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qct2png.cpp
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qct2png.cpp
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/* > qct.cpp
* 1.02 arb Tue Jun 22 04:38:55 BST 2010 - Fix huffman bug.
* 1.01 arb Mon May 24 21:56:04 BST 2010 - Fix bug reporting outline extent
* 1.00 arb Sun May 23 23:46:28 BST 2010
*/
static const char SCCSid[] = "@(#)qct.c 1.02 (C) 2010 arb Convert QCT map to PNG";
/*
* Byte order
*/
#if defined( SUNOS ) || defined( SOLARIS ) || defined( SUN4 ) || defined( solaris ) || defined( sun4 ) || defined( sun )
#include <sys/isa_defs.h>
#elif defined( MSDOS ) || defined( WIN32 )
#define _LITTLE_ENDIAN
#elif defined ( linux )
#include <endian.h>
# if __BYTE_ORDER == __LITTLE_ENDIAN
# define _LITTLE_ENDIAN
# else
# define _BIG_ENDIAN
# endif
#elif defined ( __CYGWIN__ )
#define _LITTLE_ENDIAN
#else
#error Unknown byte sex
#endif
/*
* 64-bit file I/O
* Not specifically needed for the QCT decoder since it uses 32-bit
* file offsets inside the file so can't be more than 2GB anyway.
*/
#ifdef unix
#define HAS_FOPEN64
#endif
#ifdef HAS_FOPEN64
# ifndef _LARGEFILE64_SOURCE
# define _LARGEFILE64_SOURCE // see lf64 manual
# endif
# define FOPEN fopen64
# define FSEEKO fseeko64
# define FTELLO ftello64
# define OFF_T off64_t
#else
# define FOPEN fopen
# define FSEEKO fseeko
# define FTELLO ftello
# define OFF_T off_t
#endif
/*
* Get command-line options
*/
#ifndef GETOPT
#include <getopt.h>
#define GETOPT(c, options) c = optind = 1; while (c && ((c=getopt(argc,argv,options))!=-1)) switch(c)
#endif /*GETOPT*/
#ifndef GETOPT_LOOP_REST
#define GETOPT_LOOP_REST(argp) \
while((optind < argc)? (argp = argv[optind++]): (argp = NULL))
#endif
/*
* Includes
*/
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h> // for strerror
#include <time.h> // for ctime
#include <math.h> // for log2
#include <errno.h> // for errno
#ifdef USE_GIFLIB
#include "gif/gif.h"
#endif
#ifdef USE_PNG
#include <png.h>
#endif
#ifdef USE_TIFF
#endif
// QCT file format
// as documented in:
// The_Quick_Chart_File_Format_Specification_1.01.pdf
// All words are little-endian
// Header: 24 words
// Georef: 40 doubles
// Palette: 256 words of RGB where blue is LSByte
// Interp: 128x128 bytes
// Index: w*h words
// Data... tiles are 64x64 pixels
#define QCT_MAGIC 0x1423D5FF
#define QCT_TILE_SIZE 64
#define QCT_TILE_PIXELS (QCT_TILE_SIZE*QCT_TILE_SIZE)
// RGB stored packed in an int, Blue is LSB
#define PAL_RED(c) ((c>>16)&255)
#define PAL_GREEN(c) ((c>>8)&255)
#define PAL_BLUE(c) ((c)&255)
/* -------------------------------------------------------------------------
* Generic little-endian file-reading
*/
int
readInt(FILE *fp)
{
int vv;
vv = fgetc(fp);
vv |= (fgetc(fp) << 8);
vv |= (fgetc(fp) << 16);
vv |= (fgetc(fp) << 24);
if (feof(fp)) return(-1);
return(vv);
}
double
readDouble(FILE *fp)
{
double dd;
unsigned char *pp = (unsigned char*)ⅆ
#ifdef _LITTLE_ENDIAN
pp[0] = fgetc(fp);
pp[1] = fgetc(fp);
pp[2] = fgetc(fp);
pp[3] = fgetc(fp);
pp[4] = fgetc(fp);
pp[5] = fgetc(fp);
pp[6] = fgetc(fp);
pp[7] = fgetc(fp);
#else
pp[7] = fgetc(fp);
pp[6] = fgetc(fp);
pp[5] = fgetc(fp);
pp[4] = fgetc(fp);
pp[3] = fgetc(fp);
pp[2] = fgetc(fp);
pp[1] = fgetc(fp);
pp[0] = fgetc(fp);
#endif
return(dd);
}
/* -------------------------------------------------------------------------
* Returns a string (nul-terminated) allocated from malloc
* obtained by reading an index pointer then following it
* by seeking into the file. NB. file pointer upon return
* will be after the index pointer not after the string.
* If index pointer is nul then an empty string is returned
* (rather than a null pointer).
*/
char *
readString(FILE *fp)
{
OFF_T current_offset, string_offset;
int ii;
char *string;
int string_length = 0, buf_length = 1024;
string = (char*)malloc(buf_length);
ii = readInt(fp);
if (ii == 0)
return(strdup(""));
current_offset = FTELLO(fp);
string_offset = ii; // yes, offsets are limited to 32-bits :-(
FSEEKO(fp, string_offset, SEEK_SET);
while (1)
{
ii = fgetc(fp);
string[string_length] = ii;
if (ii == 0)
break;
string_length++;
if (string_length > buf_length)
{
buf_length += 1024;
string = (char*)realloc(string, buf_length);
}
}
string = (char*)realloc(string, string_length+1);
FSEEKO(fp, current_offset, SEEK_SET);
return(string);
}
/* -------------------------------------------------------------------------
*/
int
bits_per_pixel(int num_colours)
{
return (int)(log2(num_colours)+0.999);
/* Alrernatively: */
if (num_colours <= 2) return 1;
if (num_colours <= 4) return 2;
if (num_colours <= 8) return 3;
if (num_colours <= 16) return 4;
if (num_colours <= 32) return 5;
if (num_colours <= 64) return 6;
if (num_colours <= 128) return 7;
}
/* -------------------------------------------------------------------------
* Class to read a QCT map image.
*/
class QCT
{
public:
QCT();
~QCT();
protected:
void throwError(const char *fmt, ...);
void message(const char *fmt, ...);
void debugmsg(const char *fmt, ...);
void readTile(FILE *, int tile_x, int tile_y);
int xy_to_latlon(int pixel_x, int pixel_y, double *lat, double *lon);
public:
void setDebug(int d) { debug = d; }
void setVerbose(int v) { verbose = v; }
bool readFile(FILE *, int headeronly);
bool readFilename(const char *filename, int headeronly);
void printMetadata(FILE *fp);
bool writePPMFile(FILE *);
bool writePPMFilename(const char *filename);
bool writeGIFFile(FILE *);
bool writeGIFFilename(const char *filename);
bool writePNGFile(FILE *);
bool writePNGFilename(const char *filename);
bool writeTIFFFile(FILE *);
bool writeTIFFFilename(const char *filename);
private:
int width, height; // size in tiles (of 64x64 each)
int palette[256]; // combined RGB in each int
unsigned char *image_data; // one pixel per byte
// Metadata
struct
{
int version;
char *title, *name, *ident, *edition, *revision;
char *keywords, *copyright, *scale, *datum;
char *depths, *heights, *projection;
int flags;
char *origfilename;
int origfilesize;
time_t origfiletime;
int unknown1;
char *maptype, *diskname;
int unknown2, unknown3, unknown4, unknown5, unknown6;
} metadata;
// Outline
int num_outline;
double *outline_lat, *outline_lon;
// Georeferencing coefficients
double eas, easY, easX, easYY, easXY, easXX, easYYY, easYYX, easYXX, easXXX;
double nor, norY, norX, norYY, norXY, norXX, norYYY, norYYX, norYXX, norXXX;
double lat, latX, latY, latXX, latXY, latYY, latXXX, latXXY, latXYY, latYYY;
double lon, lonX, lonY, lonXX, lonXY, lonYY, lonXXX, lonXXY, lonXYY, lonYYY;
double datum_shift_north, datum_shift_east;
// Program options
int verbose, debug, debug_kml_outline, debug_kml_boundary;
FILE *dfp; // debug output goes here
};
/* -------------------------------------------------------------------------
*/
QCT::QCT()
{
width = height = 0;
image_data = NULL;
// Metadata
metadata.title = metadata.name = metadata.ident = metadata.edition = metadata.revision = NULL;
metadata.keywords = metadata.copyright = metadata.scale = metadata.datum = NULL;
metadata.depths = metadata.heights = metadata.projection = NULL;
metadata.origfilename = NULL;
metadata.maptype = metadata.diskname = NULL;
// Outline
num_outline = 0;
outline_lat = outline_lon = NULL;
// Program options
verbose = debug = debug_kml_outline = debug_kml_boundary = 0;
dfp = stdout;
}
QCT::~QCT()
{
// Image data
if (image_data) free(image_data);
// Metadata
if (metadata.title) free(metadata.title);
if (metadata.name) free(metadata.name);
if (metadata.ident) free(metadata.ident);
if (metadata.edition) free(metadata.edition);
if (metadata.revision) free(metadata.revision);
if (metadata.keywords) free(metadata.keywords);
if (metadata.copyright) free(metadata.copyright);
if (metadata.scale) free(metadata.scale);
if (metadata.datum) free(metadata.datum);
if (metadata.depths) free(metadata.depths);
if (metadata.heights) free(metadata.heights);
if (metadata.projection) free(metadata.projection);
if (metadata.origfilename) free(metadata.origfilename);
if (metadata.maptype) free(metadata.maptype);
if (metadata.diskname) free(metadata.diskname);
// Map outline
if (outline_lat) free(outline_lat);
if (outline_lon) free(outline_lon);
}
/* -------------------------------------------------------------------------
*/
void
QCT::throwError(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
fprintf(stderr, "\n");
va_end(ap);
}
void
QCT::message(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
if (dfp && (debug|verbose))
{
vfprintf(dfp, fmt, ap);
fprintf(dfp, "\n");
}
va_end(ap);
}
void
QCT::debugmsg(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
if (debug)
{
vfprintf(stderr, fmt, ap);
fprintf(stderr, "\n");
}
va_end(ap);
}
/* -------------------------------------------------------------------------
*/
void
QCT::readTile(FILE *fp, int tile_xx, int tile_yy)
{
unsigned char tile_data[QCT_TILE_PIXELS];
unsigned char *row_ptr[QCT_TILE_SIZE];
int packing;
int row, bytes_per_row;
int pixelnum = 0;
int ii;
// Rows are interleaved in this order (reverse binary)
static int row_seq[] =
{
0, 32, 16, 48, 8, 40, 24, 56, 4, 36, 20, 52, 12, 44, 28, 60, 2,
34, 18, 50, 10, 42, 26, 58, 6, 38, 22, 54, 14, 46, 30, 62, 1,
33, 17, 49, 9, 41, 25, 57, 5, 37, 21, 53, 13, 45, 29, 61, 3, 35,
19, 51, 11, 43, 27, 59, 7, 39, 23, 55, 15, 47, 31, 63
};
debugmsg("Tile %d, %d starts at file offset 0x%x", tile_xx, tile_yy, FTELLO(fp));
// Determine which method was used to pack this tile
packing = fgetc(fp);
debugmsg("Reading tile %d, %d; packed using %s", tile_xx, tile_yy, ((packing==0||packing==255)?"huffman":(packing>127?"pixel":"RLE")));
memset(tile_data, 0, QCT_TILE_PIXELS);
// Size for one whole row in image_data
bytes_per_row = width * QCT_TILE_SIZE;
// Calculate pointer into image_data for each row in this tile
for (row=0; row<QCT_TILE_SIZE; row++)
{
// Top left corner of tile within image
row_ptr[row] = image_data + (tile_yy * QCT_TILE_SIZE * bytes_per_row) + (tile_xx * QCT_TILE_SIZE);
// Interleaved rows in the above sequence
row_ptr[row] += row_seq[row] * bytes_per_row;
}
// Uncompress each row
if (packing == 0 || packing == 255)
{
// Huffman
//debugmsg("Huffman");
int huff_size = 256;
unsigned char *huff = (unsigned char *)malloc(huff_size);
unsigned char *huff_ptr = huff;
int huff_idx = 0;
int num_colours = 0;
int num_branches = 0;
while (num_colours <= num_branches)
{
huff[huff_idx] = getc(fp);
// Relative jump further than 128 needs two more bytes
if (huff[huff_idx] == 128)
{
huff[++huff_idx] = getc(fp);
huff[++huff_idx] = getc(fp);
num_branches++;
}
// Relative jump nearer is encoded directly
else if (huff[huff_idx] > 128)
{
// Count number of branches so we know when tree is built
num_branches++;
}
// Otherwise it's a colour index into the palette
else
{
// Count number of colours so we know when tree is built
num_colours++;
}
huff_idx++;
// Make space when Huffman table runs out of space
if (huff_idx > huff_size)
{
huff_size += 256;
huff = (unsigned char*)realloc(huff, huff_size);
}
}
// If only 1 colour then tile is solid colour so no data follows
if (num_colours == 1)
{
memset(tile_data, huff[0], QCT_TILE_PIXELS);
}
else
{
// Validate Huffman table by ensuring all branches are within table
// (if not just return so tile will be not be unpacked, ie. blank)
{
int ii, delta;
for (ii=0; ii<huff_idx; ii++)
{
if (huff[ii] < 128)
continue;
else if (huff[ii] == 128)
{
if (ii+2 >= huff_idx)
return;
delta = 65537 - (256 * huff[ii+2] + huff[ii+1]) + 2;
if (ii+delta >= huff_idx)
return;
ii += 2;
}
else
{
delta = 257 - huff[ii];
if (ii+delta >= huff_idx)
return;
}
}
}
// Read tile data one bit at a time following branches in Huffman tree
int bits_left = 8;
int bit_value;
ii = fgetc(fp);
while (pixelnum < QCT_TILE_PIXELS)
{
// If entry is a colour then output it
if (*huff_ptr < 128)
{
tile_data[pixelnum++] = *huff_ptr;
// Go back to top of tree for next pixel
huff_ptr = huff;
continue;
}
// Get the next "bit"
bit_value = (ii & 1);
// Prepare for the following one
ii >>= 1;
bits_left--;
if (bits_left == 0)
{
ii = fgetc(fp);
bits_left = 8;
}
// Now check value to see whether to follow branch or not
if (bit_value == 0)
{
// Don't jump just proceed to next entry in Huffman table
if (*huff_ptr == 128) huff_ptr+=2;
huff_ptr++;
}
else
{
// Follow branch to different part of Huffman table
if (*huff_ptr > 128)
{
// Near jump
huff_ptr += 257 - (*huff_ptr);
}
else if (*huff_ptr == 128)
{
// Far jump needs two more bytes
int delta = 65537 - (256 * huff_ptr[2] + huff_ptr[1]) + 2;
huff_ptr += delta;
}
// NB < 128 already handled above
}
}
}
}
else if (packing > 127)
{
// Pixel packing
int num_sub_colours = 256 - packing;
int shift = bits_per_pixel(num_sub_colours);
int mask = (1 << shift) - 1;
int num_pixels_per_word = 32 / shift;
int palette_index[256];
debugmsg("PACKED: sub-palette size is %d (%d bits)", num_sub_colours, shift);
// Read the sub-palette
for (ii=0; ii<num_sub_colours; ii++)
{
palette_index[ii] = fgetc(fp);
debugmsg("PACKED: palette %d = %d", ii, palette_index[ii]);
}
// Read the pixels in 4-byte words and unpack the bits from each
while (pixelnum < QCT_TILE_PIXELS)
{
int colour, runs;
ii = readInt(fp);
for (runs = 0; runs < num_pixels_per_word; runs++)
{
colour = ii & mask;
ii = ii >> shift;
tile_data[pixelnum++] = palette_index[colour];
}
}
}
else
{
// Run-length Encoding
int num_sub_colours = packing;
int num_low_bits = bits_per_pixel(num_sub_colours);
int pal_mask = (1 << num_low_bits)-1;
int palette_index[256];
//debugmsg("RLE: sub-palette size is %d (uses %d bits) mask 0x%x", num_sub_colours, num_low_bits, pal_mask);
for (ii=0; ii<num_sub_colours; ii++)
{
palette_index[ii] = fgetc(fp);
//debugmsg("RLE palette %d = %d", ii, palette_index[ii]);
}
while (pixelnum < QCT_TILE_PIXELS)
{
int colour, runs;
ii = fgetc(fp);
colour = ii & pal_mask;
runs = ii >> num_low_bits;
//debugmsg("RLE value 0x%x is colour %d for %d runs [%d..%d]", ii, colour, runs, pixelnum, pixelnum+runs);
while (runs-- > 0)
{
tile_data[pixelnum++] = palette_index[colour];
}
}
}
// Decommutate the interleaved rows and copy into the image
{
int yy;
for (yy=0; yy<QCT_TILE_SIZE; yy++)
{
memcpy(row_ptr[yy], tile_data+yy*QCT_TILE_SIZE, QCT_TILE_SIZE);
}
}
}
bool
QCT::readFile(FILE *fp, int headeronly)
{
int ii;
// Read Metadata
ii = readInt(fp);
if (ii != QCT_MAGIC)
{
throwError("Not a QCT file (%x != %x)\n",ii,QCT_MAGIC);
return false;
}
metadata.version = readInt(fp);
width = readInt(fp);
height = readInt(fp);
metadata.title = readString(fp);
metadata.name = readString(fp);
metadata.ident = readString(fp);
metadata.edition = readString(fp);
metadata.revision = readString(fp);
metadata.keywords = readString(fp);
metadata.copyright = readString(fp);
metadata.scale = readString(fp);
metadata.datum = readString(fp);
metadata.depths = readString(fp);
metadata.heights = readString(fp);
metadata.projection = readString(fp);
metadata.flags = readInt(fp);
metadata.origfilename = readString(fp);
metadata.origfilesize = readInt(fp);
metadata.origfiletime = readInt(fp);
metadata.unknown1 = readInt(fp);
// Pointer to extended metadata
{
OFF_T current_position, extended_position;
extended_position = readInt(fp);
current_position = FTELLO(fp);
FSEEKO(fp, extended_position, SEEK_SET);
metadata.maptype = readString(fp);
// Pointer to datum shift
{
OFF_T current_position, datum_shift_position;
datum_shift_position = readInt(fp);
current_position = FTELLO(fp);
FSEEKO(fp, datum_shift_position, SEEK_SET);
datum_shift_north = readDouble(fp);
datum_shift_east = readDouble(fp);
FSEEKO(fp, current_position, SEEK_SET);
}
metadata.diskname = readString(fp);
metadata.unknown2 = readInt(fp);
metadata.unknown3 = readInt(fp);
metadata.unknown4 = readInt(fp);
metadata.unknown5 = readInt(fp);
metadata.unknown6 = readInt(fp);
FSEEKO(fp, current_position, SEEK_SET);
}
// Map outline
num_outline = readInt(fp); // number of map outline points
outline_lat = (double*)calloc(num_outline, sizeof(double));
outline_lon = (double*)calloc(num_outline, sizeof(double));
// Pointer to map outline
{
int outline;
OFF_T current_position, outline_position;
outline_position = readInt(fp);
current_position = FTELLO(fp);
FSEEKO(fp, outline_position, SEEK_SET);
for (outline=0; outline<num_outline; outline++)
{
outline_lat[outline] = readDouble(fp);
outline_lon[outline] = readDouble(fp);
}
FSEEKO(fp, current_position, SEEK_SET);
}
// Georeferencing ceofficients
eas = readDouble(fp);
easY = readDouble(fp);
easX = readDouble(fp);
easYY = readDouble(fp);
easXY = readDouble(fp);
easXX = readDouble(fp);
easYYY = readDouble(fp);
easYYX = readDouble(fp);
easYXX = readDouble(fp);
easXXX = readDouble(fp);
nor = readDouble(fp);
norY = readDouble(fp);
norX = readDouble(fp);
norYY = readDouble(fp);
norXY = readDouble(fp);
norXX = readDouble(fp);
norYYY = readDouble(fp);
norYYX = readDouble(fp);
norYXX = readDouble(fp);
norXXX = readDouble(fp);
lat = readDouble(fp);
latX = readDouble(fp);
latY = readDouble(fp);
latXX = readDouble(fp);
latXY = readDouble(fp);
latYY = readDouble(fp);
latXXX = readDouble(fp);
latXXY = readDouble(fp);
latXYY = readDouble(fp);
latYYY = readDouble(fp);
lon = readDouble(fp);
lonX = readDouble(fp);
lonY = readDouble(fp);
lonXX = readDouble(fp);
lonXY = readDouble(fp);
lonYY = readDouble(fp);
lonXXX = readDouble(fp);
lonXXY = readDouble(fp);
lonXYY = readDouble(fp);
lonYYY = readDouble(fp);
// Palette
for (ii=0; ii<256; ii++)
{
palette[ii] = readInt(fp);
}
// Interpolation matrix (128 x 128)
for (ii=0; ii<128*128; ii++)
{
fgetc(fp);
}
// Don't read and unpack image data if not required
if (headeronly)
return true;
// Image index (width * height pointers)
image_data = (unsigned char*)calloc(height*QCT_TILE_SIZE, width*QCT_TILE_SIZE);
{
int xx, yy;
for (yy=0; yy<height; yy++)
{
for (xx=0; xx<width; xx++)
{
OFF_T current_offset, tile_offset;
tile_offset = readInt(fp);
current_offset = FTELLO(fp);
FSEEKO(fp, tile_offset, SEEK_SET);
//debugmsg("Would read tile %d, %d packing %d at offset %x", xx, yy, fgetc(fp), tile_offset);
readTile(fp, xx, yy);
FSEEKO(fp, current_offset, SEEK_SET);
}
}
}
return(true);
}
bool
QCT::readFilename(const char *filename, int headeronly)
{
FILE *fp;
bool truth;
fp = fopen(filename, "rb");
if (fp == NULL)
{
throwError("cannot open %s (%s)", filename, strerror(errno));
return false;
}
truth = readFile(fp, headeronly);
fclose(fp);
return(truth);
}
/* -------------------------------------------------------------------------
*/
void
QCT::printMetadata(FILE *fp)
{
int ii;
dfp = fp;
verbose++;
message("Version %d", metadata.version);
message("Width: %d tiles (%d pixels)", width, width*QCT_TILE_SIZE);
message("Height: %d tiles (%d pixels)", height, height*QCT_TILE_SIZE);
message("Title: %s", metadata.title);
message("Name: %s", metadata.name);
message("Identifier: %s", metadata.ident);
message("Edition: %s", metadata.edition);
message("Revision: %s", metadata.revision);
message("Keywords: %s", metadata.keywords);
message("Copyright: %s", metadata.copyright);
message("Scale: %s", metadata.scale);
message("Datum: %s", metadata.datum);
message("Depths: %s", metadata.depths);
message("Heights: %s", metadata.heights);
message("Projection: %s", metadata.projection);
message("Flags: 0x%x", metadata.flags);
message("OriginalFileName: %s", metadata.origfilename);
message("OriginalFileSize %d bytes", metadata.origfilesize);
message("OriginalFileCreation %s", ctime(&metadata.origfiletime));
message("MapType: %s", metadata.maptype);
message("DiskName: %s", metadata.diskname);
message("Unknown: %d", metadata.unknown1);
message("Unknown: %d", metadata.unknown2);
message("Unknown: %d", metadata.unknown3);
message("Unknown: %d", metadata.unknown4);
message("Unknown: %d", metadata.unknown5);
message("Unknown: %d", metadata.unknown6);
// Palette
for (ii=0; ii<256; ii++)
{
if (palette[ii]) message("Colour %d = %6x", ii, palette[ii]);
}
// Outline
message("OutlinePts: %d", num_outline);
{
double outline_lat_min = 99, outline_lat_max = -99;
double outline_lon_min = 399, outline_lon_max = -399;
FILE *kml = NULL;
if (debug_kml_outline) kml = fopen("outline.kml", "w");
if (kml) fprintf(kml, "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"
"<kml xmlns=\"http://earth.google.com/kml/2.0\">\n"
"<Document>\n"
"<name>Outline</name>\n"
"<description>Outline</description>\n"
"<Style><LineStyle><color>ffffff00</color><width>6</width></LineStyle></Style>\n"
"<Placemark>\n"
"<name>Outline</name>\n"
"<description>Outline</description>\n"
"<LineString>\n"
"<coordinates>");
for (ii=0; ii<num_outline; ii++)
{
message(" %3.9f %3.9f", outline_lat[ii], outline_lon[ii]);
if (kml) fprintf(kml, "%f,%f,%f ", outline_lon[ii], outline_lat[ii], 0.0);
if (outline_lat[ii] > outline_lat_max) outline_lat_max = outline_lat[ii];
if (outline_lat[ii] < outline_lat_min) outline_lat_min = outline_lat[ii];
if (outline_lon[ii] > outline_lon_max) outline_lon_max = outline_lon[ii];
if (outline_lon[ii] < outline_lon_min) outline_lon_min = outline_lon[ii];
}
if (kml)
{
fprintf(kml, "</coordinates>\n</LineString>\n</Placemark>\n</Document>\n</kml>\n");
fclose(kml);
}
message("OutlineLat %f to %f", outline_lat_min, outline_lat_max);
message("OutlineLon %f to %f", outline_lon_min, outline_lon_max);
}
// Georeferencing
message("GeoTopLeftLonLat: %f %f", lon, lat);
message("GeoTopLeftEastNorth: %f %f", eas, nor);
message("DatumShiftEastNorth: %f %f\n", datum_shift_east, datum_shift_north);
// Calculate corner coordinates
{
double lat, lon;
xy_to_latlon(0, 0, &lat, &lon);
message("TL %f, %f", lat, lon);
xy_to_latlon(width*QCT_TILE_SIZE-1, 0, &lat, &lon);
message("TR %f, %f", lat, lon);
xy_to_latlon(0, height*QCT_TILE_SIZE-1, &lat, &lon);
message("BL %f, %f", lat, lon);
xy_to_latlon(width*QCT_TILE_SIZE-1, height*QCT_TILE_SIZE-1, &lat, &lon);
message("BR %f, %f", lat, lon);
}
}
/* -------------------------------------------------------------------------
*/
bool
QCT::writePPMFile(FILE *fp)
{
int xx, yy, colour;
unsigned char *image_ptr = image_data;
// PPM file header (for raw data not ASCII)
fprintf(fp, "P6 %d %d 255\n",
width*QCT_TILE_SIZE,
height*QCT_TILE_SIZE);
// Expand palette to R,G,B for each pixel
for (yy=0; yy<height*QCT_TILE_SIZE; yy++)
{
for (xx=0; xx<width*QCT_TILE_SIZE; xx++)
{
colour = palette[*image_ptr++];
fputc(PAL_RED(colour), fp);
fputc(PAL_GREEN(colour), fp);
fputc(PAL_BLUE(colour), fp);
}
}
if (ferror(fp))
return false;
return(true);
}
bool
QCT::writePPMFilename(const char *filename)
{
FILE *fp;
bool truth;
fp = fopen(filename, "wb");
if (fp == NULL)
{
throwError("cannot open %s (%s)", filename, strerror(errno));
return false;
}
truth = writePPMFile(fp);
if (fclose(fp))
{
throwError("cannot write %s (%s)", filename, strerror(errno));
truth = false;
}
return(truth);
}
/* -------------------------------------------------------------------------
*/
bool
QCT::writeGIFFile(FILE *fp)
{
#ifdef USE_GIFLIB
unsigned char cmap[3][256];
unsigned char *image_data_ptr = image_data;
int background = 0;
int transparent = -1;
int xx, yy;
for (xx=0; xx<256; xx++)
{
cmap[0][xx] = PAL_RED(palette[xx]);
cmap[1][xx] = PAL_GREEN(palette[xx]);
cmap[2][xx] = PAL_BLUE(palette[xx]);
}
gifout_open_file(fp, width*QCT_TILE_SIZE, height*QCT_TILE_SIZE, 256, cmap, background, transparent);
gifout_open_image(0, 0, width*QCT_TILE_SIZE, height*QCT_TILE_SIZE);
for (yy=0; yy<height*QCT_TILE_SIZE; yy++)
{
for (xx=0; xx<width*QCT_TILE_SIZE; xx++)
gifout_put_pixel(*image_data_ptr++);
}
gifout_close_image();
gifout_close_file();
return true;
#else
throwError("cannot write file (GIF not supported)");
return false;
#endif
}
bool
QCT::writeGIFFilename(const char *filename)
{
FILE *fp;
bool truth;
fp = fopen(filename, "wb");
if (fp == NULL)
{
throwError("cannot open %s (%s)", filename, strerror(errno));
return false;
}
truth = writeGIFFile(fp);
if (fclose(fp))
{
throwError("cannot write %s (%s)", filename, strerror(errno));
truth = false;
}
return(truth);
}
/* -------------------------------------------------------------------------
*/
bool
QCT::writePNGFile(FILE *fp)
{