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ictrap.c
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ictrap.c
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/*
* $Id: ictrap.c,v 1.25 2005/05/13 03:25:07 keithp Exp $
*
* Copyright © 2002 Keith Packard
*
* 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.
*
* KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
* EVENT SHALL KEITH PACKARD 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 "icint.h"
pixman_image_t *
IcCreateAlphaPicture (pixman_image_t *dst,
pixman_format_t *format,
uint16_t width,
uint16_t height)
{
pixman_image_t *image;
int own_format = 0;
if (width > 32767 || height > 32767)
return 0;
if (!format)
{
own_format = 1;
if (dst->polyEdge == PolyEdgeSharp)
format = pixman_format_create (PIXMAN_FORMAT_NAME_A1);
else
format = pixman_format_create (PIXMAN_FORMAT_NAME_A8);
if (!format)
return 0;
}
image = pixman_image_create (format, width, height);
if (own_format)
pixman_format_destroy (format);
/* XXX: Is this a reasonable way to clear the image? Would
probably be preferable to use pixman_image_fill_rectangle once such a
beast exists. */
memset (image->pixels->data, 0, height * image->pixels->stride);
return image;
}
static pixman_fixed16_16_t
pixman_line_fixed_x (const pixman_line_fixed_t *l, pixman_fixed16_16_t y, int ceil)
{
pixman_fixed16_16_t dx = l->p2.x - l->p1.x;
xFixed_32_32 ex = (xFixed_32_32) (y - l->p1.y) * dx;
pixman_fixed16_16_t dy = l->p2.y - l->p1.y;
if (ceil)
ex += (dy - 1);
return l->p1.x + (pixman_fixed16_16_t) (ex / dy);
}
static void
pixman_trapezoid_bounds (int ntrap, const pixman_trapezoid_t *traps, pixman_box16_t *box)
{
box->y1 = MAXSHORT;
box->y2 = MINSHORT;
box->x1 = MAXSHORT;
box->x2 = MINSHORT;
for (; ntrap; ntrap--, traps++)
{
int16_t x1, y1, x2, y2;
if (!xTrapezoidValid(traps))
continue;
y1 = xFixedToInt (traps->top);
if (y1 < box->y1)
box->y1 = y1;
y2 = xFixedToInt (xFixedCeil (traps->bottom));
if (y2 > box->y2)
box->y2 = y2;
x1 = xFixedToInt (MIN (pixman_line_fixed_x (&traps->left, traps->top, 0),
pixman_line_fixed_x (&traps->left, traps->bottom, 0)));
if (x1 < box->x1)
box->x1 = x1;
x2 = xFixedToInt (xFixedCeil (MAX (pixman_line_fixed_x (&traps->right, traps->top, 1),
pixman_line_fixed_x (&traps->right, traps->bottom, 1))));
if (x2 > box->x2)
box->x2 = x2;
}
}
/* XXX: There are failure cases in this function. Don't we need to
* propagate the errors out?
*/
void
pixman_composite_trapezoids (pixman_operator_t op,
pixman_image_t *src,
pixman_image_t *dst,
int xSrc,
int ySrc,
const pixman_trapezoid_t *traps,
int ntraps)
{
pixman_image_t *image = NULL;
pixman_box16_t traps_bounds, dst_bounds, bounds;
pixman_region16_t *traps_region, *dst_region;
int16_t xDst, yDst;
int16_t xRel, yRel;
pixman_format_t *format;
if (ntraps == 0)
return;
/*
* Check for solid alpha add
*/
if (op == PIXMAN_OPERATOR_ADD && miIsSolidAlpha (src))
{
for (; ntraps; ntraps--, traps++)
fbRasterizeTrapezoid (dst, traps, 0, 0);
return;
}
xDst = traps[0].left.p1.x >> 16;
yDst = traps[0].left.p1.y >> 16;
pixman_trapezoid_bounds (ntraps, traps, &traps_bounds);
traps_region = pixman_region_create_simple (&traps_bounds);
/* XXX: If the image has a clip region set, we should really be
* fetching it here instead, but it looks like we don't yet expose
* a pixman_image_get_clip_region function. */
dst_bounds.x1 = 0;
dst_bounds.y1 = 0;
dst_bounds.x2 = pixman_image_get_width (dst);
dst_bounds.y2 = pixman_image_get_height (dst);
dst_region = pixman_region_create_simple (&dst_bounds);
pixman_region_intersect (traps_region, traps_region, dst_region);
bounds = *(pixman_region_extents (traps_region));
pixman_region_destroy (traps_region);
pixman_region_destroy (dst_region);
if (bounds.y1 >= bounds.y2 || bounds.x1 >= bounds.x2)
return;
format = pixman_format_create (PIXMAN_FORMAT_NAME_A8);
if (!format)
return;
image = IcCreateAlphaPicture (dst, format,
bounds.x2 - bounds.x1,
bounds.y2 - bounds.y1);
if (!image)
{
pixman_format_destroy (format);
return;
}
for (; ntraps; ntraps--, traps++)
{
if (!xTrapezoidValid(traps))
continue;
fbRasterizeTrapezoid (image, traps,
-bounds.x1, -bounds.y1);
}
xRel = bounds.x1 + xSrc - xDst;
yRel = bounds.y1 + ySrc - yDst;
pixman_composite (op, src, image, dst,
xRel, yRel, 0, 0, bounds.x1, bounds.y1,
bounds.x2 - bounds.x1,
bounds.y2 - bounds.y1);
pixman_image_destroy (image);
pixman_format_destroy (format);
}
void
pixman_add_trapezoids (pixman_image_t *dst,
int x_off,
int y_off,
const pixman_trapezoid_t *traps,
int ntraps)
{
for (; ntraps; ntraps--, traps++)
{
if (!xTrapezoidValid (traps))
continue;
fbRasterizeTrapezoid (dst, traps, x_off, y_off);
}
}