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gtk2/gtk/gtktextdisplay.c
Benjamin Otte fea39c078b textview: Make the PangoRenderer use Cairo exclusively 
No more gdkpango usage, no more GdkGC required, yay!
2010-08-10 21:02:29 +02:00

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/* gtktextdisplay.c - display layed-out text
*
* Copyright (c) 1992-1994 The Regents of the University of California.
* Copyright (c) 1994-1997 Sun Microsystems, Inc.
* Copyright (c) 2000 Red Hat, Inc.
* Tk->Gtk port by Havoc Pennington
*
* This file can be used under your choice of two licenses, the LGPL
* and the original Tk license.
*
* LGPL:
*
* 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, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* Original Tk license:
*
* This software is copyrighted by the Regents of the University of
* California, Sun Microsystems, Inc., and other parties. The
* following terms apply to all files associated with the software
* unless explicitly disclaimed in individual files.
*
* The authors hereby grant permission to use, copy, modify,
* distribute, and license this software and its documentation for any
* purpose, provided that existing copyright notices are retained in
* all copies and that this notice is included verbatim in any
* distributions. No written agreement, license, or royalty fee is
* required for any of the authorized uses. Modifications to this
* software may be copyrighted by their authors and need not follow
* the licensing terms described here, provided that the new terms are
* clearly indicated on the first page of each file where they apply.
*
* IN NO EVENT SHALL THE AUTHORS OR DISTRIBUTORS BE LIABLE TO ANY
* PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL
* DAMAGES ARISING OUT OF THE USE OF THIS SOFTWARE, ITS DOCUMENTATION,
* OR ANY DERIVATIVES THEREOF, EVEN IF THE AUTHORS HAVE BEEN ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*
* THE AUTHORS AND DISTRIBUTORS SPECIFICALLY DISCLAIM ANY WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND
* NON-INFRINGEMENT. THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS,
* AND THE AUTHORS AND DISTRIBUTORS HAVE NO OBLIGATION TO PROVIDE
* MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*
* GOVERNMENT USE: If you are acquiring this software on behalf of the
* U.S. government, the Government shall have only "Restricted Rights"
* in the software and related documentation as defined in the Federal
* Acquisition Regulations (FARs) in Clause 52.227.19 (c) (2). If you
* are acquiring the software on behalf of the Department of Defense,
* the software shall be classified as "Commercial Computer Software"
* and the Government shall have only "Restricted Rights" as defined
* in Clause 252.227-7013 (c) (1) of DFARs. Notwithstanding the
* foregoing, the authors grant the U.S. Government and others acting
* in its behalf permission to use and distribute the software in
* accordance with the terms specified in this license.
*
*/
/*
* 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/.
*/
#define GTK_TEXT_USE_INTERNAL_UNSUPPORTED_API
#include "config.h"
#include "gtktextdisplay.h"
#include "gtkintl.h"
/* DO NOT go putting private headers in here. This file should only
* use the semi-public headers, as with gtktextview.c.
*/
#define GTK_TYPE_TEXT_RENDERER (_gtk_text_renderer_get_type())
#define GTK_TEXT_RENDERER(object) (G_TYPE_CHECK_INSTANCE_CAST ((object), GTK_TYPE_TEXT_RENDERER, GtkTextRenderer))
#define GTK_IS_TEXT_RENDERER(object) (G_TYPE_CHECK_INSTANCE_TYPE ((object), GTK_TYPE_TEXT_RENDERER))
#define GTK_TEXT_RENDERER_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GTK_TYPE_TEXT_RENDERER, GtkTextRendererClass))
#define GTK_IS_TEXT_RENDERER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GTK_TYPE_TEXT_RENDERER))
#define GTK_TEXT_RENDERER_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GTK_TYPE_TEXT_RENDERER, GtkTextRendererClass))
typedef struct _GtkTextRenderer GtkTextRenderer;
typedef struct _GtkTextRendererClass GtkTextRendererClass;
enum {
NORMAL,
SELECTED,
CURSOR
};
struct _GtkTextRenderer
{
PangoRenderer parent_instance;
GtkWidget *widget;
cairo_t *cr;
GdkColor *error_color; /* Error underline color for this widget */
GList *widgets; /* widgets encountered when drawing */
int state;
};
struct _GtkTextRendererClass
{
PangoRendererClass parent_class;
};
G_DEFINE_TYPE (GtkTextRenderer, _gtk_text_renderer, PANGO_TYPE_RENDERER)
static GdkColor *
text_renderer_get_error_color (GtkTextRenderer *text_renderer)
{
static const GdkColor red = { 0, 0xffff, 0, 0 };
if (!text_renderer->error_color)
gtk_widget_style_get (text_renderer->widget,
"error-underline-color", &text_renderer->error_color,
NULL);
if (!text_renderer->error_color)
text_renderer->error_color = gdk_color_copy (&red);
return text_renderer->error_color;
}
static void
text_renderer_set_gdk_color (GtkTextRenderer *text_renderer,
PangoRenderPart part,
GdkColor *gdk_color)
{
PangoRenderer *renderer = PANGO_RENDERER (text_renderer);
if (gdk_color)
{
PangoColor color;
color.red = gdk_color->red;
color.green = gdk_color->green;
color.blue = gdk_color->blue;
pango_renderer_set_color (renderer, part, &color);
}
else
pango_renderer_set_color (renderer, part, NULL);
}
static GtkTextAppearance *
get_item_appearance (PangoItem *item)
{
GSList *tmp_list = item->analysis.extra_attrs;
while (tmp_list)
{
PangoAttribute *attr = tmp_list->data;
if (attr->klass->type == gtk_text_attr_appearance_type)
return &((GtkTextAttrAppearance *)attr)->appearance;
tmp_list = tmp_list->next;
}
return NULL;
}
static void
gtk_text_renderer_prepare_run (PangoRenderer *renderer,
PangoLayoutRun *run)
{
GtkTextRenderer *text_renderer = GTK_TEXT_RENDERER (renderer);
GdkColor *bg_color, *fg_color, *underline_color;
GtkTextAppearance *appearance;
PANGO_RENDERER_CLASS (_gtk_text_renderer_parent_class)->prepare_run (renderer, run);
appearance = get_item_appearance (run->item);
g_assert (appearance != NULL);
if (appearance->draw_bg && text_renderer->state == NORMAL)
bg_color = &appearance->bg_color;
else
bg_color = NULL;
text_renderer_set_gdk_color (text_renderer, PANGO_RENDER_PART_BACKGROUND, bg_color);
if (text_renderer->state == SELECTED)
{
if (gtk_widget_has_focus (text_renderer->widget))
fg_color = &text_renderer->widget->style->text[GTK_STATE_SELECTED];
else
fg_color = &text_renderer->widget->style->text[GTK_STATE_ACTIVE];
}
else if (text_renderer->state == CURSOR && gtk_widget_has_focus (text_renderer->widget))
fg_color = &text_renderer->widget->style->base[GTK_STATE_NORMAL];
else
fg_color = &appearance->fg_color;
text_renderer_set_gdk_color (text_renderer, PANGO_RENDER_PART_FOREGROUND, fg_color);
text_renderer_set_gdk_color (text_renderer, PANGO_RENDER_PART_STRIKETHROUGH, fg_color);
if (appearance->underline == PANGO_UNDERLINE_ERROR)
underline_color = text_renderer_get_error_color (text_renderer);
else
underline_color = fg_color;
text_renderer_set_gdk_color (text_renderer, PANGO_RENDER_PART_UNDERLINE, underline_color);
}
static void
set_color (GtkTextRenderer *text_renderer,
PangoRenderPart part)
{
PangoColor *color;
cairo_save (text_renderer->cr);
color = pango_renderer_get_color (PANGO_RENDERER (text_renderer), part);
if (color)
cairo_set_source_rgb (text_renderer->cr,
color->red / 65535.,
color->green / 65535.,
color->blue / 65535.);
}
static void
unset_color (GtkTextRenderer *text_renderer)
{
cairo_restore (text_renderer->cr);
}
static void
gtk_text_renderer_draw_glyphs (PangoRenderer *renderer,
PangoFont *font,
PangoGlyphString *glyphs,
int x,
int y)
{
GtkTextRenderer *text_renderer = GTK_TEXT_RENDERER (renderer);
set_color (text_renderer, PANGO_RENDER_PART_FOREGROUND);
cairo_move_to (text_renderer->cr, (double)x / PANGO_SCALE, (double)y / PANGO_SCALE);
pango_cairo_show_glyph_string (text_renderer->cr, font, glyphs);
unset_color (text_renderer);
}
static void
gtk_text_renderer_draw_glyph_item (PangoRenderer *renderer,
const char *text,
PangoGlyphItem *glyph_item,
int x,
int y)
{
GtkTextRenderer *text_renderer = GTK_TEXT_RENDERER (renderer);
set_color (text_renderer, PANGO_RENDER_PART_FOREGROUND);
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);
unset_color (text_renderer);
}
static void
gtk_text_renderer_draw_rectangle (PangoRenderer *renderer,
PangoRenderPart part,
int x,
int y,
int width,
int height)
{
GtkTextRenderer *text_renderer = GTK_TEXT_RENDERER (renderer);
set_color (text_renderer, part);
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);
unset_color (text_renderer);
}
static void
gtk_text_renderer_draw_trapezoid (PangoRenderer *renderer,
PangoRenderPart part,
double y1_,
double x11,
double x21,
double y2,
double x12,
double x22)
{
GtkTextRenderer *text_renderer = GTK_TEXT_RENDERER (renderer);
cairo_t *cr;
cairo_matrix_t matrix;
set_color (text_renderer, part);
cr = text_renderer->cr;
cairo_get_matrix (cr, &matrix);
matrix.xx = matrix.yy = 1.0;
matrix.xy = matrix.yx = 0.0;
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);
unset_color (text_renderer);
}
static void
gtk_text_renderer_draw_error_underline (PangoRenderer *renderer,
int x,
int y,
int width,
int height)
{
GtkTextRenderer *text_renderer = GTK_TEXT_RENDERER (renderer);
set_color (text_renderer, PANGO_RENDER_PART_UNDERLINE);
pango_cairo_show_error_underline (text_renderer->cr,
(double)x / PANGO_SCALE, (double)y / PANGO_SCALE,
(double)width / PANGO_SCALE, (double)height / PANGO_SCALE);
unset_color (text_renderer);
}
static void
gtk_text_renderer_draw_shape (PangoRenderer *renderer,
PangoAttrShape *attr,
int x,
int y)
{
GtkTextRenderer *text_renderer = GTK_TEXT_RENDERER (renderer);
GdkColor *fg;
if (text_renderer->state == SELECTED)
{
if (gtk_widget_has_focus (text_renderer->widget))
fg = &text_renderer->widget->style->text[GTK_STATE_SELECTED];
else
fg = &text_renderer->widget->style->text[GTK_STATE_SELECTED];
}
else if (text_renderer->state == CURSOR && gtk_widget_has_focus (text_renderer->widget))
fg = &text_renderer->widget->style->base[GTK_STATE_NORMAL];
else
fg = &text_renderer->widget->style->text[GTK_STATE_NORMAL];
if (attr->data == NULL)
{
/* This happens if we have an empty widget anchor. Draw
* something empty-looking.
*/
GdkRectangle shape_rect;
cairo_t *cr;
shape_rect.x = PANGO_PIXELS (x);
shape_rect.y = PANGO_PIXELS (y + attr->logical_rect.y);
shape_rect.width = PANGO_PIXELS (x + attr->logical_rect.width) - shape_rect.x;
shape_rect.height = PANGO_PIXELS (y + attr->logical_rect.y + attr->logical_rect.height) - shape_rect.y;
cr = text_renderer->cr;
cairo_save (cr);
cairo_set_line_width (cr, 1.0);
gdk_cairo_set_source_color (cr, fg);
cairo_rectangle (cr,
shape_rect.x + 0.5, shape_rect.y + 0.5,
shape_rect.width - 1, shape_rect.height - 1);
cairo_move_to (cr, shape_rect.x + 0.5, shape_rect.y + 0.5);
cairo_line_to (cr,
shape_rect.x + shape_rect.width - 0.5,
shape_rect.y + shape_rect.height - 0.5);
cairo_move_to (cr, shape_rect.x + 0.5,
shape_rect.y + shape_rect.height - 0.5);
cairo_line_to (cr, shape_rect.x + shape_rect.width - 0.5,
shape_rect.y + 0.5);
cairo_stroke (cr);
cairo_restore (cr);
}
else if (GDK_IS_PIXBUF (attr->data))
{
cairo_t *cr = text_renderer->cr;
gint width, height;
GdkRectangle pixbuf_rect, draw_rect;
GdkPixbuf *pixbuf;
pixbuf = GDK_PIXBUF (attr->data);
width = gdk_pixbuf_get_width (pixbuf);
height = gdk_pixbuf_get_height (pixbuf);
pixbuf_rect.x = PANGO_PIXELS (x);
pixbuf_rect.y = PANGO_PIXELS (y) - height;
pixbuf_rect.width = width;
pixbuf_rect.height = height;
cairo_save (cr);
gdk_cairo_set_source_pixbuf (cr, pixbuf, pixbuf_rect.x, pixbuf_rect.y);
gdk_cairo_rectangle (cr, &draw_rect);
cairo_fill (cr);
cairo_restore (cr);
}
else if (GTK_IS_WIDGET (attr->data))
{
GtkWidget *widget;
widget = GTK_WIDGET (attr->data);
text_renderer->widgets = g_list_prepend (text_renderer->widgets,
g_object_ref (widget));
}
else
g_assert_not_reached (); /* not a pixbuf or widget */
}
static void
gtk_text_renderer_finalize (GObject *object)
{
G_OBJECT_CLASS (_gtk_text_renderer_parent_class)->finalize (object);
}
static void
_gtk_text_renderer_init (GtkTextRenderer *renderer)
{
}
static void
_gtk_text_renderer_class_init (GtkTextRendererClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
PangoRendererClass *renderer_class = PANGO_RENDERER_CLASS (klass);
renderer_class->prepare_run = gtk_text_renderer_prepare_run;
renderer_class->draw_glyphs = gtk_text_renderer_draw_glyphs;
renderer_class->draw_glyph_item = gtk_text_renderer_draw_glyph_item;
renderer_class->draw_rectangle = gtk_text_renderer_draw_rectangle;
renderer_class->draw_trapezoid = gtk_text_renderer_draw_trapezoid;
renderer_class->draw_error_underline = gtk_text_renderer_draw_error_underline;
renderer_class->draw_shape = gtk_text_renderer_draw_shape;
object_class->finalize = gtk_text_renderer_finalize;
}
static void
text_renderer_set_state (GtkTextRenderer *text_renderer,
int state)
{
text_renderer->state = state;
}
static void
text_renderer_begin (GtkTextRenderer *text_renderer,
GtkWidget *widget,
cairo_t *cr)
{
text_renderer->widget = widget;
text_renderer->cr = cr;
}
/* Returns a GSList of (referenced) widgets encountered while drawing.
*/
static GList *
text_renderer_end (GtkTextRenderer *text_renderer)
{
GList *widgets = text_renderer->widgets;
text_renderer->widget = NULL;
text_renderer->cr = NULL;
text_renderer->widgets = NULL;
if (text_renderer->error_color)
{
gdk_color_free (text_renderer->error_color);
text_renderer->error_color = NULL;
}
return widgets;
}
static cairo_region_t *
get_selected_clip (GtkTextRenderer *text_renderer,
PangoLayout *layout,
PangoLayoutLine *line,
int x,
int y,
int height,
int start_index,
int end_index)
{
gint *ranges;
gint n_ranges, i;
cairo_region_t *clip_region = cairo_region_create ();
pango_layout_line_get_x_ranges (line, start_index, end_index, &ranges, &n_ranges);
for (i=0; i < n_ranges; i++)
{
GdkRectangle rect;
rect.x = x + PANGO_PIXELS (ranges[2*i]);
rect.y = y;
rect.width = PANGO_PIXELS (ranges[2*i + 1]) - PANGO_PIXELS (ranges[2*i]);
rect.height = height;
cairo_region_union_rectangle (clip_region, &rect);
}
g_free (ranges);
return clip_region;
}
static void
render_para (GtkTextRenderer *text_renderer,
GtkTextLineDisplay *line_display,
/* Top-left corner of paragraph including all margins */
int x,
int y,
int selection_start_index,
int selection_end_index)
{
PangoLayout *layout = line_display->layout;
int byte_offset = 0;
PangoLayoutIter *iter;
PangoRectangle layout_logical;
int screen_width;
GdkColor *selection;
gint state;
gboolean first = TRUE;
iter = pango_layout_get_iter (layout);
pango_layout_iter_get_layout_extents (iter, NULL, &layout_logical);
/* Adjust for margins */
layout_logical.x += line_display->x_offset * PANGO_SCALE;
layout_logical.y += line_display->top_margin * PANGO_SCALE;
screen_width = line_display->total_width;
if (gtk_widget_has_focus (text_renderer->widget))
state = GTK_STATE_SELECTED;
else
state = GTK_STATE_ACTIVE;
selection = &text_renderer->widget->style->base [state];
do
{
PangoLayoutLine *line = pango_layout_iter_get_line_readonly (iter);
int selection_y, selection_height;
int first_y, last_y;
PangoRectangle line_rect;
int baseline;
gboolean at_last_line;
pango_layout_iter_get_line_extents (iter, NULL, &line_rect);
baseline = pango_layout_iter_get_baseline (iter);
pango_layout_iter_get_line_yrange (iter, &first_y, &last_y);
/* Adjust for margins */
line_rect.x += line_display->x_offset * PANGO_SCALE;
line_rect.y += line_display->top_margin * PANGO_SCALE;
baseline += line_display->top_margin * PANGO_SCALE;
/* Selection is the height of the line, plus top/bottom
* margin if we're the first/last line
*/
selection_y = y + PANGO_PIXELS (first_y) + line_display->top_margin;
selection_height = PANGO_PIXELS (last_y) - PANGO_PIXELS (first_y);
if (first)
{
selection_y -= line_display->top_margin;
selection_height += line_display->top_margin;
}
at_last_line = pango_layout_iter_at_last_line (iter);
if (at_last_line)
selection_height += line_display->bottom_margin;
first = FALSE;
if (selection_start_index < byte_offset &&
selection_end_index > line->length + byte_offset) /* All selected */
{
cairo_t *cr = text_renderer->cr;
cairo_save (cr);
gdk_cairo_set_source_color (cr, selection);
cairo_rectangle (cr,
x + line_display->left_margin, selection_y,
screen_width, selection_height);
cairo_fill (cr);
cairo_restore(cr);
text_renderer_set_state (text_renderer, SELECTED);
pango_renderer_draw_layout_line (PANGO_RENDERER (text_renderer),
line,
PANGO_SCALE * x + line_rect.x,
PANGO_SCALE * y + baseline);
}
else
{
if (line_display->pg_bg_color)
{
cairo_t *cr = text_renderer->cr;
cairo_save (cr);
gdk_cairo_set_source_color (cr, line_display->pg_bg_color);
cairo_rectangle (cr,
x + line_display->left_margin, selection_y,
screen_width, selection_height);
cairo_fill (cr);
cairo_restore (cr);
}
text_renderer_set_state (text_renderer, NORMAL);
pango_renderer_draw_layout_line (PANGO_RENDERER (text_renderer),
line,
PANGO_SCALE * x + line_rect.x,
PANGO_SCALE * y + baseline);
/* Check if some part of the line is selected; the newline
* that is after line->length for the last line of the
* paragraph counts as part of the line for this
*/
if ((selection_start_index < byte_offset + line->length ||
(selection_start_index == byte_offset + line->length && pango_layout_iter_at_last_line (iter))) &&
selection_end_index > byte_offset)
{
cairo_t *cr = text_renderer->cr;
cairo_region_t *clip_region = get_selected_clip (text_renderer, layout, line,
x + line_display->x_offset,
selection_y,
selection_height,
selection_start_index, selection_end_index);
cairo_save (cr);
gdk_cairo_region (cr, clip_region);
cairo_clip (cr);
cairo_region_destroy (clip_region);
gdk_cairo_set_source_color (cr, selection);
cairo_rectangle (cr,
x + PANGO_PIXELS (line_rect.x),
selection_y,
PANGO_PIXELS (line_rect.width),
selection_height);
cairo_fill (cr);
text_renderer_set_state (text_renderer, SELECTED);
pango_renderer_draw_layout_line (PANGO_RENDERER (text_renderer),
line,
PANGO_SCALE * x + line_rect.x,
PANGO_SCALE * y + baseline);
cairo_restore (cr);
/* Paint in the ends of the line */
if (line_rect.x > line_display->left_margin * PANGO_SCALE &&
((line_display->direction == GTK_TEXT_DIR_LTR && selection_start_index < byte_offset) ||
(line_display->direction == GTK_TEXT_DIR_RTL && selection_end_index > byte_offset + line->length)))
{
cairo_save (cr);
gdk_cairo_set_source_color (cr, selection);
cairo_rectangle (cr,
x + line_display->left_margin,
selection_y,
PANGO_PIXELS (line_rect.x) - line_display->left_margin,
selection_height);
cairo_fill (cr);
cairo_restore (cr);
}
if (line_rect.x + line_rect.width <
(screen_width + line_display->left_margin) * PANGO_SCALE &&
((line_display->direction == GTK_TEXT_DIR_LTR && selection_end_index > byte_offset + line->length) ||
(line_display->direction == GTK_TEXT_DIR_RTL && selection_start_index < byte_offset)))
{
int nonlayout_width;
nonlayout_width =
line_display->left_margin + screen_width -
PANGO_PIXELS (line_rect.x) - PANGO_PIXELS (line_rect.width);
cairo_save (cr);
gdk_cairo_set_source_color (cr, selection);
cairo_rectangle (cr,
x + PANGO_PIXELS (line_rect.x) + PANGO_PIXELS (line_rect.width),
selection_y,
nonlayout_width,
selection_height);
cairo_fill (cr);
cairo_restore (cr);
}
}
else if (line_display->has_block_cursor &&
gtk_widget_has_focus (text_renderer->widget) &&
byte_offset <= line_display->insert_index &&
(line_display->insert_index < byte_offset + line->length ||
(at_last_line && line_display->insert_index == byte_offset + line->length)))
{
GdkRectangle cursor_rect;
GdkColor cursor_color;
cairo_t *cr = text_renderer->cr;
/* we draw text using base color on filled cursor rectangle of cursor color
* (normally white on black) */
_gtk_widget_get_cursor_color (text_renderer->widget, &cursor_color);
cursor_rect.x = x + line_display->x_offset + line_display->block_cursor.x;
cursor_rect.y = y + line_display->block_cursor.y + line_display->top_margin;
cursor_rect.width = line_display->block_cursor.width;
cursor_rect.height = line_display->block_cursor.height;
cairo_save (cr);
gdk_cairo_rectangle (cr, &cursor_rect);
cairo_clip (cr);
gdk_cairo_set_source_color (cr, &cursor_color);
cairo_paint (cr);
/* draw text under the cursor if any */
if (!line_display->cursor_at_line_end)
{
gdk_cairo_set_source_color (cr,
&text_renderer->widget->style->base[text_renderer->widget->state]);
text_renderer_set_state (text_renderer, CURSOR);
pango_renderer_draw_layout_line (PANGO_RENDERER (text_renderer),
line,
PANGO_SCALE * x + line_rect.x,
PANGO_SCALE * y + baseline);
}
cairo_restore (cr);
}
}
byte_offset += line->length;
}
while (pango_layout_iter_next_line (iter));
pango_layout_iter_free (iter);
}
static GtkTextRenderer *
get_text_renderer (void)
{
static GtkTextRenderer *text_renderer = NULL;
if (!text_renderer)
text_renderer = g_object_new (GTK_TYPE_TEXT_RENDERER, NULL);
return text_renderer;
}
void
gtk_text_layout_draw (GtkTextLayout *layout,
GtkWidget *widget,
GdkDrawable *drawable,
GdkGC *cursor_gc,
/* Location of the drawable
in layout coordinates */
gint x_offset,
gint y_offset,
/* Region of the layout to
render */
gint x,
gint y,
gint width,
gint height,
/* widgets to expose */
GList **widgets)
{
GdkRectangle clip;
gint current_y;
GSList *cursor_list;
GtkTextRenderer *text_renderer;
GtkTextIter selection_start, selection_end;
gboolean have_selection = FALSE;
GSList *line_list;
GSList *tmp_list;
GList *tmp_widgets;
cairo_t *cr;
g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
g_return_if_fail (layout->default_style != NULL);
g_return_if_fail (layout->buffer != NULL);
g_return_if_fail (drawable != NULL);
g_return_if_fail (width >= 0);
g_return_if_fail (height >= 0);
if (width == 0 || height == 0)
return;
line_list = gtk_text_layout_get_lines (layout, y + y_offset, y + y_offset + height, &current_y);
current_y -= y_offset;
if (line_list == NULL)
return; /* nothing on the screen */
cr = gdk_cairo_create (drawable);
cairo_rectangle (cr, x, y, width, height);
cairo_clip (cr);
gdk_cairo_set_source_color (cr, &widget->style->text[widget->state]);
text_renderer = get_text_renderer ();
text_renderer_begin (text_renderer, widget, cr);
gtk_text_layout_wrap_loop_start (layout);
if (gtk_text_buffer_get_selection_bounds (layout->buffer,
&selection_start,
&selection_end))
have_selection = TRUE;
tmp_list = line_list;
while (tmp_list != NULL)
{
GtkTextLineDisplay *line_display;
gint selection_start_index = -1;
gint selection_end_index = -1;
gboolean have_strong;
gboolean have_weak;
GtkTextLine *line = tmp_list->data;
line_display = gtk_text_layout_get_line_display (layout, line, FALSE);
if (line_display->height > 0)
{
g_assert (line_display->layout != NULL);
if (have_selection)
{
GtkTextIter line_start, line_end;
gint byte_count;
gtk_text_layout_get_iter_at_line (layout,
&line_start,
line, 0);
line_end = line_start;
if (!gtk_text_iter_ends_line (&line_end))
gtk_text_iter_forward_to_line_end (&line_end);
byte_count = gtk_text_iter_get_visible_line_index (&line_end);
if (gtk_text_iter_compare (&selection_start, &line_end) <= 0 &&
gtk_text_iter_compare (&selection_end, &line_start) >= 0)
{
if (gtk_text_iter_compare (&selection_start, &line_start) >= 0)
selection_start_index = gtk_text_iter_get_visible_line_index (&selection_start);
else
selection_start_index = -1;
if (gtk_text_iter_compare (&selection_end, &line_end) <= 0)
selection_end_index = gtk_text_iter_get_visible_line_index (&selection_end);
else
selection_end_index = byte_count + 1; /* + 1 to flag past-the-end */
}
}
render_para (text_renderer, line_display,
- x_offset,
current_y,
selection_start_index, selection_end_index);
/* We paint the cursors last, because they overlap another chunk
and need to appear on top. */
have_strong = FALSE;
have_weak = FALSE;
cursor_list = line_display->cursors;
while (cursor_list)
{
GtkTextCursorDisplay *cursor = cursor_list->data;
if (cursor->is_strong)
have_strong = TRUE;
else
have_weak = TRUE;
cursor_list = cursor_list->next;
}
cursor_list = line_display->cursors;
while (cursor_list)
{
GtkTextCursorDisplay *cursor = cursor_list->data;
GtkTextDirection dir;
GdkRectangle cursor_location;
dir = line_display->direction;
if (have_strong && have_weak)
{
if (!cursor->is_strong)
dir = (dir == GTK_TEXT_DIR_RTL) ? GTK_TEXT_DIR_LTR : GTK_TEXT_DIR_RTL;
}
cursor_location.x = line_display->x_offset + cursor->x - x_offset;
cursor_location.y = current_y + line_display->top_margin + cursor->y;
cursor_location.width = 0;
cursor_location.height = cursor->height;
gtk_draw_insertion_cursor (widget, drawable, &clip, &cursor_location,
cursor->is_strong,
dir, have_strong && have_weak);
cursor_list = cursor_list->next;
}
} /* line_display->height > 0 */
current_y += line_display->height;
gtk_text_layout_free_line_display (layout, line_display);
tmp_list = g_slist_next (tmp_list);
}
gtk_text_layout_wrap_loop_end (layout);
tmp_widgets = text_renderer_end (text_renderer);
if (widgets)
*widgets = tmp_widgets;
else
{
g_list_foreach (tmp_widgets, (GFunc)g_object_unref, NULL);
g_list_free (tmp_widgets);
}
g_slist_free (line_list);
}
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