263 lines
7.1 KiB
C
263 lines
7.1 KiB
C
/* -*- Mode: c; c-basic-offset: 4; tab-width: 8; indent-tabs-mode: t; -*- */
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/*
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* Copyright © 2000 SuSE, Inc.
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* Copyright © 2007 Red Hat, Inc.
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* Copyright © 2000 Keith Packard, member of The XFree86 Project, Inc.
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* 2005 Lars Knoll & Zack Rusin, Trolltech
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*
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that
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* copyright notice and this permission notice appear in supporting
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* documentation, and that the name of Keith Packard not be used in
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* advertising or publicity pertaining to distribution of the software without
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* specific, written prior permission. Keith Packard makes no
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* representations about the suitability of this software for any purpose. It
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* is provided "as is" without express or implied warranty.
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*
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* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
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* SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
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* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
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* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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* SOFTWARE.
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <stdlib.h>
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#include "pixman-private.h"
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static source_image_class_t
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linear_gradient_classify (pixman_image_t *image,
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int x,
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int y,
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int width,
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int height)
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{
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source_image_t *source = (source_image_t *)image;
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linear_gradient_t *linear = (linear_gradient_t *)image;
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pixman_vector_t v;
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pixman_fixed_32_32_t l;
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pixman_fixed_48_16_t dx, dy;
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double inc;
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source_image_class_t class;
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class = SOURCE_IMAGE_CLASS_UNKNOWN;
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if (source->common.transform)
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{
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/* projective transformation */
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if (source->common.transform->matrix[2][0] != 0 ||
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source->common.transform->matrix[2][1] != 0 ||
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source->common.transform->matrix[2][2] == 0)
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{
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return class;
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}
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v.vector[0] = source->common.transform->matrix[0][1];
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v.vector[1] = source->common.transform->matrix[1][1];
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v.vector[2] = source->common.transform->matrix[2][2];
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}
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else
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{
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v.vector[0] = 0;
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v.vector[1] = pixman_fixed_1;
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v.vector[2] = pixman_fixed_1;
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}
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dx = linear->p2.x - linear->p1.x;
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dy = linear->p2.y - linear->p1.y;
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l = dx * dx + dy * dy;
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if (l == 0)
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return class;
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/*
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* compute how much the input of the gradient walked changes
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* when moving vertically through the whole image
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*/
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inc = height * (double) pixman_fixed_1 * pixman_fixed_1 *
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(dx * v.vector[0] + dy * v.vector[1]) /
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(v.vector[2] * (double) l);
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/* check that casting to integer would result in 0 */
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if (-1 < inc && inc < 1)
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class = SOURCE_IMAGE_CLASS_HORIZONTAL;
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return class;
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}
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static void
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linear_gradient_get_scanline_32 (pixman_image_t *image,
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int x,
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int y,
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int width,
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uint32_t * buffer,
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const uint32_t *mask)
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{
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pixman_vector_t v, unit;
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pixman_fixed_32_32_t l;
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pixman_fixed_48_16_t dx, dy;
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gradient_t *gradient = (gradient_t *)image;
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source_image_t *source = (source_image_t *)image;
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linear_gradient_t *linear = (linear_gradient_t *)image;
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uint32_t *end = buffer + width;
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pixman_gradient_walker_t walker;
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_pixman_gradient_walker_init (&walker, gradient, source->common.repeat);
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/* reference point is the center of the pixel */
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v.vector[0] = pixman_int_to_fixed (x) + pixman_fixed_1 / 2;
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v.vector[1] = pixman_int_to_fixed (y) + pixman_fixed_1 / 2;
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v.vector[2] = pixman_fixed_1;
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if (source->common.transform)
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{
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if (!pixman_transform_point_3d (source->common.transform, &v))
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return;
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unit.vector[0] = source->common.transform->matrix[0][0];
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unit.vector[1] = source->common.transform->matrix[1][0];
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unit.vector[2] = source->common.transform->matrix[2][0];
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}
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else
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{
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unit.vector[0] = pixman_fixed_1;
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unit.vector[1] = 0;
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unit.vector[2] = 0;
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}
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dx = linear->p2.x - linear->p1.x;
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dy = linear->p2.y - linear->p1.y;
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l = dx * dx + dy * dy;
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if (l == 0 || unit.vector[2] == 0)
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{
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/* affine transformation only */
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pixman_fixed_32_32_t t, next_inc;
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double inc;
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if (l == 0 || v.vector[2] == 0)
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{
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t = 0;
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inc = 0;
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}
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else
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{
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double invden, v2;
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invden = pixman_fixed_1 * (double) pixman_fixed_1 /
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(l * (double) v.vector[2]);
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v2 = v.vector[2] * (1. / pixman_fixed_1);
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t = ((dx * v.vector[0] + dy * v.vector[1]) -
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(dx * linear->p1.x + dy * linear->p1.y) * v2) * invden;
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inc = (dx * unit.vector[0] + dy * unit.vector[1]) * invden;
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}
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next_inc = 0;
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if (((pixman_fixed_32_32_t )(inc * width)) == 0)
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{
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register uint32_t color;
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color = _pixman_gradient_walker_pixel (&walker, t);
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while (buffer < end)
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*buffer++ = color;
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}
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else
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{
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int i;
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i = 0;
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while (buffer < end)
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{
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if (!mask || *mask++)
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{
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*buffer = _pixman_gradient_walker_pixel (&walker,
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t + next_inc);
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}
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i++;
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next_inc = inc * i;
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buffer++;
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}
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}
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}
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else
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{
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/* projective transformation */
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double t;
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t = 0;
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while (buffer < end)
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{
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if (!mask || *mask++)
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{
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if (v.vector[2] != 0)
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{
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double invden, v2;
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invden = pixman_fixed_1 * (double) pixman_fixed_1 /
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(l * (double) v.vector[2]);
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v2 = v.vector[2] * (1. / pixman_fixed_1);
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t = ((dx * v.vector[0] + dy * v.vector[1]) -
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(dx * linear->p1.x + dy * linear->p1.y) * v2) * invden;
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}
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*buffer = _pixman_gradient_walker_pixel (&walker, t);
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}
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++buffer;
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v.vector[0] += unit.vector[0];
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v.vector[1] += unit.vector[1];
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v.vector[2] += unit.vector[2];
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}
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}
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}
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static void
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linear_gradient_property_changed (pixman_image_t *image)
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{
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image->common.get_scanline_32 = linear_gradient_get_scanline_32;
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image->common.get_scanline_64 = _pixman_image_get_scanline_generic_64;
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}
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PIXMAN_EXPORT pixman_image_t *
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pixman_image_create_linear_gradient (pixman_point_fixed_t * p1,
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pixman_point_fixed_t * p2,
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const pixman_gradient_stop_t *stops,
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int n_stops)
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{
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pixman_image_t *image;
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linear_gradient_t *linear;
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image = _pixman_image_allocate ();
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if (!image)
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return NULL;
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linear = &image->linear;
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if (!_pixman_init_gradient (&linear->common, stops, n_stops))
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{
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free (image);
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return NULL;
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}
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linear->p1 = *p1;
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linear->p2 = *p2;
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image->type = LINEAR;
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image->common.classify = linear_gradient_classify;
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image->common.property_changed = linear_gradient_property_changed;
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return image;
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}
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