README ^^^^^^ This directory contains tiny graphics support for NuttX. The contents of this directory are only build if CONFIG_NX is defined in the NuttX configuration file. Contents ^^^^^^^^ Roadmap Related Header Files Directories Installing New Fonts Configuration Settings Roadmap ^^^^^^^ This directory holds NuttX graphic packages. Not all of these packages are implemented at the present, but here is the longer term roadmap: NxWidgets - NxWidgets is a higher level, C++, object-oriented library for object- oriented access to graphics "widgets." NxWidgets is provided as a separate package. NxWidgets is built on top of the core NuttX graphics subsystem, but is not a part of the core graphics subystems. NXTOOLKIT - A set of C graphics tools that provide higher-level window drawing operations. The toolkit can be used for window-oriented graphics without NxWidgets and is built on top of NX. NXFONTS - A set of C graphics tools for present (bitmap) font images. NX - The tiny NuttX windowing system. This includes both a small-footprint, single user implementaton (NXSU as described below) and a somewhat larger multi-user implentation (NXMU as described below). Both conform to the same APIs as defined in include/nuttx/nx/nx.h and, hence, are more-or-less interchangable. NX can be used without NxWidgets and without NXTOOLKIT for raw access to window memory. NXGLIB - Low level graphics utilities and direct framebuffer rendering logic. NX is built on top of NXGLIB. NxConsole - NxConsole is a write-only character device that is built on top of an NX window. This character device can be used to provide stdout and stderr and, hence, can provide the output side of NuttX console. NxConsole is only available when the multi-user NX implementation is selected (CONFIG_NX_MULTIUSERs). Related Header Files ^^^^^^^^^^^^^^^^^^^^ include/nuttx/nx/nxglib.h -- Describes the NXGLIB C interfaces include/nuttx/nx/nx.h -- Describes the NX C interfaces include/nuttx/nx/nxtk.h -- Describe the NXTOOLKIT C interfaces include/nuttx/nx/nxfont.h -- Describe sthe NXFONT C interfaces Directories ^^^^^^^^^^^ graphics/nxglib The NuttX tiny graphics library. The directory contains generic utilities support operations on primitive graphics objects and logic to rasterize directly into a framebuffer. It has no concept of windows (other than the one, framebuffer window). graphics/nxbe This is the "back-end" of a tiny windowing system. It can be used with either of two front-ends to complete a windowing system (see nxmu and nxsu below). It contains most of the important window management logic: clipping, window controls, window drawing, etc. graphics/nxsu This is the NX single user "front end". When combined with the generic "back-end" (nxbe), it implements a single thread, single user windowing system. The files in this directory present the window APIs described in include/nuttx/nx/nx.h. The single user front-end is selected when CONFIG_NX_MULTIUSER is not defined in the NuttX configuration file. graphics/nxmu This is the NX multi user "front end". When combined with the generic "back-end" (nxbe), it implements a multi-threaded, multi-user windowing system. The files in this directory present the window APIs described in include/nuttx/nx/nx.h. The multi-user front end includes a graphics server that executes on its own thread; multiple graphics clients then communicate with the server via a POSIX message queue to serialize window operations from many threads. The multi-user front-end is selected when CONFIG_NX_MULTIUSER is defined in the NuttX configuration file. graphics/nxfonts This is where the NXFONTS implementation resides. This is a relatively low- level set of charset set/glyph management APIs. See include/nuttx/nx/nxfonts.h graphics/nxtk This is where the NXTOOLKIT implementation resides. This toolkit is built on top of NX and works with either the single-user or multi-user NX version. See include/nuttx/nx/nxtk.h nuttx/../NxWidgets The NxWidgets code is provided as a separate package located outside of the NuttX source tree (probably at this location). Installing New Fonts ^^^^^^^^^^^^^^^^^^^^ There is a tool called bdf-converter in the directory tools/. The bdf-converter program be used to convert fonts in Bitmap Distribution Format (BDF) into fonts that can be used in the NX graphics system. Below are general instructions for creating and installing a new font in the NX graphic system: 1. Locate a font in BDF format, 2. Use the bdf-converter program to convert the BDF font to the NuttX font format. This will result in a C header file containing defintions. That header file should be installed at, for example, graphics/nxfonts/nxfonts_myfont.h. Create a new NuttX configuration variable. For example, suppose you define the following variable: CONFIG_NXFONT_MYFONT. Then you would need to: 3. Define CONFIG_NXFONT_MYFONT=y in your NuttX configuration file. A font ID number has to be assigned for each new font. The font ID is defined in the file include/nuttx/nx/nxfonts.h. Those definitions have to be extended to support your new font. Look at how the font ID enabled by CONFIG_NXFONT_SANS23X27 is defined and add an ID for your new font in a similar fashion: 4. include/nuttx/nx/nxfonts.h. Add you new font as a possible system default font: #if defined(CONFIG_NXFONT_SANS23X27) # define NXFONT_DEFAULT FONTID_SANS23X27 #elif defined(CONFIG_NXFONT_MYFONT) # define NXFONT_DEFAULT FONTID_MYFONT #endif Then define the actual font ID. Make sure that the font ID value is unique: enum nx_fontid_e { FONTID_DEFAULT = 0 /* The default font */ #ifdef CONFIG_NXFONT_SANS23X27 , FONTID_SANS23X27 = 1 /* The 23x27 sans serif font */ #endif #ifdef CONFIG_NXFONT_MYFONT , FONTID_MYFONT = 2 /* My shiny, new font */ #endif ... New Add the font to the NX build system. There are several files that you have to modify to to this. Look how the build system uses the font CONFIG_NXFONT_SANS23X27 for examaples: 5. nuttx/graphics/Makefile. This file needs logic to auto-generate a C source file from the header file that you generated with the the bdf-converter program. Notice NXFONTS_FONTID=2; this must be set to the same font ID value that you defined in the include/nuttx/nx/nxfonts.h file. genfontsources: ifeq ($(CONFIG_NXFONT_SANS23X27),y) @$(MAKE) -C nxfonts -f Makefile.sources TOPDIR=$(TOPDIR) NXFONTS_FONTID=1 EXTRADEFINES=$(EXTRADEFINES) endif ifeq ($(CONFIG_NXFONT_MYFONT),y) @$(MAKE) -C nxfonts -f Makefile.sources TOPDIR=$(TOPDIR) NXFONTS_FONTID=2 EXTRADEFINES=$(EXTRADEFINES) endif 6. nuttx/graphics/nxfonts/Make.defs. Set the make variable NXFSET_CSRCS. NXFSET_CSRCS determines the name of the font C file to build when NXFONTS_FONTID=2: ifeq ($(CONFIG_NXFONT_SANS23X27),y) NXFSET_CSRCS += nxfonts_bitmaps_sans23x27.c endif ifeq ($(CONFIG_NXFONT_MYFONT),y) NXFSET_CSRCS += nxfonts_bitmaps_myfont.c endif 7. nuttx/graphics/nxfonts/Makefile.sources. This is the Makefile used in step 5 that will actually generate the font C file. So, given your NXFONTS_FONTID=2, it needs to determine a prefix to use for auto-generated variable and function names and (again) the name of the autogenerated file to create (this must be the same name that was used in nuttx/graphics/nxfonts/Make.defs): ifeq ($(NXFONTS_FONTID),1) NXFONTS_PREFIX := g_sans23x27_ GEN_CSRC = nxfonts_bitmaps_sans23x27.c endif ifeq ($(NXFONTS_FONTID),2) NXFONTS_PREFIX := g_myfont_ GEN_CSRC = nxfonts_bitmaps_myfont.c endif 8. graphics/nxfonts/nxfonts_bitmaps.c. This is the file that contains the generic font structures. It is used as a "template" file by nuttx/graphics/nxfonts/Makefile.sources to create your customized font data set. #if NXFONTS_FONTID == 1 # include "nxfonts_sans23x27.h" #elif NXFONTS_FONTID == 2 # include "nxfonts_myfont.h" #else # error "No font ID specified" #endif Where nxfonts_myfont.h is the NuttX font file that we generated in step 2 using the bdf-converter tool. 9. graphics/nxfonts/nxfonts_getfont.c. Finally, we need to extend the logic that does the run-time font lookups so that can find our new font. The lookup function is NXHANDLE nxf_getfonthandle(enum nx_fontid_e fontid). The new font information needs to be added to data structures used by that function: #ifdef CONFIG_NXFONT_SANS23X27 extern const struct nx_fontpackage_s g_sans23x27_package; #endif #ifdef CONFIG_NXFONT_MYFONT extern const struct nx_fontpackage_s g_myfont_package; #endif static FAR const struct nx_fontpackage_s *g_fontpackages[] = { #ifdef CONFIG_NXFONT_SANS23X27 &g_sans23x27_package, #endif #ifdef CONFIG_NXFONT_MYFONT &g_myfont_package, #endif NULL }; Configuration Settings ^^^^^^^^^^^^^^^^^^^^^^ General NX Settings ------------------- CONFIG_NX Enables overall support for graphics library and NX CONFIG_NX_MULTIUSER Configures NX in multi-user mode CONFIG_NX_NPLANES Some YUV color formats requires support for multiple planes, one for each color component. Unless you have such special hardware, this value should be undefined or set to 1. CONFIG_NX_WRITEONLY Define if the underlying graphics device does not support read operations. Automatically defined if CONFIG_NX_LCDDRIVER and CONFIG_LCD_NOGETRUN are defined. CONFIG_NX_DISABLE_1BPP, CONFIG_NX_DISABLE_2BPP, CONFIG_NX_DISABLE_4BPP, CONFIG_NX_DISABLE_8BPP, CONFIG_NX_DISABLE_16BPP, CONFIG_NX_DISABLE_24BPP, and CONFIG_NX_DISABLE_32BPP NX supports a variety of pixel depths. You can save some memory by disabling support for unused color depths. CONFIG_NX_PACKEDMSFIRST If a pixel depth of less than 8-bits is used, then NX needs to know if the pixels pack from the MS to LS or from LS to MS CONFIG_NX_MOUSE Build in support for mouse input. CONFIG_NX_KBD Build in support of keypad/keyboard input. CONFIG_NXTK_BORDERWIDTH Specifies with with of the border (in pixels) used with framed windows. The default is 4. CONFIG_NXTK_BORDERCOLOR1, CONFIG_NXTK_BORDERCOLOR2, CONFIG_NXTK_BORDERCOLOR3 Specify the colors of the border used with framed windows. CONFIG_NXTK_BORDERCOLOR2 is the shadow side color and so is normally darker. CONFIG_NXTK_BORDERCOLOR3 is the shiny side color and so is normally brighter. The default is mediumdark grey, and light grey, respectively CONFIG_NXTK_AUTORAISE If set, a window will be raised to the top if the mouse position is over a visible portion of the window. Default: A mouse button must be clicked over a visible portion of the window. CONFIG_NXFONTS_CHARBITS The number of bits in the character set. Current options are only 7 and 8. The default is 7. Font Selections --------------- CONFIG_NXFONT_SANS17X22 This option enables support for a tiny, 17x22 san serif font (font ID FONTID_SANS17X22 == 14). CONFIG_NXFONT_SANS20X26 This option enables support for a tiny, 20x26 san serif font (font ID FONTID_SANS20X26 == 15). CONFIG_NXFONT_SANS23X27 This option enables support for a tiny, 23x27 san serif font (font ID FONTID_SANS23X27 == 1). CONFIG_NXFONT_SANS22X29 This option enables support for a small, 22x29 san serif font (font ID FONTID_SANS22X29 == 2). CONFIG_NXFONT_SANS28X37 This option enables support for a medium, 28x37 san serif font (font ID FONTID_SANS28X37 == 3). CONFIG_NXFONT_SANS39X48 This option enables support for a large, 39x48 san serif font (font ID FONTID_SANS39X48 == 4). CONFIG_NXFONT_SANS17X23B This option enables support for a tiny, 17x23 san serif bold font (font ID FONTID_SANS17X23B == 16). CONFIG_NXFONT_SANS20X27B This option enables support for a tiny, 20x27 san serif bold font (font ID FONTID_SANS20X27B == 17). CONFIG_NXFONT_SANS22X29B This option enables support for a small, 22x29 san serif bold font (font ID FONTID_SANS22X29B == 5). CONFIG_NXFONT_SANS28X37B This option enables support for a medium, 28x37 san serif bold font (font ID FONTID_SANS28X37B == 6). CONFIG_NXFONT_SANS40X49B This option enables support for a large, 40x49 san serif bold font (font ID FONTID_SANS40X49B == 7). CONFIG_NXFONT_SERIF22X29 This option enables support for a small, 22x29 font (with serifs) (font ID FONTID_SERIF22X29 == 8). CONFIG_NXFONT_SERIF29X37 This option enables support for a medium, 29x37 font (with serifs) (font ID FONTID_SERIF29X37 == 9). CONFIG_NXFONT_SERIF38X48 This option enables support for a large, 38x48 font (with serifs) (font ID FONTID_SERIF38X48 == 10). CONFIG_NXFONT_SERIF22X28B This option enables support for a small, 27x38 bold font (with serifs) (font ID FONTID_SERIF22X28B == 11). CONFIG_NXFONT_SERIF27X38B This option enables support for a medium, 27x38 bold font (with serifs) (font ID FONTID_SERIF27X38B == 12). CONFIG_NXFONT_SERIF38X49B This option enables support for a large, 38x49 bold font (with serifs) (font ID FONTID_SERIF38X49B == 13). NxConsole Configuration Settings -------------------------------- CONFIG_NXCONSOLE Enables building of the NxConsole driver. NxConsole output text/graphics options: CONFIG_NXCONSOLE_BPP Currently, NxConsole supports only a single pixel depth. This configuration setting must be provided to support that single pixel depth. Default: The smallest enabled pixel depth. (see CONFIG_NX_DISABLE_*BPP) CONFIG_NXCONSOLE_CURSORCHAR The bitmap code to use as the cursor. Default '_' CONFIG_NXCONSOLE_MXCHARS NxConsole needs to remember every character written to the console so that it can redraw the window. This setting determines the size of some internal memory allocations used to hold the character data. Default: 128. CONFIG_NXCONSOLE_CACHESIZE NxConsole supports caching of rendered fonts. This font caching is required for two reasons: (1) First, it improves text performance, but more importantly (2) it preserves the font memory. Since the NX server runs on a separate server thread, it requires that the rendered font memory persist until the server has a chance to render the font. Unfortunately, the font cache would be quite large if all fonts were saved. The CONFIG_NXCONSOLE_CACHESIZE setting will control the size of the font cache (in number of glyphs). Only that number of the most recently used glyphs will be retained. Default: 16. NOTE: There can still be a race condition between the NxConsole driver and the NX task. If you every see character corruption (especially when printing a lot of data or scrolling), then increasing the value of CONFIG_NXCONSOLE_CACHESIZE is something that you should try. Alternatively, you can reduce the size of CONFIG_MQ_MAXMSGSIZE which will force NxConsole task to pace the server task. CONFIG_NXCONSOLE_CACHESIZE should be larger than ONFIG_MQ_MAXMSGSIZE in any event. CONFIG_NXCONSOLE_LINESEPARATION This the space (in rows) between each row of test. Default: 0 CONFIG_NXCONSOLE_NOWRAP By default, lines will wrap when the test reaches the right hand side of the window. This setting can be defining to change this behavior so that the text is simply truncated until a new line is encountered. NxConsole Input options CONFIG_NXCONSOLE_NXKBDIN Take input from the NX keyboard input callback. By default, keyboard input is taken from stdin (/dev/console). If this option is set, then the interface nxcon_kdbin() is enabled. That interface may be driven by window callback functions so that keyboard input *only* goes to the top window. CONFIG__NXCONSOLE_KBDBUFSIZE If CONFIG_NXCONSOLE_NXKBDIN is enabled, then this value may be used to define the size of the per-window keyboard input buffer. Default: 16 CONFIG_NXCONSOLE_NPOLLWAITERS The number of threads that can be waiting for read data available. Default: 4 NX Multi-user only options -------------------------- CONFIG_NX_BLOCKING Open the client message queues in blocking mode. In this case, nx_eventhandler() will not return until a message is received and processed. CONFIG_NX_MXSERVERMSGS and CONFIG_NX_MXCLIENTMSGS Specifies the maximum number of messages that can fit in the message queues. No additional resources are allocated, but this can be set to prevent flooding of the client or server with too many messages (CONFIG_PREALLOC_MQ_MSGS controls how many messages are pre-allocated).