/** @file
Parser: @b image parser class.
Copyright (c) 2001-2026 Art. Lebedev Studio (https://www.artlebedev.com)
Authors: Konstantin Morshnev <moko@design.ru>, Alexandr Petrosian <paf@design.ru>
*/
/*
jpegsize: gets the width and height (in pixels) of a jpeg file
Andrew Tong, werdna@ugcs.caltech.edu February 14, 1995
modified slightly by alex@ed.ac.uk
and further still by rjray@uswest.com
optimization and general re-write from tmetro@vl.com
from perl by paf@design.ru
*/
#include "pa_config_includes.h"
#include "gif.h"
#include "pa_vmethod_frame.h"
#include "pa_common.h"
#include "pa_request.h"
#include "pa_vfile.h"
#include "pa_vimage.h"
#include "pa_vdate.h"
#include "pa_table.h"
#include "pa_charsets.h"
volatile const char * IDENT_IMAGE_C="$Id: image.C,v 1.199 2026/04/25 13:38:46 moko Exp $";
// defines
static const String spacebar_width_name("space");
static const String monospace_width_name("width");
static const String letter_spacing_name("spacing");
// class
class MImage: public Methoded {
public: // VStateless_class
Value* create_new_value(Pool&) { return new VImage(); }
public:
MImage();
};
// globals
DECLARE_CLASS_VAR(image, new MImage);
// helpers
#define EXIF_TAG(tag, name) put(tag, #name);
/// value of exif tag -> it's value
class EXIF_tag_value2name: public Hash<int, const char*> {
public:
EXIF_tag_value2name() {
// image JPEG Exif
// Tags used by IFD0 (main image)
EXIF_TAG(0x010e, ImageDescription);
EXIF_TAG(0x010f, Make);
EXIF_TAG(0x0110, Model);
EXIF_TAG(0x0112, Orientation);
EXIF_TAG(0x011a, XResolution);
EXIF_TAG(0x011b, YResolution);
EXIF_TAG(0x0128, ResolutionUnit);
EXIF_TAG(0x0131, Software);
EXIF_TAG(0x0132, DateTime);
EXIF_TAG(0x013e, WhitePoint);
EXIF_TAG(0x013f, PrimaryChromaticities);
EXIF_TAG(0x0211, YCbCrCoefficients);
EXIF_TAG(0x0213, YCbCrPositioning);
EXIF_TAG(0x0214, ReferenceBlackWhite);
EXIF_TAG(0x8298, Copyright);
EXIF_TAG(0x8769, ExifOffset);
// Tags used by Exif SubIFD
EXIF_TAG(0x829a, ExposureTime);
EXIF_TAG(0x829d, FNumber);
EXIF_TAG(0x8822, ExposureProgram);
EXIF_TAG(0x8827, ISOSpeedRatings);
EXIF_TAG(0x9000, ExifVersion);
EXIF_TAG(0x9003, DateTimeOriginal);
EXIF_TAG(0x9004, DateTimeDigitized);
EXIF_TAG(0x9101, ComponentsConfiguration);
EXIF_TAG(0x9102, CompressedBitsPerPixel);
EXIF_TAG(0x9201, ShutterSpeedValue);
EXIF_TAG(0x9202, ApertureValue);
EXIF_TAG(0x9203, BrightnessValue);
EXIF_TAG(0x9204, ExposureBiasValue);
EXIF_TAG(0x9205, MaxApertureValue);
EXIF_TAG(0x9206, SubjectDistance);
EXIF_TAG(0x9207, MeteringMode);
EXIF_TAG(0x9208, LightSource);
EXIF_TAG(0x9209, Flash);
EXIF_TAG(0x920a, FocalLength);
EXIF_TAG(0x927c, MakerNote);
EXIF_TAG(0x9286, UserComment);
EXIF_TAG(0x9290, SubsecTime);
EXIF_TAG(0x9291, SubsecTimeOriginal);
EXIF_TAG(0x9292, SubsecTimeDigitized);
EXIF_TAG(0xa000, FlashPixVersion);
EXIF_TAG(0xa001, ColorSpace);
EXIF_TAG(0xa002, ExifImageWidth);
EXIF_TAG(0xa003, ExifImageHeight);
EXIF_TAG(0xa004, RelatedSoundFile);
EXIF_TAG(0xa005, ExifInteroperabilityOffset);
EXIF_TAG(0xa20e, FocalPlaneXResolution);
EXIF_TAG(0xa20f, FocalPlaneYResolution);
EXIF_TAG(0xa210, FocalPlaneResolutionUnit);
EXIF_TAG(0xa215, ExposureIndex);
EXIF_TAG(0xa217, SensingMethod);
EXIF_TAG(0xa300, FileSource);
EXIF_TAG(0xa301, SceneType);
EXIF_TAG(0xa302, CFAPattern);
// Misc Tags
EXIF_TAG(0x00fe, NewSubfileType);
EXIF_TAG(0x00ff, SubfileType);
EXIF_TAG(0x012d, TransferFunction);
EXIF_TAG(0x013b, Artist);
EXIF_TAG(0x013d, Predictor);
EXIF_TAG(0x0142, TileWidth);
EXIF_TAG(0x0143, TileLength);
EXIF_TAG(0x0144, TileOffsets);
EXIF_TAG(0x0145, TileByteCounts);
EXIF_TAG(0x014a, SubIFDs);
EXIF_TAG(0x015b, JPEGTables);
EXIF_TAG(0x828d, CFARepeatPatternDim);
EXIF_TAG(0x828e, CFAPattern);
EXIF_TAG(0x828f, BatteryLevel);
EXIF_TAG(0x83bb, IPTC/NAA);
EXIF_TAG(0x8773, InterColorProfile);
EXIF_TAG(0x8824, SpectralSensitivity);
//EXIF_TAG(0x8825, GPSInfo);
EXIF_TAG(0x8828, OECF);
EXIF_TAG(0x8829, Interlace);
EXIF_TAG(0x882a, TimeZoneOffset);
EXIF_TAG(0x882b, SelfTimerMode);
EXIF_TAG(0x920b, FlashEnergy);
EXIF_TAG(0x920c, SpatialFrequencyResponse);
EXIF_TAG(0x920d, Noise);
EXIF_TAG(0x9211, ImageNumber);
EXIF_TAG(0x9212, SecurityClassification);
EXIF_TAG(0x9213, ImageHistory);
EXIF_TAG(0x9214, SubjectLocation);
EXIF_TAG(0x9215, ExposureIndex);
EXIF_TAG(0x9216, TIFF/EPStandardID);
EXIF_TAG(0xa20b, FlashEnergy);
EXIF_TAG(0xa20c, SpatialFrequencyResponse);
EXIF_TAG(0xa214, SubjectLocation);
// additional things added by misha@
EXIF_TAG(0x0100, ImageWidth);
EXIF_TAG(0x0101, ImageLength);
EXIF_TAG(0x0102, BitsPerSample);
EXIF_TAG(0x0103, Compression);
EXIF_TAG(0x0106, PhotometricInterpretation);
EXIF_TAG(0x010a, FillOrder);
EXIF_TAG(0x010d, DocumentName);
EXIF_TAG(0x0111, StripOffsets);
EXIF_TAG(0x0115, SamplesPerPixel);
EXIF_TAG(0x0116, RowsPerStrip);
EXIF_TAG(0x0117, StripByteCounts);
EXIF_TAG(0x011c, PlanarConfiguration);
EXIF_TAG(0x0156, TransferRange);
EXIF_TAG(0x0200, JPEGProc);
EXIF_TAG(0x0201, JPEGInterchangeFormat);
EXIF_TAG(0x0202, JPEGInterchangeFormatLength);
EXIF_TAG(0x0212, YCbCrSubSampling);
EXIF_TAG(0xa401, CustomRendered);
EXIF_TAG(0xa402, ExposureMode);
EXIF_TAG(0xa403, WhiteBalance);
EXIF_TAG(0xa404, DigitalZoomRatio);
EXIF_TAG(0xa405, FocalLengthIn35mmFilm);
EXIF_TAG(0xa406, SceneCaptureType);
EXIF_TAG(0xa407, GainControl);
EXIF_TAG(0xa408, Contrast);
EXIF_TAG(0xa409, Saturation);
EXIF_TAG(0xa40a, Sharpness);
EXIF_TAG(0xa40b, DeviceSettingDescription);
EXIF_TAG(0xa40c, SubjectDistanceRange);
EXIF_TAG(0xa420, ImageUniqueID);
// other tags
EXIF_TAG(0xa430, CameraOwnerName);
EXIF_TAG(0xa431, BodySerialNumber);
EXIF_TAG(0xa432, LensSpecification);
EXIF_TAG(0xa433, LensManufactor);
EXIF_TAG(0xa434, LensModel);
EXIF_TAG(0xa435, LensSerialNumber);
}
static EXIF_tag_value2name &instance(){
static EXIF_tag_value2name *singleton=NULL;
if(!singleton)
singleton=new EXIF_tag_value2name;
return *singleton;
}
};
class EXIF_gps_tag_value2name: public Hash<int, const char*> {
public:
EXIF_gps_tag_value2name() {
EXIF_TAG(0x0, GPSVersionID);
EXIF_TAG(0x1, GPSLatitudeRef);
EXIF_TAG(0x2, GPSLatitude);
EXIF_TAG(0x3, GPSLongitudeRef);
EXIF_TAG(0x4, GPSLongitude);
EXIF_TAG(0x5, GPSAltitudeRef);
EXIF_TAG(0x6, GPSAltitude);
EXIF_TAG(0x7, GPSTimeStamp);
EXIF_TAG(0x8, GPSSatellites);
EXIF_TAG(0x9, GPSStatus);
EXIF_TAG(0xA, GPSMeasureMode);
EXIF_TAG(0xB, GPSDOP);
EXIF_TAG(0xC, GPSSpeedRef);
EXIF_TAG(0xD, GPSSpeed);
EXIF_TAG(0xE, GPSTrackRef);
EXIF_TAG(0xF, GPSTrack);
EXIF_TAG(0x10, GPSImgDirectionRef);
EXIF_TAG(0x11, GPSImgDirection);
EXIF_TAG(0x12, GPSMapDatum);
EXIF_TAG(0x13, GPSDestLatitudeRef);
EXIF_TAG(0x14, GPSDestLatitude);
EXIF_TAG(0x15, GPSDestLongitudeRef);
EXIF_TAG(0x16, GPSDestLongitude);
EXIF_TAG(0x17, GPSDestBearingRef);
EXIF_TAG(0x18, GPSDestBearing);
EXIF_TAG(0x19, GPSDestDistanceRef);
EXIF_TAG(0x1A, GPSDestDistance);
EXIF_TAG(0x1B, GPSProcessingMethod);
EXIF_TAG(0x1C, GPSAreaInformation);
EXIF_TAG(0x1D, GPSDateStamp);
EXIF_TAG(0x1E, GPSDifferential);
}
static EXIF_gps_tag_value2name &instance(){
static EXIF_gps_tag_value2name *singleton=NULL;
if(!singleton)
singleton=new EXIF_gps_tag_value2name;
return *singleton;
}
};
///*********************************************** support functions
class Measure_reader {
public:
virtual size_t read(const char* &buf, size_t limit)=0;
virtual void seek(uint64_t value)=0;
virtual uint64_t tell()=0;
virtual uint64_t length()=0;
};
class Measure_file_reader: public Measure_reader {
const String& file_name;
int f;
public:
Measure_file_reader(int af, const String& afile_name):
file_name(afile_name), f(af) {
}
override size_t read(const char* &abuf, size_t limit) {
if(limit==0)
return 0;
char* lbuf=new(PointerFreeGC) char[limit];
ssize_t read_size=::read(f, lbuf, limit); abuf=lbuf;
if(read_size<0)
throw Exception(0, &file_name, "measure read failed: %s (%d)", strerror(errno), errno);
return read_size;
}
override void seek(uint64_t value) {
if(pa_lseek(f, value, SEEK_SET)<0)
throw Exception(IMAGE_FORMAT, &file_name, "seek to %.15g failed: %s (%d)", (double)value, strerror(errno), errno);
}
override uint64_t tell() { return pa_lseek(f, 0, SEEK_CUR); }
override uint64_t length() { return pa_lseek(f, 0, SEEK_END); }
};
class Measure_buf_reader: public Measure_reader {
const char* buf; size_t size;
const String& file_name;
size_t offset;
public:
Measure_buf_reader(const char* abuf, size_t asize, const String& afile_name):
buf(abuf), size(asize), file_name(afile_name), offset(0) {
}
override size_t read(const char* &abuf, size_t limit) {
size_t to_read=min(limit, size-offset);
abuf=buf+offset;
offset+=to_read;
return to_read;
}
override void seek(uint64_t value) {
if(value>(uint64_t)size)
throw Exception(IMAGE_FORMAT, &file_name, "seek to %.15g failed: out of buffer (%.15g)", value, size);
offset=(size_t)value;
}
override uint64_t tell() { return offset; }
override uint64_t length() { return size; }
};
struct Measure_info {
ushort width;
ushort height;
Value** exif;
Value** xmp;
Charset* xmp_charset;
bool video;
};
inline ushort x_endian_to_ushort(uchar b0, uchar b1) {
return (ushort)((b1<<8) + b0);
}
inline uint x_endian_to_uint(uchar b0, uchar b1, uchar b2, uchar b3) {
return (uint)(((((b3<<8) + b2)<<8)+b1)<<8)+b0;
}
inline ushort endian_to_ushort(bool is_big, const uchar *b/* [2] */) {
return is_big ? x_endian_to_ushort(b[1], b[0]) : x_endian_to_ushort(b[0], b[1]);
}
inline uint endian_to_uint(bool is_big, const uchar *b /* [4] */) {
return is_big ? x_endian_to_uint(b[3], b[2], b[1], b[0]) : x_endian_to_uint(b[0], b[1], b[2], b[3]);
}
///*********************************************** JPEG
struct JPG_Segment_head {
uchar marker;
uchar code;
uchar length[2];
};
/// JPEG frame header
struct JPG_Size_segment_body {
char data; //< data precision of bits/sample
uchar height[2]; //< image height
uchar width[2]; //< image width
char numComponents; //< number of color components
};
/// JPEG Exif TIFF Header
struct JPG_Exif_TIFF_header {
char byte_align_identifier[2];
uchar signature[2]; // always 000A [or 0A00]
uchar first_IFD_offset[4]; // Usually the first IFD starts immediately next to TIFF header, so this offset has value '0x00000008'.
};
// JPEG Exif IFD start
struct JPG_Exif_IFD_begin {
uchar directory_entry_count[2]; // the number of directory entry contains in this IFD
};
// TTTT ffff NNNNNNNN DDDDDDDD
struct JPG_Exif_IFD_entry {
uchar tag[2]; // Tag number, this shows a kind of data
uchar format[2]; // data format
uchar components_count[4]; // number of components
uchar value_or_offset_to_it[4]; // data value or offset to data value
};
#define JPG_IFD_TAG_EXIF_OFFSET 0x8769
#define JPG_IFD_TAG_EXIF_GPS_OFFSET 0x8825
#define JPEG_EXIF_DATE_CHARS 20
static Value* parse_IFD_entry_formatted_one_value(bool is_big, ushort format, size_t component_size, const uchar *value) {
switch(format) {
case 1: // unsigned byte
return new VInt((uchar)value[0]);
case 3: // unsigned short
return new VInt(endian_to_ushort(is_big, value));
case 4: // unsigned long
// 'double' because parser's Int is signed
return new VDouble(endian_to_uint(is_big, value));
case 5: // unsigned rational
{
uint numerator=endian_to_uint(is_big, value); value+=component_size/2;
uint denominator=endian_to_uint(is_big, value);
if(!denominator)
return 0;
return new VDouble(((double)numerator)/denominator);
}
case 6: // signed byte
return new VInt((signed char)value[0]);
case 8: // signed short
return new VInt((signed short)endian_to_ushort(is_big, value));
case 9: // signed long
return new VInt((signed int)endian_to_uint(is_big, value));
case 10: // signed rational
{
signed int numerator=(signed int)endian_to_uint(is_big, value); value+=component_size/2;
uint denominator=endian_to_uint(is_big, value);
if(!denominator)
return 0;
return new VDouble(numerator/denominator);
}
/*
case 11: // single float
@todo
case 12: // double float
@todo
*/
};
return 0;
}
// date.C
tm cstr_to_time_t(char *, const char **);
static Value* parse_IFD_entry_formatted_value(bool is_big, ushort format, size_t component_size, uint components_count, const uchar *value) {
if(format==2) { // ascii string, exception: the only type with varying size
const char* cstr=(const char* )value;
size_t length=components_count;
// Data format is "YYYY:MM:DD HH:MM:SS"+0x00, total 20bytes
if(length==JPEG_EXIF_DATE_CHARS && isdigit((unsigned char)cstr[0]) && cstr[length-1]==0) {
try {
tm tmIn=cstr_to_time_t(pa_strdup(cstr), 0);
return new VDate(tmIn);
}
catch(...) { /*ignore bad date times*/ }
}
return new VString(cstr);
}
if(components_count==1)
return parse_IFD_entry_formatted_one_value(is_big, format, component_size, value);
VHash* result=new VHash;
HashStringValue& hash=result->hash();
for(uint i=0; i<components_count; i++, value+=component_size) {
hash.put(
String::Body::uitoa(i),
parse_IFD_entry_formatted_one_value(is_big, format, component_size, value));
}
return result;
}
static Value* parse_IFD_entry_value(bool is_big, Measure_reader& reader, uint64_t tiff_base, JPG_Exif_IFD_entry& entry) {
size_t format2component_size[]={
0, // undefined
1, // unsigned byte
1, // ascii string
2, // unsigned short
4, // unsigned long
8, // unsigned rational
1, // signed byte
0, // undefined
2, // signed short
4, // signed long
8, // signed rational
/*
4, // single float
8, // double float
*/
};
ushort format=endian_to_ushort(is_big, entry.format);
if(format>=sizeof(format2component_size)/sizeof(format2component_size[0]))
return 0; // format out of range, ignoring
size_t component_size=format2component_size[format];
if(component_size==0)
return 0; // undefined format
// You can get the total data byte length by multiplies
// a 'bytes/components' value (see above chart) by number of components stored 'NNNNNNNN' area
uint components_count=endian_to_uint(is_big, entry.components_count);
uint value_size=component_size*components_count;
// If its size is over 4bytes, 'DDDDDDDD' contains the offset to data stored address
Value* result;
if(value_size<=4)
result=parse_IFD_entry_formatted_value(is_big, format, component_size, components_count, entry.value_or_offset_to_it);
else {
uint64_t remembered=reader.tell();
{
reader.seek(tiff_base+endian_to_uint(is_big, entry.value_or_offset_to_it));
const char* value;
if(reader.read(value, value_size)<value_size)
return 0;
result=parse_IFD_entry_formatted_value(is_big, format, component_size, components_count, (const uchar*)value);
}
reader.seek(remembered);
}
return result;
}
static void parse_IFD(HashStringValue& hash, bool is_big, Measure_reader& reader, uint64_t tiff_base, bool gps=false);
static void parse_IFD_entry(HashStringValue& hash, bool is_big, Measure_reader& reader, uint64_t tiff_base, JPG_Exif_IFD_entry& entry, bool gps=false) {
ushort tag=endian_to_ushort(is_big, entry.tag);
if(tag==JPG_IFD_TAG_EXIF_OFFSET || tag==JPG_IFD_TAG_EXIF_GPS_OFFSET){
uint64_t remembered=reader.tell();
{
reader.seek(tiff_base+endian_to_uint(is_big, entry.value_or_offset_to_it));
parse_IFD(hash, is_big, reader, tiff_base, (tag==JPG_IFD_TAG_EXIF_GPS_OFFSET)?true:gps);
}
reader.seek(remembered);
return;
}
if(Value* value=parse_IFD_entry_value(is_big, reader, tiff_base, entry)) {
if(const char* name=(gps ? EXIF_gps_tag_value2name::instance().get(tag) : EXIF_tag_value2name::instance().get(tag)))
hash.put(name, value);
else
hash.put(String::Body::uitoa((int)tag), value);
}
}
static void parse_IFD(HashStringValue& hash, bool is_big, Measure_reader& reader, uint64_t tiff_base, bool gps) {
const char* buf;
if(reader.read(buf, sizeof(JPG_Exif_IFD_begin))<sizeof(JPG_Exif_IFD_begin))
return;
JPG_Exif_IFD_begin *start=(JPG_Exif_IFD_begin *)buf;
ushort directory_entry_count=endian_to_ushort(is_big, start->directory_entry_count);
for(int i=0; i<directory_entry_count; i++) {
if(reader.read(buf, sizeof(JPG_Exif_IFD_entry))<sizeof(JPG_Exif_IFD_entry))
return;
parse_IFD_entry(hash, is_big, reader, tiff_base, *(JPG_Exif_IFD_entry *)buf, gps);
}
// then goes: LLLLLLLL Offset to next IFD [not going there]
}
static Value* parse_exif(Measure_reader& reader) {
const char* buf;
uint64_t tiff_base=reader.tell();
if(reader.read(buf, sizeof(JPG_Exif_TIFF_header))<sizeof(JPG_Exif_TIFF_header))
return 0;
JPG_Exif_TIFF_header *head=(JPG_Exif_TIFF_header *)buf;
bool is_big=head->byte_align_identifier[0]=='M'; // [M]otorola vs [I]ntel
uint first_IFD_offset=endian_to_uint(is_big, head->first_IFD_offset);
reader.seek(tiff_base+first_IFD_offset);
VHash* vhash=new VHash;
// IFD
parse_IFD(vhash->hash(), is_big, reader, tiff_base);
return vhash;
}
static Value* parse_xmp(Measure_reader& reader, ushort xmp_length, Measure_info &info) {
const char* buf;
if(reader.read(buf, xmp_length)<xmp_length)
return 0;
String::C xmp = Charset::transcode(String::C(pa_strdup(buf, xmp_length), xmp_length), *info.xmp_charset, pa_thread_request().charsets.source());
return new VString(*new String(xmp, String::L_TAINTED));
}
static void measure_jpeg(const String& origin_string, Measure_reader& reader, Measure_info &info) {
// JFIF format markers
const uchar MARKER=0xFF;
const uchar CODE_SIZE_A=0xC0;
const uchar CODE_SIZE_B=0xC1;
const uchar CODE_SIZE_C=0xC2;
const uchar CODE_SIZE_D=0xC3;
const uchar CODE_APP1=0xE1;
const char* buf;
const size_t prefix_size=2;
if(reader.read(buf, prefix_size)<prefix_size)
throw Exception(IMAGE_FORMAT, &origin_string, "not JPEG file - too small");
uchar *signature=(uchar *)buf;
if(!(signature[0]==0xFF && signature[1]==0xD8))
throw Exception(IMAGE_FORMAT, &origin_string, "not JPEG file - wrong signature");
while(true) {
uint64_t segment_base=reader.tell()+2/*marker,code*/;
if(reader.read(buf, sizeof(JPG_Segment_head))<sizeof(JPG_Segment_head))
break;
JPG_Segment_head *head=(JPG_Segment_head *)buf;
// Verify that it's a valid segment.
if(head->marker!=MARKER)
throw Exception(IMAGE_FORMAT, &origin_string, "not JPEG file - marker not found");
ushort segment_length=endian_to_ushort(true, head->length);
switch(head->code) {
// http://dev.exiv2.org/projects/exiv2/wiki/The_Metadata_in_JPEG_files
case CODE_APP1:
{
const size_t EXIF_SIG_LEN=6; // Exif\0\0
const size_t XMP_SIG_LEN=29; // http://ns.adobe.com/xap/1.0/\0
if(segment_length<EXIF_SIG_LEN+2 || reader.read(buf, EXIF_SIG_LEN)<EXIF_SIG_LEN)
break;
if(memcmp(buf, "Exif\0\0", EXIF_SIG_LEN)==0){
if(info.exif && !*info.exif) // backward compatibility: using first segment
*info.exif=parse_exif(reader);
break;
}
if(memcmp(buf, "http:/", EXIF_SIG_LEN))
break;
if(segment_length<XMP_SIG_LEN+2 || reader.read(buf, XMP_SIG_LEN-EXIF_SIG_LEN)<XMP_SIG_LEN-EXIF_SIG_LEN)
break;
if(memcmp(buf, "/ns.adobe.com/xap/1.0/\0", XMP_SIG_LEN-EXIF_SIG_LEN)==0){
if(info.xmp && !*info.xmp) // backward compatibility: using first segment
*info.xmp=parse_xmp(reader, segment_length - XMP_SIG_LEN - 2 /* segment_length */, info);
}
}
break;
case CODE_SIZE_A:
case CODE_SIZE_B:
case CODE_SIZE_C:
case CODE_SIZE_D:
{
// Segments that contain size info
if(reader.read(buf, sizeof(JPG_Size_segment_body))<sizeof(JPG_Size_segment_body))
throw Exception(IMAGE_FORMAT, &origin_string, "not JPEG file - cannot fully read Size segment");
JPG_Size_segment_body *body=(JPG_Size_segment_body *)buf;
info.width=endian_to_ushort(true, body->width);
info.height=endian_to_ushort(true, body->height);
}
return;
};
reader.seek(segment_base + segment_length);
}
throw Exception(IMAGE_FORMAT, &origin_string, "broken JPEG file - size frame not found");
}
///*********************************************** TIFF
static bool parse_tiff_IFD(bool is_big, Measure_reader& reader, Measure_info &info) {
const char* buf;
if(reader.read(buf, sizeof(JPG_Exif_IFD_begin))<sizeof(JPG_Exif_IFD_begin))
return false;
JPG_Exif_IFD_begin *start=(JPG_Exif_IFD_begin *)buf;
ushort directory_entry_count=endian_to_ushort(is_big, start->directory_entry_count);
for(int i=0; i<directory_entry_count; i++) {
if(reader.read(buf, sizeof(JPG_Exif_IFD_entry))<sizeof(JPG_Exif_IFD_entry))
return false;
JPG_Exif_IFD_entry *entry=(JPG_Exif_IFD_entry *)buf;
ushort entry_tag=endian_to_ushort(is_big, entry->tag);
if(entry_tag == 256 || entry_tag == 257){
ushort entry_format=endian_to_ushort(is_big, entry->format);
if(entry_format != 3 && entry_format != 4 || endian_to_uint(is_big, entry->components_count) != 1)
return false;
uint value = (entry_format == 3) ? endian_to_ushort(is_big, entry->value_or_offset_to_it) : endian_to_uint(is_big, entry->value_or_offset_to_it);
(entry_tag == 256) ? info.width=(short)value : info.height=(short)value;
if(info.width && info.height)
return true;
}
}
return false;
// then goes: LLLLLLLL Offset to next IFD [not going there]
}
static void measure_tiff(const String& origin_string, Measure_reader& reader, Measure_info &info) {
const char* buf;
if(reader.read(buf, sizeof(JPG_Exif_TIFF_header))<sizeof(JPG_Exif_TIFF_header))
throw Exception(IMAGE_FORMAT, &origin_string, "not TIFF file - too small");
JPG_Exif_TIFF_header *head=(JPG_Exif_TIFF_header *)buf;
if(strncmp(head->byte_align_identifier, "II", 2)!=0 && strncmp(head->byte_align_identifier, "MM", 2)!=0)
throw Exception(IMAGE_FORMAT, &origin_string, "not TIFF file - wrong signature");
bool is_big=head->byte_align_identifier[0]=='M'; // [M]otorola vs [I]ntel
if(endian_to_ushort(is_big, head->signature) != 42)
throw Exception(IMAGE_FORMAT, &origin_string, "not TIFF file - wrong signature");
reader.seek(endian_to_uint(is_big, head->first_IFD_offset));
if(!parse_tiff_IFD(is_big, reader, info))
throw Exception(IMAGE_FORMAT, &origin_string, "broken TIFF file - size field entry not found");
}
///*********************************************** GIF
struct GIF_Header {
char signature[3]; // 'GIF'
char version[3];
uchar width[2];
uchar height[2];
char dif;
char fonColor;
char nulls;
};
static void measure_gif(const String& origin_string, Measure_reader& reader, ushort& width, ushort& height) {
const char* buf;
const size_t head_size=sizeof(GIF_Header);
if(reader.read(buf, head_size)<head_size)
throw Exception(IMAGE_FORMAT, &origin_string, "not GIF file - too small");
GIF_Header *head=(GIF_Header *)buf;
if(strncmp(head->signature, "GIF", 3)!=0)
throw Exception(IMAGE_FORMAT, &origin_string, "not GIF file - wrong signature");
width=endian_to_ushort(false, head->width);
height=endian_to_ushort(false, head->height);
}
///*********************************************** PNG
struct PNG_Header {
char dummy[12];
char signature[4]; //< must be "IHDR"
uchar high_width[2]; //< image width high bytes [we ignore for now]
uchar width[2]; //< image width low bytes
uchar high_height[2]; //< image height high bytes [we ignore for now]
uchar height[4]; //< image height
};
static void measure_png(const String& origin_string, Measure_reader& reader, ushort& width, ushort& height) {
const char* buf;
const size_t head_size=sizeof(PNG_Header);
if(reader.read(buf, head_size)<head_size)
throw Exception(IMAGE_FORMAT, &origin_string, "not PNG file - too small");
PNG_Header *head=(PNG_Header *)buf;
if(strncmp(head->signature, "IHDR", 4)!=0)
throw Exception(IMAGE_FORMAT, &origin_string, "not PNG file - wrong signature");
width=endian_to_ushort(true, head->width);
height=endian_to_ushort(true, head->height);
}
///*********************************************** BMP
struct BMP_Header {
char signature[2]; // 'BM'
uchar file_size[4];
uchar reserved[4];
uchar bitmap_offset[4];
uchar header_size[4];
uchar width[2];
uchar high_width[2]; //< image width high bytes [we ignore for now]
uchar height[2];
uchar high_height[2]; //< image height high bytes [we ignore for now]
};
static void measure_bmp(const String& origin_string, Measure_reader& reader, ushort& width, ushort& height) {
const char* buf;
const size_t head_size=sizeof(BMP_Header);
if(reader.read(buf, head_size)<head_size)
throw Exception(IMAGE_FORMAT, &origin_string, "not BMP file - too small");
BMP_Header *head=(BMP_Header *)buf;
if(strncmp(head->signature, "BM", 2)!=0)
throw Exception(IMAGE_FORMAT, &origin_string, "not BMP file - wrong signature");
if((uint)reader.length() != endian_to_uint(false, head->file_size))
throw Exception(IMAGE_FORMAT, &origin_string, "not BMP file - length header and file size do not match");
width=endian_to_ushort(false, head->width);
height=endian_to_ushort(false, head->height);
}
///*********************************************** WEBP
struct WEBP_Header {
char signature_riff[4]; // 'RIFF'
uchar file_size[4];
char signature[4]; // 'WEBP'
char format[4]; // 'VP8 ' or 'VP8L' or 'VP8X'
};
struct WEBP_VP8_Chunk {
uchar size[4];
char tag[3];
uchar signature[3]; // 0x9D 0x01 0x2A
uchar width[2]; // 14 bits each
uchar height[2]; // 14 bits each
};
struct WEBP_VP8L_Chunk {
uchar size[4];
char signature; // 0x2F
uchar width_height[4]; // 14 bits each
};
struct WEBP_X_Chunk {
uchar size[4];
char reserved[4];
uchar width[3];
uchar height[3];
};
static void measure_webp(const String& origin_string, Measure_reader& reader, ushort& width, ushort& height) {
const char* buf;
if(reader.read(buf, sizeof(WEBP_Header))<sizeof(WEBP_Header))
throw Exception(IMAGE_FORMAT, &origin_string, "not WEBP file - too small");
WEBP_Header *head=(WEBP_Header *)buf;
if(strncmp(head->signature_riff, "RIFF", 4)!=0 || strncmp(head->signature, "WEBP", 4)!=0)
throw Exception(IMAGE_FORMAT, &origin_string, "not WEBP file - wrong signature");
if(strncmp(head->format, "VP8 ", 4)==0){
if(reader.read(buf, sizeof(WEBP_VP8_Chunk))<sizeof(WEBP_VP8_Chunk))
throw Exception(IMAGE_FORMAT, &origin_string, "broken WEBP file - too small VP8 chunk");
WEBP_VP8_Chunk *chunk=(WEBP_VP8_Chunk *)buf;
if (chunk->signature[0] != 0x9D || chunk->signature[1] != 0x01 || chunk->signature[2] != 0x2A)
throw Exception(IMAGE_FORMAT, &origin_string, "broken WEBP file - wrong VP8 chunk signature");
width=endian_to_ushort(false, chunk->width) & 0x3FFF;
height=endian_to_ushort(false, chunk->height) & 0x3FFF;
} else if(strncmp(head->format, "VP8L", 4)==0){
if(reader.read(buf, sizeof(WEBP_VP8L_Chunk))<sizeof(WEBP_VP8L_Chunk))
throw Exception(IMAGE_FORMAT, &origin_string, "broken WEBP file - too small VP8L chunk");
WEBP_VP8L_Chunk *chunk=(WEBP_VP8L_Chunk *)buf;
if(chunk->signature != 0x2F)
throw Exception(IMAGE_FORMAT, &origin_string, "broken WEBP file - wrong VP8L chunk signature");
uint wh=endian_to_uint(false, chunk->width_height);
width=(wh & 0x3FFF) + 1;
height=((wh >> 14) & 0x3FFF) + 1;
} else if (strncmp(head->format, "VP8X", 4)==0){
if(reader.read(buf, sizeof(WEBP_X_Chunk))<sizeof(WEBP_X_Chunk))
throw Exception(IMAGE_FORMAT, &origin_string, "broken WEBP file - too small VP8X chunk");
WEBP_X_Chunk *chunk=(WEBP_X_Chunk *)buf;
width=endian_to_ushort(false, chunk->width) + 1; // we ignore third byte to simplify code
height=endian_to_ushort(false, chunk->height) + 1; // we ignore third byte to simplify code
} else throw Exception(IMAGE_FORMAT, &origin_string, "broken WEBP file - invalid chunk signature");
}
///*********************************************** MP4
struct MP4_Header {
uchar size[4];
char signature[4]; // 'ftyp' in first chunk
};
struct MP4_ExtSize {
uchar high[4];
uchar low[4];
};
struct MP4_Tkhd {
uchar width[4];
uchar height[4];
};
static bool measure_mp4(const String& origin_string, Measure_reader& reader, ushort& width, ushort& height, uint64_t anext, const char* lastTkhd=NULL) {
for(bool first=anext==0;;){
const char* buf;
uint64_t next=reader.tell();
if(reader.read(buf, sizeof(MP4_Header))<sizeof(MP4_Header))
throw Exception(IMAGE_FORMAT, &origin_string, first ? "not MP4 file - too small" : "broken MP4 file - truncated chunk header");
MP4_Header *head=(MP4_Header *)buf;
uint64_t size=endian_to_uint(true, head->size);
if(size==1){
if(reader.read(buf, sizeof(MP4_ExtSize))<sizeof(MP4_ExtSize))
throw Exception(IMAGE_FORMAT, &origin_string, "broken MP4 file - truncated chunk extended size header");
MP4_ExtSize *ext_size=(MP4_ExtSize *)buf;
size=((uint64_t)endian_to_uint(true, ext_size->high) << 32) + endian_to_uint(true, ext_size->low);
}
next+=size;
if(first){
if(strncmp(head->signature, "ftyp", 4)!=0)
throw Exception(IMAGE_FORMAT, &origin_string, "not MP4 file - wrong signature");
first=false;
anext=reader.length(); // to avoid reading beyond EOF
} else if(strncmp(head->signature, "moov", 4)==0 || strncmp(head->signature, "mdia", 4)==0 || strncmp(head->signature, "trak", 4)==0) {
if(measure_mp4(origin_string, reader, width, height, next, lastTkhd))
return true;
} else if(strncmp(head->signature, "tkhd", 4)==0) {
if(size>8){
reader.seek(next-8);
if(reader.read(lastTkhd, sizeof(MP4_Tkhd))<sizeof(MP4_Tkhd))
throw Exception(IMAGE_FORMAT, &origin_string, "broken MP4 file - bad tkhd chunk");
}
} else if (strncmp(head->signature, "hdlr", 4)==0) {
if(size>12){
const char* hdlr;
if(reader.read(hdlr, 12)<12)
throw Exception(IMAGE_FORMAT, &origin_string, "broken MP4 file - bad hdlr chunk");
if(lastTkhd && strncmp(hdlr+8, "vide", 4)==0) {
MP4_Tkhd *tkhd=(MP4_Tkhd *)lastTkhd;
width=endian_to_ushort(true, tkhd->width);
height=endian_to_ushort(true, tkhd->height);
return true;
}
}
}
if(anext && next>=anext)
break;
reader.seek(next);
}
return false;
}
static void measure_mp4(const String& origin_string, Measure_reader& reader, ushort& width, ushort& height) {
if(!measure_mp4(origin_string, reader, width, height, 0))
throw Exception(IMAGE_FORMAT, &origin_string, "unsupported MP4 file - size not found");
}
///*********************************************** measure center
static void measure(const String& file_name, Measure_reader& reader, Measure_info &info) {
const char* file_name_cstr=file_name.taint_cstr(String::L_FILE_SPEC);
if(const char* cext=strrchr(file_name_cstr, '.')) {
cext++;
if(strcasecmp(cext, "GIF")==0)
measure_gif(file_name, reader, info.width, info.height);
else if(strcasecmp(cext, "JPG")==0 || strcasecmp(cext, "JPEG")==0)
measure_jpeg(file_name, reader, info);
else if(strcasecmp(cext, "PNG")==0)
measure_png(file_name, reader, info.width, info.height);
else if(strcasecmp(cext, "BMP")==0)
measure_bmp(file_name, reader, info.width, info.height);
else if(strcasecmp(cext, "WEBP")==0)
measure_webp(file_name, reader, info.width, info.height);
else if(strcasecmp(cext, "TIF")==0 || strcasecmp(cext, "TIFF")==0)
measure_tiff(file_name, reader, info);
else if(strcasecmp(cext, "MP4")==0 || strcasecmp(cext, "MOV")==0)
if(info.video)
measure_mp4(file_name, reader, info.width, info.height);
else
throw Exception(IMAGE_FORMAT, &file_name, "handling disabled for file name extension '%s'", cext);
else
throw Exception(IMAGE_FORMAT, &file_name, "unhandled file name extension '%s'", cext);
} else
throw Exception(IMAGE_FORMAT, &file_name, "cannot determine file type - no file name extension");
}
// methods
static void file_measure_action(struct stat& /*finfo*/, int f, const String& file_spec, void *context) {
Measure_file_reader reader(f, file_spec);
measure(file_spec, reader, *static_cast<Measure_info *>(context));
}
static void _measure(Request& r, MethodParams& params) {
Value& data=params.as_no_junction(0, "data must not be code");
Value* exif=0;
Value* xmp=0;
Measure_info info={ 0, 0, 0, 0, &pa_UTF8_charset, false };
if(params.count()>1)
if(HashStringValue* options=params.as_hash(1, "methods options")) {
for(HashStringValue::Iterator i(*options); i; i.next() ){
String::Body key=i.key();
Value* value=i.value();
if(key == "exif") {
if(r.process(*value).as_bool())
info.exif=&exif;
} else if(key == "xmp") {
if(r.process(*value).as_bool())
info.xmp=&xmp;
} else if(key == "xmp-charset") {
info.xmp_charset=&pa_charsets.get(value->as_string());
} else if(key == "video") {
info.video=r.process(*value).as_bool();
} else
throw Exception(PARSER_RUNTIME, 0, CALLED_WITH_INVALID_OPTION);
}
}
const String* file_name;
if(file_name=data.get_string()) {
file_read_action_under_lock(r.full_disk_path(*file_name), "measure", file_measure_action, &info);
} else {
VFile* vfile=data.as_vfile();
file_name=&vfile->fields().get(name_name)->as_string();
Measure_buf_reader reader(vfile->value_ptr(), vfile->value_size(), *file_name);
measure(*file_name, reader, info);
}
GET_SELF(r, VImage).set(file_name, info.width, info.height, 0, exif, xmp);
}
static void append_attrib_pair(String &tag, String::Body key, Value* value){
// skip border attribute with empty value
if(key=="border" && !value->is_defined())
return;
// src="a.gif" width="123" ismap[=-1]
tag << " " << key;
if(value->is_string() || value->as_int()>=0)
tag << "=\"" << value->as_string() << "\"";
}
static void _html(Request& r, MethodParams& params) {
String tag;
tag << "<img";
const HashStringValue& fields=GET_SELF(r, VImage).fields();
HashStringValue* attribs=0;
if(params.count()) {
// for backward compatibility: someday was ^html{}
Value& vattribs=r.process(params[0]);
if(!vattribs.is_string()) { // allow empty
if((attribs=vattribs.get_hash())) {
for(HashStringValue::Iterator i(*attribs); i; i.next() )
append_attrib_pair(tag, i.key(), i.value());
} else
throw Exception(PARSER_RUNTIME, 0, "attributes must be hash");
}
}
for(HashStringValue::Iterator i(fields); i; i.next() ){
String::Body key=i.key();
// skip user-specified attributes
if(attribs && attribs->get(key))
continue;
// allow only html attributes (to exclude exif, line-*)
if(key=="src" || key=="width" || key=="height" || key=="border")
append_attrib_pair(tag, key, i.value());
}
tag << " />";
r.write(tag);
}
/// @test wrap FILE to auto-object
static gdImage* load(Request& r, const String& file_name){
const char* file_name_cstr=r.full_disk_path(file_name).taint_cstr(String::L_FILE_SPEC);
if(FILE *f=pa_fopen(file_name_cstr, "rb")) {
gdImage* image=new gdImage;
bool ok=image->CreateFromGif(f);
fclose(f);
if(!ok)
throw Exception(IMAGE_FORMAT, &file_name, "is not in GIF format");
return image;
} else {
throw Exception("file.missing", 0, "cannot open '%s'", file_name_cstr);
}
}
static void _load(Request& r, MethodParams& params) {
const String& file_name=params.as_file_name(0);
gdImage* image=load(r, file_name);
GET_SELF(r, VImage).set(&file_name, image->SX(), image->SY(), image);
}
static void _create(Request& r, MethodParams& params) {
int width=params.as_int(0, "width must be int", r);
int height=params.as_int(1, "height must be int", r);
int bgcolor_value=0xffFFff;
if(params.count()>2)
bgcolor_value=params.as_int(2, "color must be int", r);
gdImage* image=new gdImage;
image->Create(width, height);
image->FilledRectangle(0, 0, width-1, height-1, image->Color(bgcolor_value));
GET_SELF(r, VImage).set(0, width, height, image);
}
static void _gif(Request& r, MethodParams& params) {
gdImage& image=GET_SELF(r, VImage).image();
const String *file_name=params.count()>0?¶ms.as_string(0, FILE_NAME_MUST_BE_STRING):0;
gdBuf buf=image.Gif();
VFile& vfile=*new VFile;
vfile.set_binary(false/*not tainted*/, (const char *)buf.ptr, buf.size, file_name, new VString(*new String("image/gif")));
r.write(vfile);
}
static void _line(Request& r, MethodParams& params) {
gdImage& image=GET_SELF(r, VImage).image();
image.Line(
params.as_int(0, "x0 must be int", r),
params.as_int(1, "y0 must be int", r),
params.as_int(2, "x1 must be int", r),
params.as_int(3, "y1 must be int", r),
image.Color(params.as_int(4, "color must be int", r)));
}
static void _fill(Request& r, MethodParams& params) {
gdImage& image=GET_SELF(r, VImage).image();
image.Fill(
params.as_int(0, "x must be int", r),
params.as_int(1, "y must be int", r),
image.Color(params.as_int(2, "color must be int", r)));
}
static void _rectangle(Request& r, MethodParams& params) {
gdImage& image=GET_SELF(r, VImage).image();
image.Rectangle(
params.as_int(0, "x0 must be int", r),
params.as_int(1, "y0 must be int", r),
params.as_int(2, "x1 must be int", r),
params.as_int(3, "y1 must be int", r),
image.Color(params.as_int(4, "color must be int", r)));
}
static void _bar(Request& r, MethodParams& params) {
gdImage& image=GET_SELF(r, VImage).image();
image.FilledRectangle(
params.as_int(0, "x0 must be int", r),
params.as_int(1, "y0 must be int", r),
params.as_int(2, "x1 must be int", r),
params.as_int(3, "y1 must be int", r),
image.Color(params.as_int(4, "color must be int", r)));
}
#ifndef DOXYGEN
static void add_point(Table::element_type row, gdImage::Point **p) {
if(row->count()!=2)
throw Exception(0, 0, "coordinates table must contain two columns: x and y values");
(**p).x=row->get(0)->as_int();
(**p).y=row->get(1)->as_int();
(*p)++;
}
#endif
#ifndef DOXYGEN
static void add_point(int x, int y, gdImage::Point **p) {
(**p).x=x;
(**p).y=y;
(*p)++;
}
#endif
static void _replace(Request& r, MethodParams& params) {
int src_color=params.as_int(0, "src color must be int", r);
int dest_color=params.as_int(1, "dest color must be int", r);
gdImage& image=GET_SELF(r, VImage).image();
gdImage::Point* all_p=0;
size_t count=0;
if(params.count() == 3){
if(Table* table=params.as_table(2, "coordinates")){
count=table->count();
all_p=new(PointerFreeGC) gdImage::Point[count];
gdImage::Point* add_p=all_p;
table->for_each(add_point, &add_p);
}
} else {
int max_x=image.SX()-1;
int max_y=image.SY()-1;
if(max_x > 0 && max_y > 0){
count=4;
all_p=new(PointerFreeGC) gdImage::Point[count];
gdImage::Point* add_p=all_p;
add_point(0, 0, &add_p);
add_point(max_x, 0, &add_p);
add_point(max_x, max_y, &add_p);
add_point(0, max_y, &add_p);
}
}
if(count)
image.FilledPolygonReplaceColor(all_p, count, image.Color(src_color), image.Color(dest_color));
}
static void _polyline(Request& r, MethodParams& params) {
gdImage& image=GET_SELF(r, VImage).image();
if(Table* table=params.as_table(1, "coordinates")){
gdImage::Point* all_p=new(PointerFreeGC) gdImage::Point[table->count()];
gdImage::Point *add_p=all_p;
table->for_each(add_point, &add_p);
image.Polygon(all_p, table->count(), image.Color(params.as_int(0, "color must be int", r)), false/*not closed*/);
}
}
static void _polygon(Request& r, MethodParams& params) {
gdImage& image=GET_SELF(r, VImage).image();
if(Table* table=(Table*)params.as_table(1, "coordinates")){
gdImage::Point* all_p=new(PointerFreeGC) gdImage::Point[table->count()];
gdImage::Point *add_p=all_p;
table->for_each(add_point, &add_p);
image.Polygon(all_p, table->count(), image.Color(params.as_int(0, "color must be int", r)));
}
}
static void _polybar(Request& r, MethodParams& params) {
gdImage& image=GET_SELF(r, VImage).image();
if(Table* table=(Table*)params.as_table(1, "coordinates")){
gdImage::Point* all_p=new(PointerFreeGC) gdImage::Point[table->count()];
gdImage::Point *add_p=all_p;
table->for_each(add_point, &add_p);
image.FilledPolygon(all_p, table->count(), image.Color(params.as_int(0, "color must be int", r)));
}
}
// font
#define Y(y)(y+index*height)
// Font class
Font::Font(Charset& asource_charset, const String& aalphabet, gdImage* aifont, int aheight, int amonospace, int aspacebarspace, int aletterspacing):
letterspacing(aletterspacing),
height(aheight),
monospace(amonospace),
spacebarspace(aspacebarspace),
ifont(aifont),
alphabet(aalphabet),
fsource_charset(asource_charset){
if(fsource_charset.isUTF8()){
size_t index=0;
for(UTF8_string_iterator i(alphabet); i.has_next(); )
fletter2index.put_dont_replace(i.next(), index++);
}
}
/* ******************************** char ********************************** */
size_t Font::index_of(char ch) {
if(ch==' ') return STRING_NOT_FOUND;
return alphabet.pos(ch);
}
size_t Font::index_of(XMLCh ch) {
if(ch==' ') return STRING_NOT_FOUND;
return fletter2index.get(ch);
}
int Font::index_width(size_t index) {
if(index==STRING_NOT_FOUND)
return spacebarspace;
int tr=ifont->GetTransparent();
for(int x=ifont->SX()-1; x>=0; x--) {
for(int y=0; y<height; y++)
if(ifont->GetPixel(x, Y(y))!=tr)
return x+1;
}
return 0;
}
void Font::index_display(gdImage& image, int x, int y, size_t index){
if(index!=STRING_NOT_FOUND)
ifont->Copy(image, x, y, 0, Y(0), index_width(index), height);
}
/* ******************************** string ********************************** */
int Font::step_width(int index) {
return letterspacing + (monospace ? monospace : index_width(index));
}
// counts trailing letter_spacing, consider this OK. useful for contiuations
int Font::string_width(const String& s){
const char* cstr=s.cstr();
int result=0;
if(fsource_charset.isUTF8()){
for(UTF8_string_iterator i(s); i.has_next(); )
result+=step_width(index_of(i.next()));
} else {
for(const char* current=cstr; *current; current++)
result+=step_width(index_of(*current));
}
return result;
}
void Font::string_display(gdImage& image, int x, int y, const String& s){
const char* cstr=s.cstr();
if(fsource_charset.isUTF8()){
for(UTF8_string_iterator i(s); i.has_next(); ){
size_t index=index_of(i.next());
index_display(image, x, y, index);
x+=step_width(index);
}
} else {
for(const char* current=cstr; *current; current++) {
size_t index=index_of(*current);
index_display(image, x, y, index);
x+=step_width(index);
}
}
}
//
static void _font(Request& r, MethodParams& params) {
const String& alphabet=params.as_string(0, "alphabet must be string");
size_t alphabet_length=alphabet.length(r.charsets.source());
if(!alphabet_length)
throw Exception(PARSER_RUNTIME, 0, "alphabet must not be empty");
gdImage* image=load(r, params.as_file_name(1));
int spacebar_width=image->SX();
int monospace_width=0; // proportional
int letter_spacing=1;
if(params.count()>2){
if(HashStringValue* options=params[2].get_hash()){
// third option is hash
if(params.count()>3)
throw Exception(PARSER_RUNTIME, 0, "too many params were specified");
int valid_options=0;
if(Value* vspacebar_width=options->get(spacebar_width_name)){
valid_options++;
spacebar_width=r.process(*vspacebar_width).as_int();
}
if(Value* vmonospace_width=options->get(monospace_width_name)){
valid_options++;
monospace_width=r.process(*vmonospace_width).as_int();
if(!monospace_width)
monospace_width=image->SX();
}
if(Value* vletter_spacing=options->get(letter_spacing_name)){
valid_options++;
letter_spacing=r.process(*vletter_spacing).as_int();
}
if(valid_options!=options->count())
throw Exception(PARSER_RUNTIME, 0, CALLED_WITH_INVALID_OPTION);
} else {
// backward
spacebar_width=params.as_int(2, "param must be int or hash", r);
if(params.count()>3) {
monospace_width=params.as_int(3, "monospace_width must be int", r);
if(!monospace_width)
monospace_width=image->SX();
}
}
}
if(int remainder=image->SY() % alphabet_length)
throw Exception(PARSER_RUNTIME, 0, "font-file height(%d) not divisable by alphabet size(%d), remainder=%d", image->SY(), alphabet_length, remainder);
GET_SELF(r, VImage).set_font(new Font(r.charsets.source(), alphabet, image, image->SY() / alphabet_length, monospace_width, spacebar_width, letter_spacing));
}
static void _text(Request& r, MethodParams& params) {
int x=params.as_int(0, "x must be int", r);
int y=params.as_int(1, "y must be int", r);
const String& s=params.as_string(2, "text must be string");
VImage& vimage=GET_SELF(r, VImage);
vimage.font().string_display(vimage.image(), x, y, s);
}
static void _length(Request& r, MethodParams& params) {
const String& s=params.as_string(0, "text must be string");
VImage& vimage=GET_SELF(r, VImage);
r.write(*new VInt(vimage.font().string_width(s)));
}
static void _arc(Request& r, MethodParams& params) {
gdImage& image=GET_SELF(r, VImage).image();
image.Arc(
params.as_int(0, "center_x must be int", r),
params.as_int(1, "center_y must be int", r),
params.as_int(2, "width must be int", r),
params.as_int(3, "height must be int", r),
params.as_int(4, "start degrees must be int", r),
params.as_int(5, "end degrees must be int", r),
image.Color(params.as_int(6, "cx must be int", r)));
}
static void _sector(Request& r, MethodParams& params) {
gdImage& image=GET_SELF(r, VImage).image();
image.Sector(
params.as_int(0, "center_x must be int", r),
params.as_int(1, "center_y must be int", r),
params.as_int(2, "width must be int", r),
params.as_int(3, "height must be int", r),
params.as_int(4, "start degrees must be int", r),
params.as_int(5, "end degrees must be int", r),
image.Color(params.as_int(6, "color must be int", r)));
}
static void _circle(Request& r, MethodParams& params) {
gdImage& image=GET_SELF(r, VImage).image();
int size=params.as_int(2, "radius must be int", r)*2;
image.Arc(
params.as_int(0, "center_x must be int", r),
params.as_int(1, "center_y must be int", r),
size, //w
size, //h
0, //s
360, //e
image.Color(params.as_int(3, "color must be int", r)));
}
gdImage& as_image(MethodParams& params, int index, const char* msg) {
Value& value=params.as_no_junction(index, msg);
if(VImage* vimage=dynamic_cast<VImage *>(&value)) {
return vimage->image();
} else
throw Exception(PARSER_RUNTIME, 0, msg);
}
static void _copy(Request& r, MethodParams& params) {
gdImage& dest=GET_SELF(r, VImage).image();
gdImage& src=as_image(params, 0, "src must be image");
int sx=params.as_int(1, "src_x must be int", r);
int sy=params.as_int(2, "src_y must be int", r);
int sw=params.as_int(3, "src_w must be int", r);
int sh=params.as_int(4, "src_h must be int", r);
int dx=params.as_int(5, "dest_x must be int", r);
int dy=params.as_int(6, "dest_y must be int", r);
if(params.count()>1+2+2+2) {
int dw=params.as_int(1+2+2+2, "dest_w must be int", r);
int dh=(int)(params.count()>1+2+2+2+1?
params.as_int(1+2+2+2+1, "dest_h must be int", r):sh*(((double)dw)/((double)sw)));
int tolerance=params.count()>1+2+2+2+2?
params.as_int(1+2+2+2+2, "tolerance must be int", r):150;
src.CopyResampled(dest, dx, dy, sx, sy, dw, dh, sw, sh, tolerance);
} else
src.Copy(dest, dx, dy, sx, sy, sw, sh);
}
static void _pixel(Request& r, MethodParams& params) {
gdImage& image=GET_SELF(r, VImage).image();
int x=params.as_int(0, "x must be int", r);
int y=params.as_int(1, "y must be int", r);
if(params.count()>2) {
image.SetPixel(x, y,
image.Color(params.as_int(2, "color must be int", r)));
} else
r.write(*new VInt(image.DecodeColor(image.GetPixel(x, y))));
}
// constructor
MImage::MImage(): Methoded("image") {
// ^image:measure[DATA]
// ^image:measure[DATA; $.exif(false) $.xmp(false) $.xmp-charset[UTF-8] ]
add_native_method("measure", Method::CT_DYNAMIC, _measure, 1, 2);
// ^image.html[]
// ^image.html[hash]
add_native_method("html", Method::CT_DYNAMIC, _html, 0, 1);
// ^image.load[background.gif]
add_native_method("load", Method::CT_DYNAMIC, _load, 1, 1);
// ^image.create[width;height] bgcolor=white
// ^image.create[width;height;bgcolor]
add_native_method("create", Method::CT_DYNAMIC, _create, 2, 3);
// ^image.gif[]
add_native_method("gif", Method::CT_DYNAMIC, _gif, 0, 1);
// ^image.line(x0;y0;x1;y1;color)
add_native_method("line", Method::CT_DYNAMIC, _line, 5, 5);
// ^image.fill(x;y;color)
add_native_method("fill", Method::CT_DYNAMIC, _fill, 3, 3);
// ^image.rectangle(x0;y0;x1;y1;color)
add_native_method("rectangle", Method::CT_DYNAMIC, _rectangle, 5, 5);
// ^image.bar(x0;y0;x1;y1;color)
add_native_method("bar", Method::CT_DYNAMIC, _bar, 5, 5);
// ^image.replace(color-source;color-dest)[table x:y]
// ^image.replace(color-source;color-dest)
add_native_method("replace", Method::CT_DYNAMIC, _replace, 2, 3);
// ^image.polyline(color)[table x:y]
add_native_method("polyline", Method::CT_DYNAMIC, _polyline, 2, 2);
// ^image.polygon(color)[table x:y]
add_native_method("polygon", Method::CT_DYNAMIC, _polygon, 2, 2);
// ^image.polybar(color)[table x:y]
add_native_method("polybar", Method::CT_DYNAMIC, _polybar, 2, 2);
// ^image.font[alPHAbet;font-file-name.gif]
// ^image.font[alPHAbet;font-file-name.gif](spacebar_width)
// ^image.font[alPHAbet;font-file-name.gif](spacebar_width;letter_width)
// ^image.font[alPHAbet;font-file-name.gif][$.space-width(.) $.letter-width(.) $.letter-space(.)]
add_native_method("font", Method::CT_DYNAMIC, _font, 2, 4);
// ^image.text(x;y)[text]
add_native_method("text", Method::CT_DYNAMIC, _text, 3, 3);
// ^image.length[text]
add_native_method("length", Method::CT_DYNAMIC, _length, 1, 1);
// ^image.arc(center x;center y;width;height;start in degrees;end in degrees;color)
add_native_method("arc", Method::CT_DYNAMIC, _arc, 7, 7);
// ^image.sector(center x;center y;width;height;start in degrees;end in degrees;color)
add_native_method("sector", Method::CT_DYNAMIC, _sector, 7, 7);
// ^image.circle(center x;center y;r;color)
add_native_method("circle", Method::CT_DYNAMIC, _circle, 4, 4);
// ^image.copy[source](src x;src y;src w;src h;dst x;dst y[;dest w[;dest h[;tolerance]]])
add_native_method("copy", Method::CT_DYNAMIC, _copy, 1+2+2+2, (1+2+2+2)+2+1);
// ^image.pixel(x;y)[(color)]
add_native_method("pixel", Method::CT_DYNAMIC, _pixel, 2, 3);
}
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