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/*
* Copyright © 2005 Novell, 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
* Novell, Inc. not be used in advertising or publicity pertaining to
* distribution of the software without specific, written prior permission.
* Novell, Inc. makes no representations about the suitability of this
* software for any purpose. It is provided "as is" without express or
* implied warranty.
*
* NOVELL, INC. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN
* NO EVENT SHALL NOVELL, INC. 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.
*
* Author: David Reveman <davidr@novell.com>
*/
#ifdef HAVE_CONFIG_H
# include "../config.h"
#endif
#include "glitzint.h"
/* whether 't' is a well defined not obviously empty trapezoid */
#define TRAPEZOID_VALID(t) ((t)->left.p1.y != (t)->left.p2.y && \
(t)->right.p1.y != (t)->right.p2.y && \
(int) ((t)->bottom - (t)->top) > 0)
/* whether 't' is a well defined not obviously empty trap */
#define TRAP_VALID(t) ((int) ((t)->bottom.y - (t)->top.y) > 0)
typedef struct _glitz_edge {
glitz_float_t dx, dy;
glitz_float_t x0, y0;
glitz_float_t kx, ky;
glitz_float_t tx, bx;
glitz_float_t hypx;
int hyp;
} glitz_edge_t;
#define EDGE_INIT(e, p1x, p1y, p2x, p2y) \
(e)->hyp = 1; \
(e)->dx = (p2x) - (p1x); \
(e)->dy = (p2y) - (p1y); \
if ((e)->dy) \
(e)->kx = (e)->dx / (e)->dy; \
else \
(e)->kx = 0; \
(e)->x0 = (p1x) - (e)->kx * (p1y); \
if ((e)->dx) \
(e)->ky = (e)->dy / (e)->dx; \
else \
(e)->ky = 0; \
(e)->y0 = (p1y) - (e)->ky * (p1x)
#define EDGE_X(e, _y) (((e)->kx * (_y)) + (e)->x0)
#define EDGE_Y(e, _x) (((e)->ky * (_x)) + (e)->y0)
#define EDGE_INTERSECT_BOX(upper_x, lower_y, left_y, right_y, \
box_x1, box_x2, box_y1, box_y2, \
max_x, max_y, \
_x1, _y1, _x2, _y2) \
if (upper_x < (box_x1)) \
{ \
(_x1) = 0.0f; \
(_y1) = (left_y) - (box_y1); \
} \
else if ((upper_x) > (box_x2)) \
{ \
(_x1) = (max_x); \
(_y1) = (right_y) - (box_y1); \
} \
else \
{ \
(_x1) = (upper_x) - (box_x1); \
(_y1) = 0.0f; \
} \
if ((lower_x) < (box_x1)) \
{ \
(_x2) = 0.0f; \
(_y2) = (left_y) - (box_y1); \
} \
else if ((lower_x) > (box_x2)) \
{ \
(_x2) = (max_x); \
(_y2) = (right_y) - (box_y1); \
} \
else \
{ \
(_x2) = (lower_x) - (box_x1); \
(_y2) = (max_y); \
}
#define AREA_ABOVE_LEFT(x1, y1, x2, y2, bottom) \
((x1) * (y1) + \
(((x1) + (x2)) / 2.0f) * ((y2) - (y1)) + \
(x2) * ((bottom) - (y2)))
/*
Given a single pixel position this function calculates
trapezoid pixel coverage.
*/
static glitz_float_t
_glitz_pixel_area (glitz_float_t pixel_x,
glitz_float_t pixel_y,
glitz_float_t top,
glitz_float_t bottom,
glitz_edge_t *left,
glitz_edge_t *right)
{
glitz_float_t area;
glitz_float_t upper_x, lower_x;
glitz_float_t left_y, right_y;
glitz_float_t pixel_x_1 = pixel_x + 1.0f;
glitz_float_t pixel_y_1 = pixel_y + 1.0f;
glitz_float_t x1, x2, y1, y2;
if (bottom >= pixel_y_1)
bottom = 1.0f;
else
bottom = bottom - pixel_y;
if (top <= pixel_y)
top = 0.0f;
else
top = top - pixel_y;
if (right->ky)
{
upper_x = EDGE_X (right, pixel_y);
lower_x = EDGE_X (right, pixel_y_1);
left_y = EDGE_Y (right, pixel_x);
right_y = EDGE_Y (right, pixel_x_1);
EDGE_INTERSECT_BOX (upper_x, lower_y, left_y, right_y,
pixel_x, pixel_x_1, pixel_y, pixel_y_1,
1.0f, 1.0f, x1, y1, x2, y2);
if (bottom <= y1)
{
if (left_y > right_y)
area = bottom;
else
area = 0.0f;
}
else
{
if (bottom < y2)
{
x2 -= right->kx * (y2 - bottom);
y2 = bottom;
}
area = AREA_ABOVE_LEFT (x1, y1, x2, y2, bottom);
}
if (top <= y1)
{
if (left_y > right_y)
area -= top;
}
else
{
if (top < y2)
{
x2 -= right->kx * (y2 - top);
y2 = top;
}
area -= AREA_ABOVE_LEFT (x1, y1, x2, y2, top);
}
}
else
{
/* Vertical Edge */
if (right->x0 < pixel_x_1)
area = (right->x0 - pixel_x) * (bottom - top);
else
area = bottom - top;
}
if (left->kx)
{
upper_x = EDGE_X (left, pixel_y);
lower_x = EDGE_X (left, pixel_y_1);
left_y = EDGE_Y (left, pixel_x);
right_y = EDGE_Y (left, pixel_x_1);
EDGE_INTERSECT_BOX (upper_x, lower_y, left_y, right_y,
pixel_x, pixel_x_1, pixel_y, pixel_y_1,
1.0f, 1.0f, x1, y1, x2, y2);
if (bottom <= y1)
{
if (left_y > right_y)
area -= bottom;
}
else
{
if (bottom < y2)
{
x2 -= left->kx * (y2 - bottom);
y2 = bottom;
}
area -= AREA_ABOVE_LEFT (x1, y1, x2, y2, bottom);
}
if (top <= y1)
{
if (left_y > right_y)
area += top;
}
else
{
if (top < y2)
{
x2 -= left->kx * (y2 - top);
y2 = top;
}
area += AREA_ABOVE_LEFT (x1, y1, x2, y2, top);
}
}
else
{
/* Vertical Edge */
if (left->x0 > pixel_x)
area -= (left->x0 - pixel_x) * (bottom - top);
}
return area;
}
#define TRAPINIT(trap, _top, _bottom, _left, _right) \
if (!TRAPEZOID_VALID (trap)) \
continue; \
\
(_top) = FIXED_TO_FLOAT ((trap)->top); \
(_bottom) = FIXED_TO_FLOAT ((trap)->bottom); \
\
(_left)->tx = FIXED_TO_FLOAT ((trap)->left.p1.x); \
(_left)->bx = FIXED_TO_FLOAT ((trap)->left.p1.y); \
\
(_right)->tx = FIXED_TO_FLOAT ((trap)->right.p1.x); \
(_right)->bx = FIXED_TO_FLOAT ((trap)->right.p1.y); \
\
EDGE_INIT (_left, \
(_left)->tx, (_left)->bx, \
FIXED_TO_FLOAT ((trap)->left.p2.x), \
FIXED_TO_FLOAT ((trap)->left.p2.y)); \
\
EDGE_INIT (_right, \
(_right)->tx, (_right)->bx, \
FIXED_TO_FLOAT ((trap)->right.p2.x), \
FIXED_TO_FLOAT ((trap)->right.p2.y)); \
\
if ((_left)->dx) \
{ \
(_left)->tx = EDGE_X (_left, _top); \
(_left)->bx = EDGE_X (_left, _bottom); \
} else \
(_left)->tx = (_left)->bx = (_left)->x0; \
\
if ((_right)->dx) \
{ \
(_right)->tx = EDGE_X (_right, _top); \
(_right)->bx = EDGE_X (_right, _bottom); \
} else \
(_right)->tx = (_right)->bx = (_right)->x0
#define TRAP glitz_trapezoid_t
#define UNIT glitz_short_t
#define TRAPS _glitz_add_trapezoids_short
#include "glitz_trapimp.h"
#undef TRAPS
#undef UNIT
#define UNIT glitz_int_t
#define TRAPS _glitz_add_trapezoids_int
#include "glitz_trapimp.h"
#undef TRAPS
#undef UNIT
#define UNIT glitz_float_t
#define TRAPS _glitz_add_trapezoids_float
#include "glitz_trapimp.h"
#undef TRAPS
#undef UNIT
#define UNIT glitz_double_t
#define TRAPS _glitz_add_trapezoids_double
#include "glitz_trapimp.h"
#undef TRAPS
#undef UNIT
#undef TRAP
#undef TRAPINIT
#define TRAPINIT(trap, _top, _bottom, _left, _right) \
if (!TRAP_VALID (trap)) \
continue; \
\
(_top) = FIXED_TO_FLOAT ((trap)->top.y); \
(_bottom) = FIXED_TO_FLOAT ((trap)->bottom.y); \
\
(_left)->tx = FIXED_TO_FLOAT ((trap)->top.left); \
(_left)->bx = FIXED_TO_FLOAT ((trap)->bottom.left); \
\
(_right)->tx = FIXED_TO_FLOAT ((trap)->top.right); \
(_right)->bx = FIXED_TO_FLOAT ((trap)->bottom.right); \
\
EDGE_INIT (_left, \
(_left)->tx, _top, \
(_left)->bx, _bottom); \
\
EDGE_INIT (_right, \
(_right)->tx, _top, \
(_right)->bx, _bottom)
#define TRAP glitz_trap_t
#define UNIT glitz_short_t
#define TRAPS _glitz_add_traps_short
#include "glitz_trapimp.h"
#undef TRAPS
#undef UNIT
#define UNIT glitz_int_t
#define TRAPS _glitz_add_traps_int
#include "glitz_trapimp.h"
#undef TRAPS
#undef UNIT
#define UNIT glitz_float_t
#define TRAPS _glitz_add_traps_float
#include "glitz_trapimp.h"
#undef TRAPS
#undef UNIT
#define UNIT glitz_double_t
#define TRAPS _glitz_add_traps_double
#include "glitz_trapimp.h"
#undef TRAPS
#undef UNIT
#undef TRAP
#undef TRAPINIT
int
glitz_add_trapezoids (glitz_buffer_t *buffer,
int offset,
unsigned int size,
glitz_data_type_t type,
glitz_surface_t *mask,
glitz_trapezoid_t *traps,
int n_traps,
int *n_added)
{
int count, n = n_traps;
uint8_t *ptr;
*n_added = 0;
ptr = glitz_buffer_map (buffer, GLITZ_BUFFER_ACCESS_WRITE_ONLY);
if (!ptr)
return 0;
ptr += offset;
switch (type) {
case GLITZ_DATA_TYPE_SHORT:
count = _glitz_add_trapezoids_short (ptr, size, mask, traps, &n_traps);
break;
case GLITZ_DATA_TYPE_INT:
count = _glitz_add_trapezoids_int (ptr, size, mask, traps, &n_traps);
break;
case GLITZ_DATA_TYPE_DOUBLE:
count = _glitz_add_trapezoids_double (ptr, size, mask,
traps, &n_traps);
break;
default:
count = _glitz_add_trapezoids_float (ptr, size, mask, traps, &n_traps);
break;
}
if (glitz_buffer_unmap (buffer))
return 0;
*n_added = n - n_traps;
return count;
}
int
glitz_add_traps (glitz_buffer_t *buffer,
int offset,
unsigned int size,
glitz_data_type_t type,
glitz_surface_t *mask,
glitz_trap_t *traps,
int n_traps,
int *n_added)
{
int count, n = n_traps;
uint8_t *ptr;
*n_added = 0;
ptr = glitz_buffer_map (buffer, GLITZ_BUFFER_ACCESS_WRITE_ONLY);
if (!ptr)
return 0;
ptr += offset;
switch (type) {
case GLITZ_DATA_TYPE_SHORT:
count = _glitz_add_traps_short (ptr, size, mask, traps, &n_traps);
break;
case GLITZ_DATA_TYPE_INT:
count = _glitz_add_traps_int (ptr, size, mask, traps, &n_traps);
break;
case GLITZ_DATA_TYPE_DOUBLE:
count = _glitz_add_traps_double (ptr, size, mask, traps, &n_traps);
break;
default:
count = _glitz_add_traps_float (ptr, size, mask, traps, &n_traps);
break;
}
if (glitz_buffer_unmap (buffer))
return 0;
*n_added = n - n_traps;
return count;
}
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