gstreamer/gst/videoscale/videoscale.c

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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.
*/
#define DEBUG_ENABLED
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
#include <stdlib.h>
#include <math.h>
#include <videoscale.h>
#include <string.h>
#include "gstvideoscale.h"
#undef HAVE_CPU_I386
#ifdef HAVE_CPU_I386
#include "videoscale_x86.h"
#endif
/* scalers */
static void gst_videoscale_scale_nearest (GstVideoscale * scale,
unsigned char *dest, unsigned char *src, int sw, int sh, int dw, int dh);
#if 0
static void gst_videoscale_scale_plane_slow (GstVideoscale * scale,
unsigned char *src, unsigned char *dest, int sw, int sh, int dw, int dh);
static void gst_videoscale_scale_point_sample (GstVideoscale * scale,
unsigned char *src, unsigned char *dest, int sw, int sh, int dw, int dh);
/* filters */
static unsigned char gst_videoscale_bilinear (unsigned char *src, double x,
double y, int sw, int sh);
static unsigned char gst_videoscale_bicubic (unsigned char *src, double x,
double y, int sw, int sh);
#endif
static void gst_videoscale_planar411 (GstVideoscale * scale,
unsigned char *dest, unsigned char *src);
static void gst_videoscale_planar400 (GstVideoscale * scale,
unsigned char *dest, unsigned char *src);
static void gst_videoscale_packed422 (GstVideoscale * scale,
unsigned char *dest, unsigned char *src);
static void gst_videoscale_packed422rev (GstVideoscale * scale,
unsigned char *dest, unsigned char *src);
static void gst_videoscale_32bit (GstVideoscale * scale, unsigned char *dest,
unsigned char *src);
static void gst_videoscale_24bit (GstVideoscale * scale, unsigned char *dest,
unsigned char *src);
static void gst_videoscale_16bit (GstVideoscale * scale, unsigned char *dest,
unsigned char *src);
static void gst_videoscale_scale_nearest_str2 (GstVideoscale * scale,
unsigned char *dest, unsigned char *src, int sw, int sh, int dw, int dh);
static void gst_videoscale_scale_nearest_str4 (GstVideoscale * scale,
unsigned char *dest, unsigned char *src, int sw, int sh, int dw, int dh);
static void gst_videoscale_scale_nearest_32bit (GstVideoscale * scale,
unsigned char *dest, unsigned char *src, int sw, int sh, int dw, int dh);
static void gst_videoscale_scale_nearest_24bit (GstVideoscale * scale,
unsigned char *dest, unsigned char *src, int sw, int sh, int dw, int dh);
static void gst_videoscale_scale_nearest_16bit (GstVideoscale * scale,
unsigned char *dest, unsigned char *src, int sw, int sh, int dw, int dh);
#define fourcc_YUY2 GST_MAKE_FOURCC('Y','U','Y','2')
#define fourcc_UYVY GST_MAKE_FOURCC('U','Y','V','Y')
#define fourcc_Y422 GST_MAKE_FOURCC('Y','4','2','2')
#define fourcc_UYNV GST_MAKE_FOURCC('U','Y','N','V')
#define fourcc_YVYU GST_MAKE_FOURCC('Y','V','Y','U')
#define fourcc_YV12 GST_MAKE_FOURCC('Y','V','1','2')
#define fourcc_I420 GST_MAKE_FOURCC('I','4','2','0')
#define fourcc_Y800 GST_MAKE_FOURCC('Y','8','0','0')
#define fourcc_RGB_ GST_MAKE_FOURCC('R','G','B',' ')
struct videoscale_format_struct videoscale_formats[] = {
/* packed */
{fourcc_YUY2, 16, gst_videoscale_packed422,},
{fourcc_UYVY, 16, gst_videoscale_packed422rev,},
{fourcc_Y422, 16, gst_videoscale_packed422rev,},
{fourcc_UYNV, 16, gst_videoscale_packed422rev,},
{fourcc_YVYU, 16, gst_videoscale_packed422,},
/* planar */
{fourcc_YV12, 12, gst_videoscale_planar411,},
{fourcc_I420, 12, gst_videoscale_planar411,},
{fourcc_Y800, 8, gst_videoscale_planar400,},
/* RGB */
{fourcc_RGB_, 32, gst_videoscale_32bit, 24, G_BIG_ENDIAN, 0x00ff0000,
0x0000ff00, 0x000000ff},
{fourcc_RGB_, 32, gst_videoscale_32bit, 24, G_BIG_ENDIAN, 0x000000ff,
0x0000ff00, 0x00ff0000},
{fourcc_RGB_, 32, gst_videoscale_32bit, 24, G_BIG_ENDIAN, 0xff000000,
0x00ff0000, 0x0000ff00},
{fourcc_RGB_, 32, gst_videoscale_32bit, 24, G_BIG_ENDIAN, 0x0000ff00,
0x00ff0000, 0xff000000},
{fourcc_RGB_, 24, gst_videoscale_24bit, 24, G_BIG_ENDIAN, 0xff0000, 0x00ff00,
0x0000ff},
{fourcc_RGB_, 24, gst_videoscale_24bit, 24, G_BIG_ENDIAN, 0x0000ff, 0x00ff00,
0xff0000},
{fourcc_RGB_, 16, gst_videoscale_16bit, 16, G_BYTE_ORDER, 0xf800, 0x07e0,
0x001f},
{fourcc_RGB_, 16, gst_videoscale_16bit, 15, G_BYTE_ORDER, 0x7c00, 0x03e0,
0x001f},
};
int videoscale_n_formats =
sizeof (videoscale_formats) / sizeof (videoscale_formats[0]);
GstStructure *
videoscale_get_structure (struct videoscale_format_struct *format)
{
GstStructure *structure;
if (format->scale == NULL)
return NULL;
if (format->depth) {
structure = gst_structure_new ("video/x-raw-rgb",
"depth", G_TYPE_INT, format->depth,
"bpp", G_TYPE_INT, format->bpp,
"endianness", G_TYPE_INT, format->endianness,
"red_mask", G_TYPE_INT, format->red_mask,
"green_mask", G_TYPE_INT, format->green_mask,
"blue_mask", G_TYPE_INT, format->blue_mask, NULL);
} else {
structure = gst_structure_new ("video/x-raw-yuv",
"format", GST_TYPE_FOURCC, format->fourcc, NULL);
}
gst_structure_set (structure,
"width", GST_TYPE_INT_RANGE, 100, G_MAXINT,
"height", GST_TYPE_INT_RANGE, 100, G_MAXINT,
"framerate", GST_TYPE_DOUBLE_RANGE, 0.0, G_MAXDOUBLE, NULL);
return structure;
}
struct videoscale_format_struct *
videoscale_find_by_structure (GstStructure * structure)
{
int i;
gboolean ret;
struct videoscale_format_struct *format;
GST_DEBUG ("finding %s", gst_structure_to_string (structure));
g_return_val_if_fail (structure != NULL, NULL);
if (strcmp (gst_structure_get_name (structure), "video/x-raw-yuv") == 0) {
unsigned int fourcc;
ret = gst_structure_get_fourcc (structure, "format", &fourcc);
if (!ret)
return NULL;
for (i = 0; i < videoscale_n_formats; i++) {
format = videoscale_formats + i;
if (format->depth == 0 && format->fourcc == fourcc) {
return format;
}
}
} else {
int bpp;
int depth;
int endianness;
int red_mask;
int green_mask;
int blue_mask;
ret = gst_structure_get_int (structure, "bpp", &bpp);
ret &= gst_structure_get_int (structure, "depth", &depth);
ret &= gst_structure_get_int (structure, "endianness", &endianness);
ret &= gst_structure_get_int (structure, "red_mask", &red_mask);
ret &= gst_structure_get_int (structure, "green_mask", &green_mask);
ret &= gst_structure_get_int (structure, "blue_mask", &blue_mask);
if (!ret)
return NULL;
for (i = 0; i < videoscale_n_formats; i++) {
format = videoscale_formats + i;
if (format->bpp == bpp && format->depth == depth &&
format->endianness == endianness && format->red_mask == red_mask &&
format->green_mask == green_mask && format->blue_mask == blue_mask) {
return format;
}
}
}
return NULL;
}
void
gst_videoscale_setup (GstVideoscale * videoscale)
{
g_return_if_fail (GST_IS_VIDEOSCALE (videoscale));
g_return_if_fail (videoscale->format != NULL);
GST_DEBUG_OBJECT (videoscale, "format=%p " GST_FOURCC_FORMAT
" from %dx%d to %dx%d",
videoscale->format,
GST_FOURCC_ARGS (videoscale->format->fourcc),
videoscale->from_width, videoscale->from_height,
videoscale->to_width, videoscale->to_height);
if (videoscale->to_width == 0 || videoscale->to_height == 0 ||
videoscale->from_width == 0 || videoscale->from_height == 0) {
g_critical ("bad sizes %dx%d %dx%d",
videoscale->from_width, videoscale->from_height,
videoscale->to_width, videoscale->to_height);
return;
}
if (videoscale->to_width == videoscale->from_width &&
videoscale->to_height == videoscale->from_height) {
GST_DEBUG_OBJECT (videoscale, "using passthru");
videoscale->passthru = TRUE;
videoscale->inited = TRUE;
return;
}
GST_DEBUG_OBJECT (videoscale, "scaling method POINT_SAMPLE");
videoscale->from_buf_size = (videoscale->from_width * videoscale->from_height
* videoscale->format->bpp) / 8;
videoscale->to_buf_size = (videoscale->to_width * videoscale->to_height
* videoscale->format->bpp) / 8;
videoscale->passthru = FALSE;
videoscale->inited = TRUE;
}
#if 0
static void
gst_videoscale_scale_rgb (GstVideoscale * scale, unsigned char *dest,
unsigned char *src)
{
int sw = scale->from_width;
int sh = scale->from_height;
int dw = scale->to_width;
int dh = scale->to_height;
GST_DEBUG_OBJECT (scale, "scaling RGB %dx%d to %dx%d", sw, sh, dw, dh);
switch (scale->scale_bytes) {
case 2:
dw = ((dw + 1) & ~1) << 1;
sw = sw << 1;
break;
case 4:
dw = ((dw + 2) & ~3) << 2;
sw = sw << 2;
break;
default:
break;
}
GST_DEBUG_OBJECT (scale, "%p %p", src, dest);
//scale->scaler(scale, src, dest, sw, sh, dw, dh);
}
#endif
static void
gst_videoscale_planar411 (GstVideoscale * scale, unsigned char *dest,
unsigned char *src)
{
int sw = scale->from_width;
int sh = scale->from_height;
int dw = scale->to_width;
int dh = scale->to_height;
GST_DEBUG_OBJECT (scale, "scaling planar 4:1:1 %dx%d to %dx%d", sw, sh, dw,
dh);
gst_videoscale_scale_nearest (scale, dest, src, sw, sh, dw, dh);
src += sw * sh;
dest += dw * dh;
dh = dh >> 1;
dw = dw >> 1;
sh = sh >> 1;
sw = sw >> 1;
gst_videoscale_scale_nearest (scale, dest, src, sw, sh, dw, dh);
src += sw * sh;
dest += dw * dh;
gst_videoscale_scale_nearest (scale, dest, src, sw, sh, dw, dh);
}
static void
gst_videoscale_planar400 (GstVideoscale * scale, unsigned char *dest,
unsigned char *src)
{
int sw = scale->from_width;
int sh = scale->from_height;
int dw = scale->to_width;
int dh = scale->to_height;
GST_DEBUG_OBJECT (scale, "scaling Y-only %dx%d to %dx%d", sw, sh, dw, dh);
gst_videoscale_scale_nearest (scale, dest, src, sw, sh, dw, dh);
}
static void
gst_videoscale_packed422 (GstVideoscale * scale, unsigned char *dest,
unsigned char *src)
{
int sw = scale->from_width;
int sh = scale->from_height;
int dw = scale->to_width;
int dh = scale->to_height;
GST_DEBUG_OBJECT (scale, "scaling 4:2:2 %dx%d to %dx%d", sw, sh, dw, dh);
gst_videoscale_scale_nearest_str2 (scale, dest, src, sw, sh, dw, dh);
gst_videoscale_scale_nearest_str4 (scale, dest + 1, src + 1, sw / 2, sh,
dw / 2, dh);
gst_videoscale_scale_nearest_str4 (scale, dest + 3, src + 3, sw / 2, sh,
dw / 2, dh);
}
static void
gst_videoscale_packed422rev (GstVideoscale * scale, unsigned char *dest,
unsigned char *src)
{
int sw = scale->from_width;
int sh = scale->from_height;
int dw = scale->to_width;
int dh = scale->to_height;
GST_DEBUG_OBJECT (scale, "scaling 4:2:2 %dx%d to %dx%d", sw, sh, dw, dh);
gst_videoscale_scale_nearest_str2 (scale, dest + 1, src, sw, sh, dw, dh);
gst_videoscale_scale_nearest_str4 (scale, dest, src + 1, sw / 2, sh, dw / 2,
dh);
gst_videoscale_scale_nearest_str4 (scale, dest + 2, src + 3, sw / 2, sh,
dw / 2, dh);
}
static void
gst_videoscale_32bit (GstVideoscale * scale, unsigned char *dest,
unsigned char *src)
{
int sw = scale->from_width;
int sh = scale->from_height;
int dw = scale->to_width;
int dh = scale->to_height;
GST_DEBUG_OBJECT (scale, "scaling 32bit %dx%d to %dx%d", sw, sh, dw, dh);
gst_videoscale_scale_nearest_32bit (scale, dest, src, sw, sh, dw, dh);
}
static void
gst_videoscale_24bit (GstVideoscale * scale, unsigned char *dest,
unsigned char *src)
{
int sw = scale->from_width;
int sh = scale->from_height;
int dw = scale->to_width;
int dh = scale->to_height;
GST_DEBUG_OBJECT (scale, "scaling 24bit %dx%d to %dx%d", sw, sh, dw, dh);
gst_videoscale_scale_nearest_24bit (scale, dest, src, sw, sh, dw, dh);
}
static void
gst_videoscale_16bit (GstVideoscale * scale, unsigned char *dest,
unsigned char *src)
{
int sw = scale->from_width;
int sh = scale->from_height;
int dw = scale->to_width;
int dh = scale->to_height;
GST_DEBUG_OBJECT (scale, "scaling 16bit %dx%d to %dx%d", sw, sh, dw, dh);
gst_videoscale_scale_nearest_16bit (scale, dest, src, sw, sh, dw, dh);
}
#if 0
#define RC(x,y) *(src+(int)(x)+(int)((y)*sw))
static unsigned char
gst_videoscale_bilinear (unsigned char *src, double x, double y, int sw, int sh)
{
int j = floor (x);
int k = floor (y);
double a = x - j;
double b = y - k;
double dest;
int color;
GST_DEBUG_OBJECT (scale, "scaling bilinear %f %f %dx%d", x, y, sw, sh);
dest = (1 - a) * (1 - b) * RC (j, k) + a * (1 - b) * RC (j + 1, k);
k = MIN (sh - 1, k);
dest += b * (1 - a) * RC (j, k + 1) + a * b * RC (j + 1, k + 1);
color = rint (dest);
if (color < 0)
color = abs (color); /* cannot have negative values ! */
/*if (color<0) color=0; // cannot have negative values ! */
if (color > 255)
color = 255;
return (unsigned char) color;
}
static unsigned char
gst_videoscale_bicubic (unsigned char *src, double x, double y, int sw, int sh)
{
int j = floor (x);
int k = floor (y), k2;
double a = x - j;
double b = y - k;
double dest;
int color;
double t1, t2, t3, t4;
double a1, a2, a3, a4;
GST_DEBUG_OBJECT (scale, "scaling bicubic %dx%d", sw, sh);
a1 = -a * (1 - a) * (1 - a);
a2 = (1 - 2 * a * a + a * a * a);
a3 = a * (1 + a - a * a);
a4 = a * a * (1 - a);
k2 = MAX (0, k - 1);
t1 = a1 * RC (j - 1, k2) + a2 * RC (j, k2) + a3 * RC (j + 1,
k2) - a4 * RC (j + 2, k2);
t2 = a1 * RC (j - 1, k) + a2 * RC (j, k) + a3 * RC (j + 1,
k) - a4 * RC (j + 2, k);
k2 = MIN (sh, k + 1);
t3 = a1 * RC (j - 1, k2) + a2 * RC (j, k2) + a3 * RC (j + 1,
k2) - a4 * RC (j + 2, k2);
k2 = MIN (sh, k + 2);
t4 = a1 * RC (j - 1, k2) + a2 * RC (j, k2) + a3 * RC (j + 1,
k2) - a4 * RC (j + 2, k2);
dest =
-b * (1 - b) * (1 - b) * t1 + (1 - 2 * b * b + b * b * b) * t2 + b * (1 +
b - b * b) * t3 + b * b * (b - 1) * t4;
color = rint (dest);
if (color < 0)
color = abs (color); /* cannot have negative values ! */
if (color > 255)
color = 255;
return (unsigned char) color;
}
static void
gst_videoscale_scale_plane_slow (GstVideoscale * scale, unsigned char *src,
unsigned char *dest, int sw, int sh, int dw, int dh)
{
double zoomx = ((double) dw) / (double) sw;
double zoomy = ((double) dh) / (double) sh;
double xr, yr;
int x, y;
GST_DEBUG_OBJECT (scale, "scale plane slow %dx%d %dx%d %g %g %p %p", sw, sh,
dw, dh, zoomx, zoomy, src, dest);
for (y = 0; y < dh; y++) {
yr = ((double) y) / zoomy;
for (x = 0; x < dw; x++) {
xr = ((double) x) / zoomx;
GST_DEBUG_OBJECT (scale, "scale plane slow %g %g %p", xr, yr,
(src + (int) (x) + (int) ((y) * sw)));
if (floor (xr) == xr && floor (yr) == yr) {
GST_DEBUG_OBJECT (scale, "scale plane %g %g %p %p", xr, yr,
(src + (int) (x) + (int) ((y) * sw)), dest);
*dest++ = RC (xr, yr);
} else {
*dest++ = scale->filter (src, xr, yr, sw, sh);
/**dest++ = gst_videoscale_bicubic(src, xr, yr, sw, sh); */
}
}
}
}
#endif
#if 0
static void
gst_videoscale_scale_point_sample (GstVideoscale * scale, unsigned char *src,
unsigned char *dest, int sw, int sh, int dw, int dh)
{
int ypos, yinc, y;
int xpos, xinc, x;
int sum, xcount, ycount, loop;
unsigned char *srcp, *srcp2;
GST_DEBUG_OBJECT (scale, "scaling nearest point sample %p %p %d", src, dest,
dw);
ypos = 0x10000;
yinc = (sh << 16) / dh;
xinc = (sw << 16) / dw;
for (y = dh; y; y--) {
ycount = 1;
srcp = src;
while (ypos > 0x10000) {
ycount++;
ypos -= 0x10000;
src += sw;
}
xpos = 0x10000;
for (x = dw; x; x--) {
xcount = 0;
sum = 0;
while (xpos >= 0x10000L) {
loop = ycount;
srcp2 = srcp;
while (loop--) {
sum += *srcp2;
srcp2 += sw;
}
srcp++;
xcount++;
xpos -= 0x10000L;
}
*dest++ = sum / (xcount * ycount);
xpos += xinc;
}
ypos += yinc;
}
}
#endif
static void
gst_videoscale_scale_nearest (GstVideoscale * scale,
unsigned char *dest, unsigned char *src, int sw, int sh, int dw, int dh)
{
int ypos, yinc, y;
int xpos, xinc, x;
guchar *destp;
guchar *srcp;
GST_DEBUG_OBJECT (scale, "scaling nearest %p %p %d", src, dest, dw);
ypos = 0;
yinc = (sh << 16) / dh;
xinc = (sw << 16) / dw;
for (y = dh; y; y--) {
if (ypos >= 0x10000) {
src += (ypos >> 16) * sw;
ypos &= 0xffff;
}
xpos = 0;
srcp = src;
destp = dest;
for (x = dw; x; x--) {
if (xpos >= 0x10000) {
srcp += (xpos >> 16);
xpos &= 0xffff;
}
*destp++ = *srcp;
xpos += xinc;
}
dest += dw;
ypos += yinc;
}
}
static void
gst_videoscale_scale_nearest_str2 (GstVideoscale * scale,
unsigned char *dest, unsigned char *src, int sw, int sh, int dw, int dh)
{
int ypos, yinc, y;
int xpos, xinc, x;
guchar *destp;
guchar *srcp;
GST_DEBUG_OBJECT (scale, "scaling nearest %p %p %d", src, dest, dw);
ypos = 0;
yinc = (sh << 16) / dh;
xinc = (sw << 16) / dw;
for (y = dh; y; y--) {
if (ypos >= 0x10000) {
src += (ypos >> 16) * sw * 2;
ypos &= 0xffff;
}
xpos = 0;
srcp = src;
destp = dest;
for (x = dw; x; x--) {
if (xpos >= 0x10000) {
srcp += (xpos >> 16) * 2;
xpos &= 0xffff;
}
*destp = *srcp;
destp += 2;
xpos += xinc;
}
dest += dw * 2;
ypos += yinc;
}
}
static void
gst_videoscale_scale_nearest_str4 (GstVideoscale * scale,
unsigned char *dest, unsigned char *src, int sw, int sh, int dw, int dh)
{
int ypos, yinc, y;
int xpos, xinc, x;
guchar *destp;
guchar *srcp;
GST_DEBUG_OBJECT (scale, "scaling nearest %p %p %d", src, dest, dw);
ypos = 0;
yinc = (sh << 16) / dh;
xinc = (sw << 16) / dw;
for (y = dh; y; y--) {
if (ypos >= 0x10000) {
src += (ypos >> 16) * sw * 4;
ypos &= 0xffff;
}
xpos = 0;
srcp = src;
destp = dest;
for (x = dw; x; x--) {
if (xpos >= 0x10000) {
srcp += (xpos >> 16) * 4;
xpos &= 0xffff;
}
*destp = *srcp;
destp += 4;
xpos += xinc;
}
dest += dw * 4;
ypos += yinc;
}
}
static void
gst_videoscale_scale_nearest_32bit (GstVideoscale * scale,
unsigned char *dest, unsigned char *src, int sw, int sh, int dw, int dh)
{
int ypos, yinc, y;
int xpos, xinc, x;
guchar *destp;
guchar *srcp;
GST_DEBUG_OBJECT (scale, "scaling nearest %p %p %d", src, dest, dw);
ypos = 0;
yinc = (sh << 16) / dh;
xinc = (sw << 16) / dw;
for (y = dh; y; y--) {
if (ypos >= 0x10000) {
src += (ypos >> 16) * sw * 4;
ypos &= 0xffff;
}
xpos = 0;
srcp = src;
destp = dest;
for (x = dw; x; x--) {
if (xpos >= 0x10000) {
srcp += (xpos >> 16) * 4;
xpos &= 0xffff;
}
*(guint32 *) destp = *(guint32 *) srcp;
destp += 4;
xpos += xinc;
}
dest += dw * 4;
ypos += yinc;
}
}
static void
gst_videoscale_scale_nearest_24bit (GstVideoscale * scale,
unsigned char *dest, unsigned char *src, int sw, int sh, int dw, int dh)
{
int ypos, yinc, y;
int xpos, xinc, x;
guchar *destp;
guchar *srcp;
GST_DEBUG_OBJECT (scale, "scaling nearest %p %p %d", src, dest, dw);
ypos = 0;
yinc = (sh << 16) / dh;
xinc = (sw << 16) / dw;
for (y = dh; y; y--) {
if (ypos >= 0x10000) {
src += (ypos >> 16) * sw * 3;
ypos &= 0xffff;
}
xpos = 0;
srcp = src;
destp = dest;
for (x = dw; x; x--) {
if (xpos >= 0x10000) {
srcp += (xpos >> 16) * 3;
xpos &= 0xffff;
}
destp[0] = srcp[0];
destp[1] = srcp[1];
destp[2] = srcp[2];
destp += 3;
xpos += xinc;
}
dest += dw * 3;
ypos += yinc;
}
}
static void
gst_videoscale_scale_nearest_16bit (GstVideoscale * scale,
unsigned char *dest, unsigned char *src, int sw, int sh, int dw, int dh)
{
int ypos, yinc, y;
int xpos, xinc, x;
guchar *destp;
guchar *srcp;
GST_DEBUG_OBJECT (scale, "scaling nearest %p %p %d", src, dest, dw);
ypos = 0;
yinc = (sh << 16) / dh;
xinc = (sw << 16) / dw;
for (y = dh; y; y--) {
if (ypos >= 0x10000) {
src += (ypos >> 16) * sw * 2;
ypos &= 0xffff;
}
xpos = 0;
srcp = src;
destp = dest;
for (x = dw; x; x--) {
if (xpos >= 0x10000) {
srcp += (xpos >> 16) * 2;
xpos &= 0xffff;
}
destp[0] = srcp[0];
destp[1] = srcp[1];
destp += 2;
xpos += xinc;
}
dest += dw * 2;
ypos += yinc;
}
}