pixman-1.0

git-svn-id: svn://kolibrios.org@1891 a494cfbc-eb01-0410-851d-a64ba20cac60
2011-02-27 17:46:46 +00:00
parent acec52c402
commit 4dd0483a93
38 changed files with 27477 additions and 0 deletions
@@ -0,0 +1,198 @@
+/*
+ * Copyright © 2000 SuSE, Inc.
+ * Copyright © 2007 Red Hat, Inc.
+ * Copyright © 2000 Keith Packard, member of The XFree86 Project, Inc.
+ *             2005 Lars Knoll & Zack Rusin, Trolltech
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and its
+ * documentation for any purpose is hereby granted without fee, provided that
+ * the above copyright notice appear in all copies and that both that
+ * copyright notice and this permission notice appear in supporting
+ * documentation, and that the name of Keith Packard not be used in
+ * advertising or publicity pertaining to distribution of the software without
+ * specific, written prior permission.  Keith Packard makes no
+ * representations about the suitability of this software for any purpose.  It
+ * is provided "as is" without express or implied warranty.
+ *
+ * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
+ * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
+ * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
+ * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
+ * SOFTWARE.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdlib.h>
+#include <math.h>
+#include "pixman-private.h"
+
+static force_inline double
+coordinates_to_parameter (double x, double y, double angle)
+{
+    double t;
+
+    t = atan2 (y, x) + angle;
+
+    while (t < 0)
+	t += 2 * M_PI;
+
+    while (t >= 2 * M_PI)
+	t -= 2 * M_PI;
+
+    return 1 - t * (1 / (2 * M_PI)); /* Scale t to [0, 1] and
+				      * make rotation CCW
+				      */
+}
+
+static void
+conical_gradient_get_scanline_32 (pixman_image_t *image,
+                                  int             x,
+                                  int             y,
+                                  int             width,
+                                  uint32_t *      buffer,
+                                  const uint32_t *mask)
+{
+    source_image_t *source = (source_image_t *)image;
+    gradient_t *gradient = (gradient_t *)source;
+    conical_gradient_t *conical = (conical_gradient_t *)image;
+    uint32_t       *end = buffer + width;
+    pixman_gradient_walker_t walker;
+    pixman_bool_t affine = TRUE;
+    double cx = 1.;
+    double cy = 0.;
+    double cz = 0.;
+    double rx = x + 0.5;
+    double ry = y + 0.5;
+    double rz = 1.;
+
+    _pixman_gradient_walker_init (&walker, gradient, source->common.repeat);
+
+    if (source->common.transform)
+    {
+	pixman_vector_t v;
+
+	/* reference point is the center of the pixel */
+	v.vector[0] = pixman_int_to_fixed (x) + pixman_fixed_1 / 2;
+	v.vector[1] = pixman_int_to_fixed (y) + pixman_fixed_1 / 2;
+	v.vector[2] = pixman_fixed_1;
+
+	if (!pixman_transform_point_3d (source->common.transform, &v))
+	    return;
+
+	cx = source->common.transform->matrix[0][0] / 65536.;
+	cy = source->common.transform->matrix[1][0] / 65536.;
+	cz = source->common.transform->matrix[2][0] / 65536.;
+
+	rx = v.vector[0] / 65536.;
+	ry = v.vector[1] / 65536.;
+	rz = v.vector[2] / 65536.;
+
+	affine =
+	    source->common.transform->matrix[2][0] == 0 &&
+	    v.vector[2] == pixman_fixed_1;
+    }
+
+    if (affine)
+    {
+	rx -= conical->center.x / 65536.;
+	ry -= conical->center.y / 65536.;
+
+	while (buffer < end)
+	{
+	    if (!mask || *mask++)
+	    {
+		double t = coordinates_to_parameter (rx, ry, conical->angle);
+
+		*buffer = _pixman_gradient_walker_pixel (
+		    &walker, (pixman_fixed_48_16_t)pixman_double_to_fixed (t));
+	    }
+
+	    ++buffer;
+
+	    rx += cx;
+	    ry += cy;
+	}
+    }
+    else
+    {
+	while (buffer < end)
+	{
+	    double x, y;
+
+	    if (!mask || *mask++)
+	    {
+		double t;
+
+		if (rz != 0)
+		{
+		    x = rx / rz;
+		    y = ry / rz;
+		}
+		else
+		{
+		    x = y = 0.;
+		}
+
+		x -= conical->center.x / 65536.;
+		y -= conical->center.y / 65536.;
+
+		t = coordinates_to_parameter (x, y, conical->angle);
+
+		*buffer = _pixman_gradient_walker_pixel (
+		    &walker, (pixman_fixed_48_16_t)pixman_double_to_fixed (t));
+	    }
+
+	    ++buffer;
+
+	    rx += cx;
+	    ry += cy;
+	    rz += cz;
+	}
+    }
+}
+
+static void
+conical_gradient_property_changed (pixman_image_t *image)
+{
+    image->common.get_scanline_32 = conical_gradient_get_scanline_32;
+    image->common.get_scanline_64 = _pixman_image_get_scanline_generic_64;
+}
+
+PIXMAN_EXPORT pixman_image_t *
+pixman_image_create_conical_gradient (pixman_point_fixed_t *        center,
+                                      pixman_fixed_t                angle,
+                                      const pixman_gradient_stop_t *stops,
+                                      int                           n_stops)
+{
+    pixman_image_t *image = _pixman_image_allocate ();
+    conical_gradient_t *conical;
+
+    if (!image)
+	return NULL;
+
+    conical = &image->conical;
+
+    if (!_pixman_init_gradient (&conical->common, stops, n_stops))
+    {
+	free (image);
+	return NULL;
+    }
+
+    angle = MOD (angle, pixman_int_to_fixed (360));
+
+    image->type = CONICAL;
+
+    conical->center = *center;
+    conical->angle = (pixman_fixed_to_double (angle) / 180.0) * M_PI;
+
+    image->common.property_changed = conical_gradient_property_changed;
+
+    return image;
+}
+