[repo.or.cz] gfxprim.git branch master updated: 2f824b15387739be5c32dd417b6fabbf54234bc8 - Gfxprim

11 Dec 2011

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http://repo.or.cz/w/gfxprim.git/commit/2f824b15387739be5c32dd417b6fabbf54234...
commit 2f824b15387739be5c32dd417b6fabbf54234bc8
Merge: 0c88946 36a72a1
Author: BlueBear jiri.bluebear.dluhos@gmail.com
Date:   Sun Dec 11 15:03:47 2011 +0100
Merge branch 'master' of git://repo.or.cz/gfxprim
http://repo.or.cz/w/gfxprim.git/commit/0c88946ef930d04eb2c3ea3afe202ab824815...
commit 0c88946ef930d04eb2c3ea3afe202ab8248150b4
Author: BlueBear jiri.bluebear.dluhos@gmail.com
Date:   Sun Dec 11 15:03:04 2011 +0100
Added first support for arcs (currently with very strange syntax).

diff --git a/include/gfx/GP_Arc.h b/include/gfx/GP_Arc.h
new file mode 100644
index 0000000..dfec46e
--- /dev/null
+++ b/include/gfx/GP_Arc.h
@@ -0,0 +1,48 @@
+/*****************************************************************************
+ * This file is part of gfxprim library.                                     *
+ *                                                                           *
+ * Gfxprim is free software; you can redistribute it and/or                  *
+ * modify it under the terms of the GNU Lesser General Public                *
+ * License as published by the Free Software Foundation; either              *
+ * version 2.1 of the License, or (at your option) any later version.        *
+ *                                                                           *
+ * Gfxprim is distributed in the hope that it will be useful,                *
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of            *
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU         *
+ * Lesser General Public License for more details.                           *
+ *                                                                           *
+ * You should have received a copy of the GNU Lesser General Public          *
+ * License along with gfxprim; if not, write to the Free Software            *
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor,                        *
+ * Boston, MA  02110-1301  USA                                               *
+ *                                                                           *
+ * Copyright (C) 2009-2011 Jiri "BlueBear" Dluhos                            *
+ *                         jiri.bluebear.dluhos@gmail.com                  *
+ *                                                                           *
+ * Copyright (C) 2009-2011 Cyril Hrubis metan@ucw.cz                       *
+ *                                                                           *
+ *****************************************************************************/
+
+#ifndef GP_ARC_H
+#define GP_ARC_H
+
+#include "core/GP_Context.h"
+
+#define GP_QUADRANT_MINUSMINUS	1
+#define GP_QUADRANT_PLUSMINUS	2
+#define GP_QUADRANT_MINUSPLUS	4
+#define GP_QUADRANT_PLUSPLUS	8
+
+void GP_Arc(GP_Context *context, GP_Coord xcenter, GP_Coord ycenter,
+		GP_Size a, GP_Size b, int quadrant_mask,
+		int low_dx, int low_dy,
+		int high_dx, int high_dy,
+		GP_Pixel pixel);
+
+void GP_Arc_Raw(GP_Context *context, GP_Coord xcenter, GP_Coord ycenter,
+		GP_Size a, GP_Size b, int quadrant_mask,
+		int low_dx, int low_dy,
+		int high_dx, int high_dy,
+		GP_Pixel pixel);
+
+#endif /* GP_ARC_H */
diff --git a/libs/gfx/GP_Arc.c b/libs/gfx/GP_Arc.c
new file mode 100644
index 0000000..c64d94d
--- /dev/null
+++ b/libs/gfx/GP_Arc.c
@@ -0,0 +1,63 @@
+/*****************************************************************************
+ * This file is part of gfxprim library.                                     *
+ *                                                                           *
+ * Gfxprim is free software; you can redistribute it and/or                  *
+ * modify it under the terms of the GNU Lesser General Public                *
+ * License as published by the Free Software Foundation; either              *
+ * version 2.1 of the License, or (at your option) any later version.        *
+ *                                                                           *
+ * Gfxprim is distributed in the hope that it will be useful,                *
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of            *
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU         *
+ * Lesser General Public License for more details.                           *
+ *                                                                           *
+ * You should have received a copy of the GNU Lesser General Public          *
+ * License along with gfxprim; if not, write to the Free Software            *
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor,                        *
+ * Boston, MA  02110-1301  USA                                               *
+ *                                                                           *
+ * Copyright (C) 2009-2011 Jiri "BlueBear" Dluhos                            *
+ *                         jiri.bluebear.dluhos@gmail.com                  *
+ *                                                                           *
+ * Copyright (C) 2009-2011 Cyril Hrubis metan@ucw.cz                       *
+ *                                                                           *
+ *****************************************************************************/
+
+#include "GP_Gfx.h"
+#include "core/GP_FnPerBpp.h"
+
+#include "algo/Arc.algo.h"
+
+/* Generate drawing functions for various bit depths. */
+GP_DEF_DRAW_FN_PER_BPP(GP_Arc_Raw, DEF_ARC_FN)
+
+void GP_Arc_Raw(GP_Context *context, GP_Coord xcenter, GP_Coord ycenter,
+		GP_Size a, GP_Size b, int quadrant_mask,
+		int low_dx, int low_dy,
+		int high_dx, int high_dy,
+		GP_Pixel pixel)
+{
+	GP_CHECK_CONTEXT(context);
+
+	GP_FN_PER_BPP_CONTEXT(GP_Arc_Raw, context, context,
+	                      xcenter, ycenter, a, b, quadrant_mask,
+	                      low_dx, low_dy, high_dx, high_dy,
+	                      pixel);
+}
+
+void GP_Arc(GP_Context *context, GP_Coord xcenter, GP_Coord ycenter,
+		GP_Size a, GP_Size b, int quadrant_mask,
+		int low_dx, int low_dy,
+		int high_dx, int high_dy,
+		GP_Pixel pixel)
+{
+	GP_CHECK_CONTEXT(context);
+	
+	/* recalculate center point and swap a and b when axes are swapped */
+	GP_TRANSFORM_POINT(context, xcenter, ycenter);
+	GP_TRANSFORM_SWAP(context, a, b);
+	
+	GP_Arc_Raw(context, xcenter, ycenter, a, b, quadrant_mask,
+			low_dx, low_dy, high_dx, high_dy,
+			pixel);
+}
diff --git a/libs/gfx/algo/Arc.algo.h b/libs/gfx/algo/Arc.algo.h
new file mode 100644
index 0000000..1681ce8
--- /dev/null
+++ b/libs/gfx/algo/Arc.algo.h
@@ -0,0 +1,84 @@
+/*****************************************************************************
+ * This file is part of gfxprim library.                                     *
+ *                                                                           *
+ * Gfxprim is free software; you can redistribute it and/or                  *
+ * modify it under the terms of the GNU Lesser General Public                *
+ * License as published by the Free Software Foundation; either              *
+ * version 2.1 of the License, or (at your option) any later version.        *
+ *                                                                           *
+ * Gfxprim is distributed in the hope that it will be useful,                *
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of            *
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU         *
+ * Lesser General Public License for more details.                           *
+ *                                                                           *
+ * You should have received a copy of the GNU Lesser General Public          *
+ * License along with gfxprim; if not, write to the Free Software            *
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor,                        *
+ * Boston, MA  02110-1301  USA                                               *
+ *                                                                           *
+ * Copyright (C) 2009-2010 Jiri "BlueBear" Dluhos                            *
+ *                         jiri.bluebear.dluhos@gmail.com                  *
+ *                                                                           *
+ * Copyright (C) 2009-2010 Cyril Hrubis metan@ucw.cz                       *
+ *                                                                           *
+ *****************************************************************************/
+
+/*
+ * The elliptical arc algorithm; a generalization of an ellipse that allows
+ * to draw only part of it. The math is exactly the same, only it has
+ * additional tests of what part to draw.
+ */
+
+/*
+ * This macro defines an elliptic arc drawing function.
+ * Arguments:
+ *     CONTEXT_T - user-defined type of drawing context (passed to PUTPIXEL)
+ *     PIXVAL_T  - user-defined pixel value type (passed to PUTPIXEL)
+ *     PUTPIXEL  - a pixel drawing function f(context, x, y, pixval)
+ *     FN_NAME   - name of the function to be defined
+ */
+#define DEF_ARC_FN(FN_NAME, CONTEXT_T, PIXVAL_T, PUTPIXEL) +void FN_NAME(CONTEXT_T context, int xcenter, int ycenter, +	unsigned int a, unsigned int b, int quadrant_mask, +	int low_dx, int low_dy, int high_dx, int high_dy, +	PIXVAL_T pixval) +{ +	/* Precompute quadratic terms. */ +	int a2 = a*a; +	int b2 = b*b; ++	int x, y, error; +	for (x = 0, error = -b2*a, y = b; y >= 0; y--) { +		while (error < 0) { ++			/* Calculate error(x+1) from error(x). */ +			error += 2*x*b2 + b2; +			x++; ++			if ((x*low_dy >= y*low_dx) && (x*high_dy <= y*high_dx)) { +				if (quadrant_mask & GP_QUADRANT_MINUSMINUS) +					PUTPIXEL(context, xcenter-x+1, ycenter-y, pixval); +				if (quadrant_mask & GP_QUADRANT_PLUSMINUS) +					PUTPIXEL(context, xcenter+x-1, ycenter-y, pixval); +				if (quadrant_mask & GP_QUADRANT_MINUSPLUS) +					PUTPIXEL(context, xcenter-x+1, ycenter+y, pixval); +				if (quadrant_mask & GP_QUADRANT_PLUSPLUS) +					PUTPIXEL(context, xcenter+x-1, ycenter+y, pixval); +			} +		} ++		/*
  Calculate error(y-1) from error(y). */ +		error += -2*y*a2 + a2; ++		if ((x*low_dy >= y*low_dx) && (x*high_dy <= y*high_dx)) { +			if (quadrant_mask & GP_QUADRANT_MINUSMINUS) +				PUTPIXEL(context, xcenter-x+1, ycenter-y, pixval); +			if (quadrant_mask & GP_QUADRANT_PLUSMINUS) +				PUTPIXEL(context, xcenter+x-1, ycenter-y, pixval); +			if (quadrant_mask & GP_QUADRANT_MINUSPLUS) +				PUTPIXEL(context, xcenter-x+1, ycenter+y, pixval); +			if (quadrant_mask & GP_QUADRANT_PLUSPLUS) +				PUTPIXEL(context, xcenter+x-1, ycenter+y, pixval); +		} +	} +}
-----------------------------------------------------------------------
Summary of changes:
 include/gfx/{GP_Line.h => GP_Arc.h}          |   25 ++++++---
 libs/gfx/{GP_Line.c => GP_Arc.c}             |   33 ++++++++----
 libs/gfx/algo/{Ellipse.algo.h => Arc.algo.h} |   76 ++++++++++----------------
 3 files changed, 68 insertions(+), 66 deletions(-)
 copy include/gfx/{GP_Line.h => GP_Arc.h} (77%)
 copy libs/gfx/{GP_Line.c => GP_Arc.c} (68%)
 copy libs/gfx/algo/{Ellipse.algo.h => Arc.algo.h} (59%)
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