
history
-------------------------


v8.3
	- fixed CreateDirectDrawHandle(). when the input and
	  output dimensions were the same, this function returned
	  NULL instead of a valid directdrawhandle.
	
	- added support for texture-mapping and rotating while
	  drawing (no additional buffers required). currently
	  not documented and for internal use only.
	
	- added env variable guigfx/USEWPA8. it is used when the
	  drawhandle is on a native Amiga screenmode. when set to
	  "0", guigfx.library will use an internal c2p routine.
	  when set to "1", guigfx.library will call WritePixelArray8(),
	  WritePixelLine8() or WriteChunkyPixels().

v8.2
	- 12bit (default) drawhandles now use mapping-engines for
	  optimized rendering to static palettes (no pen-sharemap
	  specified for ObtainDrawHandle()). this is preliminary,
	  for test purposes only.
	
	- fixed PICMTHD_INSERT to support insertion of pictures
	  which are both mapped to the same drawhandle. untested yet.

v8.1
	- to end up problems with cybergraphics.library/ScalePixelArray(),
	  I've included an ENV variable named guigfx/USESCALEPIXELARRAY
	  so that the user may decide. Default is "0", and
	  guigfx.library/DrawPicture() uses its internal scaling
	  routines. DirectDrawTrueColor() always uses ScalePixelArray()
	  with cgfx v41 present.

v8.0
	- added CreateDirectDrawHandle(), DeleteDirectDrawHandle()
	  and DirectDrawTrueColor() for optimized drawing of
	  RGB data.

	- wowsers, cybergraphics.library/scalepixelarray() seems
	  to get faster and buggier with every new cybergraphics
	  update. i wonder if the authors still know what's going
	  on inside? anyway, i can't really decide whether to use
	  it or not. currently, DirectDrawTrueColor() uses it for
	  higher performance, and DrawPicture() doesn't for
	  accurate scaling without flicker.

v7.2
	- applied Tower JPEG Class license agreements to the
	  legal informations.

	- If you want to use the Tower JPEG codec, your program
	  has to be in accordance to the respective license
	  agreements. Specify the tag GGFX_License for
	  IsPicture() and LoadPicture() to use the JPEG codec.
	  Otherwise, datatypes are used.

v7.1
	- added picture mehtods PICMTHD_FLIPX and PICMTHD_FLIPY.

v7.0
	- added picture method PICMTHD_INSERT.

v6.2
	- improved drawing speed with OS3.0

v6
	- ClonePicture() now handles scaling.
	- minor changes and speed improvements.
	- JPEG is the first file format to be supported
	  directly. LoadPicture() uses the tower.library
	  JPEG codec if available. directly supported
	  formats require less memory while loading.

v5
	- added method PICMTHD_TINTALPHA

v4.4
	- since v4.3, ObtainDrawHandle() crashed on screens with
	  no sharable pens. fixed.
	- if render.library cannot be found in LIBS:,
	  guigfx.library now tries to open it at libs/.
	- IsPicture() no longer crashes without datatypes.library.

v4.3
	- improved logic in ObtainDrawHandle() for
	  truecolor-rastports and pensharemap=NULL
	- updated autodocs.
	- Calls to ScalePixelArray()/cybergraphics v41 have been
	  removed. Instead, a 24bit render.library scaling-engine
	  is used. ScalePixelArray() is too slow (especially with
	  large images), does not scale correctly, causes
	  flickering, and cannot be interrupted.
	- fixed PICMTHD_SET with pictures mapped to a drawhandle.
	- added tags GGFX_SourceWidth, GGFX_SourceHeight, 
	  GGFX_SourceX und GGFX_SourceY to ClonePicture(). It's
	  now possible to clone a picture in part.
	- fixed a minor bug in MakePicture().
	- MakePicture() now accpets NULL as the palette argument
	  for PIXFMT_CHUNKY_CLUT, in which case a grey palette
	  with 256 entries will be generated.

v4.2
	- DrawPicture() did not set a correct return value under
	  rare circumstances. fixed.
	- pictures now cache their last scaling-engine.
	- DrawPicture() is now guaranteed to execute the line hook
	  at least once per call.

v4.1
	- the functions LockPicture() and UnlockPicture() are now
	  considered 'obsolete'. Calling LockPicture() will always
	  return FALSE, and UnlockPicture() will do nothing.
	  
	  Please remove these functions from your code and replace
	  them with a call to DoPictureMethod() with
	  PICMTHD_MAPDRAWHANDLE if you need optimized rendering.

	  The idea behind LockPicture() wasn't too bad, but currently
	  it is not possible to implement it properly. LockPicture()
	  and UnlockPicture() will no longer be documented, but the
	  LVOs remain valid and might be reactivated some day. Calling
	  these functions in already existing code is harmless.

v4.00
	- implemented IsPicture()

v3.11
	- fixed several memory management problems with LoadPicture().

v3.10
	- fixed a heavy bug leading to memory corruptions, especially
	  when drawing to native Amiga screen modes.
	
v3.03
	- MakePictureA() now accepts NULL as a data pointer. This
	  will create a 'blank' picture with the specified
	  attributes.
	- ObtainDrawHandleA() now accepts NULL for the pensharemap
	  argument. In this case ObtainDrawHandle creates a drawhandle
	  with a static 9bit colorspace palette.
	- MakePictureA() now accepts a NULL palette for PIXFMT_CHUNKY_CLUT.
	  This will create a default-palette (256 colors from black to white)
	- drawing to bitplanes without scaling is now performed
	  via Chunky2BitMap/BltBitMapRastPort.
	- implemented PICMTHD_SET.
	- fixed lots of bugs in internal picture conversion routines.

v3.02
	- guigfx.library no longer depends on datatypes.library v40.
	  the minimum version number is reset to v39.
	- implemented PICMTHD_TEXTURE.
	- bumped revision number for render.library to v25.

v3.01
	- fixed a minor bug in LockPictureA().
	- added documentation for LockPictureA() and UnLockPicture().
	- added a workaround for INVALID_ID originating from
	  PDTA_ModeID. INVALID_ID returned by a datatype appears
	  neither logical nor legal to me. anyway, guigfx.library
	  no longer crashes with HAM8 pictures loaded by the ILBM v43
	  datatype in an ECS/OCS environment. however, the images still
	  appear scrambled, since guigfx.library cannot determine whether
	  to treat an image as HAM8 or not.

v3.00
	- Some more tags implemented.
	- the autodocs have been reworked.
	- the internal memhandler has been reset to RMHTYPE_POOL.
	- implemented LockPicture() and UnlockPicture().
	- color allocation strategy improved.
	- datatypes.Library is no longer required for guigfx.library
	  to be opened successfully.

v2.01
	- fixed GGFX_SourceX / GGFX_SourceY when drawing truecolor data to
	  truecolor rastports without scaling. Thanks to M. Hillenbrand
	  who reported this obstinate bug.

v2.00
	- fixed some internal histogram-related quirks and problems.
	  the resolution of a picture's histogram is now by default the
	  pensharemap's resolution it is being added to. if no
	  pensharemap is involved, then the histogram's resolution
	  will be set to the default resolution (currently HSTYPE_12BIT_TURBO).
	  You may as well set GGFX_HSType for LoadPicture(), MakePicture(),
	  and ReadPicture(), but this is not required under normal
	  circumstances. Better set the desired resolution when calling
	  CreatePenShareMap().
	- guigfx.library no longer crashes with old versions of
	  render.library. Now it closes down gently (It seems as I was
	  completely brain-dead when I wrote the setup routine)
	- autodocs now reflect all new tags and methods.

v1.99
	- since the autodither value cannot be computed when rendering
	  to HAM screen modes, HAM dithering is always enabled with
	  autodither != 0 and disabled with autodither==0.
	- fixed documentation of AddPaletteA() and fixed a bug in
	  AddPalette() / PALFMT_RGB32. Thanks to Frank Pagels who
	  reported these problems.
	- added picture method PICMTHD_TINT.
	- guigfx.library no longer tries to open Cybergraphics.library
	  v41. The code now correctly differentiates for ScalePixelArray()
	  and custom scaling routines. Thanks to M. Hillenbrand and
	  S. Sommerfeld who reported this bug.

v1.98
	- drawing/scaling truecolor to truecolor drawing is now
	  done with ScalePixelArray/cybergraphics.library which
	  isn't as slow as I expected. It can stand the test
	  with a render.library scaling-engine plus line-by-line
	  drawing, and it requires no additional memory.
	- The code now differenciates graphics v40 for drawing to
	  graphic card rastports via WriteChunkyPixels().

v1.97
	- guigfx.library now tries to convert chunky pictures to
	  truecolor before drawing to HAM modes. if conversion
	  fails (i.e. with the picture in a static buffer), the
	  image will be drawn with the 16/64 HAM base colors.

v1.96
	- fixed a minor bug that occured when drawing odd-width
	  pictures in directdraw mode.
	- guigfx.library now renders to HAM modes. Currently the
	  full HAM spectrum is only used with truecolor pictures.
	  When ObtainDrawHandle() is supplied with GGFX_ModeID, 
	  then HAM is automatically recognized and used.

v1.95
	- removed a workaround for an incompatibility problem
	  between the cybergraphx and picasso96 picture.datatypes.
	  loading is faster now and requires less memory. this
	  update requires the picasso96 picture.class datatype
	  v43.26.
	- revised autodocs and completed the documentation for
	  the picture method PICMTHD_CREATEALPHAMASK.

v1.94
	- fixed a overlap-memcopy bug in PICMTHD_CROP. You need to
	  upgrade to render.library v22.1.

v1.93
	- improved alpha-channel handling. PICMTHD_MIXALPHA
	  now handles alpha-channels in both the source and
	  destination picture (if present).
	- implemented PICMTHD_CREATEALPHAMASK.
	- added E includes

v1.92
	- fixed bug in DoPictureMethod: certain internal format
	  conversions lead to crashes since v1.7.
	- implemented PICMTHD_RENDER with destination format
	  PIXFMT_RGB_24.
	- completed alpha-channel administration. an alpha-channel
	  is no longer discarded when the internal pixel format
	  changes.
	- implemented GGFX_AlphaPresent for MakePicture()

v1.9
	- rewrote all drawing routines. the code is more
	  differentiated for optimized drawing.
	- autodither fixed. finally this feature works as
	  it was originally intended to.
	- Fixed v1.8 bug when drawing to truecolor screens.
	- implemented GGFX_DitherMode for DrawPicture() and
	  CreatePictureBitMap(). They may be used to optionally
	  override the drawhandle's dithermode.
	- Note: guigfx.library v1.9 requires render.library v21.
	- implemented GGFX_AspectX and GGFX_AspectY to
	  MakePicture().

v1.8
	- ObtainDrawHandle() no longer allocates pens for
	  truecolor rastports. Thanks to Stefan Sommerfeld
	  who reported this bug.
	- GGFX_SourceWidth and GGFX_SourceHeight were not
	  correctly implemented for CreatePictureBitMap()
	- fixed minor memory transfer problems: TurboCopyMem()
	  was sometimes applied to odd-sized memory areas
	- implemented GGFX_BufferSize for MakePicture()

v1.7
	- a picture has no longer to be maintained for an open
	  colorhandle. with other words: you may DeletePicture()
	  a picture after it has been added to a pensharemap via
	  AddPicture().
	- implemented GGFX_MaxAllocPens for ObtainDrawHandle().
	  This limits the number of allocated pens to a specific
	  number. Better you use this feature only if you've got
	  a very good reason for it.
	- math problems fixed. GGFX_Weight should work now. a better
	  color allocation strategy has been implemented.
	  Currently use GGFX_Weight in a range from 1-10. Maybe
	  I will implement a more sophisticated measurement later.
	- internal color allocation order is now PALMODE_SATURATION
	  instead of PALMODE_SIGNIFICANCE. this improves color
	  allocation speed drastically.
	- drawhandles no longer maintain a global mapping-engine.
	  this saves some memory and is remarkably faster in many
	  situations, since the mapping-engine could not be linked
	  to the drawhandle's histogram.

v1.6
	- implemented GGFX_ErrorCode for LoadPicture(). You specify
	  a pointer to LONG, and a standard DOS error code will be
	  returned (NULL when everything was OK).

v1.5
	- LoadPicture() did not always handle v43 bitmaps correctly.
	  Fixed. Thanks to Markus Hillenbrand who reported this bug.
	- guigfx.library's global memhandler is reset to RMHTYPE_PUBLIC
	  for debugging, since public memory violations can be
	  tracked down more easily.
	- fixed PICMTHD_MIXALPHA with the source picture in
	  PIXFMT_CHUNKY_CLUT
	- added PICATTR_AspectX and PICATTR_AspectY to GetPictureAttrs()

v1.4	- fixed minor autodither bug.
	- GGFX_CallBackHook implemented for CreatePictureBitMap.
	- the autodither calculation is now invoked only for rastports
	  with a depth <= 8

v1.3
	- added GGFX_DitherMode to CreatePictureBitMap()
	- added GGFX_DestWidth, DestHeight, DestX and DestY to
	  method PICMTHD_MIXALPHA and PICMTHD_SETALPHA.
	  added GGFX_DestWidth, DestHeight, DestX, DestY, SourceX,
	  SourceY, SourceWidth, SourceHeight to method PICMTHD_MIX.
	  after all, DoPictureMethod() can apply clip regions of alpha
	  channel data to regions inside the picture, with automatic
	  scaling when necessary.
	- cleaned up all drawing routines.
	- GGFX_CallBackHook implemented for DrawPicture.

v1.2
	- fixed a bug in ClonePicture(). When a cloned picture was
	  deleted after the original, a memhandler-failure occured
	  (leading to an ILLEGAL exception in render.library)
	- fixed a bug in LoadPicture() - eliminated calls to IoErr().
	  dos.library is not part of guigfx.library. this fixes
	  crashes with unknown datatype objects or load errors.
	- guigfx.library now uses a global memhandler with RMHTYPE_POOL
	  and MEMF_REVERSE.
	- implemented GGFX_SourceWidth, GGFX_SourceHeight, GGFX_SourceX
	  and GGFX_SourceY for DrawPicture(). Now you can easily specify
	  offsets.

v1.1
	- fixed a heavy bug when drawing to native Amiga screen modes.


v1.0
	- first internal beta release.

