Graphics Device Context. More...
#include <libemf.h>
Public Member Functions | |
| METAFILEDEVICECONTEXT (FILE *fp_, const RECT *size, LPCWSTR description_w) | |
| virtual | ~METAFILEDEVICECONTEXT () |
| OBJECTTYPE | getType (void) const |
| DWORD | nextHandle (void) |
| void | clearHandle (DWORD handle) |
| void | appendRecord (METARECORD *record) |
| void | appendHandle (METARECORD *record) |
| void | deleteMetafile (void) |
| void | mergePoint (const LONG &x, const LONG &y) |
| void | mergePoint (const POINT &p) |
Public Attributes | |
| ::FILE * | fp |
| DATASTREAM | ds |
| ENHMETAHEADER * | header |
| std::vector< EMF::METARECORD * > | records |
| SIZEL | resolution |
| The resolution in DPI of the *reference* DC. | |
| SIZEL | viewport_ext |
| The extent of the viewport. | |
| POINT | viewport_org |
| The origin of the viewport. | |
| SIZEL | window_ext |
| The extent of the window. | |
| POINT | window_org |
| The origin of the window. | |
| bool | update_frame |
| Update the frame automatically? | |
| POINT | min_device_point |
| The lft/top-most painted point in device units. | |
| POINT | max_device_point |
| The rgt/btm-most painted point in device units. | |
| POINT | point |
| The current point. | |
| PEN * | pen |
| The current pen. | |
| BRUSH * | brush |
| The current brush. | |
| FONT * | font |
| The current font. | |
| PALETTE * | palette |
| The current palette. | |
| UINT | text_alignment |
| The current text alignment. | |
| COLORREF | text_color |
| The current text foreground color. | |
| COLORREF | bk_color |
| The current background color. | |
| INT | bk_mode |
| The current background mode. | |
| INT | polyfill_mode |
| The current polygon fill mode. | |
| INT | map_mode |
| The current mapping mode. | |
| FLOAT | miter_limit |
| The current miter length limit. | |
| std::vector< bool > | handles |
| std::map< HGDIOBJ, HGDIOBJ > | emf_handles |
Detailed Description
Graphics Device Context.
Almost all GDI graphics calls require a device context (except those which create graphics objects such as pens and fonts). This is a specific context which renders to a metafile. There is a one-to-one correspondence between the device context and the metafile.
Constructor & Destructor Documentation
| EMF::METAFILEDEVICECONTEXT::METAFILEDEVICECONTEXT | ( | FILE * | fp_, |
| const RECT * | size, | ||
| LPCWSTR | description_w | ||
| ) | [inline] |
Most graphics programs seem to want to handle the opening and closing of files themselves, so this is an extension to the w32 interface.
- Parameters:
-
fp_ stdio pointer to an open file. May be null. size the rectangle describing the position and size of the metafile on the "page". May be null. description_w a UNICODE string describing the metafile. The format must be "some text\0some more text\0\0". May be null.
| virtual EMF::METAFILEDEVICECONTEXT::~METAFILEDEVICECONTEXT | ( | ) | [inline, virtual] |
Destructor frees all the graphics objects which may have been allocated. Now, it also frees any metarecords which it might hold, too.
Member Function Documentation
| void EMF::METAFILEDEVICECONTEXT::appendHandle | ( | METARECORD * | record | ) | [inline] |
Add this record to the metafile.
- Parameters:
-
record this record is an object so it increments the handle count as well.
| void EMF::METAFILEDEVICECONTEXT::appendRecord | ( | METARECORD * | record | ) | [inline] |
Add this record to the metafile.
- Parameters:
-
record standard graphics record
| void EMF::METAFILEDEVICECONTEXT::clearHandle | ( | DWORD | handle | ) | [inline] |
Clear the usage of this handle
| void EMF::METAFILEDEVICECONTEXT::deleteMetafile | ( | void | ) | [inline] |
Delete all the records from the metafile. This would seem to include deleting the header record as well.
| OBJECTTYPE EMF::METAFILEDEVICECONTEXT::getType | ( | void | ) | const [inline, virtual] |
Return the type of this object (could probably do better with RTTI()).
Implements EMF::OBJECT.
| void EMF::METAFILEDEVICECONTEXT::mergePoint | ( | const LONG & | x, |
| const LONG & | y | ||
| ) | [inline] |
Somewhat superfluous, except checker doesn't understand the initialization of automatic structures in the declaration.
| void EMF::METAFILEDEVICECONTEXT::mergePoint | ( | const POINT & | p | ) | [inline] |
Take the given point and determine if it enlarges the "painted" area of the device.
| DWORD EMF::METAFILEDEVICECONTEXT::nextHandle | ( | void | ) | [inline] |
Scan the bit vector of used handles and return the index of the first free bit as this objects metafile handle.
Member Data Documentation
All i/o to the metafile is wrapped by this class so that byte swapping on big-endian machines is transparent.
| std::map< HGDIOBJ, HGDIOBJ > EMF::METAFILEDEVICECONTEXT::emf_handles |
This map holds the *current* mapping between EMF handles and global object handles as a metafile is played back (with PlayEnhMetaFile).
| ::FILE* EMF::METAFILEDEVICECONTEXT::fp |
If it is a file-based metafile, then this pointer is not null.
| std::vector< bool > EMF::METAFILEDEVICECONTEXT::handles |
For compatibility, it appears that metafile handles are reused as objects are deleted. Attempt to emulate that behavior with a bit vector of used metafile handles.
Serves double duty as the physical device description.
| std::vector< EMF::METARECORD* > EMF::METAFILEDEVICECONTEXT::records |
All of the metafile records are stored in memory.
The documentation for this class was generated from the following file:
