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gtk2/gdk/gdkpango.c
Alexander Larsson eabac453e6 Initial client-side-windows work 
The history before this was kind of twisted as several different
approaches were tested, so that was all squashed into this initial
commit to hide the uninteresting changes and files that were later
removed.
2009-04-02 10:14:01 +02:00

1502 lines
44 KiB
C
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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 "gdkintl.h"
#include "gdkalias.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];
PangoColor emboss_color;
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;
static PangoAttrType gdk_pango_attr_emboss_color_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 (GdkPangoRenderer *renderer, cairo_t *cr)
{
GdkPangoRendererPrivate *priv = renderer->priv;
cairo_matrix_t tmp_matrix;
double red, green, blue;
/* 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);
red = (double) priv->emboss_color.red / 65535.;
green = (double) priv->emboss_color.green / 65535.;
blue = (double) priv->emboss_color.blue / 65535.;
cairo_set_source_rgb (cr, red, green, blue);
}
static inline gboolean
color_equal (const PangoColor *c1, const 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->drawable);
}
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 (gdk_renderer, 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);
}
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 (gdk_renderer, 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 (gdk_renderer, cr);
pango_cairo_show_error_underline (cr,
(double)x / PANGO_SCALE, (double)y / PANGO_SCALE,
(double)width / PANGO_SCALE, (double)height / PANGO_SCALE);
cairo_restore (cr);
}
pango_cairo_show_error_underline (cr,
(double)x / PANGO_SCALE, (double)y / PANGO_SCALE,
(double)width / PANGO_SCALE, (double)height / PANGO_SCALE);
}
static void
gdk_pango_renderer_draw_shape (PangoRenderer *renderer,
PangoAttrShape *attr,
int x,
int y)
{
GdkPangoRenderer *gdk_renderer = GDK_PANGO_RENDERER (renderer);
GdkPangoRendererPrivate *priv = gdk_renderer->priv;
PangoLayout *layout;
PangoCairoShapeRendererFunc shape_renderer;
gpointer shape_renderer_data;
cairo_t *cr;
double dx = (double)x / PANGO_SCALE, dy = (double)y / PANGO_SCALE;
layout = pango_renderer_get_layout (renderer);
if (!layout)
return;
shape_renderer = pango_cairo_context_get_shape_renderer (pango_layout_get_context (layout),
&shape_renderer_data);
if (!shape_renderer)
return;
cr = get_cairo_context (gdk_renderer, PANGO_RENDER_PART_FOREGROUND);
cairo_save (cr);
if (priv->embossed)
{
cairo_save (cr);
emboss_context (gdk_renderer, cr);
cairo_move_to (cr, dx, dy);
shape_renderer (cr, attr, FALSE, shape_renderer_data);
cairo_restore (cr);
}
cairo_move_to (cr, dx, dy);
shape_renderer (cr, attr, FALSE, shape_renderer_data);
cairo_restore (cr);
}
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;
gboolean changed = FALSE;
PangoColor emboss_color;
GSList *l;
int i;
emboss_color.red = 0xffff;
emboss_color.green = 0xffff;
emboss_color.blue = 0xffff;
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;
}
else if (attr->klass->type == gdk_pango_attr_emboss_color_type)
{
emboss_color = ((GdkPangoAttrEmbossColor*)attr)->color;
}
}
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;
changed = TRUE;
}
if (!color_equal (&gdk_renderer->priv->emboss_color, &emboss_color))
{
gdk_renderer->priv->emboss_color = emboss_color;
changed = TRUE;
}
if (changed)
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->draw_shape = gdk_pango_renderer_draw_shape;
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;
}
/* Fall back to introduce a matrix if the coords would scale out of range.
* The x and y here will be added to in-layout coordinates. So we cannot
* support the entire range here safely. So, we just accept the middle half
* and use fallback for the rest. */
else if (GDK_PANGO_UNITS_OVERFLOWS (x, y))
{
PangoMatrix tmp_matrix = PANGO_MATRIX_INIT;
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);
}
/**
* 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;
PangoRectangle rect;
pango_layout_get_extents (layout, NULL, &rect);
pango_matrix_transform_rectangle (matrix, &rect);
pango_extents_to_pixels (&rect, NULL);
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 if (GDK_PANGO_UNITS_OVERFLOWS (x, y))
{
PangoMatrix tmp_matrix = PANGO_MATRIX_INIT;
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 (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);
}
/* GdkPangoAttrStipple */
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;
}
/* GdkPangoAttrEmbossed */
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: if the region should be embossed
*
* Creates a new attribute flagging a region as embossed or not.
*
* 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;
}
/* GdkPangoAttrEmbossColor */
static PangoAttribute *
gdk_pango_attr_emboss_color_copy (const PangoAttribute *attr)
{
const GdkPangoAttrEmbossColor *old = (const GdkPangoAttrEmbossColor*) attr;
GdkPangoAttrEmbossColor *copy;
copy = g_new (GdkPangoAttrEmbossColor, 1);
copy->attr.klass = old->attr.klass;
copy->color = old->color;
return (PangoAttribute *) copy;
}
static void
gdk_pango_attr_emboss_color_destroy (PangoAttribute *attr)
{
g_free (attr);
}
static gboolean
gdk_pango_attr_emboss_color_compare (const PangoAttribute *attr1,
const PangoAttribute *attr2)
{
const GdkPangoAttrEmbossColor *c1 = (const GdkPangoAttrEmbossColor*) attr1;
const GdkPangoAttrEmbossColor *c2 = (const GdkPangoAttrEmbossColor*) attr2;
return color_equal (&c1->color, &c2->color);
}
/**
* gdk_pango_attr_emboss_color_new:
* @color: a GdkColor representing the color to emboss with
*
* Creates a new attribute specifying the color to emboss text with.
*
* Return value: new #PangoAttribute
*
* Since: 2.12
**/
PangoAttribute *
gdk_pango_attr_emboss_color_new (const GdkColor *color)
{
GdkPangoAttrEmbossColor *result;
static PangoAttrClass klass = {
0,
gdk_pango_attr_emboss_color_copy,
gdk_pango_attr_emboss_color_destroy,
gdk_pango_attr_emboss_color_compare
};
if (!klass.type)
klass.type = gdk_pango_attr_emboss_color_type =
pango_attr_type_register ("GdkPangoAttrEmbossColor");
result = g_new (GdkPangoAttrEmbossColor, 1);
result->attr.klass = &klass;
result->color.red = color->red;
result->color.green = color->green;
result->color.blue = color->blue;
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,
const gint *index_ranges,
gint n_ranges)
{
PangoLayoutLine *line;
GdkRegion *clip_region;
PangoRectangle logical_rect;
gint baseline;
gint i;
line = pango_layout_iter_get_line_readonly (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,
const 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_readonly (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,
const 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;
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 + PANGO_PIXELS (logical_rect.x),
y_origin + PANGO_PIXELS (baseline),
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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