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|
/* Copyright (C) 2000-2003 Constantin Kaplinsky. 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.
*/
//
// tightEncode.h - Tight encoding function.
//
// This file is #included after having set the following macros:
// BPP - 8, 16 or 32
// EXTRA_ARGS - optional extra arguments
// GET_IMAGE_INTO_BUF - gets a rectangle of pixel data into a buffer
//
#include <rdr/OutStream.h>
#include <rdr/ZlibOutStream.h>
#include <assert.h>
namespace rfb {
// CONCAT2E concatenates its arguments, expanding them if they are macros
#ifndef CONCAT2E
#define CONCAT2(a,b) a##b
#define CONCAT2E(a,b) CONCAT2(a,b)
#endif
#define PIXEL_T rdr::CONCAT2E(U,BPP)
#define WRITE_PIXEL CONCAT2E(writeOpaque,BPP)
#define TIGHT_ENCODE CONCAT2E(tightEncode,BPP)
#define SWAP_PIXEL CONCAT2E(SWAP,BPP)
#define HASH_FUNCTION CONCAT2E(HASH_FUNC,BPP)
#define PACK_PIXELS CONCAT2E(packPixels,BPP)
#define DETECT_SMOOTH_IMAGE CONCAT2E(detectSmoothImage,BPP)
#define ENCODE_SOLID_RECT CONCAT2E(encodeSolidRect,BPP)
#define ENCODE_FULLCOLOR_RECT CONCAT2E(encodeFullColorRect,BPP)
#define ENCODE_MONO_RECT CONCAT2E(encodeMonoRect,BPP)
#define ENCODE_INDEXED_RECT CONCAT2E(encodeIndexedRect,BPP)
#define PREPARE_JPEG_ROW CONCAT2E(prepareJpegRow,BPP)
#define ENCODE_JPEG_RECT CONCAT2E(encodeJpegRect,BPP)
#define FILL_PALETTE CONCAT2E(fillPalette,BPP)
#ifndef TIGHT_ONCE
#define TIGHT_ONCE
//
// C-style structures to store palette entries and compression paramentes.
// Such code probably should be converted into C++ classes.
//
struct TIGHT_COLOR_LIST {
TIGHT_COLOR_LIST *next;
int idx;
rdr::U32 rgb;
};
struct TIGHT_PALETTE_ENTRY {
TIGHT_COLOR_LIST *listNode;
int numPixels;
};
struct TIGHT_PALETTE {
TIGHT_PALETTE_ENTRY entry[256];
TIGHT_COLOR_LIST *hash[256];
TIGHT_COLOR_LIST list[256];
};
// FIXME: Is it really a good idea to use static variables for this?
static bool s_pack24; // use 24-bit packing for 32-bit pixels
// FIXME: Make a separate class for palette operations.
static int s_palMaxColors, s_palNumColors;
static rdr::U32 s_monoBackground, s_monoForeground;
static TIGHT_PALETTE s_palette;
//
// Swapping bytes in pixels.
// FIXME: Use a sort of ImageGetter that does not convert pixel format?
//
#ifndef SWAP16
#define SWAP16(n) ((((n) & 0xff) << 8) | (((n) >> 8) & 0xff))
#endif
#ifndef SWAP32
#define SWAP32(n) (((n) >> 24) | (((n) & 0x00ff0000) >> 8) | \
(((n) & 0x0000ff00) << 8) | ((n) << 24))
#endif
//
// Functions to operate on palette structures.
//
#define HASH_FUNC16(rgb) ((int)(((rgb >> 8) + rgb) & 0xFF))
#define HASH_FUNC32(rgb) ((int)(((rgb >> 16) + (rgb >> 8)) & 0xFF))
static void paletteReset(void)
{
s_palNumColors = 0;
memset(s_palette.hash, 0, 256 * sizeof(TIGHT_COLOR_LIST *));
}
static int paletteInsert(rdr::U32 rgb, int numPixels, int bpp)
{
TIGHT_COLOR_LIST *pnode;
TIGHT_COLOR_LIST *prev_pnode = NULL;
int hash_key, idx, new_idx, count;
hash_key = (bpp == 16) ? HASH_FUNC16(rgb) : HASH_FUNC32(rgb);
pnode = s_palette.hash[hash_key];
while (pnode != NULL) {
if (pnode->rgb == rgb) {
// Such palette entry already exists.
new_idx = idx = pnode->idx;
count = s_palette.entry[idx].numPixels + numPixels;
if (new_idx && s_palette.entry[new_idx-1].numPixels < count) {
do {
s_palette.entry[new_idx] = s_palette.entry[new_idx-1];
s_palette.entry[new_idx].listNode->idx = new_idx;
new_idx--;
}
while (new_idx &&
s_palette.entry[new_idx-1].numPixels < count);
s_palette.entry[new_idx].listNode = pnode;
pnode->idx = new_idx;
}
s_palette.entry[new_idx].numPixels = count;
return s_palNumColors;
}
prev_pnode = pnode;
pnode = pnode->next;
}
// Check if palette is full.
if ( s_palNumColors == 256 || s_palNumColors == s_palMaxColors ) {
s_palNumColors = 0;
return 0;
}
// Move palette entries with lesser pixel counts.
for ( idx = s_palNumColors;
idx > 0 && s_palette.entry[idx-1].numPixels < numPixels;
idx-- ) {
s_palette.entry[idx] = s_palette.entry[idx-1];
s_palette.entry[idx].listNode->idx = idx;
}
// Add new palette entry into the freed slot.
pnode = &s_palette.list[s_palNumColors];
if (prev_pnode != NULL) {
prev_pnode->next = pnode;
} else {
s_palette.hash[hash_key] = pnode;
}
pnode->next = NULL;
pnode->idx = idx;
pnode->rgb = rgb;
s_palette.entry[idx].listNode = pnode;
s_palette.entry[idx].numPixels = numPixels;
return (++s_palNumColors);
}
//
// Compress the data (but do not perform actual compression if the data
// size is less than TIGHT_MIN_TO_COMPRESS bytes.
//
static void compressData(rdr::OutStream *os, rdr::ZlibOutStream *zos,
const void *buf, unsigned int length, int zlibLevel)
{
if (length < TIGHT_MIN_TO_COMPRESS) {
os->writeBytes(buf, length);
} else {
// FIXME: Using a temporary MemOutStream may be not efficient.
// Maybe use the same static object used in the JPEG coder?
rdr::MemOutStream mem_os;
zos->setUnderlying(&mem_os);
zos->setCompressionLevel(zlibLevel);
zos->writeBytes(buf, length);
zos->flush();
os->writeCompactLength(mem_os.length());
os->writeBytes(mem_os.data(), mem_os.length());
}
}
//
// Destination manager implementation for the JPEG library.
// FIXME: Implement JPEG compression in new rdr::JpegOutStream class.
//
// FIXME: Keeping a MemOutStream instance may consume too much space.
rdr::MemOutStream s_jpeg_os;
static struct jpeg_destination_mgr s_jpegDstManager;
static JOCTET *s_jpegDstBuffer;
static size_t s_jpegDstBufferLen;
static void
JpegInitDestination(j_compress_ptr cinfo)
{
s_jpeg_os.clear();
s_jpegDstManager.next_output_byte = s_jpegDstBuffer;
s_jpegDstManager.free_in_buffer = s_jpegDstBufferLen;
}
static boolean
JpegEmptyOutputBuffer(j_compress_ptr cinfo)
{
s_jpeg_os.writeBytes(s_jpegDstBuffer, s_jpegDstBufferLen);
s_jpegDstManager.next_output_byte = s_jpegDstBuffer;
s_jpegDstManager.free_in_buffer = s_jpegDstBufferLen;
return TRUE;
}
static void
JpegTermDestination(j_compress_ptr cinfo)
{
int dataLen = s_jpegDstBufferLen - s_jpegDstManager.free_in_buffer;
s_jpeg_os.writeBytes(s_jpegDstBuffer, dataLen);
}
static void
JpegSetDstManager(j_compress_ptr cinfo, JOCTET *buf, size_t buflen)
{
s_jpegDstBuffer = buf;
s_jpegDstBufferLen = buflen;
s_jpegDstManager.init_destination = JpegInitDestination;
s_jpegDstManager.empty_output_buffer = JpegEmptyOutputBuffer;
s_jpegDstManager.term_destination = JpegTermDestination;
cinfo->dest = &s_jpegDstManager;
}
#endif // #ifndef TIGHT_ONCE
static void ENCODE_SOLID_RECT (rdr::OutStream *os,
PIXEL_T *buf, const PixelFormat& pf);
static void ENCODE_FULLCOLOR_RECT (rdr::OutStream *os, rdr::ZlibOutStream zos[4],
PIXEL_T *buf, const PixelFormat& pf, const Rect& r);
static void ENCODE_MONO_RECT (rdr::OutStream *os, rdr::ZlibOutStream zos[4],
PIXEL_T *buf, const PixelFormat& pf, const Rect& r);
#if (BPP != 8)
static void ENCODE_INDEXED_RECT (rdr::OutStream *os, rdr::ZlibOutStream zos[4],
PIXEL_T *buf, const PixelFormat& pf, const Rect& r);
static void ENCODE_JPEG_RECT (rdr::OutStream *os,
PIXEL_T *buf, const PixelFormat& pf, const Rect& r);
#endif
static void FILL_PALETTE (PIXEL_T *data, int count);
//
// Convert 32-bit color samples into 24-bit colors, in place.
// Performs packing only when redMax, greenMax and blueMax are all 255.
// Color components are assumed to be byte-aligned.
//
static inline unsigned int PACK_PIXELS (PIXEL_T *buf, unsigned int count,
const PixelFormat& pf)
{
#if (BPP != 32)
return count * sizeof(PIXEL_T);
#else
if (!s_pack24)
return count * sizeof(PIXEL_T);
rdr::U32 pix;
rdr::U8 *dst = (rdr::U8 *)buf;
for (unsigned int i = 0; i < count; i++) {
pix = *buf++;
pf.rgbFromPixel(pix, NULL, &dst[0], &dst[1], &dst[2]);
dst += 3;
}
return count * 3;
#endif
}
//
// Function to guess if a given rectangle is suitable for JPEG compression.
// Returns true is it looks like a good data for JPEG, false otherwise.
//
// FIXME: Scan the image and determine is it really good for JPEG.
//
#if (BPP != 8)
static bool DETECT_SMOOTH_IMAGE (PIXEL_T *buf, const Rect& r)
{
if (r.width() < TIGHT_DETECT_MIN_WIDTH ||
r.height() < TIGHT_DETECT_MIN_HEIGHT ||
r.area() < TIGHT_JPEG_MIN_RECT_SIZE ||
s_pjconf == NULL)
return 0;
return 1;
}
#endif
// FIXME: Split rectangles into smaller ones!
// FIXME: Compare encoder code with 1.3 before the final version.
//
// Main function of the Tight encoder
//
void TIGHT_ENCODE (const Rect& r, rdr::OutStream *os,
rdr::ZlibOutStream zos[4], void* buf, ConnParams* cp
#ifdef EXTRA_ARGS
, EXTRA_ARGS
#endif
)
{
const PixelFormat& pf = cp->pf();
GET_IMAGE_INTO_BUF(r, buf);
PIXEL_T* pixels = (PIXEL_T*)buf;
#if (BPP == 32)
// Check if it's necessary to pack 24-bit pixels, and
// compute appropriate shift values if necessary.
s_pack24 = pf.is888();
#endif
s_palMaxColors = r.area() / s_pconf->idxMaxColorsDivisor;
if (s_palMaxColors < 2 && r.area() >= s_pconf->monoMinRectSize) {
s_palMaxColors = 2;
}
// FIXME: Temporary limitation for switching to JPEG earlier.
if (s_palMaxColors > 96 && s_pjconf != NULL) {
s_palMaxColors = 96;
}
FILL_PALETTE(pixels, r.area());
switch (s_palNumColors) {
case 0:
// Truecolor image
#if (BPP != 8)
if (s_pjconf != NULL && DETECT_SMOOTH_IMAGE(pixels, r)) {
ENCODE_JPEG_RECT(os, pixels, pf, r);
break;
}
#endif
ENCODE_FULLCOLOR_RECT(os, zos, pixels, pf, r);
break;
case 1:
// Solid rectangle
ENCODE_SOLID_RECT(os, pixels, pf);
break;
case 2:
// Two-color rectangle
ENCODE_MONO_RECT(os, zos, pixels, pf, r);
break;
#if (BPP != 8)
default:
// Up to 256 different colors
ENCODE_INDEXED_RECT(os, zos, pixels, pf, r);
#endif
}
}
//
// Subencoding implementations.
//
static void ENCODE_SOLID_RECT (rdr::OutStream *os, PIXEL_T *buf, const PixelFormat& pf)
{
os->writeU8(0x08 << 4);
int length = PACK_PIXELS(buf, 1, pf);
os->writeBytes(buf, length);
}
static void ENCODE_FULLCOLOR_RECT (rdr::OutStream *os, rdr::ZlibOutStream zos[4],
PIXEL_T *buf, const PixelFormat& pf, const Rect& r)
{
const int streamId = 0;
os->writeU8(streamId << 4);
int length = PACK_PIXELS(buf, r.area(), pf);
compressData(os, &zos[streamId], buf, length, s_pconf->rawZlibLevel);
}
static void ENCODE_MONO_RECT (rdr::OutStream *os, rdr::ZlibOutStream zos[4],
PIXEL_T *buf, const PixelFormat& pf, const Rect& r)
{
const int streamId = 1;
os->writeU8((streamId | 0x04) << 4);
os->writeU8(0x01);
// Write the palette
PIXEL_T pal[2] = { (PIXEL_T)s_monoBackground, (PIXEL_T)s_monoForeground };
os->writeU8(1);
os->writeBytes(pal, PACK_PIXELS(pal, 2, pf));
// Encode the data in-place
PIXEL_T *src = buf;
rdr::U8 *dst = (rdr::U8 *)buf;
int w = r.width();
int h = r.height();
PIXEL_T bg;
unsigned int value, mask;
int aligned_width;
int x, y, bg_bits;
bg = (PIXEL_T) s_monoBackground;
aligned_width = w - w % 8;
for (y = 0; y < h; y++) {
for (x = 0; x < aligned_width; x += 8) {
for (bg_bits = 0; bg_bits < 8; bg_bits++) {
if (*src++ != bg)
break;
}
if (bg_bits == 8) {
*dst++ = 0;
continue;
}
mask = 0x80 >> bg_bits;
value = mask;
for (bg_bits++; bg_bits < 8; bg_bits++) {
mask >>= 1;
if (*src++ != bg) {
value |= mask;
}
}
*dst++ = (rdr::U8)value;
}
mask = 0x80;
value = 0;
if (x >= w)
continue;
for (; x < w; x++) {
if (*src++ != bg) {
value |= mask;
}
mask >>= 1;
}
*dst++ = (rdr::U8)value;
}
// Write the data
int length = (w + 7) / 8;
length *= h;
compressData(os, &zos[streamId], buf, length, s_pconf->monoZlibLevel);
}
#if (BPP != 8)
static void ENCODE_INDEXED_RECT (rdr::OutStream *os, rdr::ZlibOutStream zos[4],
PIXEL_T *buf, const PixelFormat& pf, const Rect& r)
{
const int streamId = 2;
os->writeU8((streamId | 0x04) << 4);
os->writeU8(0x01);
// Write the palette
{
PIXEL_T pal[256];
for (int i = 0; i < s_palNumColors; i++)
pal[i] = (PIXEL_T)s_palette.entry[i].listNode->rgb;
os->writeU8((rdr::U8)(s_palNumColors - 1));
os->writeBytes(pal, PACK_PIXELS(pal, s_palNumColors, pf));
}
// Encode data in-place
PIXEL_T *src = buf;
rdr::U8 *dst = (rdr::U8 *)buf;
int count = r.area();
PIXEL_T rgb;
TIGHT_COLOR_LIST *pnode;
int rep = 0;
while (count--) {
rgb = *src++;
while (count && *src == rgb) {
rep++, src++, count--;
}
pnode = s_palette.hash[HASH_FUNCTION(rgb)];
while (pnode != NULL) {
if ((PIXEL_T)pnode->rgb == rgb) {
*dst++ = (rdr::U8)pnode->idx;
while (rep) {
*dst++ = (rdr::U8)pnode->idx;
rep--;
}
break;
}
pnode = pnode->next;
}
}
// Write the data
compressData(os, &zos[streamId], buf, r.area(), s_pconf->idxZlibLevel);
}
#endif // #if (BPP != 8)
//
// JPEG compression.
//
#if (BPP != 8)
static void ENCODE_JPEG_RECT (rdr::OutStream *os, PIXEL_T *buf,
const PixelFormat& pf, const Rect& r)
{
int w = r.width();
int h = r.height();
struct jpeg_compress_struct cinfo;
struct jpeg_error_mgr jerr;
// FIXME: Make srcBuf[] and/or dstBuf[] static?
rdr::U8 *srcBuf = new rdr::U8[w * 3];
JSAMPROW rowPointer[1];
rowPointer[0] = (JSAMPROW)srcBuf;
cinfo.err = jpeg_std_error(&jerr);
jpeg_create_compress(&cinfo);
cinfo.image_width = w;
cinfo.image_height = h;
cinfo.input_components = 3;
cinfo.in_color_space = JCS_RGB;
jpeg_set_defaults(&cinfo);
jpeg_set_quality(&cinfo, s_pjconf->jpegQuality, TRUE);
rdr::U8 *dstBuf = new rdr::U8[2048];
JpegSetDstManager(&cinfo, dstBuf, 2048);
jpeg_start_compress(&cinfo, TRUE);
for (int dy = 0; dy < h; dy++) {
pf.rgbFromBuffer(srcBuf, (const rdr::U8 *)(&buf[dy * w]), w);
jpeg_write_scanlines(&cinfo, rowPointer, 1);
}
jpeg_finish_compress(&cinfo);
jpeg_destroy_compress(&cinfo);
delete[] srcBuf;
delete[] dstBuf;
os->writeU8(0x09 << 4);
os->writeCompactLength(s_jpeg_os.length());
os->writeBytes(s_jpeg_os.data(), s_jpeg_os.length());
}
#endif // #if (BPP != 8)
//
// Determine the number of colors in the rectangle, and fill in the palette.
//
#if (BPP == 8)
static void FILL_PALETTE (PIXEL_T *data, int count)
{
PIXEL_T c0, c1;
int i, n0, n1;
s_palNumColors = 0;
c0 = data[0];
for (i = 1; i < count && data[i] == c0; i++);
if (i == count) {
s_palNumColors = 1;
return; // Solid rectangle
}
if (s_palMaxColors < 2)
return;
n0 = i;
c1 = data[i];
n1 = 0;
for (i++; i < count; i++) {
if (data[i] == c0) {
n0++;
} else if (data[i] == c1) {
n1++;
} else
break;
}
if (i == count) {
if (n0 > n1) {
s_monoBackground = (rdr::U32)c0;
s_monoForeground = (rdr::U32)c1;
} else {
s_monoBackground = (rdr::U32)c1;
s_monoForeground = (rdr::U32)c0;
}
s_palNumColors = 2; // Two colors
}
}
#else // (BPP != 8)
static void FILL_PALETTE (PIXEL_T *data, int count)
{
PIXEL_T c0, c1, ci = 0;
int i, n0, n1, ni;
c0 = data[0];
for (i = 1; i < count && data[i] == c0; i++);
if (i >= count) {
s_palNumColors = 1; // Solid rectangle
return;
}
if (s_palMaxColors < 2) {
s_palNumColors = 0; // Full-color format preferred
return;
}
n0 = i;
c1 = data[i];
n1 = 0;
for (i++; i < count; i++) {
ci = data[i];
if (ci == c0) {
n0++;
} else if (ci == c1) {
n1++;
} else
break;
}
if (i >= count) {
if (n0 > n1) {
s_monoBackground = (rdr::U32)c0;
s_monoForeground = (rdr::U32)c1;
} else {
s_monoBackground = (rdr::U32)c1;
s_monoForeground = (rdr::U32)c0;
}
s_palNumColors = 2; // Two colors
return;
}
paletteReset();
paletteInsert (c0, (rdr::U32)n0, BPP);
paletteInsert (c1, (rdr::U32)n1, BPP);
ni = 1;
for (i++; i < count; i++) {
if (data[i] == ci) {
ni++;
} else {
if (!paletteInsert (ci, (rdr::U32)ni, BPP))
return;
ci = data[i];
ni = 1;
}
}
paletteInsert (ci, (rdr::U32)ni, BPP);
}
#endif // #if (BPP == 8)
#undef PIXEL_T
#undef WRITE_PIXEL
#undef TIGHT_ENCODE
#undef SWAP_PIXEL
#undef HASH_FUNCTION
#undef PACK_PIXELS
#undef DETECT_SMOOTH_IMAGE
#undef ENCODE_SOLID_RECT
#undef ENCODE_FULLCOLOR_RECT
#undef ENCODE_MONO_RECT
#undef ENCODE_INDEXED_RECT
#undef PREPARE_JPEG_ROW
#undef ENCODE_JPEG_RECT
#undef FILL_PALETTE
}
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