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/*
* Copyright © 2000 SuSE, Inc.
* Copyright © 2007 Red Hat, Inc.
*
* 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 SuSE not be used in advertising or
* publicity pertaining to distribution of the software without specific,
* written prior permission. SuSE makes no representations about the
* suitability of this software for any purpose. It is provided "as is"
* without express or implied warranty.
*
* SuSE DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL SuSE
* 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.
*/
#include <config.h>
#include <stdlib.h>
#include "pixman-private.h"
static source_pict_class_t
linear_gradient_classify (pixman_image_t *image,
int x,
int y,
int width,
int height)
{
linear_gradient_t *linear = (linear_gradient_t *)image;
pixman_vector_t v;
pixman_fixed_32_32_t l;
pixman_fixed_48_16_t dx, dy, a, b, off;
pixman_fixed_48_16_t factors[4];
int i;
image->source.class = SOURCE_IMAGE_CLASS_UNKNOWN;
dx = linear->p2.x - linear->p1.x;
dy = linear->p2.y - linear->p1.y;
l = dx * dx + dy * dy;
if (l)
{
a = (dx << 32) / l;
b = (dy << 32) / l;
}
else
{
a = b = 0;
}
off = (-a * linear->p1.x
-b * linear->p1.y) >> 16;
for (i = 0; i < 3; i++)
{
v.vector[0] = pixman_int_to_fixed ((i % 2) * (width - 1) + x);
v.vector[1] = pixman_int_to_fixed ((i / 2) * (height - 1) + y);
v.vector[2] = pixman_fixed_1;
if (image->common.transform)
{
if (!pixman_transform_point_3d (image->common.transform, &v))
{
image->source.class = SOURCE_IMAGE_CLASS_UNKNOWN;
return image->source.class;
}
}
factors[i] = ((a * v.vector[0] + b * v.vector[1]) >> 16) + off;
}
if (factors[2] == factors[0])
image->source.class = SOURCE_IMAGE_CLASS_HORIZONTAL;
else if (factors[1] == factors[0])
image->source.class = SOURCE_IMAGE_CLASS_VERTICAL;
return image->source.class;
}
static void
linear_gradient_property_changed (pixman_image_t *image)
{
image->common.get_scanline_32 = (scanFetchProc)pixmanFetchSourcePict;
image->common.get_scanline_64 = (scanFetchProc)_pixman_image_get_scanline_64_generic;
}
PIXMAN_EXPORT pixman_image_t *
pixman_image_create_linear_gradient (pixman_point_fixed_t *p1,
pixman_point_fixed_t *p2,
const pixman_gradient_stop_t *stops,
int n_stops)
{
pixman_image_t *image;
linear_gradient_t *linear;
return_val_if_fail (n_stops >= 2, NULL);
image = _pixman_image_allocate();
if (!image)
return NULL;
linear = &image->linear;
if (!_pixman_init_gradient (&linear->common, stops, n_stops))
{
free (image);
return NULL;
}
linear->p1 = *p1;
linear->p2 = *p2;
image->type = LINEAR;
image->source.class = SOURCE_IMAGE_CLASS_UNKNOWN;
image->common.classify = linear_gradient_classify;
image->common.property_changed = linear_gradient_property_changed;
linear_gradient_property_changed (image);
return image;
}
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