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/* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This software 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this software; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
#include <stdio.h>
#include <string.h>
#include <rdr/InStream.h>
#include <rdr/OutStream.h>
#include <rfb/PixelFormat.h>
#include <rfb/util.h>
#ifdef _WIN32
#define strcasecmp _stricmp
#endif
using namespace rfb;
PixelFormat::PixelFormat(int b, int d, bool e, bool t,
int rm, int gm, int bm, int rs, int gs, int bs)
: bpp(b), depth(d), bigEndian(e), trueColour(t),
redMax(rm), greenMax(gm), blueMax(bm),
redShift(rs), greenShift(gs), blueShift(bs)
{
}
PixelFormat::PixelFormat()
: bpp(8), depth(8), bigEndian(false), trueColour(true),
redMax(7), greenMax(7), blueMax(3),
redShift(0), greenShift(3), blueShift(6)
{
}
bool PixelFormat::equal(const PixelFormat& other) const
{
return (bpp == other.bpp &&
depth == other.depth &&
(bigEndian == other.bigEndian || bpp == 8) &&
trueColour == other.trueColour &&
(!trueColour || (redMax == other.redMax &&
greenMax == other.greenMax &&
blueMax == other.blueMax &&
redShift == other.redShift &&
greenShift == other.greenShift &&
blueShift == other.blueShift)));
}
void PixelFormat::read(rdr::InStream* is)
{
bpp = is->readU8();
depth = is->readU8();
bigEndian = is->readU8();
trueColour = is->readU8();
redMax = is->readU16();
greenMax = is->readU16();
blueMax = is->readU16();
redShift = is->readU8();
greenShift = is->readU8();
blueShift = is->readU8();
is->skip(3);
}
void PixelFormat::write(rdr::OutStream* os) const
{
os->writeU8(bpp);
os->writeU8(depth);
os->writeU8(bigEndian);
os->writeU8(trueColour);
os->writeU16(redMax);
os->writeU16(greenMax);
os->writeU16(blueMax);
os->writeU8(redShift);
os->writeU8(greenShift);
os->writeU8(blueShift);
os->pad(3);
}
Pixel PixelFormat::pixelFromRGB(rdr::U16 red, rdr::U16 green, rdr::U16 blue,
ColourMap* cm) const
{
if (trueColour) {
rdr::U32 r = ((rdr::U32)red * redMax + 32767) / 65535;
rdr::U32 g = ((rdr::U32)green * greenMax + 32767) / 65535;
rdr::U32 b = ((rdr::U32)blue * blueMax + 32767) / 65535;
return (r << redShift) | (g << greenShift) | (b << blueShift);
} else if (cm) {
// Try to find the closest pixel by Cartesian distance
int colours = 1 << depth;
int diff = 256 * 256 * 4;
int col = 0;
for (int i=0; i<colours; i++) {
int r, g, b;
cm->lookup(i, &r, &g, &b);
int rd = (r-red) >> 8;
int gd = (g-green) >> 8;
int bd = (b-blue) >> 8;
int d = rd*rd + gd*gd + bd*bd;
if (d < diff) {
col = i;
diff = d;
}
}
return col;
}
// XXX just return 0 for colour map?
return 0;
}
void PixelFormat::rgbFromPixel(Pixel p, ColourMap* cm, Colour* rgb) const
{
if (trueColour) {
rgb->r = (((p >> redShift ) & redMax ) * 65535 + redMax /2) / redMax;
rgb->g = (((p >> greenShift) & greenMax) * 65535 + greenMax/2) / greenMax;
rgb->b = (((p >> blueShift ) & blueMax ) * 65535 + blueMax /2) / blueMax;
} else {
cm->lookup(p, &rgb->r, &rgb->g, &rgb->b);
}
}
void PixelFormat::print(char* str, int len) const
{
// Unfortunately snprintf is not widely available so we build the string up
// using strncat - not pretty, but should be safe against buffer overruns.
char num[20];
if (len < 1) return;
str[0] = 0;
strncat(str, "depth ", len-1-strlen(str));
sprintf(num,"%d",depth);
strncat(str, num, len-1-strlen(str));
strncat(str, " (", len-1-strlen(str));
sprintf(num,"%d",bpp);
strncat(str, num, len-1-strlen(str));
strncat(str, "bpp)", len-1-strlen(str));
if (bpp != 8) {
if (bigEndian)
strncat(str, " big-endian", len-1-strlen(str));
else
strncat(str, " little-endian", len-1-strlen(str));
}
if (!trueColour) {
strncat(str, " color-map", len-1-strlen(str));
return;
}
if (blueShift == 0 && greenShift > blueShift && redShift > greenShift &&
blueMax == (1 << greenShift) - 1 &&
greenMax == (1 << (redShift-greenShift)) - 1 &&
redMax == (1 << (depth-redShift)) - 1)
{
strncat(str, " rgb", len-1-strlen(str));
sprintf(num,"%d",depth-redShift);
strncat(str, num, len-1-strlen(str));
sprintf(num,"%d",redShift-greenShift);
strncat(str, num, len-1-strlen(str));
sprintf(num,"%d",greenShift);
strncat(str, num, len-1-strlen(str));
return;
}
if (redShift == 0 && greenShift > redShift && blueShift > greenShift &&
redMax == (1 << greenShift) - 1 &&
greenMax == (1 << (blueShift-greenShift)) - 1 &&
blueMax == (1 << (depth-blueShift)) - 1)
{
strncat(str, " bgr", len-1-strlen(str));
sprintf(num,"%d",depth-blueShift);
strncat(str, num, len-1-strlen(str));
sprintf(num,"%d",blueShift-greenShift);
strncat(str, num, len-1-strlen(str));
sprintf(num,"%d",greenShift);
strncat(str, num, len-1-strlen(str));
return;
}
strncat(str, " rgb max ", len-1-strlen(str));
sprintf(num,"%d,",redMax);
strncat(str, num, len-1-strlen(str));
sprintf(num,"%d,",greenMax);
strncat(str, num, len-1-strlen(str));
sprintf(num,"%d",blueMax);
strncat(str, num, len-1-strlen(str));
strncat(str, " shift ", len-1-strlen(str));
sprintf(num,"%d,",redShift);
strncat(str, num, len-1-strlen(str));
sprintf(num,"%d,",greenShift);
strncat(str, num, len-1-strlen(str));
sprintf(num,"%d",blueShift);
strncat(str, num, len-1-strlen(str));
}
bool PixelFormat::parse(const char* str)
{
char rgbbgr[4];
int bits1, bits2, bits3;
if (sscanf(str, "%3s%1d%1d%1d", rgbbgr, &bits1, &bits2, &bits3) < 4)
return false;
depth = bits1 + bits2 + bits3;
bpp = depth <= 8 ? 8 : ((depth <= 16) ? 16 : 32);
trueColour = true;
rdr::U32 endianTest = 1;
bigEndian = (*(rdr::U8*)&endianTest == 0);
greenShift = bits3;
greenMax = (1 << bits2) - 1;
if (strcasecmp(rgbbgr, "bgr") == 0) {
redShift = 0;
redMax = (1 << bits3) - 1;
blueShift = bits3 + bits2;
blueMax = (1 << bits1) - 1;
} else if (strcasecmp(rgbbgr, "rgb") == 0) {
blueShift = 0;
blueMax = (1 << bits3) - 1;
redShift = bits3 + bits2;
redMax = (1 << bits1) - 1;
} else {
return false;
}
return true;
}
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