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b990b30723
1999-11-22 Federico Mena Quintero <federico@redhat.com> * src/gnome-canvas-pixbuf.c (gnome_canvas_pixbuf_draw): Create the temporary buffer to the size of the interesction of the bounding box and the expose area, not the whole expose area. This speeds up things a lot. * src/gdk-pixbuf-render.c (gdk_pixbuf_render_threshold_alpha): Do not paint black on the mask, since we already cleared it in a single gdk_draw_rectangle() operation.
875 lines
21 KiB
C
875 lines
21 KiB
C
/* GNOME libraries - GdkPixbuf item for the GNOME canvas
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*
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* Copyright (C) 1999 The Free Software Foundation
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*
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* Author: Federico Mena-Quintero <federico@gimp.org>
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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 Library 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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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library 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 <config.h>
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#include <math.h>
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#include <libgnomeui/gnome-canvas.h>
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#include <libgnomeui/gnome-canvas-util.h>
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#include "gdk-pixbuf/gdk-pixbuf.h"
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#include "gdk-pixbuf/gnome-canvas-pixbuf.h"
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#include "libart_lgpl/art_rgb_pixbuf_affine.h"
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/* Private part of the GnomeCanvasPixbuf structure */
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typedef struct {
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/* Our gdk-pixbuf */
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GdkPixbuf *pixbuf;
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/* Width value */
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double width;
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/* Height value */
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double height;
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/* X translation */
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double x;
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/* Y translation */
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double y;
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/* Whether dimensions are set and whether they are in pixels or units */
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guint width_set : 1;
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guint width_pixels : 1;
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guint height_set : 1;
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guint height_pixels : 1;
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guint x_set : 1;
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guint x_pixels : 1;
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guint y_set : 1;
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guint y_pixels : 1;
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/* Whether the pixbuf has changed */
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guint need_pixbuf_update : 1;
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/* Whether the transformation or size have changed */
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guint need_xform_update : 1;
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} PixbufPrivate;
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/* Object argument IDs */
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enum {
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ARG_0,
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ARG_PIXBUF,
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ARG_WIDTH,
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ARG_WIDTH_SET,
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ARG_WIDTH_PIXELS,
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ARG_HEIGHT,
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ARG_HEIGHT_SET,
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ARG_HEIGHT_PIXELS,
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ARG_X,
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ARG_X_SET,
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ARG_X_PIXELS,
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ARG_Y,
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ARG_Y_SET,
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ARG_Y_PIXELS
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};
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static void gnome_canvas_pixbuf_class_init (GnomeCanvasPixbufClass *class);
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static void gnome_canvas_pixbuf_init (GnomeCanvasPixbuf *cpb);
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static void gnome_canvas_pixbuf_destroy (GtkObject *object);
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static void gnome_canvas_pixbuf_set_arg (GtkObject *object, GtkArg *arg, guint arg_id);
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static void gnome_canvas_pixbuf_get_arg (GtkObject *object, GtkArg *arg, guint arg_id);
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static void gnome_canvas_pixbuf_update (GnomeCanvasItem *item, double *affine,
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ArtSVP *clip_path, int flags);
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static void gnome_canvas_pixbuf_draw (GnomeCanvasItem *item, GdkDrawable *drawable,
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int x, int y, int width, int height);
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static void gnome_canvas_pixbuf_render (GnomeCanvasItem *item, GnomeCanvasBuf *buf);
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static double gnome_canvas_pixbuf_point (GnomeCanvasItem *item, double x, double y, int cx, int cy,
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GnomeCanvasItem **actual_item);
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static void gnome_canvas_pixbuf_bounds (GnomeCanvasItem *item,
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double *x1, double *y1, double *x2, double *y2);
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static GnomeCanvasItemClass *parent_class;
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/**
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* gnome_canvas_pixbuf_get_type:
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* @void:
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*
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* Registers the #GnomeCanvasPixbuf class if necessary, and returns the type ID
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* associated to it.
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*
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* Return value: The type ID of the #GnomeCanvasPixbuf class.
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**/
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GtkType
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gnome_canvas_pixbuf_get_type (void)
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{
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static GtkType canvas_pixbuf_type = 0;
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if (!canvas_pixbuf_type) {
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static const GtkTypeInfo canvas_pixbuf_info = {
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"GnomeCanvasPixbuf",
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sizeof (GnomeCanvasPixbuf),
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sizeof (GnomeCanvasPixbufClass),
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(GtkClassInitFunc) gnome_canvas_pixbuf_class_init,
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(GtkObjectInitFunc) gnome_canvas_pixbuf_init,
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NULL, /* reserved_1 */
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NULL, /* reserved_2 */
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(GtkClassInitFunc) NULL
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};
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canvas_pixbuf_type = gtk_type_unique (gnome_canvas_item_get_type (),
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&canvas_pixbuf_info);
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}
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return canvas_pixbuf_type;
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}
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/* Class initialization function for the pixbuf canvas item */
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static void
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gnome_canvas_pixbuf_class_init (GnomeCanvasPixbufClass *class)
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{
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GtkObjectClass *object_class;
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GnomeCanvasItemClass *item_class;
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object_class = (GtkObjectClass *) class;
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item_class = (GnomeCanvasItemClass *) class;
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parent_class = gtk_type_class (gnome_canvas_item_get_type ());
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gtk_object_add_arg_type ("GnomeCanvasPixbuf::pixbuf",
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GTK_TYPE_POINTER, GTK_ARG_READWRITE, ARG_PIXBUF);
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gtk_object_add_arg_type ("GnomeCanvasPixbuf::width",
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GTK_TYPE_DOUBLE, GTK_ARG_READWRITE, ARG_WIDTH);
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gtk_object_add_arg_type ("GnomeCanvasPixbuf::width_set",
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GTK_TYPE_BOOL, GTK_ARG_READWRITE, ARG_WIDTH_SET);
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gtk_object_add_arg_type ("GnomeCanvasPixbuf::width_pixels",
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GTK_TYPE_BOOL, GTK_ARG_READWRITE, ARG_WIDTH_PIXELS);
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gtk_object_add_arg_type ("GnomeCanvasPixbuf::height",
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GTK_TYPE_DOUBLE, GTK_ARG_READWRITE, ARG_HEIGHT);
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gtk_object_add_arg_type ("GnomeCanvasPixbuf::height_set",
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GTK_TYPE_BOOL, GTK_ARG_READWRITE, ARG_HEIGHT_SET);
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gtk_object_add_arg_type ("GnomeCanvasPixbuf::height_pixels",
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GTK_TYPE_BOOL, GTK_ARG_READWRITE, ARG_HEIGHT_PIXELS);
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gtk_object_add_arg_type ("GnomeCanvasPixbuf::x",
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GTK_TYPE_DOUBLE, GTK_ARG_READWRITE, ARG_X);
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gtk_object_add_arg_type ("GnomeCanvasPixbuf::x_set",
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GTK_TYPE_BOOL, GTK_ARG_READWRITE, ARG_X_SET);
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gtk_object_add_arg_type ("GnomeCanvasPixbuf::x_pixels",
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GTK_TYPE_BOOL, GTK_ARG_READWRITE, ARG_X_PIXELS);
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gtk_object_add_arg_type ("GnomeCanvasPixbuf::y",
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GTK_TYPE_DOUBLE, GTK_ARG_READWRITE, ARG_Y);
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gtk_object_add_arg_type ("GnomeCanvasPixbuf::y_set",
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GTK_TYPE_BOOL, GTK_ARG_READWRITE, ARG_Y_SET);
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gtk_object_add_arg_type ("GnomeCanvasPixbuf::y_pixels",
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GTK_TYPE_BOOL, GTK_ARG_READWRITE, ARG_Y_PIXELS);
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object_class->destroy = gnome_canvas_pixbuf_destroy;
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object_class->set_arg = gnome_canvas_pixbuf_set_arg;
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object_class->get_arg = gnome_canvas_pixbuf_get_arg;
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item_class->update = gnome_canvas_pixbuf_update;
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item_class->draw = gnome_canvas_pixbuf_draw;
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item_class->render = gnome_canvas_pixbuf_render;
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item_class->point = gnome_canvas_pixbuf_point;
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item_class->bounds = gnome_canvas_pixbuf_bounds;
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}
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/* Object initialization function for the pixbuf canvas item */
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static void
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gnome_canvas_pixbuf_init (GnomeCanvasPixbuf *gcp)
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{
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PixbufPrivate *priv;
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priv = g_new0 (PixbufPrivate, 1);
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gcp->priv = priv;
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priv->width = 0.0;
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priv->height = 0.0;
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priv->x = 0.0;
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priv->y = 0.0;
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}
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/* Destroy handler for the pixbuf canvas item */
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static void
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gnome_canvas_pixbuf_destroy (GtkObject *object)
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{
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GnomeCanvasItem *item;
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GnomeCanvasPixbuf *gcp;
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PixbufPrivate *priv;
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g_return_if_fail (object != NULL);
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g_return_if_fail (GNOME_IS_CANVAS_PIXBUF (object));
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item = GNOME_CANVAS_ITEM (object);
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gcp = (GNOME_CANVAS_PIXBUF (object));
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priv = gcp->priv;
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gnome_canvas_request_redraw (item->canvas, item->x1, item->y1, item->x2, item->y2);
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if (priv->pixbuf)
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gdk_pixbuf_unref (priv->pixbuf);
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g_free (priv);
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if (GTK_OBJECT_CLASS (parent_class)->destroy)
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(* GTK_OBJECT_CLASS (parent_class)->destroy) (object);
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}
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/* Set_arg handler for the pixbuf canvas item */
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static void
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gnome_canvas_pixbuf_set_arg (GtkObject *object, GtkArg *arg, guint arg_id)
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{
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GnomeCanvasItem *item;
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GnomeCanvasPixbuf *gcp;
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PixbufPrivate *priv;
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GdkPixbuf *pixbuf;
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double val;
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item = GNOME_CANVAS_ITEM (object);
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gcp = GNOME_CANVAS_PIXBUF (object);
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priv = gcp->priv;
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switch (arg_id) {
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case ARG_PIXBUF:
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pixbuf = GTK_VALUE_POINTER (*arg);
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if (pixbuf != priv->pixbuf) {
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if (pixbuf) {
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g_return_if_fail (pixbuf->art_pixbuf->format == ART_PIX_RGB);
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g_return_if_fail (pixbuf->art_pixbuf->n_channels == 3
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|| pixbuf->art_pixbuf->n_channels == 4);
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g_return_if_fail (pixbuf->art_pixbuf->bits_per_sample == 8);
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gdk_pixbuf_ref (pixbuf);
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}
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if (priv->pixbuf)
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gdk_pixbuf_unref (priv->pixbuf);
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priv->pixbuf = pixbuf;
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}
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priv->need_pixbuf_update = TRUE;
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gnome_canvas_item_request_update (item);
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break;
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case ARG_WIDTH:
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val = GTK_VALUE_DOUBLE (*arg);
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g_return_if_fail (val >= 0.0);
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priv->width = val;
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priv->need_xform_update = TRUE;
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gnome_canvas_item_request_update (item);
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break;
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case ARG_WIDTH_SET:
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priv->width_set = GTK_VALUE_BOOL (*arg) ? TRUE : FALSE;
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priv->need_xform_update = TRUE;
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gnome_canvas_item_request_update (item);
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break;
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case ARG_WIDTH_PIXELS:
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priv->width_pixels = GTK_VALUE_BOOL (*arg) ? TRUE : FALSE;
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priv->need_xform_update = TRUE;
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gnome_canvas_item_request_update (item);
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break;
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case ARG_HEIGHT:
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val = GTK_VALUE_DOUBLE (*arg);
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g_return_if_fail (val >= 0.0);
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priv->height = val;
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priv->need_xform_update = TRUE;
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gnome_canvas_item_request_update (item);
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break;
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case ARG_HEIGHT_SET:
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priv->height_set = GTK_VALUE_BOOL (*arg) ? TRUE : FALSE;
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priv->need_xform_update = TRUE;
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gnome_canvas_item_request_update (item);
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break;
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case ARG_HEIGHT_PIXELS:
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priv->height_pixels = GTK_VALUE_BOOL (*arg) ? TRUE : FALSE;
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priv->need_xform_update = TRUE;
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gnome_canvas_item_request_update (item);
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break;
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case ARG_X:
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priv->x = GTK_VALUE_DOUBLE (*arg);
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priv->need_xform_update = TRUE;
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gnome_canvas_item_request_update (item);
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break;
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case ARG_X_SET:
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priv->x_set = GTK_VALUE_BOOL (*arg) ? TRUE : FALSE;
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priv->need_xform_update = TRUE;
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gnome_canvas_item_request_update (item);
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break;
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case ARG_X_PIXELS:
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priv->x_pixels = GTK_VALUE_BOOL (*arg) ? TRUE : FALSE;
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priv->need_xform_update = TRUE;
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gnome_canvas_item_request_update (item);
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break;
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case ARG_Y:
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priv->y = GTK_VALUE_DOUBLE (*arg);
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priv->need_xform_update = TRUE;
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gnome_canvas_item_request_update (item);
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break;
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case ARG_Y_SET:
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priv->y_set = GTK_VALUE_BOOL (*arg) ? TRUE : FALSE;
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priv->need_xform_update = TRUE;
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gnome_canvas_item_request_update (item);
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break;
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case ARG_Y_PIXELS:
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priv->y_pixels = GTK_VALUE_BOOL (*arg) ? TRUE : FALSE;
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priv->need_xform_update = TRUE;
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gnome_canvas_item_request_update (item);
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break;
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default:
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break;
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}
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}
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/* Get_arg handler for the pixbuf canvasi item */
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static void
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gnome_canvas_pixbuf_get_arg (GtkObject *object, GtkArg *arg, guint arg_id)
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{
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GnomeCanvasItem *item;
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GnomeCanvasPixbuf *gcp;
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PixbufPrivate *priv;
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item = GNOME_CANVAS_ITEM (object);
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gcp = GNOME_CANVAS_PIXBUF (object);
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priv = gcp->priv;
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switch (arg_id) {
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case ARG_PIXBUF:
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GTK_VALUE_POINTER (*arg) = priv->pixbuf;
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break;
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case ARG_WIDTH:
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GTK_VALUE_DOUBLE (*arg) = priv->width;
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break;
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case ARG_WIDTH_SET:
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GTK_VALUE_BOOL (*arg) = priv->width_set;
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break;
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case ARG_WIDTH_PIXELS:
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GTK_VALUE_BOOL (*arg) = priv->width_pixels;
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break;
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case ARG_HEIGHT:
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GTK_VALUE_DOUBLE (*arg) = priv->height;
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break;
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case ARG_HEIGHT_SET:
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GTK_VALUE_BOOL (*arg) = priv->height_set;
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break;
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case ARG_HEIGHT_PIXELS:
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GTK_VALUE_BOOL (*arg) = priv->height_pixels;
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break;
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case ARG_X:
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GTK_VALUE_DOUBLE (*arg) = priv->x;
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break;
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case ARG_X_SET:
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GTK_VALUE_BOOL (*arg) = priv->x_set;
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break;
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case ARG_X_PIXELS:
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GTK_VALUE_BOOL (*arg) = priv->x_pixels;
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break;
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case ARG_Y:
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GTK_VALUE_DOUBLE (*arg) = priv->y;
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break;
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case ARG_Y_SET:
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GTK_VALUE_BOOL (*arg) = priv->y_set;
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break;
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case ARG_Y_PIXELS:
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GTK_VALUE_BOOL (*arg) = priv->y_pixels;
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break;
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default:
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arg->type = GTK_TYPE_INVALID;
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break;
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}
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}
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/* Bounds and utilities */
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/* Computes the amount by which the unit horizontal and vertical vectors will be
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* scaled by an affine transformation.
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*/
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static void
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compute_xform_scaling (double *affine, ArtPoint *i_c, ArtPoint *j_c)
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{
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ArtPoint orig, orig_c;
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ArtPoint i, j;
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/* Origin */
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orig.x = 0.0;
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orig.y = 0.0;
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art_affine_point (&orig_c, &orig, affine);
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/* Horizontal and vertical vectors */
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i.x = 1.0;
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i.y = 0.0;
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art_affine_point (i_c, &i, affine);
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i_c->x -= orig_c.x;
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i_c->y -= orig_c.y;
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j.x = 0.0;
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j.y = 1.0;
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art_affine_point (j_c, &j, affine);
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j_c->x -= orig_c.x;
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j_c->y -= orig_c.y;
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}
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/* computes the addtional resolution dependent affine needed to
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* fit the image within its viewport defined by x,y,width and height
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* args
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*/
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static void
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compute_viewport_affine (GnomeCanvasPixbuf *gcp, double *viewport_affine, double *i2c)
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{
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PixbufPrivate *priv;
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ArtPoint i_c, j_c;
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double i_len, j_len;
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double si_len, sj_len;
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double ti_len, tj_len;
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double scale[6], translate[6];
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double w, h;
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double x, y;
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priv = gcp->priv;
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/* Compute scaling vectors and required width/height */
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compute_xform_scaling (i2c, &i_c, &j_c);
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i_len = sqrt (i_c.x * i_c.x + i_c.y * i_c.y);
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j_len = sqrt (j_c.x * j_c.x + j_c.y * j_c.y);
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if (priv->width_set)
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w = priv->width;
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else
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w = priv->pixbuf->art_pixbuf->width;
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if (priv->height_set)
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h = priv->height;
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else
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h = priv->pixbuf->art_pixbuf->height;
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if (priv->x_set)
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x = priv->x;
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else
|
||
x = 0.0;
|
||
|
||
if (priv->y_set)
|
||
y = priv->y;
|
||
else
|
||
y = 0.0;
|
||
|
||
/* Convert i_len and j_len into scaling factors */
|
||
|
||
if (priv->width_pixels) {
|
||
if (i_len > GNOME_CANVAS_EPSILON)
|
||
si_len = 1.0 / i_len;
|
||
else
|
||
si_len = 0.0;
|
||
} else
|
||
si_len = 1.0;
|
||
|
||
si_len *= w / priv->pixbuf->art_pixbuf->width;
|
||
|
||
if (priv->height_pixels) {
|
||
if (j_len > GNOME_CANVAS_EPSILON)
|
||
sj_len = 1.0 / j_len;
|
||
else
|
||
sj_len = 0.0;
|
||
} else
|
||
sj_len = 1.0;
|
||
|
||
sj_len *= h / priv->pixbuf->art_pixbuf->height;
|
||
|
||
/* Calculate translation offsets */
|
||
|
||
if (priv->x_pixels) {
|
||
if (i_len > GNOME_CANVAS_EPSILON)
|
||
ti_len = 1.0 / i_len;
|
||
else
|
||
ti_len = 0.0;
|
||
} else
|
||
ti_len = 1.0;
|
||
|
||
ti_len *= x;
|
||
|
||
if (priv->y_pixels) {
|
||
if (j_len > GNOME_CANVAS_EPSILON)
|
||
tj_len = 1.0 / j_len;
|
||
else
|
||
tj_len = 0.0;
|
||
} else
|
||
tj_len = 1.0;
|
||
|
||
tj_len *= y;
|
||
|
||
/* Compute the final affine */
|
||
|
||
art_affine_scale (scale, si_len, sj_len);
|
||
art_affine_translate (translate, ti_len, tj_len);
|
||
art_affine_multiply (viewport_affine, scale, translate);
|
||
}
|
||
|
||
/* Computes the affine transformation with which the pixbuf needs to be
|
||
* transformed to render it on the canvas. This is not the same as the
|
||
* item_to_canvas transformation because we may need to scale the pixbuf
|
||
* by some other amount.
|
||
*/
|
||
static void
|
||
compute_render_affine (GnomeCanvasPixbuf *gcp, double *render_affine, double *i2c)
|
||
{
|
||
double viewport_affine[6];
|
||
|
||
compute_viewport_affine (gcp, viewport_affine, i2c);
|
||
art_affine_multiply (render_affine, viewport_affine, i2c);
|
||
}
|
||
|
||
/* Recomputes the bounding box of a pixbuf canvas item. The horizontal and
|
||
* vertical dimensions may be specified in units or pixels, separately, so we
|
||
* have to compute the components individually for each dimension.
|
||
*/
|
||
static void
|
||
recompute_bounding_box (GnomeCanvasPixbuf *gcp)
|
||
{
|
||
GnomeCanvasItem *item;
|
||
PixbufPrivate *priv;
|
||
double i2c[6], render_affine[6];
|
||
ArtDRect rect;
|
||
|
||
item = GNOME_CANVAS_ITEM (gcp);
|
||
priv = gcp->priv;
|
||
|
||
if (!priv->pixbuf) {
|
||
item->x1 = item->y1 = item->x2 = item->y2 = 0.0;
|
||
return;
|
||
}
|
||
|
||
rect.x0 = 0.0;
|
||
rect.x1 = priv->pixbuf->art_pixbuf->width;
|
||
|
||
rect.y0 = 0.0;
|
||
rect.y1 = priv->pixbuf->art_pixbuf->height;
|
||
|
||
gnome_canvas_item_i2c_affine (item, i2c);
|
||
compute_render_affine (gcp, render_affine, i2c);
|
||
art_drect_affine_transform (&rect, &rect, render_affine);
|
||
|
||
item->x1 = floor (rect.x0);
|
||
item->y1 = floor (rect.y0);
|
||
item->x2 = ceil (rect.x1);
|
||
item->y2 = ceil (rect.y1);
|
||
}
|
||
|
||
|
||
|
||
/* Update sequence */
|
||
|
||
/* Update handler for the pixbuf canvas item */
|
||
static void
|
||
gnome_canvas_pixbuf_update (GnomeCanvasItem *item, double *affine, ArtSVP *clip_path, int flags)
|
||
{
|
||
GnomeCanvasPixbuf *gcp;
|
||
PixbufPrivate *priv;
|
||
|
||
gcp = GNOME_CANVAS_PIXBUF (item);
|
||
priv = gcp->priv;
|
||
|
||
if (parent_class->update)
|
||
(* parent_class->update) (item, affine, clip_path, flags);
|
||
|
||
if (((flags & GNOME_CANVAS_UPDATE_VISIBILITY)
|
||
&& !(GTK_OBJECT_FLAGS (item) & GNOME_CANVAS_ITEM_VISIBLE))
|
||
|| (flags & GNOME_CANVAS_UPDATE_AFFINE)
|
||
|| priv->need_pixbuf_update
|
||
|| priv->need_xform_update)
|
||
gnome_canvas_request_redraw (item->canvas, item->x1, item->y1, item->x2, item->y2);
|
||
|
||
/* If we need a pixbuf update, or if the item changed visibility to
|
||
* shown, recompute the bounding box.
|
||
*/
|
||
if (priv->need_pixbuf_update
|
||
|| priv->need_xform_update
|
||
|| ((flags & GNOME_CANVAS_UPDATE_VISIBILITY)
|
||
&& (GTK_OBJECT_FLAGS (gcp) & GNOME_CANVAS_ITEM_VISIBLE))
|
||
|| (flags & GNOME_CANVAS_UPDATE_AFFINE)) {
|
||
recompute_bounding_box (gcp);
|
||
gnome_canvas_request_redraw (item->canvas, item->x1, item->y1, item->x2, item->y2);
|
||
priv->need_pixbuf_update = FALSE;
|
||
priv->need_xform_update = FALSE;
|
||
}
|
||
}
|
||
|
||
|
||
|
||
/* Rendering */
|
||
|
||
/* This is private to libart, but we need it. Sigh. */
|
||
extern void art_rgb_affine_run (int *p_x0, int *p_x1, int y, int src_width, int src_height,
|
||
const double affine[6]);
|
||
|
||
/* Fills the specified buffer with the transformed version of a pixbuf */
|
||
static void
|
||
transform_pixbuf (guchar *dest, int x, int y, int width, int height, int rowstride,
|
||
GdkPixbuf *pixbuf, double *affine)
|
||
{
|
||
ArtPixBuf *apb;
|
||
int xx, yy;
|
||
double inv[6];
|
||
guchar *src, *d;
|
||
ArtPoint src_p, dest_p;
|
||
int run_x1, run_x2;
|
||
int src_x, src_y;
|
||
int i;
|
||
|
||
apb = pixbuf->art_pixbuf;
|
||
|
||
art_affine_invert (inv, affine);
|
||
|
||
for (yy = 0; yy < height; yy++) {
|
||
dest_p.y = y + yy + 0.5;
|
||
|
||
run_x1 = x;
|
||
run_x2 = x + width;
|
||
art_rgb_affine_run (&run_x1, &run_x2, yy + y,
|
||
apb->width, apb->height,
|
||
inv);
|
||
|
||
d = dest + yy * rowstride + (run_x1 - x) * 4;
|
||
|
||
for (xx = run_x1; xx < run_x2; xx++) {
|
||
dest_p.x = xx + 0.5;
|
||
art_affine_point (&src_p, &dest_p, inv);
|
||
src_x = floor (src_p.x);
|
||
src_y = floor (src_p.y);
|
||
|
||
src = apb->pixels + src_y * apb->rowstride + src_x * apb->n_channels;
|
||
|
||
for (i = 0; i < apb->n_channels; i++)
|
||
*d++ = *src++;
|
||
|
||
if (!apb->has_alpha)
|
||
*d++ = 255; /* opaque */
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Draw handler for the pixbuf canvas item */
|
||
static void
|
||
gnome_canvas_pixbuf_draw (GnomeCanvasItem *item, GdkDrawable *drawable,
|
||
int x, int y, int width, int height)
|
||
{
|
||
GnomeCanvasPixbuf *gcp;
|
||
PixbufPrivate *priv;
|
||
double i2c[6], render_affine[6];
|
||
guchar *buf;
|
||
GdkPixbuf *pixbuf;
|
||
ArtIRect p_rect, a_rect, d_rect;
|
||
int w, h;
|
||
|
||
gcp = GNOME_CANVAS_PIXBUF (item);
|
||
priv = gcp->priv;
|
||
|
||
if (!priv->pixbuf)
|
||
return;
|
||
|
||
gnome_canvas_item_i2c_affine (item, i2c);
|
||
compute_render_affine (gcp, render_affine, i2c);
|
||
|
||
/* Compute the area we need to repaint */
|
||
|
||
p_rect.x0 = item->x1;
|
||
p_rect.y0 = item->y1;
|
||
p_rect.x1 = item->x2;
|
||
p_rect.y1 = item->y2;
|
||
|
||
a_rect.x0 = x;
|
||
a_rect.y0 = y;
|
||
a_rect.x1 = x + width;
|
||
a_rect.y1 = y + height;
|
||
|
||
art_irect_intersect (&d_rect, &p_rect, &a_rect);
|
||
if (art_irect_empty (&d_rect))
|
||
return;
|
||
|
||
/* Create a temporary buffer and transform the pixbuf there */
|
||
|
||
w = d_rect.x1 - d_rect.x0;
|
||
h = d_rect.y1 - d_rect.y0;
|
||
|
||
buf = g_new0 (guchar, w * h * 4);
|
||
transform_pixbuf (buf,
|
||
d_rect.x0, d_rect.y0,
|
||
w, h,
|
||
w * 4,
|
||
priv->pixbuf, render_affine);
|
||
|
||
pixbuf = gdk_pixbuf_new_from_data (buf, ART_PIX_RGB, TRUE, w, h, w * 4, NULL, NULL);
|
||
|
||
gdk_pixbuf_render_to_drawable_alpha (pixbuf, drawable,
|
||
0, 0,
|
||
d_rect.x0 - x, d_rect.y0 - y,
|
||
w, h,
|
||
GDK_PIXBUF_ALPHA_BILEVEL,
|
||
128,
|
||
GDK_RGB_DITHER_MAX,
|
||
d_rect.x0, d_rect.y0);
|
||
|
||
gdk_pixbuf_unref (pixbuf);
|
||
g_free (buf);
|
||
}
|
||
|
||
/* Render handler for the pixbuf canvas item */
|
||
static void
|
||
gnome_canvas_pixbuf_render (GnomeCanvasItem *item, GnomeCanvasBuf *buf)
|
||
{
|
||
GnomeCanvasPixbuf *gcp;
|
||
PixbufPrivate *priv;
|
||
double i2c[6], render_affine[6];
|
||
|
||
gcp = GNOME_CANVAS_PIXBUF (item);
|
||
priv = gcp->priv;
|
||
|
||
if (!priv->pixbuf)
|
||
return;
|
||
|
||
gnome_canvas_item_i2c_affine (item, i2c);
|
||
compute_render_affine (gcp, render_affine, i2c);
|
||
gnome_canvas_buf_ensure_buf (buf);
|
||
|
||
art_rgb_pixbuf_affine (buf->buf,
|
||
buf->rect.x0, buf->rect.y0, buf->rect.x1, buf->rect.y1,
|
||
buf->buf_rowstride,
|
||
priv->pixbuf->art_pixbuf,
|
||
render_affine,
|
||
ART_FILTER_NEAREST, NULL);
|
||
|
||
buf->is_bg = 0;
|
||
}
|
||
|
||
|
||
|
||
/* Point handler for the pixbuf canvas item */
|
||
static double
|
||
gnome_canvas_pixbuf_point (GnomeCanvasItem *item, double x, double y, int cx, int cy,
|
||
GnomeCanvasItem **actual_item)
|
||
{
|
||
GnomeCanvasPixbuf *gcp;
|
||
PixbufPrivate *priv;
|
||
double i2c[6], render_affine[6], inv[6];
|
||
ArtPoint c, p;
|
||
int px, py;
|
||
double no_hit;
|
||
ArtPixBuf *apb;
|
||
guchar *src;
|
||
|
||
gcp = GNOME_CANVAS_PIXBUF (item);
|
||
priv = gcp->priv;
|
||
|
||
*actual_item = item;
|
||
|
||
no_hit = item->canvas->pixels_per_unit * 2 + 10;
|
||
|
||
if (!priv->pixbuf)
|
||
return no_hit;
|
||
|
||
apb = priv->pixbuf->art_pixbuf;
|
||
|
||
gnome_canvas_item_i2c_affine (item, i2c);
|
||
compute_render_affine (gcp, render_affine, i2c);
|
||
art_affine_invert (inv, render_affine);
|
||
|
||
c.x = cx;
|
||
c.y = cy;
|
||
art_affine_point (&p, &c, inv);
|
||
px = p.x;
|
||
py = p.y;
|
||
|
||
if (px < 0 || px >= apb->width || py < 0 || py >= apb->height)
|
||
return no_hit;
|
||
|
||
if (!apb->has_alpha)
|
||
return 0.0;
|
||
|
||
src = apb->pixels + py * apb->rowstride + px * apb->n_channels;
|
||
|
||
if (src[3] < 128)
|
||
return no_hit;
|
||
else
|
||
return 0.0;
|
||
}
|
||
|
||
|
||
|
||
/* Bounds handler for the pixbuf canvas item */
|
||
static void
|
||
gnome_canvas_pixbuf_bounds (GnomeCanvasItem *item, double *x1, double *y1, double *x2, double *y2)
|
||
{
|
||
GnomeCanvasPixbuf *gcp;
|
||
PixbufPrivate *priv;
|
||
double i2c[6], viewport_affine[6];
|
||
ArtDRect rect;
|
||
|
||
gcp = GNOME_CANVAS_PIXBUF (item);
|
||
priv = gcp->priv;
|
||
|
||
if (!priv->pixbuf) {
|
||
*x1 = *y1 = *x2 = *y2 = 0.0;
|
||
return;
|
||
}
|
||
|
||
rect.x0 = 0.0;
|
||
rect.x1 = priv->pixbuf->art_pixbuf->width;
|
||
|
||
rect.y0 = 0.0;
|
||
rect.y1 = priv->pixbuf->art_pixbuf->height;
|
||
|
||
gnome_canvas_item_i2c_affine (item, i2c);
|
||
compute_viewport_affine (gcp, viewport_affine, i2c);
|
||
art_drect_affine_transform (&rect, &rect, viewport_affine);
|
||
|
||
*x1 = rect.x0;
|
||
*y1 = rect.y0;
|
||
*x2 = rect.x1;
|
||
*y2 = rect.y1;
|
||
}
|