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xrdp/libxrdp/xrdp_bitmap32_compress.c

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/**
* xrdp: A Remote Desktop Protocol server.
*
* Copyright (C) Jay Sorg 2014
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* planar bitmap compressor
* 32 bpp compression
*/
/*
RDP 6.0 Bitmap Compression
http://msdn.microsoft.com/en-us/library/cc241877.aspx
*/
#if defined(HAVE_CONFIG_H)
#include <config_ac.h>
#endif
#include "libxrdp.h"
#define FLAGS_RLE 0x10
#define FLAGS_NOALPHA 0x20
#define LLOG_LEVEL 1
#define LLOGLN(_level, _args) \
do { if (_level < LLOG_LEVEL) { g_writeln _args ; } } while (0)
#define LHEXDUMP(_level, _args) \
do { if (_level < LLOG_LEVEL) { g_hexdump _args ; } } while (0)
/*****************************************************************************/
/* split RGB */
static int
fsplit3(char *in_data, int start_line, int width, int e,
char *r_data, char *g_data, char *b_data)
{
#if defined(L_ENDIAN)
int rp;
int gp;
int bp;
#endif
int index;
int out_index;
int pixel;
int cy;
int *ptr32;
cy = 0;
out_index = 0;
while (start_line >= 0)
{
ptr32 = (int *) (in_data + start_line * width * 4);
index = 0;
#if defined(L_ENDIAN)
while (index + 4 <= width)
{
pixel = *ptr32;
ptr32++;
rp = (pixel >> 16) & 0x000000ff;
gp = (pixel >> 8) & 0x000000ff;
bp = (pixel >> 0) & 0x000000ff;
pixel = *ptr32;
ptr32++;
rp |= (pixel >> 8) & 0x0000ff00;
gp |= (pixel << 0) & 0x0000ff00;
bp |= (pixel << 8) & 0x0000ff00;
pixel = *ptr32;
ptr32++;
rp |= (pixel >> 0) & 0x00ff0000;
gp |= (pixel << 8) & 0x00ff0000;
bp |= (pixel << 16) & 0x00ff0000;
pixel = *ptr32;
ptr32++;
rp |= (pixel << 8) & 0xff000000;
gp |= (pixel << 16) & 0xff000000;
bp |= (pixel << 24) & 0xff000000;
*((int*)(r_data + out_index)) = rp;
*((int*)(g_data + out_index)) = gp;
*((int*)(b_data + out_index)) = bp;
out_index += 4;
index += 4;
}
#endif
while (index < width)
{
pixel = *ptr32;
ptr32++;
r_data[out_index] = pixel >> 16;
g_data[out_index] = pixel >> 8;
b_data[out_index] = pixel >> 0;
out_index++;
index++;
}
for (index = 0; index < e; index++)
{
r_data[out_index] = r_data[out_index - 1];
g_data[out_index] = g_data[out_index - 1];
b_data[out_index] = b_data[out_index - 1];
out_index++;
}
start_line--;
cy++;
if (out_index + width + e > 64 * 64)
{
break;
}
}
return cy;
}
/*****************************************************************************/
/* split ARGB */
static int
fsplit4(char *in_data, int start_line, int width, int e,
char *a_data, char *r_data, char *g_data, char *b_data)
{
#if defined(L_ENDIAN)
int ap;
int rp;
int gp;
int bp;
#endif
int index;
int out_index;
int pixel;
int cy;
int *ptr32;
cy = 0;
out_index = 0;
while (start_line >= 0)
{
ptr32 = (int *) (in_data + start_line * width * 4);
index = 0;
#if defined(L_ENDIAN)
while (index + 4 <= width)
{
pixel = *ptr32;
ptr32++;
ap = (pixel >> 24) & 0x000000ff;
rp = (pixel >> 16) & 0x000000ff;
gp = (pixel >> 8) & 0x000000ff;
bp = (pixel >> 0) & 0x000000ff;
pixel = *ptr32;
ptr32++;
ap |= (pixel >> 16) & 0x0000ff00;
rp |= (pixel >> 8) & 0x0000ff00;
gp |= (pixel << 0) & 0x0000ff00;
bp |= (pixel << 8) & 0x0000ff00;
pixel = *ptr32;
ptr32++;
ap |= (pixel >> 8) & 0x00ff0000;
rp |= (pixel >> 0) & 0x00ff0000;
gp |= (pixel << 8) & 0x00ff0000;
bp |= (pixel << 16) & 0x00ff0000;
pixel = *ptr32;
ptr32++;
ap |= (pixel << 0) & 0xff000000;
rp |= (pixel << 8) & 0xff000000;
gp |= (pixel << 16) & 0xff000000;
bp |= (pixel << 24) & 0xff000000;
*((int*)(a_data + out_index)) = ap;
*((int*)(r_data + out_index)) = rp;
*((int*)(g_data + out_index)) = gp;
*((int*)(b_data + out_index)) = bp;
out_index += 4;
index += 4;
}
#endif
while (index < width)
{
pixel = *ptr32;
ptr32++;
a_data[out_index] = pixel >> 24;
r_data[out_index] = pixel >> 16;
g_data[out_index] = pixel >> 8;
b_data[out_index] = pixel >> 0;
out_index++;
index++;
}
for (index = 0; index < e; index++)
{
a_data[out_index] = a_data[out_index - 1];
r_data[out_index] = r_data[out_index - 1];
g_data[out_index] = g_data[out_index - 1];
b_data[out_index] = b_data[out_index - 1];
out_index++;
}
start_line--;
cy++;
if (out_index + width + e > 64 * 64)
{
break;
}
}
return cy;
}
/*****************************************************************************/
#define DELTA_ONE \
do { \
delta = src8[cx] - src8[0]; \
is_neg = (delta >> 7) & 1; \
dst8[cx] = (((delta ^ -is_neg) + is_neg) << 1) - is_neg; \
src8++; \
dst8++; \
} while (0)
/*****************************************************************************/
static int
fdelta(char *in_plane, char *out_plane, int cx, int cy)
{
char delta;
char is_neg;
char *src8;
char *dst8;
char *src8_end;
g_memcpy(out_plane, in_plane, cx);
src8 = in_plane;
dst8 = out_plane;
src8_end = src8 + (cx * cy - cx);
while (src8 + 8 <= src8_end)
{
DELTA_ONE;
DELTA_ONE;
DELTA_ONE;
DELTA_ONE;
DELTA_ONE;
DELTA_ONE;
DELTA_ONE;
DELTA_ONE;
}
while (src8 < src8_end)
{
DELTA_ONE;
}
return 0;
}
/*****************************************************************************/
static int
fout(int collen, int replen, char *colptr, struct stream *s)
{
int code;
int lcollen;
int lreplen;
int cont;
LLOGLN(10, ("fout: collen %d replen %d", collen, replen));
cont = collen > 13;
while (cont)
{
lcollen = collen;
if (lcollen > 15)
{
lcollen = 15;
}
code = lcollen << 4;
out_uint8(s, code);
out_uint8a(s, colptr, lcollen);
colptr += lcollen;
collen -= lcollen;
cont = collen > 13;
}
cont = (collen > 0) || (replen > 0);
while (cont)
{
lreplen = replen;
if ((collen == 0) && (lreplen > 15))
{
/* big run */
if (lreplen > 47)
{
lreplen = 47;
}
LLOGLN(10, ("fout: big run lreplen %d", lreplen));
replen -= lreplen;
code = ((lreplen & 0xF) << 4) | ((lreplen & 0xF0) >> 4);
out_uint8(s, code);
colptr += lreplen;
}
else
{
if (lreplen > 15)
{
lreplen = 15;
}
replen -= lreplen;
if (lreplen < 3)
{
collen += lreplen;
lreplen = 0;
}
code = (collen << 4) | lreplen;
out_uint8(s, code);
out_uint8a(s, colptr, collen);
colptr += collen + lreplen;
collen = 0;
}
cont = replen > 0;
}
return 0;
}
/*****************************************************************************/
static int
fpack(char *plane, int cx, int cy, struct stream *s)
{
char *ptr8;
char *colptr;
char *lend;
char *holdp;
int jndex;
int collen;
int replen;
LLOGLN(10, ("fpack:"));
holdp = s->p;
for (jndex = 0; jndex < cy; jndex++)
{
LLOGLN(10, ("line start line %d cx %d cy %d", jndex, cx, cy));
ptr8 = plane + jndex * cx;
LHEXDUMP(10, (ptr8, cx));
lend = ptr8 + (cx - 1);
colptr = ptr8;
if (colptr[0] == 0)
{
collen = 0;
replen = 1;
}
else
{
collen = 1;
replen = 0;
}
while (ptr8 < lend)
{
if (ptr8[0] == ptr8[1])
{
replen++;
}
else
{
if (replen > 0)
{
if (replen < 3)
{
collen += replen + 1;
replen = 0;
}
else
{
fout(collen, replen, colptr, s);
colptr = ptr8 + 1;
replen = 0;
collen = 1;
}
}
else
{
collen++;
}
}
ptr8++;
}
/* end of line */
fout(collen, replen, colptr, s);
}
return (int) (s->p - holdp);
}
/*****************************************************************************/
static int
foutraw3(struct stream *s, int bytes, int header,
char *r_data, char *g_data, char *b_data)
{
out_uint8(s, header);
out_uint8a(s, r_data, bytes);
out_uint8a(s, g_data, bytes);
out_uint8a(s, b_data, bytes);
/* pad if no RLE */
out_uint8(s, 0x00);
return 0;
}
/*****************************************************************************/
static int
foutraw4(struct stream *s, int bytes, int header,
char *a_data, char *r_data, char *g_data, char *b_data)
{
out_uint8(s, header);
out_uint8a(s, a_data, bytes);
out_uint8a(s, r_data, bytes);
out_uint8a(s, g_data, bytes);
out_uint8a(s, b_data, bytes);
/* pad if no RLE */
out_uint8(s, 0x00);
return 0;
}
/*****************************************************************************/
/* returns the number of lines compressed */
int
xrdp_bitmap32_compress(char *in_data, int width, int height,
struct stream *s, int bpp, int byte_limit,
int start_line, struct stream *temp_s,
int e, int flags)
{
char *a_data;
char *r_data;
char *g_data;
char *b_data;
char *sa_data;
char *sr_data;
char *sg_data;
char *sb_data;
char *hold_p;
int a_bytes;
int r_bytes;
int g_bytes;
int b_bytes;
int cx;
int cy;
int max_bytes;
int total_bytes;
int header;
LLOGLN(10, ("xrdp_bitmap32_compress:"));
max_bytes = 4 * 1024;
/* need max 8, 4K planes for work */
if (max_bytes * 8 > temp_s->size)
{
return 0;
}
header = flags & 0xFF;
cx = width + e;
sa_data = temp_s->data;
sr_data = sa_data + max_bytes;
sg_data = sr_data + max_bytes;
sb_data = sg_data + max_bytes;
a_data = sb_data + max_bytes;
r_data = a_data + max_bytes;
g_data = r_data + max_bytes;
b_data = g_data + max_bytes;
hold_p = s->p;
if (header & FLAGS_NOALPHA)
{
cy = fsplit3(in_data, start_line, width, e,
sr_data, sg_data, sb_data);
if (header & FLAGS_RLE)
{
fdelta(sr_data, r_data, cx, cy);
fdelta(sg_data, g_data, cx, cy);
fdelta(sb_data, b_data, cx, cy);
while (cy > 0)
{
s->p = hold_p;
out_uint8(s, header);
r_bytes = fpack(r_data, cx, cy, s);
g_bytes = fpack(g_data, cx, cy, s);
b_bytes = fpack(b_data, cx, cy, s);
max_bytes = cx * cy * 3;
total_bytes = r_bytes + g_bytes + b_bytes;
if (total_bytes > max_bytes)
{
if (2 + max_bytes <= byte_limit)
{
s->p = hold_p;
foutraw3(s, cx * cy, FLAGS_NOALPHA, sr_data, sg_data, sb_data);
break;
}
}
if (1 + total_bytes <= byte_limit)
{
break;
}
cy--;
}
}
else
{
while (cy > 0)
{
max_bytes = cx * cy * 3;
if (2 + max_bytes <= byte_limit)
{
s->p = hold_p;
foutraw3(s, cx * cy, FLAGS_NOALPHA, sr_data, sg_data, sb_data);
break;
}
cy--;
}
}
}
else
{
cy = fsplit4(in_data, start_line, width, e,
sa_data, sr_data, sg_data, sb_data);
if (header & FLAGS_RLE)
{
fdelta(sa_data, a_data, cx, cy);
fdelta(sr_data, r_data, cx, cy);
fdelta(sg_data, g_data, cx, cy);
fdelta(sb_data, b_data, cx, cy);
while (cy > 0)
{
s->p = hold_p;
out_uint8(s, header);
a_bytes = fpack(a_data, cx, cy, s);
r_bytes = fpack(r_data, cx, cy, s);
g_bytes = fpack(g_data, cx, cy, s);
b_bytes = fpack(b_data, cx, cy, s);
max_bytes = cx * cy * 4;
total_bytes = a_bytes + r_bytes + g_bytes + b_bytes;
if (total_bytes > max_bytes)
{
if (2 + max_bytes <= byte_limit)
{
s->p = hold_p;
foutraw4(s, cx * cy, 0, sa_data, sr_data, sg_data, sb_data);
break;
}
}
if (1 + total_bytes <= byte_limit)
{
break;
}
cy--;
}
}
else
{
while (cy > 0)
{
max_bytes = cx * cy * 4;
if (2 + max_bytes <= byte_limit)
{
s->p = hold_p;
foutraw4(s, cx * cy, 0, sa_data, sr_data, sg_data, sb_data);
break;
}
cy--;
}
}
}
return cy;
}
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