Create rrtransform.[ch]. Add RRTransform argument to RRCrtcNotify.

Instead of using a separate function to notify DIX about transform changes,
add the transform to RRCrtcNotify so that the whole Crtc state changes
atomically.

1 files changed, 259 insertions, 0 deletions

diff --git a/randr/rrtransform.c b/randr/rrtransform.c
new file mode 100644
index 000000000..f9934d766
--- /dev/null
+++ b/randr/rrtransform.c
@@ -0,0 +1,259 @@
+/*
+ * Copyright © 2007 Keith Packard
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and its
+ * documentation for any purpose is hereby granted without fee, provided that
+ * the above copyright notice appear in all copies and that both that copyright
+ * notice and this permission notice appear in supporting documentation, and
+ * that the name of the copyright holders not be used in advertising or
+ * publicity pertaining to distribution of the software without specific,
+ * written prior permission.  The copyright holders make no representations
+ * about the suitability of this software for any purpose.  It is provided "as
+ * is" without express or implied warranty.
+ *
+ * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+ * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
+ * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
+ * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
+ * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+ * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
+ * OF THIS SOFTWARE.
+ */
+
+#include "rrtransform.h"
+
+void
+RRTransformInit (RRTransformPtr transform)
+{
+    PictureTransformInitIdentity (&transform->transform);
+    pict_f_transform_init_identity (&transform->f_transform);
+    pict_f_transform_init_identity (&transform->f_inverse);
+    transform->filter = NULL;
+    transform->params = NULL;
+    transform->nparams = 0;
+}
+
+void
+RRTransformFini (RRTransformPtr transform)
+{
+    if (transform->params)
+	xfree (transform->params);
+}
+
+Bool
+RRTransformEqual (RRTransformPtr a, RRTransformPtr b)
+{
+    if (a && PictureTransformIsIdentity (&a->transform))
+	a = NULL;
+    if (b && PictureTransformIsIdentity (&b->transform))
+	b = NULL;
+    if (a == NULL && b == NULL)
+	return TRUE;
+    if (a == NULL || b == NULL)
+	return FALSE;
+    if (memcmp (&a->transform, &b->transform, sizeof (a->transform)) != 0)
+	return FALSE;
+    if (a->filter != b->filter)
+	return FALSE;
+    if (a->nparams != b->nparams)
+	return FALSE;
+    if (memcmp (a->params, b->params, a->nparams * sizeof (xFixed)) != 0)
+	return FALSE;
+    return TRUE;
+}
+
+Bool
+RRTransformSetFilter (RRTransformPtr	dst,
+		      PictFilterPtr	filter,
+		      xFixed		*params,
+		      int		nparams,
+		      int		width,
+		      int		height)
+{
+    xFixed  *new_params;
+
+    if (nparams)
+    {
+	new_params = xalloc (nparams * sizeof (xFixed));
+	if (!new_params)
+	    return FALSE;
+	memcpy (new_params, params, nparams * sizeof (xFixed));
+    }
+    else
+	new_params = NULL;
+    if (dst->params)
+	xfree (dst->params);
+    dst->filter = filter;
+    dst->params = new_params;
+    dst->nparams = nparams;
+    dst->width = width;
+    dst->height = height;
+    return TRUE;
+}
+
+Bool
+RRTransformCopy (RRTransformPtr dst, RRTransformPtr src)
+{
+    if (src && PictureTransformIsIdentity (&src->transform))
+	src = NULL;
+
+    if (src)
+    {
+	if (!RRTransformSetFilter (dst, src->filter,
+				   src->params, src->nparams, src->width, src->height))
+	    return FALSE;
+	dst->transform = src->transform;
+	dst->f_transform = src->f_transform;
+	dst->f_inverse = src->f_inverse;
+    }
+    else
+    {
+	if (!RRTransformSetFilter (dst, NULL, NULL, 0, 0, 0))
+	    return FALSE;
+	PictureTransformInitIdentity (&dst->transform);
+	pict_f_transform_init_identity (&dst->f_transform);
+	pict_f_transform_init_identity (&dst->f_inverse);
+    }
+    return TRUE;
+}
+
+#define F(x)	IntToxFixed(x)
+
+/*
+ * Compute the complete transformation matrix including
+ * client-specified transform, rotation/reflection values and the crtc 
+ * offset.
+ *
+ * Return TRUE if the resulting transform is not a simple translation.
+ */
+Bool
+RRTransformCompute (int			    x,
+		    int			    y,
+		    int			    width,
+		    int			    height,
+		    Rotation		    rotation,
+		    RRTransformPtr	    rr_transform,
+
+		    PictTransformPtr	    transform,
+		    struct pict_f_transform *f_transform,
+		    struct pict_f_transform *f_inverse)
+{
+    PictTransform	    t_transform, inverse;
+    struct pict_f_transform tf_transform, tf_inverse;
+
+    if (!transform) transform = &t_transform;
+    if (!f_transform) f_transform = &tf_transform;
+    if (!f_inverse) f_inverse = &tf_inverse;
+
+    PictureTransformInitIdentity (transform);
+    PictureTransformInitIdentity (&inverse);
+    pict_f_transform_init_identity (f_transform);
+    pict_f_transform_init_identity (f_inverse);
+    if (rotation != RR_Rotate_0)
+    {
+	double	f_rot_cos, f_rot_sin, f_rot_dx, f_rot_dy;
+	double	f_scale_x, f_scale_y, f_scale_dx, f_scale_dy;
+	xFixed	rot_cos, rot_sin, rot_dx, rot_dy;
+	xFixed	scale_x, scale_y, scale_dx, scale_dy;
+
+	/* rotation */
+	switch (rotation & 0xf) {
+	default:
+	case RR_Rotate_0:
+	    f_rot_cos = 1;	    f_rot_sin = 0;
+	    f_rot_dx  = 0;	    f_rot_dy  = 0;
+	    rot_cos = F ( 1);	    rot_sin = F ( 0);
+	    rot_dx  = F ( 0);	    rot_dy  = F ( 0);
+	    break;
+	case RR_Rotate_90:
+	    f_rot_cos = 0;	    f_rot_sin = 1;
+	    f_rot_dx  = height;	    f_rot_dy  = 0;
+	    rot_cos = F ( 0);	    rot_sin = F ( 1);
+	    rot_dx =  F ( height);  rot_dy  = F (0);
+	    break;
+	case RR_Rotate_180:
+	    f_rot_cos = -1;	    f_rot_sin = 0;
+	    f_rot_dx  = width;	    f_rot_dy  = height;
+	    rot_cos = F (-1);	    rot_sin = F ( 0);
+	    rot_dx  = F (width);   rot_dy  = F ( height);
+	    break;
+	case RR_Rotate_270:
+	    f_rot_cos = 0;	    f_rot_sin = -1;
+	    f_rot_dx  = 0;	    f_rot_dy  = width;
+	    rot_cos = F ( 0);	    rot_sin = F (-1);
+	    rot_dx  = F ( 0);	    rot_dy  = F ( width);
+	    break;
+	}
+	
+	PictureTransformRotate (transform, &inverse, rot_cos, rot_sin);
+	PictureTransformTranslate (transform, &inverse, rot_dx, rot_dy);
+	pict_f_transform_rotate (f_transform, f_inverse, f_rot_cos, f_rot_sin);
+	pict_f_transform_translate (f_transform, f_inverse, f_rot_dx, f_rot_dy);
+
+	/* reflection */
+	f_scale_x = 1;
+	f_scale_dx = 0;
+	f_scale_y = 1;
+	f_scale_dy = 0;
+	scale_x = F (1);
+	scale_dx = 0;
+	scale_y = F (1);
+	scale_dy = 0;
+	if (rotation & RR_Reflect_X)
+	{
+	    f_scale_x = -1;
+	    scale_x = F(-1);
+	    if (rotation & (RR_Rotate_0|RR_Rotate_180)) {
+		f_scale_dx = width;
+		scale_dx = F(width);
+	    } else {
+		f_scale_dx = height;
+		scale_dx = F(height);
+	    }
+	}
+	if (rotation & RR_Reflect_Y)
+	{
+	    f_scale_y = -1;
+	    scale_y = F(-1);
+	    if (rotation & (RR_Rotate_0|RR_Rotate_180)) {
+		f_scale_dy = height;
+		scale_dy = F(height);
+	    } else {
+		f_scale_dy = width;
+		scale_dy = F(width);
+	    }
+	}
+	
+	PictureTransformScale (transform, &inverse, scale_x, scale_y);
+	pict_f_transform_scale (f_transform, f_inverse, f_scale_x, f_scale_y);
+	PictureTransformTranslate (transform, &inverse, scale_dx, scale_dy);
+	pict_f_transform_translate (f_transform, f_inverse, f_scale_dx, f_scale_dy);
+    }
+    
+#ifdef RANDR_12_INTERFACE
+    if (rr_transform)
+    {
+        PictureTransformMultiply (transform, transform, &rr_transform->transform);
+	pict_f_transform_multiply (f_transform, f_transform, &rr_transform->f_transform);
+	pict_f_transform_multiply (f_inverse, &rr_transform->f_inverse, f_inverse);
+    }
+#endif
+    /*
+     * Compute the class of the resulting transform
+     */
+    if (PictureTransformIsIdentity (transform))
+    {
+	PictureTransformInitTranslate (transform, F ( x), F ( y));
+
+	pict_f_transform_init_translate (f_transform, F( x), F( y));
+	pict_f_transform_init_translate (f_inverse,   F(-x), F(-y));
+	return FALSE;
+    }
+    else
+    {
+	PictureTransformTranslate (&inverse, transform, x, y);
+	pict_f_transform_translate (f_inverse, f_transform, x, y);
+	return TRUE;
+    }
+}
+