gtk2/gdk-pixbuf/gnome-canvas-pixbuf.c

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/* GNOME libraries - GdkPixbuf item for the GNOME canvas
*
* Copyright (C) 1999 The Free Software Foundation
*
* Author: Federico Mena-Quintero <federico@gimp.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include <config.h>
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#include <math.h>
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#include <libart_lgpl/art_rgb_affine_private.h>
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#include "gdk-pixbuf.h"
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#include "gnome-canvas-pixbuf.h"
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/* Private part of the GnomeCanvasPixbuf structure */
typedef struct {
/* Our gdk-pixbuf */
GdkPixbuf *pixbuf;
/* Width value */
double width;
/* Height value */
double height;
/* Whether dimensions are set and whether they are in pixels or units */
guint width_set : 1;
guint width_pixels : 1;
guint height_set : 1;
guint height_pixels : 1;
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/* Whether the pixbuf has changed */
guint need_pixbuf_update : 1;
/* Whether the size has changed */
guint need_size_update : 1;
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} PixbufPrivate;
/* Object argument IDs */
enum {
ARG_0,
ARG_PIXBUF,
ARG_WIDTH,
ARG_WIDTH_SET,
ARG_WIDTH_PIXELS,
ARG_HEIGHT,
ARG_HEIGHT_SET,
ARG_HEIGHT_PIXELS
};
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static void gnome_canvas_pixbuf_class_init (GnomeCanvasPixbufClass *class);
static void gnome_canvas_pixbuf_init (GnomeCanvasPixbuf *cpb);
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);
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,
ArtSVP *clip_path, int flags);
static void gnome_canvas_pixbuf_draw (GnomeCanvasItem *item, GdkDrawable *drawable,
int x, int y, int width, int height);
static double gnome_canvas_pixbuf_point (GnomeCanvasItem *item, double x, double y, int cx, int cy,
GnomeCanvasItem **actual_item);
static void gnome_canvas_pixbuf_bounds (GnomeCanvasItem *item,
double *x1, double *y1, double *x2, double *y2);
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static GnomeCanvasItemClass *parent_class;
/**
* gnome_canvas_pixbuf_get_type:
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* @void:
*
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* Registers the &GnomeCanvasPixbuf class if necessary, and returns the type ID
* associated to it.
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*
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* Return value: The type ID of the &GnomeCanvasPixbuf class.
**/
GtkType
gnome_canvas_pixbuf_get_type (void)
{
static GtkType canvas_pixbuf_type = 0;
if (!canvas_pixbuf_type) {
static const GtkTypeInfo canvas_pixbuf_info = {
"GnomeCanvasPixbuf",
sizeof (GnomeCanvasPixbuf),
sizeof (GnomeCanvasPixbufClass),
(GtkClassInitFunc) gnome_canvas_pixbuf_class_init,
(GtkObjectInitFunc) gnome_canvas_pixbuf_init,
NULL, /* reserved_1 */
NULL, /* reserved_2 */
(GtkClassInitFunc) NULL
};
canvas_pixbuf_type = gtk_type_unique (gnome_canvas_item_get_type (),
&canvas_pixbuf_info);
}
return canvas_pixbuf_type;
}
/* Class initialization function for the pixbuf canvas item */
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static void
gnome_canvas_pixbuf_class_init (GnomeCanvasPixbufClass *class)
{
GtkObjectClass *object_class;
GnomeCanvasItemClass *item_class;
object_class = (GtkObjectClass *) class;
item_class = (GnomeCanvasItemClass *) class;
parent_class = gtk_type_class (gnome_canvas_item_get_type ());
gtk_object_add_arg_type ("GnomeCanvasPixbuf::pixbuf",
GTK_TYPE_POINTER, GTK_ARG_READWRITE, ARG_PIXBUF);
gtk_object_add_arg_type ("GnomeCanvasPixbuf::width",
GTK_TYPE_DOUBLE, GTK_ARG_READWRITE, ARG_WIDTH);
gtk_object_add_arg_type ("GnomeCanvasPixbuf::width_set",
GTK_TYPE_BOOL, GTK_ARG_READWRITE, ARG_WIDTH_SET);
gtk_object_add_arg_type ("GnomeCanvasPixbuf::width_pixels",
GTK_TYPE_BOOL, GTK_ARG_READWRITE, ARG_WIDTH_PIXELS);
gtk_object_add_arg_type ("GnomeCanvasPixbuf::height",
GTK_TYPE_DOUBLE, GTK_ARG_READWRITE, ARG_HEIGHT);
gtk_object_add_arg_type ("GnomeCanvasPixbuf::height_set",
GTK_TYPE_BOOL, GTK_ARG_READWRITE, ARG_HEIGHT_SET);
gtk_object_add_arg_type ("GnomeCanvasPixbuf::height_pixels",
GTK_TYPE_BOOL, GTK_ARG_READWRITE, ARG_HEIGHT_PIXELS);
object_class->destroy = gnome_canvas_pixbuf_destroy;
object_class->set_arg = gnome_canvas_pixbuf_set_arg;
object_class->get_arg = gnome_canvas_pixbuf_get_arg;
item_class->update = gnome_canvas_pixbuf_update;
item_class->draw = gnome_canvas_pixbuf_draw;
item_class->point = gnome_canvas_pixbuf_point;
item_class->bounds = gnome_canvas_pixbuf_bounds;
}
/* Object initialization function for the pixbuf canvas item */
static void
gnome_canvas_pixbuf_init (GnomeCanvasPixbuf *gcp)
{
PixbufPrivate *priv;
priv = g_new0 (PixbufPrivate, 1);
gcp->priv = priv;
priv->width = 0.0;
priv->height = 0.0;
}
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/* Destroy handler for the pixbuf canvas item */
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static void
gnome_canvas_pixbuf_destroy (GtkObject *object)
{
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GnomeCanvasPixbuf *gcp;
PixbufPrivate *priv;
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g_return_if_fail (object != NULL);
g_return_if_fail (GNOME_IS_CANVAS_PIXBUF (object));
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gcp = (GNOME_CANVAS_PIXBUF (object));
priv = gcp->priv;
/* FIXME: redraw area */
if (priv->pixbuf)
gdk_pixbuf_unref (priv->pixbuf);
g_free (priv);
if (GTK_OBJECT_CLASS (parent_class)->destroy)
(* GTK_OBJECT_CLASS (parent_class)->destroy) (object);
}
/* Set_arg handler for the pixbuf canvas item */
static void
gnome_canvas_pixbuf_set_arg (GtkObject *object, GtkArg *arg, guint arg_id)
{
GnomeCanvasItem *item;
GnomeCanvasPixbuf *gcp;
PixbufPrivate *priv;
GdkPixbuf *pixbuf;
double val;
item = GNOME_CANVAS_ITEM (object);
gcp = GNOME_CANVAS_PIXBUF (object);
priv = gcp->priv;
switch (arg_id) {
case ARG_PIXBUF:
pixbuf = GTK_VALUE_POINTER (*arg);
if (pixbuf != priv->pixbuf) {
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if (pixbuf) {
g_return_if_fail (pixbuf->art_pixbuf->format != ART_PIX_RGB);
g_return_if_fail (pixbuf->art_pixbuf->n_channels == 3
|| pixbuf->art_pixbuf->n_channels == 4);
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)
gdk_pixbuf_unref (priv->pixbuf);
priv->pixbuf = pixbuf;
}
priv->need_pixbuf_update = TRUE;
gnome_canvas_item_request_update (item);
break;
case ARG_WIDTH:
val = GTK_VALUE_DOUBLE (*arg);
g_return_if_fail (val >= 0.0);
priv->width = val;
priv->need_size_update = TRUE;
gnome_canvas_item_request_update (item);
break;
case ARG_WIDTH_SET:
priv->width_set = GTK_VALUE_BOOL (*arg) ? TRUE : FALSE;
priv->need_size_update = TRUE;
gnome_canvas_item_request_update (item);
break;
case ARG_WIDTH_PIXELS:
priv->width_pixels = GTK_VALUE_BOOL (*arg) ? TRUE : FALSE;
priv->need_size_update = TRUE;
gnome_canvas_item_request_update (item);
break;
case ARG_HEIGHT:
val = GTK_VALUE_DOUBLE (*arg);
g_return_if_fail (val >= 0.0);
priv->height = val;
priv->need_size_update = TRUE;
gnome_canvas_item_request_update (item);
break;
case ARG_HEIGHT_SET:
priv->height_set = GTK_VALUE_BOOL (*arg) ? TRUE : FALSE;
priv->need_size_update = TRUE;
gnome_canvas_item_request_update (item);
break;
case ARG_HEIGHT_PIXELS:
priv->height_pixels = GTK_VALUE_BOOL (*arg) ? TRUE : FALSE;
priv->need_size_update = TRUE;
gnome_canvas_item_request_update (item);
break;
default:
break;
}
}
/* Get_arg handler for the pixbuf canvasi item */
static void
gnome_canvas_pixbuf_get_arg (GtkObject *object, GtkArg *arg, guint arg_id)
{
GnomeCanvasItem *item;
GnomeCanvasPixbuf *gcp;
PixbufPrivate *priv;
item = GNOME_CANVAS_ITEM (object);
gcp = GNOME_CANVAS_PIXBUF (object);
priv = gcp->priv;
switch (arg_id) {
case ARG_PIXBUF:
GTK_VALUE_POINTER (*arg) = priv->pixbuf;
break;
case ARG_WIDTH:
GTK_VALUE_DOUBLE (*arg) = priv->width;
break;
case ARG_WIDTH_SET:
GTK_VALUE_BOOL (*arg) = priv->width_set;
break;
case ARG_WIDTH_PIXELS:
GTK_VALUE_BOOL (*arg) = priv->width_pixels;
break;
case ARG_HEIGHT:
GTK_VALUE_DOUBLE (*arg) = priv->height;
break;
case ARG_HEIGHT_SET:
GTK_VALUE_BOOL (*arg) = priv->height_set;
break;
case ARG_HEIGHT_PIXELS:
GTK_VALUE_BOOL (*arg) = priv->height_pixels;
break;
default:
arg->type = GTK_TYPE_INVALID;
break;
}
}
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/* Bounds and utilities */
/* Computes horizontal and vertical scaling vectors for the final transformation
* to canvas pixel coordinates 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
compute_xform_vectors (GnomeCanvasPixbuf *gcp, double *i2c, ArtPoint *i_c, ArtPoint *j_c)
{
PixbufPrivate *priv;
ArtPoint orig, orig_c;
ArtPoint i, j;
double length;
priv = gcp->priv;
/* Our origin */
orig.x = 0.0;
orig.y = 0.0;
art_affine_point (&orig_c, &orig, i2c);
/* Horizontal and vertical vectors */
i.x = 1.0;
i.y = 0.0;
art_affine_point (&i_c, &i, i2c);
i_c.x -= orig_c.x;
i_c.y -= orig_c.y;
j.x = 0.0;
j.y = 1.0;
art_affine_point (&j_c, &j, i2c);
j_c.x -= orig_c.x;
j_c.y -= orig_c.y;
/* Compute the scaling vectors. If a dimension is specified in pixels,
* we normalize the base vector first so that it will represent the size
* in pixels when scaled.
*/
if (priv->width_pixels) {
length = sqrt (i_c.x * i_c.x + i_c.y * i_c.y);
if (length > GNOME_CANVAS_EPSILON) {
i_c->x /= length;
i_c->y /= length;
} else
i_c->x = i_c->y = 0.0;
}
if (priv->height_pixels) {
length = sqrt (j_c.x * j_c.x + j_c.y * j_c.y);
if (length > GNOME_CANVAS_EPSILON) {
j_c->x /= length;
j_c->y /= length;
} else
j_c->x = j_c->y = 0.0;
}
}
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/* 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];
ArtPoint orig, orig_c;
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ArtPoint i_c, j_c;
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double w, h;
double length;
double x1, y1, x2, y2, x3, y3, x4, y4;
double mx1, my1, mx2, my2;
item = GNOME_CANVAS_ITEM (gcp);
priv = gcp->priv;
if (!priv->pixbuf) {
item->x1 = item->y1 = item->x2 = item->y2 = 0.0;
return;
}
gnome_canvas_item_i2c_affine (item, i2c);
/* Our "origin" */
orig.x = 0.0;
orig.y = 0.0;
art_affine_point (&orig_c, &orig, i2c);
/* Horizontal and vertical vectors */
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compute_xform_vectors (gcp, i2c, &i_c, &j_c);
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/* Width vector */
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if (priv->width_set)
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w = priv->width;
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else if (priv->pixbuf)
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w = priv->pixbuf->art_pixbuf->width;
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else
w = 0.0;
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i_c.x *= w;
i_c.y *= w;
/* Height */
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if (priv->height_set)
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h = priv->height;
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else if (priv->pixbuf)
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h = priv->pixbuf->art_pixbuf->height;
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else
h = 0.0;
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j_c.x *= h;
j_c.y *= h;
/* Compute vertices */
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x1 = orig_c.x;
y1 = orig_c.y;
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x2 = orig_c.x + i_c.x;
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y2 = orig_c.y + i_c.y;
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x3 = orig_c.x + j_c.x;
y3 = orig_c.y + j_c.y;
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x4 = orig_c.x + i_c.x + j_c.x;
y4 = orig_c.y + i_c.y + j_c.y;
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/* Compute bounds */
mx1 = MIN (x1, x2);
my1 = MIN (y1, y2);
mx2 = MAX (x3, x4);
my2 = MAX (y3, y4);
if (mx1 < mx2) {
item->x1 = mx1;
item->x2 = mx2;
} else {
item->x1 = mx2;
item->x2 = mx1;
}
if (my1 < my2) {
item->y1 = my1;
item->y2 = my2;
} else {
item->y1 = my2;
item->y2 = my1;
}
}
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/* Update sequence */
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/* 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_size_update)
gnome_canvas_request_redraw (item, 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_size_update
|| ((flags & GNOME_CANVAS_UPDATE_VISIBILITY)
&& (GTK_OBJECT_FLAGS (ii) & 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_size_update = FALSE;
}
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}
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/* Rendering */
/* 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_x1 = x + width;
art_affine_run (&run_x1, &run_x2, yy + y,
apb->width, apb->height,
inv);
d = dest + yy * rowstride + (run_x1 - x) * 4;
for (xx = run_x0; xx < run-x1; xx++) {
dest_p.x = x + 0.5;
art_affine_point (&src_p, &dest_p, inv);
src_x = floor (src_p.x + 0.5);
src_y = floor (src_p.y + 0.5);
src = apb->pixels + src_y * apb->rowstride + src_x * apb->num_channels;
for (i = 0; i < apb->num_channels; i++)
*d++ = *src++;
if (!apb->has_alpha)
d++; /* It is already zeroed */
}
}
}
/* 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];
ArtPoint i_c, j_c;
double i_len, j_len;
double scale[6], final[6];
guchar *buf;
GdkPixbuf *pixbuf;
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gcp = GNOME_CANVAS_PIXBUF (item);
priv = gcp->priv;
if (!priv->pixbuf)
return;
/* Compute scaling factors and build the final affine */
gnome_canvas_item_i2c_affine (item, i2c);
compute_xform_vectors (gcp, i2c, &i_c, &j_c);
i_len = sqrt (i_c.x * i_c.x + i_c.y * i_c.y);
j_len = sqrt (j_c.x * j_c.x + j_c.y * j_c.y);
art_affine_scale (scale, i_len, j_len);
art_affine_multiply (final, i2c, scale);
buf = g_new0 (guchar, width * height * 4);
transform_pixbuf (buf, x, y, width, height, width * 4, priv->pixbuf, final);
pixbuf = gdk_pixbuf_new_from_data (buf, ART_PIX_RGB, TRUE,
width, height, width * 4,
NULL, NULL);
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gdk_pixbuf_render_to_drawable_alpha (pixbuf, drawable,
0, 0,
0, 0,
width, height,
GDK_PIXBUF_ALPHA_BILEVEL,
127,
GDK_RGB_DITHER_MAX,
x, y);
gdk_pixbuf_unref (pixbuf);
g_free (buf);
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}
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/* 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;
gcp = GNOME_CANVAS_PIXBUF (item);
priv = gcp->priv;
}