[cairo-commit] 4 commits - src/cairo-tor-scan-converter.c test/reference test/simple.c

[Chris Wilson]

 dev/null                                                       |binary
 src/cairo-tor-scan-converter.c                                 |   94 +++++++---
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 test/simple.c                                                  |    8 
 279 files changed, 70 insertions(+), 32 deletions(-)

New commits:
commit 7aacd81befc5ad1aec26bcf7e65fa5bd36c6a9b4
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Thu Oct 2 08:17:14 2014 +0100

    test: Refresh reference images for tor rendering changes
    
    (And include a git add missed from commit
    
    ccd48b346436a80629e4f9a07f2ba7ffbfd802f1
    Author: Chris Wilson <chris at chris-wilson.co.uk>
    Date:   Tue Sep 30 14:06:21 2014 +0100
    
        test: Remove more duplicated reference images
    
    but were mostly invalidated by the rasteriser changes anyway).
    
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

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commit 950f1e7103a3b4f3405fbb3ee2844ed24b902834
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Thu Oct 2 07:52:05 2014 +0100

    tor: Enable analytic processing for starting rows
    
    If all the edges start at the very beginning of the whole row, we can
    merge them and include check for intersections/endings during the row.
    This allows us to enable fast analytic processing for even the very
    first row on pixel aligned vertices.
    
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

diff --git a/src/cairo-tor-scan-converter.c b/src/cairo-tor-scan-converter.c
index d1aff25..4adcafb 100644
--- a/src/cairo-tor-scan-converter.c
+++ b/src/cairo-tor-scan-converter.c
@@ -1167,8 +1167,8 @@ can_do_full_row (struct active_list *active)
 
 	if (e->dy) {
 	    struct quorem x = e->x;
-	    x.quo += e->dxdy_full.quo;
-	    x.rem += e->dxdy_full.rem;
+	    x.quo += e->dxdy_full.quo - e->dxdy.quo/2;
+	    x.rem += e->dxdy_full.rem - e->dxdy.rem/2;
 	    if (x.rem < 0) {
 		x.quo--;
 		x.rem += e->dy;
@@ -1198,7 +1198,7 @@ active_list_merge_edges_from_bucket(struct active_list *active,
     active->head.next = merge_unsorted_edges (active->head.next, edges);
 }
 
-inline static void
+inline static int
 polygon_fill_buckets (struct active_list *active,
 		      struct edge *edge,
 		      int y,
@@ -1206,6 +1206,7 @@ polygon_fill_buckets (struct active_list *active,
 {
     grid_scaled_y_t min_height = active->min_height;
     int is_vertical = active->is_vertical;
+    int max_suby = 0;
 
     while (edge) {
 	struct edge *next = edge->next;
@@ -1219,10 +1220,14 @@ polygon_fill_buckets (struct active_list *active,
 	    min_height = edge->height_left;
 	is_vertical &= edge->dy == 0;
 	edge = next;
+	if (suby > max_suby)
+		max_suby = suby;
     }
 
     active->is_vertical = is_vertical;
     active->min_height = min_height;
+
+    return max_suby;
 }
 
 static void step (struct edge *edge)
@@ -1729,7 +1734,15 @@ glitter_scan_converter_render(glitter_scan_converter_t *converter,
 
 	/* Determine if we can ignore this row or use the full pixel
 	 * stepper. */
-	if (! polygon->y_buckets[i]) {
+	if (polygon_fill_buckets (active,
+				  polygon->y_buckets[i],
+				  (i+ymin_i)*GRID_Y,
+				  buckets) == 0) {
+	    if (buckets[0]) {
+		active_list_merge_edges_from_bucket (active, buckets[0]);
+		buckets[0] = NULL;
+	    }
+
 	    if (active->head.next == &active->tail) {
 		active->min_height = INT_MAX;
 		active->is_vertical = 1;
@@ -1759,18 +1772,12 @@ glitter_scan_converter_render(glitter_scan_converter_t *converter,
 	} else {
 	    int sub;
 
-	    polygon_fill_buckets (active,
-				  polygon->y_buckets[i],
-				  (i+ymin_i)*GRID_Y,
-				  buckets);
-
 	    /* Subsample this row. */
 	    for (sub = 0; sub < GRID_Y; sub++) {
 		if (buckets[sub]) {
 		    active_list_merge_edges_from_bucket (active, buckets[sub]);
 		    buckets[sub] = NULL;
 		}
-
 		sub_row (active, coverages, winding_mask);
 	    }
 	}
commit 1a32ce83e4c1f3ca22a3f137b0126003a0e3d6e7
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Wed Oct 1 12:59:29 2014 +0100

    tor: Perform analytic coverage over the pixel not sample points
    
    We use two different methods within tor to compute the coverage.
    The first is that we iterate over every sample point within the pixel
    and see if it is covered. The second is that we look at a whole pixel
    and analytically compute the coverage inside (if we have no
    intersections within that row).
    
    One side effect of
    
    commit 03c3d4b7c159a3004071522bac2461e553fec211
    Author: Chris Wilson <chris at chris-wilson.co.uk>
    Date:   Tue Sep 30 08:44:43 2014 +0100
    
        tor: Fix loss of precision from projection onto sample grid
    
    was to compute our X coordinates for the sample locations (offset by
    half a subrow) and that in order to compute the analytical pixel
    coverage correctly, we therefore need to backstep by half the subrow to
    the pixel boundary.
    
    References: https://bugs.freedesktop.org/show_bug.cgi?id=84396
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

diff --git a/src/cairo-tor-scan-converter.c b/src/cairo-tor-scan-converter.c
index 1c89798..d1aff25 100644
--- a/src/cairo-tor-scan-converter.c
+++ b/src/cairo-tor-scan-converter.c
@@ -761,7 +761,6 @@ inline static void full_step (struct edge *e)
 	++e->x.quo;
 	e->x.rem -= e->dy;
     }
-    assert (e->x.rem >= 0 && e->x.rem < e->dy);
 
     e->cell = e->x.quo + (e->x.rem >= e->dy/2);
 }
@@ -789,12 +788,41 @@ cell_list_render_edge(struct cell_list *cells,
 		      struct edge *edge,
 		      int sign)
 {
+    struct quorem x1, x2;
     grid_scaled_x_t fx1, fx2;
     int ix1, ix2;
 
-    GRID_X_TO_INT_FRAC(edge->cell, ix1, fx1);
+    x1 = edge->x;
     full_step (edge);
-    GRID_X_TO_INT_FRAC(edge->cell, ix2, fx2);
+    x2 = edge->x;
+
+    /* Step back from the sample location (half-subrow) to the pixel origin */
+    if (edge->dy) {
+	x1.quo -= edge->dxdy.quo / 2;
+	x1.rem -= edge->dxdy.rem / 2;
+	if (x1.rem < 0) {
+	    --x1.quo;
+	    x1.rem += edge->dy;
+	} else if (x1.rem >= edge->dy) {
+	    ++x1.quo;
+	    x1.rem -= edge->dy;
+	}
+
+	x2.quo -= edge->dxdy.quo / 2;
+	x2.rem -= edge->dxdy.rem / 2;
+	if (x2.rem < 0) {
+	    --x2.quo;
+	    x2.rem += edge->dy;
+	} else if (x2.rem >= edge->dy) {
+	    ++x2.quo;
+	    x2.rem -= edge->dy;
+	}
+    }
+
+    GRID_X_TO_INT_FRAC(x1.quo, ix1, fx1);
+    GRID_X_TO_INT_FRAC(x2.quo, ix2, fx2);
+
+    cell_list_maybe_rewind(cells, MIN(ix1, ix2));
 
     /* Edge is entirely within a column? */
     if (ix1 == ix2) {
@@ -808,6 +836,7 @@ cell_list_render_edge(struct cell_list *cells,
 
     /* Orient the edge left-to-right. */
     if (ix2 < ix1) {
+	struct quorem tx;
 	int t;
 
 	t = ix1;
@@ -817,6 +846,10 @@ cell_list_render_edge(struct cell_list *cells,
 	t = fx1;
 	fx1 = fx2;
 	fx2 = t;
+
+	tx = x1;
+	x1 = x2;
+	x2 = tx;
     }
 
     /* Add coverage for all pixels [ix1,ix2] on this row crossed
@@ -824,14 +857,17 @@ cell_list_render_edge(struct cell_list *cells,
     {
 	struct cell_pair pair;
 	struct quorem y;
-	int32_t dx;
+	int64_t tmp, dx;
 	int y_last;
 
-	dx = (ix2 - ix1) * GRID_X + (fx2 - fx1);
-	assert (dx > 0);
+	dx = (x2.quo - x1.quo) * edge->dy + (x2.rem - x1.rem);
 
-	y.quo = (GRID_X - fx1) * GRID_Y / dx;
-	y.rem = (GRID_X - fx1) * GRID_Y % dx;
+	tmp = (ix1 + 1) * GRID_X * edge->dy;
+	tmp -= x1.quo * edge->dy + x1.rem;
+	tmp *= GRID_Y;
+
+	y.quo = tmp / dx;
+	y.rem = tmp % dx;
 
 	/* When rendering a previous edge on the active list we may
 	 * advance the cell list cursor past the leftmost pixel of the
@@ -847,11 +883,7 @@ cell_list_render_edge(struct cell_list *cells,
 	 *
 	 * The left edge touches cells past the starting cell of the
 	 * right edge.  Fortunately such cases are rare.
-	 *
-	 * The rewinding is never necessary if the current edge stays
-	 * within a single column because we've checked before calling
-	 * this function that the active list order won't change. */
-	cell_list_maybe_rewind(cells, ix1);
+	 */
 
 	pair = cell_list_find_pair(cells, ix1, ix1+1);
 	pair.cell1->uncovered_area += sign*y.quo*(GRID_X + fx1);
@@ -862,8 +894,8 @@ cell_list_render_edge(struct cell_list *cells,
 	    struct cell *cell = pair.cell2;
 	    struct quorem dydx_full;
 
-	    dydx_full.quo = GRID_Y * GRID_X / dx;
-	    dydx_full.rem = GRID_Y * GRID_X % dx;
+	    dydx_full.quo = GRID_Y * GRID_X * edge->dy / dx;
+	    dydx_full.rem = GRID_Y * GRID_X * edge->dy % dx;
 
 	    ++ix1;
 	    do {
@@ -1207,7 +1239,6 @@ static void step (struct edge *edge)
 	++edge->x.quo;
 	edge->x.rem -= edge->dy;
     }
-    assert (edge->x.rem >= 0 && edge->x.rem < edge->dy);
 
     edge->cell = edge->x.quo + (edge->x.rem >= edge->dy/2);
 }
@@ -1453,7 +1484,8 @@ polygon_add_edge (struct polygon *polygon,
 
     if (p2->x == p1->x) {
 	e->cell = p1->x;
-	e->x.quo = e->x.rem = 0;
+	e->x.quo = p1->x;
+	e->x.rem = 0;
 	e->dxdy.quo = e->dxdy.rem = 0;
 	e->dxdy_full.quo = e->dxdy_full.rem = 0;
 	e->dy = 0;
@@ -1487,7 +1519,6 @@ polygon_add_edge (struct polygon *polygon,
 		e->x.quo++;
 		e->x.rem -= Ey;
 	}
-	assert (e->x.rem >= 0 && e->x.rem < Ey);
 
 	if (e->height_left >= GRID_Y) {
 	    tmp = Ex * (2 * GRID_Y << GLITTER_INPUT_BITS);
commit 79c8b14b9fd8716d47fab4436b34d26b0135e9d7
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Thu Oct 2 00:20:52 2014 +0100

    test/simple: Tighten sanity checks in reference image generator
    
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

diff --git a/test/simple.c b/test/simple.c
index 674a0de..7ec8a9a 100644
--- a/test/simple.c
+++ b/test/simple.c
@@ -54,8 +54,6 @@ static int pfrac (int v)
     return v & ((1 << CAIRO_FIXED_FRAC_BITS) - 1);
 }
 
-#define BIAS 1024
-
 static void add_edge (struct coverage *coverage,
 		      int x1, int y1, int x2, int y2,
 		      int sign)
@@ -98,9 +96,11 @@ static void add_edge (struct coverage *coverage,
 	int x = xq + (xr >= dy/2);
 
 	if (x < 256*coverage->width) {
-		int i = pfloor (y) * coverage->width + pfloor (x);
-		if (x > 0)
+		int i = pfloor (y) * coverage->width;
+		if (x > 0) {
+			i += pfloor (x);
 			coverage->cells[i].uncovered_area += sign * pfrac(x);
+		}
 		coverage->cells[i].covered_height += sign;
 	}