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gtk2/gdk/gdkgc.c
Benjamin Otte 331d77f3d7 gdkgc: Draw clip mask with Cairo
2010-07-26 16:42:49 +02:00

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/* GDK - The GIMP Drawing Kit
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* 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.
*/
/*
* Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
* file for a list of people on the GTK+ Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
*/
#include "config.h"
#include <string.h>
#include "gdkcairo.h"
#include "gdkgc.h"
#include "gdkinternals.h"
#include "gdkpixmap.h"
#include "gdkrgb.h"
#include "gdkprivate.h"
static void gdk_gc_finalize (GObject *object);
typedef struct _GdkGCPrivate GdkGCPrivate;
struct _GdkGCPrivate
{
cairo_region_t *clip_region;
guint32 region_tag_applied;
int region_tag_offset_x;
int region_tag_offset_y;
cairo_region_t *old_clip_region;
GdkPixmap *old_clip_mask;
GdkBitmap *stipple;
GdkPixmap *tile;
GdkPixmap *clip_mask;
guint32 fg_pixel;
guint32 bg_pixel;
guint subwindow_mode : 1;
guint fill : 2;
guint exposures : 2;
};
#define GDK_GC_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), GDK_TYPE_GC, GdkGCPrivate))
G_DEFINE_TYPE (GdkGC, gdk_gc, G_TYPE_OBJECT)
static void
gdk_gc_class_init (GdkGCClass *class)
{
GObjectClass *object_class = G_OBJECT_CLASS (class);
object_class->finalize = gdk_gc_finalize;
g_type_class_add_private (object_class, sizeof (GdkGCPrivate));
}
static void
gdk_gc_init (GdkGC *gc)
{
GdkGCPrivate *priv = GDK_GC_GET_PRIVATE (gc);
priv->fill = GDK_SOLID;
/* These are the default X11 value, which we match. They are clearly
* wrong for TrueColor displays, so apps have to change them.
*/
priv->fg_pixel = 0;
priv->bg_pixel = 1;
}
/**
* gdk_gc_new:
* @drawable: a #GdkDrawable. The created GC must always be used
* with drawables of the same depth as this one.
*
* Create a new graphics context with default values.
*
* Returns: the new graphics context.
**/
GdkGC*
gdk_gc_new (GdkDrawable *drawable)
{
g_return_val_if_fail (drawable != NULL, NULL);
return gdk_gc_new_with_values (drawable, NULL, 0);
}
/**
* gdk_gc_new_with_values:
* @drawable: a #GdkDrawable. The created GC must always be used
* with drawables of the same depth as this one.
* @values: a structure containing initial values for the GC.
* @values_mask: a bit mask indicating which fields in @values
* are set.
*
* Create a new GC with the given initial values.
*
* Return value: the new graphics context.
**/
GdkGC*
gdk_gc_new_with_values (GdkDrawable *drawable,
GdkGCValues *values,
GdkGCValuesMask values_mask)
{
g_return_val_if_fail (drawable != NULL, NULL);
return GDK_DRAWABLE_GET_CLASS (drawable)->create_gc (drawable,
values,
values_mask);
}
/**
* _gdk_gc_init:
* @gc: a #GdkGC
* @drawable: a #GdkDrawable.
* @values: a structure containing initial values for the GC.
* @values_mask: a bit mask indicating which fields in @values
* are set.
*
* Does initialization of the generic portions of a #GdkGC
* created with the specified values and values_mask. This
* should be called out of the implementation of
* GdkDrawable.create_gc() immediately after creating the
* #GdkGC object.
**/
void
_gdk_gc_init (GdkGC *gc,
GdkDrawable *drawable,
GdkGCValues *values,
GdkGCValuesMask values_mask)
{
GdkGCPrivate *priv;
g_return_if_fail (GDK_IS_GC (gc));
priv = GDK_GC_GET_PRIVATE (gc);
if (values_mask & GDK_GC_CLIP_X_ORIGIN)
gc->clip_x_origin = values->clip_x_origin;
if (values_mask & GDK_GC_CLIP_Y_ORIGIN)
gc->clip_y_origin = values->clip_y_origin;
if ((values_mask & GDK_GC_CLIP_MASK) && values->clip_mask)
priv->clip_mask = g_object_ref (values->clip_mask);
if (values_mask & GDK_GC_TS_X_ORIGIN)
gc->ts_x_origin = values->ts_x_origin;
if (values_mask & GDK_GC_TS_Y_ORIGIN)
gc->ts_y_origin = values->ts_y_origin;
if (values_mask & GDK_GC_FILL)
priv->fill = values->fill;
if (values_mask & GDK_GC_STIPPLE)
{
priv->stipple = values->stipple;
if (priv->stipple)
g_object_ref (priv->stipple);
}
if (values_mask & GDK_GC_TILE)
{
priv->tile = values->tile;
if (priv->tile)
g_object_ref (priv->tile);
}
if (values_mask & GDK_GC_FOREGROUND)
priv->fg_pixel = values->foreground.pixel;
if (values_mask & GDK_GC_BACKGROUND)
priv->bg_pixel = values->background.pixel;
if (values_mask & GDK_GC_SUBWINDOW)
priv->subwindow_mode = values->subwindow_mode;
if (values_mask & GDK_GC_EXPOSURES)
priv->exposures = values->graphics_exposures;
else
priv->exposures = TRUE;
gc->colormap = gdk_drawable_get_colormap (drawable);
if (gc->colormap)
g_object_ref (gc->colormap);
}
static void
gdk_gc_finalize (GObject *object)
{
GdkGC *gc = GDK_GC (object);
GdkGCPrivate *priv = GDK_GC_GET_PRIVATE (gc);
if (priv->clip_region)
cairo_region_destroy (priv->clip_region);
if (priv->old_clip_region)
cairo_region_destroy (priv->old_clip_region);
if (priv->clip_mask)
g_object_unref (priv->clip_mask);
if (priv->old_clip_mask)
g_object_unref (priv->old_clip_mask);
if (gc->colormap)
g_object_unref (gc->colormap);
if (priv->tile)
g_object_unref (priv->tile);
if (priv->stipple)
g_object_unref (priv->stipple);
G_OBJECT_CLASS (gdk_gc_parent_class)->finalize (object);
}
/**
* gdk_gc_get_values:
* @gc: a #GdkGC.
* @values: the #GdkGCValues structure in which to store the results.
*
* Retrieves the current values from a graphics context. Note that
* only the pixel values of the @values->foreground and @values->background
* are filled, use gdk_colormap_query_color() to obtain the rgb values
* if you need them.
**/
void
gdk_gc_get_values (GdkGC *gc,
GdkGCValues *values)
{
g_return_if_fail (GDK_IS_GC (gc));
g_return_if_fail (values != NULL);
GDK_GC_GET_CLASS (gc)->get_values (gc, values);
}
/**
* gdk_gc_set_values:
* @gc: a #GdkGC
* @values: struct containing the new values
* @values_mask: mask indicating which struct fields are to be used
*
* Sets attributes of a graphics context in bulk. For each flag set in
* @values_mask, the corresponding field will be read from @values and
* set as the new value for @gc. If you're only setting a few values
* on @gc, calling individual "setter" functions is likely more
* convenient.
*
**/
void
gdk_gc_set_values (GdkGC *gc,
GdkGCValues *values,
GdkGCValuesMask values_mask)
{
GdkGCPrivate *priv;
g_return_if_fail (GDK_IS_GC (gc));
g_return_if_fail (values != NULL);
priv = GDK_GC_GET_PRIVATE (gc);
if ((values_mask & GDK_GC_CLIP_X_ORIGIN) ||
(values_mask & GDK_GC_CLIP_Y_ORIGIN) ||
(values_mask & GDK_GC_CLIP_MASK) ||
(values_mask & GDK_GC_SUBWINDOW))
_gdk_gc_remove_drawable_clip (gc);
if (values_mask & GDK_GC_CLIP_X_ORIGIN)
gc->clip_x_origin = values->clip_x_origin;
if (values_mask & GDK_GC_CLIP_Y_ORIGIN)
gc->clip_y_origin = values->clip_y_origin;
if (values_mask & GDK_GC_TS_X_ORIGIN)
gc->ts_x_origin = values->ts_x_origin;
if (values_mask & GDK_GC_TS_Y_ORIGIN)
gc->ts_y_origin = values->ts_y_origin;
if (values_mask & GDK_GC_CLIP_MASK)
{
if (priv->clip_mask)
{
g_object_unref (priv->clip_mask);
priv->clip_mask = NULL;
}
if (values->clip_mask)
priv->clip_mask = g_object_ref (values->clip_mask);
if (priv->clip_region)
{
cairo_region_destroy (priv->clip_region);
priv->clip_region = NULL;
}
}
if (values_mask & GDK_GC_FILL)
priv->fill = values->fill;
if (values_mask & GDK_GC_STIPPLE)
{
if (priv->stipple != values->stipple)
{
if (priv->stipple)
g_object_unref (priv->stipple);
priv->stipple = values->stipple;
if (priv->stipple)
g_object_ref (priv->stipple);
}
}
if (values_mask & GDK_GC_TILE)
{
if (priv->tile != values->tile)
{
if (priv->tile)
g_object_unref (priv->tile);
priv->tile = values->tile;
if (priv->tile)
g_object_ref (priv->tile);
}
}
if (values_mask & GDK_GC_FOREGROUND)
priv->fg_pixel = values->foreground.pixel;
if (values_mask & GDK_GC_BACKGROUND)
priv->bg_pixel = values->background.pixel;
if (values_mask & GDK_GC_SUBWINDOW)
priv->subwindow_mode = values->subwindow_mode;
if (values_mask & GDK_GC_EXPOSURES)
priv->exposures = values->graphics_exposures;
GDK_GC_GET_CLASS (gc)->set_values (gc, values, values_mask);
}
/**
* gdk_gc_set_foreground:
* @gc: a #GdkGC.
* @color: the new foreground color.
*
* Sets the foreground color for a graphics context.
* Note that this function uses @color->pixel, use
* gdk_gc_set_rgb_fg_color() to specify the foreground
* color as red, green, blue components.
**/
void
gdk_gc_set_foreground (GdkGC *gc,
const GdkColor *color)
{
GdkGCValues values;
g_return_if_fail (GDK_IS_GC (gc));
g_return_if_fail (color != NULL);
values.foreground = *color;
gdk_gc_set_values (gc, &values, GDK_GC_FOREGROUND);
}
/**
* gdk_gc_set_background:
* @gc: a #GdkGC.
* @color: the new background color.
*
* Sets the background color for a graphics context.
* Note that this function uses @color->pixel, use
* gdk_gc_set_rgb_bg_color() to specify the background
* color as red, green, blue components.
**/
void
gdk_gc_set_background (GdkGC *gc,
const GdkColor *color)
{
GdkGCValues values;
g_return_if_fail (GDK_IS_GC (gc));
g_return_if_fail (color != NULL);
values.background = *color;
gdk_gc_set_values (gc, &values, GDK_GC_BACKGROUND);
}
/**
* gdk_gc_set_function:
* @gc: a #GdkGC.
* @function: the #GdkFunction to use
*
* Determines how the current pixel values and the
* pixel values being drawn are combined to produce
* the final pixel values.
**/
void
gdk_gc_set_function (GdkGC *gc,
GdkFunction function)
{
GdkGCValues values;
g_return_if_fail (GDK_IS_GC (gc));
values.function = function;
gdk_gc_set_values (gc, &values, GDK_GC_FUNCTION);
}
/**
* gdk_gc_set_fill:
* @gc: a #GdkGC.
* @fill: the new fill mode.
*
* Set the fill mode for a graphics context.
**/
void
gdk_gc_set_fill (GdkGC *gc,
GdkFill fill)
{
GdkGCValues values;
g_return_if_fail (GDK_IS_GC (gc));
values.fill = fill;
gdk_gc_set_values (gc, &values, GDK_GC_FILL);
}
/**
* gdk_gc_set_tile:
* @gc: a #GdkGC.
* @tile: the new tile pixmap.
*
* Set a tile pixmap for a graphics context.
* This will only be used if the fill mode
* is %GDK_TILED.
**/
void
gdk_gc_set_tile (GdkGC *gc,
GdkPixmap *tile)
{
GdkGCValues values;
g_return_if_fail (GDK_IS_GC (gc));
values.tile = tile;
gdk_gc_set_values (gc, &values, GDK_GC_TILE);
}
/**
* gdk_gc_set_stipple:
* @gc: a #GdkGC.
* @stipple: the new stipple bitmap.
*
* Set the stipple bitmap for a graphics context. The
* stipple will only be used if the fill mode is
* %GDK_STIPPLED or %GDK_OPAQUE_STIPPLED.
**/
void
gdk_gc_set_stipple (GdkGC *gc,
GdkPixmap *stipple)
{
GdkGCValues values;
g_return_if_fail (GDK_IS_GC (gc));
values.stipple = stipple;
gdk_gc_set_values (gc, &values, GDK_GC_STIPPLE);
}
/**
* gdk_gc_set_ts_origin:
* @gc: a #GdkGC.
* @x: the x-coordinate of the origin.
* @y: the y-coordinate of the origin.
*
* Set the origin when using tiles or stipples with
* the GC. The tile or stipple will be aligned such
* that the upper left corner of the tile or stipple
* will coincide with this point.
**/
void
gdk_gc_set_ts_origin (GdkGC *gc,
gint x,
gint y)
{
GdkGCValues values;
g_return_if_fail (GDK_IS_GC (gc));
values.ts_x_origin = x;
values.ts_y_origin = y;
gdk_gc_set_values (gc, &values,
GDK_GC_TS_X_ORIGIN | GDK_GC_TS_Y_ORIGIN);
}
/**
* gdk_gc_set_clip_origin:
* @gc: a #GdkGC.
* @x: the x-coordinate of the origin.
* @y: the y-coordinate of the origin.
*
* Sets the origin of the clip mask. The coordinates are
* interpreted relative to the upper-left corner of
* the destination drawable of the current operation.
**/
void
gdk_gc_set_clip_origin (GdkGC *gc,
gint x,
gint y)
{
GdkGCValues values;
g_return_if_fail (GDK_IS_GC (gc));
values.clip_x_origin = x;
values.clip_y_origin = y;
gdk_gc_set_values (gc, &values,
GDK_GC_CLIP_X_ORIGIN | GDK_GC_CLIP_Y_ORIGIN);
}
/**
* gdk_gc_set_clip_mask:
* @gc: the #GdkGC.
* @mask: a bitmap.
*
* Sets the clip mask for a graphics context from a bitmap.
* The clip mask is interpreted relative to the clip
* origin. (See gdk_gc_set_clip_origin()).
**/
void
gdk_gc_set_clip_mask (GdkGC *gc,
GdkBitmap *mask)
{
GdkGCValues values;
g_return_if_fail (GDK_IS_GC (gc));
values.clip_mask = mask;
gdk_gc_set_values (gc, &values, GDK_GC_CLIP_MASK);
}
/* Takes ownership of passed in region */
static void
_gdk_gc_set_clip_region_real (GdkGC *gc,
cairo_region_t *region,
gboolean reset_origin)
{
GdkGCPrivate *priv = GDK_GC_GET_PRIVATE (gc);
if (priv->clip_mask)
{
g_object_unref (priv->clip_mask);
priv->clip_mask = NULL;
}
if (priv->clip_region)
cairo_region_destroy (priv->clip_region);
priv->clip_region = region;
_gdk_windowing_gc_set_clip_region (gc, region, reset_origin);
}
/* Doesn't copy region, allows not to reset origin */
void
_gdk_gc_set_clip_region_internal (GdkGC *gc,
cairo_region_t *region,
gboolean reset_origin)
{
_gdk_gc_remove_drawable_clip (gc);
_gdk_gc_set_clip_region_real (gc, region, reset_origin);
}
void
_gdk_gc_add_drawable_clip (GdkGC *gc,
guint32 region_tag,
cairo_region_t *region,
int offset_x,
int offset_y)
{
GdkGCPrivate *priv = GDK_GC_GET_PRIVATE (gc);
if (priv->region_tag_applied == region_tag &&
offset_x == priv->region_tag_offset_x &&
offset_y == priv->region_tag_offset_y)
return; /* Already appied this drawable region */
if (priv->region_tag_applied)
_gdk_gc_remove_drawable_clip (gc);
region = cairo_region_copy (region);
if (offset_x != 0 || offset_y != 0)
cairo_region_translate (region, offset_x, offset_y);
if (priv->clip_mask)
{
int w, h;
GdkPixmap *new_mask;
GdkGC *tmp_gc;
GdkColor black = {0, 0, 0, 0};
GdkRectangle r;
cairo_region_overlap_t overlap;
gdk_drawable_get_size (priv->clip_mask, &w, &h);
r.x = 0;
r.y = 0;
r.width = w;
r.height = h;
/* Its quite common to expose areas that are completely in or outside
* the region, so we try to avoid allocating bitmaps that are just fully
* set or completely unset.
*/
overlap = cairo_region_contains_rectangle (region, &r);
if (overlap == CAIRO_REGION_OVERLAP_PART)
{
cairo_t *cr;
/* The region and the mask intersect, create a new clip mask that
includes both areas */
priv->old_clip_mask = g_object_ref (priv->clip_mask);
new_mask = gdk_pixmap_new (priv->old_clip_mask, w, h, -1);
cr = gdk_cairo_create (new_mask);
cairo_set_operator (cr, CAIRO_OPERATOR_CLEAR);
cairo_paint (cr);
gdk_cairo_set_source_pixmap (cr, priv->old_clip_mask, 0, 0);
gdk_cairo_region (cr, region);
cairo_fill (cr);
cairo_destroy (cr);
cairo_region_destroy (region);
gdk_gc_set_clip_mask (gc, new_mask);
g_object_unref (new_mask);
}
else if (overlap == CAIRO_REGION_OVERLAP_OUT)
{
/* No intersection, set empty clip region */
cairo_region_t *empty = cairo_region_create ();
cairo_region_destroy (region);
priv->old_clip_mask = g_object_ref (priv->clip_mask);
priv->clip_region = empty;
_gdk_windowing_gc_set_clip_region (gc, empty, FALSE);
}
else
{
/* Completely inside region, don't set unnecessary clip */
cairo_region_destroy (region);
return;
}
}
else
{
priv->old_clip_region = priv->clip_region;
priv->clip_region = region;
if (priv->old_clip_region)
cairo_region_intersect (region, priv->old_clip_region);
_gdk_windowing_gc_set_clip_region (gc, priv->clip_region, FALSE);
}
priv->region_tag_applied = region_tag;
priv->region_tag_offset_x = offset_x;
priv->region_tag_offset_y = offset_y;
}
void
_gdk_gc_remove_drawable_clip (GdkGC *gc)
{
GdkGCPrivate *priv = GDK_GC_GET_PRIVATE (gc);
if (priv->region_tag_applied)
{
priv->region_tag_applied = 0;
if (priv->old_clip_mask)
{
gdk_gc_set_clip_mask (gc, priv->old_clip_mask);
g_object_unref (priv->old_clip_mask);
priv->old_clip_mask = NULL;
if (priv->clip_region)
{
g_object_unref (priv->clip_region);
priv->clip_region = NULL;
}
}
else
{
_gdk_gc_set_clip_region_real (gc, priv->old_clip_region, FALSE);
priv->old_clip_region = NULL;
}
}
}
/**
* gdk_gc_set_clip_rectangle:
* @gc: a #GdkGC.
* @rectangle: the rectangle to clip to.
*
* Sets the clip mask for a graphics context from a
* rectangle. The clip mask is interpreted relative to the clip
* origin. (See gdk_gc_set_clip_origin()).
**/
void
gdk_gc_set_clip_rectangle (GdkGC *gc,
const GdkRectangle *rectangle)
{
cairo_region_t *region;
g_return_if_fail (GDK_IS_GC (gc));
_gdk_gc_remove_drawable_clip (gc);
if (rectangle)
region = cairo_region_create_rectangle (rectangle);
else
region = NULL;
_gdk_gc_set_clip_region_real (gc, region, TRUE);
}
/**
* gdk_gc_set_clip_region:
* @gc: a #GdkGC.
* @region: the #cairo_region_t.
*
* Sets the clip mask for a graphics context from a region structure.
* The clip mask is interpreted relative to the clip origin. (See
* gdk_gc_set_clip_origin()).
**/
void
gdk_gc_set_clip_region (GdkGC *gc,
const cairo_region_t *region)
{
cairo_region_t *copy;
g_return_if_fail (GDK_IS_GC (gc));
_gdk_gc_remove_drawable_clip (gc);
if (region)
copy = cairo_region_copy (region);
else
copy = NULL;
_gdk_gc_set_clip_region_real (gc, copy, TRUE);
}
/**
* _gdk_gc_get_clip_region:
* @gc: a #GdkGC
*
* Gets the current clip region for @gc, if any.
*
* Return value: the clip region for the GC, or %NULL.
* (if a clip mask is set, the return will be %NULL)
* This value is owned by the GC and must not be freed.
**/
cairo_region_t *
_gdk_gc_get_clip_region (GdkGC *gc)
{
g_return_val_if_fail (GDK_IS_GC (gc), NULL);
return GDK_GC_GET_PRIVATE (gc)->clip_region;
}
/**
* _gdk_gc_get_clip_mask:
* @gc: a #GdkGC
*
* Gets the current clip mask for @gc, if any.
*
* Return value: the clip mask for the GC, or %NULL.
* (if a clip region is set, the return will be %NULL)
* This value is owned by the GC and must not be freed.
**/
GdkBitmap *
_gdk_gc_get_clip_mask (GdkGC *gc)
{
g_return_val_if_fail (GDK_IS_GC (gc), NULL);
return GDK_GC_GET_PRIVATE (gc)->clip_mask;
}
/**
* _gdk_gc_get_fill:
* @gc: a #GdkGC
*
* Gets the current file style for the GC
*
* Return value: the file style for the GC
**/
GdkFill
_gdk_gc_get_fill (GdkGC *gc)
{
g_return_val_if_fail (GDK_IS_GC (gc), GDK_SOLID);
return GDK_GC_GET_PRIVATE (gc)->fill;
}
gboolean
_gdk_gc_get_exposures (GdkGC *gc)
{
g_return_val_if_fail (GDK_IS_GC (gc), FALSE);
return GDK_GC_GET_PRIVATE (gc)->exposures;
}
/**
* _gdk_gc_get_tile:
* @gc: a #GdkGC
*
* Gets the tile pixmap for @gc, if any
*
* Return value: the tile set on the GC, or %NULL. The
* value is owned by the GC and must not be freed.
**/
GdkPixmap *
_gdk_gc_get_tile (GdkGC *gc)
{
g_return_val_if_fail (GDK_IS_GC (gc), NULL);
return GDK_GC_GET_PRIVATE (gc)->tile;
}
/**
* _gdk_gc_get_stipple:
* @gc: a #GdkGC
*
* Gets the stipple pixmap for @gc, if any
*
* Return value: the stipple set on the GC, or %NULL. The
* value is owned by the GC and must not be freed.
**/
GdkBitmap *
_gdk_gc_get_stipple (GdkGC *gc)
{
g_return_val_if_fail (GDK_IS_GC (gc), NULL);
return GDK_GC_GET_PRIVATE (gc)->stipple;
}
/**
* _gdk_gc_get_fg_pixel:
* @gc: a #GdkGC
*
* Gets the foreground pixel value for @gc. If the
* foreground pixel has never been set, returns the
* default value 0.
*
* Return value: the foreground pixel value of the GC
**/
guint32
_gdk_gc_get_fg_pixel (GdkGC *gc)
{
g_return_val_if_fail (GDK_IS_GC (gc), 0);
return GDK_GC_GET_PRIVATE (gc)->fg_pixel;
}
/**
* _gdk_gc_get_bg_pixel:
* @gc: a #GdkGC
*
* Gets the background pixel value for @gc.If the
* foreground pixel has never been set, returns the
* default value 1.
*
* Return value: the foreground pixel value of the GC
**/
guint32
_gdk_gc_get_bg_pixel (GdkGC *gc)
{
g_return_val_if_fail (GDK_IS_GC (gc), 0);
return GDK_GC_GET_PRIVATE (gc)->bg_pixel;
}
/**
* gdk_gc_set_subwindow:
* @gc: a #GdkGC.
* @mode: the subwindow mode.
*
* Sets how drawing with this GC on a window will affect child
* windows of that window.
**/
void
gdk_gc_set_subwindow (GdkGC *gc,
GdkSubwindowMode mode)
{
GdkGCValues values;
GdkGCPrivate *priv = GDK_GC_GET_PRIVATE (gc);
g_return_if_fail (GDK_IS_GC (gc));
/* This could get called a lot to reset the subwindow mode in
the client side clipping, so bail out early */
if (priv->subwindow_mode == mode)
return;
values.subwindow_mode = mode;
gdk_gc_set_values (gc, &values, GDK_GC_SUBWINDOW);
}
GdkSubwindowMode
_gdk_gc_get_subwindow (GdkGC *gc)
{
GdkGCPrivate *priv = GDK_GC_GET_PRIVATE (gc);
return priv->subwindow_mode;
}
/**
* gdk_gc_set_exposures:
* @gc: a #GdkGC.
* @exposures: if %TRUE, exposure events will be generated.
*
* Sets whether copying non-visible portions of a drawable
* using this graphics context generate exposure events
* for the corresponding regions of the destination
* drawable. (See gdk_draw_drawable()).
**/
void
gdk_gc_set_exposures (GdkGC *gc,
gboolean exposures)
{
GdkGCValues values;
g_return_if_fail (GDK_IS_GC (gc));
values.graphics_exposures = exposures;
gdk_gc_set_values (gc, &values, GDK_GC_EXPOSURES);
}
/**
* gdk_gc_set_line_attributes:
* @gc: a #GdkGC.
* @line_width: the width of lines.
* @line_style: the dash-style for lines.
* @cap_style: the manner in which the ends of lines are drawn.
* @join_style: the in which lines are joined together.
*
* Sets various attributes of how lines are drawn. See
* the corresponding members of #GdkGCValues for full
* explanations of the arguments.
**/
void
gdk_gc_set_line_attributes (GdkGC *gc,
gint line_width,
GdkLineStyle line_style,
GdkCapStyle cap_style,
GdkJoinStyle join_style)
{
GdkGCValues values;
values.line_width = line_width;
values.line_style = line_style;
values.cap_style = cap_style;
values.join_style = join_style;
gdk_gc_set_values (gc, &values,
GDK_GC_LINE_WIDTH |
GDK_GC_LINE_STYLE |
GDK_GC_CAP_STYLE |
GDK_GC_JOIN_STYLE);
}
/**
* gdk_gc_set_dashes:
* @gc: a #GdkGC.
* @dash_offset: the phase of the dash pattern.
* @dash_list: an array of dash lengths.
* @n: the number of elements in @dash_list.
*
* Sets the way dashed-lines are drawn. Lines will be
* drawn with alternating on and off segments of the
* lengths specified in @dash_list. The manner in
* which the on and off segments are drawn is determined
* by the @line_style value of the GC. (This can
* be changed with gdk_gc_set_line_attributes().)
*
* The @dash_offset defines the phase of the pattern,
* specifying how many pixels into the dash-list the pattern
* should actually begin.
**/
void
gdk_gc_set_dashes (GdkGC *gc,
gint dash_offset,
gint8 dash_list[],
gint n)
{
g_return_if_fail (GDK_IS_GC (gc));
g_return_if_fail (dash_list != NULL);
GDK_GC_GET_CLASS (gc)->set_dashes (gc, dash_offset, dash_list, n);
}
/**
* gdk_gc_offset:
* @gc: a #GdkGC
* @x_offset: amount by which to offset the GC in the X direction
* @y_offset: amount by which to offset the GC in the Y direction
*
* Offset attributes such as the clip and tile-stipple origins
* of the GC so that drawing at x - x_offset, y - y_offset with
* the offset GC has the same effect as drawing at x, y with the original
* GC.
**/
void
gdk_gc_offset (GdkGC *gc,
gint x_offset,
gint y_offset)
{
if (x_offset != 0 || y_offset != 0)
{
GdkGCValues values;
values.clip_x_origin = gc->clip_x_origin - x_offset;
values.clip_y_origin = gc->clip_y_origin - y_offset;
values.ts_x_origin = gc->ts_x_origin - x_offset;
values.ts_y_origin = gc->ts_y_origin - y_offset;
gdk_gc_set_values (gc, &values,
GDK_GC_CLIP_X_ORIGIN |
GDK_GC_CLIP_Y_ORIGIN |
GDK_GC_TS_X_ORIGIN |
GDK_GC_TS_Y_ORIGIN);
}
}
/**
* gdk_gc_copy:
* @dst_gc: the destination graphics context.
* @src_gc: the source graphics context.
*
* Copy the set of values from one graphics context
* onto another graphics context.
**/
void
gdk_gc_copy (GdkGC *dst_gc,
GdkGC *src_gc)
{
GdkGCPrivate *dst_priv, *src_priv;
g_return_if_fail (GDK_IS_GC (dst_gc));
g_return_if_fail (GDK_IS_GC (src_gc));
dst_priv = GDK_GC_GET_PRIVATE (dst_gc);
src_priv = GDK_GC_GET_PRIVATE (src_gc);
_gdk_windowing_gc_copy (dst_gc, src_gc);
dst_gc->clip_x_origin = src_gc->clip_x_origin;
dst_gc->clip_y_origin = src_gc->clip_y_origin;
dst_gc->ts_x_origin = src_gc->ts_x_origin;
dst_gc->ts_y_origin = src_gc->ts_y_origin;
if (src_gc->colormap)
g_object_ref (src_gc->colormap);
if (dst_gc->colormap)
g_object_unref (dst_gc->colormap);
dst_gc->colormap = src_gc->colormap;
if (dst_priv->clip_region)
cairo_region_destroy (dst_priv->clip_region);
if (src_priv->clip_region)
dst_priv->clip_region = cairo_region_copy (src_priv->clip_region);
else
dst_priv->clip_region = NULL;
dst_priv->region_tag_applied = src_priv->region_tag_applied;
if (dst_priv->old_clip_region)
cairo_region_destroy (dst_priv->old_clip_region);
if (src_priv->old_clip_region)
dst_priv->old_clip_region = cairo_region_copy (src_priv->old_clip_region);
else
dst_priv->old_clip_region = NULL;
if (src_priv->clip_mask)
dst_priv->clip_mask = g_object_ref (src_priv->clip_mask);
else
dst_priv->clip_mask = NULL;
if (src_priv->old_clip_mask)
dst_priv->old_clip_mask = g_object_ref (src_priv->old_clip_mask);
else
dst_priv->old_clip_mask = NULL;
dst_priv->fill = src_priv->fill;
if (dst_priv->stipple)
g_object_unref (dst_priv->stipple);
dst_priv->stipple = src_priv->stipple;
if (dst_priv->stipple)
g_object_ref (dst_priv->stipple);
if (dst_priv->tile)
g_object_unref (dst_priv->tile);
dst_priv->tile = src_priv->tile;
if (dst_priv->tile)
g_object_ref (dst_priv->tile);
dst_priv->fg_pixel = src_priv->fg_pixel;
dst_priv->bg_pixel = src_priv->bg_pixel;
dst_priv->subwindow_mode = src_priv->subwindow_mode;
dst_priv->exposures = src_priv->exposures;
}
/**
* gdk_gc_set_colormap:
* @gc: a #GdkGC
* @colormap: a #GdkColormap
*
* Sets the colormap for the GC to the given colormap. The depth
* of the colormap's visual must match the depth of the drawable
* for which the GC was created.
**/
void
gdk_gc_set_colormap (GdkGC *gc,
GdkColormap *colormap)
{
g_return_if_fail (GDK_IS_GC (gc));
g_return_if_fail (GDK_IS_COLORMAP (colormap));
if (gc->colormap != colormap)
{
if (gc->colormap)
g_object_unref (gc->colormap);
gc->colormap = colormap;
g_object_ref (gc->colormap);
}
}
/**
* gdk_gc_get_colormap:
* @gc: a #GdkGC
*
* Retrieves the colormap for a given GC, if it exists.
* A GC will have a colormap if the drawable for which it was created
* has a colormap, or if a colormap was set explicitely with
* gdk_gc_set_colormap.
*
* Return value: the colormap of @gc, or %NULL if @gc doesn't have one.
**/
GdkColormap *
gdk_gc_get_colormap (GdkGC *gc)
{
g_return_val_if_fail (GDK_IS_GC (gc), NULL);
return gc->colormap;
}
static GdkColormap *
gdk_gc_get_colormap_warn (GdkGC *gc)
{
GdkColormap *colormap = gdk_gc_get_colormap (gc);
if (!colormap)
{
g_warning ("gdk_gc_set_rgb_fg_color() and gdk_gc_set_rgb_bg_color() can\n"
"only be used on GC's with a colormap. A GC will have a colormap\n"
"if it is created for a drawable with a colormap, or if a\n"
"colormap has been set explicitly with gdk_gc_set_colormap.\n");
return NULL;
}
return colormap;
}
/**
* gdk_gc_set_rgb_fg_color:
* @gc: a #GdkGC
* @color: an unallocated #GdkColor.
*
* Set the foreground color of a GC using an unallocated color. The
* pixel value for the color will be determined using GdkRGB. If the
* colormap for the GC has not previously been initialized for GdkRGB,
* then for pseudo-color colormaps (colormaps with a small modifiable
* number of colors), a colorcube will be allocated in the colormap.
*
* Calling this function for a GC without a colormap is an error.
**/
void
gdk_gc_set_rgb_fg_color (GdkGC *gc,
const GdkColor *color)
{
GdkColormap *cmap;
GdkColor tmp_color;
g_return_if_fail (GDK_IS_GC (gc));
g_return_if_fail (color != NULL);
cmap = gdk_gc_get_colormap_warn (gc);
if (!cmap)
return;
tmp_color = *color;
gdk_rgb_find_color (cmap, &tmp_color);
gdk_gc_set_foreground (gc, &tmp_color);
}
/**
* gdk_gc_set_rgb_bg_color:
* @gc: a #GdkGC
* @color: an unallocated #GdkColor.
*
* Set the background color of a GC using an unallocated color. The
* pixel value for the color will be determined using GdkRGB. If the
* colormap for the GC has not previously been initialized for GdkRGB,
* then for pseudo-color colormaps (colormaps with a small modifiable
* number of colors), a colorcube will be allocated in the colormap.
*
* Calling this function for a GC without a colormap is an error.
**/
void
gdk_gc_set_rgb_bg_color (GdkGC *gc,
const GdkColor *color)
{
GdkColormap *cmap;
GdkColor tmp_color;
g_return_if_fail (GDK_IS_GC (gc));
g_return_if_fail (color != NULL);
cmap = gdk_gc_get_colormap_warn (gc);
if (!cmap)
return;
tmp_color = *color;
gdk_rgb_find_color (cmap, &tmp_color);
gdk_gc_set_background (gc, &tmp_color);
}
static cairo_surface_t *
make_stipple_tile_surface (cairo_t *cr,
GdkBitmap *stipple,
GdkColor *foreground,
GdkColor *background)
{
cairo_t *tmp_cr;
cairo_surface_t *surface;
cairo_surface_t *alpha_surface;
gint width, height;
gdk_drawable_get_size (stipple,
&width, &height);
alpha_surface = _gdk_drawable_ref_cairo_surface (stipple);
surface = cairo_surface_create_similar (cairo_get_target (cr),
CAIRO_CONTENT_COLOR_ALPHA,
width, height);
tmp_cr = cairo_create (surface);
cairo_set_operator (tmp_cr, CAIRO_OPERATOR_SOURCE);
if (background)
gdk_cairo_set_source_color (tmp_cr, background);
else
cairo_set_source_rgba (tmp_cr, 0, 0, 0 ,0);
cairo_paint (tmp_cr);
cairo_set_operator (tmp_cr, CAIRO_OPERATOR_OVER);
gdk_cairo_set_source_color (tmp_cr, foreground);
cairo_mask_surface (tmp_cr, alpha_surface, 0, 0);
cairo_destroy (tmp_cr);
cairo_surface_destroy (alpha_surface);
return surface;
}
static void
gc_get_foreground (GdkGC *gc,
GdkColor *color)
{
GdkGCPrivate *priv = GDK_GC_GET_PRIVATE (gc);
color->pixel = priv->bg_pixel;
if (gc->colormap)
gdk_colormap_query_color (gc->colormap, priv->fg_pixel, color);
else
g_warning ("No colormap in gc_get_foreground");
}
static void
gc_get_background (GdkGC *gc,
GdkColor *color)
{
GdkGCPrivate *priv = GDK_GC_GET_PRIVATE (gc);
color->pixel = priv->bg_pixel;
if (gc->colormap)
gdk_colormap_query_color (gc->colormap, priv->bg_pixel, color);
else
g_warning ("No colormap in gc_get_background");
}
/**
* _gdk_gc_update_context:
* @gc: a #GdkGC
* @cr: a #cairo_t
* @override_foreground: a foreground color to use to override the
* foreground color of the GC
* @override_stipple: a stipple pattern to use to override the
* stipple from the GC. If this is present and the fill mode
* of the GC isn't %GDK_STIPPLED or %GDK_OPAQUE_STIPPLED
* the fill mode will be forced to %GDK_STIPPLED
* @gc_changed: pass %FALSE if the @gc has not changed since the
* last call to this function
* @target_drawable: The drawable you're drawing in. If passed in
* this is used for client side window clip emulation.
*
* Set the attributes of a cairo context to match those of a #GdkGC
* as far as possible. Some aspects of a #GdkGC, such as clip masks
* and functions other than %GDK_COPY are not currently handled.
**/
void
_gdk_gc_update_context (GdkGC *gc,
cairo_t *cr,
const GdkColor *override_foreground,
GdkBitmap *override_stipple,
gboolean gc_changed,
GdkDrawable *target_drawable)
{
GdkGCPrivate *priv;
GdkFill fill;
GdkColor foreground;
GdkColor background;
cairo_surface_t *tile_surface = NULL;
GdkBitmap *stipple = NULL;
g_return_if_fail (GDK_IS_GC (gc));
g_return_if_fail (cr != NULL);
g_return_if_fail (override_stipple == NULL || GDK_IS_PIXMAP (override_stipple));
priv = GDK_GC_GET_PRIVATE (gc);
_gdk_gc_remove_drawable_clip (gc);
fill = priv->fill;
if (override_stipple && fill != GDK_OPAQUE_STIPPLED)
fill = GDK_STIPPLED;
if (fill != GDK_TILED)
{
if (override_foreground)
foreground = *override_foreground;
else
gc_get_foreground (gc, &foreground);
}
if (fill == GDK_OPAQUE_STIPPLED)
gc_get_background (gc, &background);
switch (fill)
{
case GDK_SOLID:
break;
case GDK_TILED:
if (!priv->tile)
fill = GDK_SOLID;
break;
case GDK_STIPPLED:
case GDK_OPAQUE_STIPPLED:
if (override_stipple)
stipple = override_stipple;
else
stipple = priv->stipple;
if (!stipple)
fill = GDK_SOLID;
break;
}
switch (fill)
{
case GDK_SOLID:
gdk_cairo_set_source_color (cr, &foreground);
break;
case GDK_TILED:
tile_surface = _gdk_drawable_ref_cairo_surface (priv->tile);
break;
case GDK_STIPPLED:
tile_surface = make_stipple_tile_surface (cr, stipple, &foreground, NULL);
break;
case GDK_OPAQUE_STIPPLED:
tile_surface = make_stipple_tile_surface (cr, stipple, &foreground, &background);
break;
}
/* Tiles, stipples, and clip regions are all specified in device space,
* not user space. For the clip region, we can simply change the matrix,
* clip, then clip back, but for the source pattern, we need to
* compute the right matrix.
*
* What we want is:
*
* CTM_inverse * Pattern_matrix = Translate(- ts_x, - ts_y)
*
* (So that ts_x, ts_y in device space is taken to 0,0 in pattern
* space). So, pattern_matrix = CTM * Translate(- ts_x, - tx_y);
*/
if (tile_surface)
{
cairo_pattern_t *pattern = cairo_pattern_create_for_surface (tile_surface);
cairo_matrix_t user_to_device;
cairo_matrix_t user_to_pattern;
cairo_matrix_t device_to_pattern;
cairo_get_matrix (cr, &user_to_device);
cairo_matrix_init_translate (&device_to_pattern,
- gc->ts_x_origin, - gc->ts_y_origin);
cairo_matrix_multiply (&user_to_pattern,
&user_to_device, &device_to_pattern);
cairo_pattern_set_matrix (pattern, &user_to_pattern);
cairo_pattern_set_extend (pattern, CAIRO_EXTEND_REPEAT);
cairo_set_source (cr, pattern);
cairo_surface_destroy (tile_surface);
cairo_pattern_destroy (pattern);
}
if (!gc_changed)
return;
cairo_reset_clip (cr);
/* The reset above resets the window clip rect, so we want to re-set that */
if (target_drawable && GDK_DRAWABLE_GET_CLASS (target_drawable)->set_cairo_clip)
GDK_DRAWABLE_GET_CLASS (target_drawable)->set_cairo_clip (target_drawable, cr);
if (priv->clip_region)
{
cairo_save (cr);
cairo_identity_matrix (cr);
cairo_translate (cr, gc->clip_x_origin, gc->clip_y_origin);
cairo_new_path (cr);
gdk_cairo_region (cr, priv->clip_region);
cairo_restore (cr);
cairo_clip (cr);
}
}
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