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| version 1.30, 2001/07/07 16:38:01 | version 1.39, 2001/09/04 19:44:32 |
|---|---|
| Line 9 | Line 9 |
| */ | */ |
| static const char *RCSId="$Id$"; | static const char *RCSId="$Id$"; |
| /* | |
| 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 "pa_config_includes.h" |
| #include "gif.h" | #include "gif.h" |
| Line 41 public: // Methoded | Line 50 public: // Methoded |
| /// simple buffered reader[from memory/file], used in _measure | /// simple buffered reader[from memory/file], used in _measure |
| class Measure_reader { | class Measure_reader { |
| public: | public: |
| enum { READ_CHUNK_SIZE=0x400 };// 1K | enum { READ_CHUNK_SIZE=0x400*10 };// 10K |
| typedef size_t(*Func)(void *& buf, size_t limit, void *info); | typedef size_t(*Func)(void *& buf, size_t limit, void *info); |
| Measure_reader(Func afunc, void *ainfo) : | Measure_reader(Func afunc, void *ainfo) : |
| Line 49 public: | Line 58 public: |
| chunk(0), offset(0), size(0) { | chunk(0), offset(0), size(0) { |
| } | } |
| size_t read(unsigned char *& buf, size_t limit) { | size_t read(void *&buf, size_t limit) { |
| if(offset+limit>size) // nothing left | if(offset+limit>size) // nothing left |
| if(offset==0 || limit==1) { // only one-byte continuations allowed | if(offset==0 || limit==1) { // only one-byte continuations allowed |
| size=(*func)(chunk, READ_CHUNK_SIZE, info); | size=(*func)(chunk, READ_CHUNK_SIZE, info); |
| Line 86 struct GIF_Header { | Line 95 struct GIF_Header { |
| char nulls; | char nulls; |
| }; | }; |
| /// JPEG file header | /// JPEG record head |
| struct JFIF_Header { | struct JPG_Segment_head { |
| char length[2]; //< length of JFIF segment marker | unsigned char marker; |
| char identifier[5]; //< JFIF identifier | unsigned char code; |
| char version[2]; //< version | unsigned char length[2]; |
| char units; //< units X of Y pixel density | |
| char xdensity[2]; //< X pixel density | |
| char ydensity[2]; //< X pixel density | |
| char xthumbnails; //< width of thumbnails | |
| char ythumbnails; //< height of thumbnails | |
| char reserved; //< reserved | |
| }; | }; |
| /// JPEG frame header | /// JPEG frame header |
| struct JPG_Frame { | struct JPG_Size_segment_body { |
| char length[2]; //< length of image marker | |
| char data; //< data precision of bits/sample | char data; //< data precision of bits/sample |
| char height[2]; //< image height | unsigned char height[2]; //< image height |
| char width[2]; //< image width | unsigned char width[2]; //< image width |
| char numComponents; //< number of color components | char numComponents; //< number of color components |
| }; | }; |
| // | // |
| inline short bytes_to_int(unsigned char HI, unsigned char LO) { | inline short x_endian_to_int(unsigned char L, unsigned char H) { |
| return(short)((HI<<8) + LO); | return(short)((H<<8) + L); |
| } | |
| inline short big_endian_to_int(unsigned char b[2]) { | |
| return x_endian_to_int(b[1], b[0]); | |
| } | |
| inline short little_endian_to_int(unsigned char b[2]) { | |
| return x_endian_to_int(b[0], b[1]); | |
| } | } |
| void measure_gif(Pool& pool, const String *origin_string, | void measure_gif(Pool& pool, const String *origin_string, |
| Measure_reader& reader, int& width, int& height) { | Measure_reader& reader, int& width, int& height) { |
| unsigned char *buf; | void *buf; |
| const int head_size=sizeof(GIF_Header); | const int head_size=sizeof(GIF_Header); |
| if(reader.read(buf, head_size)<head_size) | if(reader.read(buf, head_size)<head_size) |
| PTHROW(0, 0, | PTHROW(0, 0, |
| origin_string, | origin_string, |
| "broken GIF header - file size is less then %d bytes", head_size); | "not GIF file - too small"); |
| GIF_Header *head=(GIF_Header *)buf; | |
| GIF_Header& screenD=*reinterpret_cast<GIF_Header *>(buf); | if(strncmp(head->type, "GIF", 3)!=0) |
| if(strncmp(screenD.type, "GIF", 3)!=0) | |
| PTHROW(0, 0, | PTHROW(0, 0, |
| origin_string, | origin_string, |
| "bad image file - GIF signature not found"); | "not GIF file - signature not found"); |
| width=bytes_to_int(screenD.width[1], screenD.width[0]); | width=little_endian_to_int(head->width); |
| height=bytes_to_int(screenD.height[1], screenD.height[0]); | height=little_endian_to_int(head->height); |
| } | } |
| void measure_jpeg(Pool& pool, const String *origin_string, | void measure_jpeg(Pool& pool, const String *origin_string, |
| Measure_reader& reader, int& width, int& height) { | Measure_reader& reader, int& width, int& height) { |
| // JFIF format markers | // JFIF format markers |
| const unsigned char SOI=0xD8; | const unsigned char MARKER=0xFF; |
| const unsigned char EOI=0xD9; | const unsigned char CODE_SIZE_FIRST=0xC0; |
| const unsigned char APP0=0xE0; | const unsigned char CODE_SIZE_LAST=0xC3; |
| const unsigned char SOF0=0xC0; | |
| const unsigned char SOF2=0xC2; | |
| const unsigned char COM=0xFE; | |
| unsigned char *screenD_buf; | void *buf; |
| unsigned char *h_buf=0; | |
| bool flag=false; | |
| unsigned char *prefix; | |
| const size_t prefix_size=2; | const size_t prefix_size=2; |
| if(reader.read(prefix, prefix_size)<prefix_size) | if(reader.read(buf, prefix_size)<prefix_size) |
| PTHROW(0, 0, | PTHROW(0, 0, |
| origin_string, | origin_string, |
| "broken JPEG file - size is less then %d bytes", prefix_size); | "not JPEG file - too small"); |
| unsigned char *signature=(unsigned char *)buf; | |
| if(((unsigned char *)prefix)[1]!=SOI) | if(!(signature[0]==0xFF && signature[1]==0xD8)) |
| PTHROW(0, 0, | PTHROW(0, 0, |
| origin_string, | origin_string, |
| "broken JPEG file - second byte of header is not 0x%02X", SOI); | "not JPEG file - signature not found"); |
| unsigned char zero=0; | bool found=false; |
| unsigned char *marker=&zero; | while(true) { |
| void *buf; | |
| do { | // Extract the segment header. |
| while((*marker)!=0xFF) | if(reader.read(buf, sizeof(JPG_Segment_head))<sizeof(JPG_Segment_head)) |
| if(reader.read(marker, sizeof(char))<=0) break; | break; |
| if(reader.read(marker, sizeof(char))<=0) break; | JPG_Segment_head *head=(JPG_Segment_head *)buf; |
| switch(*marker) { | |
| case EOI: | // Verify that it's a valid segment. |
| marker=&zero; | if(head->marker!=MARKER) |
| break; | |
| case APP0: | |
| if(!flag) { | |
| flag=true; | |
| if(reader.read(screenD_buf, sizeof(JFIF_Header)) < sizeof(JFIF_Header)) | |
| break; | |
| JFIF_Header& screenD=*reinterpret_cast<JFIF_Header *>(screenD_buf); | |
| if((bytes_to_int(screenD.length[0], screenD.length[1]) < 16) || | |
| strcasecmp(screenD.identifier, "JFIF")) flag=false; | |
| } | |
| break; | break; |
| case SOF0: | |
| case SOF2: | if(head->code >= CODE_SIZE_FIRST && head->code <= CODE_SIZE_LAST) { |
| if(reader.read(h_buf, sizeof(JPG_Frame))<sizeof(JPG_Frame)) | // Segments that contain size info |
| flag=false; | if(reader.read(buf, sizeof(JPG_Size_segment_body))<sizeof(JPG_Size_segment_body)) |
| break; | |
| JPG_Size_segment_body *body=(JPG_Size_segment_body *)buf; | |
| width=big_endian_to_int(body->width); | |
| height=big_endian_to_int(body->height); | |
| found=true; | |
| break; | break; |
| default: break; | } else { |
| } | // Dummy read to skip over data |
| } while(*marker!=EOI); | size_t limit=big_endian_to_int(head->length) - 2; |
| if(reader.read(buf, limit)<limit) | |
| if(flag && h_buf) { | break; |
| JPG_Frame& h=*reinterpret_cast<JPG_Frame *>(h_buf); | } |
| width=bytes_to_int(h.width[0], h.width[1]); | } |
| height=bytes_to_int(h.height[0], h.height[1]); | |
| } else | if(!found) |
| PTHROW(0, 0, | PTHROW(0, 0, |
| origin_string, | origin_string, |
| "broken JPEG file - APP0 frame not found"); | "broken JPEG file - size frame not found"); |
| } | } |
| // measure center | // measure center |
| Line 310 static void _html(Request& r, const Stri | Line 309 static void _html(Request& r, const Stri |
| const Hash& fields=static_cast<VImage *>(r.self)->fields(); | const Hash& fields=static_cast<VImage *>(r.self)->fields(); |
| Hash *attribs=0; | Hash *attribs=0; |
| if(params->size()) | if(params->size()) { |
| if(attribs=params->get(0).get_hash()) { | Value &vattribs=params->get(0); |
| Attrib_info attrib_info={&tag, 0}; | if(vattribs.is_defined()) // allow 'void' |
| attribs->for_each(append_attrib_pair, &attrib_info); | if(Hash *attribs=vattribs.get_hash()) { |
| } else | Attrib_info attrib_info={&tag, 0}; |
| PTHROW(0, 0, | attribs->for_each(append_attrib_pair, &attrib_info); |
| &method_name, | } else |
| "attributes must be must be hash"); | PTHROW(0, 0, |
| &method_name, | |
| "attributes must be hash"); | |
| } | |
| Attrib_info attrib_info={&tag, attribs}; | Attrib_info attrib_info={&tag, attribs}; |
| fields.for_each(append_attrib_pair, &attrib_info); | fields.for_each(append_attrib_pair, &attrib_info); |
| Line 363 static void _load(Request& r, const Stri | Line 365 static void _load(Request& r, const Stri |
| static void _create(Request& r, const String& method_name, MethodParams *params) { | static void _create(Request& r, const String& method_name, MethodParams *params) { |
| Pool& pool=r.pool(); | Pool& pool=r.pool(); |
| int width=r.process(params->get(0)).as_int(); | int width=params->as_int(0, r); |
| int height=r.process(params->get(1)).as_int(); | int height=params->as_int(1, r); |
| int bgcolor_value=0xffFFff; | int bgcolor_value=0xffFFff; |
| if(params->size()>2) | if(params->size()>2) |
| bgcolor_value=r.process(params->get(2)).as_int(); | bgcolor_value=params->as_int(2, r); |
| gdImage& image=*new(pool) gdImage(pool); | gdImage& image=*new(pool) gdImage(pool); |
| image.Create(width, height); | image.Create(width, height); |
| image.FilledRectangle(0, 0, width-1, height-1, image.Color(bgcolor_value)); | image.FilledRectangle(0, 0, width-1, height-1, image.Color(bgcolor_value)); |
| Line 405 static void _line(Request& r, const Stri | Line 407 static void _line(Request& r, const Stri |
| "does not contain an image"); | "does not contain an image"); |
| image->Line( | image->Line( |
| r.process(params->get(0)).as_int(), | params->as_int(0, r), |
| r.process(params->get(1)).as_int(), | params->as_int(1, r), |
| r.process(params->get(2)).as_int(), | params->as_int(2, r), |
| r.process(params->get(3)).as_int(), | params->as_int(3, r), |
| image->Color(r.process(params->get(4)).as_int())); | image->Color(params->as_int(4, r))); |
| } | } |
| static void _fill(Request& r, const String& method_name, MethodParams *params) { | static void _fill(Request& r, const String& method_name, MethodParams *params) { |
| Line 422 static void _fill(Request& r, const Stri | Line 424 static void _fill(Request& r, const Stri |
| "does not contain an image"); | "does not contain an image"); |
| image->Fill( | image->Fill( |
| r.process(params->get(0)).as_int(), | params->as_int(0, r), |
| r.process(params->get(1)).as_int(), | params->as_int(1, r), |
| image->Color(r.process(params->get(2)).as_int())); | image->Color(params->as_int(2, r))); |
| } | } |
| static void _rectangle(Request& r, const String& method_name, MethodParams *params) { | static void _rectangle(Request& r, const String& method_name, MethodParams *params) { |
| Line 437 static void _rectangle(Request& r, const | Line 439 static void _rectangle(Request& r, const |
| "does not contain an image"); | "does not contain an image"); |
| image->Rectangle( | image->Rectangle( |
| r.process(params->get(0)).as_int(), | params->as_int(0, r), |
| r.process(params->get(1)).as_int(), | params->as_int(1, r), |
| r.process(params->get(2)).as_int(), | params->as_int(2, r), |
| r.process(params->get(3)).as_int(), | params->as_int(3, r), |
| image->Color(r.process(params->get(4)).as_int())); | image->Color(params->as_int(4, r))); |
| } | } |
| static void _bar(Request& r, const String& method_name, MethodParams *params) { | static void _bar(Request& r, const String& method_name, MethodParams *params) { |
| Line 454 static void _bar(Request& r, const Strin | Line 456 static void _bar(Request& r, const Strin |
| "does not contain an image"); | "does not contain an image"); |
| image->FilledRectangle( | image->FilledRectangle( |
| r.process(params->get(0)).as_int(), | params->as_int(0, r), |
| r.process(params->get(1)).as_int(), | params->as_int(1, r), |
| r.process(params->get(2)).as_int(), | params->as_int(2, r), |
| r.process(params->get(3)).as_int(), | params->as_int(3, r), |
| image->Color(r.process(params->get(4)).as_int())); | image->Color(params->as_int(4, r))); |
| } | } |
| static void _replace(Request& r, const String& method_name, MethodParams *params) { | static void _replace(Request& r, const String& method_name, MethodParams *params) { |
| Line 479 static void _replace(Request& r, const S | Line 481 static void _replace(Request& r, const S |
| gdImage::Point *p=(gdImage::Point *)pool.malloc(sizeof(gdImage::Point)*n); | gdImage::Point *p=(gdImage::Point *)pool.malloc(sizeof(gdImage::Point)*n); |
| for(int i=0; i<n; i++) { | for(int i=0; i<n; i++) { |
| p[i].x=r.process(params->get(2+i*2+0)).as_int(); | p[i].x=params->as_int(2+i*2+0, r); |
| p[i].y=r.process(params->get(2+i*2+1)).as_int(); | p[i].y=params->as_int(2+i*2+1, r); |
| } | } |
| image->FilledPolygonReplaceColor(p, n, | image->FilledPolygonReplaceColor(p, n, |
| image->Color(r.process(params->get(0)).as_int()), // src color | image->Color(params->as_int(0, r)), // src color |
| image->Color(r.process(params->get(1)).as_int()));// dest color | image->Color(params->as_int(1, r)));// dest color |
| } | } |
| static void _polygon(Request& r, const String& method_name, MethodParams *params) { | static void _polygon(Request& r, const String& method_name, MethodParams *params) { |
| Line 505 static void _polygon(Request& r, const S | Line 507 static void _polygon(Request& r, const S |
| gdImage::Point *p=(gdImage::Point *)pool.malloc(sizeof(gdImage::Point)*n); | gdImage::Point *p=(gdImage::Point *)pool.malloc(sizeof(gdImage::Point)*n); |
| for(int i=0; i<n; i++) { | for(int i=0; i<n; i++) { |
| p[i].x=r.process(params->get(1+i*2+0)).as_int(); | p[i].x=params->as_int(2+i*2+0, r); |
| p[i].y=r.process(params->get(1+i*2+1)).as_int(); | p[i].y=params->as_int(2+i*2+1, r); |
| } | } |
| image->Polygon(p, n, | image->Polygon(p, n, |
| image->Color(r.process(params->get(0)).as_int())); | image->Color(params->as_int(0, r))); |
| } | } |
| static void _polybar(Request& r, const String& method_name, MethodParams *params) { | static void _polybar(Request& r, const String& method_name, MethodParams *params) { |
| Line 530 static void _polybar(Request& r, const S | Line 532 static void _polybar(Request& r, const S |
| gdImage::Point *p=(gdImage::Point *)pool.malloc(sizeof(gdImage::Point)*n); | gdImage::Point *p=(gdImage::Point *)pool.malloc(sizeof(gdImage::Point)*n); |
| for(int i=0; i<n; i++) { | for(int i=0; i<n; i++) { |
| p[i].x=r.process(params->get(1+i*2+0)).as_int(); | p[i].x=params->as_int(2+i*2+0, r); |
| p[i].y=r.process(params->get(1+i*2+1)).as_int(); | p[i].y=params->as_int(2+i*2+1, r); |
| } | } |
| image->FilledPolygon(p, n, | image->FilledPolygon(p, n, |
| image->Color(r.process(params->get(0)).as_int())); | image->Color(params->as_int(0, r))); |
| } | } |
| // font | // font |
| Line 545 static void _polybar(Request& r, const S | Line 547 static void _polybar(Request& r, const S |
| class Font : public Pooled { | class Font : public Pooled { |
| public: | public: |
| int height; //< Font heigth | const static int letter_spacing; |
| int space; //< Default char width | int height; ///< Font heigth |
| int monospace; ///< Default char width | |
| int spacebarspace; ///< spacebar width | |
| gdImage& ifont; | gdImage& ifont; |
| const String& alphabet; | const String& alphabet; |
| Font(Pool& pool, | Font(Pool& pool, |
| const String& aalphabet, | const String& aalphabet, |
| gdImage& aifont, int aheight, int aspace) : Pooled(pool), | gdImage& aifont, int aheight, int amonospace, int aspacebarspace) : Pooled(pool), |
| alphabet(aalphabet), | alphabet(aalphabet), |
| height(aheight), space(aspace), | height(aheight), monospace(amonospace), spacebarspace(aspacebarspace), |
| ifont(aifont) { | ifont(aifont) { |
| } | } |
| Line 567 public: | Line 571 public: |
| int index_width(int index) { | int index_width(int index) { |
| if(index<0) | if(index<0) |
| index=index_of('.'); | return spacebarspace; |
| if(index<0) | |
| return 0; | |
| int tr=ifont.GetTransparent(); | int tr=ifont.GetTransparent(); |
| for(int x=ifont.SX()-1; x>0; x--) { | for(int x=ifont.SX()-1; x>=0; x--) { |
| for(int y=0; y<height-1; y++) | for(int y=0; y<height-1; y++) |
| if(ifont.GetPixel(x, Y(y))!=tr) | if(ifont.GetPixel(x, Y(y))!=tr) |
| return x+2; | return x+1; |
| } | } |
| return 0; | return 0; |
| } | } |
| Line 599 public: | Line 601 public: |
| if(cstr) for(; *cstr; cstr++) { | if(cstr) for(; *cstr; cstr++) { |
| int index=index_of(*cstr); | int index=index_of(*cstr); |
| index_display(image, x, y, index); | index_display(image, x, y, index); |
| x+=space ? space : index_width(index); | x+=letter_spacing + (monospace ? monospace : index_width(index)); |
| } | } |
| } | } |
| }; | }; |
| const int Font::letter_spacing=1; | |
| static void _font(Request& r, const String& method_name, MethodParams *params) { | static void _font(Request& r, const String& method_name, MethodParams *params) { |
| Pool& pool=r.pool(); | Pool& pool=r.pool(); |
| Value& valphabet=params->as_no_junction(0, "alphabet must not be code"); | const String& alphabet=params->as_string(0, "alphabet must not be code"); |
| Value& file_name=params->as_no_junction(1, "file_name must not be code"); | gdImage& image=*load(r, method_name, params->as_string(1, "file_name must not be code")); |
| int height=r.process(params->get(2)).as_int(); | int spacebar_width=params->as_int(2, r); |
| int monospace_width; | |
| int width=params->size()>3?r.process(params->get(3)).as_int():0; | if(params->size()>3) { |
| monospace_width=params->as_int(3, r); | |
| if(!monospace_width) | |
| monospace_width=image.SX(); | |
| } else | |
| monospace_width=0; | |
| if(!alphabet.size()) | |
| PTHROW(0, 0, | |
| &method_name, | |
| "alphabet must not be empty"); | |
| static_cast<VImage *>(r.self)->font=new(pool) Font(pool, | static_cast<VImage *>(r.self)->font=new(pool) Font(pool, |
| valphabet.as_string(), | alphabet, |
| *load(r, method_name, file_name.as_string()), | image, |
| height, width); | image.SY() / alphabet.size(), monospace_width, spacebar_width); |
| } | } |
| static void _text(Request& r, const String& method_name, MethodParams *params) { | static void _text(Request& r, const String& method_name, MethodParams *params) { |
| Pool& pool=r.pool(); | Pool& pool=r.pool(); |
| int x=r.process(params->get(0)).as_int(); | int x=params->as_int(0, r); |
| int y=r.process(params->get(1)).as_int(); | int y=params->as_int(1, r); |
| const String& s=r.process(params->get(2)).as_string(); | const String& s=params->as_string(2, "text must not be code"); |
| VImage& vimage=*static_cast<VImage *>(r.self); | VImage& vimage=*static_cast<VImage *>(r.self); |
| if(vimage.image) | if(vimage.image) |
| Line 684 MImage::MImage(Pool& apool) : Methoded(a | Line 698 MImage::MImage(Pool& apool) : Methoded(a |
| // ^image.polybar(color)(x;y)... point coord pairs | // ^image.polybar(color)(x;y)... point coord pairs |
| add_native_method("polybar", Method::CT_DYNAMIC, _polybar, 1+3*2, 1+100*2); | add_native_method("polybar", Method::CT_DYNAMIC, _polybar, 1+3*2, 1+100*2); |
| // ^image.font[alPHAbet;font-file-name.gif](height) | // ^image.font[alPHAbet;font-file-name.gif](spacebar_width) |
| // ^image.font[alPHAbet;font-file-name.gif](height;width) | // ^image.font[alPHAbet;font-file-name.gif](spacebar_width;width) |
| add_native_method("font", Method::CT_DYNAMIC, _font, 3, 4); | add_native_method("font", Method::CT_DYNAMIC, _font, 3, 4); |
| // ^image.text(x;y)[text] | // ^image.text(x;y)[text] |