mirror of
https://github.com/ultimatepp/ultimatepp.git
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284 lines
7 KiB
C
284 lines
7 KiB
C
/*
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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 "pixman-private.h"
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typedef uint32_t FbBits;
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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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pixman_trap_t *traps)
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{
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int bpp;
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int width;
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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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width = image->bits.width;
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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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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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{
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printf ("%s is not a regular image\n", title);
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}
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if (!image->bits.format == PIXMAN_a8)
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{
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printf ("%s is not an alpha mask\n", title);
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}
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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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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 width;
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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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return_if_fail (image->type == BITS);
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if (!pixman_trapezoid_valid (trap))
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return;
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width = image->bits.width;
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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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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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#if 0
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static int
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_GreaterY (pixman_point_fixed_t *a, pixman_point_fixed_t *b)
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{
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if (a->y == b->y)
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return a->x > b->x;
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return a->y > b->y;
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}
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/*
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* Note that the definition of this function is a bit odd because
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* of the X coordinate space (y increasing downwards).
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*/
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static int
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_Clockwise (pixman_point_fixed_t *ref, pixman_point_fixed_t *a, pixman_point_fixed_t *b)
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{
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pixman_point_fixed_t ad, bd;
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ad.x = a->x - ref->x;
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ad.y = a->y - ref->y;
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bd.x = b->x - ref->x;
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bd.y = b->y - ref->y;
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return ((pixman_fixed_32_32_t) bd.y * ad.x - (pixman_fixed_32_32_t) ad.y * bd.x) < 0;
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}
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/* FIXME -- this could be made more efficient */
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void
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fbAddTriangles (pixman_image_t * pPicture,
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int16_t x_off,
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int16_t y_off,
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int ntri,
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xTriangle *tris)
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{
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pixman_point_fixed_t *top, *left, *right, *tmp;
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xTrapezoid trap;
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for (; ntri; ntri--, tris++)
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{
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top = &tris->p1;
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left = &tris->p2;
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right = &tris->p3;
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if (_GreaterY (top, left)) {
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tmp = left; left = top; top = tmp;
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}
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if (_GreaterY (top, right)) {
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tmp = right; right = top; top = tmp;
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}
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if (_Clockwise (top, right, left)) {
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tmp = right; right = left; left = tmp;
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}
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/*
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* Two cases:
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*
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* + +
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* / \ / \
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* / \ / \
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* / + + \
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* / -- -- \
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* / -- -- \
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* / --- --- \
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* +-- --+
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*/
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trap.top = top->y;
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trap.left.p1 = *top;
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trap.left.p2 = *left;
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trap.right.p1 = *top;
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trap.right.p2 = *right;
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if (right->y < left->y)
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trap.bottom = right->y;
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else
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trap.bottom = left->y;
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fbRasterizeTrapezoid (pPicture, &trap, x_off, y_off);
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if (right->y < left->y)
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{
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trap.top = right->y;
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trap.bottom = left->y;
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trap.right.p1 = *right;
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trap.right.p2 = *left;
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}
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else
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{
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trap.top = left->y;
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trap.bottom = right->y;
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trap.left.p1 = *left;
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trap.left.p2 = *right;
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}
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fbRasterizeTrapezoid (pPicture, &trap, x_off, y_off);
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}
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}
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#endif
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