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/**************************************************************************/
/* */
/* Copyright (c) 2001, 2011 NoMachine (http://www.nomachine.com) */
/* Copyright (c) 2008-2017 Oleksandr Shneyder <o.shneyder@phoca-gmbh.de> */
/* Copyright (c) 2014-2022 Ulrich Sibiller <uli42@gmx.de> */
/* Copyright (c) 2014-2019 Mihai Moldovan <ionic@ionic.de> */
/* Copyright (c) 2011-2022 Mike Gabriel <mike.gabriel@das-netzwerkteam.de>*/
/* Copyright (c) 2015-2016 Qindel Group (http://www.qindel.com) */
/* */
/* NXCOMPEXT, NX protocol compression and NX extensions to this software */
/* are copyright of the aforementioned persons and companies. */
/* */
/* Redistribution and use of the present software is allowed according */
/* to terms specified in the file LICENSE which comes in the source */
/* distribution. */
/* */
/* All rights reserved. */
/* */
/* NOTE: This software has received contributions from various other */
/* contributors, only the core maintainers and supporters are listed as */
/* copyright holders. Please contact us, if you feel you should be listed */
/* as copyright holder, as well. */
/* */
/**************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <nx-X11/X.h>
#include <nx-X11/Xlib.h>
#include <nx-X11/Xmd.h>
#include <jpeglib.h>
#include "Compext.h"
#include "Mask.h"
#include "Jpeg.h"
#include "../Utils.h"
#define PANIC
#define WARNING
#undef TEST
#undef DEBUG
#define JPEG_DEST_SIZE(width, height) ((width) * 3 * (height) + 1024)
/*
* Local function prototypes.
*/
static void PrepareRowForJpeg(CARD8 *dst, int y, int count);
static void PrepareRowForJpeg24(CARD8 *dst, int y, int count);
static void PrepareRowForJpeg16(CARD8 *dst, int y, int count);
static void PrepareRowForJpeg32(CARD8 *dst, int y, int count);
static int JpegEmptyOutputBuffer(j_compress_ptr cinfo);
static void JpegInitDestination(j_compress_ptr cinfo);
static void JpegTermDestination(j_compress_ptr cinfo);
static void JpegSetDstManager(j_compress_ptr cinfo);
/*
* Quality levels.
*/
static int jpegQuality[10] = {20, 30, 40, 50, 55, 60, 65, 70, 75, 80};
/*
* Image characteristics.
*/
static int bytesPerLine;
static CARD8 bitsPerPixel;
static CARD16 redMax, greenMax, blueMax;
static CARD8 redShift, greenShift, blueShift;
static int byteOrder;
/*
* Other variables used for the Jpeg
* encoding.
*/
static char *jpegBeforeBuf = NULL;
static char *jpegCompBuf;
static int jpegCompBufSize;
static int jpegError;
static int jpegDstDataLen;
static struct jpeg_destination_mgr jpegDstManager;
/*
* Just for debugging purpose.
*/
#ifdef DEBUG
static int jpegId;
static char jpegName[10];
static FILE *jpegFile;
#endif
/*
* Function declarations
*/
char *JpegCompressData(XImage *image, int level, int *compressed_size)
{
struct jpeg_compress_struct cinfo;
struct jpeg_error_mgr jerr;
CARD8 *srcBuf;
JSAMPROW rowPointer[1];
int dy, w, h;
*compressed_size = 0;
/*
* Initialize the image stuff
*/
bitsPerPixel = image -> bits_per_pixel;
bytesPerLine = image -> bytes_per_line;
byteOrder = image -> byte_order;
#ifdef TEST
fprintf(stderr, "******JpegCompressData: Image byte order [%d] bitmap bit order [%d].\n",
image -> byte_order, image -> bitmap_bit_order);
fprintf(stderr, "******JpegCompressData: Bits per pixel [%d] bytes per line [%d].\n",
bitsPerPixel, bytesPerLine);
#endif
redShift = FindLSB(image -> red_mask) - 1;
greenShift = FindLSB(image -> green_mask) - 1;
blueShift = FindLSB(image -> blue_mask) - 1;
#ifdef TEST
fprintf(stderr, "******JpegCompressData: Red mask [0x%lx] green mask [0x%lx] blue mask [0x%lx].\n",
image -> red_mask, image -> green_mask, image -> blue_mask);
fprintf(stderr, "******JpegCompressData: Red shift [%d] green shift [%d] blue shift [%d].\n",
redShift, greenShift, blueShift);
#endif
redMax = image -> red_mask >> redShift;
greenMax = image -> green_mask >> greenShift;
blueMax = image -> blue_mask >> blueShift;
#ifdef TEST
fprintf(stderr, "******JpegCompressData: Red max [0x%x] green max [0x%x] blue max [0x%x].\n",
redMax, greenMax, blueMax);
#endif
w = image -> width;
h = image -> height;
jpegBeforeBuf = image -> data;
#ifdef DEBUG
fprintf(stderr, "******JpegCompressData: Width [%d] height [%d] level [%d].\n",
w, h, level);
#endif
if (bitsPerPixel == 1 ||
bitsPerPixel == 8)
{
#ifdef PANIC
fprintf(stderr, "******JpegCompressData: PANIC! Invalid bits per pixel [%d].\n",
bitsPerPixel);
#endif
return NULL;
}
/*
* Allocate space for one line of the
* resulting image, 3 bytes per pixel.
*/
#ifdef DEBUG
fprintf(stderr, "******JpegCompressData: Allocating [%d] bytes for the scanline.\n",
w * 3);
#endif
srcBuf = (CARD8 *) malloc(w * 3);
if (srcBuf == NULL)
{
#ifdef PANIC
fprintf(stderr, "******JpegCompressData: PANIC! Cannot allocate [%d] bytes.\n",
w * 3);
#endif
return NULL;
}
rowPointer[0] = 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, jpegQuality[level], 1);
/*
* Allocate memory for the destination
* buffer.
*/
jpegCompBufSize = JPEG_DEST_SIZE(w, h);
#ifdef TEST
fprintf(stderr, "******JpegCompressData: Allocating [%d] bytes for the destination data.\n",
jpegCompBufSize);
#endif
jpegCompBuf = malloc(jpegCompBufSize);
if (jpegCompBuf == NULL)
{
#ifdef PANIC
fprintf(stderr, "******JpegCompressData: PANIC! Error allocating [%d] bytes for the Jpeg data.\n",
jpegCompBufSize);
#endif
return NULL;
}
JpegSetDstManager(&cinfo);
jpeg_start_compress(&cinfo, 1);
#ifdef DEBUG
fprintf(stderr, "******JpegCompressedData: Initialization finished.\n");
#endif
for (dy = 0; dy < h; dy++)
{
PrepareRowForJpeg(srcBuf, dy, w);
jpeg_write_scanlines(&cinfo, rowPointer, 1);
if (jpegError != 0)
{
break;
}
}
#ifdef DEBUG
fprintf(stderr, "******JpegCompressedData: Compression finished. Lines handled [%d,%d]. Error is [%d].\n",
dy, h, jpegError);
#endif
if (jpegError == 0)
{
jpeg_finish_compress(&cinfo);
}
jpeg_destroy_compress(&cinfo);
free((char *) srcBuf);
if (jpegError != 0)
{
#ifdef PANIC
fprintf(stderr, "******JpegCompressedData: PANIC! Compression failed. Error is [%d].\n",
jpegError);
#endif
SAFE_free(jpegCompBuf);
return NULL;
}
/*
* Check the size of the resulting data.
*/
if (jpegDstDataLen > 0)
{
/*
* Save the image on disk to help with
* the debug.
*/
#ifdef DEBUG
int i = 0;
fprintf(stderr, "******JpegCompressedData: Compressed size [%d].\n",
jpegDstDataLen);
jpegId++;
sprintf(jpegName, "jpeg%d", jpegId);
jpegFile = fopen(jpegName, "w");
for (i = 0; i < jpegDstDataLen; i++)
{
fprintf(jpegFile, "%c", *(jpegCompBuf + i));
}
fclose(jpegFile);
#endif
*compressed_size = jpegDstDataLen;
return jpegCompBuf;
}
else
{
#ifdef PANIC
fprintf(stderr, "******JpegCompressedData: PANIC! Invalid size of the compressed data [%d].\n",
jpegDstDataLen);
#endif
SAFE_free(jpegCompBuf);
return NULL;
}
}
void PrepareRowForJpeg(CARD8 *dst, int y, int count)
{
if (bitsPerPixel == 32)
{
if (redMax == 0xff &&
greenMax == 0xff &&
blueMax == 0xff)
{
PrepareRowForJpeg24(dst, y, count);
}
else
{
PrepareRowForJpeg32(dst, y, count);
}
}
else if (bitsPerPixel == 24)
{
memcpy(dst, jpegBeforeBuf + y * bytesPerLine, count * 3);
}
else
{
/*
* 16 bpp assumed.
*/
PrepareRowForJpeg16(dst, y, count);
}
}
void PrepareRowForJpeg24(CARD8 *dst, int y, int count)
{
CARD8 *fbptr;
CARD32 pix;
fbptr = (CARD8 *) (jpegBeforeBuf + y * bytesPerLine);
while (count--)
{
if (byteOrder == LSBFirst)
{
pix = (CARD32) *(fbptr + 2);
pix = (pix << 8) | (CARD32) *(fbptr+1);
pix = (pix << 8) | (CARD32) *fbptr;
}
else
{
pix = (CARD32) *(fbptr + 1);
pix = (pix << 8) | (CARD32) *(fbptr + 2);
pix = (pix << 8) | (CARD32) *(fbptr + 3);
}
*dst++ = (CARD8)(pix >> redShift);
*dst++ = (CARD8)(pix >> greenShift);
*dst++ = (CARD8)(pix >> blueShift);
fbptr+=4;
}
}
#define DEFINE_JPEG_GET_ROW_FUNCTION(bpp) \
\
void PrepareRowForJpeg##bpp(CARD8 *dst, int y, int count) \
{ \
CARD8 *fbptr; \
CARD##bpp pix; \
int inRed, inGreen, inBlue; \
int i; \
\
fbptr = (CARD8 *) (jpegBeforeBuf + y * bytesPerLine); \
\
while (count--) \
{ \
pix = 0; \
\
if (byteOrder == LSBFirst) \
{ \
for (i = (bpp >> 3) - 1; i >= 0; i--) \
{ \
pix = (pix << 8) | (CARD32) *(fbptr + i); \
} \
} \
else \
{ \
for (i = 0; i < (bpp >> 3); i++) \
{ \
pix = (pix << 8) | (CARD32) *(fbptr + i); \
} \
} \
\
fbptr += bpp >> 3; \
\
inRed = (int) \
(pix >> redShift & redMax); \
inGreen = (int) \
(pix >> greenShift & greenMax); \
inBlue = (int) \
(pix >> blueShift & blueMax); \
\
*dst++ = (CARD8)((inRed * 255 + redMax / 2) / \
redMax); \
*dst++ = (CARD8)((inGreen * 255 + greenMax / 2) / \
greenMax); \
*dst++ = (CARD8)((inBlue * 255 + blueMax / 2) / \
blueMax); \
} \
}
DEFINE_JPEG_GET_ROW_FUNCTION(16)
DEFINE_JPEG_GET_ROW_FUNCTION(32)
/*
* Destination manager implementation for JPEG library.
*/
void JpegInitDestination(j_compress_ptr cinfo)
{
jpegError = 0;
jpegDstManager.next_output_byte = (JOCTET *) jpegCompBuf;
jpegDstManager.free_in_buffer = (size_t) jpegCompBufSize;
}
int JpegEmptyOutputBuffer(j_compress_ptr cinfo)
{
jpegError = 1;
jpegDstManager.next_output_byte = (JOCTET *) jpegCompBuf;
jpegDstManager.free_in_buffer = (size_t) jpegCompBufSize;
return 1;
}
void JpegTermDestination(j_compress_ptr cinfo)
{
jpegDstDataLen = jpegCompBufSize - jpegDstManager.free_in_buffer;
}
void JpegSetDstManager(j_compress_ptr cinfo)
{
jpegDstManager.init_destination = JpegInitDestination;
jpegDstManager.empty_output_buffer = JpegEmptyOutputBuffer;
jpegDstManager.term_destination = JpegTermDestination;
cinfo -> dest = &jpegDstManager;
}
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