--- /dev/null
+/*
+ * $Id$
+ *
+ * Copyright © 2004 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 <config.h>
+#include "pixman-private.h"
+
+typedef uint32_t FbBits;
+
+void
+pixman_add_traps (pixman_image_t * image,
+ int16_t x_off,
+ int16_t y_off,
+ int ntrap,
+ pixman_trap_t *traps)
+{
+ int bpp;
+ int width;
+ int height;
+
+ pixman_fixed_t x_off_fixed;
+ pixman_fixed_t y_off_fixed;
+ pixman_edge_t l, r;
+ pixman_fixed_t t, b;
+
+ width = image->bits.width;
+ height = image->bits.height;
+ bpp = PIXMAN_FORMAT_BPP (image->bits.format);
+
+ x_off_fixed = pixman_int_to_fixed(y_off);
+ y_off_fixed = pixman_int_to_fixed(y_off);
+
+ while (ntrap--)
+ {
+ t = traps->top.y + y_off_fixed;
+ if (t < 0)
+ t = 0;
+ t = pixman_sample_ceil_y (t, bpp);
+
+ b = traps->bot.y + y_off_fixed;
+ if (pixman_fixed_to_int (b) >= height)
+ b = pixman_int_to_fixed (height) - 1;
+ b = pixman_sample_floor_y (b, bpp);
+
+ if (b >= t)
+ {
+ /* initialize edge walkers */
+ pixman_edge_init (&l, bpp, t,
+ traps->top.l + x_off_fixed,
+ traps->top.y + y_off_fixed,
+ traps->bot.l + x_off_fixed,
+ traps->bot.y + y_off_fixed);
+
+ pixman_edge_init (&r, bpp, t,
+ traps->top.r + x_off_fixed,
+ traps->top.y + y_off_fixed,
+ traps->bot.r + x_off_fixed,
+ traps->bot.y + y_off_fixed);
+
+ pixman_rasterize_edges (image, &l, &r, t, b);
+ }
+ traps++;
+ }
+
+ fbFinishAccess (pPicture->pDrawable);
+}
+
+void
+pixman_rasterize_trapezoid (pixman_image_t * image,
+ pixman_trapezoid_t *trap,
+ int x_off,
+ int y_off)
+{
+ int bpp;
+ int width;
+ int height;
+
+ pixman_fixed_t x_off_fixed;
+ pixman_fixed_t y_off_fixed;
+ pixman_edge_t l, r;
+ pixman_fixed_t t, b;
+
+ if (!pixman_trapezoid_valid (trap))
+ return;
+
+ width = image->bits.width;
+ height = image->bits.height;
+ bpp = PIXMAN_FORMAT_BPP (image->bits.format);
+
+ x_off_fixed = pixman_int_to_fixed(x_off);
+ y_off_fixed = pixman_int_to_fixed(y_off);
+ t = trap->top + y_off_fixed;
+ if (t < 0)
+ t = 0;
+ t = pixman_sample_ceil_y (t, bpp);
+
+ b = trap->bottom + y_off_fixed;
+ if (pixman_fixed_to_int (b) >= height)
+ b = pixman_int_to_fixed (height) - 1;
+ b = pixman_sample_floor_y (b, bpp);
+
+ if (b >= t)
+ {
+ /* initialize edge walkers */
+ pixman_line_fixed_edge_init (&l, bpp, t, &trap->left, x_off, y_off);
+ pixman_line_fixed_edge_init (&r, bpp, t, &trap->right, x_off, y_off);
+
+ pixman_rasterize_edges (image, &l, &r, t, b);
+ }
+}
+
+#if 0
+static int
+_GreaterY (pixman_point_fixed_t *a, 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 (pixman_point_fixed_t *ref, pixman_point_fixed_t *a, 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;
+}
+
+/* FIXME -- this could be made more efficient */
+void
+fbAddTriangles (pixman_image_t * pPicture,
+ int16_t x_off,
+ int16_t y_off,
+ int ntri,
+ xTriangle *tris)
+{
+ pixman_point_fixed_t *top, *left, *right, *tmp;
+ xTrapezoid trap;
+
+ for (; ntri; ntri--, tris++)
+ {
+ top = &tris->p1;
+ left = &tris->p2;
+ right = &tris->p3;
+ if (_GreaterY (top, left)) {
+ tmp = left; left = top; top = tmp;
+ }
+ if (_GreaterY (top, right)) {
+ tmp = right; right = top; top = tmp;
+ }
+ if (_Clockwise (top, right, left)) {
+ tmp = right; right = left; left = tmp;
+ }
+
+ /*
+ * Two cases:
+ *
+ * + +
+ * / \ / \
+ * / \ / \
+ * / + + \
+ * / -- -- \
+ * / -- -- \
+ * / --- --- \
+ * +-- --+
+ */
+
+ trap.top = top->y;
+ trap.left.p1 = *top;
+ trap.left.p2 = *left;
+ trap.right.p1 = *top;
+ trap.right.p2 = *right;
+ if (right->y < left->y)
+ trap.bottom = right->y;
+ else
+ trap.bottom = left->y;
+ fbRasterizeTrapezoid (pPicture, &trap, x_off, y_off);
+ if (right->y < left->y)
+ {
+ trap.top = right->y;
+ trap.bottom = left->y;
+ trap.right.p1 = *right;
+ trap.right.p2 = *left;
+ }
+ else
+ {
+ trap.top = left->y;
+ trap.bottom = right->y;
+ trap.left.p1 = *left;
+ trap.left.p2 = *right;
+ }
+ fbRasterizeTrapezoid (pPicture, &trap, x_off, y_off);
+ }
+}
+#endif
projects / platform / upstream / pixman.git / commitdiff