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gtk/gdk/gdkgc.c
Alexander Larsson c0084e2142 Fix clipping issue with clip masks 
When the clip mask is completely inside the drawable clip region we
don't change the clip at all. However, we did set region_tag_applied,
so when the drawable clip was removed we removed the original clip mask.
This is no good, so we fix that by returning early in this case.

Fixes issue reported in bug #592752.
2009-08-25 10:37:18 +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"
#include "gdkalias.h"
static void gdk_gc_finalize (GObject *object);
typedef struct _GdkGCPrivate GdkGCPrivate;
struct _GdkGCPrivate
{
GdkRegion *clip_region;
guint32 region_tag_applied;
int region_tag_offset_x;
int region_tag_offset_y;
GdkRegion *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)
gdk_region_destroy (priv->clip_region);
if (priv->old_clip_region)
gdk_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_ref:
* @gc: a #GdkGC
*
* Deprecated function; use g_object_ref() instead.
*
* Return value: the gc.
**/
GdkGC *
gdk_gc_ref (GdkGC *gc)
{
return (GdkGC *) g_object_ref (gc);
}
/**
* gdk_gc_unref:
* @gc: a #GdkGC
*
* Decrement the reference count of @gc.
*
* Deprecated: Use g_object_unref() instead.
**/
void
gdk_gc_unref (GdkGC *gc)
{
g_object_unref (gc);
}
/**
* 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)
{
gdk_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_font:
* @gc: a #GdkGC.
* @font: the new font.
*
* Sets the font for a graphics context. (Note that
* all text-drawing functions in GDK take a @font
* argument; the value set here is used when that
* argument is %NULL.)
**/
void
gdk_gc_set_font (GdkGC *gc,
GdkFont *font)
{
GdkGCValues values;
g_return_if_fail (GDK_IS_GC (gc));
g_return_if_fail (font != NULL);
values.font = font;
gdk_gc_set_values (gc, &values, GDK_GC_FONT);
}
/**
* 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,
GdkRegion *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)
gdk_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,
GdkRegion *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,
GdkRegion *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 = gdk_region_copy (region);
if (offset_x != 0 || offset_y != 0)
gdk_region_offset (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;
GdkOverlapType 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 = gdk_region_rect_in (region, &r);
if (overlap == GDK_OVERLAP_RECTANGLE_PART)
{
/* 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);
tmp_gc = _gdk_drawable_get_scratch_gc ((GdkDrawable *)new_mask, FALSE);
gdk_gc_set_foreground (tmp_gc, &black);
gdk_draw_rectangle (new_mask, tmp_gc, TRUE, 0, 0, -1, -1);
_gdk_gc_set_clip_region_internal (tmp_gc, region, TRUE); /* Takes ownership of region */
gdk_draw_drawable (new_mask,
tmp_gc,
priv->old_clip_mask,
0, 0,
0, 0,
-1, -1);
gdk_gc_set_clip_region (tmp_gc, NULL);
gdk_gc_set_clip_mask (gc, new_mask);
}
else if (overlap == GDK_OVERLAP_RECTANGLE_OUT)
{
/* No intersection, set empty clip region */
GdkRegion *empty = gdk_region_new ();
gdk_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 */
gdk_region_destroy (region);
return;
}
}
else
{
priv->old_clip_region = priv->clip_region;
priv->clip_region = region;
if (priv->old_clip_region)
gdk_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)
{
GdkRegion *region;
g_return_if_fail (GDK_IS_GC (gc));
_gdk_gc_remove_drawable_clip (gc);
if (rectangle)
region = gdk_region_rectangle (rectangle);
else
region = NULL;
_gdk_gc_set_clip_region_real (gc, region, TRUE);
}
/**
* gdk_gc_set_clip_region:
* @gc: a #GdkGC.
* @region: the #GdkRegion.
*
* 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 GdkRegion *region)
{
GdkRegion *copy;
g_return_if_fail (GDK_IS_GC (gc));
_gdk_gc_remove_drawable_clip (gc);
if (region)
copy = gdk_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.
**/
GdkRegion *
_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)
gdk_region_destroy (dst_priv->clip_region);
if (src_priv->clip_region)
dst_priv->clip_region = gdk_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)
gdk_region_destroy (dst_priv->old_clip_region);
if (src_priv->old_clip_region)
dst_priv->old_clip_region = gdk_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);
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);
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);
}
/* 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);
}
#define __GDK_GC_C__
#include "gdkaliasdef.c"
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