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gtk/gdk/gdkpango.c
Behdad Esfahbod 1f9890c7d8 Fix quadratic implementation of gdk_pango_layout_get_clip_region into a 
2006-07-08  Behdad Esfahbod  <behdad@gnome.org>

        * gdk/gdkpango.c (layout_iter_get_line_clip_region),
        (gdk_pango_layout_line_get_clip_region),
        (gdk_pango_layout_get_clip_region): Fix quadratic implementation of
        gdk_pango_layout_get_clip_region into a linear one. (#337910, patch
        by Priit Laes)
2006-07-08 22:58:06 +00:00

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/* GDK - The GIMP Drawing Kit
* Copyright (C) 2000 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, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include <config.h>
#include <math.h>
#include <pango/pangocairo.h>
#include "gdkcairo.h"
#include "gdkcolor.h"
#include "gdkgc.h"
#include "gdkinternals.h"
#include "gdkpango.h"
#include "gdkrgb.h"
#include "gdkprivate.h"
#include "gdkscreen.h"
#include "gdkalias.h"
#include "gdkintl.h"
#define GDK_INFO_KEY "gdk-info"
/* We have various arrays indexed by render part; if PangoRenderPart
* is extended, we want to make sure not to overwrite the end of
* those arrays.
*/
#define MAX_RENDER_PART PANGO_RENDER_PART_STRIKETHROUGH
struct _GdkPangoRendererPrivate
{
GdkScreen *screen;
/* GdkPangoRenderer specific state */
PangoColor override_color[MAX_RENDER_PART + 1];
gboolean override_color_set[MAX_RENDER_PART + 1];
GdkBitmap *stipple[MAX_RENDER_PART + 1];
gboolean embossed;
cairo_t *cr;
PangoRenderPart last_part;
/* Current target */
GdkDrawable *drawable;
GdkGC *base_gc;
gboolean gc_changed;
};
static PangoAttrType gdk_pango_attr_stipple_type;
static PangoAttrType gdk_pango_attr_embossed_type;
enum {
PROP_0,
PROP_SCREEN
};
G_DEFINE_TYPE (GdkPangoRenderer, gdk_pango_renderer, PANGO_TYPE_RENDERER)
static void
gdk_pango_renderer_finalize (GObject *object)
{
GdkPangoRenderer *gdk_renderer = GDK_PANGO_RENDERER (object);
GdkPangoRendererPrivate *priv = gdk_renderer->priv;
int i;
if (priv->base_gc)
g_object_unref (priv->base_gc);
if (priv->drawable)
g_object_unref (priv->drawable);
for (i = 0; i <= MAX_RENDER_PART; i++)
if (priv->stipple[i])
g_object_unref (priv->stipple[i]);
G_OBJECT_CLASS (gdk_pango_renderer_parent_class)->finalize (object);
}
static GObject*
gdk_pango_renderer_constructor (GType type,
guint n_construct_properties,
GObjectConstructParam *construct_params)
{
GObject *object;
GdkPangoRenderer *gdk_renderer;
object = (* G_OBJECT_CLASS (gdk_pango_renderer_parent_class)->constructor) (type,
n_construct_properties,
construct_params);
gdk_renderer = GDK_PANGO_RENDERER (object);
if (!gdk_renderer->priv->screen)
{
g_warning ("Screen must be specified at construct time for GdkPangoRenderer");
gdk_renderer->priv->screen = gdk_screen_get_default ();
}
return object;
}
/* Adjusts matrix and color for the renderer to draw the secondary
* "shadow" copy for embossed text */
static void
emboss_context (cairo_t *cr)
{
cairo_matrix_t tmp_matrix;
/* The gymnastics here to adjust the matrix are because we want
* to offset by +1,+1 in device-space, not in user-space,
* so we can't just draw the layout at x + 1, y + 1
*/
cairo_get_matrix (cr, &tmp_matrix);
tmp_matrix.x0 += 1.0;
tmp_matrix.y0 += 1.0;
cairo_set_matrix (cr, &tmp_matrix);
cairo_set_source_rgb (cr, 1.0, 1.0, 1.0);
}
static inline gboolean
color_equal (PangoColor *c1, PangoColor *c2)
{
if (!c1 && !c2)
return TRUE;
if (c1 && c2 &&
c1->red == c2->red &&
c1->green == c2->green &&
c1->blue == c2->blue)
return TRUE;
return FALSE;
}
static cairo_t *
get_cairo_context (GdkPangoRenderer *gdk_renderer,
PangoRenderPart part)
{
PangoRenderer *renderer = PANGO_RENDERER (gdk_renderer);
GdkPangoRendererPrivate *priv = gdk_renderer->priv;
if (!priv->cr)
{
const PangoMatrix *matrix;
priv->cr = gdk_cairo_create (priv->drawable);
matrix = pango_renderer_get_matrix (renderer);
if (matrix)
{
cairo_matrix_t cairo_matrix;
cairo_matrix_init (&cairo_matrix,
matrix->xx, matrix->yx,
matrix->xy, matrix->yy,
matrix->x0, matrix->y0);
cairo_set_matrix (priv->cr, &cairo_matrix);
}
}
if (part != priv->last_part)
{
PangoColor *pango_color;
GdkColor *color;
GdkColor tmp_color;
gboolean changed;
pango_color = pango_renderer_get_color (renderer, part);
if (priv->last_part != -1)
changed = priv->gc_changed ||
priv->stipple[priv->last_part] != priv->stipple[part] ||
!color_equal (pango_color,
pango_renderer_get_color (renderer, priv->last_part));
else
changed = TRUE;
if (changed)
{
if (pango_color)
{
tmp_color.red = pango_color->red;
tmp_color.green = pango_color->green;
tmp_color.blue = pango_color->blue;
color = &tmp_color;
}
else
color = NULL;
_gdk_gc_update_context (priv->base_gc,
priv->cr,
color,
priv->stipple[part],
priv->gc_changed);
}
priv->last_part = part;
priv->gc_changed = FALSE;
}
return priv->cr;
}
static void
gdk_pango_renderer_draw_glyphs (PangoRenderer *renderer,
PangoFont *font,
PangoGlyphString *glyphs,
int x,
int y)
{
GdkPangoRenderer *gdk_renderer = GDK_PANGO_RENDERER (renderer);
GdkPangoRendererPrivate *priv = gdk_renderer->priv;
cairo_t *cr;
cr = get_cairo_context (gdk_renderer,
PANGO_RENDER_PART_FOREGROUND);
if (priv->embossed)
{
cairo_save (cr);
emboss_context (cr);
cairo_move_to (cr, (double)x / PANGO_SCALE, (double)y / PANGO_SCALE);
pango_cairo_show_glyph_string (cr, font, glyphs);
cairo_restore (cr);
}
cairo_move_to (cr, (double)x / PANGO_SCALE, (double)y / PANGO_SCALE);
pango_cairo_show_glyph_string (cr, font, glyphs);
}
/* Draws an error underline that looks like one of:
* H E H
* /\ /\ /\ /\ /\ -
* A/ \ / \ / \ A/ \ / \ |
* \ \ / \ / /D \ \ / \ |
* \ \/ C \/ / \ \/ C \ | height = HEIGHT_SQUARES * square
* \ /\ F / \ F /\ \ |
* \ / \ / \ / \ \G |
* \ / \ / \ / \ / |
* \/ \/ \/ \/ -
* B B
* |----|
* unit_width = (HEIGHT_SQUARES - 1) * square
*
* The x, y, width, height passed in give the desired bounding box;
* x/width are adjusted to make the underline a integer number of units
* wide.
*/
#define HEIGHT_SQUARES 2.5
/* Cut-and-pasted between here and pango/pango/pangocairo-render.c */
static void
draw_error_underline (cairo_t *cr,
double x,
double y,
double width,
double height)
{
double square = height / HEIGHT_SQUARES;
double unit_width = (HEIGHT_SQUARES - 1) * square;
int width_units = (width + unit_width / 2) / unit_width;
double y_top, y_bottom;
int i;
x += (width - width_units * unit_width) / 2;
width = width_units * unit_width;
y_top = y;
y_bottom = y + height;
/* Bottom of squiggle */
cairo_move_to (cr, x - square / 2, y_top + square / 2); /* A */
for (i = 0; i < width_units; i += 2)
{
double x_middle = x + (i + 1) * unit_width;
double x_right = x + (i + 2) * unit_width;
cairo_line_to (cr, x_middle, y_bottom); /* B */
if (i + 1 == width_units)
/* Nothing */;
else if (i + 2 == width_units)
cairo_line_to (cr, x_right + square / 2, y_top + square / 2); /* D */
else
cairo_line_to (cr, x_right, y_top + square); /* C */
}
/* Top of squiggle */
for (i -= 2; i >= 0; i -= 2)
{
double x_left = x + i * unit_width;
double x_middle = x + (i + 1) * unit_width;
double x_right = x + (i + 2) * unit_width;
if (i + 1 == width_units)
cairo_line_to (cr, x_middle + square / 2, y_bottom - square / 2); /* G */
else {
if (i + 2 == width_units)
cairo_line_to (cr, x_right, y_top); /* E */
cairo_line_to (cr, x_middle, y_bottom - square); /* F */
}
cairo_line_to (cr, x_left, y_top); /* H */
}
cairo_close_path (cr);
cairo_fill (cr);
}
static void
gdk_pango_renderer_draw_rectangle (PangoRenderer *renderer,
PangoRenderPart part,
int x,
int y,
int width,
int height)
{
GdkPangoRenderer *gdk_renderer = GDK_PANGO_RENDERER (renderer);
GdkPangoRendererPrivate *priv = gdk_renderer->priv;
cairo_t *cr;
cr = get_cairo_context (gdk_renderer, part);
if (priv->embossed && part != PANGO_RENDER_PART_BACKGROUND)
{
cairo_save (cr);
emboss_context (cr);
cairo_rectangle (cr,
(double)x / PANGO_SCALE, (double)y / PANGO_SCALE,
(double)width / PANGO_SCALE, (double)height / PANGO_SCALE);
cairo_fill (cr);
cairo_restore (cr);
}
cairo_rectangle (cr,
(double)x / PANGO_SCALE, (double)y / PANGO_SCALE,
(double)width / PANGO_SCALE, (double)height / PANGO_SCALE);
cairo_fill (cr);
}
static void
gdk_pango_renderer_draw_error_underline (PangoRenderer *renderer,
int x,
int y,
int width,
int height)
{
GdkPangoRenderer *gdk_renderer = GDK_PANGO_RENDERER (renderer);
GdkPangoRendererPrivate *priv = gdk_renderer->priv;
cairo_t *cr;
cr = get_cairo_context (gdk_renderer, PANGO_RENDER_PART_UNDERLINE);
if (priv->embossed)
{
cairo_save (cr);
emboss_context (cr);
draw_error_underline (cr,
(double)x / PANGO_SCALE, (double)y / PANGO_SCALE,
(double)width / PANGO_SCALE, (double)height / PANGO_SCALE);
cairo_restore (cr);
}
draw_error_underline (cr,
(double)x / PANGO_SCALE, (double)y / PANGO_SCALE,
(double)width / PANGO_SCALE, (double)height / PANGO_SCALE);
}
static void
gdk_pango_renderer_part_changed (PangoRenderer *renderer,
PangoRenderPart part)
{
GdkPangoRenderer *gdk_renderer = GDK_PANGO_RENDERER (renderer);
if (gdk_renderer->priv->last_part == part)
gdk_renderer->priv->last_part = (PangoRenderPart)-1;
}
static void
gdk_pango_renderer_begin (PangoRenderer *renderer)
{
GdkPangoRenderer *gdk_renderer = GDK_PANGO_RENDERER (renderer);
GdkPangoRendererPrivate *priv = gdk_renderer->priv;
if (!priv->drawable || !priv->base_gc)
{
g_warning ("gdk_pango_renderer_set_drawable() and gdk_pango_renderer_set_drawable()"
"must be used to set the target drawable and GC before using the renderer\n");
}
}
static void
gdk_pango_renderer_end (PangoRenderer *renderer)
{
GdkPangoRenderer *gdk_renderer = GDK_PANGO_RENDERER (renderer);
GdkPangoRendererPrivate *priv = gdk_renderer->priv;
if (priv->cr)
{
cairo_destroy (priv->cr);
priv->cr = NULL;
}
priv->last_part = (PangoRenderPart)-1;
}
static void
gdk_pango_renderer_prepare_run (PangoRenderer *renderer,
PangoLayoutRun *run)
{
GdkPangoRenderer *gdk_renderer = GDK_PANGO_RENDERER (renderer);
gboolean embossed = FALSE;
GdkBitmap *stipple = NULL;
GSList *l;
int i;
embossed = FALSE;
stipple = NULL;
for (l = run->item->analysis.extra_attrs; l; l = l->next)
{
PangoAttribute *attr = l->data;
/* stipple_type and embossed_type aren't necessarily
* initialized, but they are 0, which is an
* invalid type so won't occur.
*/
if (attr->klass->type == gdk_pango_attr_stipple_type)
{
stipple = ((GdkPangoAttrStipple*)attr)->stipple;
}
else if (attr->klass->type == gdk_pango_attr_embossed_type)
{
embossed = ((GdkPangoAttrEmbossed*)attr)->embossed;
}
}
gdk_pango_renderer_set_stipple (gdk_renderer, PANGO_RENDER_PART_FOREGROUND, stipple);
gdk_pango_renderer_set_stipple (gdk_renderer, PANGO_RENDER_PART_BACKGROUND, stipple);
gdk_pango_renderer_set_stipple (gdk_renderer, PANGO_RENDER_PART_UNDERLINE, stipple);
gdk_pango_renderer_set_stipple (gdk_renderer, PANGO_RENDER_PART_STRIKETHROUGH, stipple);
if (embossed != gdk_renderer->priv->embossed)
{
gdk_renderer->priv->embossed = embossed;
pango_renderer_part_changed (renderer, PANGO_RENDER_PART_FOREGROUND);
}
PANGO_RENDERER_CLASS (gdk_pango_renderer_parent_class)->prepare_run (renderer, run);
for (i = 0; i <= MAX_RENDER_PART; i++)
{
if (gdk_renderer->priv->override_color_set[i])
pango_renderer_set_color (renderer, i, &gdk_renderer->priv->override_color[i]);
}
}
static void
gdk_pango_renderer_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GdkPangoRenderer *gdk_renderer = GDK_PANGO_RENDERER (object);
switch (prop_id)
{
case PROP_SCREEN:
gdk_renderer->priv->screen = g_value_get_object (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gdk_pango_renderer_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GdkPangoRenderer *gdk_renderer = GDK_PANGO_RENDERER (object);
switch (prop_id)
{
case PROP_SCREEN:
g_value_set_object (value, gdk_renderer->priv->screen);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gdk_pango_renderer_init (GdkPangoRenderer *renderer)
{
renderer->priv = G_TYPE_INSTANCE_GET_PRIVATE (renderer,
GDK_TYPE_PANGO_RENDERER,
GdkPangoRendererPrivate);
renderer->priv->last_part = (PangoRenderPart)-1;
renderer->priv->gc_changed = TRUE;
}
static void
gdk_pango_renderer_class_init (GdkPangoRendererClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
PangoRendererClass *renderer_class = PANGO_RENDERER_CLASS (klass);
renderer_class->draw_glyphs = gdk_pango_renderer_draw_glyphs;
renderer_class->draw_rectangle = gdk_pango_renderer_draw_rectangle;
renderer_class->draw_error_underline = gdk_pango_renderer_draw_error_underline;
renderer_class->part_changed = gdk_pango_renderer_part_changed;
renderer_class->begin = gdk_pango_renderer_begin;
renderer_class->end = gdk_pango_renderer_end;
renderer_class->prepare_run = gdk_pango_renderer_prepare_run;
object_class->finalize = gdk_pango_renderer_finalize;
object_class->constructor = gdk_pango_renderer_constructor;
object_class->set_property = gdk_pango_renderer_set_property;
object_class->get_property = gdk_pango_renderer_get_property;
g_object_class_install_property (object_class,
PROP_SCREEN,
g_param_spec_object ("screen",
P_("Screen"),
P_("the GdkScreen for the renderer"),
GDK_TYPE_SCREEN,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_NAME | G_PARAM_STATIC_NICK |
G_PARAM_STATIC_BLURB));
g_type_class_add_private (object_class, sizeof (GdkPangoRendererPrivate));
}
/**
* gdk_pango_renderer_new:
* @screen: a #GdkScreen
*
* Creates a new #PangoRenderer for @screen. Normally you can use the
* results of gdk_pango_renderer_get_default() rather than creating a new
* renderer.
*
* Return value: a newly created #PangoRenderer. Free with g_object_unref().
*
* Since: 2.6
**/
PangoRenderer *
gdk_pango_renderer_new (GdkScreen *screen)
{
g_return_val_if_fail (screen != NULL, NULL);
return g_object_new (GDK_TYPE_PANGO_RENDERER,
"screen", screen,
NULL);
}
static void
on_renderer_display_closed (GdkDisplay *display,
gboolean is_error,
GdkPangoRenderer *renderer)
{
g_signal_handlers_disconnect_by_func (display,
on_renderer_display_closed,
renderer);
g_object_set_data (G_OBJECT (renderer->priv->screen),
g_intern_static_string ("gdk-pango-renderer"), NULL);
}
/**
* gdk_pango_renderer_get_default:
* @screen: a #GdkScreen
*
* Gets the default #PangoRenderer for a screen. This default renderer
* is shared by all users of the display, so properties such as the color
* or transformation matrix set for the renderer may be overwritten
* by functions such as gdk_draw_layout().
*
* Before using the renderer, you need to call gdk_pango_renderer_set_drawable()
* and gdk_pango_renderer_set_gc() to set the drawable and graphics context
* to use for drawing.
*
* Return value: the default #PangoRenderer for @screen. The
* renderer is owned by GTK+ and will be kept around until the
* screen is closed.
*
* Since: 2.6
**/
PangoRenderer *
gdk_pango_renderer_get_default (GdkScreen *screen)
{
PangoRenderer *renderer;
g_return_val_if_fail (GDK_IS_SCREEN (screen), NULL);
renderer = g_object_get_data (G_OBJECT (screen), "gdk-pango-renderer");
if (!renderer)
{
renderer = gdk_pango_renderer_new (screen);
g_object_set_data_full (G_OBJECT (screen),
g_intern_static_string ("gdk-pango-renderer"), renderer,
(GDestroyNotify)g_object_unref);
g_signal_connect (gdk_screen_get_display (screen), "closed",
G_CALLBACK (on_renderer_display_closed), renderer);
}
return renderer;
}
/**
* gdk_pango_renderer_set_drawable:
* @gdk_renderer: a #GdkPangoRenderer
* @drawable: the new target drawable, or %NULL
*
* Sets the drawable the renderer draws to.
*
* Since: 2.6
**/
void
gdk_pango_renderer_set_drawable (GdkPangoRenderer *gdk_renderer,
GdkDrawable *drawable)
{
GdkPangoRendererPrivate *priv;
g_return_if_fail (GDK_IS_PANGO_RENDERER (gdk_renderer));
g_return_if_fail (drawable == NULL || GDK_IS_DRAWABLE (drawable));
priv = gdk_renderer->priv;
if (priv->drawable != drawable)
{
if (priv->drawable)
g_object_unref (priv->drawable);
priv->drawable = drawable;
if (priv->drawable)
g_object_ref (priv->drawable);
}
}
/**
* gdk_pango_renderer_set_gc:
* @gdk_renderer: a #GdkPangoRenderer
* @gc: the new GC to use for drawing, or %NULL
*
* Sets the GC the renderer draws with. Note that the GC must not be
* modified until it is unset by calling the function again with
* %NULL for the @gc parameter, since GDK may make internal copies
* of the GC which won't be updated to follow changes to the
* original GC.
*
* Since: 2.6
**/
void
gdk_pango_renderer_set_gc (GdkPangoRenderer *gdk_renderer,
GdkGC *gc)
{
GdkPangoRendererPrivate *priv;
g_return_if_fail (GDK_IS_PANGO_RENDERER (gdk_renderer));
g_return_if_fail (gc == NULL || GDK_IS_GC (gc));
priv = gdk_renderer->priv;
if (priv->base_gc != gc)
{
if (priv->base_gc)
g_object_unref (priv->base_gc);
priv->base_gc = gc;
if (priv->base_gc)
g_object_ref (priv->base_gc);
priv->gc_changed = TRUE;
}
}
/**
* gdk_pango_renderer_set_stipple:
* @gdk_renderer: a #GdkPangoRenderer
* @part: the part to render with the stipple
* @stipple: the new stipple value.
*
* Sets the stipple for one render part (foreground, background, underline,
* etc.) Note that this is overwritten when iterating through the individual
* styled runs of a #PangoLayout or #PangoLayoutLine. This function is thus
* only useful when you call low level functions like pango_renderer_draw_glyphs()
* directly, or in the 'prepare_run' virtual function of a subclass of
* #GdkPangoRenderer.
*
* Since: 2.6
**/
void
gdk_pango_renderer_set_stipple (GdkPangoRenderer *gdk_renderer,
PangoRenderPart part,
GdkBitmap *stipple)
{
g_return_if_fail (GDK_IS_PANGO_RENDERER (gdk_renderer));
if (part > MAX_RENDER_PART) /* Silently ignore unknown parts */
return;
if (stipple != gdk_renderer->priv->stipple[part])
{
if (gdk_renderer->priv->stipple[part])
g_object_unref (gdk_renderer->priv->stipple[part]);
gdk_renderer->priv->stipple[part] = stipple;
if (gdk_renderer->priv->stipple[part])
g_object_ref (gdk_renderer->priv->stipple[part]);
pango_renderer_part_changed (PANGO_RENDERER (gdk_renderer), part);
}
}
/**
* gdk_pango_renderer_set_override_color:
* @gdk_renderer: a #GdkPangoRenderer
* @part: the part to render to set the color of
* @color: the color to use, or %NULL to unset a previously
* set override color.
*
* Sets the color for a particular render part (foreground,
* background, underline, etc.), overriding any attributes on the layouts
* renderered with this renderer.
*
* Since: 2.6
**/
void
gdk_pango_renderer_set_override_color (GdkPangoRenderer *gdk_renderer,
PangoRenderPart part,
const GdkColor *color)
{
GdkPangoRendererPrivate *priv;
g_return_if_fail (GDK_IS_PANGO_RENDERER (gdk_renderer));
priv = gdk_renderer->priv;
if (part > MAX_RENDER_PART) /* Silently ignore unknown parts */
return;
if (color)
{
priv->override_color[part].red = color->red;
priv->override_color[part].green = color->green;
priv->override_color[part].blue = color->blue;
priv->override_color_set[part] = TRUE;
}
else
priv->override_color_set[part] = FALSE;
}
/**
* gdk_pango_context_set_colormap:
* @context: a #PangoContext
* @colormap: a #GdkColormap
*
* This function used to set the colormap to be used for drawing with
* @context. The colormap is now always derived from the graphics
* context used for drawing, so calling this function is no longer
* necessary.
**/
void
gdk_pango_context_set_colormap (PangoContext *context,
GdkColormap *colormap)
{
g_return_if_fail (PANGO_IS_CONTEXT (context));
g_return_if_fail (colormap == NULL || GDK_IS_COLORMAP (colormap));
}
/* Gets a renderer to draw with, setting the properties of the
* renderer and activating it. Note that since we activate the
* renderer here, the implicit setting of the matrix that
* pango_renderer_draw_layout_[line] normally do when they
* activate the renderer is suppressed. */
static PangoRenderer *
get_renderer (GdkDrawable *drawable,
GdkGC *gc,
const GdkColor *foreground,
const GdkColor *background)
{
GdkScreen *screen = gdk_drawable_get_screen (drawable);
PangoRenderer *renderer = gdk_pango_renderer_get_default (screen);
GdkPangoRenderer *gdk_renderer = GDK_PANGO_RENDERER (renderer);
gdk_pango_renderer_set_drawable (gdk_renderer, drawable);
gdk_pango_renderer_set_gc (gdk_renderer, gc);
gdk_pango_renderer_set_override_color (gdk_renderer,
PANGO_RENDER_PART_FOREGROUND,
foreground);
gdk_pango_renderer_set_override_color (gdk_renderer,
PANGO_RENDER_PART_UNDERLINE,
foreground);
gdk_pango_renderer_set_override_color (gdk_renderer,
PANGO_RENDER_PART_STRIKETHROUGH,
foreground);
gdk_pango_renderer_set_override_color (gdk_renderer,
PANGO_RENDER_PART_BACKGROUND,
background);
pango_renderer_activate (renderer);
return renderer;
}
/* Cleans up the renderer obtained with get_renderer() */
static void
release_renderer (PangoRenderer *renderer)
{
GdkPangoRenderer *gdk_renderer = GDK_PANGO_RENDERER (renderer);
pango_renderer_deactivate (renderer);
gdk_pango_renderer_set_override_color (gdk_renderer,
PANGO_RENDER_PART_FOREGROUND,
NULL);
gdk_pango_renderer_set_override_color (gdk_renderer,
PANGO_RENDER_PART_UNDERLINE,
NULL);
gdk_pango_renderer_set_override_color (gdk_renderer,
PANGO_RENDER_PART_STRIKETHROUGH,
NULL);
gdk_pango_renderer_set_override_color (gdk_renderer,
PANGO_RENDER_PART_BACKGROUND,
NULL);
gdk_pango_renderer_set_drawable (gdk_renderer, NULL);
gdk_pango_renderer_set_gc (gdk_renderer, NULL);
}
/**
* gdk_draw_layout_line_with_colors:
* @drawable: the drawable on which to draw the line
* @gc: base graphics to use
* @x: the x position of start of string (in pixels)
* @y: the y position of baseline (in pixels)
* @line: a #PangoLayoutLine
* @foreground: foreground override color, or %NULL for none
* @background: background override color, or %NULL for none
*
* Render a #PangoLayoutLine onto a #GdkDrawable, overriding the
* layout's normal colors with @foreground and/or @background.
* @foreground and @background need not be allocated.
*
* If the layout's #PangoContext has a transformation matrix set, then
* @x and @y specify the position of the left edge of the baseline
* (left is in before-tranform user coordinates) in after-transform
* device coordinates.
*/
void
gdk_draw_layout_line_with_colors (GdkDrawable *drawable,
GdkGC *gc,
gint x,
gint y,
PangoLayoutLine *line,
const GdkColor *foreground,
const GdkColor *background)
{
PangoRenderer *renderer;
const PangoMatrix *matrix;
g_return_if_fail (GDK_IS_DRAWABLE (drawable));
g_return_if_fail (GDK_IS_GC (gc));
g_return_if_fail (line != NULL);
renderer = get_renderer (drawable, gc, foreground, background);
/* When we have a matrix, we do positioning by adjusting the matrix, and
* clamp just pass x=0, y=0 to the lower levels. We don't want to introduce
* a matrix when the caller didn't provide one, however, since that adds
* lots of floating point arithmetic for each glyph.
*/
matrix = pango_context_get_matrix (pango_layout_get_context (line->layout));
if (matrix)
{
PangoMatrix tmp_matrix;
tmp_matrix = *matrix;
tmp_matrix.x0 = x;
tmp_matrix.y0 = y;
pango_renderer_set_matrix (renderer, &tmp_matrix);
x = 0;
y = 0;
}
else
pango_renderer_set_matrix (renderer, NULL);
pango_renderer_draw_layout_line (renderer, line, x * PANGO_SCALE, y * PANGO_SCALE);
release_renderer (renderer);
}
/* Gets the bounds of a layout in device coordinates. Note cut-and-paste
* between here and gtklabel.c */
static void
get_rotated_layout_bounds (PangoLayout *layout,
GdkRectangle *rect)
{
PangoContext *context = pango_layout_get_context (layout);
const PangoMatrix *matrix = pango_context_get_matrix (context);
gdouble x_min = 0, x_max = 0, y_min = 0, y_max = 0; /* quiet gcc */
PangoRectangle logical_rect;
gint i, j;
pango_layout_get_extents (layout, NULL, &logical_rect);
for (i = 0; i < 2; i++)
{
gdouble x = (i == 0) ? logical_rect.x : logical_rect.x + logical_rect.width;
for (j = 0; j < 2; j++)
{
gdouble y = (j == 0) ? logical_rect.y : logical_rect.y + logical_rect.height;
gdouble xt = (x * matrix->xx + y * matrix->xy) / PANGO_SCALE + matrix->x0;
gdouble yt = (x * matrix->yx + y * matrix->yy) / PANGO_SCALE + matrix->y0;
if (i == 0 && j == 0)
{
x_min = x_max = xt;
y_min = y_max = yt;
}
else
{
if (xt < x_min)
x_min = xt;
if (yt < y_min)
y_min = yt;
if (xt > x_max)
x_max = xt;
if (yt > y_max)
y_max = yt;
}
}
}
rect->x = floor (x_min);
rect->width = ceil (x_max) - rect->x;
rect->y = floor (y_min);
rect->height = floor (y_max) - rect->y;
}
/**
* gdk_draw_layout_with_colors:
* @drawable: the drawable on which to draw string
* @gc: base graphics context to use
* @x: the X position of the left of the layout (in pixels)
* @y: the Y position of the top of the layout (in pixels)
* @layout: a #PangoLayout
* @foreground: foreground override color, or %NULL for none
* @background: background override color, or %NULL for none
*
* Render a #PangoLayout onto a #GdkDrawable, overriding the
* layout's normal colors with @foreground and/or @background.
* @foreground and @background need not be allocated.
*
* If the layout's #PangoContext has a transformation matrix set, then
* @x and @y specify the position of the top left corner of the
* bounding box (in device space) of the transformed layout.
*
* If you're using GTK+, the ususal way to obtain a #PangoLayout
* is gtk_widget_create_pango_layout().
*/
void
gdk_draw_layout_with_colors (GdkDrawable *drawable,
GdkGC *gc,
int x,
int y,
PangoLayout *layout,
const GdkColor *foreground,
const GdkColor *background)
{
PangoRenderer *renderer;
const PangoMatrix *matrix;
g_return_if_fail (GDK_IS_DRAWABLE (drawable));
g_return_if_fail (GDK_IS_GC (gc));
g_return_if_fail (PANGO_IS_LAYOUT (layout));
renderer = get_renderer (drawable, gc, foreground, background);
/* When we have a matrix, we do positioning by adjusting the matrix, and
* clamp just pass x=0, y=0 to the lower levels. We don't want to introduce
* a matrix when the caller didn't provide one, however, since that adds
* lots of floating point arithmetic for each glyph.
*/
matrix = pango_context_get_matrix (pango_layout_get_context (layout));
if (matrix)
{
PangoMatrix tmp_matrix;
GdkRectangle rect;
get_rotated_layout_bounds (layout, &rect);
tmp_matrix = *matrix;
tmp_matrix.x0 += x - rect.x;
tmp_matrix.y0 += y - rect.y;
pango_renderer_set_matrix (renderer, &tmp_matrix);
x = 0;
y = 0;
}
else
pango_renderer_set_matrix (renderer, NULL);
pango_renderer_draw_layout (renderer, layout, x * PANGO_SCALE, y * PANGO_SCALE);
release_renderer (renderer);
}
/**
* gdk_draw_layout_line:
* @drawable: the drawable on which to draw the line
* @gc: base graphics to use
* @x: the x position of start of string (in pixels)
* @y: the y position of baseline (in pixels)
* @line: a #PangoLayoutLine
*
* Render a #PangoLayoutLine onto an GDK drawable
*
* If the layout's #PangoContext has a transformation matrix set, then
* @x and @y specify the position of the left edge of the baseline
* (left is in before-tranform user coordinates) in after-transform
* device coordinates.
*/
void
gdk_draw_layout_line (GdkDrawable *drawable,
GdkGC *gc,
gint x,
gint y,
PangoLayoutLine *line)
{
g_return_if_fail (GDK_IS_DRAWABLE (drawable));
g_return_if_fail (GDK_IS_GC (gc));
g_return_if_fail (line != NULL);
gdk_draw_layout_line_with_colors (drawable, gc, x, y, line, NULL, NULL);
}
/**
* gdk_draw_layout:
* @drawable: the drawable on which to draw string
* @gc: base graphics context to use
* @x: the X position of the left of the layout (in pixels)
* @y: the Y position of the top of the layout (in pixels)
* @layout: a #PangoLayout
*
* Render a #PangoLayout onto a GDK drawable
*
* If the layout's #PangoContext has a transformation matrix set, then
* @x and @y specify the position of the top left corner of the
* bounding box (in device space) of the transformed layout.
*
* If you're using GTK+, the usual way to obtain a #PangoLayout
* is gtk_widget_create_pango_layout().
*/
void
gdk_draw_layout (GdkDrawable *drawable,
GdkGC *gc,
int x,
int y,
PangoLayout *layout)
{
g_return_if_fail (GDK_IS_DRAWABLE (drawable));
g_return_if_fail (GDK_IS_GC (gc));
g_return_if_fail (PANGO_IS_LAYOUT (layout));
gdk_draw_layout_with_colors (drawable, gc, x, y, layout, NULL, NULL);
}
static PangoAttribute *
gdk_pango_attr_stipple_copy (const PangoAttribute *attr)
{
const GdkPangoAttrStipple *src = (const GdkPangoAttrStipple*) attr;
return gdk_pango_attr_stipple_new (src->stipple);
}
static void
gdk_pango_attr_stipple_destroy (PangoAttribute *attr)
{
GdkPangoAttrStipple *st = (GdkPangoAttrStipple*) attr;
if (st->stipple)
g_object_unref (st->stipple);
g_free (attr);
}
static gboolean
gdk_pango_attr_stipple_compare (const PangoAttribute *attr1,
const PangoAttribute *attr2)
{
const GdkPangoAttrStipple *a = (const GdkPangoAttrStipple*) attr1;
const GdkPangoAttrStipple *b = (const GdkPangoAttrStipple*) attr2;
return a->stipple == b->stipple;
}
/**
* gdk_pango_attr_stipple_new:
* @stipple: a bitmap to be set as stipple
*
* Creates a new attribute containing a stipple bitmap to be used when
* rendering the text.
*
* Return value: new #PangoAttribute
**/
PangoAttribute *
gdk_pango_attr_stipple_new (GdkBitmap *stipple)
{
GdkPangoAttrStipple *result;
static PangoAttrClass klass = {
0,
gdk_pango_attr_stipple_copy,
gdk_pango_attr_stipple_destroy,
gdk_pango_attr_stipple_compare
};
if (!klass.type)
klass.type = gdk_pango_attr_stipple_type =
pango_attr_type_register ("GdkPangoAttrStipple");
result = g_new (GdkPangoAttrStipple, 1);
result->attr.klass = &klass;
if (stipple)
g_object_ref (stipple);
result->stipple = stipple;
return (PangoAttribute *)result;
}
static PangoAttribute *
gdk_pango_attr_embossed_copy (const PangoAttribute *attr)
{
const GdkPangoAttrEmbossed *e = (const GdkPangoAttrEmbossed*) attr;
return gdk_pango_attr_embossed_new (e->embossed);
}
static void
gdk_pango_attr_embossed_destroy (PangoAttribute *attr)
{
g_free (attr);
}
static gboolean
gdk_pango_attr_embossed_compare (const PangoAttribute *attr1,
const PangoAttribute *attr2)
{
const GdkPangoAttrEmbossed *e1 = (const GdkPangoAttrEmbossed*) attr1;
const GdkPangoAttrEmbossed *e2 = (const GdkPangoAttrEmbossed*) attr2;
return e1->embossed == e2->embossed;
}
/**
* gdk_pango_attr_embossed_new:
* @embossed: a bitmap to be set as embossed
*
* Creates a new attribute containing a embossed bitmap to be used when
* rendering the text.
*
* Return value: new #PangoAttribute
**/
PangoAttribute *
gdk_pango_attr_embossed_new (gboolean embossed)
{
GdkPangoAttrEmbossed *result;
static PangoAttrClass klass = {
0,
gdk_pango_attr_embossed_copy,
gdk_pango_attr_embossed_destroy,
gdk_pango_attr_embossed_compare
};
if (!klass.type)
klass.type = gdk_pango_attr_embossed_type =
pango_attr_type_register ("GdkPangoAttrEmbossed");
result = g_new (GdkPangoAttrEmbossed, 1);
result->attr.klass = &klass;
result->embossed = embossed;
return (PangoAttribute *)result;
}
/* Get a clip region to draw only part of a layout. index_ranges
* contains alternating range starts/stops. The region is the
* region which contains the given ranges, i.e. if you draw with the
* region as clip, only the given ranges are drawn.
*/
static GdkRegion*
layout_iter_get_line_clip_region (PangoLayoutIter *iter,
gint x_origin,
gint y_origin,
gint *index_ranges,
gint n_ranges)
{
PangoLayoutLine *line;
GdkRegion *clip_region;
PangoRectangle logical_rect;
gint baseline;
gint i;
line = pango_layout_iter_get_line (iter);
clip_region = gdk_region_new ();
pango_layout_iter_get_line_extents (iter, NULL, &logical_rect);
baseline = pango_layout_iter_get_baseline (iter);
i = 0;
while (i < n_ranges)
{
gint *pixel_ranges = NULL;
gint n_pixel_ranges = 0;
gint j;
/* Note that get_x_ranges returns layout coordinates
*/
if (index_ranges[i*2+1] >= line->start_index &&
index_ranges[i*2] < line->start_index + line->length)
pango_layout_line_get_x_ranges (line,
index_ranges[i*2],
index_ranges[i*2+1],
&pixel_ranges, &n_pixel_ranges);
for (j = 0; j < n_pixel_ranges; j++)
{
GdkRectangle rect;
int x_off, y_off;
x_off = PANGO_PIXELS (pixel_ranges[2*j] - logical_rect.x);
y_off = PANGO_PIXELS (baseline - logical_rect.y);
rect.x = x_origin + x_off;
rect.y = y_origin - y_off;
rect.width = PANGO_PIXELS (pixel_ranges[2*j + 1] - logical_rect.x) - x_off;
rect.height = PANGO_PIXELS (baseline - logical_rect.y + logical_rect.height) - y_off;
gdk_region_union_with_rect (clip_region, &rect);
}
g_free (pixel_ranges);
++i;
}
return clip_region;
}
/**
* gdk_pango_layout_line_get_clip_region:
* @line: a #PangoLayoutLine
* @x_origin: X pixel where you intend to draw the layout line with this clip
* @y_origin: baseline pixel where you intend to draw the layout line with this clip
* @index_ranges: array of byte indexes into the layout, where even members of array are start indexes and odd elements are end indexes
* @n_ranges: number of ranges in @index_ranges, i.e. half the size of @index_ranges
*
* Obtains a clip region which contains the areas where the given
* ranges of text would be drawn. @x_origin and @y_origin are the same
* position you would pass to gdk_draw_layout_line(). @index_ranges
* should contain ranges of bytes in the layout's text. The clip
* region will include space to the left or right of the line (to the
* layout bounding box) if you have indexes above or below the indexes
* contained inside the line. This is to draw the selection all the way
* to the side of the layout. However, the clip region is in line coordinates,
* not layout coordinates.
*
* Note that the regions returned correspond to logical extents of the text
* ranges, not ink extents. So the drawn line may in fact touch areas out of
* the clip region. The clip region is mainly useful for highlightling parts
* of text, such as when text is selected.
*
* Return value: a clip region containing the given ranges
**/
GdkRegion*
gdk_pango_layout_line_get_clip_region (PangoLayoutLine *line,
gint x_origin,
gint y_origin,
gint *index_ranges,
gint n_ranges)
{
GdkRegion *clip_region;
PangoLayoutIter *iter;
g_return_val_if_fail (line != NULL, NULL);
g_return_val_if_fail (index_ranges != NULL, NULL);
iter = pango_layout_get_iter (line->layout);
while (pango_layout_iter_get_line (iter) != line)
pango_layout_iter_next_line (iter);
clip_region = layout_iter_get_line_clip_region(iter, x_origin, y_origin, index_ranges, n_ranges);
pango_layout_iter_free (iter);
return clip_region;
}
/**
* gdk_pango_layout_get_clip_region:
* @layout: a #PangoLayout
* @x_origin: X pixel where you intend to draw the layout with this clip
* @y_origin: Y pixel where you intend to draw the layout with this clip
* @index_ranges: array of byte indexes into the layout, where even members of array are start indexes and odd elements are end indexes
* @n_ranges: number of ranges in @index_ranges, i.e. half the size of @index_ranges
*
* Obtains a clip region which contains the areas where the given ranges
* of text would be drawn. @x_origin and @y_origin are the same position
* you would pass to gdk_draw_layout_line(). @index_ranges should contain
* ranges of bytes in the layout's text.
*
* Note that the regions returned correspond to logical extents of the text
* ranges, not ink extents. So the drawn layout may in fact touch areas out of
* the clip region. The clip region is mainly useful for highlightling parts
* of text, such as when text is selected.
*
* Return value: a clip region containing the given ranges
**/
GdkRegion*
gdk_pango_layout_get_clip_region (PangoLayout *layout,
gint x_origin,
gint y_origin,
gint *index_ranges,
gint n_ranges)
{
PangoLayoutIter *iter;
GdkRegion *clip_region;
g_return_val_if_fail (PANGO_IS_LAYOUT (layout), NULL);
g_return_val_if_fail (index_ranges != NULL, NULL);
clip_region = gdk_region_new ();
iter = pango_layout_get_iter (layout);
do
{
PangoRectangle logical_rect;
PangoLayoutLine *line;
GdkRegion *line_region;
gint baseline;
pango_layout_iter_get_line_extents (iter, NULL, &logical_rect);
baseline = pango_layout_iter_get_baseline (iter);
line_region = layout_iter_get_line_clip_region(iter,
x_origin + logical_rect.x / PANGO_SCALE,
y_origin + baseline / PANGO_SCALE,
index_ranges,
n_ranges);
gdk_region_union (clip_region, line_region);
gdk_region_destroy (line_region);
}
while (pango_layout_iter_next_line (iter));
pango_layout_iter_free (iter);
return clip_region;
}
/**
* gdk_pango_context_get:
*
* Creates a #PangoContext for the default GDK screen.
*
* The context must be freed when you're finished with it.
*
* When using GTK+, normally you should use gtk_widget_get_pango_context()
* instead of this function, to get the appropriate context for
* the widget you intend to render text onto.
*
* The newly created context will have the default font options (see
* #cairo_font_options_t) for the default screen; if these options
* change it will not be updated. Using gtk_widget_get_pango_context()
* is more convenient if you want to keep a context around and track
* changes to the screen's font rendering settings.
*
* Return value: a new #PangoContext for the default display
**/
PangoContext *
gdk_pango_context_get (void)
{
return gdk_pango_context_get_for_screen (gdk_screen_get_default ());
}
/**
* gdk_pango_context_get_for_screen:
* @screen: the #GdkScreen for which the context is to be created.
*
* Creates a #PangoContext for @screen.
*
* The context must be freed when you're finished with it.
*
* When using GTK+, normally you should use gtk_widget_get_pango_context()
* instead of this function, to get the appropriate context for
* the widget you intend to render text onto.
*
* The newly created context will have the default font options
* (see #cairo_font_options_t) for the screen; if these options
* change it will not be updated. Using gtk_widget_get_pango_context()
* is more convenient if you want to keep a context around and track
* changes to the screen's font rendering settings.
*
* Return value: a new #PangoContext for @screen
*
* Since: 2.2
**/
PangoContext *
gdk_pango_context_get_for_screen (GdkScreen *screen)
{
PangoFontMap *fontmap;
PangoContext *context;
const cairo_font_options_t *options;
double dpi;
g_return_val_if_fail (GDK_IS_SCREEN (screen), NULL);
fontmap = pango_cairo_font_map_get_default ();
context = pango_cairo_font_map_create_context (PANGO_CAIRO_FONT_MAP (fontmap));
options = gdk_screen_get_font_options (screen);
pango_cairo_context_set_font_options (context, options);
dpi = gdk_screen_get_resolution (screen);
pango_cairo_context_set_resolution (context, dpi);
return context;
}
#define __GDK_PANGO_C__
#include "gdkaliasdef.c"
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