From 167561f2823767058e2be3a26131b5f820b35c35 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Tue, 30 Sep 2014 10:22:41 +0100 Subject: tor: Review full-row walker When updating the quorem between cells, we would lose the overflow increment as it was only applied locally and not preserved by updating the quorem. 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test/reference/surface-pattern-operator.rgb24.ref.png create mode 100644 test/reference/trap-clip.argb32.ref.png delete mode 100644 test/reference/trap-clip.ref.png create mode 100644 test/reference/trap-clip.rgb24.ref.png delete mode 100644 test/reference/unbounded-operator.ref.png create mode 100644 test/reference/unbounded-operator.rgb24.ref.png diff --git a/src/cairo-tor-scan-converter.c b/src/cairo-tor-scan-converter.c index 46473e9a9..1c8979844 100644 --- a/src/cairo-tor-scan-converter.c +++ b/src/cairo-tor-scan-converter.c @@ -458,21 +458,6 @@ struct glitter_scan_converter { grid_scaled_y_t ymin, ymax; }; -/* Compute the floored division a/b. Assumes / and % perform symmetric - * division. */ -inline static struct quorem -floored_divrem(int a, int b) -{ - struct quorem qr; - qr.quo = a/b; - qr.rem = a%b; - if ((a^b)<0 && qr.rem) { - qr.quo -= 1; - qr.rem += b; - } - return qr; -} - static struct _pool_chunk * _pool_chunk_init( struct _pool_chunk *p, @@ -804,21 +789,12 @@ cell_list_render_edge(struct cell_list *cells, struct edge *edge, int sign) { - grid_scaled_y_t y1, y2, dy; - grid_scaled_x_t dx; - int ix1, ix2; grid_scaled_x_t fx1, fx2; + int ix1, ix2; - int x1, x2; - - /* XXX review for loss of precision from dropping x.rem in our stepper */ - - x1 = edge->cell; + GRID_X_TO_INT_FRAC(edge->cell, ix1, fx1); full_step (edge); - x2 = edge->cell; - - GRID_X_TO_INT_FRAC(x1, ix1, fx1); - GRID_X_TO_INT_FRAC(x2, ix2, fx2); + GRID_X_TO_INT_FRAC(edge->cell, ix2, fx2); /* Edge is entirely within a column? */ if (ix1 == ix2) { @@ -831,26 +807,31 @@ cell_list_render_edge(struct cell_list *cells, } /* Orient the edge left-to-right. */ - dx = x2 - x1; - if (dx >= 0) { - y1 = 0; - y2 = GRID_Y; - } else { - int tmp; - tmp = ix1; ix1 = ix2; ix2 = tmp; - tmp = fx1; fx1 = fx2; fx2 = tmp; - dx = -dx; - sign = -sign; - y1 = GRID_Y; - y2 = 0; + if (ix2 < ix1) { + int t; + + t = ix1; + ix1 = ix2; + ix2 = t; + + t = fx1; + fx1 = fx2; + fx2 = t; } - dy = y2 - y1; /* Add coverage for all pixels [ix1,ix2] on this row crossed * by the edge. */ { struct cell_pair pair; - struct quorem y = floored_divrem((GRID_X - fx1)*dy, dx); + struct quorem y; + int32_t dx; + int y_last; + + dx = (ix2 - ix1) * GRID_X + (fx2 - fx1); + assert (dx > 0); + + y.quo = (GRID_X - fx1) * GRID_Y / dx; + y.rem = (GRID_X - fx1) * GRID_Y % dx; /* When rendering a previous edge on the active list we may * advance the cell list cursor past the leftmost pixel of the @@ -875,26 +856,27 @@ cell_list_render_edge(struct cell_list *cells, pair = cell_list_find_pair(cells, ix1, ix1+1); pair.cell1->uncovered_area += sign*y.quo*(GRID_X + fx1); pair.cell1->covered_height += sign*y.quo; - y.quo += y1; + y_last = y.quo; if (ix1+1 < ix2) { - struct quorem dydx_full = floored_divrem(GRID_X*dy, dx); 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; ++ix1; do { - grid_scaled_y_t y_skip = dydx_full.quo; + y.quo += dydx_full.quo; y.rem += dydx_full.rem; if (y.rem >= dx) { - ++y_skip; + y.quo++; y.rem -= dx; } - y.quo += y_skip; - - y_skip *= sign; - cell->uncovered_area += y_skip*GRID_X; - cell->covered_height += y_skip; + cell->uncovered_area += sign*(y.quo - y_last)*GRID_X; + cell->covered_height += sign*(y.quo - y_last); + y_last = y.quo; ++ix1; cell = cell_list_find(cells, ix1); @@ -902,8 +884,8 @@ cell_list_render_edge(struct cell_list *cells, pair.cell2 = cell; } - pair.cell2->uncovered_area += sign*(y2 - y.quo)*fx2; - pair.cell2->covered_height += sign*(y2 - y.quo); + pair.cell2->uncovered_area += sign*(GRID_Y - y_last)*fx2; + pair.cell2->covered_height += sign*(GRID_Y - y_last); } } diff --git a/test/reference/aliasing.argb32.ref.png b/test/reference/aliasing.argb32.ref.png index 4d3c30371..19659c663 100644 Binary files a/test/reference/aliasing.argb32.ref.png and b/test/reference/aliasing.argb32.ref.png differ diff --git a/test/reference/aliasing.rgb24.ref.png b/test/reference/aliasing.rgb24.ref.png index 4d3c30371..19659c663 100644 Binary files a/test/reference/aliasing.rgb24.ref.png and b/test/reference/aliasing.rgb24.ref.png differ diff --git a/test/reference/arc-direction.argb32.ref.png b/test/reference/arc-direction.argb32.ref.png index fa90b89de..a1c8d74bc 100644 Binary files a/test/reference/arc-direction.argb32.ref.png and b/test/reference/arc-direction.argb32.ref.png differ diff --git a/test/reference/arc-direction.rgb24.ref.png b/test/reference/arc-direction.rgb24.ref.png index fa90b89de..a1c8d74bc 100644 Binary files a/test/reference/arc-direction.rgb24.ref.png and b/test/reference/arc-direction.rgb24.ref.png differ diff 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