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implement the bounds method correctly. (compute_viewport_affine): compute

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1999-11-17  Larry Ewing  <lewing@gimp.org>

	* src/gnome-canvas-pixbuf.c (gnome_canvas_pixbuf_bounds):
	implement the bounds method correctly.
	(compute_viewport_affine): compute the affine need to fit the
	image within the viewport given by the args.
	(compute_render_affine): call compute_viewport_affine.
This commit is contained in:
Larry Ewing 1999-11-17 23:21:34 +00:00 committed by Larry Ewing
parent 974e54fc9a
commit 36a27c6759
2 changed files with 48 additions and 24 deletions
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8
gdk-pixbuf/ChangeLog
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@ -1,3 +1,11 @@
1999-11-17 Larry Ewing <lewing@gimp.org>
* src/gnome-canvas-pixbuf.c (gnome_canvas_pixbuf_bounds):
implement the bounds method correctly.
(compute_viewport_affine): compute the affine need to fit the
image within the viewport given by the args.
(compute_render_affine): call compute_viewport_affine.
1999-11-16 Havoc Pennington <hp@pobox.com>
* src/gdk-pixbuf-drawable.h: Use includes from the current

64
gdk-pixbuf/gnome-canvas-pixbuf.c
View File

@ -454,20 +454,19 @@ compute_xform_scaling (double *affine, ArtPoint *i_c, ArtPoint *j_c)
j_c->y -= orig_c.y;
}
/* 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.
/* computes the addtional resolution dependent affine needed to
* fit the image within its viewport defined by x,y,width and height
* args
*/
static void
compute_render_affine (GnomeCanvasPixbuf *gcp, double *render_affine, double *i2c)
compute_viewport_affine (GnomeCanvasPixbuf *gcp, double *viewport_affine, double *i2c)
{
PixbufPrivate *priv;
ArtPoint i_c, j_c;
double i_len, j_len;
double si_len, sj_len;
double ti_len, tj_len;
double scale[6], translate[6], composite[6];
double scale[6], translate[6];
double w, h;
double x, y;
@ -548,8 +547,21 @@ compute_render_affine (GnomeCanvasPixbuf *gcp, double *render_affine, double *i2
art_affine_scale (scale, si_len, sj_len);
art_affine_translate (translate, ti_len, tj_len);
art_affine_multiply (composite, scale, translate);
art_affine_multiply (render_affine, composite, i2c);
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
@ -809,25 +821,29 @@ gnome_canvas_pixbuf_bounds (GnomeCanvasItem *item, double *x1, double *y1, doubl
{
GnomeCanvasPixbuf *gcp;
PixbufPrivate *priv;
double i2c[6], viewport_affine[6];
ArtDRect rect;
gcp = GNOME_CANVAS_PIXBUF (item);
priv = gcp->priv;
*x1 = 0.0;
*y1 = 0.0;
if (priv->pixbuf) {
if (priv->width_set)
*x2 = priv->width;
else
*x2 = priv->pixbuf->art_pixbuf->width;
if (priv->height_set)
*y2 = priv->height;
else
*y2 = priv->pixbuf->art_pixbuf->height;
} else {
*x2 = 0.0;
*y2 = 0.0;
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;
}