/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/* EText - Text item for evolution.
* Copyright (C) 2000 Helix Code, Inc.
*
* Author: Chris Lahey <clahey@umich.edu>
*
* A majority of code taken from:
*
* Text item type for GnomeCanvas widget
*
* GnomeCanvas is basically a port of the Tk toolkit's most excellent
* canvas widget. Tk is copyrighted by the Regents of the University
* of California, Sun Microsystems, and other parties.
*
* Copyright (C) 1998 The Free Software Foundation
*
* Author: Federico Mena <federico@nuclecu.unam.mx> */
#include <config.h>
#include <math.h>
#include "e-text.h"
#include <gdk/gdkx.h> /* for BlackPixel */
#include <libart_lgpl/art_affine.h>
#include <libart_lgpl/art_rgb.h>
#include <libart_lgpl/art_rgb_bitmap_affine.h>
/* This defines a line of text */
struct line {
char *text; /* Line's text, it is a pointer into the text->text string */
int length; /* Line's length in characters */
int width; /* Line's width in pixels */
int ellipsis_length; /* Length before adding ellipsis */
};
/* Object argument IDs */
enum {
ARG_0,
ARG_TEXT,
ARG_X,
ARG_Y,
ARG_FONT,
ARG_FONTSET,
ARG_FONT_GDK,
ARG_ANCHOR,
ARG_JUSTIFICATION,
ARG_CLIP_WIDTH,
ARG_CLIP_HEIGHT,
ARG_CLIP,
ARG_X_OFFSET,
ARG_Y_OFFSET,
ARG_FILL_COLOR,
ARG_FILL_COLOR_GDK,
ARG_FILL_COLOR_RGBA,
ARG_FILL_STIPPLE,
ARG_TEXT_WIDTH,
ARG_TEXT_HEIGHT,
ARG_USE_ELLIPSIS,
ARG_ELLIPSIS
};
static void e_text_class_init (ETextClass *class);
static void e_text_init (EText *text);
static void e_text_destroy (GtkObject *object);
static void e_text_set_arg (GtkObject *object, GtkArg *arg, guint arg_id);
static void e_text_get_arg (GtkObject *object, GtkArg *arg, guint arg_id);
static void e_text_update (GnomeCanvasItem *item, double *affine,
ArtSVP *clip_path, int flags);
static void e_text_realize (GnomeCanvasItem *item);
static void e_text_unrealize (GnomeCanvasItem *item);
static void e_text_draw (GnomeCanvasItem *item, GdkDrawable *drawable,
int x, int y, int width, int height);
static double e_text_point (GnomeCanvasItem *item, double x, double y, int cx, int cy,
GnomeCanvasItem **actual_item);
static void e_text_bounds (GnomeCanvasItem *item,
double *x1, double *y1, double *x2, double *y2);
static void e_text_render (GnomeCanvasItem *item, GnomeCanvasBuf *buf);
static ETextSuckFont *e_suck_font (GdkFont *font);
static void e_suck_font_free (ETextSuckFont *suckfont);
static GnomeCanvasItemClass *parent_class;
/**
* e_text_get_type:
* @void:
*
* Registers the &EText class if necessary, and returns the type ID
* associated to it.
*
* Return value: The type ID of the &EText class.
**/
GtkType
e_text_get_type (void)
{
static GtkType text_type = 0;
if (!text_type) {
GtkTypeInfo text_info = {
"EText",
sizeof (EText),
sizeof (ETextClass),
(GtkClassInitFunc) e_text_class_init,
(GtkObjectInitFunc) e_text_init,
NULL, /* reserved_1 */
NULL, /* reserved_2 */
(GtkClassInitFunc) NULL
};
text_type = gtk_type_unique (gnome_canvas_item_get_type (), &text_info);
}
return text_type;
}
/* Class initialization function for the text item */
static void
e_text_class_init (ETextClass *class)
{
GtkObjectClass *object_class;
GnomeCanvasItemClass *item_class;
object_class = (GtkObjectClass *) class;
item_class = (GnomeCanvasItemClass *) class;
parent_class = gtk_type_class (gnome_canvas_item_get_type ());
gtk_object_add_arg_type ("EText::text",
GTK_TYPE_STRING, GTK_ARG_READWRITE, ARG_TEXT);
gtk_object_add_arg_type ("EText::x",
GTK_TYPE_DOUBLE, GTK_ARG_READWRITE, ARG_X);
gtk_object_add_arg_type ("EText::y",
GTK_TYPE_DOUBLE, GTK_ARG_READWRITE, ARG_Y);
gtk_object_add_arg_type ("EText::font",
GTK_TYPE_STRING, GTK_ARG_WRITABLE, ARG_FONT);
gtk_object_add_arg_type ("EText::fontset",
GTK_TYPE_STRING, GTK_ARG_WRITABLE, ARG_FONTSET);
gtk_object_add_arg_type ("EText::font_gdk",
GTK_TYPE_GDK_FONT, GTK_ARG_READWRITE, ARG_FONT_GDK);
gtk_object_add_arg_type ("EText::anchor",
GTK_TYPE_ANCHOR_TYPE, GTK_ARG_READWRITE, ARG_ANCHOR);
gtk_object_add_arg_type ("EText::justification",
GTK_TYPE_JUSTIFICATION, GTK_ARG_READWRITE, ARG_JUSTIFICATION);
gtk_object_add_arg_type ("EText::clip_width",
GTK_TYPE_DOUBLE, GTK_ARG_READWRITE, ARG_CLIP_WIDTH);
gtk_object_add_arg_type ("EText::clip_height",
GTK_TYPE_DOUBLE, GTK_ARG_READWRITE, ARG_CLIP_HEIGHT);
gtk_object_add_arg_type ("EText::clip",
GTK_TYPE_BOOL, GTK_ARG_READWRITE, ARG_CLIP);
gtk_object_add_arg_type ("EText::x_offset",
GTK_TYPE_DOUBLE, GTK_ARG_READWRITE, ARG_X_OFFSET);
gtk_object_add_arg_type ("EText::y_offset",
GTK_TYPE_DOUBLE, GTK_ARG_READWRITE, ARG_Y_OFFSET);
gtk_object_add_arg_type ("EText::fill_color",
GTK_TYPE_STRING, GTK_ARG_WRITABLE, ARG_FILL_COLOR);
gtk_object_add_arg_type ("EText::fill_color_gdk",
GTK_TYPE_GDK_COLOR, GTK_ARG_READWRITE, ARG_FILL_COLOR_GDK);
gtk_object_add_arg_type ("EText::fill_color_rgba",
GTK_TYPE_UINT, GTK_ARG_READWRITE, ARG_FILL_COLOR_RGBA);
gtk_object_add_arg_type ("EText::fill_stipple",
GTK_TYPE_GDK_WINDOW, GTK_ARG_READWRITE, ARG_FILL_STIPPLE);
gtk_object_add_arg_type ("EText::text_width",
GTK_TYPE_DOUBLE, GTK_ARG_READABLE, ARG_TEXT_WIDTH);
gtk_object_add_arg_type ("EText::text_height",
GTK_TYPE_DOUBLE, GTK_ARG_READABLE, ARG_TEXT_HEIGHT);
gtk_object_add_arg_type ("EText::use_ellipsis",
GTK_TYPE_BOOL, GTK_ARG_READWRITE, ARG_USE_ELLIPSIS);
gtk_object_add_arg_type ("EText::ellipsis",
GTK_TYPE_STRING, GTK_ARG_READWRITE, ARG_ELLIPSIS);
object_class->destroy = e_text_destroy;
object_class->set_arg = e_text_set_arg;
object_class->get_arg = e_text_get_arg;
item_class->update = e_text_update;
item_class->realize = e_text_realize;
item_class->unrealize = e_text_unrealize;
item_class->draw = e_text_draw;
item_class->point = e_text_point;
item_class->bounds = e_text_bounds;
item_class->render = e_text_render;
}
/* Object initialization function for the text item */
static void
e_text_init (EText *text)
{
text->x = 0.0;
text->y = 0.0;
text->anchor = GTK_ANCHOR_CENTER;
text->justification = GTK_JUSTIFY_LEFT;
text->clip_width = 0.0;
text->clip_height = 0.0;
text->xofs = 0.0;
text->yofs = 0.0;
text->ellipsis = NULL;
text->use_ellipsis = FALSE;
text->ellipsis_width = 0;
}
/* Destroy handler for the text item */
static void
e_text_destroy (GtkObject *object)
{
EText *text;
g_return_if_fail (object != NULL);
g_return_if_fail (GNOME_IS_CANVAS_TEXT (object));
text = E_TEXT (object);
if (text->text)
g_free (text->text);
if (text->lines)
g_free (text->lines);
if (text->font)
gdk_font_unref (text->font);
if (text->suckfont)
e_suck_font_free (text->suckfont);
if (text->stipple)
gdk_bitmap_unref (text->stipple);
if (GTK_OBJECT_CLASS (parent_class)->destroy)
(* GTK_OBJECT_CLASS (parent_class)->destroy) (object);
}
static void
get_bounds_item_relative (EText *text, double *px1, double *py1, double *px2, double *py2)
{
GnomeCanvasItem *item;
double x, y;
double clip_x, clip_y;
item = GNOME_CANVAS_ITEM (text);
x = text->x;
y = text->y;
clip_x = x;
clip_y = y;
/* Calculate text dimensions */
if (text->text && text->font)
text->height = (text->font->ascent + text->font->descent) * text->num_lines;
else
text->height = 0;
/* Anchor text */
switch (text->anchor) {
case GTK_ANCHOR_NW:
case GTK_ANCHOR_W:
case GTK_ANCHOR_SW:
break;
case GTK_ANCHOR_N:
case GTK_ANCHOR_CENTER:
case GTK_ANCHOR_S:
x -= text->max_width / 2;
clip_x -= text->clip_width / 2;
break;
case GTK_ANCHOR_NE:
case GTK_ANCHOR_E:
case GTK_ANCHOR_SE:
x -= text->max_width;
clip_x -= text->clip_width;
break;
}
switch (text->anchor) {
case GTK_ANCHOR_NW:
case GTK_ANCHOR_N:
case GTK_ANCHOR_NE:
break;
case GTK_ANCHOR_W:
case GTK_ANCHOR_CENTER:
case GTK_ANCHOR_E:
y -= text->height / 2;
clip_y -= text->clip_height / 2;
break;
case GTK_ANCHOR_SW:
case GTK_ANCHOR_S:
case GTK_ANCHOR_SE:
y -= text->height;
clip_y -= text->clip_height;
break;
}
/* Bounds */
if (text->clip) {
/* maybe do bbox intersection here? */
*px1 = clip_x;
*py1 = clip_y;
*px2 = clip_x + text->clip_width;
*py2 = clip_y + text->clip_height;
} else {
*px1 = x;
*py1 = y;
*px2 = x + text->max_width;
*py2 = y + text->height;
}
}
static void
get_bounds (EText *text, double *px1, double *py1, double *px2, double *py2)
{
GnomeCanvasItem *item;
double wx, wy;
item = GNOME_CANVAS_ITEM (text);
/* Get canvas pixel coordinates for text position */
wx = text->x;
wy = text->y;
gnome_canvas_item_i2w (item, &wx, &wy);
gnome_canvas_w2c (item->canvas, wx + text->xofs, wy + text->yofs, &text->cx, &text->cy);
/* Get canvas pixel coordinates for clip rectangle position */
gnome_canvas_w2c (item->canvas, wx, wy, &text->clip_cx, &text->clip_cy);
text->clip_cwidth = text->clip_width * item->canvas->pixels_per_unit;
text->clip_cheight = text->clip_height * item->canvas->pixels_per_unit;
/* Calculate text dimensions */
if (text->text && text->font)
text->height = (text->font->ascent + text->font->descent) * text->num_lines;
else
text->height = 0;
/* Anchor text */
switch (text->anchor) {
case GTK_ANCHOR_NW:
case GTK_ANCHOR_W:
case GTK_ANCHOR_SW:
break;
case GTK_ANCHOR_N:
case GTK_ANCHOR_CENTER:
case GTK_ANCHOR_S:
text->cx -= text->max_width / 2;
text->clip_cx -= text->clip_cwidth / 2;
break;
case GTK_ANCHOR_NE:
case GTK_ANCHOR_E:
case GTK_ANCHOR_SE:
text->cx -= text->max_width;
text->clip_cx -= text->clip_cwidth;
break;
}
switch (text->anchor) {
case GTK_ANCHOR_NW:
case GTK_ANCHOR_N:
case GTK_ANCHOR_NE:
break;
case GTK_ANCHOR_W:
case GTK_ANCHOR_CENTER:
case GTK_ANCHOR_E:
text->cy -= text->height / 2;
text->clip_cy -= text->clip_cheight / 2;
break;
case GTK_ANCHOR_SW:
case GTK_ANCHOR_S:
case GTK_ANCHOR_SE:
text->cy -= text->height;
text->clip_cy -= text->clip_cheight;
break;
}
/* Bounds */
if (text->clip) {
*px1 = text->clip_cx;
*py1 = text->clip_cy;
*px2 = text->clip_cx + text->clip_cwidth;
*py2 = text->clip_cy + text->clip_cheight;
} else {
*px1 = text->cx;
*py1 = text->cy;
*px2 = text->cx + text->max_width;
*py2 = text->cy + text->height;
}
}
/* Recalculates the bounding box of the text item. The bounding box is defined
* by the text's extents if the clip rectangle is disabled. If it is enabled,
* the bounding box is defined by the clip rectangle itself.
*/
static void
recalc_bounds (EText *text)
{
GnomeCanvasItem *item;
item = GNOME_CANVAS_ITEM (text);
get_bounds (text, &item->x1, &item->y1, &item->x2, &item->y2);
gnome_canvas_group_child_bounds (GNOME_CANVAS_GROUP (item->parent), item);
}
static void
calc_ellipsis (EText *text)
{
if (text->font)
text->ellipsis_width =
gdk_text_width (text->font,
text->ellipsis ? text->ellipsis : "...",
text->ellipsis ? strlen (text->ellipsis) : 3);
}
/* Calculates the line widths (in pixels) of the text's splitted lines */
static void
calc_line_widths (EText *text)
{
struct line *lines;
int i;
int j;
lines = text->lines;
text->max_width = 0;
if (!lines)
return;
for (i = 0; i < text->num_lines; i++) {
if (lines->length != 0) {
if (text->font) {
lines->width = gdk_text_width (text->font,
lines->text, lines->length);
lines->ellipsis_length = 0;
} else {
lines->width = 0;
}
if (text->clip &&
text->use_ellipsis &&
lines->width > text->clip_width) {
if (text->font) {
lines->ellipsis_length = 0;
for (j = 0; j < lines->length; j++ ) {
if (gdk_text_width (text->font, lines->text, j) + text->ellipsis_width <= text->clip_width)
lines->ellipsis_length = j;
else
break;
}
}
else
lines->ellipsis_length = 0;
lines->width = gdk_text_width (text->font, lines->text, lines->ellipsis_length) +
text->ellipsis_width;
}
else
lines->ellipsis_length = lines->length;
if (lines->width > text->max_width)
text->max_width = lines->width;
}
lines++;
}
}
/* Splits the text of the text item into lines */
static void
split_into_lines (EText *text)
{
char *p;
struct line *lines;
int len;
/* Free old array of lines */
if (text->lines)
g_free (text->lines);
text->lines = NULL;
text->num_lines = 0;
if (!text->text)
return;
/* First, count the number of lines */
for (p = text->text; *p; p++)
if (*p == '\n')
text->num_lines++;
text->num_lines++;
/* Allocate array of lines and calculate split positions */
text->lines = lines = g_new0 (struct line, text->num_lines);
len = 0;
for (p = text->text; *p; p++) {
if (*p == '\n') {
lines->length = len;
lines++;
len = 0;
} else if (len == 0) {
len++;
lines->text = p;
} else
len++;
}
lines->length = len;
calc_line_widths (text);
}
/* Convenience function to set the text's GC's foreground color */
static void
set_text_gc_foreground (EText *text)
{
GdkColor c;
if (!text->gc)
return;
c.pixel = text->pixel;
gdk_gc_set_foreground (text->gc, &c);
}
/* Sets the stipple pattern for the text */
static void
set_stipple (EText *text, GdkBitmap *stipple, int reconfigure)
{
if (text->stipple && !reconfigure)
gdk_bitmap_unref (text->stipple);
text->stipple = stipple;
if (stipple && !reconfigure)
gdk_bitmap_ref (stipple);
if (text->gc) {
if (stipple) {
gdk_gc_set_stipple (text->gc, stipple);
gdk_gc_set_fill (text->gc, GDK_STIPPLED);
} else
gdk_gc_set_fill (text->gc, GDK_SOLID);
}
}
/* Set_arg handler for the text item */
static void
e_text_set_arg (GtkObject *object, GtkArg *arg, guint arg_id)
{
GnomeCanvasItem *item;
EText *text;
GdkColor color = { 0, 0, 0, 0, };
GdkColor *pcolor;
gboolean color_changed;
int have_pixel;
item = GNOME_CANVAS_ITEM (object);
text = E_TEXT (object);
color_changed = FALSE;
have_pixel = FALSE;
switch (arg_id) {
case ARG_TEXT:
if (text->text)
g_free (text->text);
text->text = g_strdup (GTK_VALUE_STRING (*arg));
split_into_lines (text);
recalc_bounds (text);
break;
case ARG_X:
text->x = GTK_VALUE_DOUBLE (*arg);
recalc_bounds (text);
break;
case ARG_Y:
text->y = GTK_VALUE_DOUBLE (*arg);
recalc_bounds (text);
break;
case ARG_FONT:
if (text->font)
gdk_font_unref (text->font);
text->font = gdk_font_load (GTK_VALUE_STRING (*arg));
if (item->canvas->aa) {
if (text->suckfont)
e_suck_font_free (text->suckfont);
text->suckfont = e_suck_font (text->font);
}
calc_ellipsis (text);
calc_line_widths (text);
recalc_bounds (text);
break;
case ARG_FONTSET:
if (text->font)
gdk_font_unref (text->font);
text->font = gdk_fontset_load (GTK_VALUE_STRING (*arg));
if (item->canvas->aa) {
if (text->suckfont)
e_suck_font_free (text->suckfont);
text->suckfont = e_suck_font (text->font);
}
calc_ellipsis (text);
calc_line_widths (text);
recalc_bounds (text);
break;
case ARG_FONT_GDK:
if (text->font)
gdk_font_unref (text->font);
text->font = GTK_VALUE_BOXED (*arg);
gdk_font_ref (text->font);
if (item->canvas->aa) {
if (text->suckfont)
e_suck_font_free (text->suckfont);
text->suckfont = e_suck_font (text->font);
}
calc_ellipsis (text);
calc_line_widths (text);
recalc_bounds (text);
break;
case ARG_ANCHOR:
text->anchor = GTK_VALUE_ENUM (*arg);
recalc_bounds (text);
break;
case ARG_JUSTIFICATION:
text->justification = GTK_VALUE_ENUM (*arg);
break;
case ARG_CLIP_WIDTH:
text->clip_width = fabs (GTK_VALUE_DOUBLE (*arg));
calc_ellipsis (text);
calc_line_widths (text);
recalc_bounds (text);
break;
case ARG_CLIP_HEIGHT:
text->clip_height = fabs (GTK_VALUE_DOUBLE (*arg));
recalc_bounds (text);
break;
case ARG_CLIP:
text->clip = GTK_VALUE_BOOL (*arg);
calc_ellipsis (text);
calc_line_widths (text);
recalc_bounds (text);
break;
case ARG_X_OFFSET:
text->xofs = GTK_VALUE_DOUBLE (*arg);
recalc_bounds (text);
break;
case ARG_Y_OFFSET:
text->yofs = GTK_VALUE_DOUBLE (*arg);
recalc_bounds (text);
break;
case ARG_FILL_COLOR:
if (GTK_VALUE_STRING (*arg))
gdk_color_parse (GTK_VALUE_STRING (*arg), &color);
text->rgba = ((color.red & 0xff00) << 16 |
(color.green & 0xff00) << 8 |
(color.blue & 0xff00) |
0xff);
color_changed = TRUE;
break;
case ARG_FILL_COLOR_GDK:
pcolor = GTK_VALUE_BOXED (*arg);
if (pcolor) {
color = *pcolor;
gdk_color_context_query_color (item->canvas->cc, &color);
have_pixel = TRUE;
}
text->rgba = ((color.red & 0xff00) << 16 |
(color.green & 0xff00) << 8 |
(color.blue & 0xff00) |
0xff);
color_changed = TRUE;
break;
case ARG_FILL_COLOR_RGBA:
text->rgba = GTK_VALUE_UINT (*arg);
color_changed = TRUE;
break;
case ARG_FILL_STIPPLE:
set_stipple (text, GTK_VALUE_BOXED (*arg), FALSE);
break;
case ARG_USE_ELLIPSIS:
text->use_ellipsis = GTK_VALUE_BOOL (*arg);
calc_line_widths (text);
recalc_bounds (text);
break;
case ARG_ELLIPSIS:
if (text->ellipsis)
g_free (text->ellipsis);
text->ellipsis = g_strdup (GTK_VALUE_STRING (*arg));
calc_ellipsis (text);
calc_line_widths (text);
recalc_bounds (text);
break;
default:
break;
}
if (color_changed) {
if (have_pixel)
text->pixel = color.pixel;
else
text->pixel = gnome_canvas_get_color_pixel (item->canvas, text->rgba);
if (!item->canvas->aa)
set_text_gc_foreground (text);
gnome_canvas_item_request_update (item);
}
}
/* Get_arg handler for the text item */
static void
e_text_get_arg (GtkObject *object, GtkArg *arg, guint arg_id)
{
EText *text;
GdkColor *color;
text = E_TEXT (object);
switch (arg_id) {
case ARG_TEXT:
GTK_VALUE_STRING (*arg) = g_strdup (text->text);
break;
case ARG_X:
GTK_VALUE_DOUBLE (*arg) = text->x;
break;
case ARG_Y:
GTK_VALUE_DOUBLE (*arg) = text->y;
break;
case ARG_FONT_GDK:
GTK_VALUE_BOXED (*arg) = text->font;
break;
case ARG_ANCHOR:
GTK_VALUE_ENUM (*arg) = text->anchor;
break;
case ARG_JUSTIFICATION:
GTK_VALUE_ENUM (*arg) = text->justification;
break;
case ARG_CLIP_WIDTH:
GTK_VALUE_DOUBLE (*arg) = text->clip_width;
break;
case ARG_CLIP_HEIGHT:
GTK_VALUE_DOUBLE (*arg) = text->clip_height;
break;
case ARG_CLIP:
GTK_VALUE_BOOL (*arg) = text->clip;
break;
case ARG_X_OFFSET:
GTK_VALUE_DOUBLE (*arg) = text->xofs;
break;
case ARG_Y_OFFSET:
GTK_VALUE_DOUBLE (*arg) = text->yofs;
break;
case ARG_FILL_COLOR_GDK:
color = g_new (GdkColor, 1);
color->pixel = text->pixel;
gdk_color_context_query_color (text->item.canvas->cc, color);
GTK_VALUE_BOXED (*arg) = color;
break;
case ARG_FILL_COLOR_RGBA:
GTK_VALUE_UINT (*arg) = text->rgba;
break;
case ARG_FILL_STIPPLE:
GTK_VALUE_BOXED (*arg) = text->stipple;
break;
case ARG_TEXT_WIDTH:
GTK_VALUE_DOUBLE (*arg) = text->max_width / text->item.canvas->pixels_per_unit;
break;
case ARG_TEXT_HEIGHT:
GTK_VALUE_DOUBLE (*arg) = text->height / text->item.canvas->pixels_per_unit;
break;
case ARG_USE_ELLIPSIS:
GTK_VALUE_BOOL (*arg) = text->use_ellipsis;
break;
case ARG_ELLIPSIS:
GTK_VALUE_STRING (*arg) = g_strdup (text->ellipsis);
break;
default:
arg->type = GTK_TYPE_INVALID;
break;
}
}
/* Update handler for the text item */
static void
e_text_update (GnomeCanvasItem *item, double *affine, ArtSVP *clip_path, int flags)
{
EText *text;
double x1, y1, x2, y2;
ArtDRect i_bbox, c_bbox;
int i;
text = E_TEXT (item);
if (parent_class->update)
(* parent_class->update) (item, affine, clip_path, flags);
if (!item->canvas->aa) {
set_text_gc_foreground (text);
set_stipple (text, text->stipple, TRUE);
get_bounds (text, &x1, &y1, &x2, &y2);
gnome_canvas_update_bbox (item, x1, y1, x2, y2);
} else {
/* aa rendering */
for (i = 0; i < 6; i++)
text->affine[i] = affine[i];
get_bounds_item_relative (text, &i_bbox.x0, &i_bbox.y0, &i_bbox.x1, &i_bbox.y1);
art_drect_affine_transform (&c_bbox, &i_bbox, affine);
gnome_canvas_update_bbox (item, c_bbox.x0, c_bbox.y0, c_bbox.x1, c_bbox.y1);
}
}
/* Realize handler for the text item */
static void
e_text_realize (GnomeCanvasItem *item)
{
EText *text;
text = E_TEXT (item);
if (parent_class->realize)
(* parent_class->realize) (item);
text->gc = gdk_gc_new (item->canvas->layout.bin_window);
}
/* Unrealize handler for the text item */
static void
e_text_unrealize (GnomeCanvasItem *item)
{
EText *text;
text = E_TEXT (item);
gdk_gc_unref (text->gc);
text->gc = NULL;
if (parent_class->unrealize)
(* parent_class->unrealize) (item);
}
/* Calculates the x position of the specified line of text, based on the text's justification */
static double
get_line_xpos_item_relative (EText *text, struct line *line)
{
double x;
x = text->x;
switch (text->anchor) {
case GTK_ANCHOR_NW:
case GTK_ANCHOR_W:
case GTK_ANCHOR_SW:
break;
case GTK_ANCHOR_N:
case GTK_ANCHOR_CENTER:
case GTK_ANCHOR_S:
x -= text->max_width / 2;
break;
case GTK_ANCHOR_NE:
case GTK_ANCHOR_E:
case GTK_ANCHOR_SE:
x -= text->max_width;
break;
}
switch (text->justification) {
case GTK_JUSTIFY_RIGHT:
x += text->max_width - line->width;
break;
case GTK_JUSTIFY_CENTER:
x += (text->max_width - line->width) * 0.5;
break;
default:
/* For GTK_JUSTIFY_LEFT, we don't have to do anything. We do not support
* GTK_JUSTIFY_FILL, yet.
*/
break;
}
return x;
}
/* Calculates the y position of the first line of text. */
static double
get_line_ypos_item_relative (EText *text)
{
double y;
y = text->y;
switch (text->anchor) {
case GTK_ANCHOR_NW:
case GTK_ANCHOR_N:
case GTK_ANCHOR_NE:
break;
case GTK_ANCHOR_W:
case GTK_ANCHOR_CENTER:
case GTK_ANCHOR_E:
y -= text->height / 2;
break;
case GTK_ANCHOR_SW:
case GTK_ANCHOR_S:
case GTK_ANCHOR_SE:
y -= text->height;
break;
}
return y;
}
/* Calculates the x position of the specified line of text, based on the text's justification */
static int
get_line_xpos (EText *text, struct line *line)
{
int x;
x = text->cx;
switch (text->justification) {
case GTK_JUSTIFY_RIGHT:
x += text->max_width - line->width;
break;
case GTK_JUSTIFY_CENTER:
x += (text->max_width - line->width) / 2;
break;
default:
/* For GTK_JUSTIFY_LEFT, we don't have to do anything. We do not support
* GTK_JUSTIFY_FILL, yet.
*/
break;
}
return x;
}
/* Draw handler for the text item */
static void
e_text_draw (GnomeCanvasItem *item, GdkDrawable *drawable,
int x, int y, int width, int height)
{
EText *text;
GdkRectangle rect;
struct line *lines;
int i;
int xpos, ypos;
text = E_TEXT (item);
if (!text->text || !text->font)
return;
if (text->clip) {
rect.x = text->clip_cx - x;
rect.y = text->clip_cy - y;
rect.width = text->clip_cwidth;
rect.height = text->clip_cheight;
gdk_gc_set_clip_rectangle (text->gc, &rect);
}
lines = text->lines;
ypos = text->cy + text->font->ascent;
if (text->stipple)
gnome_canvas_set_stipple_origin (item->canvas, text->gc);
for (i = 0; i < text->num_lines; i++) {
if (lines->length != 0) {
xpos = get_line_xpos (text, lines);
if ( text->clip && text->use_ellipsis && lines->ellipsis_length < lines->length) {
gdk_draw_text (drawable,
text->font,
text->gc,
xpos - x,
ypos - y,
lines->text,
lines->ellipsis_length);
gdk_draw_text (drawable,
text->font,
text->gc,
xpos - x +
lines->width - text->ellipsis_width,
ypos - y,
text->ellipsis ? text->ellipsis : "...",
text->ellipsis ? strlen (text->ellipsis) : 3);
} else
gdk_draw_text (drawable,
text->font,
text->gc,
xpos - x,
ypos - y,
lines->text,
lines->length);
}
ypos += text->font->ascent + text->font->descent;
lines++;
}
if (text->clip)
gdk_gc_set_clip_rectangle (text->gc, NULL);
}
/* Render handler for the text item */
static void
e_text_render (GnomeCanvasItem *item, GnomeCanvasBuf *buf)
{
EText *text;
guint32 fg_color;
double xpos, ypos;
struct line *lines;
int i, j;
double affine[6];
ETextSuckFont *suckfont;
int dx, dy;
ArtPoint start_i, start_c;
text = E_TEXT (item);
if (!text->text || !text->font || !text->suckfont)
return;
suckfont = text->suckfont;
fg_color = text->rgba;
gnome_canvas_buf_ensure_buf (buf);
lines = text->lines;
start_i.y = get_line_ypos_item_relative (text);
art_affine_scale (affine, item->canvas->pixels_per_unit, item->canvas->pixels_per_unit);
for (i = 0; i < 6; i++)
affine[i] = text->affine[i];
for (i = 0; i < text->num_lines; i++) {
if (lines->length != 0) {
start_i.x = get_line_xpos_item_relative (text, lines);
art_affine_point (&start_c, &start_i, text->affine);
xpos = start_c.x;
ypos = start_c.y;
for (j = 0; j < lines->length; j++) {
ETextSuckChar *ch;
ch = &suckfont->chars[(unsigned char)((lines->text)[j])];
affine[4] = xpos;
affine[5] = ypos;
art_rgb_bitmap_affine (
buf->buf,
buf->rect.x0, buf->rect.y0, buf->rect.x1, buf->rect.y1,
buf->buf_rowstride,
suckfont->bitmap + (ch->bitmap_offset >> 3),
ch->width,
suckfont->bitmap_height,
suckfont->bitmap_width >> 3,
fg_color,
affine,
ART_FILTER_NEAREST, NULL);
dx = ch->left_sb + ch->width + ch->right_sb;
xpos += dx * affine[0];
ypos += dx * affine[1];
}
}
dy = text->font->ascent + text->font->descent;
start_i.y += dy;
lines++;
}
buf->is_bg = 0;
}
/* Point handler for the text item */
static double
e_text_point (GnomeCanvasItem *item, double x, double y,
int cx, int cy, GnomeCanvasItem **actual_item)
{
EText *text;
int i;
struct line *lines;
int x1, y1, x2, y2;
int font_height;
int dx, dy;
double dist, best;
text = E_TEXT (item);
*actual_item = item;
/* The idea is to build bounding rectangles for each of the lines of
* text (clipped by the clipping rectangle, if it is activated) and see
* whether the point is inside any of these. If it is, we are done.
* Otherwise, calculate the distance to the nearest rectangle.
*/
if (text->font)
font_height = text->font->ascent + text->font->descent;
else
font_height = 0;
best = 1.0e36;
lines = text->lines;
for (i = 0; i < text->num_lines; i++) {
/* Compute the coordinates of rectangle for the current line,
* clipping if appropriate.
*/
x1 = get_line_xpos (text, lines);
y1 = text->cy + i * font_height;
x2 = x1 + lines->width;
y2 = y1 + font_height;
if (text->clip) {
if (x1 < text->clip_cx)
x1 = text->clip_cx;
if (y1 < text->clip_cy)
y1 = text->clip_cy;
if (x2 > (text->clip_cx + text->clip_width))
x2 = text->clip_cx + text->clip_width;
if (y2 > (text->clip_cy + text->clip_height))
y2 = text->clip_cy + text->clip_height;
if ((x1 >= x2) || (y1 >= y2))
continue;
}
/* Calculate distance from point to rectangle */
if (cx < x1)
dx = x1 - cx;
else if (cx >= x2)
dx = cx - x2 + 1;
else
dx = 0;
if (cy < y1)
dy = y1 - cy;
else if (cy >= y2)
dy = cy - y2 + 1;
else
dy = 0;
if ((dx == 0) && (dy == 0))
return 0.0;
dist = sqrt (dx * dx + dy * dy);
if (dist < best)
best = dist;
/* Next! */
lines++;
}
return best / item->canvas->pixels_per_unit;
}
/* Bounds handler for the text item */
static void
e_text_bounds (GnomeCanvasItem *item, double *x1, double *y1, double *x2, double *y2)
{
EText *text;
double width, height;
text = E_TEXT (item);
*x1 = text->x;
*y1 = text->y;
if (text->clip) {
width = text->clip_width;
height = text->clip_height;
} else {
width = text->max_width / item->canvas->pixels_per_unit;
height = text->height / item->canvas->pixels_per_unit;
}
switch (text->anchor) {
case GTK_ANCHOR_NW:
case GTK_ANCHOR_W:
case GTK_ANCHOR_SW:
break;
case GTK_ANCHOR_N:
case GTK_ANCHOR_CENTER:
case GTK_ANCHOR_S:
*x1 -= width / 2.0;
break;
case GTK_ANCHOR_NE:
case GTK_ANCHOR_E:
case GTK_ANCHOR_SE:
*x1 -= width;
break;
}
switch (text->anchor) {
case GTK_ANCHOR_NW:
case GTK_ANCHOR_N:
case GTK_ANCHOR_NE:
break;
case GTK_ANCHOR_W:
case GTK_ANCHOR_CENTER:
case GTK_ANCHOR_E:
*y1 -= height / 2.0;
break;
case GTK_ANCHOR_SW:
case GTK_ANCHOR_S:
case GTK_ANCHOR_SE:
*y1 -= height;
break;
}
*x2 = *x1 + width;
*y2 = *y1 + height;
}
/* Routines for sucking fonts from the X server */
static ETextSuckFont *
e_suck_font (GdkFont *font)
{
ETextSuckFont *suckfont;
int i;
int x, y;
char text[1];
int lbearing, rbearing, ch_width, ascent, descent;
GdkPixmap *pixmap;
GdkColor black, white;
GdkImage *image;
GdkGC *gc;
guchar *bitmap, *line;
int width, height;
int black_pixel, pixel;
if (!font)
return NULL;
suckfont = g_new (ETextSuckFont, 1);
height = font->ascent + font->descent;
x = 0;
for (i = 0; i < 256; i++) {
text[0] = i;
gdk_text_extents (font, text, 1,
&lbearing, &rbearing, &ch_width, &ascent, &descent);
suckfont->chars[i].left_sb = lbearing;
suckfont->chars[i].right_sb = ch_width - rbearing;
suckfont->chars[i].width = rbearing - lbearing;
suckfont->chars[i].ascent = ascent;
suckfont->chars[i].descent = descent;
suckfont->chars[i].bitmap_offset = x;
x += (ch_width + 31) & -32;
}
width = x;
suckfont->bitmap_width = width;
suckfont->bitmap_height = height;
suckfont->ascent = font->ascent;
pixmap = gdk_pixmap_new (NULL, suckfont->bitmap_width,
suckfont->bitmap_height, 1);
gc = gdk_gc_new (pixmap);
gdk_gc_set_font (gc, font);
black_pixel = BlackPixel (gdk_display, DefaultScreen (gdk_display));
black.pixel = black_pixel;
white.pixel = WhitePixel (gdk_display, DefaultScreen (gdk_display));
gdk_gc_set_foreground (gc, &white);
gdk_draw_rectangle (pixmap, gc, 1, 0, 0, width, height);
gdk_gc_set_foreground (gc, &black);
for (i = 0; i < 256; i++) {
text[0] = i;
gdk_draw_text (pixmap, font, gc,
suckfont->chars[i].bitmap_offset - suckfont->chars[i].left_sb,
font->ascent,
text, 1);
}
/* The handling of the image leaves me with distinct unease. But this
* is more or less copied out of gimp/app/text_tool.c, so it _ought_ to
* work. -RLL
*/
image = gdk_image_get (pixmap, 0, 0, width, height);
suckfont->bitmap = g_malloc0 ((width >> 3) * height);
line = suckfont->bitmap;
for (y = 0; y < height; y++) {
for (x = 0; x < width; x++) {
pixel = gdk_image_get_pixel (image, x, y);
if (pixel == black_pixel)
line[x >> 3] |= 128 >> (x & 7);
}
line += width >> 3;
}
gdk_image_destroy (image);
/* free the pixmap */
gdk_pixmap_unref (pixmap);
/* free the gc */
gdk_gc_destroy (gc);
return suckfont;
}
static void
e_suck_font_free (ETextSuckFont *suckfont)
{
g_free (suckfont->bitmap);
g_free (suckfont);
}
