intel-2D: move to sdk/sources

git-svn-id: svn://kolibrios.org@4359 a494cfbc-eb01-0410-851d-a64ba20cac60

contrib/sdk/sources/Intel-2D/sna/sna_transform.c

@@ -0,0 +1,147 @@
+/*
+ * Copyright 1998-1999 Precision Insight, Inc., Cedar Park, Texas.  All Rights Reserved.
+ * Copyright (c) 2005 Jesse Barnes <jbarnes@virtuousgeek.org>
+ * Copyright © 2010 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * Authors:
+ *    Jesse Barns <jbarnes@virtuousgeek.org>
+ *    Chris Wilson <chris@chris-wilson.co.uk>
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "sna.h"
+
+#define pixman_fixed_e			((pixman_fixed_t) 1)
+#define pixman_fixed_1			(pixman_int_to_fixed(1))
+#define pixman_fixed_1_minus_e		(pixman_fixed_1 - pixman_fixed_e)
+#define pixman_fixed_to_int(f)		((int) ((f) >> 16))
+#define pixman_int_to_fixed(i)		((pixman_fixed_t) ((i) << 16))
+#define pixman_fixed_fraction(f)	((f) & pixman_fixed_1_minus_e)
+
+#define IntToxFixed(i)	pixman_int_to_fixed(i)
+
+/**
+ * Returns whether the provided transform is affine.
+ *
+ * transform may be null.
+ */
+bool sna_transform_is_affine(const PictTransform *t)
+{
+	if (t == NULL)
+		return true;
+
+	return t->matrix[2][0] == 0 && t->matrix[2][1] == 0;
+}
+
+bool
+sna_transform_is_translation(const PictTransform *t,
+			     pixman_fixed_t *tx,
+			     pixman_fixed_t *ty)
+{
+	if (t == NULL) {
+		*tx = *ty = 0;
+		return true;
+	}
+
+	if (t->matrix[0][0] != IntToxFixed(1) ||
+	    t->matrix[0][1] != 0 ||
+	    t->matrix[1][0] != 0 ||
+	    t->matrix[1][1] != IntToxFixed(1) ||
+	    t->matrix[2][0] != 0 ||
+	    t->matrix[2][1] != 0 ||
+	    t->matrix[2][2] != IntToxFixed(1))
+		return false;
+
+	*tx = t->matrix[0][2];
+	*ty = t->matrix[1][2];
+	return true;
+}
+
+bool
+sna_transform_is_integer_translation(const PictTransform *t, int16_t *tx, int16_t *ty)
+{
+	if (t == NULL) {
+		*tx = *ty = 0;
+		return true;
+	}
+
+	if (t->matrix[0][0] != IntToxFixed(1) ||
+	    t->matrix[0][1] != 0 ||
+	    t->matrix[1][0] != 0 ||
+	    t->matrix[1][1] != IntToxFixed(1) ||
+	    t->matrix[2][0] != 0 ||
+	    t->matrix[2][1] != 0 ||
+	    t->matrix[2][2] != IntToxFixed(1))
+		return false;
+
+	if (pixman_fixed_fraction(t->matrix[0][2]) ||
+	    pixman_fixed_fraction(t->matrix[1][2]))
+		return false;
+
+	*tx = pixman_fixed_to_int(t->matrix[0][2]);
+	*ty = pixman_fixed_to_int(t->matrix[1][2]);
+	return true;
+}
+
+/**
+ * Returns the floating-point coordinates transformed by the given transform.
+ */
+void
+sna_get_transformed_coordinates(int x, int y,
+			       	const PictTransform *transform,
+				float *x_out, float *y_out)
+{
+	if (transform == NULL) {
+		*x_out = x;
+		*y_out = y;
+	} else
+		_sna_get_transformed_coordinates(x, y, transform, x_out, y_out);
+}
+
+/**
+ * Returns the un-normalized floating-point coordinates transformed by the given transform.
+ */
+void
+sna_get_transformed_coordinates_3d(int x, int y,
+				   const PictTransform *transform,
+				   float *x_out, float *y_out, float *w_out)
+{
+	if (transform == NULL) {
+		*x_out = x;
+		*y_out = y;
+		*w_out = 1;
+	} else {
+		int64_t result[3];
+
+		if (_sna_transform_point(transform, x, y, result)) {
+			*x_out = result[0] / 65536.;
+			*y_out = result[1] / 65536.;
+			*w_out = result[2] / 65536.;
+		} else {
+			*x_out = *y_out = 0;
+			*w_out = 1.;
+		}
+	}
+}