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/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "paint.h"
void
gst_smpte_paint_vbox (guint32 *dest, gint stride,
gint x0, gint y0, gint c0,
gint x1, gint y1, gint c1)
{
gint i, j;
gint width, height;
width = x1 - x0;
height = y1 - y0;
g_assert (width > 0);
g_assert (height > 0);
dest = dest + y0 * stride + x0;
for (i = 0; i < height; i++) {
for (j = 0; j < width; j++) {
dest[j] = (c1 * j + c0 * (width - j)) / width;
}
dest += stride;
}
}
void
gst_smpte_paint_hbox (guint32 *dest, gint stride,
gint x0, gint y0, gint c0,
gint x1, gint y1, gint c1)
{
gint i, j;
gint width, height;
width = x1 - x0;
height = y1 - y0;
g_assert (width > 0);
g_assert (height > 0);
g_print ("vbox: %d %d %d %d %d %d\n", x0, y0, c0, x1, y1, c1);
dest = dest + y0 * stride + x0;
for (i = 0; i < height; i++) {
guint32 value = (c1 * i + c0 * (height - i)) / height;
for (j = 0; j < width; j++) {
dest[j] = value;
}
dest += stride;
}
}
#define STEP_3D_LINE(dxabs,dyabs,dzabs,sdx,sdy,sdz,xr,yr,zr,px,py,pz) \
G_STMT_START { \
if (dxabs >= dyabs && dxabs >= dzabs) { \
yr += dyabs; \
zr += dzabs; \
if (yr >= dxabs) { \
py += sdy; \
yr -= dxabs; \
} \
if (zr >= dzabs) { \
pz += sdz; \
zr -= dxabs; \
} \
px += sdx; \
} else if (dyabs >= dxabs && dyabs >= dzabs) { \
xr += dxabs; \
zr += dzabs; \
if (xr >= dyabs) { \
px += sdx; \
xr -= dyabs; \
} \
if (zr >= dzabs) { \
pz += sdz; \
zr -= dyabs; \
} \
py += sdy; \
} else { \
yr += dyabs; \
xr += dxabs; \
if (yr >= dyabs) { \
py += sdy; \
yr -= dzabs; \
} \
if (xr >= dyabs) { \
px += sdx; \
xr -= dzabs; \
} \
pz += sdz; \
} \
} G_STMT_END
#define SWAP(a,b) \
G_STMT_START { \
typeof (a) tmp; \
tmp = (a); \
(a) = (b); \
(b) = (tmp); \
} G_STMT_END
#define SIGN(a) ((a) < 0 ? -1 : 1)
#define PREPARE_3D_LINE(x0,y0,z0,x1,y1,z1,dxabs,dyabs,dzabs,sdx,sdy,sdz,xr,yr,zr,px,py,pz)\
G_STMT_START { \
typeof (x0) dx, dy, dz; \
dx = x1 - x0; \
dy = y1 - y0; \
dz = z1 - z0; \
dxabs = abs (dx); \
dyabs = abs (dy); \
dzabs = abs (dz); \
sdx = SIGN (dx); \
sdy = SIGN (dy); \
sdz = SIGN (dz); \
xr = dxabs >> 1; \
yr = dyabs >> 1; \
zr = dzabs >> 1; \
px = x0; \
py = y0; \
pz = z0; \
} G_STMT_END
void
gst_smpte_paint_triangle_linear (guint32 *dest, gint stride,
gint x0, gint y0, gint c0,
gint x1, gint y1, gint c1, gint x2, gint y2, gint c2)
{
gint sdxl, sdyl, sdcl, dxlabs, dylabs, dclabs, xrl, yrl, crl, pxl, pyl, pcl;
gint sdxr, sdyr, sdcr, dxrabs, dyrabs, dcrabs, xrr, yrr, crr, pxr, pyr, pcr;
gint i, j, k, seg_start, seg_end;
if (y0 > y1) { SWAP (x0, x1); SWAP (y0, y1); SWAP (c0, c1); }
if (y0 > y2) { SWAP (x0, x2); SWAP (y0, y2); SWAP (c0, c2); }
if (y1 > y2) { SWAP (x1, x2); SWAP (y1, y2); SWAP (c1, c2); }
PREPARE_3D_LINE (x0,y0,c0,x2,y2,c2,
dxlabs,dylabs,dclabs,
sdxl, sdyl,sdcl,
xrl,yrl,crl,
pxl,pyl,pcl);
PREPARE_3D_LINE (x0,y0,c0,x1,y1,c1,
dxrabs,dyrabs,dcrabs,
sdxr, sdyr,sdcr,
xrr,yrr,crr,
pxr,pyr,pcr);
dest = dest + stride * y0;
seg_start = y0;
seg_end = y1;
/* do two passes */
for (k = 0; k < 2; k++) {
for (i = seg_start; i < seg_end; i++) {
gint s = pxl, e = pxr, sc = pcl, ec = pcr;
gint sign = SIGN (e - s);
e += sign;
for (j = s; j != e; j+=sign) {
dest[j] = (ec * (j - s) + sc * (e - j)) / (e - s);
}
while (pyr == i) {
STEP_3D_LINE (dxrabs, dyrabs, dcrabs, sdxr, sdyr, sdcr,
xrr, yrr, crr, pxr, pyr, pcr);
}
while (pyl == i) {
STEP_3D_LINE (dxlabs, dylabs, dclabs, sdxl, sdyl, sdcl,
xrl, yrl, crl, pxl, pyl, pcl);
}
dest += stride;
}
PREPARE_3D_LINE (x1,y1,c1,x2,y2,c2,
dxrabs,dyrabs,dcrabs,
sdxr, sdyr,sdcr,
xrr,yrr,crr,
pxr,pyr,pcr);
seg_start = y1;
seg_end = y2;
}
}
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