[xrandr v2] Select NearestNeighbour filtering for pixel exact scaling

Chris Wilson chris at chris-wilson.co.uk
Mon Apr 4 20:34:59 UTC 2016


When using pixel-exact scaling from for example running a 3840x2160 monitor
at 1920x1080 half-resolution upscaling using a bilinear filter
introduces blur where none is expected.

v2: Allow the user to specify what filter they want using --filter, but
default to automatic selection.

References: https://bugs.freedesktop.org/show_bug.cgi?id=94816
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 configure.ac |   2 +-
 xrandr.c     | 275 +++++++++++++++++++++++++++++++++++++++++------------------
 2 files changed, 192 insertions(+), 85 deletions(-)

diff --git a/configure.ac b/configure.ac
index dcf7c10..95cc1f6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -39,7 +39,7 @@ XORG_DEFAULT_OPTIONS
 AC_CHECK_LIB(m,floor)
 
 # Checks for pkg-config packages
-PKG_CHECK_MODULES(XRANDR, xrandr >= 1.5 xrender x11 xproto >= 7.0.17)
+PKG_CHECK_MODULES(XRANDR, xrandr >= 1.5 xrender x11 xproto >= 7.0.17 pixman-1)
 
 AC_CONFIG_FILES([
 	Makefile
diff --git a/xrandr.c b/xrandr.c
index dcfdde0..5c3a326 100644
--- a/xrandr.c
+++ b/xrandr.c
@@ -40,6 +40,7 @@
 #include <inttypes.h>
 #include <stdarg.h>
 #include <math.h>
+#include <pixman.h>
 
 #ifdef HAVE_CONFIG_H
 #include "config.h"
@@ -135,6 +136,7 @@ usage(void)
            "      --scale <x>x<y>\n"
            "      --scale-from <w>x<h>\n"
            "      --transform <a>,<b>,<c>,<d>,<e>,<f>,<g>,<h>,<i>\n"
+           "      --filter auto,bilinear,nearest\n"
            "      --off\n"
            "      --crtc <crtc>\n"
            "      --panning <w>x<h>[+<x>+<y>[/<track:w>x<h>+<x>+<y>[/<border:l>/<t>/<r>/<b>]]]\n"
@@ -285,6 +287,7 @@ typedef enum _changes {
     changes_panning = (1 << 10),
     changes_gamma = (1 << 11),
     changes_primary = (1 << 12),
+    changes_filter = (1 << 13),
 } changes_t;
 
 typedef enum _name_kind {
@@ -305,19 +308,24 @@ typedef struct {
 typedef struct _crtc crtc_t;
 typedef struct _output	output_t;
 typedef struct _transform transform_t;
+typedef struct _filter filter_t;
 typedef struct _umode	umode_t;
 typedef struct _output_prop output_prop_t;
 typedef struct _provider provider_t;
 typedef struct _monitors monitors_t;
 typedef struct _umonitor umonitor_t;
 
-struct _transform {
-    XTransform	    transform;
+struct _filter {
     const char	    *filter;
     int		    nparams;
     XFixed	    *params;
 };
 
+
+struct _transform {
+    XTransform	    transform;
+};
+
 struct _crtc {
     name_t	    crtc;
     Bool	    changing;
@@ -331,6 +339,7 @@ struct _crtc {
     output_t	    **outputs;
     int		    noutput;
     transform_t	    current_transform, pending_transform;
+    filter_t        current_filter, pending_filter;
 };
 
 struct _output_prop {
@@ -370,6 +379,7 @@ struct _output {
     Bool    	    automatic;
     int     	    scale_from_w, scale_from_h;
     transform_t	    transform;
+    filter_t        filter;
 
     struct {
 	float red;
@@ -707,19 +717,29 @@ init_transform (transform_t *transform)
     memset (&transform->transform, '\0', sizeof (transform->transform));
     for (x = 0; x < 3; x++)
 	transform->transform.matrix[x][x] = XDoubleToFixed (1.0);
-    transform->filter = "";
-    transform->nparams = 0;
-    transform->params = NULL;
+}
+
+static void
+init_filter (filter_t *filter)
+{
+    filter->filter = "";
+    filter->nparams = 0;
+    filter->params = NULL;
 }
 
 static void
 set_transform (transform_t  *dest,
-	       XTransform   *transform,
-	       const char   *filter,
-	       XFixed	    *params,
-	       int	    nparams)
+	       XTransform   *transform)
 {
     dest->transform = *transform;
+}
+
+static void
+set_filter (filter_t    *dest,
+	    const char  *filter,
+	    XFixed      *params,
+	    int          nparams)
+{
     /* note: this string is leaked */
     dest->filter = strdup (filter);
     dest->nparams = nparams;
@@ -728,10 +748,25 @@ set_transform (transform_t  *dest,
 }
 
 static void
+auto_filter (output_t *output)
+{
+    if ((output->changes & changes_filter) == 0) {
+        init_filter (&output->filter);
+        output->filter.filter = "auto";
+        output->changes |= changes_filter;
+    }
+}
+
+static void
 copy_transform (transform_t *dest, transform_t *src)
 {
-    set_transform (dest, &src->transform,
-		   src->filter, src->params, src->nparams);
+    set_transform (dest, &src->transform);
+}
+
+static void
+copy_filter (filter_t *dest, filter_t *src)
+{
+    set_filter(dest, src->filter, src->params, src->nparams);
 }
 
 static Bool
@@ -739,6 +774,12 @@ equal_transform (transform_t *a, transform_t *b)
 {
     if (memcmp (&a->transform, &b->transform, sizeof (XTransform)) != 0)
 	return False;
+    return True;
+}
+
+static Bool
+equal_filter (filter_t *a, filter_t *b)
+{
     if (strcmp (a->filter, b->filter) != 0)
 	return False;
     if (a->nparams != b->nparams)
@@ -1157,6 +1198,40 @@ set_gamma_info(output_t *output)
     XRRFreeGamma(crtc_gamma);
 }
 
+static Bool
+pixel_exact(const XTransform *t)
+{
+    struct pixman_transform inv;
+
+    if (!pixman_transform_invert(&inv, (struct pixman_transform *)t))
+        return False;
+
+    /* Any perspective scaling? */
+    if ((inv.matrix[2][0] | inv.matrix[2][1] | inv.matrix[2][2]) != 0x10000)
+        return False;
+
+    /* Any non-integer translation? */
+    if ((inv.matrix[0][2] | inv.matrix[1][2]) & 0xffff)
+        return False;
+
+    /* Rotation? */
+    if (inv.matrix[0][1] | inv.matrix[1][0]) {
+        if (inv.matrix[0][0] | inv.matrix[1][1])
+            return False;
+
+        if ((inv.matrix[1][0] | inv.matrix[0][1]) & 0xffff)
+            return False;
+    } else {
+        if (inv.matrix[1][0] | inv.matrix[0][1])
+            return False;
+
+        if ((inv.matrix[0][0] | inv.matrix[1][1]) & 0xffff)
+            return False;
+    }
+
+    return True;
+}
+
 static void
 set_output_info (output_t *output, RROutput xid, XRROutputInfo *output_info)
 {
@@ -1303,15 +1378,29 @@ set_output_info (output_t *output, RROutput xid, XRROutputInfo *output_info)
 	    output->transform.transform.matrix[0][0] = XDoubleToFixed (sx);
 	    output->transform.transform.matrix[1][1] = XDoubleToFixed (sy);
 	    output->transform.transform.matrix[2][2] = XDoubleToFixed (1.0);
-	    if (sx != 1 || sy != 1)
-		output->transform.filter = "bilinear";
-	    else
-		output->transform.filter = "nearest";
-	    output->transform.nparams = 0;
-	    output->transform.params = NULL;
 	}
     }
 
+    if (!(output->changes & changes_filter))
+    {
+	if (output->crtc_info)
+	    copy_filter (&output->filter, &output->crtc_info->current_filter);
+	else
+	    init_filter (&output->filter);
+    }
+    else
+    {
+	if (strcmp(output->filter.filter, "auto") == 0)
+        {
+	    if (pixel_exact(&output->transform.transform))
+		output->filter.filter = "nearest";
+	    else
+		output->filter.filter = "bilinear";
+	    if (verbose)
+		printf("Using %s filter\n", output->filter.filter);
+        }
+    }
+
     /* set primary */
     if (!(output->changes & changes_primary))
 	output->primary = output_is_primary(output);
@@ -1376,7 +1465,8 @@ get_crtcs (void)
 	}
 	if (XRRGetCrtcTransform (dpy, res->crtcs[c], &attr) && attr) {
 	    set_transform (&crtcs[c].current_transform,
-			   &attr->currentTransform,
+			   &attr->currentTransform);
+            set_filter(&crtcs[c].current_filter,
 			   attr->currentFilter,
 			   attr->currentParams,
 			   attr->currentNparams);
@@ -1385,8 +1475,10 @@ get_crtcs (void)
 	else
 	{
 	    init_transform (&crtcs[c].current_transform);
+	    init_filter (&crtcs[c].current_filter);
 	}
 	copy_transform (&crtcs[c].pending_transform, &crtcs[c].current_transform);
+	copy_filter (&crtcs[c].pending_filter, &crtcs[c].current_filter);
    }
 }
 
@@ -1403,6 +1495,7 @@ crtc_add_output (crtc_t *crtc, output_t *output)
 	crtc->rotation = output->rotation;
 	crtc->mode_info = output->mode_info;
 	copy_transform (&crtc->pending_transform, &output->transform);
+	copy_filter (&crtc->pending_filter, &output->filter);
    }
     if (!crtc->outputs) fatal ("out of memory\n");
     crtc->outputs[crtc->noutput++] = output;
@@ -1555,7 +1648,7 @@ crtc_disable (crtc_t *crtc)
 }
 
 static void
-crtc_set_transform (crtc_t *crtc, transform_t *transform)
+crtc_set_transform (crtc_t *crtc, transform_t *transform, filter_t *filter)
 {
     int	major, minor;
 
@@ -1563,9 +1656,9 @@ crtc_set_transform (crtc_t *crtc, transform_t *transform)
     if (major > 1 || (major == 1 && minor >= 3))
 	XRRSetCrtcTransform (dpy, crtc->crtc.xid,
 			     &transform->transform,
-			     transform->filter,
-			     transform->params,
-			     transform->nparams);
+			     filter->filter,
+			     filter->params,
+			     filter->nparams);
 }
 
 static Status
@@ -1579,8 +1672,12 @@ crtc_revert (crtc_t *crtc)
     if (dryrun)
 	return RRSetConfigSuccess;
 
-    if (!equal_transform (&crtc->current_transform, &crtc->pending_transform))
-	crtc_set_transform (crtc, &crtc->current_transform);
+    if (!equal_transform (&crtc->current_transform, &crtc->pending_transform) ||
+        !equal_filter (&crtc->current_filter, &crtc->pending_filter))
+	crtc_set_transform (crtc,
+                            &crtc->current_transform,
+                            &crtc->current_filter);
+
     return XRRSetCrtcConfig (dpy, res, crtc->crtc.xid, CurrentTime,
 			    crtc_info->x, crtc_info->y,
 			    crtc_info->mode, crtc_info->rotation,
@@ -1617,8 +1714,11 @@ crtc_apply (crtc_t *crtc)
 	s = RRSetConfigSuccess;
     else
     {
-	if (!equal_transform (&crtc->current_transform, &crtc->pending_transform))
-	    crtc_set_transform (crtc, &crtc->pending_transform);
+	if (!equal_transform (&crtc->current_transform, &crtc->pending_transform) ||
+            !equal_filter (&crtc->current_filter, &crtc->pending_filter))
+	    crtc_set_transform (crtc,
+                                &crtc->pending_transform,
+                                &crtc->pending_filter);
 	s = XRRSetCrtcConfig (dpy, res, crtc->crtc.xid, CurrentTime,
 			      crtc->x, crtc->y, mode, crtc->rotation,
 			      rr_outputs, crtc->noutput);
@@ -1961,6 +2061,8 @@ check_crtc_for_output (crtc_t *crtc, output_t *output)
 	    return False;
 	if (!equal_transform (&crtc->current_transform, &output->transform))
 	    return False;
+	if (!equal_filter (&crtc->current_filter, &output->filter))
+	    return False;
     }
     else if (crtc->crtc_info->noutput)
     {
@@ -2978,66 +3080,71 @@ main (int argc, char **argv)
 	    setit_1_2 = True;
 	    continue;
 	}
-	if (!strcmp ("--scale", argv[i]))
-	{
-	    double  sx, sy;
-	    if (!config_output) argerr ("%s must be used after --output\n", argv[i]);
-	    if (++i >= argc) argerr ("%s requires an argument\n", argv[i-1]);
-	    if (sscanf (argv[i], "%lfx%lf", &sx, &sy) != 2)
-		argerr ("failed to parse '%s' as a scaling factor\n", argv[i]);
-	    init_transform (&config_output->transform);
-	    config_output->transform.transform.matrix[0][0] = XDoubleToFixed (sx);
-	    config_output->transform.transform.matrix[1][1] = XDoubleToFixed (sy);
-	    config_output->transform.transform.matrix[2][2] = XDoubleToFixed (1.0);
-	    if (sx != 1 || sy != 1)
-		config_output->transform.filter = "bilinear";
-	    else
-		config_output->transform.filter = "nearest";
-	    config_output->transform.nparams = 0;
-	    config_output->transform.params = NULL;
-	    config_output->changes |= changes_transform;
-	    continue;
-	}
-	if (!strcmp ("--scale-from", argv[i]))
-	{
-	    int w, h;
-	    if (!config_output) argerr ("%s must be used after --output\n", argv[i]);
-	    if (++i >= argc) argerr ("%s requires an argument\n", argv[i-1]);
-	    if (sscanf (argv[i], "%dx%d", &w, &h) != 2)
-		argerr ("failed to parse '%s' as a scale-from size\n", argv[i]);
-	    if (w <=0 || h <= 0)
-		argerr ("--scale-from dimensions must be nonnegative\n");
-	    config_output->scale_from_w = w;
-	    config_output->scale_from_h = h;
-	    config_output->changes |= changes_transform;
-	    continue;
-	}
-	if (!strcmp ("--transform", argv[i])) {
-	    double  transform[3][3];
-	    int	    k, l;
+	if (!strcmp ("--filter", argv[i])) {
 	    if (!config_output) argerr ("%s must be used after --output\n", argv[i]);
 	    if (++i >= argc) argerr ("%s requires an argument\n", argv[i-1]);
-	    init_transform (&config_output->transform);
-	    if (strcmp (argv[i], "none") != 0)
-	    {
-		if (sscanf(argv[i], "%lf,%lf,%lf,%lf,%lf,%lf,%lf,%lf,%lf",
-			   &transform[0][0],&transform[0][1],&transform[0][2],
-			   &transform[1][0],&transform[1][1],&transform[1][2],
-			   &transform[2][0],&transform[2][1],&transform[2][2])
-		    != 9)
-		    argerr ("failed to parse '%s' as a transformation\n", argv[i]);
-		init_transform (&config_output->transform);
-		for (k = 0; k < 3; k++)
-		    for (l = 0; l < 3; l++) {
-			config_output->transform.transform.matrix[k][l] = XDoubleToFixed (transform[k][l]);
-		    }
-		config_output->transform.filter = "bilinear";
-		config_output->transform.nparams = 0;
-		config_output->transform.params = NULL;
+	    if (strcmp ("auto", argv[i]) == 0 ||
+		strcmp ("nearest", argv[i]) == 0 ||
+		strcmp ("bilinear", argv[i]) == 0) {
+		init_filter (&config_output->filter);
+		config_output->filter.filter = argv[i];
+		config_output->changes |= changes_filter;
 	    }
-	    config_output->changes |= changes_transform;
-	    continue;
 	}
+	if (!strcmp ("--scale", argv[i]))
+        {
+            double  sx, sy;
+            if (!config_output) argerr ("%s must be used after --output\n", argv[i]);
+            if (++i >= argc) argerr ("%s requires an argument\n", argv[i-1]);
+            if (sscanf (argv[i], "%lfx%lf", &sx, &sy) != 2)
+                argerr ("failed to parse '%s' as a scaling factor\n", argv[i]);
+            init_transform (&config_output->transform);
+            config_output->transform.transform.matrix[0][0] = XDoubleToFixed (sx);
+            config_output->transform.transform.matrix[1][1] = XDoubleToFixed (sy);
+            config_output->transform.transform.matrix[2][2] = XDoubleToFixed (1.0);
+            config_output->changes |= changes_transform;
+            auto_filter (config_output);
+            continue;
+        }
+        if (!strcmp ("--scale-from", argv[i]))
+        {
+            int w, h;
+            if (!config_output) argerr ("%s must be used after --output\n", argv[i]);
+            if (++i >= argc) argerr ("%s requires an argument\n", argv[i-1]);
+            if (sscanf (argv[i], "%dx%d", &w, &h) != 2)
+                argerr ("failed to parse '%s' as a scale-from size\n", argv[i]);
+            if (w <=0 || h <= 0)
+                argerr ("--scale-from dimensions must be nonnegative\n");
+            config_output->scale_from_w = w;
+            config_output->scale_from_h = h;
+            config_output->changes |= changes_transform;
+            auto_filter (config_output);
+            continue;
+        }
+        if (!strcmp ("--transform", argv[i])) {
+            double  transform[3][3];
+            int	    k, l;
+            if (!config_output) argerr ("%s must be used after --output\n", argv[i]);
+            if (++i >= argc) argerr ("%s requires an argument\n", argv[i-1]);
+            init_transform (&config_output->transform);
+            if (strcmp (argv[i], "none") != 0)
+            {
+                if (sscanf(argv[i], "%lf,%lf,%lf,%lf,%lf,%lf,%lf,%lf,%lf",
+                           &transform[0][0],&transform[0][1],&transform[0][2],
+                           &transform[1][0],&transform[1][1],&transform[1][2],
+                           &transform[2][0],&transform[2][1],&transform[2][2])
+                    != 9)
+                    argerr ("failed to parse '%s' as a transformation\n", argv[i]);
+                init_transform (&config_output->transform);
+                for (k = 0; k < 3; k++)
+                    for (l = 0; l < 3; l++) {
+                        config_output->transform.transform.matrix[k][l] = XDoubleToFixed (transform[k][l]);
+                    }
+            }
+            config_output->changes |= changes_transform;
+            auto_filter(config_output);
+            continue;
+        }
 	if (!strcmp ("--off", argv[i])) {
 	    if (!config_output) argerr ("%s must be used after --output\n", argv[i]);
 	    set_name_xid (&config_output->mode, None);
@@ -3802,8 +3909,8 @@ main (int argc, char **argv)
 		    if (y < 2)
 			printf ("\n\t           ");
 		}
-		if (output->transform.filter)
-		    printf ("\n\t           filter: %s", output->transform.filter);
+		if (output->filter.filter)
+		    printf ("\n\t           filter: %s", output->filter.filter);
 		printf ("\n");
 	    }
 	    if (verbose || properties)
-- 
2.8.0.rc3



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