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TABLE OF CONTENTS guigfx.library/AddPaletteA guigfx.library/AddPictureA guigfx.library/AddPixelArrayA guigfx.library/ClonePictureA guigfx.library/CreateDirectDrawHandleA guigfx.library/CreatePenShareMapA guigfx.library/CreatePictureBitMapA guigfx.library/CreatePictureMaskA guigfx.library/DeleteDirectDrawHandle guigfx.library/DeletePenShareMap guigfx.library/DeletePicture guigfx.library/DirectDrawTrueColorA guigfx.library/DoPictureMethodA guigfx.library/DrawPictureA guigfx.library/GetPictureAttrsA guigfx.library/IsPictureA guigfx.library/LoadPictureA guigfx.library/LockPictureA guigfx.library/MakePictureA guigfx.library/ObtainDrawHandleA guigfx.library/ReadPictureA guigfx.library/ReleaseDrawHandle guigfx.library/RemColorHandle guigfx.library/UnLockPicture guigfx.library/AddPaletteA guigfx.library/AddPaletteA NAME AddPaletteA - add a palette's colors to a pen-sharemap. AddPalette - varargs stub for AddPaletteA. SYNOPSIS colorhandle = AddPaletteA(psm,palette,taglist) d0 a0 a1 a2 APTR AddPaletteA(APTR,APTR,struct TagItem *) APTR AddPalette(APTR,APTR,tag,...,TAG_DONE) FUNCTION This function adds a palette's colors to a pen-sharemap. INPUTS psm - pointer to a pen-sharemap palette - pointer to a color table tags - pointer to an array of TagItems TAGS GGFX_PaletteFormat (ULONG) - format of the palette. Currently defined are: PALFMT_RGB8 ULONG 0x00rrggbb PALFMT_RGB32 ULONG red,green,blue. This is the LoadRGB32() format without trailing longword. Default: PALFMT_RGB8 GGFX_NumColors (ULONG) - number of colors in the color table. Currently, this argument is mandatory. Default: 0 GGFX_Weight (ULONG) - weight factor. Valid range: 1...255. With this factor, you can specify a significance for this color instance. The higher this value, the higher the palette's influence on the pen-sharemap. Default: 1 RESULTS colorhandle - identifier for a particular dependency between color information and pen-sharemap. there is no need for you to store a colorhandle, unless you want to manually remove it from the pen-sharemap via RemColorHandle(). NULL if something went wrong. NOTES An example is provided with the documentation for AddPictureA(). SEE ALSO RemColorHandle(), AddPictureA(), AddPixelArrayA(), CreatePenShareMapA(), DeletePenShareMap(), ObtainDrawHandleA() guigfx.library/AddPictureA guigfx.library/AddPictureA NAME AddPictureA - add a picture's color information to a pen-sharemap. AddPicture - varargs stub for AddPictureA. SYNOPSIS colorhandle = AddPictureA(psm,picture,taglist) d0 a0 a1 a2 APTR AddPictureA(APTR,APTR,struct TagItem *) APTR AddPicture(APTR,APTR,tag,...,TAG_DONE) FUNCTION This function adds a picture's color information to a pen-sharemap. INPUTS psm - pointer to a pen-sharemap picture - pointer to a picture tags - pointer to an array of TagItems TAGS GGFX_Weight (ULONG) - weight factor. Valid range: 1...255. With this factor, you can specify a significance for this color instance. The higher this value, the higher the picture's influence on the pen-sharemap. Default: 1 RESULTS colorhandle - identifier for a particular dependency between color information and pen-sharemap. there is no need for you to store a colorhandle, unless you want to manually remove it from the pen-sharemap via RemColorHandle(). NULL if something went wrong. EXAMPLE Assume there were three different pictures to be drawn. a) a noisy background b) a logo of your company c) navigation icons you might want to differenciate the significances for these pictures as follows: AddPicture(psm, backpic, GGFX_Weight, 2, TAG_DONE); AddPicture(psm, logopic, GGFX_Weight, 3, TAG_DONE); AddPicture(psm, navpic, GGFX_Weight, 5, TAG_DONE); the backpic's influence on the allocated pens would be 20%, the logo contributed with 30%, and the navigation buttons would be taken into account with 50% then. NOTES SEE ALSO RemColorHandle(), AddPaletteA(), AddPixelArrayA(), CreatePenShareMapA(), DeletePenShareMap(), ObtainDrawHandleA() guigfx.library/AddPixelArrayA guigfx.library/AddPixelArrayA NAME AddPixelArrayA - add a pixel array's color information to a pen-sharemap. AddPixelArray - varargs stub for AddPixelArrayA. SYNOPSIS colorhandle = AddPixelArrayA(psm,array,width,height,taglist) d0 a0 a1 d0 d1 a2 APTR AddPixelArrayA(APTR,APTR,UWORD,UWORD,struct TagItem *) APTR AddPixelArray(APTR,APTR,UWORD,UWORD,tag,...,TAG_DONE) FUNCTION This function adds a pixel array's color information to a pen-sharemap. INPUTS psm - pointer to a pen-sharemap pixelarray - pointer to a pixel array width - pixel array's width [pixels] height - pixel array's height [rows] tags - pointer to an array of TagItems TAGS GGFX_PixelFormat (ULONG) - pixel format. Currently defined are PIXFMT_CHUNKY_CLUT chunky bytes, directly acting as indices to a color-lookup-table. You must specify the GGFX_Palette and GGFX_NumColors tags as well. PIXFMT_0RGB_32 truecolor pixels (ULONG 0x00rrggbb). Default: PIXFMT_CHUNKY_CLUT GGFX_Palette (APTR) - pointer to a color table. Mandatory for PIXFMT_CHUNKY_CLUT (see above). Default: none GGFX_NumColors (ULONG) - number of colors in the color table. Mandatory for PIXFMT_CHUNKY_CLUT (see above). Default: none GGFX_PaletteFormat (ULONG) - format of the palette. Currently defined are: PALFMT_RGB8 ULONG 0x00rrggbb PALFMT_RGB32 ULONG red,green,blue. This is the LoadRGB32() format without trailing longword. Default: PALFMT_RGB8 GGFX_Weight (ULONG) - weight factor. Valid range: 1...255. With this factor, you can specify a significance for this color instance. The higher this value, the higher the pixel array's influence on the pen-sharemap. Default: 1 RESULTS colorhandle - identifier for a particular dependency between color information and pen-sharemap. there is no need for you to store a colorhandle, unless you want to manually remove it from the pen-sharemap via RemColorHandle(). NULL if something went wrong. NOTES An example is provided with the documentation for AddPictureA(). SEE ALSO RemColorHandle(), AddPaletteA(), AddPictureA(), CreatePenShareMapA(), DeletePenShareMap(), ObtainDrawHandleA() guigfx.library/ClonePictureA guigfx.library/ClonePictureA NAME ClonePictureA - create a duplicate from a picture. ClonePicture - varargs stub for ClonePictureA. SYNOPSIS newpicture = ClonePictureA(picture,taglist) d0 a0 a1 APTR ClonePictureA(APTR,struct TagItem *) APTR ClonePicture(APTR,tag,...,TAG_DONE) FUNCTION This function creates a duplicate from a picture. Memory will be allocated, and the picture will be copied including all its attributes. Optionally, the picture is cloned only in part. INPUTS picture - pointer to a picture tags - pointer to an array of TagItems TAGS GGFX_SourceX (ULONG) left edge inside the picture where to fetch the pixels from [pixels]. Default: 0. GGFX_SourceY (ULONG) top edge inside the picture where to fetch the pixels from [rows]. Default: 0. GGFX_SourceWidth (ULONG) width of an area inside the picture [pixels]. Default: The picture's width. GGFX_SourceHeight (ULONG) height of an area inside the picture [rows]. Default: The picture's height. GGFX_DestWidth (ULONG) width of the new picture [pixels]. Default: The picture's width. GGFX_DestHeight (ULONG) height of the new picture [rows]. Default: The picture's height. RESULTS newpicture - a vanilla copy of the specified picture (or a part of it), or NULL if there was not enough memory available. SEE ALSO MakePictureA(), DeletePicture() guigfx.library/CreateDirectDrawHandleA guigfx.library/CreateDirectDrawHandleA NAME CreateDirectDrawHandleA - derive a handle for 'direct' drawing (v9) CreateDirectDrawHandle - varargs stub for CreateDirectDrawHandleA SYNOPSIS ddh = CreateDirectDrawHandleA(drawhandle,sourcewidth,sourceheight, a0 d0 d1 destwidth,destheight,taglist) d2 d3 a1 APTR CreateDirectDrawHandleA(APTR,UWORD,UWORD,UWORD,UWORD, struct TagItem *) APTR CreateDirectDrawHandle(APTR,UWORD,UWORD,UWORD,UWORD, Tag,...,TAG_DONE) FUNCTION Derive a handle from a drawhandle for highly optimized ('direct') drawing function calls. Currently only truecolor data (PIXFMT_0RGB_32) are supported. INPUTS drawhandle - drawhandle from which to derive a directdrawhandle sourcewidth - source width [pixels] sourceheight - source height [rows] destwidth - dest width [pixels] destheight - dest height [rows] tags - pointer to an array of TagItems TAGS GGFX_PixelFormat - type of pixels to be processed. Currently only PIXFMT_0RGB_32 is supported. Default: PIXFMT_0RGB_32 RESULTS ddh - a direct-drawhandle, an object that can be passed to DirectDrawTrueColorA() NOTES You must free the direct-drawhandle with a matching call to DeleteDirectDrawHandle(). You are not allowed to free the underlying drawhandle before the direct-drawhandle. The consequences might be fatal. SEE ALSO DeleteDirectDrawHandle(), DirectDrawTrueColorA(), ObtainDrawHandleA() guigfx.library/CreatePenShareMapA guigfx.library/CreatePenShareMapA NAME CreatePenShareMapA - create a screen-pen manager. CreatePenShareMap - varargs stub for CreatePenShareMapA. SYNOPSIS psm = CreatePenShareMapA(taglist) d0 a0 APTR CreatePenShareMapA(struct TagItem *) APTR CreatePenShareMap(tag,...,TAG_DONE) FUNCTION This function creates a screen-pen manager. INPUTS tags - pointer to an array of TagItems TAGS GGFX_HSType (ULONG) - internal histogram type, according to the histogram types defined in render/render.h. Better you never touch this tag, unless you know exactly what you are doing. Also consider reading the 'memory' text file supplied with the render.library distribution. Default: HSTYPE_12BIT_TURBO RESULTS psm - a pen-sharemap ready for usage or NULL if there was not enough memory available. NOTES The term 'pen-sharemap' might be confusing and has been maintained for consistency reasons. It is actually a histogram that collects color statistics. When a pen-sharemap is passed to ObtainDrawHandleA(), it allows to calculate a very specific palette. SEE ALSO DeletePenShareMap(), ObtainDrawHandleA(), AddPictureA(), AddPaletteA(), AddPixelArrayA() guigfx.library/CreatePictureBitMapA guigfx.library/CreatePictureBitMapA NAME CreatePictureBitMapA - create a BitMap from a picture. CreatePictureBitMap - varargs stub for CreatePictureBitMapA. SYNOPSIS bitmap = CreatePictureBitMapA(drawhandle,picture,tags) d0 a0 a1 a2 struct BitMap *CreatePictureBitMapA(APTR,APTR,struct TagItem *) struct BitMap *CreatePictureBitMap(APTR,APTR,tag,...,TAG_DONE) FUNCTION This function creates a BitMap from a drawhandle and from a picture. This BitMap will be applicable to the drawhandle's RastPort and ColorMap, i.e. it may use colors allocated with the drawhandle, and can be blitted efficiently to the RastPort with graphics.library functions. If the picture argument is ommitted (i.e. NULL), then this function creates a blank, displayable BitMap that can be blitted efficiently to the drawhandle's RastPort. Note: The tags GGFX_DestWidth and GGFX_DestHeight are mandatory if no picture is specified, and all other tags will be ignored. (v15) Note: The BitMap structure must be freed with graphics.library/FreeBitMap(). INPUTS drawhandle - pointer to a drawhandle from ObtainDrawHandleA() picture - pointer to a picture, or NULL. tags - pointer to an array of TagItems TAGS GGFX_DestWidth (ULONG) destination width for the BitMap [pixels]. Mandatory if no picture is supplied. Default: the picture's width. GGFX_DestHeight (ULONG) destination height for the BitMap [rows]. Mandatory if no picture is supplied. Default: the picture's height. GGFX_SourceX (ULONG) left edge inside the picture where to fetch the pixels from [pixels]. Default: 0. GGFX_SourceY (ULONG) top edge inside the picture where to fetch the pixels from [rows]. Default: 0. GGFX_SourceWidth (ULONG) width of an area inside the picture [pixels]. Default: The picture's width. GGFX_SourceHeight (ULONG) height of an area inside the picture [rows]. Default: The picture's height. GGFX_CallBackHook (struct Hook *) pointer to a callback Hook structure. The associated callback function will be called from time to time while the picture is being rendered to the BitMap. The callback has to return TRUE for continuation or FALSE for abortion. It will be submitted a pointer to the picture for the object, and a message of the following type: ULONG GGFX_MSGTYPE_LINEDRAWN ULONG line_number Also refer to the example provided with DrawPictureA(). Default: NULL. GGFX_DitherMode (ULONG) - dither mode. Currently available are: DITHERMODE_NONE no dithering at all DITHERMODE_FS Floyd-Steinberg dithering DITHERMODE_RANDOM Random dithering. This mode is significantly slower than Floyd-Steinberg dithering. DITHERMODE_EDD EDD dithering. This mode is faster than Floyd-Steinberg dithering. Default: The drawhandle's dithermode. GGFX_DitherAmount (ULONG) - dither amount. Valid range: 0...255. Currently, this value is of any use only for DITHERMODE_RANDOM. Default: The drawhandle's dither amount. GGFX_AutoDither (BOOL) - automatic dither activation. temporarily overrides the drawhandle's autodither state - see ObtainDrawHandleA(). default: the drawhandle's autodither state. (v17) RESULTS bitmap - a BitMap structure ready for being blitted to the RastPort via graphics.library/BltBitMapRastPort(), or NULL if there was not enough memory available. SEE ALSO ObtainDrawHandleA(), DrawPictureA(), graphics.library/FreeBitMap(), graphics.library/BltBitMapRastPort(), CreatePictureMaskA() guigfx.library/CreatePictureMaskA guigfx.library/CreatePictureMaskA NAME CreatePictureMaskA - create a mask from a picture. (v15) CreatePictureMask - varargs stub for CreatePictureMaskA. SYNOPSIS success = CreatePictureMaskA(picture,array,bytewidth,tags) d0 a0 a1 d0 a2 BOOL CreatePictureMaskA(APTR,UBYTE *,UWORD,struct TagItem *) BOOL CreatePictureMask(APTR,UBYTE *,UWORD,tag,...,TAG_DONE) FUNCTION This function creates a single-bitplane mask from a picture's alpha-channel. This mask can be passed to e.g. graphics.library/BltMaskBitMapRastPort() for masked blitting. If the picture contains no alpha-channel, the resulting mask will be completely opaque, i.e. all bits will be set. Use GGFX_Ratio to specify a threshold. Alpha-channel values below this threshold will be rendered to a clear bit, values greater or equal to a set bit. The array argument must point to a single bitplane, with an alignment according to ((width+15)>>4)<<1. The bytewidth must be an even number. Optionally, the alpha-channel is scaled to the resulting bitplane. INPUTS picture - pointer to a picture array - pointer to a single bitplane. reserve at least (((width+15)>>4)<<1)*height bytes. bytewidth - total width of the bitplane array [bytes] tags - pointer to an array of TagItems TAGS GGFX_DestWidth (ULONG) destination width to be used in the resulting bitplane [pixels]. Default: the picture's width. GGFX_DestHeight (ULONG) destination height to be used in the resulting bitplane [rows]. Default: the picture's height. GGFX_SourceX (ULONG) left edge inside the picture where to fetch the alpha-channel from [pixels]. Default: 0. GGFX_SourceY (ULONG) top edge inside the picture where to fetch the alpha-channel from [rows]. Default: 0. GGFX_SourceWidth (ULONG) width of an area inside the picture [pixels]. Default: The picture's width. GGFX_SourceHeight (ULONG) height of an area inside the picture [rows]. Default: The picture's height. GGFX_Ratio (ULONG) - threshold. Alpha-channel values greater or equal this threshold will appear as a set bit. Default: 128 RESULTS success - boolean, FALSE if there was not enough memory for intermediate buffers SEE ALSO CreatePictureBitMapA(), graphics.library/BltMaskBitMapRastPort() guigfx.library/DeleteDirectDrawHandle guigfx.library/DeleteDirectDrawHandle NAME DeleteDirectDrawHandle - remove a direct-drawhandle. (v9) SYNOPSIS DeleteDirectDrawHandle(ddh) a0 void DeleteDirectDrawHandle(APTR) FUNCTION this function deletes a direct-drawhandle object and frees all associated memory. INPUTS ddh - a direct-drawhandle, created with CreateDirectDrawHandleA() RESULTS none SEE ALSO CreateDirectDrawHandleA() guigfx.library/DeletePenShareMap guigfx.library/DeletePenShareMap NAME DeletePenShareMap - dispose a pen-sharemap. SYNOPSIS DeletePenShareMap(psm) a0 void DeletePenShareMap(APTR) FUNCTION This function discards a pen-sharemap and frees all associated memory and colorhandles. INPUTS psm - pointer to a pen-sharemap to be deleted. SEE ALSO CreatePenShareMapA(), RemColorHandle() guigfx.library/DeletePicture guigfx.library/DeletePicture NAME DeletePicture - dispose a picture. SYNOPSIS DeletePicture(picture) a0 void DeletePicture(APTR) FUNCTION This function discards a picture and frees all associated memory. INPUTS picture - pointer to a picture to be deleted. SEE ALSO MakePictureA() guigfx.library/DirectDrawTrueColorA guigfx.library/DirectDrawTrueColorA NAME DirectDrawTrueColorA - draw truecolor data. (v9) DirectDrawTrueColor - varargs stub for DirectDrawTrueColorA. SYNOPSIS success = DirectDrawTrueColorA(directdrawhandle,array,x, y, d0 a0 a1 d0 d1 taglist) a2 BOOL DirectDrawTrueColorA(APTR,ULONG *,UWORD,UWORD, struct TagItem *) BOOL DirectDrawTrueColor(APTR,ULONG *,UWORD,UWORD,Tag,..., TAG_DONE) FUNCTION Draw an array of truecolor data of the type PIXFMT_0RGB_32 to the RastPort associated with a direct-drawhandle's parent drawhandle. This function has got very few overhead and writes (or renders) the data as straightforward as possible. INPUTS directdrawhandle - an object derived from a drawhandle via CreateDirectDrawHandleA() array - pointer to an array of data of the type PIXFMT_0RGB_32 x,y - destination coordinates inside the RastPort. taglist - pointer to an array of TagItems. TAGS GGFX_SourceWidth - total width of source array [pixels] default: sourcewidth supplied with CreateDirectDrawHandleA() RESULTS success - TRUE if the call succeeded. failures are currently very unlikely, but you should be prepared. future implementations might differ and be more likely to fail due to a lack of memory. SEE ALSO CreateDirectDrawHandleA(), DrawPictureA() guigfx.library/DoPictureMethodA guigfx.library/DoPictureMethodA NAME DoPictureMethodA - apply a method to a picture. DoPictureMethod - varargs stub for DoPictureMethodA. SYNOPSIS result = DoPictureMethodA(picture,method,arguments) a0 d0 a1 ULONG DoPictureMethodA(APTR,ULONG,ULONG *) ULONG DoPictureMethod(APTR,ULONG,argument,...) FUNCTION This function applies a method to a picture. Arguments and results depend on the specified method. INPUTS picture - pointer to a picture method - method identifier (see below) arguments - pointer to a list of arguments (see below) METHODS PICMTHD_AUTOCROP tags crop the picture at its outmost borders with differing pixels. optionally limit the search for differing pixels to an area inside the picture. TAGS GGFX_SourceX (ULONG) left edge of the area to check [pixels] Default: 0 GGFX_SourceY (ULONG) top edge of the area to check [rows] Default: 0 GGFX_SourceWidth (ULONG) width of the area to check [pixels] Default: the picture's width. GGFX_SourceHeight (ULONG) height of the area to check [rows] Default: the picture's height. RESULTS success (boolean) PICMTHD_CREATEALPHAMASK rgb, tags this method creates an alpha-channel for the given picture. The alpha-channel will be the difference for each pixel in the picture against the specified 0x00rrggbb value. Optionally, a clip area inside the source picture may be specified. TAGS GGFX_SourceX (ULONG) source left edge in the second picture [pixels]. Default: 0 GGFX_SourceY (ULONG) source top edge in the picture [rows]. Default: 0 GGFX_SourceWidth (ULONG) width of an area in the picture [pixels]. Default: the picture's width. GGFX_SourceHeight (ULONG) height of an area in the picture [rows]. Default: the picture's height. RESULTS success (boolean) NOTES this method requires conversion to PIXFMT_0RGB_32 (see annotations below) SEE ALSO PICMTHD_SETALPHA PICMTHD_CROP x, y, width, height, tags crop a picture to a rectangle defined throughout position (x|y) and dimensions (width|height) TAGS none defined RESULTS success (boolean) PICMTHD_FLIPX tags flip image (or a part of it) horizontally. TAGS GGFX_DestX (ULONG) left edge of the area to flip [pixels] Default: 0 GGFX_DestY (ULONG) top edge of the area to flip [rows] Default: 0 GGFX_DestWidth (ULONG) width of the area to be flipped [pixels] Default: the picture's width. GGFX_DestHeight (ULONG) height of the area to be flipped [rows] Default: the picture's height. RESULTS success (boolean) PICMTHD_FLIPY tags flip image (or a part of it) vertically. TAGS GGFX_DestX (ULONG) left edge of the area to flip [pixels] Default: 0 GGFX_DestY (ULONG) top edge of the area to flip [rows] Default: 0 GGFX_DestWidth (ULONG) width of the area to be flipped [pixels] Default: the picture's width. GGFX_DestHeight (ULONG) height of the area to be flipped [rows] Default: the picture's height. RESULTS success (boolean) PICMTHD_INSERT second_picture, tags insert a second picture (or a part of it) to the current picture. Clip areas may be specified both inside the current and the second picture. The processed pixels will be scaled to the specified dimensions, if necessary. TAGS GGFX_SourceX (ULONG) source left edge where to fetch the pixels from in the second picture [pixels]. Default: 0 GGFX_SourceY (ULONG) source top edge where to fetch the pixels from in the second picture [rows]. Default: 0 GGFX_SourceWidth (ULONG) width of an area in the second picture [pixels]. Default: the second picture's width. GGFX_SourceHeight (ULONG) height of an area in the second picture [rows]. Default: the second picture's height. GGFX_DestX (ULONG) destination left edge where to insert the pixels into the current picture [pixels]. Default: 0 GGFX_DestY (ULONG) destination top edge where to insert the pixels into the current picture [rows]. Default: 0 GGFX_DestWidth (ULONG) width to be inserted in the current picture. [pixels]. Default: the current picture's width. GGFX_DestHeight (ULONG) height to be inserted in the current picture. [rows]. Default: the current picture's height. RESULTS success (boolean) NOTES this method requires conversion to PIXFMT_0RGB_32 (see annotations below) PICMTHD_MAPDRAWHANDLE drawhandle, tags map a picture for optimized drawing to a drawhandle's RastPort. Drawing a picture via DrawPictureA() is much faster thereafter. TAGS none defined RESULTS success (boolean) NOTES - The internal representation of a picture may change at any time. The specified pixel format is only valid until the next call to DoPictureMethodA(). Use GetPictureAttrsA() to find out about the current format. - You risk to lose color information, i.e. when a truecolor picture has to be rendered to a 8bit RastPort, for instance. PICMTHD_MIX second_picture, tags mix a second picture to the current picture. Clip areas may be specified both inside the current and the second picture. The processed pixels will be scaled to the specified dimensions, if necessary. TAGS GGFX_Ratio (ULONG) mix ratio (0...255). Default: 128 GGFX_SourceX (ULONG) source left edge where to fetch pixels from in the second picture [pixels]. Default: 0 GGFX_SourceY (ULONG) source top edge where to fetch pixels from in the second picture [rows]. Default: 0 GGFX_SourceWidth (ULONG) width of an area in the second picture [pixels]. Default: the second picture's width. GGFX_SourceHeight (ULONG) height of an area in the second picture [rows]. Default: the second picture's height. GGFX_DestX (ULONG) destination left edge where to apply the operation to in the current picture [pixels]. Default: 0 GGFX_DestY (ULONG) destination top edge where to apply the operation to in the current picture [rows]. Default: 0 GGFX_DestWidth (ULONG) width of an area for the operation to be applied to in the current picture [pixels]. Default: the current picture's width. GGFX_DestHeight (ULONG) height of an area for the operation to be applied to in the current picture [rows]. Default: the current picture's height. RESULTS success (boolean) NOTES this method requires conversion to PIXFMT_0RGB_32 (see annotations below) SEE ALSO PICMTHD_MIXALPHA PICMTHD_MIXALPHA secondpicture, tags mix a second picture to the current picture via alpha-channel. Clip areas may be specified both inside the current and the second picture. The processed pixels will be scaled to the specified dimensions, if necessary. TAGS GGFX_SourceX (ULONG) source left edge where to fetch pixels from in the second picture [pixels]. Default: 0 GGFX_SourceY (ULONG) source top edge where to fetch pixels from in the second picture [rows]. Default: 0 GGFX_SourceWidth (ULONG) width of an area in the second picture [pixels]. Default: the second picture's width. GGFX_SourceHeight (ULONG) height of an area in the second picture [rows]. Default: the second picture's height. GGFX_DestX (ULONG) destination left edge where to apply the operation to in the current picture [pixels]. Default: 0 GGFX_DestY (ULONG) destination left edge where to apply the operation to in the current picture [rows]. Default: 0 GGFX_DestWidth (ULONG) width of an area for the operation to be applied to in the current picture [pixels]. Default: the current picture's width. GGFX_DestHeight (ULONG) height of an area for the operation to be applied to in the current picture [rows]. Default: the current picture's height. RESULTS success (boolean) NOTES this method requires conversion to PIXFMT_0RGB_32 (see annotations below) SEE ALSO PICMTHD_SETALPHA, PICMTHD_MIX PICMTHD_NEGATIVE tags invert the colors of the picture (or a part of it) TAGS GGFX_DestX (ULONG) left edge of the area to invert [pixels] Default: 0 GGFX_DestY (ULONG) top edge of the area to invert [rows] Default: 0 GGFX_DestWidth (ULONG) width of the area to invert [pixels] Default: the picture's width. GGFX_DestHeight (ULONG) height of the area to invert [rows] Default: the picture's height. RESULTS success (boolean) NOTES this method requires conversion to PIXFMT_0RGB_32 (see annotations below) PICMTHD_RENDER pixelformat, tags render a picture to a specified pixel format. Valid pixel formats are as follows: PIXFMT_CHUNKY_CLUT chunky bytes PIXFMT_0RGB_32 ULONG 0x00rrggbb truecolor data PIXFMT_RGB_24 UBYTE 0xrr,0xgg,0xbb truecolor data TAGS none defined RESULTS success (boolean) NOTES - The internal representation of a picture may change at any time. The specified pixel format is only valid until the next call to DoPictureMethodA(). Use GetPictureAttrsA() to find out about the current format. - You risk to lose color information, i.e. when a truecolor picture is rendered to PIXFMT_CHUNKY_CLUT. PICMTHD_SCALE width, height, tags scale a picture to the specified dimensions. TAGS none defined RESULTS success (boolean) NOTE This function fails if applied to a static buffer, and when the image needs to grow. In this case, specify GGFX_Independent or set a larger buffer with GGFX_BufferSize when creating the picture with MakePictureA(). PICMTHD_SET rgb, tags set a picture (or a part of it) to the specified RGB value. TAGS GGFX_DestX (ULONG) destination left edge [pixels] Default: 0 GGFX_DestY (ULONG) destination top edge [rows] Default: 0 GGFX_DestWidth (ULONG) width to be affected [pixels] Default: the picture's width. GGFX_DestHeight (ULONG) height to be affected [rows] Default: the picture's height. RESULTS success (boolean) NOTES if you apply this method to a picture of the format PIXFMT_CHUNKY_CLUT, it cannot be guaranteed that the specified RGB value is exactly hit. you can use PICMTHD_RENDER in order to convert the picture to PIXFMT_0RGB_32 before. PICMTHD_SETALPHA alpha-array, width, height, tags set an alpha-channel array for the current picture. The alpha-channel is a plain array of chunky-bytes, defining a mixing ratio for each pixel. The alpha-channel array will be scaled to fit exactly to the current picture, unless you specify other dimensions. Passing a NULL pointer for alpha-array will discard an existing alpha-channel. TAGS GGFX_DestX (ULONG) destination left edge where to insert the alpha-channel into the current picture [pixels]. Default: 0 GGFX_DestY (ULONG) destination top edge where to insert the alpha-channel into the current picture [rows]. Default: 0 GGFX_DestWidth (ULONG) width to be inserted to the current picture [pixels]. Default: the current picture's width. GGFX_DestHeight (ULONG) height to be inserted to the current picture [rows]. Default: the current picture's height. RESULTS success (boolean) NOTES this method requires conversion to PIXFMT_0RGB_32 (see annotations below) SEE ALSO PICMTHD_CREATEALPHAMASK PICMTHD_TEXTURE texturepic, coordinates, tags draw a texture to the current picture, texture-mapped via an array of coordinates. texturepic is a pointer to a picture that contains the texture, coordinates is a pointer to an array of 4 WORD pairs of x/y coordinates each. They form a trapezoid inside the current picture for the texture picture to be mapped to. border clipping is fully implemented. TAGS GGFX_SourceX (ULONG) source left edge inside the texture [pixels]. Default: 0 GGFX_SourceY (ULONG) source top edge inside the texture [rows]. Default: 0 GGFX_SourceWidth (ULONG) texture width [pixels]. Default: the texturepic's width. GGFX_SourceHeight (ULONG) texture height [rows]. Default: the texturepic's height. GGFX_DestX (ULONG) destination left edge where to apply the trapezoid to the current picture [pixels]. Default: 0 GGFX_DestY (ULONG) destination top edge where to apply the trapezoid to the current picture [rows]. Default: 0 GGFX_DestWidth (ULONG) maximum width to be inserted to the current picture [pixels]. Default: the current picture's width. GGFX_DestHeight (ULONG) maximum height to be inserted to the current picture [rows]. Default: the current picture's height. RESULTS success (boolean) NOTES this method depends on both pictures to be in the same format. DoPictureMethodA() tries to convert either of the involved pictures to the other's format. (see annotations below) SEE ALSO render.library texture-mapping documentation PICMTHD_TINTALPHA rgb, tags tint the picture with the given 0x00rrggbb. the mixing ratio is defined throughout the picture's alpha-channel. TAGS GGFX_DestX (ULONG) destination left edge where to apply the operation [pixels]. Default: 0 GGFX_DestY (ULONG) destination left edge where to apply the operation [rows]. Default: 0 GGFX_DestWidth (ULONG) width of an area for the operation to be applied to [pixels]. Default: the picture's width. GGFX_DestHeight (ULONG) height of an area for the operation to be applied to [rows]. Default: the picture's height. RESULTS success (boolean) NOTES this method requires conversion to PIXFMT_0RGB_32 (see annotations below) SEE ALSO PICMTHD_TINT, PICMTHD_MIXALPHA PICMTHD_TINT rgb, tags tint the picture with the given 0x00rrggbb value, and optionally with a specific ratio. TAGS GGFX_Ratio (ULONG) mix ratio (0...255). Default: 128 GGFX_DestX (ULONG) destination left edge where to apply the operation [pixels]. Default: 0 GGFX_DestY (ULONG) destination left edge where to apply the operation [rows]. Default: 0 GGFX_DestWidth (ULONG) width of an area for the operation to be applied to [pixels]. Default: the picture's width. GGFX_DestHeight (ULONG) height of an area for the operation to be applied to [rows]. Default: the picture's height. RESULTS success (boolean) NOTES this method requires conversion to PIXFMT_0RGB_32 (see annotations below) SEE ALSO PICMTHD_TINTALPHA, PICMTHD_MIXALPHA RESULTS result - return value (specific for the applied method) NOTES Methods that require conversion to PIXFMT_0RGB_32 will fail in a static buffer, i.e. when the picture was created with MakePictureA() in the format PIXFMT_CHUNKY_CLUT, and without a buffer overhang or GGFX_Independent. See MakePictureA() for further details. SEE ALSO MakePictureA(), ObtainDrawHandleA(), DrawPictureA() guigfx.library/DrawPictureA guigfx.library/DrawPictureA NAME DrawPictureA - draw a picture to a drawhandle. DrawPicture - varargs stub for DrawPictureA. SYNOPSIS success = DrawPictureA(drawhandle,picture,x, y, tags) d0 a0 a1 d0 d1 a2 BOOL DrawPictureA(APTR,APTR,UWORD,UWORD,struct TagItem *) BOOL DrawPicture(APTR,APTR,UWORD,UWORD,tag,...,TAG_DONE) FUNCTION This function draws a picture to the RastPort associated with a drawhandle. Optionally, the picture will be scaled to the specified dimensions. A clip area inside the picture may be specified as well. INPUTS drawhandle - pointer to a drawhandle from ObtainDrawHandleA() picture - pointer to a picture x - left edge inside the RastPort [pixels] y - top edge inside the RastPort [rows] tags - pointer to an array of TagItems TAGS GGFX_SourceX (ULONG) left edge inside the picture where to fetch the pixels from [pixels]. Default: 0. GGFX_SourceY (ULONG) top edge inside the picture where to fetch the pixels from [rows]. Default: 0. GGFX_SourceWidth (ULONG) width of an area inside the picture [pixels]. Default: The picture's width. GGFX_SourceHeight (ULONG) height of an area inside the picture [rows]. Default: The picture's height. GGFX_DestWidth (ULONG) destination width for the picture to be drawn [pixels]. Default: the picture's width. GGFX_DestHeight (ULONG) destination height for the picture to be drawn [rows]. Default: the picture's height. GGFX_CallBackHook (struct Hook *) pointer to a callback Hook structure. The associated callback function will be called from time to time while the picture is being drawn. The callback has to return TRUE for continuation or FALSE for abortion. It will be submitted a pointer to the picture for the object, and a message of the following type: ULONG GGFX_MSGTYPE_LINEDRAWN ULONG line_number Also refer to the example below. Default: NULL. GGFX_DitherMode (ULONG) - dither mode. Currently available are: DITHERMODE_NONE no dithering at all DITHERMODE_FS Floyd-Steinberg dithering DITHERMODE_RANDOM Random dithering. This mode is significantly slower than Floyd-Steinberg dithering. DITHERMODE_EDD EDD dithering. This mode is faster than Floyd-Steinberg dithering. Default: The drawhandle's dithermode. GGFX_DitherAmount (ULONG) - dither amount. Valid range: 0...255. Currently, this value is of any use only for DITHERMODE_RANDOM. Default: The drawhandle's dither amount. GGFX_AutoDither (BOOL) - automatic dither activation. temporarily overrides the drawhandle's autodither state - see ObtainDrawHandleA(). default: the drawhandle's autodither state. GGFX_RastLock (struct SignalSemaphore *) - pointer to an initialized exec.library SignalSemaphore which is used for RastPort sharing between tasks. if you want to draw to the drawhandle's RastPort while another task is rendering to this RastPort with DrawPictureA(), you must supply this argument and enclose all accesses to the RastPort with ObtainSemaphore()/ReleaseSemaphore() pairs. default: NULL (v16) RND_DestCoordinates (WORD *) - Pointer to an array of coordinates for texturemapped drawing. This array consists of 4 WORD pairs of x/y coordinates each. The array forms a trapezoid inside the destination rectangle. Any parameters are valid, since clipping is fully implemented. Texture-mapping and drawing are performed in a single pass, and there are no additional buffers allocated. Note that rotation can be easily implemented with this feature, since rotation is merely a special case of texture-mapping. See also the documentation of ObtainDrawHandleA()/GGFX_BGColor. Default - NULL. (v16) RESULTS success - TRUE if the picture could be drawn, FALSE if there was not enough memory available. Another reason for this function to fail is that the optional callback hook returned FALSE. NOTES There is almost no overhead for scaling. Scaling is extremely fast and may be considered 'gratis'. EXAMPLE The callback hook allows to interrupt DrawPictureA() at any time. A simple callback function might look like this: ULONG __saveds __asm abortdrawfunc(register __a0 struct Hook *hook) { ULONG abortsignal = 1 << *((BYTE *) (hook->h_Data)); if (SetSignal(0, 0) & abortsignal) { return FALSE; } else { return TRUE; } } In this example, an abortion signal was allocated and made available to the function via h_Data. If the signal arrives, the callback function returns FALSE to DrawPictureA(), and drawing will be interrupted. Note: Not all internal drawing-routines actually execute the hook function more than once. This mainly depends on the typical speed for a particular drawing routine or certain graphics.library or cybergraphics.library implementations. At least it is supported when scaling and rendering is involved to the drawing process. SEE ALSO ObtainDrawHandleA(), CreatePictureBitMapA() guigfx.library/GetPictureAttrsA guigfx.library/GetPictureAttrsA NAME GetPictureAttrsA - get picture attributes. GetPictureAttrs - varargs stub for GetPictureAttrsA. SYNOPSIS count = GetPictureAttrsA(picture,tags) d0 a0 a1 ULONG GetPictureAttrsA(APTR,struct TagItem *) ULONG GetPictureAttrs(APTR,tag,...,TAG_DONE) FUNCTION This function obtains a list of picture attributes. It returns the number of attributes that have been retrieved actually. INPUTS picture - pointer to a picture tags - pointer to an array of TagItems TAGS PICATTR_Width (ULONG *) The picture's width [pixels] PICATTR_Height (ULONG *) The picture's height [rows] PICATTR_PixelFormat (ULONG *) The picture's internal pixel format. Currently this can be PIXFMT_CHUNKY_CLUT, PIXFMT_0RGB_32, or PIXFMT_RGB_24. PICATTR_RawData (APTR *) Pointer to the picture's raw data. Operate on the raw pixel array only with knowledge of the actual pixel format. Warning: The internal representation of a picture may change with every call to DoPictureMethodA() or drawing functions. PICATTR_AspectX (ULONG *) Horizontal pixel aspect. PICATTR_AspectY (ULONG *) Vertical pixel aspect. PICATTR_AlphaPresent (BOOL) indicates if an alpha-channel is present. RESULTS count - the number of attributes that could be retrieved. guigfx.library/IsPictureA guigfx.library/IsPictureA NAME IsPictureA - determine whether a file is a picture or not. (v4) IsPicture - varargs stub for IsPictureA. SYNOPSIS ispicture = IsPictureA(filename,tags) d0 a0 a1 BOOL IsPictureA(char *,struct TagItem *) BOOL IsPicture(char *,tag,...,TAG_DONE) FUNCTION This function checks if the specified file could be loaded as a picture with LoadPictureA(). INPUTS filename - name of the file to be checked tags - pointer to an array of TagItems TAGS RESULTS ispicture - TRUE if the specified file is recognized as a picture that could be loaded with LoadPictureA(). SEE ALSO LoadPictureA() guigfx.library/LoadPictureA guigfx.library/LoadPictureA NAME LoadPictureA - load a picture file. LoadPicture - varargs stub for LoadPictureA. SYNOPSIS picture = LoadPictureA(filename,tags) d0 a0 a1 APTR LoadPictureA(char *,struct TagItem *) APTR LoadPicture(char *,tag,...,TAG_DONE) FUNCTION This function loads a picture. Currently, this is implemented via picture.class datatypes. INPUTS filename - name of the file to be loaded tags - pointer to an array of TagItems TAGS GGFX_ErrorCode (LONG *) Pointer to a variable that will receive a standard DOS error code. This will be NULL if loading was successful. Default: NULL GGFX_UseMask (ULONG) (v15) boolean to indicate whether a transparency color, an alpha-channel or a mask (if present) should be inserted to the picture. Note: This tag requires the picture to be converted to PIXFMT_0RGB_32. Default: FALSE GGFX_HSType (ULONG) - picture's internal histogram type, according to the histogram types defined in render/render.h. Better you never touch this tag, unless you know exactly what you are doing. Consider reading the 'memory' text file supplied with the render.library distribution. You do not need this tag under normal circumstances. Default: not defined (will be set to the pen-sharemap's histogram type, or to the default type when needed) RESULTS picture - pointer to a picture or NULL if something went wrong. The exact reason for failure can be obtained via the GGFX_ErrorCode tag. NOTES - As for current datatype implementations, alpha-channels do not seem to be supported. The datatype might translate it to a single bitplane. guigfx.library, on the other hand, does not (yet) support single-bitplane masks, so masks and transparency colors will be translated to alpha-channels. SEE ALSO DeletePicture(), IsPictureA(), MakePictureA(), ReadPictureA() guigfx.library/LockPictureA guigfx.library/LockPictureA NAME LockPictureA - lock picture attributes. (v3) LockPicture - varargs stub for LockPictureA. *** obsolete *** SYNOPSIS success = LockPictureA(picture,flags,arguments) d0 a0 d0 a1 BOOL LockPictureA(APTR,ULONG,ULONG *) BOOL LockPicture(APTR,ULONG,argument,...) FUNCTION This function locks certain picture attributes and prevents the picture from internal conversions that affect the specified flags. INPUTS picture - pointer to a picture flags - locking flags arguments - flag-specific arguments FLAGS LOCKMODE_DRAWHANDLE drawhandle lock the picture to the specified drawhandle. this leads to optimized drawing without the need to render. combine with LOCKMODE_FORCE if you want to lock the image even if color information would be lost. RESULTS success - TRUE if locking was successful, FALSE if locking is not possible, or if locking required a conversion with loss of color information. NOTES This function is currently (v4) not working, and it will always return FALSE. If you need optimized drawing, use the method PICMTHD_MAPDRAWHANDLE instead. SEE ALSO UnLockPicture(), DoPictureMethodA() guigfx.library/MakePictureA guigfx.library/MakePictureA NAME MakePictureA - make a picture from raw data or from a BitMap. MakePicture - varargs stub for MakePictureA. SYNOPSIS picture = MakePictureA(data,width,height,tags) d0 a0 d0 d1 a1 APTR MakePictureA(APTR,UWORD,UWORD,struct TagItem *) APTR MakePicture(APTR,UWORD,UWORD,tag,...,TAG_DONE) FUNCTION This function makes a picture from an array of raw data (or a part of it), or from a BitMap structure (or a part of it). Optionally, memory is allocated for a 'blank' picture. Optionally, the picture will be scaled. Raw data is not incorporated to the picture, instead it is referenced at its original location in memory, unless you specify the tag GGFX_Independent. (This does not apply to BitMap structures - pictures created from BitMaps are always independent.) If GGFX_Independent is not specified (and your picture is taken from its original location in memory), you may additionally specify a buffer 'overhang' with the tag GGFX_BufferSize. This allows internal conversions which require the image to grow at its original location in memory. You must be the owner of that memory, of course. INPUTS data - pointer to - an array of truecolor data, - an array of chunky pixels, - a BitMap structure or NULL. width - total width of the source array or BitMap [pixels] height - total height of the source array or BitMap [rows] tags - pointer to an array of TagItems TAGS GGFX_PixelFormat (ULONG) - pixel format. Currently defined are PIXFMT_CHUNKY_CLUT chunky bytes, directly acting as indices to a color-lookup-table. PIXFMT_0RGB_32 truecolor pixels (ULONG 0xaarrggbb). PIXFMT_BITMAP_CLUT a BitMap structure with normal palette lookup. You must also specify the GGFX_Palette and GGFX_NumColors tags. PIXFMT_BITMAP_HAM8 a BitMap structure with HAM8 color lookup. You must also specify the GGFX_Palette and GGFX_NumColors tags. PIXFMT_BITMAP_HAM6 a BitMap structure with HAM6 color lookup. You must also specify the GGFX_Palette and GGFX_NumColors tags. PIXFMT_BITMAP_RGB a BitMap structure which is assumed to contain truecolor data. This may apply to CyberGraphX bitmaps. Default: PIXFMT_CHUNKY_CLUT GGFX_Palette (APTR) - pointer to a color table. If this tag is not specified with PIXFMT_CHUNKY_CLUT, a default palette of 256 grey tones will be generated. Default: NULL GGFX_NumColors (ULONG) - number of colors in the color table. This tag is mandatory when GGFX_Palette is specified (see above). Default: not defined GGFX_PaletteFormat (ULONG) - format of the palette. Currently defined are: PALFMT_RGB8 ULONG 0x00rrggbb PALFMT_RGB32 ULONG red,green,blue. This is the LoadRGB32() format without trailing longword. Default: PALFMT_RGB8 GGFX_SourceX (ULONG) - left edge of an area inside the array or BitMap [pixels]. Default: 0. GGFX_SourceY (ULONG) - top edge of an area inside the array or BitMap [rows]. Default: 0. GGFX_SourceWidth (ULONG) - width of an area inside the array or BitMap [pixels]. Default: width. GGFX_SourceHeight (ULONG) - height of an area inside the array or BitMap [rows]. Default: height. GGFX_DestWidth (ULONG) - destination width of the resulting picture [pixels]. Default: GGFX_SourceWidth. GGFX_DestHeight (ULONG) - destination height for the resulting picture [rows]. Default: GGFX_SourceHeight. GGFX_BufferSize (ULONG) - total size of the specified buffer in bytes. This defines an 'oversized' buffer for the array of pixels. It informs the picture to what size it may grow for internal conversions. This tag is ignored when you supply a BitMap structure, or when GGFX_Independent is specified. Default: Required size in bytes for width * height * bytes_per_pixel. GGFX_AspectX (ULONG) - picture's horizontal aspect. Default: 1 GGFX_AspectY (ULONG) - picture's vertical aspect. Default: 1 GGFX_AlphaPresent (BOOL) - flag to indicate that the array contains alpha-channel information. This tag is only considered with PIXFMT_0RGB_32. Default: FALSE GGFX_Independent (BOOL) - If set to TRUE, the pixel array will always be copied to a seperate buffer that is maintained with the picture internally. This tag is meaningless when the input data is a BitMap structure. Default: FALSE GGFX_HSType (ULONG) - picture's internal histogram type, according to the histogram types defined in render/render.h. Better you never touch this tag, unless you know exactly what you are doing. Consider reading the 'memory' text file supplied with the render.library distribution. You do not need this tag under normal circumstances. Default: not defined (will be set to a pensharemap's histogram type, or to the default type when needed) RESULTS picture - pointer to a picture or NULL if something went wrong. SEE ALSO DeletePicture(), LoadPictureA(), ReadPictureA() guigfx.library/ObtainDrawHandleA guigfx.library/ObtainDrawHandleA NAME ObtainDrawHandleA - obtain a handle for drawing. ObtainDrawHandle - varargs stub for ObtainDrawHandleA. SYNOPSIS drawhandle = ObtainDrawHandleA(pensharemap,rastport,colormap,tags) d0 a0 a1 a2 a3 APTR ObtainDrawHandleA(APTR,struct RastPort *,struct ColorMap *, struct TagItem *) APTR ObtainDrawHandle(APTR,struct RastPort *,struct ColorMap *, tag,...,TAG_DONE) FUNCTION This function obtains a drawhandle for drawing to a RastPort. Depending on the RastPort's environment, pens may be allocated from the ColorMap. Before a pen-sharemap is passed to this function, it has to be loaded with colors via AddPictureA(), AddPaletteA(), and/or AddPixelArrayA(). Otherwise ObtainDrawHandleA() returns NULL. Optionally, you may specify NULL for the pen-sharemap argument, in which case a drawhandle for a static palette will be generated. INPUTS pensharemap - pointer to a pen-sharemap created with CreatePenShareMapA(), or NULL. rastport - pointer to a RastPort colormap - pointer to a ColorMap. Usually, this is screen->ViewPort.ColorMap of the rastport's screen. tags - pointer to an array of TagItems TAGS OBP_Precision (ULONG) - precision for pen allocations, according to the definitions in graphics/view.h. See also graphics.library/ObtainBestPenA(). Default: PRECISION_IMAGE. Note: The default precision suffices for almost every application. ObtainDrawHandleA() obtains pens in an extremely effective way. You get excellent results even with lower precisions. Commodore's idea with ObtainBestPenA() was to create a fair and effective pen-sharing mechanism, and ObtainDrawHandleA() behaves in perfect accordance to this intention. Never use insane patches for ObtainBestPenA(). GGFX_DitherMode (ULONG) - dither mode. Currently available are: DITHERMODE_NONE no dithering at all DITHERMODE_FS Floyd-Steinberg dithering DITHERMODE_RANDOM Random dithering. This mode is significantly slower than Floyd-Steinberg dithering. DITHERMODE_EDD EDD dithering. This mode is faster than Floyd-Steinberg dithering. Default: DITHERMODE_FS. GGFX_DitherAmount (ULONG) - dither amount. Valid range: 0...255. Currently this value is of any use only for DITHERMODE_RANDOM. Default: 40 GGFX_AutoDither (BOOL) - automatic dither activation. If set to TRUE, dithering is automatically activated for drawing a particular picture to a particular environment, when the loss of color information would exceed a certain threshold (see below). Default: TRUE GGFX_DitherThreshold (ULONG) - threshold for automatic dithering. The lower, the earlier automatic dithering is activated. Useful thresholds range between 10 and 10000. Refer to render.library/RGBArrayDiversityA() for further details. better you do not use this tag unless you have a good reason to. let the user customize it with the environment variable AUTODITHERTHRESHOLD. Default: 250 GGFX_MaxAllocPens (ULONG) - limit for the number of pens to be allocated from the ColorMap. Do not use this feature unless you have a good reason to. Valid range: 0...256. Default: not defined GGFX_ModeID (ULONG) - screen's modeID. Currently, this is required for guigfx.library to detect HAM modes. The full HAM color range can be achieved only with this tag specified. Default: INVALID_ID (no HAM detection takes place) GGFX_BGColor (ULONG) - RGB of an optional background color. it will be considered when a picture is being drawn with texture-mapping/rotating enabled, and there are areas inside the destination rectangle on the rastport which are not covered by the resulting picture. these areas will be rendered with this color. see also DrawPictureA()/RND_DestCoordinates for further details. default: 0xffffff (v16) RESULTS drawhandle - pointer to a handle for drawing to rastports. NULL if something went wrong. SEE ALSO ReleaseDrawHandle(), CreatePenShareMapA(), DrawPictureA(), graphics.library/ObtainBestPenA(), render.library/RGBArrayDiversityA() guigfx.library/ReadPictureA guigfx.library/ReadPictureA NAME ReadPictureA - read a picture from a RastPort. ReadPicture - varargs stub for ReadPictureA. SYNOPSIS picture = ReadPictureA(rastport,colormap,x, y, width,height,tags) d0 a0 a1 d0 d1 d2 d3 a2 APTR ReadPictureA(struct RastPort *,struct ColorMap *,UWORD,UWORD, UWORD,UWORD,struct TagItem *) APTR ReadPicture(struct RastPort *,struct ColorMap *,UWORD,UWORD, UWORD,UWORD,tag,...,TAG_DONE) FUNCTION This function reads a picture from a RastPort (or a part of it), and optionally scales it to the specified dimensions. INPUTS rastport - pointer to a RastPort where to fetch the pixels from colormap - pointer to a ColorMap where to fetch color information from. Usually this is screen->ViewPort.ColorMap of the specified RastPort's Screen. x - left edge in the RastPort [pixels] y - top edge in the RastPort [rows] width - width of the area to be read [pixels] height - height of the area to be read [rows] tags - pointer to an array of TagItems TAGS GGFX_DestWidth (ULONG) - destination width [pixels]. Default: width. GGFX_DestHeight (ULONG) - destination height [rows]. Default: height. GGFX_AspectX (ULONG) - horizontal pixel aspect for the resulting picture. Default: 1 GGFX_AspectY (ULONG) - vertical pixel aspect for the resulting picture. Default: 1 GGFX_ModeID (ULONG) - screen's mode ID. currently required for determining HAM rastports. Default: none GGFX_HSType (ULONG) - picture's internal histogram type, according to the histogram types defined in render/render.h. Better you never touch this tag, unless you know exactly what you are doing. Consider reading the 'memory' text file supplied with the render.library documentation. RESULTS picture - pointer to a picture or NULL if not enough memory. SEE ALSO LoadPictureA(), MakePictureA() guigfx.library/ReleaseDrawHandle guigfx.library/ReleaseDrawHandle NAME ReleaseDrawHandle - free a drawhandle. SYNOPSIS ReleaseDrawHandle(drawhandle) a0 void ReleaseDrawHandle(APTR) FUNCTION This function discards a drawhandle, frees associated memory, and returns allocated pens (if any) to the related ColorMap. INPUTS drawhandle - drawhandle obtained via ObtainDrawHandleA() SEE ALSO ObtainDrawHandleA() guigfx.library/RemColorHandle guigfx.library/RemColorHandle NAME RemColorHandle - manually remove a colorhandle. SYNOPSIS RemColorHandle(colorhandle) a0 void RemColorHandle(APTR) FUNCTION This function removes particular color information from a pen-sharemap. Further calls to ObtainDrawHandleA() may lead to different pen allocations then. INPUTS colorhandle - pointer to a colorhandle from AddPictureA(), AddPaletteA(), or AddPixelArrayA() NOTE DeletePenShareMap() arbitrarily frees all its colorhandles. There is no need to manually remove them. This function is only required if you wish to modify a pen-sharemap and then call ObtainDrawHandleA() again. Calling RemColorHandle() for colorhandles that have been removed with DeletePenShareMap() will be fatal. SEE ALSO AddPictureA(), AddPaletteA(), AddPixelArrayA(), DeletePenShareMap(), ObtainDrawHandleA() guigfx.library/UnLockPicture guigfx.library/UnLockPicture NAME UnLockPicture - unlock picture attributes (v3) *** obsolete *** SYNOPSIS UnLockPicture(picture,flags) a0 d0 UnLockPicture(APTR,ULONG) FUNCTION This function frees picture attributes that have been locked with LockPictureA(). INPUTS picture - pointer to a picture flags - flags to unlock RESULTS none SEE ALSO LockPictureA() NOTES This function will currently (v4) do nothing. Read the annotations in LockPictureA().