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347 lines
9.2 KiB
C
347 lines
9.2 KiB
C
/* GDK - The GIMP Drawing Kit
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* Copyright (C) 2005 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include "gdkcairo.h"
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#include "gdkdrawable.h"
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#include "gdkinternals.h"
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#include "gdkregion-generic.h"
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#include "gdkalias.h"
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static void
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gdk_ensure_surface_flush (gpointer surface)
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{
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cairo_surface_flush (surface);
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cairo_surface_destroy (surface);
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}
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/**
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* gdk_cairo_create:
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* @drawable: a #GdkDrawable
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*
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* Creates a Cairo context for drawing to @drawable.
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*
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* <note><para>
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* Note that due to double-buffering, Cairo contexts created
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* in a GTK+ expose event handler cannot be cached and reused
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* between different expose events.
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* </para></note>
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*
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* Return value: A newly created Cairo context. Free with
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* cairo_destroy() when you are done drawing.
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*
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* Since: 2.8
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**/
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cairo_t *
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gdk_cairo_create (GdkDrawable *drawable)
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{
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static const cairo_user_data_key_t key;
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cairo_surface_t *surface;
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cairo_t *cr;
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g_return_val_if_fail (GDK_IS_DRAWABLE (drawable), NULL);
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surface = _gdk_drawable_ref_cairo_surface (drawable);
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cr = cairo_create (surface);
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if (GDK_DRAWABLE_GET_CLASS (drawable)->set_cairo_clip)
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GDK_DRAWABLE_GET_CLASS (drawable)->set_cairo_clip (drawable, cr);
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/* Ugly workaround for GTK not ensuring to flush surfaces before
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* directly accessing the drawable backed by the surface. Not visible
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* on X11 (where flushing is a no-op). For details, see
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* https://bugzilla.gnome.org/show_bug.cgi?id=628291
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*/
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cairo_set_user_data (cr, &key, surface, gdk_ensure_surface_flush);
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return cr;
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}
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/**
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* gdk_cairo_reset_clip:
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* @cr: a #cairo_t
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* @drawable: a #GdkDrawable
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*
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* Resets the clip region for a Cairo context created by gdk_cairo_create().
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*
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* This resets the clip region to the "empty" state for the given drawable.
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* This is required for non-native windows since a direct call to
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* cairo_reset_clip() would unset the clip region inherited from the
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* drawable (i.e. the window clip region), and thus let you e.g.
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* draw outside your window.
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*
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* This is rarely needed though, since most code just create a new cairo_t
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* using gdk_cairo_create() each time they want to draw something.
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*
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* Since: 2.18
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**/
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void
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gdk_cairo_reset_clip (cairo_t *cr,
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GdkDrawable *drawable)
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{
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cairo_reset_clip (cr);
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if (GDK_DRAWABLE_GET_CLASS (drawable)->set_cairo_clip)
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GDK_DRAWABLE_GET_CLASS (drawable)->set_cairo_clip (drawable, cr);
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}
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/**
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* gdk_cairo_set_source_color:
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* @cr: a #cairo_t
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* @color: a #GdkColor
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*
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* Sets the specified #GdkColor as the source color of @cr.
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*
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* Since: 2.8
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**/
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void
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gdk_cairo_set_source_color (cairo_t *cr,
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const GdkColor *color)
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{
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g_return_if_fail (cr != NULL);
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g_return_if_fail (color != NULL);
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cairo_set_source_rgb (cr,
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color->red / 65535.,
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color->green / 65535.,
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color->blue / 65535.);
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}
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/**
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* gdk_cairo_rectangle:
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* @cr: a #cairo_t
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* @rectangle: a #GdkRectangle
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*
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* Adds the given rectangle to the current path of @cr.
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*
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* Since: 2.8
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**/
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void
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gdk_cairo_rectangle (cairo_t *cr,
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const GdkRectangle *rectangle)
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{
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g_return_if_fail (cr != NULL);
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g_return_if_fail (rectangle != NULL);
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cairo_rectangle (cr,
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rectangle->x, rectangle->y,
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rectangle->width, rectangle->height);
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}
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/**
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* gdk_cairo_region:
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* @cr: a #cairo_t
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* @region: a #GdkRegion
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*
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* Adds the given region to the current path of @cr.
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*
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* Since: 2.8
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**/
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void
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gdk_cairo_region (cairo_t *cr,
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const GdkRegion *region)
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{
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GdkRegionBox *boxes;
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gint n_boxes, i;
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g_return_if_fail (cr != NULL);
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g_return_if_fail (region != NULL);
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boxes = region->rects;
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n_boxes = region->numRects;
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for (i = 0; i < n_boxes; i++)
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cairo_rectangle (cr,
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boxes[i].x1,
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boxes[i].y1,
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boxes[i].x2 - boxes[i].x1,
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boxes[i].y2 - boxes[i].y1);
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}
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/**
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* gdk_cairo_set_source_pixbuf:
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* @cr: a #Cairo context
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* @pixbuf: a #GdkPixbuf
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* @pixbuf_x: X coordinate of location to place upper left corner of @pixbuf
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* @pixbuf_y: Y coordinate of location to place upper left corner of @pixbuf
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*
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* Sets the given pixbuf as the source pattern for the Cairo context.
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* The pattern has an extend mode of %CAIRO_EXTEND_NONE and is aligned
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* so that the origin of @pixbuf is @pixbuf_x, @pixbuf_y
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*
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* Since: 2.8
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**/
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void
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gdk_cairo_set_source_pixbuf (cairo_t *cr,
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const GdkPixbuf *pixbuf,
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double pixbuf_x,
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double pixbuf_y)
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{
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gint width = gdk_pixbuf_get_width (pixbuf);
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gint height = gdk_pixbuf_get_height (pixbuf);
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guchar *gdk_pixels = gdk_pixbuf_get_pixels (pixbuf);
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int gdk_rowstride = gdk_pixbuf_get_rowstride (pixbuf);
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int n_channels = gdk_pixbuf_get_n_channels (pixbuf);
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int cairo_stride;
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guchar *cairo_pixels;
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cairo_format_t format;
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cairo_surface_t *surface;
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static const cairo_user_data_key_t key;
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int j;
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if (n_channels == 3)
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format = CAIRO_FORMAT_RGB24;
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else
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format = CAIRO_FORMAT_ARGB32;
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cairo_stride = cairo_format_stride_for_width (format, width);
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cairo_pixels = g_malloc (height * cairo_stride);
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surface = cairo_image_surface_create_for_data ((unsigned char *)cairo_pixels,
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format,
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width, height, cairo_stride);
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cairo_surface_set_user_data (surface, &key,
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cairo_pixels, (cairo_destroy_func_t)g_free);
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for (j = height; j; j--)
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{
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guchar *p = gdk_pixels;
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guchar *q = cairo_pixels;
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if (n_channels == 3)
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{
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guchar *end = p + 3 * width;
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while (p < end)
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{
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#if G_BYTE_ORDER == G_LITTLE_ENDIAN
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q[0] = p[2];
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q[1] = p[1];
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q[2] = p[0];
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#else
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q[1] = p[0];
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q[2] = p[1];
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q[3] = p[2];
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#endif
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p += 3;
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q += 4;
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}
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}
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else
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{
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guchar *end = p + 4 * width;
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guint t1,t2,t3;
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#define MULT(d,c,a,t) G_STMT_START { t = c * a + 0x7f; d = ((t >> 8) + t) >> 8; } G_STMT_END
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while (p < end)
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{
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#if G_BYTE_ORDER == G_LITTLE_ENDIAN
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MULT(q[0], p[2], p[3], t1);
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MULT(q[1], p[1], p[3], t2);
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MULT(q[2], p[0], p[3], t3);
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q[3] = p[3];
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#else
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q[0] = p[3];
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MULT(q[1], p[0], p[3], t1);
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MULT(q[2], p[1], p[3], t2);
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MULT(q[3], p[2], p[3], t3);
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#endif
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p += 4;
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q += 4;
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}
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#undef MULT
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}
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gdk_pixels += gdk_rowstride;
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cairo_pixels += cairo_stride;
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}
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cairo_set_source_surface (cr, surface, pixbuf_x, pixbuf_y);
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cairo_surface_destroy (surface);
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}
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/**
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* gdk_cairo_set_source_pixmap:
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* @cr: a #Cairo context
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* @pixmap: a #GdkPixmap
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* @pixmap_x: X coordinate of location to place upper left corner of @pixmap
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* @pixmap_y: Y coordinate of location to place upper left corner of @pixmap
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*
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* Sets the given pixmap as the source pattern for the Cairo context.
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* The pattern has an extend mode of %CAIRO_EXTEND_NONE and is aligned
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* so that the origin of @pixmap is @pixmap_x, @pixmap_y
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*
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* Since: 2.10
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*
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* Deprecated: 2.24: This function is being removed in GTK+ 3 (together
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* with #GdkPixmap). Instead, use gdk_cairo_set_source_window() where
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* appropriate.
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**/
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void
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gdk_cairo_set_source_pixmap (cairo_t *cr,
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GdkPixmap *pixmap,
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double pixmap_x,
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double pixmap_y)
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{
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cairo_surface_t *surface;
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surface = _gdk_drawable_ref_cairo_surface (GDK_DRAWABLE (pixmap));
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cairo_set_source_surface (cr, surface, pixmap_x, pixmap_y);
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cairo_surface_destroy (surface);
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}
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/**
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* gdk_cairo_set_source_window:
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* @cr: a #Cairo context
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* @window: a #GdkWindow
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* @x: X coordinate of location to place upper left corner of @window
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* @y: Y coordinate of location to place upper left corner of @window
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*
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* Sets the given window as the source pattern for the Cairo context.
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* The pattern has an extend mode of %CAIRO_EXTEND_NONE and is aligned
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* so that the origin of @window is @x, @y. The window contains all its
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* subwindows when rendering.
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*
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* Note that the contents of @window are undefined outside of the
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* visible part of @window, so use this function with care.
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*
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* Since: 2.24
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**/
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void
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gdk_cairo_set_source_window (cairo_t *cr,
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GdkWindow *window,
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double x,
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double y)
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{
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cairo_surface_t *surface;
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g_return_if_fail (cr != NULL);
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g_return_if_fail (GDK_IS_WINDOW (window));
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surface = _gdk_drawable_ref_cairo_surface (GDK_DRAWABLE (window));
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cairo_set_source_surface (cr, surface, x, y);
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cairo_surface_destroy (surface);
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}
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#define __GDK_CAIRO_C__
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#include "gdkaliasdef.c"
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