Support Arduino debug output

• Add: InitDebug() to support redirection of debug output to Serial / stderr
• Change: debug_print() renamed to GSLC_DEBUG_PRINT()
• Change: Improved RAM consumption on Arduino
• Change: Example code enables debug output, cleaned up error handling
• Change: Enable debugging output by default in Config (DEBUG_ERR 1), set to 0 to reduce memory
• Migration Notes (from 0.8.2):
  • To enable debug output:
    • Add user DebugOut() function
    • Call gslc_InitDebug() at start of code
    • Please refer to example code for details

Support elements in Flash memory

• Add: Significant RAM savings with Flash-based elements, making it possible to use smaller Arduino CPUs.
  • Add: Element collections support read-only elements stored in Flash memory (PROGMEM).
  • Add: Element Reference type defines where the elements are located (eg. tsPage's internal element array in RAM or external Flash memory).
  • Add: ElemCreate*_P() macros to build read-only elements in Flash
  • Change: Some Arduino sketches use ElemCreate*_P() macros to select Flash memory for elements, reducing RAM consumption considerably.
• Change: Arduino sketches moved main loop code into loop()
• Fix: Clipping of points fixed: ClipPt()
• Change: Element drawing reduce flicker in frame: ElemDrawByRef()
• Migration Notes (from 0.8.1):
  • Add an element reference array static/global (array of gslc_tsElemRef).
    • Previously, a static/global element array would have been allocated as follows:
      
      gslc_tsElem m_asPageElem[MAX_ELEM];
    • With this version, an element reference array must also be allocated. If Flash memory is not being used for elements, the array bounds can be the same as the element array. For example:
      
      gslc_tsElemRef m_asPageElemRef[MAX_ELEM];
    • See example code for details
  • PageAdd() adds two parameters (element reference array and total element count).
  • To take advantage of Flash-based elements, see example /arduino/gslc_ex07_ard/

UPDATE: As of commit 67f3a93 (2017/01/08), all CPUs (eg. Feather M0) can use ElemCreate*_P() macros (even if PROGMEM is not supported).

Enhancements for Arduino

• Add support for element text strings in Flash (PROGMEM)
  • Add ElemSetTxtMem()
  • Add tsElem.eTxtFlags
• GUIslice tested with:
  • Raspberry Pi: PiTFT 2.8" Capacitive (SDL1.2)
  • Raspberry Pi: PiTFT 2.8" Capacitive (SDL2.0)
  • Adafruit Feather M0 (Cortex M0): Adafruit 2.2" TFT breakout
  • Arduino (Pro Mini ATmega328P): Adafruit 2.2" TFT breakout
  • Arduino (ATmega2560): Adafruit 2.2" TFT breakout
  • Arduino (ATmega2560): Adafruit 2.8" TFT resistive touch shield
• Many enhancements for Arduino support
  • Add support for image backgrounds
  • Add support for STMPE610 touch driver
  • Port all examples to Arduino
• Other enhancements
  • Add ElemGetRedraw()
  • Add CollectGetRedraw()
  • Prevent unnecessary redraw in some functions
  • Fixed range checking of maximum elements
• Migration Notes (from v0.8)
  • No changes to public APIs
  • Changes to developer APIs:
    • Change param to include eTxtFlags: DrvDrawTxt(), DrvGetTxtSize()

Add support for Arduino!

• Added support for Arduino via Adafruit-GFX library
  • Created /arduino directory, including a few example sketches
  • Initial display driver support: ILI9341
  • Display and touch driver selection is done in GUIslice_config.h. Config also needs to be modified to match board/shield pinout.
  • This is an early release for Arduino -- more functionality, drivers, documentation and examples to come
  • Note that standard Arduino processors have limited RAM (<2KB). Therefore, if a large number of elements are required, it is recommended to select larger options such as an ATmega2560.
• Added Image References (tsImgRef).
  • Image References contain information associated with an image to be rendered (source, file format, etc.) and support delayed loading.
  • Add: Support for loading images from SD card via SPI interface
  • Add: ResetImage(), GetImageFromFile(), GetImageFromSD(), GetImageFromRam(), GetImageFromProg().
• Touch handling partitioned into support via display driver and support via external touch driver
  • InitTs() removed (Init() automatically calls InitTouch())
  • Add: InitTouch(), GetTouch()
• Optimized memory consumption
  • Note that Element IDs are now int16_t
• Text strings add support for external buffers
  • Text strings now support two modes of operation: internal/local fixed-length buffers (same as prior releases) or external variable-length buffers
  • This change enables fine-grained control over memory consumption associated with textual elements. The new mode is selected via GSLC_LOCAL_STR=0. RPI/LINUX users will likely want to continue with the internal buffer mode.
• Misc fixes
  • FontAdd() range checking
  • ElemSetTxtStr() only redraws if changed
  • ElemXGaugeDraw() eliminates redraw flicker
• Config changes
  • Add: GSLC_LOCAL_STR
  • Add: DRV_DISP_ADAGFX, ADAGFX_*
  • Add: DRV_TOUCH_*
  • Rename: GSLC_ELEM_STRLEN_MAX to GSLC_LOCAL_STR_LEN
• Migration Notes (Public APIs)
  • ElemCreateBtnImg(), ElemCreateImg(), ElemSetImage(), SetBkgndImage() now use tsImgRef instead of image filename. Create an image reference with GetImageFrom*()
  • ElemCreateTxt(), ElemCreateBtnTxt(), ElemCreate() add buffer length parameter. If using legacy internal mode (GSLC_LOCAL_STR=1) then simply pass a value of 0 as it will be ignored. If using external storage (GSLC_LOCAL_STR=0) then character buffer should be a static or global variable.
• Migration Notes (Developer APIs)
  • DrvLoadBmp() replaced by DrvLoadImage()
  • DrvLoadImage(), DrvSetBkgndImage(), DrvSetElemImageNorm(), DrvSetElemImageGlow(), DrvDrawImage() now use tsImgRef
    Compound element structs (eg. XSelNum) need to include text string storage to support GSLC_LOCAL_STR=0

Centralized Configuration

• Exciting news: GUIslice will add support for Arduino very soon!
• Centralized configuration into GUIslice_config.h
  • Removed InitEnv() and DrvInitEnv()
  • Environment setup migrated to user code (see UserInitEnv() in examples)
• Font routines use tsFont* instead of void*
  • Added DrvGetTxtSize()
• Reduced maximum ID range to 16-bit; user range now 0..16383
• Text justification code migrated to core DrawElemByRef() instead of driver
• Migration Notes (from v0.7.2 #578c460)
  • Replace call to InitEnv() with user init (see UserInitEnv() in examples)
  • Add GUIslice_config.h, modify as needed for environment / display
  • Rename gslc_Color to gslc_tsColor, gslc_Pt to gslc_tsPt and gslc_Rect to gslc_tsRect
  • Remove viewport functions and viewport params in Init() call (see #c8c41a8 notes)

Added driver support for SDL2.0!

• GUIslice with SDL2 can leverage hardware rendering (via OpenGL).
  • "src/GUIslice_drv_sdl.*" supports both SDL1.2 and SDL2 via compiler flag ("DRV_TYPE_SDL1" or "DRV_TYPE_SDL2").
  • Code for SDL1.2 typically stores SDL_Surface while code for SDL2.0 typically stores SDL_Texture.
• Driver-specific members moved into gslc_tsDriver struct (tsGui.pvDriver)
• tslib interaction (eg. GetTsTouch) moved to "src/GUIslice_drv_sdl.*"
• Migration Notes (from 0.7.1):
  • Renamed "src/GUIslice_drv_sdl1.*" to "src/GUIslice_drv_sdl.*"
  • Renamed compile flag VT_WRK_EN to DRV_SDL_FIX_START
  • User code instantiates gslc_tsDriver and passes into new param of Init()
  • User code add #include "GUIslice_drv.h"
  • Makefile requires selecting appropriate driver (either uncomment in file or pass via command-line)
• Other details
  • DrvDraw() routines return bool instead of void
  • Add partial redraw flag (bRedrawPartialEn)
  • Add diagnostic frame rate reporting
  • Renamed private surface members (eg. pvSurfBkgnd to pvImgBknd) and related functions (eg. DrvSurfaceDestruct to DrvImageDestruct).
  • DrvLoadBmp() returns void* instead of SDL_Surface*
  • Renamed "tests/test-sdl.*" to "tests/test-sdl1.*" and added "tests/test-sdl2.*"
  • Enhanced drawing emulation routines
  • Add type gslc_Pt

Using SDL2.0 on Raspberry Pi

• GUIslice has been tested on a Raspberry Pi 3 with both SDL1.2 and SDL2.0 without Xwindows
• SDL2.0 with OpenGL can take advantage of video hardware acceleration
• Displays such as PiTFT work from fb1. SDL2.0 using OpenGL will write to fb0. An extra step needs to be taken to allow the hardware accelerated output on fb0 to be seen by fb1.
  • NOTE: More details will follow on the ImpulseAdventure website
  • Compile SDL2.0 from sources
  • Enable rpi-fbcp to mirror /dev/fb0 to /dev/fb1

Minor cleanup

• Migration Notes (from v0.7)
  • No changes to public APIs
• Internal Changes
  • Change: tsElem.nType uses int instead of teElemType. teElemType
    enum split between core and extended file so that new types
    can be defined in GUIslice_ex.h and not require changes to
    GUIslice.h header.
  • Change: teTouch enumeration separates state and position

Common Event Handler framework

• Now events (draw, tick, touch) are propagated down from GUI
  through pages and element collections to individual element
  callback functions.
• Migration Notes (from v0.6.x):
  • No changes to public API
• Internal changes:
  • Add: common event callback function (pfuncXEvent) to GUI,
    Page, Collect, Elem
  • Add: event handlers: PageEvent(), CollectEvent(), ElemEvent()
  • Add: *SetEventFunc() for Page, Collect, Elem
  • Add: structures for tsEvent, tsEventTouch, teEventType,
    teEventSubType
  • Add: ElemOwnsCoord()
  • Remove: tsCollect.pElemParent
  • Change: Renamed NotifyElemTouch() to ElemSendEventTouch()
  • Change: teTouch enumeration

Enhancements

Enhancements

• Add: Configurability in InitEnv() call to specify frame
  buffer and touch device. This facilitates support for
  other display hardware.
• Add: ElemSetTxtMargin() to define text margin
• Add: GetVer() to return current library version
• Migration Notes (from 0.6.1):
  • InitEnv(): changed parameters to support configuration of
    device paths from user code. tsGui* parameter is replaced by
    framebuffer and touchscreen device path strings. Pass NULL if
    not used (eg. no touch support).

Add more styling controls

• Add: MIT License
• Add: Method to copy element styling between elements (ElemSetStyleFrom)
• Add: Config to enable frame (ElemSetFrameEn)
• Add: Config for Frame and Text glow color (ElemSetGlowCol)
• Fix: Fixed occasional button that retained glow status
• Modify: Revised color definitions (GSLC_COL_*) to offer more
  shades and consistency
• Migration Notes (from 0.6):
  • ElemSetCol(): 4th parameter was occasionally used to define FrameGlow
    for certain controls (such as XSlider), but not it is only used for
    FillGlow
  • Color definitions (GSLC_COL_*_LT and GSLC_COL_*_DK) are replaced
    by a GSLC_COL_*_LT# or _DK# where # represents the level of shade