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gtk2/gtk/gtkpango.c
Benjamin Otte 43c212ac28 build: Enable -Wswitch-enum and -Wswitch-default 
This patch makes that work using 1 of 2 options:

1. Add all missing enums to the switch statement
  or
2. Cast the switch argument to a uint to avoid having to do that (mostly
   for GdkEventType).

I even found a bug while doing that: clearing a GtkImage with a surface
did not notify thae surface property.

The reason for enabling this flag even though it is tedious at times is
that it is very useful when adding values to an enum, because it makes
GTK immediately warn about all the switch statements where this enum is
relevant.
And I expect changes to enums to be frequent during the GTK4 development
cycle.
2017-10-06 21:23:39 +02:00

1284 lines
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/* gtkpango.c - pango-related utilities
*
* Copyright (c) 2010 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.Free
*/
/*
* Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
* file for a list of people on the GTK+ Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
*/
#include "config.h"
#include "gtkpango.h"
#include <pango/pangocairo.h>
#include "gtkintl.h"
#define GTK_TYPE_FILL_LAYOUT_RENDERER (_gtk_fill_layout_renderer_get_type())
#define GTK_FILL_LAYOUT_RENDERER(object) (G_TYPE_CHECK_INSTANCE_CAST ((object), GTK_TYPE_FILL_LAYOUT_RENDERER, GtkFillLayoutRenderer))
#define GTK_IS_FILL_LAYOUT_RENDERER(object) (G_TYPE_CHECK_INSTANCE_TYPE ((object), GTK_TYPE_FILL_LAYOUT_RENDERER))
#define GTK_FILL_LAYOUT_RENDERER_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GTK_TYPE_FILL_LAYOUT_RENDERER, GtkFillLayoutRendererClass))
#define GTK_IS_FILL_LAYOUT_RENDERER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GTK_TYPE_FILL_LAYOUT_RENDERER))
#define GTK_FILL_LAYOUT_RENDERER_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GTK_TYPE_FILL_LAYOUT_RENDERER, GtkFillLayoutRendererClass))
typedef struct _GtkFillLayoutRenderer GtkFillLayoutRenderer;
typedef struct _GtkFillLayoutRendererClass GtkFillLayoutRendererClass;
struct _GtkFillLayoutRenderer
{
PangoRenderer parent_instance;
cairo_t *cr;
};
struct _GtkFillLayoutRendererClass
{
PangoRendererClass parent_class;
};
GType _gtk_fill_layout_renderer_get_type (void);
G_DEFINE_TYPE (GtkFillLayoutRenderer, _gtk_fill_layout_renderer, PANGO_TYPE_RENDERER)
static void
gtk_fill_layout_renderer_draw_glyphs (PangoRenderer *renderer,
PangoFont *font,
PangoGlyphString *glyphs,
int x,
int y)
{
GtkFillLayoutRenderer *text_renderer = GTK_FILL_LAYOUT_RENDERER (renderer);
cairo_move_to (text_renderer->cr, (double)x / PANGO_SCALE, (double)y / PANGO_SCALE);
pango_cairo_show_glyph_string (text_renderer->cr, font, glyphs);
}
static void
gtk_fill_layout_renderer_draw_glyph_item (PangoRenderer *renderer,
const char *text,
PangoGlyphItem *glyph_item,
int x,
int y)
{
GtkFillLayoutRenderer *text_renderer = GTK_FILL_LAYOUT_RENDERER (renderer);
cairo_move_to (text_renderer->cr, (double)x / PANGO_SCALE, (double)y / PANGO_SCALE);
pango_cairo_show_glyph_item (text_renderer->cr, text, glyph_item);
}
static void
gtk_fill_layout_renderer_draw_rectangle (PangoRenderer *renderer,
PangoRenderPart part,
int x,
int y,
int width,
int height)
{
GtkFillLayoutRenderer *text_renderer = GTK_FILL_LAYOUT_RENDERER (renderer);
if (part == PANGO_RENDER_PART_BACKGROUND)
return;
cairo_rectangle (text_renderer->cr,
(double)x / PANGO_SCALE, (double)y / PANGO_SCALE,
(double)width / PANGO_SCALE, (double)height / PANGO_SCALE);
cairo_fill (text_renderer->cr);
}
static void
gtk_fill_layout_renderer_draw_trapezoid (PangoRenderer *renderer,
PangoRenderPart part,
double y1_,
double x11,
double x21,
double y2,
double x12,
double x22)
{
GtkFillLayoutRenderer *text_renderer = GTK_FILL_LAYOUT_RENDERER (renderer);
cairo_matrix_t matrix;
cairo_t *cr;
cr = text_renderer->cr;
cairo_save (cr);
/* use identity scale, but keep translation */
cairo_get_matrix (cr, &matrix);
matrix.xx = matrix.yy = 1;
matrix.xy = matrix.yx = 0;
cairo_set_matrix (cr, &matrix);
cairo_move_to (cr, x11, y1_);
cairo_line_to (cr, x21, y1_);
cairo_line_to (cr, x22, y2);
cairo_line_to (cr, x12, y2);
cairo_close_path (cr);
cairo_fill (cr);
cairo_restore (cr);
}
static void
gtk_fill_layout_renderer_draw_error_underline (PangoRenderer *renderer,
int x,
int y,
int width,
int height)
{
GtkFillLayoutRenderer *text_renderer = GTK_FILL_LAYOUT_RENDERER (renderer);
pango_cairo_show_error_underline (text_renderer->cr,
(double)x / PANGO_SCALE, (double)y / PANGO_SCALE,
(double)width / PANGO_SCALE, (double)height / PANGO_SCALE);
}
static void
gtk_fill_layout_renderer_draw_shape (PangoRenderer *renderer,
PangoAttrShape *attr,
int x,
int y)
{
GtkFillLayoutRenderer *text_renderer = GTK_FILL_LAYOUT_RENDERER (renderer);
cairo_t *cr = text_renderer->cr;
PangoLayout *layout;
PangoCairoShapeRendererFunc shape_renderer;
gpointer shape_renderer_data;
layout = pango_renderer_get_layout (renderer);
if (!layout)
return;
shape_renderer = pango_cairo_context_get_shape_renderer (pango_layout_get_context (layout),
&shape_renderer_data);
if (!shape_renderer)
return;
cairo_save (cr);
cairo_move_to (cr, (double)x / PANGO_SCALE, (double)y / PANGO_SCALE);
shape_renderer (cr, attr, FALSE, shape_renderer_data);
cairo_restore (cr);
}
static void
gtk_fill_layout_renderer_finalize (GObject *object)
{
G_OBJECT_CLASS (_gtk_fill_layout_renderer_parent_class)->finalize (object);
}
static void
_gtk_fill_layout_renderer_init (GtkFillLayoutRenderer *renderer)
{
}
static void
_gtk_fill_layout_renderer_class_init (GtkFillLayoutRendererClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
PangoRendererClass *renderer_class = PANGO_RENDERER_CLASS (klass);
renderer_class->draw_glyphs = gtk_fill_layout_renderer_draw_glyphs;
renderer_class->draw_glyph_item = gtk_fill_layout_renderer_draw_glyph_item;
renderer_class->draw_rectangle = gtk_fill_layout_renderer_draw_rectangle;
renderer_class->draw_trapezoid = gtk_fill_layout_renderer_draw_trapezoid;
renderer_class->draw_error_underline = gtk_fill_layout_renderer_draw_error_underline;
renderer_class->draw_shape = gtk_fill_layout_renderer_draw_shape;
object_class->finalize = gtk_fill_layout_renderer_finalize;
}
void
_gtk_pango_fill_layout (cairo_t *cr,
PangoLayout *layout)
{
static GtkFillLayoutRenderer *renderer = NULL;
gboolean has_current_point;
double current_x, current_y;
has_current_point = cairo_has_current_point (cr);
cairo_get_current_point (cr, &current_x, &current_y);
if (renderer == NULL)
renderer = g_object_new (GTK_TYPE_FILL_LAYOUT_RENDERER, NULL);
cairo_save (cr);
cairo_translate (cr, current_x, current_y);
renderer->cr = cr;
pango_renderer_draw_layout (PANGO_RENDERER (renderer), layout, 0, 0);
cairo_restore (cr);
if (has_current_point)
cairo_move_to (cr, current_x, current_y);
}
static AtkAttributeSet *
add_attribute (AtkAttributeSet *attributes,
AtkTextAttribute attr,
const gchar *value)
{
AtkAttribute *at;
at = g_new (AtkAttribute, 1);
at->name = g_strdup (atk_text_attribute_get_name (attr));
at->value = g_strdup (value);
return g_slist_prepend (attributes, at);
}
/*
* _gtk_pango_get_default_attributes:
* @attributes: a #AtkAttributeSet to add the attributes to
* @layout: the #PangoLayout from which to get attributes
*
* Adds the default text attributes from @layout to @attributes,
* after translating them from Pango attributes to ATK attributes.
*
* This is a convenience function that can be used to implement
* support for the #AtkText interface in widgets using Pango
* layouts.
*
* Returns: the modified @attributes
*/
AtkAttributeSet*
_gtk_pango_get_default_attributes (AtkAttributeSet *attributes,
PangoLayout *layout)
{
PangoContext *context;
gint i;
PangoWrapMode mode;
context = pango_layout_get_context (layout);
if (context)
{
PangoLanguage *language;
PangoFontDescription *font;
language = pango_context_get_language (context);
if (language)
attributes = add_attribute (attributes, ATK_TEXT_ATTR_LANGUAGE,
pango_language_to_string (language));
font = pango_context_get_font_description (context);
if (font)
{
gchar buf[60];
attributes = add_attribute (attributes, ATK_TEXT_ATTR_STYLE,
atk_text_attribute_get_value (ATK_TEXT_ATTR_STYLE,
pango_font_description_get_style (font)));
attributes = add_attribute (attributes, ATK_TEXT_ATTR_VARIANT,
atk_text_attribute_get_value (ATK_TEXT_ATTR_VARIANT,
pango_font_description_get_variant (font)));
attributes = add_attribute (attributes, ATK_TEXT_ATTR_STRETCH,
atk_text_attribute_get_value (ATK_TEXT_ATTR_STRETCH,
pango_font_description_get_stretch (font)));
attributes = add_attribute (attributes, ATK_TEXT_ATTR_FAMILY_NAME,
pango_font_description_get_family (font));
g_snprintf (buf, 60, "%d", pango_font_description_get_weight (font));
attributes = add_attribute (attributes, ATK_TEXT_ATTR_WEIGHT, buf);
g_snprintf (buf, 60, "%i", pango_font_description_get_size (font) / PANGO_SCALE);
attributes = add_attribute (attributes, ATK_TEXT_ATTR_SIZE, buf);
}
}
if (pango_layout_get_justify (layout))
{
i = 3;
}
else
{
PangoAlignment align;
align = pango_layout_get_alignment (layout);
if (align == PANGO_ALIGN_LEFT)
i = 0;
else if (align == PANGO_ALIGN_CENTER)
i = 2;
else /* PANGO_ALIGN_RIGHT */
i = 1;
}
attributes = add_attribute (attributes, ATK_TEXT_ATTR_JUSTIFICATION,
atk_text_attribute_get_value (ATK_TEXT_ATTR_JUSTIFICATION, i));
mode = pango_layout_get_wrap (layout);
if (mode == PANGO_WRAP_WORD)
i = 2;
else /* PANGO_WRAP_CHAR */
i = 1;
attributes = add_attribute (attributes, ATK_TEXT_ATTR_WRAP_MODE,
atk_text_attribute_get_value (ATK_TEXT_ATTR_WRAP_MODE, i));
attributes = add_attribute (attributes, ATK_TEXT_ATTR_STRIKETHROUGH,
atk_text_attribute_get_value (ATK_TEXT_ATTR_STRIKETHROUGH, 0));
attributes = add_attribute (attributes, ATK_TEXT_ATTR_UNDERLINE,
atk_text_attribute_get_value (ATK_TEXT_ATTR_UNDERLINE, 0));
attributes = add_attribute (attributes, ATK_TEXT_ATTR_RISE, "0");
attributes = add_attribute (attributes, ATK_TEXT_ATTR_SCALE, "1");
attributes = add_attribute (attributes, ATK_TEXT_ATTR_BG_FULL_HEIGHT, "0");
attributes = add_attribute (attributes, ATK_TEXT_ATTR_PIXELS_INSIDE_WRAP, "0");
attributes = add_attribute (attributes, ATK_TEXT_ATTR_PIXELS_BELOW_LINES, "0");
attributes = add_attribute (attributes, ATK_TEXT_ATTR_PIXELS_ABOVE_LINES, "0");
attributes = add_attribute (attributes, ATK_TEXT_ATTR_EDITABLE,
atk_text_attribute_get_value (ATK_TEXT_ATTR_EDITABLE, 0));
attributes = add_attribute (attributes, ATK_TEXT_ATTR_INVISIBLE,
atk_text_attribute_get_value (ATK_TEXT_ATTR_INVISIBLE, 0));
attributes = add_attribute (attributes, ATK_TEXT_ATTR_INDENT, "0");
attributes = add_attribute (attributes, ATK_TEXT_ATTR_RIGHT_MARGIN, "0");
attributes = add_attribute (attributes, ATK_TEXT_ATTR_LEFT_MARGIN, "0");
return attributes;
}
/*
* _gtk_pango_get_run_attributes:
* @attributes: a #AtkAttributeSet to add attributes to
* @layout: the #PangoLayout to get the attributes from
* @offset: the offset at which the attributes are wanted
* @start_offset: return location for the starting offset
* of the current run
* @end_offset: return location for the ending offset of the
* current run
*
* Finds the “run” around index (i.e. the maximal range of characters
* where the set of applicable attributes remains constant) and
* returns the starting and ending offsets for it.
*
* The attributes for the run are added to @attributes, after
* translating them from Pango attributes to ATK attributes.
*
* This is a convenience function that can be used to implement
* support for the #AtkText interface in widgets using Pango
* layouts.
*
* Returns: the modified #AtkAttributeSet
*/
AtkAttributeSet *
_gtk_pango_get_run_attributes (AtkAttributeSet *attributes,
PangoLayout *layout,
gint offset,
gint *start_offset,
gint *end_offset)
{
PangoAttrIterator *iter;
PangoAttrList *attr;
PangoAttrString *pango_string;
PangoAttrInt *pango_int;
PangoAttrColor *pango_color;
PangoAttrLanguage *pango_lang;
PangoAttrFloat *pango_float;
gint index, start_index, end_index;
gboolean is_next;
glong len;
const gchar *text;
gchar *value;
text = pango_layout_get_text (layout);
len = g_utf8_strlen (text, -1);
/* Grab the attributes of the PangoLayout, if any */
attr = pango_layout_get_attributes (layout);
if (attr == NULL)
{
*start_offset = 0;
*end_offset = len;
return attributes;
}
iter = pango_attr_list_get_iterator (attr);
/* Get invariant range offsets */
/* If offset out of range, set offset in range */
if (offset > len)
offset = len;
else if (offset < 0)
offset = 0;
index = g_utf8_offset_to_pointer (text, offset) - text;
pango_attr_iterator_range (iter, &start_index, &end_index);
is_next = TRUE;
while (is_next)
{
if (index >= start_index && index < end_index)
{
*start_offset = g_utf8_pointer_to_offset (text, text + start_index);
if (end_index == G_MAXINT) /* Last iterator */
end_index = len;
*end_offset = g_utf8_pointer_to_offset (text, text + end_index);
break;
}
is_next = pango_attr_iterator_next (iter);
pango_attr_iterator_range (iter, &start_index, &end_index);
}
/* Get attributes */
pango_string = (PangoAttrString*) pango_attr_iterator_get (iter, PANGO_ATTR_FAMILY);
if (pango_string != NULL)
{
value = g_strdup_printf ("%s", pango_string->value);
attributes = add_attribute (attributes, ATK_TEXT_ATTR_FAMILY_NAME, value);
g_free (value);
}
pango_int = (PangoAttrInt*) pango_attr_iterator_get (iter, PANGO_ATTR_STYLE);
if (pango_int != NULL)
{
attributes = add_attribute (attributes, ATK_TEXT_ATTR_STYLE,
atk_text_attribute_get_value (ATK_TEXT_ATTR_STYLE, pango_int->value));
}
pango_int = (PangoAttrInt*) pango_attr_iterator_get (iter, PANGO_ATTR_WEIGHT);
if (pango_int != NULL)
{
value = g_strdup_printf ("%i", pango_int->value);
attributes = add_attribute (attributes, ATK_TEXT_ATTR_WEIGHT, value);
g_free (value);
}
pango_int = (PangoAttrInt*) pango_attr_iterator_get (iter, PANGO_ATTR_VARIANT);
if (pango_int != NULL)
{
attributes = add_attribute (attributes, ATK_TEXT_ATTR_VARIANT,
atk_text_attribute_get_value (ATK_TEXT_ATTR_VARIANT, pango_int->value));
}
pango_int = (PangoAttrInt*) pango_attr_iterator_get (iter, PANGO_ATTR_STRETCH);
if (pango_int != NULL)
{
attributes = add_attribute (attributes, ATK_TEXT_ATTR_STRETCH,
atk_text_attribute_get_value (ATK_TEXT_ATTR_STRETCH, pango_int->value));
}
pango_int = (PangoAttrInt*) pango_attr_iterator_get (iter, PANGO_ATTR_SIZE);
if (pango_int != NULL)
{
value = g_strdup_printf ("%i", pango_int->value / PANGO_SCALE);
attributes = add_attribute (attributes, ATK_TEXT_ATTR_SIZE, value);
g_free (value);
}
pango_int = (PangoAttrInt*) pango_attr_iterator_get (iter, PANGO_ATTR_UNDERLINE);
if (pango_int != NULL)
{
attributes = add_attribute (attributes, ATK_TEXT_ATTR_UNDERLINE,
atk_text_attribute_get_value (ATK_TEXT_ATTR_UNDERLINE, pango_int->value));
}
pango_int = (PangoAttrInt*) pango_attr_iterator_get (iter, PANGO_ATTR_STRIKETHROUGH);
if (pango_int != NULL)
{
attributes = add_attribute (attributes, ATK_TEXT_ATTR_STRIKETHROUGH,
atk_text_attribute_get_value (ATK_TEXT_ATTR_STRIKETHROUGH, pango_int->value));
}
pango_int = (PangoAttrInt*) pango_attr_iterator_get (iter, PANGO_ATTR_RISE);
if (pango_int != NULL)
{
value = g_strdup_printf ("%i", pango_int->value);
attributes = add_attribute (attributes, ATK_TEXT_ATTR_RISE, value);
g_free (value);
}
pango_lang = (PangoAttrLanguage*) pango_attr_iterator_get (iter, PANGO_ATTR_LANGUAGE);
if (pango_lang != NULL)
{
attributes = add_attribute (attributes, ATK_TEXT_ATTR_LANGUAGE,
pango_language_to_string (pango_lang->value));
}
pango_float = (PangoAttrFloat*) pango_attr_iterator_get (iter, PANGO_ATTR_SCALE);
if (pango_float != NULL)
{
value = g_strdup_printf ("%g", pango_float->value);
attributes = add_attribute (attributes, ATK_TEXT_ATTR_SCALE, value);
g_free (value);
}
pango_color = (PangoAttrColor*) pango_attr_iterator_get (iter, PANGO_ATTR_FOREGROUND);
if (pango_color != NULL)
{
value = g_strdup_printf ("%u,%u,%u",
pango_color->color.red,
pango_color->color.green,
pango_color->color.blue);
attributes = add_attribute (attributes, ATK_TEXT_ATTR_FG_COLOR, value);
g_free (value);
}
pango_color = (PangoAttrColor*) pango_attr_iterator_get (iter, PANGO_ATTR_BACKGROUND);
if (pango_color != NULL)
{
value = g_strdup_printf ("%u,%u,%u",
pango_color->color.red,
pango_color->color.green,
pango_color->color.blue);
attributes = add_attribute (attributes, ATK_TEXT_ATTR_BG_COLOR, value);
g_free (value);
}
pango_attr_iterator_destroy (iter);
return attributes;
}
/*
* _gtk_pango_move_chars:
* @layout: a #PangoLayout
* @offset: a character offset in @layout
* @count: the number of characters to move from @offset
*
* Returns the position that is @count characters from the
* given @offset. @count may be positive or negative.
*
* For the purpose of this function, characters are defined
* by what Pango considers cursor positions.
*
* Returns: the new position
*/
static gint
_gtk_pango_move_chars (PangoLayout *layout,
gint offset,
gint count)
{
const PangoLogAttr *attrs;
gint n_attrs;
attrs = pango_layout_get_log_attrs_readonly (layout, &n_attrs);
while (count > 0 && offset < n_attrs - 1)
{
do
offset++;
while (offset < n_attrs - 1 && !attrs[offset].is_cursor_position);
count--;
}
while (count < 0 && offset > 0)
{
do
offset--;
while (offset > 0 && !attrs[offset].is_cursor_position);
count++;
}
return offset;
}
/*
* _gtk_pango_move_words:
* @layout: a #PangoLayout
* @offset: a character offset in @layout
* @count: the number of words to move from @offset
*
* Returns the position that is @count words from the
* given @offset. @count may be positive or negative.
*
* If @count is positive, the returned position will
* be a word end, otherwise it will be a word start.
* See the Pango documentation for details on how
* word starts and ends are defined.
*
* Returns: the new position
*/
static gint
_gtk_pango_move_words (PangoLayout *layout,
gint offset,
gint count)
{
const PangoLogAttr *attrs;
gint n_attrs;
attrs = pango_layout_get_log_attrs_readonly (layout, &n_attrs);
while (count > 0 && offset < n_attrs - 1)
{
do
offset++;
while (offset < n_attrs - 1 && !attrs[offset].is_word_end);
count--;
}
while (count < 0 && offset > 0)
{
do
offset--;
while (offset > 0 && !attrs[offset].is_word_start);
count++;
}
return offset;
}
/*
* _gtk_pango_move_sentences:
* @layout: a #PangoLayout
* @offset: a character offset in @layout
* @count: the number of sentences to move from @offset
*
* Returns the position that is @count sentences from the
* given @offset. @count may be positive or negative.
*
* If @count is positive, the returned position will
* be a sentence end, otherwise it will be a sentence start.
* See the Pango documentation for details on how
* sentence starts and ends are defined.
*
* Returns: the new position
*/
static gint
_gtk_pango_move_sentences (PangoLayout *layout,
gint offset,
gint count)
{
const PangoLogAttr *attrs;
gint n_attrs;
attrs = pango_layout_get_log_attrs_readonly (layout, &n_attrs);
while (count > 0 && offset < n_attrs - 1)
{
do
offset++;
while (offset < n_attrs - 1 && !attrs[offset].is_sentence_end);
count--;
}
while (count < 0 && offset > 0)
{
do
offset--;
while (offset > 0 && !attrs[offset].is_sentence_start);
count++;
}
return offset;
}
/*
* _gtk_pango_is_inside_word:
* @layout: a #PangoLayout
* @offset: a character offset in @layout
*
* Returns whether the given position is inside
* a word.
*
* Returns: %TRUE if @offset is inside a word
*/
static gboolean
_gtk_pango_is_inside_word (PangoLayout *layout,
gint offset)
{
const PangoLogAttr *attrs;
gint n_attrs;
attrs = pango_layout_get_log_attrs_readonly (layout, &n_attrs);
while (offset >= 0 &&
!(attrs[offset].is_word_start || attrs[offset].is_word_end))
offset--;
if (offset >= 0)
return attrs[offset].is_word_start;
return FALSE;
}
/*
* _gtk_pango_is_inside_sentence:
* @layout: a #PangoLayout
* @offset: a character offset in @layout
*
* Returns whether the given position is inside
* a sentence.
*
* Returns: %TRUE if @offset is inside a sentence
*/
static gboolean
_gtk_pango_is_inside_sentence (PangoLayout *layout,
gint offset)
{
const PangoLogAttr *attrs;
gint n_attrs;
attrs = pango_layout_get_log_attrs_readonly (layout, &n_attrs);
while (offset >= 0 &&
!(attrs[offset].is_sentence_start || attrs[offset].is_sentence_end))
offset--;
if (offset >= 0)
return attrs[offset].is_sentence_start;
return FALSE;
}
static void
pango_layout_get_line_before (PangoLayout *layout,
AtkTextBoundary boundary_type,
gint offset,
gint *start_offset,
gint *end_offset)
{
PangoLayoutIter *iter;
PangoLayoutLine *line, *prev_line = NULL, *prev_prev_line = NULL;
gint index, start_index, end_index;
const gchar *text;
gboolean found = FALSE;
text = pango_layout_get_text (layout);
index = g_utf8_offset_to_pointer (text, offset) - text;
iter = pango_layout_get_iter (layout);
do
{
line = pango_layout_iter_get_line (iter);
start_index = line->start_index;
end_index = start_index + line->length;
if (index >= start_index && index <= end_index)
{
/* Found line for offset */
if (prev_line)
{
switch (boundary_type)
{
case ATK_TEXT_BOUNDARY_LINE_START:
end_index = start_index;
start_index = prev_line->start_index;
break;
case ATK_TEXT_BOUNDARY_LINE_END:
if (prev_prev_line)
start_index = prev_prev_line->start_index + prev_prev_line->length;
else
start_index = 0;
end_index = prev_line->start_index + prev_line->length;
break;
case ATK_TEXT_BOUNDARY_CHAR:
case ATK_TEXT_BOUNDARY_WORD_START:
case ATK_TEXT_BOUNDARY_WORD_END:
case ATK_TEXT_BOUNDARY_SENTENCE_START:
case ATK_TEXT_BOUNDARY_SENTENCE_END:
default:
g_assert_not_reached();
break;
}
}
else
start_index = end_index = 0;
found = TRUE;
break;
}
prev_prev_line = prev_line;
prev_line = line;
}
while (pango_layout_iter_next_line (iter));
if (!found)
{
start_index = prev_line->start_index + prev_line->length;
end_index = start_index;
}
pango_layout_iter_free (iter);
*start_offset = g_utf8_pointer_to_offset (text, text + start_index);
*end_offset = g_utf8_pointer_to_offset (text, text + end_index);
}
static void
pango_layout_get_line_at (PangoLayout *layout,
AtkTextBoundary boundary_type,
gint offset,
gint *start_offset,
gint *end_offset)
{
PangoLayoutIter *iter;
PangoLayoutLine *line, *prev_line = NULL;
gint index, start_index, end_index;
const gchar *text;
gboolean found = FALSE;
text = pango_layout_get_text (layout);
index = g_utf8_offset_to_pointer (text, offset) - text;
iter = pango_layout_get_iter (layout);
do
{
line = pango_layout_iter_get_line (iter);
start_index = line->start_index;
end_index = start_index + line->length;
if (index >= start_index && index <= end_index)
{
/* Found line for offset */
switch (boundary_type)
{
case ATK_TEXT_BOUNDARY_LINE_START:
if (pango_layout_iter_next_line (iter))
end_index = pango_layout_iter_get_line (iter)->start_index;
break;
case ATK_TEXT_BOUNDARY_LINE_END:
if (prev_line)
start_index = prev_line->start_index + prev_line->length;
break;
case ATK_TEXT_BOUNDARY_CHAR:
case ATK_TEXT_BOUNDARY_WORD_START:
case ATK_TEXT_BOUNDARY_WORD_END:
case ATK_TEXT_BOUNDARY_SENTENCE_START:
case ATK_TEXT_BOUNDARY_SENTENCE_END:
default:
g_assert_not_reached();
break;
}
found = TRUE;
break;
}
prev_line = line;
}
while (pango_layout_iter_next_line (iter));
if (!found)
{
start_index = prev_line->start_index + prev_line->length;
end_index = start_index;
}
pango_layout_iter_free (iter);
*start_offset = g_utf8_pointer_to_offset (text, text + start_index);
*end_offset = g_utf8_pointer_to_offset (text, text + end_index);
}
static void
pango_layout_get_line_after (PangoLayout *layout,
AtkTextBoundary boundary_type,
gint offset,
gint *start_offset,
gint *end_offset)
{
PangoLayoutIter *iter;
PangoLayoutLine *line, *prev_line = NULL;
gint index, start_index, end_index;
const gchar *text;
gboolean found = FALSE;
text = pango_layout_get_text (layout);
index = g_utf8_offset_to_pointer (text, offset) - text;
iter = pango_layout_get_iter (layout);
do
{
line = pango_layout_iter_get_line (iter);
start_index = line->start_index;
end_index = start_index + line->length;
if (index >= start_index && index <= end_index)
{
/* Found line for offset */
if (pango_layout_iter_next_line (iter))
{
line = pango_layout_iter_get_line (iter);
switch (boundary_type)
{
case ATK_TEXT_BOUNDARY_LINE_START:
start_index = line->start_index;
if (pango_layout_iter_next_line (iter))
end_index = pango_layout_iter_get_line (iter)->start_index;
else
end_index = start_index + line->length;
break;
case ATK_TEXT_BOUNDARY_LINE_END:
start_index = end_index;
end_index = line->start_index + line->length;
break;
case ATK_TEXT_BOUNDARY_CHAR:
case ATK_TEXT_BOUNDARY_WORD_START:
case ATK_TEXT_BOUNDARY_WORD_END:
case ATK_TEXT_BOUNDARY_SENTENCE_START:
case ATK_TEXT_BOUNDARY_SENTENCE_END:
default:
g_assert_not_reached();
break;
}
}
else
start_index = end_index;
found = TRUE;
break;
}
prev_line = line;
}
while (pango_layout_iter_next_line (iter));
if (!found)
{
start_index = prev_line->start_index + prev_line->length;
end_index = start_index;
}
pango_layout_iter_free (iter);
*start_offset = g_utf8_pointer_to_offset (text, text + start_index);
*end_offset = g_utf8_pointer_to_offset (text, text + end_index);
}
/*
* _gtk_pango_get_text_before:
* @layout: a #PangoLayout
* @boundary_type: a #AtkTextBoundary
* @offset: a character offset in @layout
* @start_offset: return location for the start of the returned text
* @end_offset: return location for the end of the return text
*
* Gets a slice of the text from @layout before @offset.
*
* The @boundary_type determines the size of the returned slice of
* text. For the exact semantics of this function, see
* atk_text_get_text_before_offset().
*
* Returns: a newly allocated string containing a slice of text
* from layout. Free with g_free().
*/
gchar *
_gtk_pango_get_text_before (PangoLayout *layout,
AtkTextBoundary boundary_type,
gint offset,
gint *start_offset,
gint *end_offset)
{
const gchar *text;
gint start, end;
const PangoLogAttr *attrs;
gint n_attrs;
text = pango_layout_get_text (layout);
if (text[0] == 0)
{
*start_offset = 0;
*end_offset = 0;
return g_strdup ("");
}
attrs = pango_layout_get_log_attrs_readonly (layout, &n_attrs);
start = offset;
end = start;
switch (boundary_type)
{
case ATK_TEXT_BOUNDARY_CHAR:
start = _gtk_pango_move_chars (layout, start, -1);
break;
case ATK_TEXT_BOUNDARY_WORD_START:
if (!attrs[start].is_word_start)
start = _gtk_pango_move_words (layout, start, -1);
end = start;
start = _gtk_pango_move_words (layout, start, -1);
break;
case ATK_TEXT_BOUNDARY_WORD_END:
if (_gtk_pango_is_inside_word (layout, start) &&
!attrs[start].is_word_start)
start = _gtk_pango_move_words (layout, start, -1);
while (!attrs[start].is_word_end && start > 0)
start = _gtk_pango_move_chars (layout, start, -1);
end = start;
start = _gtk_pango_move_words (layout, start, -1);
while (!attrs[start].is_word_end && start > 0)
start = _gtk_pango_move_chars (layout, start, -1);
break;
case ATK_TEXT_BOUNDARY_SENTENCE_START:
if (!attrs[start].is_sentence_start)
start = _gtk_pango_move_sentences (layout, start, -1);
end = start;
start = _gtk_pango_move_sentences (layout, start, -1);
break;
case ATK_TEXT_BOUNDARY_SENTENCE_END:
if (_gtk_pango_is_inside_sentence (layout, start) &&
!attrs[start].is_sentence_start)
start = _gtk_pango_move_sentences (layout, start, -1);
while (!attrs[start].is_sentence_end && start > 0)
start = _gtk_pango_move_chars (layout, start, -1);
end = start;
start = _gtk_pango_move_sentences (layout, start, -1);
while (!attrs[start].is_sentence_end && start > 0)
start = _gtk_pango_move_chars (layout, start, -1);
break;
case ATK_TEXT_BOUNDARY_LINE_START:
case ATK_TEXT_BOUNDARY_LINE_END:
pango_layout_get_line_before (layout, boundary_type, offset, &start, &end);
break;
default:
g_assert_not_reached ();
break;
}
*start_offset = start;
*end_offset = end;
g_assert (start <= end);
return g_utf8_substring (text, start, end);
}
/*
* _gtk_pango_get_text_after:
* @layout: a #PangoLayout
* @boundary_type: a #AtkTextBoundary
* @offset: a character offset in @layout
* @start_offset: return location for the start of the returned text
* @end_offset: return location for the end of the return text
*
* Gets a slice of the text from @layout after @offset.
*
* The @boundary_type determines the size of the returned slice of
* text. For the exact semantics of this function, see
* atk_text_get_text_after_offset().
*
* Returns: a newly allocated string containing a slice of text
* from layout. Free with g_free().
*/
gchar *
_gtk_pango_get_text_after (PangoLayout *layout,
AtkTextBoundary boundary_type,
gint offset,
gint *start_offset,
gint *end_offset)
{
const gchar *text;
gint start, end;
const PangoLogAttr *attrs;
gint n_attrs;
text = pango_layout_get_text (layout);
if (text[0] == 0)
{
*start_offset = 0;
*end_offset = 0;
return g_strdup ("");
}
attrs = pango_layout_get_log_attrs_readonly (layout, &n_attrs);
start = offset;
end = start;
switch (boundary_type)
{
case ATK_TEXT_BOUNDARY_CHAR:
start = _gtk_pango_move_chars (layout, start, 1);
end = start;
end = _gtk_pango_move_chars (layout, end, 1);
break;
case ATK_TEXT_BOUNDARY_WORD_START:
if (_gtk_pango_is_inside_word (layout, end))
end = _gtk_pango_move_words (layout, end, 1);
while (!attrs[end].is_word_start && end < n_attrs - 1)
end = _gtk_pango_move_chars (layout, end, 1);
start = end;
if (end < n_attrs - 1)
{
end = _gtk_pango_move_words (layout, end, 1);
while (!attrs[end].is_word_start && end < n_attrs - 1)
end = _gtk_pango_move_chars (layout, end, 1);
}
break;
case ATK_TEXT_BOUNDARY_WORD_END:
end = _gtk_pango_move_words (layout, end, 1);
start = end;
if (end < n_attrs - 1)
end = _gtk_pango_move_words (layout, end, 1);
break;
case ATK_TEXT_BOUNDARY_SENTENCE_START:
if (_gtk_pango_is_inside_sentence (layout, end))
end = _gtk_pango_move_sentences (layout, end, 1);
while (!attrs[end].is_sentence_start && end < n_attrs - 1)
end = _gtk_pango_move_chars (layout, end, 1);
start = end;
if (end < n_attrs - 1)
{
end = _gtk_pango_move_sentences (layout, end, 1);
while (!attrs[end].is_sentence_start && end < n_attrs - 1)
end = _gtk_pango_move_chars (layout, end, 1);
}
break;
case ATK_TEXT_BOUNDARY_SENTENCE_END:
end = _gtk_pango_move_sentences (layout, end, 1);
start = end;
if (end < n_attrs - 1)
end = _gtk_pango_move_sentences (layout, end, 1);
break;
case ATK_TEXT_BOUNDARY_LINE_START:
case ATK_TEXT_BOUNDARY_LINE_END:
pango_layout_get_line_after (layout, boundary_type, offset, &start, &end);
break;
default:
g_assert_not_reached ();
break;
}
*start_offset = start;
*end_offset = end;
g_assert (start <= end);
return g_utf8_substring (text, start, end);
}
/*
* _gtk_pango_get_text_at:
* @layout: a #PangoLayout
* @boundary_type: a #AtkTextBoundary
* @offset: a character offset in @layout
* @start_offset: return location for the start of the returned text
* @end_offset: return location for the end of the return text
*
* Gets a slice of the text from @layout at @offset.
*
* The @boundary_type determines the size of the returned slice of
* text. For the exact semantics of this function, see
* atk_text_get_text_after_offset().
*
* Returns: a newly allocated string containing a slice of text
* from layout. Free with g_free().
*/
gchar *
_gtk_pango_get_text_at (PangoLayout *layout,
AtkTextBoundary boundary_type,
gint offset,
gint *start_offset,
gint *end_offset)
{
const gchar *text;
gint start, end;
const PangoLogAttr *attrs;
gint n_attrs;
text = pango_layout_get_text (layout);
if (text[0] == 0)
{
*start_offset = 0;
*end_offset = 0;
return g_strdup ("");
}
attrs = pango_layout_get_log_attrs_readonly (layout, &n_attrs);
start = offset;
end = start;
switch (boundary_type)
{
case ATK_TEXT_BOUNDARY_CHAR:
end = _gtk_pango_move_chars (layout, end, 1);
break;
case ATK_TEXT_BOUNDARY_WORD_START:
if (!attrs[start].is_word_start)
start = _gtk_pango_move_words (layout, start, -1);
if (_gtk_pango_is_inside_word (layout, end))
end = _gtk_pango_move_words (layout, end, 1);
while (!attrs[end].is_word_start && end < n_attrs - 1)
end = _gtk_pango_move_chars (layout, end, 1);
break;
case ATK_TEXT_BOUNDARY_WORD_END:
if (_gtk_pango_is_inside_word (layout, start) &&
!attrs[start].is_word_start)
start = _gtk_pango_move_words (layout, start, -1);
while (!attrs[start].is_word_end && start > 0)
start = _gtk_pango_move_chars (layout, start, -1);
end = _gtk_pango_move_words (layout, end, 1);
break;
case ATK_TEXT_BOUNDARY_SENTENCE_START:
if (!attrs[start].is_sentence_start)
start = _gtk_pango_move_sentences (layout, start, -1);
if (_gtk_pango_is_inside_sentence (layout, end))
end = _gtk_pango_move_sentences (layout, end, 1);
while (!attrs[end].is_sentence_start && end < n_attrs - 1)
end = _gtk_pango_move_chars (layout, end, 1);
break;
case ATK_TEXT_BOUNDARY_SENTENCE_END:
if (_gtk_pango_is_inside_sentence (layout, start) &&
!attrs[start].is_sentence_start)
start = _gtk_pango_move_sentences (layout, start, -1);
while (!attrs[start].is_sentence_end && start > 0)
start = _gtk_pango_move_chars (layout, start, -1);
end = _gtk_pango_move_sentences (layout, end, 1);
break;
case ATK_TEXT_BOUNDARY_LINE_START:
case ATK_TEXT_BOUNDARY_LINE_END:
pango_layout_get_line_at (layout, boundary_type, offset, &start, &end);
break;
default:
g_assert_not_reached ();
break;
}
*start_offset = start;
*end_offset = end;
g_assert (start <= end);
return g_utf8_substring (text, start, end);
}
static gboolean
attr_list_merge_filter (PangoAttribute *attribute,
gpointer list)
{
pango_attr_list_change (list, pango_attribute_copy (attribute));
return FALSE;
}
/*
* _gtk_pango_attr_list_merge:
* @into: a #PangoAttrList where attributes are merged or %NULL
* @from: a #PangoAttrList with the attributes to merge or %NULL
*
* Merges attributes from @from into @into.
*
* Returns: the merged list.
*/
PangoAttrList *
_gtk_pango_attr_list_merge (PangoAttrList *into,
PangoAttrList *from)
{
if (from)
{
if (into)
pango_attr_list_filter (from, attr_list_merge_filter, into);
else
return pango_attr_list_ref (from);
}
return into;
}
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