712 lines
16 KiB
C
712 lines
16 KiB
C
/*
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* Copyright © 2002 Keith Packard, member of The XFree86 Project, Inc.
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* Copyright © 2004 Keith Packard
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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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* KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
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* EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
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* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS 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 <stdio.h>
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#include <stdlib.h>
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#include "pixman-private.h"
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/*
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* Compute the smallest value greater than or equal to y which is on a
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* grid row.
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*/
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PIXMAN_EXPORT pixman_fixed_t
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pixman_sample_ceil_y (pixman_fixed_t y, int n)
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{
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pixman_fixed_t f = pixman_fixed_frac (y);
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pixman_fixed_t i = pixman_fixed_floor (y);
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f = DIV (f - Y_FRAC_FIRST (n) + (STEP_Y_SMALL (n) - pixman_fixed_e), STEP_Y_SMALL (n)) * STEP_Y_SMALL (n) +
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Y_FRAC_FIRST (n);
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if (f > Y_FRAC_LAST (n))
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{
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if (pixman_fixed_to_int (i) == 0x7fff)
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{
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f = 0xffff; /* saturate */
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}
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else
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{
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f = Y_FRAC_FIRST (n);
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i += pixman_fixed_1;
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}
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}
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return (i | f);
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}
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/*
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* Compute the largest value strictly less than y which is on a
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* grid row.
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*/
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PIXMAN_EXPORT pixman_fixed_t
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pixman_sample_floor_y (pixman_fixed_t y,
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int n)
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{
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pixman_fixed_t f = pixman_fixed_frac (y);
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pixman_fixed_t i = pixman_fixed_floor (y);
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f = DIV (f - pixman_fixed_e - Y_FRAC_FIRST (n), STEP_Y_SMALL (n)) * STEP_Y_SMALL (n) +
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Y_FRAC_FIRST (n);
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if (f < Y_FRAC_FIRST (n))
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{
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if (pixman_fixed_to_int (i) == 0x8000)
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{
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f = 0; /* saturate */
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}
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else
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{
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f = Y_FRAC_LAST (n);
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i -= pixman_fixed_1;
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}
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}
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return (i | f);
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}
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/*
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* Step an edge by any amount (including negative values)
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*/
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PIXMAN_EXPORT void
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pixman_edge_step (pixman_edge_t *e,
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int n)
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{
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pixman_fixed_48_16_t ne;
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e->x += n * e->stepx;
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ne = e->e + n * (pixman_fixed_48_16_t) e->dx;
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if (n >= 0)
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{
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if (ne > 0)
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{
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int nx = (ne + e->dy - 1) / e->dy;
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e->e = ne - nx * (pixman_fixed_48_16_t) e->dy;
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e->x += nx * e->signdx;
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}
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}
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else
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{
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if (ne <= -e->dy)
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{
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int nx = (-ne) / e->dy;
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e->e = ne + nx * (pixman_fixed_48_16_t) e->dy;
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e->x -= nx * e->signdx;
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}
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}
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}
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/*
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* A private routine to initialize the multi-step
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* elements of an edge structure
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*/
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static void
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_pixman_edge_multi_init (pixman_edge_t * e,
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int n,
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pixman_fixed_t *stepx_p,
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pixman_fixed_t *dx_p)
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{
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pixman_fixed_t stepx;
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pixman_fixed_48_16_t ne;
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ne = n * (pixman_fixed_48_16_t) e->dx;
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stepx = n * e->stepx;
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if (ne > 0)
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{
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int nx = ne / e->dy;
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ne -= nx * (pixman_fixed_48_16_t)e->dy;
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stepx += nx * e->signdx;
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}
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*dx_p = ne;
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*stepx_p = stepx;
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}
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/*
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* Initialize one edge structure given the line endpoints and a
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* starting y value
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*/
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PIXMAN_EXPORT void
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pixman_edge_init (pixman_edge_t *e,
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int n,
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pixman_fixed_t y_start,
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pixman_fixed_t x_top,
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pixman_fixed_t y_top,
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pixman_fixed_t x_bot,
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pixman_fixed_t y_bot)
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{
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pixman_fixed_t dx, dy;
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e->x = x_top;
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e->e = 0;
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dx = x_bot - x_top;
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dy = y_bot - y_top;
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e->dy = dy;
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e->dx = 0;
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if (dy)
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{
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if (dx >= 0)
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{
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e->signdx = 1;
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e->stepx = dx / dy;
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e->dx = dx % dy;
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e->e = -dy;
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}
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else
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{
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e->signdx = -1;
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e->stepx = -(-dx / dy);
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e->dx = -dx % dy;
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e->e = 0;
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}
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_pixman_edge_multi_init (e, STEP_Y_SMALL (n),
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&e->stepx_small, &e->dx_small);
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_pixman_edge_multi_init (e, STEP_Y_BIG (n),
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&e->stepx_big, &e->dx_big);
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}
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pixman_edge_step (e, y_start - y_top);
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}
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/*
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* Initialize one edge structure given a line, starting y value
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* and a pixel offset for the line
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*/
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PIXMAN_EXPORT void
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pixman_line_fixed_edge_init (pixman_edge_t * e,
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int n,
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pixman_fixed_t y,
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const pixman_line_fixed_t *line,
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int x_off,
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int y_off)
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{
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pixman_fixed_t x_off_fixed = pixman_int_to_fixed (x_off);
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pixman_fixed_t y_off_fixed = pixman_int_to_fixed (y_off);
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const pixman_point_fixed_t *top, *bot;
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if (line->p1.y <= line->p2.y)
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{
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top = &line->p1;
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bot = &line->p2;
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}
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else
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{
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top = &line->p2;
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bot = &line->p1;
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}
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pixman_edge_init (e, n, y,
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top->x + x_off_fixed,
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top->y + y_off_fixed,
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bot->x + x_off_fixed,
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bot->y + y_off_fixed);
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}
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PIXMAN_EXPORT void
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pixman_add_traps (pixman_image_t * image,
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int16_t x_off,
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int16_t y_off,
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int ntrap,
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const pixman_trap_t *traps)
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{
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int bpp;
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int height;
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pixman_fixed_t x_off_fixed;
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pixman_fixed_t y_off_fixed;
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pixman_edge_t l, r;
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pixman_fixed_t t, b;
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_pixman_image_validate (image);
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height = image->bits.height;
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bpp = PIXMAN_FORMAT_BPP (image->bits.format);
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x_off_fixed = pixman_int_to_fixed (x_off);
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y_off_fixed = pixman_int_to_fixed (y_off);
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while (ntrap--)
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{
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t = traps->top.y + y_off_fixed;
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if (t < 0)
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t = 0;
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t = pixman_sample_ceil_y (t, bpp);
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b = traps->bot.y + y_off_fixed;
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if (pixman_fixed_to_int (b) >= height)
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b = pixman_int_to_fixed (height) - 1;
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b = pixman_sample_floor_y (b, bpp);
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if (b >= t)
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{
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/* initialize edge walkers */
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pixman_edge_init (&l, bpp, t,
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traps->top.l + x_off_fixed,
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traps->top.y + y_off_fixed,
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traps->bot.l + x_off_fixed,
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traps->bot.y + y_off_fixed);
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pixman_edge_init (&r, bpp, t,
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traps->top.r + x_off_fixed,
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traps->top.y + y_off_fixed,
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traps->bot.r + x_off_fixed,
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traps->bot.y + y_off_fixed);
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pixman_rasterize_edges (image, &l, &r, t, b);
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}
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traps++;
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}
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}
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#if 0
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static void
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dump_image (pixman_image_t *image,
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const char * title)
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{
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int i, j;
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if (!image->type == BITS)
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printf ("%s is not a regular image\n", title);
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if (!image->bits.format == PIXMAN_a8)
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printf ("%s is not an alpha mask\n", title);
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printf ("\n\n\n%s: \n", title);
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for (i = 0; i < image->bits.height; ++i)
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{
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uint8_t *line =
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(uint8_t *)&(image->bits.bits[i * image->bits.rowstride]);
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for (j = 0; j < image->bits.width; ++j)
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printf ("%c", line[j] ? '#' : ' ');
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printf ("\n");
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}
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}
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#endif
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PIXMAN_EXPORT void
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pixman_add_trapezoids (pixman_image_t * image,
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int16_t x_off,
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int y_off,
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int ntraps,
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const pixman_trapezoid_t *traps)
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{
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int i;
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#if 0
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dump_image (image, "before");
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#endif
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for (i = 0; i < ntraps; ++i)
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{
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const pixman_trapezoid_t *trap = &(traps[i]);
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if (!pixman_trapezoid_valid (trap))
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continue;
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pixman_rasterize_trapezoid (image, trap, x_off, y_off);
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}
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#if 0
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dump_image (image, "after");
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#endif
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}
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PIXMAN_EXPORT void
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pixman_rasterize_trapezoid (pixman_image_t * image,
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const pixman_trapezoid_t *trap,
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int x_off,
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int y_off)
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{
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int bpp;
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int height;
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pixman_fixed_t y_off_fixed;
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pixman_edge_t l, r;
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pixman_fixed_t t, b;
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return_if_fail (image->type == BITS);
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_pixman_image_validate (image);
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if (!pixman_trapezoid_valid (trap))
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return;
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height = image->bits.height;
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bpp = PIXMAN_FORMAT_BPP (image->bits.format);
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y_off_fixed = pixman_int_to_fixed (y_off);
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t = trap->top + y_off_fixed;
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if (t < 0)
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t = 0;
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t = pixman_sample_ceil_y (t, bpp);
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b = trap->bottom + y_off_fixed;
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if (pixman_fixed_to_int (b) >= height)
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b = pixman_int_to_fixed (height) - 1;
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b = pixman_sample_floor_y (b, bpp);
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if (b >= t)
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{
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/* initialize edge walkers */
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pixman_line_fixed_edge_init (&l, bpp, t, &trap->left, x_off, y_off);
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pixman_line_fixed_edge_init (&r, bpp, t, &trap->right, x_off, y_off);
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pixman_rasterize_edges (image, &l, &r, t, b);
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}
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}
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static const pixman_bool_t zero_src_has_no_effect[PIXMAN_N_OPERATORS] =
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{
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FALSE, /* Clear 0 0 */
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FALSE, /* Src 1 0 */
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TRUE, /* Dst 0 1 */
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TRUE, /* Over 1 1-Aa */
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TRUE, /* OverReverse 1-Ab 1 */
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FALSE, /* In Ab 0 */
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FALSE, /* InReverse 0 Aa */
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FALSE, /* Out 1-Ab 0 */
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TRUE, /* OutReverse 0 1-Aa */
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TRUE, /* Atop Ab 1-Aa */
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FALSE, /* AtopReverse 1-Ab Aa */
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TRUE, /* Xor 1-Ab 1-Aa */
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TRUE, /* Add 1 1 */
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};
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static pixman_bool_t
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get_trap_extents (pixman_op_t op, pixman_image_t *dest,
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const pixman_trapezoid_t *traps, int n_traps,
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pixman_box32_t *box)
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{
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int i;
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/* When the operator is such that a zero source has an
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* effect on the underlying image, we have to
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* composite across the entire destination
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*/
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if (!zero_src_has_no_effect [op])
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{
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box->x1 = 0;
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box->y1 = 0;
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box->x2 = dest->bits.width;
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box->y2 = dest->bits.height;
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return TRUE;
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}
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box->x1 = INT32_MAX;
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box->y1 = INT32_MAX;
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box->x2 = INT32_MIN;
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box->y2 = INT32_MIN;
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for (i = 0; i < n_traps; ++i)
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{
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const pixman_trapezoid_t *trap = &(traps[i]);
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int y1, y2;
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if (!pixman_trapezoid_valid (trap))
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continue;
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y1 = pixman_fixed_to_int (trap->top);
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if (y1 < box->y1)
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box->y1 = y1;
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y2 = pixman_fixed_to_int (pixman_fixed_ceil (trap->bottom));
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if (y2 > box->y2)
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box->y2 = y2;
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#define EXTEND_MIN(x) \
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if (pixman_fixed_to_int ((x)) < box->x1) \
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box->x1 = pixman_fixed_to_int ((x));
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#define EXTEND_MAX(x) \
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if (pixman_fixed_to_int (pixman_fixed_ceil ((x))) > box->x2) \
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box->x2 = pixman_fixed_to_int (pixman_fixed_ceil ((x)));
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#define EXTEND(x) \
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EXTEND_MIN(x); \
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EXTEND_MAX(x);
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EXTEND(trap->left.p1.x);
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EXTEND(trap->left.p2.x);
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EXTEND(trap->right.p1.x);
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EXTEND(trap->right.p2.x);
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}
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if (box->x1 >= box->x2 || box->y1 >= box->y2)
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return FALSE;
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return TRUE;
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}
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/*
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* pixman_composite_trapezoids()
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*
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* All the trapezoids are conceptually rendered to an infinitely big image.
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* The (0, 0) coordinates of this image are then aligned with the (x, y)
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* coordinates of the source image, and then both images are aligned with
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* the (x, y) coordinates of the destination. Then these three images are
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* composited across the entire destination.
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*/
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PIXMAN_EXPORT void
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pixman_composite_trapezoids (pixman_op_t op,
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pixman_image_t * src,
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pixman_image_t * dst,
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pixman_format_code_t mask_format,
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int x_src,
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int y_src,
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int x_dst,
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int y_dst,
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int n_traps,
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const pixman_trapezoid_t * traps)
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{
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int i;
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return_if_fail (PIXMAN_FORMAT_TYPE (mask_format) == PIXMAN_TYPE_A);
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if (n_traps <= 0)
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return;
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_pixman_image_validate (src);
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_pixman_image_validate (dst);
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if (op == PIXMAN_OP_ADD &&
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(src->common.flags & FAST_PATH_IS_OPAQUE) &&
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(mask_format == dst->common.extended_format_code) &&
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!(dst->common.have_clip_region))
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{
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for (i = 0; i < n_traps; ++i)
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{
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const pixman_trapezoid_t *trap = &(traps[i]);
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if (!pixman_trapezoid_valid (trap))
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continue;
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pixman_rasterize_trapezoid (dst, trap, x_dst, y_dst);
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}
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}
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else
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{
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pixman_image_t *tmp;
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pixman_box32_t box;
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int i;
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if (!get_trap_extents (op, dst, traps, n_traps, &box))
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return;
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if (!(tmp = pixman_image_create_bits (
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mask_format, box.x2 - box.x1, box.y2 - box.y1, NULL, -1)))
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return;
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for (i = 0; i < n_traps; ++i)
|
|
{
|
|
const pixman_trapezoid_t *trap = &(traps[i]);
|
|
|
|
if (!pixman_trapezoid_valid (trap))
|
|
continue;
|
|
|
|
pixman_rasterize_trapezoid (tmp, trap, - box.x1, - box.y1);
|
|
}
|
|
|
|
pixman_image_composite (op, src, tmp, dst,
|
|
x_src + box.x1, y_src + box.y1,
|
|
0, 0,
|
|
x_dst + box.x1, y_dst + box.y1,
|
|
box.x2 - box.x1, box.y2 - box.y1);
|
|
|
|
pixman_image_unref (tmp);
|
|
}
|
|
}
|
|
|
|
static int
|
|
greater_y (const pixman_point_fixed_t *a, const pixman_point_fixed_t *b)
|
|
{
|
|
if (a->y == b->y)
|
|
return a->x > b->x;
|
|
return a->y > b->y;
|
|
}
|
|
|
|
/*
|
|
* Note that the definition of this function is a bit odd because
|
|
* of the X coordinate space (y increasing downwards).
|
|
*/
|
|
static int
|
|
clockwise (const pixman_point_fixed_t *ref,
|
|
const pixman_point_fixed_t *a,
|
|
const pixman_point_fixed_t *b)
|
|
{
|
|
pixman_point_fixed_t ad, bd;
|
|
|
|
ad.x = a->x - ref->x;
|
|
ad.y = a->y - ref->y;
|
|
bd.x = b->x - ref->x;
|
|
bd.y = b->y - ref->y;
|
|
|
|
return ((pixman_fixed_32_32_t) bd.y * ad.x -
|
|
(pixman_fixed_32_32_t) ad.y * bd.x) < 0;
|
|
}
|
|
|
|
static void
|
|
triangle_to_trapezoids (const pixman_triangle_t *tri, pixman_trapezoid_t *traps)
|
|
{
|
|
const pixman_point_fixed_t *top, *left, *right, *tmp;
|
|
|
|
top = &tri->p1;
|
|
left = &tri->p2;
|
|
right = &tri->p3;
|
|
|
|
if (greater_y (top, left))
|
|
{
|
|
tmp = left;
|
|
left = top;
|
|
top = tmp;
|
|
}
|
|
|
|
if (greater_y (top, right))
|
|
{
|
|
tmp = right;
|
|
right = top;
|
|
top = tmp;
|
|
}
|
|
|
|
if (clockwise (top, right, left))
|
|
{
|
|
tmp = right;
|
|
right = left;
|
|
left = tmp;
|
|
}
|
|
|
|
/*
|
|
* Two cases:
|
|
*
|
|
* + +
|
|
* / \ / \
|
|
* / \ / \
|
|
* / + + \
|
|
* / -- -- \
|
|
* / -- -- \
|
|
* / --- --- \
|
|
* +-- --+
|
|
*/
|
|
|
|
traps->top = top->y;
|
|
traps->left.p1 = *top;
|
|
traps->left.p2 = *left;
|
|
traps->right.p1 = *top;
|
|
traps->right.p2 = *right;
|
|
|
|
if (right->y < left->y)
|
|
traps->bottom = right->y;
|
|
else
|
|
traps->bottom = left->y;
|
|
|
|
traps++;
|
|
|
|
*traps = *(traps - 1);
|
|
|
|
if (right->y < left->y)
|
|
{
|
|
traps->top = right->y;
|
|
traps->bottom = left->y;
|
|
traps->right.p1 = *right;
|
|
traps->right.p2 = *left;
|
|
}
|
|
else
|
|
{
|
|
traps->top = left->y;
|
|
traps->bottom = right->y;
|
|
traps->left.p1 = *left;
|
|
traps->left.p2 = *right;
|
|
}
|
|
}
|
|
|
|
static pixman_trapezoid_t *
|
|
convert_triangles (int n_tris, const pixman_triangle_t *tris)
|
|
{
|
|
pixman_trapezoid_t *traps;
|
|
int i;
|
|
|
|
if (n_tris <= 0)
|
|
return NULL;
|
|
|
|
traps = pixman_malloc_ab (n_tris, 2 * sizeof (pixman_trapezoid_t));
|
|
if (!traps)
|
|
return NULL;
|
|
|
|
for (i = 0; i < n_tris; ++i)
|
|
triangle_to_trapezoids (&(tris[i]), traps + 2 * i);
|
|
|
|
return traps;
|
|
}
|
|
|
|
PIXMAN_EXPORT void
|
|
pixman_composite_triangles (pixman_op_t op,
|
|
pixman_image_t * src,
|
|
pixman_image_t * dst,
|
|
pixman_format_code_t mask_format,
|
|
int x_src,
|
|
int y_src,
|
|
int x_dst,
|
|
int y_dst,
|
|
int n_tris,
|
|
const pixman_triangle_t * tris)
|
|
{
|
|
pixman_trapezoid_t *traps;
|
|
|
|
if ((traps = convert_triangles (n_tris, tris)))
|
|
{
|
|
pixman_composite_trapezoids (op, src, dst, mask_format,
|
|
x_src, y_src, x_dst, y_dst,
|
|
n_tris * 2, traps);
|
|
|
|
free (traps);
|
|
}
|
|
}
|
|
|
|
PIXMAN_EXPORT void
|
|
pixman_add_triangles (pixman_image_t *image,
|
|
int32_t x_off,
|
|
int32_t y_off,
|
|
int n_tris,
|
|
const pixman_triangle_t *tris)
|
|
{
|
|
pixman_trapezoid_t *traps;
|
|
|
|
if ((traps = convert_triangles (n_tris, tris)))
|
|
{
|
|
pixman_add_trapezoids (image, x_off, y_off,
|
|
n_tris * 2, traps);
|
|
|
|
free (traps);
|
|
}
|
|
}
|