->text_parasite)
{
/* Don't push an undo because the parasite only exists temporarily
* while the text layer is loaded from XCF.
*/
gimp_item_parasite_detach (GIMP_ITEM (layer), layer->text_parasite,
FALSE);
layer->text_parasite = NULL;
}
gimp_text_layer_render (layer);
}
static gboolean
gimp_text_layer_render (GimpTextLayer *layer)
{
GimpDrawable *drawable;
GimpItem *item;
GimpImage *image;
GimpTextLayout *layout;
gint width;
gint height;
if (! layer->text)
return FALSE;
drawable = GIMP_DRAWABLE (layer);
item = GIMP_ITEM (layer);
image = gimp_item_get_image (item);
if (gimp_container_is_empty (image->gimp->fonts))
{
gimp_message_literal (image->gimp, NULL, GIMP_MESSAGE_ERROR,
_("Due to lack of any fonts, "
"text functionality is not available."));
return FALSE;
}
layout = gimp_text_layout_new (layer->text, image);
g_object_freeze_notify (G_OBJECT (drawable));
if (gimp_text_layout_get_size (layout, &width, &height) &&
(width != gimp_item_get_width (item) ||
height != gimp_item_get_height (item)))
{
TileManager *new_tiles = tile_manager_new (width, height,
drawable->bytes);
gimp_drawable_set_tiles (drawable, FALSE, NULL, new_tiles,
gimp_drawable_type (drawable));
tile_manager_unref (new_tiles);
if (gimp_layer_get_mask (GIMP_LAYER (layer)))
{
GimpLayerMask *mask = gimp_layer_get_mask (GIMP_LAYER (layer));
static GimpContext *unused_eek = NULL;
if (! unused_eek)
unused_eek = gimp_context_new (image->gimp, "eek", NULL);
gimp_item_resize (GIMP_ITEM (mask), unused_eek, width, height, 0, 0);
}
}
if (layer->auto_rename)
{
GimpItem *item = GIMP_ITEM (layer);
gchar *name = NULL;
if (layer->text->text)
{
name = gimp_utf8_strtrim (layer->text->text, 30);
}
else if (layer->text->markup)
{
gchar *tmp = gimp_markup_extract_text (layer->text->markup);
name = gimp_utf8_strtrim (tmp, 30);
g_free (tmp);
}
if (! name)
name = g_strdup (_("Empty Text Layer"));
if (gimp_item_is_attached (item))
{
gimp_item_tree_rename_item (gimp_item_get_tree (item), item,
name, FALSE, NULL);
g_free (name);
}
else
{
gimp_object_take_name (GIMP_OBJECT (layer), name);
}
}
gimp_text_layer_render_layout (layer, layout);
g_object_unref (layout);
g_object_thaw_notify (G_OBJECT (drawable));
return (width > 0 && height > 0);
}
static void
gimp_text_layer_render_layout (GimpTextLayer *layer,
GimpTextLayout *layout)
{
GimpDrawable *drawable = GIMP_DRAWABLE (layer);
GimpItem *item = GIMP_ITEM (layer);
GimpImage *image = gimp_item_get_image (item);
cairo_t *cr;
cairo_surface_t *surface;
PixelRegion layerPR;
const guchar *data;
GimpImageType layer_type;
gint layer_alpha_byte;
gint rowstride;
gint width;
gint height;
gpointer pr;
g_return_if_fail (gimp_drawable_has_alpha (drawable));
width = gimp_item_get_width (item);
height = gimp_item_get_height (item);
surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, width, height);
cr = cairo_create (surface);
gimp_text_layout_render (layout, cr, layer->text->base_dir, FALSE);
cairo_destroy (cr);
pixel_region_init (&layerPR, gimp_drawable_get_tiles (drawable),
0, 0, width, height, TRUE);
layer_type = gimp_drawable_type (drawable);
layer_alpha_byte = layerPR.bytes - 1;
cairo_surface_flush (surface);
data = cairo_image_surface_get_data (surface);
rowstride = cairo_image_surface_get_stride (surface);
for (pr = pixel_regions_register (1, &layerPR);
pr != NULL;
pr = pixel_regions_process (pr))
{
const guchar *src = data + layerPR.y * rowstride + layerPR.x * 4;
guchar *dest = layerPR.data;
gint rows = layerPR.h;
while (rows--)
{
const guchar *s = src;
guchar *d = dest;
gint w = layerPR.w;
while (w--)
{
guchar color[4];
GIMP_CAIRO_ARGB32_GET_PIXEL (s,
color[0],
color[1],
color[2],
color[3]);
gimp_image_transform_color (image,
layer_type, d, GIMP_RGB, color);
d[layer_alpha_byte] = color[3];
s += 4;
d += layerPR.bytes;
}
src += rowstride;
dest += layerPR.rowstride;
}
}
cairo_surface_destroy (surface);
gimp_drawable_update (drawable, 0, 0, width, height);
}
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