Implemented the ::point() method. We do a simple containment test instead

1999-11-02  Federico Mena Quintero  <federico@redhat.com>

	* src/gnome-canvas-pixbuf.c (gnome_canvas_pixbuf_point):
	Implemented the ::point() method.  We do a simple containment test
	instead of a full distance calculation since the canvas is going
	to change to that scheme, anyways.

1 files changed, 57 insertions, 30 deletions

diff --git a/gdk-pixbuf/gnome-canvas-pixbuf.c b/gdk-pixbuf/gnome-canvas-pixbuf.c
index 7f77eda8d8..bf45512d79 100644
--- a/gdk-pixbuf/gnome-canvas-pixbuf.c
+++ b/gdk-pixbuf/gnome-canvas-pixbuf.c
@@ -22,6 +22,8 @@
 
 #include <config.h>
 #include <math.h>
+#include <libgnomeui/gnome-canvas.h>
+#include <libgnomeui/gnome-canvas-util.h>
 #include "gdk-pixbuf.h"
 #include "gnome-canvas-pixbuf.h"
 #include "libart_lgpl/art_rgb_pixbuf_affine.h"
@@ -76,11 +78,11 @@ 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 void gnome_canvas_pixbuf_render (GnomeCanvasItem *item, GnomeCanvasBuf *buf);
 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);
-static void gnome_canvas_pixbuf_render (GnomeCanvasItem *item, GnomeCanvasBuf *buf);
 
 static GnomeCanvasItemClass *parent_class;
 
@@ -152,9 +154,9 @@ gnome_canvas_pixbuf_class_init (GnomeCanvasPixbufClass *class)
 
 	item_class->update = gnome_canvas_pixbuf_update;
 	item_class->draw = gnome_canvas_pixbuf_draw;
+	item_class->render = gnome_canvas_pixbuf_render;
 	item_class->point = gnome_canvas_pixbuf_point;
 	item_class->bounds = gnome_canvas_pixbuf_bounds;
-	item_class->render = gnome_canvas_pixbuf_render;
 }
 
 /* Object initialization function for the pixbuf canvas item */
@@ -674,34 +676,6 @@ transform_pixbuf (guchar *dest, int x, int y, int width, int height, int rowstri
 	}
 }
 
-/* Render 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;
-}
-
 /* Draw handler for the pixbuf canvas item */
 static void
 gnome_canvas_pixbuf_draw (GnomeCanvasItem *item, GdkDrawable *drawable,
@@ -742,6 +716,34 @@ gnome_canvas_pixbuf_draw (GnomeCanvasItem *item, GdkDrawable *drawable,
 	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 */
@@ -753,12 +755,23 @@ gnome_canvas_pixbuf_point (GnomeCanvasItem *item, double x, double y, int cx, in
 	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);
@@ -766,7 +779,21 @@ gnome_canvas_pixbuf_point (GnomeCanvasItem *item, double x, double y, int cx, in
 	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 TRUE;
+
+	src = apb->pixels + py * apb->rowstride + px * apb->n_channels;
+
+	if (src[3] < 128)
+		return no_hit;
+	else
+		return 0.0;
 }