/**
  ******************************************************************************
  * @file    stm32f769i_discovery_lcd.c
  * @author  MCD Application Team
  * @version V1.0.0
  * @date    22-April-2016
  * @brief   This file includes the driver for Liquid Crystal Display (LCD) module
  *          mounted on STM32F769I-DISCOVERY board.
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT(c) 2016 STMicroelectronics</center></h2>
  *
  * Redistribution and use in source and binary forms, with or without modification,
  * are permitted provided that the following conditions are met:
  *   1. Redistributions of source code must retain the above copyright notice,
  *      this list of conditions and the following disclaimer.
  *   2. Redistributions in binary form must reproduce the above copyright notice,
  *      this list of conditions and the following disclaimer in the documentation
  *      and/or other materials provided with the distribution.
  *   3. Neither the name of STMicroelectronics nor the names of its contributors
  *      may be used to endorse or promote products derived from this software
  *      without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  ******************************************************************************
  */

/* File Info: ------------------------------------------------------------------
                                   User NOTES
1. How To use this driver:
--------------------------
   - This driver is used to drive directly in video mode a LCD TFT using the DSI interface.
     The following IPs are implied : DSI Host IP block working
     in conjunction to the LTDC controller.
   - This driver is linked by construction to LCD KoD mounted on board MB1166.

2. Driver description:
---------------------
  + Initialization steps:
     o Initialize the LCD using the BSP_LCD_Init() function.
     o Select the LCD layer to be used using the BSP_LCD_SelectLayer() function.
     o Enable the LCD display using the BSP_LCD_DisplayOn() function.

  + Options
     o Configure and enable the color keying functionality using the
       BSP_LCD_SetColorKeying() function.
     o Modify in the fly the transparency and/or the frame buffer address
       using the following functions:
       - BSP_LCD_SetTransparency()
       - BSP_LCD_SetLayerAddress()

  + Display on LCD
     o Clear the whole LCD using BSP_LCD_Clear() function or only one specified string
       line using the BSP_LCD_ClearStringLine() function.
     o Display a character on the specified line and column using the BSP_LCD_DisplayChar()
       function or a complete string line using the BSP_LCD_DisplayStringAtLine() function.
     o Display a string line on the specified position (x,y in pixel) and align mode
       using the BSP_LCD_DisplayStringAtLine() function.
     o Draw and fill a basic shapes (dot, line, rectangle, circle, ellipse, .. bitmap)
       on LCD using the available set of functions.

------------------------------------------------------------------------------*/

/* Includes ------------------------------------------------------------------*/
#include "stm32f769i_discovery_lcd.h"
#include "../../../Utilities/Fonts/fonts.h"
#include "../../../Utilities/Fonts/font24.c"
#include "../../../Utilities/Fonts/font20.c"
#include "../../../Utilities/Fonts/font16.c"
#include "../../../Utilities/Fonts/font12.c"
#include "../../../Utilities/Fonts/font8.c"

/** @addtogroup BSP
  * @{
  */

/** @addtogroup STM32F769I-DISCOVERY
  * @{
  */

/** @addtogroup STM32F769I-DISCOVERY_LCD
  * @{
  */

/** @defgroup STM32F769I-DISCOVERY_LCD_Private_TypesDefinitions LCD Private TypesDefinitions
  * @{
  */
/**
  * @}
  */

/** @defgroup STM32F769I-DISCOVERY_LCD_Private_Defines LCD Private Defines
  * @{
  */
static DSI_VidCfgTypeDef hdsivideo_handle;
/**
  * @}
  */

/** @defgroup STM32F769I-DISCOVERY_LCD_Private_Macros LCD Private Macros
  * @{
  */
#define ABS(X)                 ((X) > 0 ? (X) : -(X))

#define POLY_X(Z)              ((int32_t)((Points + (Z))->X))
#define POLY_Y(Z)              ((int32_t)((Points + (Z))->Y))
/**
  * @}
  */

/** @defgroup STM32F769I-DISCOVERY_LCD_Exported_Variables STM32F769I DISCOVERY LCD Exported Variables
  * @{
  */
DMA2D_HandleTypeDef hdma2d_discovery;
LTDC_HandleTypeDef  hltdc_discovery;
DSI_HandleTypeDef hdsi_discovery;
uint32_t lcd_x_size = OTM8009A_800X480_WIDTH;
uint32_t lcd_y_size = OTM8009A_800X480_HEIGHT;
/**
  * @}
  */


/** @defgroup STM32F769I-DISCOVERY_LCD_Private_Variables LCD Private Variables
  * @{
  */

/**
  * @brief  Default Active LTDC Layer in which drawing is made is LTDC Layer Background
  */
static uint32_t  ActiveLayer = LTDC_ACTIVE_LAYER_BACKGROUND;

/**
  * @brief  Current Drawing Layer properties variable
  */
static LCD_DrawPropTypeDef DrawProp[LTDC_MAX_LAYER_NUMBER];
/**
  * @}
  */

/** @defgroup STM32F769I-DISCOVERY_LCD_Private_FunctionPrototypes LCD Private FunctionPrototypes
  * @{
  */
static void DrawChar(uint16_t Xpos, uint16_t Ypos, const uint8_t *c);
static void FillTriangle(uint16_t x1, uint16_t x2, uint16_t x3, uint16_t y1, uint16_t y2, uint16_t y3);
static void LL_FillBuffer(uint32_t LayerIndex, void *pDst, uint32_t xSize, uint32_t ySize, uint32_t OffLine, uint32_t ColorIndex);
static void LL_ConvertLineToARGB8888(void * pSrc, void *pDst, uint32_t xSize, uint32_t ColorMode);
/**
  * @}
  */

/** @defgroup STM32F769I-DISCOVERY_LCD_Exported_Functions LCD Exported Functions
  * @{
  */

/**
  * @brief  Initializes the DSI LCD.
  * @param  None
  * @retval LCD state
  */
uint8_t BSP_LCD_Init(void)
{
  return (BSP_LCD_InitEx(LCD_ORIENTATION_LANDSCAPE));
}

/**
  * @brief  Initializes the DSI LCD. 
  * The ititialization is done as below:
  *     - DSI PLL ititialization
  *     - DSI ititialization
  *     - LTDC ititialization
  *     - OTM8009A LCD Display IC Driver ititialization
  * @param  None
  * @retval LCD state
  */
uint8_t BSP_LCD_InitEx(LCD_OrientationTypeDef orientation)
{
  DSI_PLLInitTypeDef dsiPllInit;
  static RCC_PeriphCLKInitTypeDef  PeriphClkInitStruct;
  uint32_t LcdClock  = 27429; /*!< LcdClk = 27429 kHz */

  uint32_t laneByteClk_kHz = 0;
  uint32_t                   VSA; /*!< Vertical start active time in units of lines */
  uint32_t                   VBP; /*!< Vertical Back Porch time in units of lines */
  uint32_t                   VFP; /*!< Vertical Front Porch time in units of lines */
  uint32_t                   VACT; /*!< Vertical Active time in units of lines = imageSize Y in pixels to display */
  uint32_t                   HSA; /*!< Horizontal start active time in units of lcdClk */
  uint32_t                   HBP; /*!< Horizontal Back Porch time in units of lcdClk */
  uint32_t                   HFP; /*!< Horizontal Front Porch time in units of lcdClk */
  uint32_t                   HACT; /*!< Horizontal Active time in units of lcdClk = imageSize X in pixels to display */
  
  
  /* Toggle Hardware Reset of the DSI LCD using
  * its XRES signal (active low) */
  BSP_LCD_Reset();
  
  /* Call first MSP Initialize only in case of first initialization
  * This will set IP blocks LTDC, DSI and DMA2D
  * - out of reset
  * - clocked
  * - NVIC IRQ related to IP blocks enabled
  */
  BSP_LCD_MspInit();
  
/*************************DSI Initialization***********************************/  
  
  /* Base address of DSI Host/Wrapper registers to be set before calling De-Init */
  hdsi_discovery.Instance = DSI;
  
  HAL_DSI_DeInit(&(hdsi_discovery));
  
  dsiPllInit.PLLNDIV  = 100;
  dsiPllInit.PLLIDF   = DSI_PLL_IN_DIV5;
  dsiPllInit.PLLODF  = DSI_PLL_OUT_DIV1;
  laneByteClk_kHz = 62500; /* 500 MHz / 8 = 62.5 MHz = 62500 kHz */
  
  /* Set number of Lanes */
  hdsi_discovery.Init.NumberOfLanes = DSI_TWO_DATA_LANES;
  
  /* TXEscapeCkdiv = f(LaneByteClk)/15.62 = 4 */
  hdsi_discovery.Init.TXEscapeCkdiv = laneByteClk_kHz/15620; 
  
  HAL_DSI_Init(&(hdsi_discovery), &(dsiPllInit));

  /* Timing parameters for all Video modes
  * Set Timing parameters of LTDC depending on its chosen orientation
  */
  if(orientation == LCD_ORIENTATION_PORTRAIT)
  {
    VSA  = OTM8009A_480X800_VSYNC;        /* 12 */
    VBP  = OTM8009A_480X800_VBP;          /* 12 */
    VFP  = OTM8009A_480X800_VFP;          /* 12 */
    HSA  = OTM8009A_480X800_HSYNC;        /* 120 */
    HBP  = OTM8009A_480X800_HBP;          /* 120 */
    HFP  = OTM8009A_480X800_HFP;          /* 120 */
    lcd_x_size = OTM8009A_480X800_WIDTH;  /* 480 */
    lcd_y_size = OTM8009A_480X800_HEIGHT; /* 800 */                                
  }
  else
  {
    /* lcd_orientation == LCD_ORIENTATION_LANDSCAPE */
    VSA  = OTM8009A_800X480_VSYNC;        /* 12 */
    VBP  = OTM8009A_800X480_VBP;          /* 12 */
    VFP  = OTM8009A_800X480_VFP;          /* 12 */
    HSA  = OTM8009A_800X480_HSYNC;        /* 120 */
    HBP  = OTM8009A_800X480_HBP;          /* 120 */
    HFP  = OTM8009A_800X480_HFP;          /* 120 */
    lcd_x_size = OTM8009A_800X480_WIDTH;  /* 800 */
    lcd_y_size = OTM8009A_800X480_HEIGHT; /* 480 */                                
  }  
  
  HACT = lcd_x_size;
  VACT = lcd_y_size;
  
  
  hdsivideo_handle.VirtualChannelID = LCD_OTM8009A_ID;
  hdsivideo_handle.ColorCoding = LCD_DSI_PIXEL_DATA_FMT_RBG888;
  hdsivideo_handle.VSPolarity = DSI_VSYNC_ACTIVE_HIGH;
  hdsivideo_handle.HSPolarity = DSI_HSYNC_ACTIVE_HIGH;
  hdsivideo_handle.DEPolarity = DSI_DATA_ENABLE_ACTIVE_HIGH;  
  hdsivideo_handle.Mode = DSI_VID_MODE_BURST; /* Mode Video burst ie : one LgP per line */
  hdsivideo_handle.NullPacketSize = 0xFFF;
  hdsivideo_handle.NumberOfChunks = 0;
  hdsivideo_handle.PacketSize                = HACT; /* Value depending on display orientation choice portrait/landscape */ 
  hdsivideo_handle.HorizontalSyncActive      = (HSA * laneByteClk_kHz)/LcdClock;
  hdsivideo_handle.HorizontalBackPorch       = (HBP * laneByteClk_kHz)/LcdClock;
  hdsivideo_handle.HorizontalLine            = ((HACT + HSA + HBP + HFP) * laneByteClk_kHz)/LcdClock; /* Value depending on display orientation choice portrait/landscape */
  hdsivideo_handle.VerticalSyncActive        = VSA;
  hdsivideo_handle.VerticalBackPorch         = VBP;
  hdsivideo_handle.VerticalFrontPorch        = VFP;
  hdsivideo_handle.VerticalActive            = VACT; /* Value depending on display orientation choice portrait/landscape */
  
  /* Enable or disable sending LP command while streaming is active in video mode */
  hdsivideo_handle.LPCommandEnable = DSI_LP_COMMAND_ENABLE; /* Enable sending commands in mode LP (Low Power) */
  
  /* Largest packet size possible to transmit in LP mode in VSA, VBP, VFP regions */
  /* Only useful when sending LP packets is allowed while streaming is active in video mode */
  hdsivideo_handle.LPLargestPacketSize = 64;
  
  /* Largest packet size possible to transmit in LP mode in HFP region during VACT period */
  /* Only useful when sending LP packets is allowed while streaming is active in video mode */
  hdsivideo_handle.LPVACTLargestPacketSize = 64;
  
  
  /* Specify for each region of the video frame, if the transmission of command in LP mode is allowed in this region */
  /* while streaming is active in video mode                                                                         */
  hdsivideo_handle.LPHorizontalFrontPorchEnable = DSI_LP_HFP_ENABLE;   /* Allow sending LP commands during HFP period */
  hdsivideo_handle.LPHorizontalBackPorchEnable  = DSI_LP_HBP_ENABLE;   /* Allow sending LP commands during HBP period */
  hdsivideo_handle.LPVerticalActiveEnable = DSI_LP_VACT_ENABLE;  /* Allow sending LP commands during VACT period */
  hdsivideo_handle.LPVerticalFrontPorchEnable = DSI_LP_VFP_ENABLE;   /* Allow sending LP commands during VFP period */
  hdsivideo_handle.LPVerticalBackPorchEnable = DSI_LP_VBP_ENABLE;   /* Allow sending LP commands during VBP period */
  hdsivideo_handle.LPVerticalSyncActiveEnable = DSI_LP_VSYNC_ENABLE; /* Allow sending LP commands during VSync = VSA period */
  
  /* Configure DSI Video mode timings with settings set above */
  HAL_DSI_ConfigVideoMode(&(hdsi_discovery), &(hdsivideo_handle));
  
  /* Enable the DSI host and wrapper : but LTDC is not started yet at this stage */
  HAL_DSI_Start(&(hdsi_discovery));
/*************************End DSI Initialization*******************************/ 
  
  
/************************LTDC Initialization***********************************/  
  
  /* Timing Configuration */    
  hltdc_discovery.Init.HorizontalSync = (HSA - 1);
  hltdc_discovery.Init.AccumulatedHBP = (HSA + HBP - 1);
  hltdc_discovery.Init.AccumulatedActiveW = (lcd_x_size + HSA + HBP - 1);
  hltdc_discovery.Init.TotalWidth = (lcd_x_size + HSA + HBP + HFP - 1);
  
  /* Initialize the LCD pixel width and pixel height */
  hltdc_discovery.LayerCfg->ImageWidth  = lcd_x_size;
  hltdc_discovery.LayerCfg->ImageHeight = lcd_y_size;   
  
  
  /* LCD clock configuration */
  /* PLLSAI_VCO Input = HSE_VALUE/PLL_M = 1 Mhz */
  /* PLLSAI_VCO Output = PLLSAI_VCO Input * PLLSAIN = 384 Mhz */
  /* PLLLCDCLK = PLLSAI_VCO Output/PLLSAIR = 384 MHz / 7 = 54.857 MHz */
  /* LTDC clock frequency = PLLLCDCLK / LTDC_PLLSAI_DIVR_2 = 54.857 MHz / 2 = 27.429 MHz */
  PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_LTDC;
  PeriphClkInitStruct.PLLSAI.PLLSAIN = 384;
  PeriphClkInitStruct.PLLSAI.PLLSAIR = 7;
  PeriphClkInitStruct.PLLSAIDivR = RCC_PLLSAIDIVR_2;
  HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct); 
  
  /* Background value */
  hltdc_discovery.Init.Backcolor.Blue = 0;
  hltdc_discovery.Init.Backcolor.Green = 0;
  hltdc_discovery.Init.Backcolor.Red = 0;
  hltdc_discovery.Init.PCPolarity = LTDC_PCPOLARITY_IPC;
  hltdc_discovery.Instance = LTDC;
  
  /* Get LTDC Configuration from DSI Configuration */
  HAL_LTDC_StructInitFromVideoConfig(&(hltdc_discovery), &(hdsivideo_handle));
  
  /* Initialize the LTDC */  
  HAL_LTDC_Init(&hltdc_discovery);
  
#if !defined(DATA_IN_ExtSDRAM)
  /* Initialize the SDRAM */
  BSP_SDRAM_Init();
#endif /* DATA_IN_ExtSDRAM */
  
  /* Initialize the font */
  BSP_LCD_SetFont(&LCD_DEFAULT_FONT);
  
/************************End LTDC Initialization*******************************/
  
  
/***********************OTM8009A Initialization********************************/  
  
  /* Initialize the OTM8009A LCD Display IC Driver (KoD LCD IC Driver)
  *  depending on configuration set in 'hdsivideo_handle'.
  */
  OTM8009A_Init(hdsivideo_handle.ColorCoding, orientation);
  
/***********************End OTM8009A Initialization****************************/ 
  
  return LCD_OK; 
}

/**
  * @brief  BSP LCD Reset
  *         Hw reset the LCD DSI activating its XRES signal (active low for some time)
  *         and desactivating it later.
  */
void BSP_LCD_Reset(void)
{
  GPIO_InitTypeDef  gpio_init_structure;

  __HAL_RCC_GPIOJ_CLK_ENABLE();

    /* Configure the GPIO on PJ15 */
    gpio_init_structure.Pin   = GPIO_PIN_15;
    gpio_init_structure.Mode  = GPIO_MODE_OUTPUT_PP;
    gpio_init_structure.Pull  = GPIO_PULLUP;
    gpio_init_structure.Speed = GPIO_SPEED_HIGH;

    HAL_GPIO_Init(GPIOJ, &gpio_init_structure);

    /* Activate XRES active low */
    HAL_GPIO_WritePin(GPIOJ, GPIO_PIN_15, GPIO_PIN_RESET);

    HAL_Delay(20); /* wait 20 ms */

    /* Desactivate XRES */
    HAL_GPIO_WritePin(GPIOJ, GPIO_PIN_15, GPIO_PIN_SET);
    
    /* Wait for 10ms after releasing XRES before sending commands */
    HAL_Delay(10);
}

/**
  * @brief  Gets the LCD X size.
  * @retval Used LCD X size
  */
uint32_t BSP_LCD_GetXSize(void)
{
  return (lcd_x_size);
}

/**
  * @brief  Gets the LCD Y size.
  * @retval Used LCD Y size
  */
uint32_t BSP_LCD_GetYSize(void)
{
  return (lcd_y_size);
}

/**
  * @brief  Set the LCD X size.
  * @param  imageWidthPixels : uint32_t image width in pixels unit
  * @retval None
  */
void BSP_LCD_SetXSize(uint32_t imageWidthPixels)
{
  hltdc_discovery.LayerCfg[ActiveLayer].ImageWidth = imageWidthPixels;
}

/**
  * @brief  Set the LCD Y size.
  * @param  imageHeightPixels : uint32_t image height in lines unit
  */
void BSP_LCD_SetYSize(uint32_t imageHeightPixels)
{
  hltdc_discovery.LayerCfg[ActiveLayer].ImageHeight = imageHeightPixels;
}


/**
  * @brief  Initializes the LCD layers.
  * @param  LayerIndex: Layer foreground or background
  * @param  FB_Address: Layer frame buffer
  * @retval None
  */
void BSP_LCD_LayerDefaultInit(uint16_t LayerIndex, uint32_t FB_Address)
{
    LCD_LayerCfgTypeDef  Layercfg;

  /* Layer Init */
  Layercfg.WindowX0 = 0;
  Layercfg.WindowX1 = BSP_LCD_GetXSize();
  Layercfg.WindowY0 = 0;
  Layercfg.WindowY1 = BSP_LCD_GetYSize(); 
  Layercfg.PixelFormat = LTDC_PIXEL_FORMAT_ARGB8888;
  Layercfg.FBStartAdress = FB_Address;
  Layercfg.Alpha = 255;
  Layercfg.Alpha0 = 0;
  Layercfg.Backcolor.Blue = 0;
  Layercfg.Backcolor.Green = 0;
  Layercfg.Backcolor.Red = 0;
  Layercfg.BlendingFactor1 = LTDC_BLENDING_FACTOR1_PAxCA;
  Layercfg.BlendingFactor2 = LTDC_BLENDING_FACTOR2_PAxCA;
  Layercfg.ImageWidth = BSP_LCD_GetXSize();
  Layercfg.ImageHeight = BSP_LCD_GetYSize();
  
  HAL_LTDC_ConfigLayer(&hltdc_discovery, &Layercfg, LayerIndex); 
  
  DrawProp[LayerIndex].BackColor = LCD_COLOR_WHITE;
  DrawProp[LayerIndex].pFont     = &Font24;
  DrawProp[LayerIndex].TextColor = LCD_COLOR_BLACK;
}


/**
  * @brief  Selects the LCD Layer.
  * @param  LayerIndex: Layer foreground or background
  */
void BSP_LCD_SelectLayer(uint32_t LayerIndex)
{
  ActiveLayer = LayerIndex;
}

/**
  * @brief  Sets an LCD Layer visible
  * @param  LayerIndex: Visible Layer
  * @param  State: New state of the specified layer
  *          This parameter can be one of the following values:
  *            @arg  ENABLE
  *            @arg  DISABLE
  */
void BSP_LCD_SetLayerVisible(uint32_t LayerIndex, FunctionalState State)
{
  if(State == ENABLE)
  {
    __HAL_LTDC_LAYER_ENABLE(&(hltdc_discovery), LayerIndex);
  }
  else
  {
    __HAL_LTDC_LAYER_DISABLE(&(hltdc_discovery), LayerIndex);
  }
  __HAL_LTDC_RELOAD_CONFIG(&(hltdc_discovery));
  
}

/**
  * @brief  Configures the transparency.
  * @param  LayerIndex: Layer foreground or background.
  * @param  Transparency: Transparency
  *           This parameter must be a number between Min_Data = 0x00 and Max_Data = 0xFF
  */
void BSP_LCD_SetTransparency(uint32_t LayerIndex, uint8_t Transparency)
{
  
  HAL_LTDC_SetAlpha(&(hltdc_discovery), Transparency, LayerIndex);
  
}

/**
  * @brief  Sets an LCD layer frame buffer address.
  * @param  LayerIndex: Layer foreground or background
  * @param  Address: New LCD frame buffer value
  */
void BSP_LCD_SetLayerAddress(uint32_t LayerIndex, uint32_t Address)
{
  
  HAL_LTDC_SetAddress(&(hltdc_discovery), Address, LayerIndex);
  
}

/**
  * @brief  Sets display window.
  * @param  LayerIndex: Layer index
  * @param  Xpos: LCD X position
  * @param  Ypos: LCD Y position
  * @param  Width: LCD window width
  * @param  Height: LCD window height
  */
void BSP_LCD_SetLayerWindow(uint16_t LayerIndex, uint16_t Xpos, uint16_t Ypos, uint16_t Width, uint16_t Height)
{
  /* Reconfigure the layer size */
  HAL_LTDC_SetWindowSize(&(hltdc_discovery), Width, Height, LayerIndex);
  
  /* Reconfigure the layer position */
  HAL_LTDC_SetWindowPosition(&(hltdc_discovery), Xpos, Ypos, LayerIndex);
  
}

/**
  * @brief  Configures and sets the color keying.
  * @param  LayerIndex: Layer foreground or background
  * @param  RGBValue: Color reference
  */
void BSP_LCD_SetColorKeying(uint32_t LayerIndex, uint32_t RGBValue)
{
  /* Configure and Enable the color Keying for LCD Layer */
  HAL_LTDC_ConfigColorKeying(&(hltdc_discovery), RGBValue, LayerIndex);
  HAL_LTDC_EnableColorKeying(&(hltdc_discovery), LayerIndex);
}

/**
  * @brief  Disables the color keying.
  * @param  LayerIndex: Layer foreground or background
  */
void BSP_LCD_ResetColorKeying(uint32_t LayerIndex)
{
  /* Disable the color Keying for LCD Layer */
  HAL_LTDC_DisableColorKeying(&(hltdc_discovery), LayerIndex);
}

/**
  * @brief  Sets the LCD text color.
  * @param  Color: Text color code ARGB(8-8-8-8)
  */
void BSP_LCD_SetTextColor(uint32_t Color)
{
  DrawProp[ActiveLayer].TextColor = Color;
}

/**
  * @brief  Gets the LCD text color.
  * @retval Used text color.
  */
uint32_t BSP_LCD_GetTextColor(void)
{
  return DrawProp[ActiveLayer].TextColor;
}

/**
  * @brief  Sets the LCD background color.
  * @param  Color: Layer background color code ARGB(8-8-8-8)
  */
void BSP_LCD_SetBackColor(uint32_t Color)
{
  DrawProp[ActiveLayer].BackColor = Color;
}

/**
  * @brief  Gets the LCD background color.
  * @retval Used background color
  */
uint32_t BSP_LCD_GetBackColor(void)
{
  return DrawProp[ActiveLayer].BackColor;
}

/**
  * @brief  Sets the LCD text font.
  * @param  fonts: Layer font to be used
  */
void BSP_LCD_SetFont(sFONT *fonts)
{
  DrawProp[ActiveLayer].pFont = fonts;
}

/**
  * @brief  Gets the LCD text font.
  * @retval Used layer font
  */
sFONT *BSP_LCD_GetFont(void)
{
  return DrawProp[ActiveLayer].pFont;
}

/**
  * @brief  Reads an LCD pixel.
  * @param  Xpos: X position
  * @param  Ypos: Y position
  * @retval RGB pixel color
  */
uint32_t BSP_LCD_ReadPixel(uint16_t Xpos, uint16_t Ypos)
{
  uint32_t ret = 0;

  if(hltdc_discovery.LayerCfg[ActiveLayer].PixelFormat == LTDC_PIXEL_FORMAT_ARGB8888)
  {
    /* Read data value from SDRAM memory */
    ret = *(__IO uint32_t*) (hltdc_discovery.LayerCfg[ActiveLayer].FBStartAdress + (2*(Ypos*BSP_LCD_GetXSize() + Xpos)));
  }
  else if(hltdc_discovery.LayerCfg[ActiveLayer].PixelFormat == LTDC_PIXEL_FORMAT_RGB888)
  {
    /* Read data value from SDRAM memory */
    ret = (*(__IO uint32_t*) (hltdc_discovery.LayerCfg[ActiveLayer].FBStartAdress + (2*(Ypos*BSP_LCD_GetXSize() + Xpos))) & 0x00FFFFFF);
  }
  else if((hltdc_discovery.LayerCfg[ActiveLayer].PixelFormat == LTDC_PIXEL_FORMAT_RGB565) || \
          (hltdc_discovery.LayerCfg[ActiveLayer].PixelFormat == LTDC_PIXEL_FORMAT_ARGB4444) || \
          (hltdc_discovery.LayerCfg[ActiveLayer].PixelFormat == LTDC_PIXEL_FORMAT_AL88))
  {
    /* Read data value from SDRAM memory */
    ret = *(__IO uint16_t*) (hltdc_discovery.LayerCfg[ActiveLayer].FBStartAdress + (2*(Ypos*BSP_LCD_GetXSize() + Xpos)));
  }
  else
  {
    /* Read data value from SDRAM memory */
    ret = *(__IO uint8_t*) (hltdc_discovery.LayerCfg[ActiveLayer].FBStartAdress + (2*(Ypos*BSP_LCD_GetXSize() + Xpos)));
  }

  return ret;
}

/**
  * @brief  Clears the whole currently active layer of LTDC.
  * @param  Color: Color of the background
  */
void BSP_LCD_Clear(uint32_t Color)
{
  /* Clear the LCD */
  LL_FillBuffer(ActiveLayer, (uint32_t *)(hltdc_discovery.LayerCfg[ActiveLayer].FBStartAdress), BSP_LCD_GetXSize(), BSP_LCD_GetYSize(), 0, Color);
}

/**
  * @brief  Clears the selected line in currently active layer.
  * @param  Line: Line to be cleared
  */
void BSP_LCD_ClearStringLine(uint32_t Line)
{
  uint32_t color_backup = DrawProp[ActiveLayer].TextColor;
  DrawProp[ActiveLayer].TextColor = DrawProp[ActiveLayer].BackColor;

  /* Draw rectangle with background color */
  BSP_LCD_FillRect(0, (Line * DrawProp[ActiveLayer].pFont->Height), BSP_LCD_GetXSize(), DrawProp[ActiveLayer].pFont->Height);

  DrawProp[ActiveLayer].TextColor = color_backup;
  BSP_LCD_SetTextColor(DrawProp[ActiveLayer].TextColor);
}

/**
  * @brief  Displays one character in currently active layer.
  * @param  Xpos: Start column address
  * @param  Ypos: Line where to display the character shape.
  * @param  Ascii: Character ascii code
  *           This parameter must be a number between Min_Data = 0x20 and Max_Data = 0x7E
  */
void BSP_LCD_DisplayChar(uint16_t Xpos, uint16_t Ypos, uint8_t Ascii)
{
  DrawChar(Xpos, Ypos, &DrawProp[ActiveLayer].pFont->table[(Ascii-' ') *\
    DrawProp[ActiveLayer].pFont->Height * ((DrawProp[ActiveLayer].pFont->Width + 7) / 8)]);
}

/**
  * @brief  Displays characters in currently active layer.
  * @param  Xpos: X position (in pixel)
  * @param  Ypos: Y position (in pixel)
  * @param  Text: Pointer to string to display on LCD
  * @param  Mode: Display mode
  *          This parameter can be one of the following values:
  *            @arg  CENTER_MODE
  *            @arg  RIGHT_MODE
  *            @arg  LEFT_MODE
  */
void BSP_LCD_DisplayStringAt(uint16_t Xpos, uint16_t Ypos, uint8_t *Text, Text_AlignModeTypdef Mode)
{
  uint16_t refcolumn = 1, i = 0;
  uint32_t size = 0, xsize = 0;
  uint8_t  *ptr = Text;

  /* Get the text size */
  while (*ptr++) size ++ ;

  /* Characters number per line */
  xsize = (BSP_LCD_GetXSize()/DrawProp[ActiveLayer].pFont->Width);

  switch (Mode)
  {
  case CENTER_MODE:
    {
      refcolumn = Xpos + ((xsize - size)* DrawProp[ActiveLayer].pFont->Width) / 2;
      break;
    }
  case LEFT_MODE:
    {
      refcolumn = Xpos;
      break;
    }
  case RIGHT_MODE:
    {
      refcolumn = - Xpos + ((xsize - size)*DrawProp[ActiveLayer].pFont->Width);
      break;
    }
  default:
    {
      refcolumn = Xpos;
      break;
    }
  }

  /* Check that the Start column is located in the screen */
  if ((refcolumn < 1) || (refcolumn >= 0x8000))
  {
    refcolumn = 1;
  }

  /* Send the string character by character on LCD */
  while ((*Text != 0) & (((BSP_LCD_GetXSize() - (i*DrawProp[ActiveLayer].pFont->Width)) & 0xFFFF) >= DrawProp[ActiveLayer].pFont->Width))
  {
    /* Display one character on LCD */
    BSP_LCD_DisplayChar(refcolumn, Ypos, *Text);
    /* Decrement the column position by 16 */
    refcolumn += DrawProp[ActiveLayer].pFont->Width;

    /* Point on the next character */
    Text++;
    i++;
  }

}

/**
  * @brief  Displays a maximum of 60 characters on the LCD.
  * @param  Line: Line where to display the character shape
  * @param  ptr: Pointer to string to display on LCD
  */
void BSP_LCD_DisplayStringAtLine(uint16_t Line, uint8_t *ptr)
{
  BSP_LCD_DisplayStringAt(0, LINE(Line), ptr, LEFT_MODE);
}

/**
  * @brief  Draws an horizontal line in currently active layer.
  * @param  Xpos: X position
  * @param  Ypos: Y position
  * @param  Length: Line length
  */
void BSP_LCD_DrawHLine(uint16_t Xpos, uint16_t Ypos, uint16_t Length)
{
  uint32_t  Xaddress = 0;

  /* Get the line address */
  Xaddress = (hltdc_discovery.LayerCfg[ActiveLayer].FBStartAdress) + 4*(BSP_LCD_GetXSize()*Ypos + Xpos);

  /* Write line */
  LL_FillBuffer(ActiveLayer, (uint32_t *)Xaddress, Length, 1, 0, DrawProp[ActiveLayer].TextColor);
}

/**
  * @brief  Draws a vertical line in currently active layer.
  * @param  Xpos: X position
  * @param  Ypos: Y position
  * @param  Length: Line length
  */
void BSP_LCD_DrawVLine(uint16_t Xpos, uint16_t Ypos, uint16_t Length)
{
  uint32_t  Xaddress = 0;

  /* Get the line address */
  Xaddress = (hltdc_discovery.LayerCfg[ActiveLayer].FBStartAdress) + 4*(BSP_LCD_GetXSize()*Ypos + Xpos);

  /* Write line */
  LL_FillBuffer(ActiveLayer, (uint32_t *)Xaddress, 1, Length, (BSP_LCD_GetXSize() - 1), DrawProp[ActiveLayer].TextColor);
}

/**
  * @brief  Draws an uni-line (between two points) in currently active layer.
  * @param  x1: Point 1 X position
  * @param  y1: Point 1 Y position
  * @param  x2: Point 2 X position
  * @param  y2: Point 2 Y position
  */
void BSP_LCD_DrawLine(uint16_t x1, uint16_t y1, uint16_t x2, uint16_t y2)
{
  int16_t deltax = 0, deltay = 0, x = 0, y = 0, xinc1 = 0, xinc2 = 0,
  yinc1 = 0, yinc2 = 0, den = 0, num = 0, numadd = 0, numpixels = 0,
  curpixel = 0;

  deltax = ABS(x2 - x1);        /* The difference between the x's */
  deltay = ABS(y2 - y1);        /* The difference between the y's */
  x = x1;                       /* Start x off at the first pixel */
  y = y1;                       /* Start y off at the first pixel */

  if (x2 >= x1)                 /* The x-values are increasing */
  {
    xinc1 = 1;
    xinc2 = 1;
  }
  else                          /* The x-values are decreasing */
  {
    xinc1 = -1;
    xinc2 = -1;
  }

  if (y2 >= y1)                 /* The y-values are increasing */
  {
    yinc1 = 1;
    yinc2 = 1;
  }
  else                          /* The y-values are decreasing */
  {
    yinc1 = -1;
    yinc2 = -1;
  }

  if (deltax >= deltay)         /* There is at least one x-value for every y-value */
  {
    xinc1 = 0;                  /* Don't change the x when numerator >= denominator */
    yinc2 = 0;                  /* Don't change the y for every iteration */
    den = deltax;
    num = deltax / 2;
    numadd = deltay;
    numpixels = deltax;         /* There are more x-values than y-values */
  }
  else                          /* There is at least one y-value for every x-value */
  {
    xinc2 = 0;                  /* Don't change the x for every iteration */
    yinc1 = 0;                  /* Don't change the y when numerator >= denominator */
    den = deltay;
    num = deltay / 2;
    numadd = deltax;
    numpixels = deltay;         /* There are more y-values than x-values */
  }

  for (curpixel = 0; curpixel <= numpixels; curpixel++)
  {
    BSP_LCD_DrawPixel(x, y, DrawProp[ActiveLayer].TextColor);   /* Draw the current pixel */
    num += numadd;                            /* Increase the numerator by the top of the fraction */
    if (num >= den)                           /* Check if numerator >= denominator */
    {
      num -= den;                             /* Calculate the new numerator value */
      x += xinc1;                             /* Change the x as appropriate */
      y += yinc1;                             /* Change the y as appropriate */
    }
    x += xinc2;                               /* Change the x as appropriate */
    y += yinc2;                               /* Change the y as appropriate */
  }
}

/**
  * @brief  Draws a rectangle in currently active layer.
  * @param  Xpos: X position
  * @param  Ypos: Y position
  * @param  Width: Rectangle width
  * @param  Height: Rectangle height
  */
void BSP_LCD_DrawRect(uint16_t Xpos, uint16_t Ypos, uint16_t Width, uint16_t Height)
{
  /* Draw horizontal lines */
  BSP_LCD_DrawHLine(Xpos, Ypos, Width);
  BSP_LCD_DrawHLine(Xpos, (Ypos+ Height), Width);

  /* Draw vertical lines */
  BSP_LCD_DrawVLine(Xpos, Ypos, Height);
  BSP_LCD_DrawVLine((Xpos + Width), Ypos, Height);
}

/**
  * @brief  Draws a circle in currently active layer.
  * @param  Xpos: X position
  * @param  Ypos: Y position
  * @param  Radius: Circle radius
  */
void BSP_LCD_DrawCircle(uint16_t Xpos, uint16_t Ypos, uint16_t Radius)
{
  int32_t   D;    /* Decision Variable */
  uint32_t  CurX; /* Current X Value */
  uint32_t  CurY; /* Current Y Value */

  D = 3 - (Radius << 1);
  CurX = 0;
  CurY = Radius;

  while (CurX <= CurY)
  {
    BSP_LCD_DrawPixel((Xpos + CurX), (Ypos - CurY), DrawProp[ActiveLayer].TextColor);

    BSP_LCD_DrawPixel((Xpos - CurX), (Ypos - CurY), DrawProp[ActiveLayer].TextColor);

    BSP_LCD_DrawPixel((Xpos + CurY), (Ypos - CurX), DrawProp[ActiveLayer].TextColor);

    BSP_LCD_DrawPixel((Xpos - CurY), (Ypos - CurX), DrawProp[ActiveLayer].TextColor);

    BSP_LCD_DrawPixel((Xpos + CurX), (Ypos + CurY), DrawProp[ActiveLayer].TextColor);

    BSP_LCD_DrawPixel((Xpos - CurX), (Ypos + CurY), DrawProp[ActiveLayer].TextColor);

    BSP_LCD_DrawPixel((Xpos + CurY), (Ypos + CurX), DrawProp[ActiveLayer].TextColor);

    BSP_LCD_DrawPixel((Xpos - CurY), (Ypos + CurX), DrawProp[ActiveLayer].TextColor);

    if (D < 0)
    {
      D += (CurX << 2) + 6;
    }
    else
    {
      D += ((CurX - CurY) << 2) + 10;
      CurY--;
    }
    CurX++;
  }
}

/**
  * @brief  Draws an poly-line (between many points) in currently active layer.
  * @param  Points: Pointer to the points array
  * @param  PointCount: Number of points
  */
void BSP_LCD_DrawPolygon(pPoint Points, uint16_t PointCount)
{
  int16_t X = 0, Y = 0;

  if(PointCount < 2)
  {
    return;
  }

  BSP_LCD_DrawLine(Points->X, Points->Y, (Points+PointCount-1)->X, (Points+PointCount-1)->Y);

  while(--PointCount)
  {
    X = Points->X;
    Y = Points->Y;
    Points++;
    BSP_LCD_DrawLine(X, Y, Points->X, Points->Y);
  }
}

/**
  * @brief  Draws an ellipse on LCD in currently active layer.
  * @param  Xpos: X position
  * @param  Ypos: Y position
  * @param  XRadius: Ellipse X radius
  * @param  YRadius: Ellipse Y radius
  */
void BSP_LCD_DrawEllipse(int Xpos, int Ypos, int XRadius, int YRadius)
{
  int x = 0, y = -YRadius, err = 2-2*XRadius, e2;
  float K = 0, rad1 = 0, rad2 = 0;

  rad1 = XRadius;
  rad2 = YRadius;

  K = (float)(rad2/rad1);

  do {
    BSP_LCD_DrawPixel((Xpos-(uint16_t)(x/K)), (Ypos+y), DrawProp[ActiveLayer].TextColor);
    BSP_LCD_DrawPixel((Xpos+(uint16_t)(x/K)), (Ypos+y), DrawProp[ActiveLayer].TextColor);
    BSP_LCD_DrawPixel((Xpos+(uint16_t)(x/K)), (Ypos-y), DrawProp[ActiveLayer].TextColor);
    BSP_LCD_DrawPixel((Xpos-(uint16_t)(x/K)), (Ypos-y), DrawProp[ActiveLayer].TextColor);

    e2 = err;
    if (e2 <= x) {
      err += ++x*2+1;
      if (-y == x && e2 <= y) e2 = 0;
    }
    if (e2 > y) err += ++y*2+1;
  }
  while (y <= 0);
}

/**
  * @brief  Draws a bitmap picture loaded in the internal Flash (32 bpp) in currently active layer.
  * @param  Xpos: Bmp X position in the LCD
  * @param  Ypos: Bmp Y position in the LCD
  * @param  pbmp: Pointer to Bmp picture address in the internal Flash
  */
void BSP_LCD_DrawBitmap(uint32_t Xpos, uint32_t Ypos, uint8_t *pbmp)
{
  uint32_t index = 0, width = 0, height = 0, bit_pixel = 0;
  uint32_t Address;
  uint32_t InputColorMode = 0;

  /* Get bitmap data address offset */
  index = *(__IO uint16_t *) (pbmp + 10);
  index |= (*(__IO uint16_t *) (pbmp + 12)) << 16;

  /* Read bitmap width */
  width = *(uint16_t *) (pbmp + 18);
  width |= (*(uint16_t *) (pbmp + 20)) << 16;

  /* Read bitmap height */
  height = *(uint16_t *) (pbmp + 22);
  height |= (*(uint16_t *) (pbmp + 24)) << 16;

  /* Read bit/pixel */
  bit_pixel = *(uint16_t *) (pbmp + 28);

  /* Set the address */
  Address = hltdc_discovery.LayerCfg[ActiveLayer].FBStartAdress + (((BSP_LCD_GetXSize()*Ypos) + Xpos)*(4));

  /* Get the layer pixel format */
  if ((bit_pixel/8) == 4)
  {
    InputColorMode = DMA2D_INPUT_ARGB8888;
  }
  else if ((bit_pixel/8) == 2)
  {
    InputColorMode = DMA2D_INPUT_RGB565;
  }
  else
  {
    InputColorMode = DMA2D_INPUT_RGB888;
  }

  /* Bypass the bitmap header */
  pbmp += (index + (width * (height - 1) * (bit_pixel/8)));

  /* Convert picture to ARGB8888 pixel format */
  for(index=0; index < height; index++)
  {
    /* Pixel format conversion */
    LL_ConvertLineToARGB8888((uint32_t *)pbmp, (uint32_t *)Address, width, InputColorMode);

    /* Increment the source and destination buffers */
    Address+=  (BSP_LCD_GetXSize()*4);
    pbmp -= width*(bit_pixel/8);
  }
}

/**
  * @brief  Draws a full rectangle in currently active layer.
  * @param  Xpos: X position
  * @param  Ypos: Y position
  * @param  Width: Rectangle width
  * @param  Height: Rectangle height
  */
void BSP_LCD_FillRect(uint16_t Xpos, uint16_t Ypos, uint16_t Width, uint16_t Height)
{
  uint32_t  Xaddress = 0;

  /* Set the text color */
  BSP_LCD_SetTextColor(DrawProp[ActiveLayer].TextColor);

  /* Get the rectangle start address */
  Xaddress = (hltdc_discovery.LayerCfg[ActiveLayer].FBStartAdress) + 4*(BSP_LCD_GetXSize()*Ypos + Xpos);

  /* Fill the rectangle */
  LL_FillBuffer(ActiveLayer, (uint32_t *)Xaddress, Width, Height, (BSP_LCD_GetXSize() - Width), DrawProp[ActiveLayer].TextColor);
}

/**
  * @brief  Draws a full circle in currently active layer.
  * @param  Xpos: X position
  * @param  Ypos: Y position
  * @param  Radius: Circle radius
  */
void BSP_LCD_FillCircle(uint16_t Xpos, uint16_t Ypos, uint16_t Radius)
{
  int32_t  D;     /* Decision Variable */
  uint32_t  CurX; /* Current X Value */
  uint32_t  CurY; /* Current Y Value */

  D = 3 - (Radius << 1);

  CurX = 0;
  CurY = Radius;

  BSP_LCD_SetTextColor(DrawProp[ActiveLayer].TextColor);

  while (CurX <= CurY)
  {
    if(CurY > 0)
    {
      BSP_LCD_DrawHLine(Xpos - CurY, Ypos + CurX, 2*CurY);
      BSP_LCD_DrawHLine(Xpos - CurY, Ypos - CurX, 2*CurY);
    }

    if(CurX > 0)
    {
      BSP_LCD_DrawHLine(Xpos - CurX, Ypos - CurY, 2*CurX);
      BSP_LCD_DrawHLine(Xpos - CurX, Ypos + CurY, 2*CurX);
    }
    if (D < 0)
    {
      D += (CurX << 2) + 6;
    }
    else
    {
      D += ((CurX - CurY) << 2) + 10;
      CurY--;
    }
    CurX++;
  }

  BSP_LCD_SetTextColor(DrawProp[ActiveLayer].TextColor);
  BSP_LCD_DrawCircle(Xpos, Ypos, Radius);
}

/**
  * @brief  Draws a full poly-line (between many points) in currently active layer.
  * @param  Points: Pointer to the points array
  * @param  PointCount: Number of points
  */
void BSP_LCD_FillPolygon(pPoint Points, uint16_t PointCount)
{
  int16_t X = 0, Y = 0, X2 = 0, Y2 = 0, X_center = 0, Y_center = 0, X_first = 0, Y_first = 0, pixelX = 0, pixelY = 0, counter = 0;
  uint16_t  IMAGE_LEFT = 0, IMAGE_RIGHT = 0, IMAGE_TOP = 0, IMAGE_BOTTOM = 0;

  IMAGE_LEFT = IMAGE_RIGHT = Points->X;
  IMAGE_TOP= IMAGE_BOTTOM = Points->Y;

  for(counter = 1; counter < PointCount; counter++)
  {
    pixelX = POLY_X(counter);
    if(pixelX < IMAGE_LEFT)
    {
      IMAGE_LEFT = pixelX;
    }
    if(pixelX > IMAGE_RIGHT)
    {
      IMAGE_RIGHT = pixelX;
    }

    pixelY = POLY_Y(counter);
    if(pixelY < IMAGE_TOP)
    {
      IMAGE_TOP = pixelY;
    }
    if(pixelY > IMAGE_BOTTOM)
    {
      IMAGE_BOTTOM = pixelY;
    }
  }

  if(PointCount < 2)
  {
    return;
  }

  X_center = (IMAGE_LEFT + IMAGE_RIGHT)/2;
  Y_center = (IMAGE_BOTTOM + IMAGE_TOP)/2;

  X_first = Points->X;
  Y_first = Points->Y;

  while(--PointCount)
  {
    X = Points->X;
    Y = Points->Y;
    Points++;
    X2 = Points->X;
    Y2 = Points->Y;

    FillTriangle(X, X2, X_center, Y, Y2, Y_center);
    FillTriangle(X, X_center, X2, Y, Y_center, Y2);
    FillTriangle(X_center, X2, X, Y_center, Y2, Y);
  }

  FillTriangle(X_first, X2, X_center, Y_first, Y2, Y_center);
  FillTriangle(X_first, X_center, X2, Y_first, Y_center, Y2);
  FillTriangle(X_center, X2, X_first, Y_center, Y2, Y_first);
}

/**
  * @brief  Draws a full ellipse in currently active layer.
  * @param  Xpos: X position
  * @param  Ypos: Y position
  * @param  XRadius: Ellipse X radius
  * @param  YRadius: Ellipse Y radius
  */
void BSP_LCD_FillEllipse(int Xpos, int Ypos, int XRadius, int YRadius)
{
  int x = 0, y = -YRadius, err = 2-2*XRadius, e2;
  float K = 0, rad1 = 0, rad2 = 0;

  rad1 = XRadius;
  rad2 = YRadius;

  K = (float)(rad2/rad1);

  do
  {
    BSP_LCD_DrawHLine((Xpos-(uint16_t)(x/K)), (Ypos+y), (2*(uint16_t)(x/K) + 1));
    BSP_LCD_DrawHLine((Xpos-(uint16_t)(x/K)), (Ypos-y), (2*(uint16_t)(x/K) + 1));

    e2 = err;
    if (e2 <= x)
    {
      err += ++x*2+1;
      if (-y == x && e2 <= y) e2 = 0;
    }
    if (e2 > y) err += ++y*2+1;
  }
  while (y <= 0);
}

/**
  * @brief  Switch back on the display if was switched off by previous call of BSP_LCD_DisplayOff().
  *         Exit DSI ULPM mode if was allowed and configured in Dsi Configuration.
  */
void BSP_LCD_DisplayOn(void)
{
  /* Send Display on DCS command to display */
  HAL_DSI_ShortWrite(&(hdsi_discovery),
                     hdsivideo_handle.VirtualChannelID,
                     DSI_DCS_SHORT_PKT_WRITE_P1,
                     OTM8009A_CMD_DISPON,
                     0x00);
  
}

/**
  * @brief  Switch Off the display.
  *         Enter DSI ULPM mode if was allowed and configured in Dsi Configuration.
  */
void BSP_LCD_DisplayOff(void)
{
  /* Send Display off DCS Command to display */
  HAL_DSI_ShortWrite(&(hdsi_discovery),
                     hdsivideo_handle.VirtualChannelID,
                     DSI_DCS_SHORT_PKT_WRITE_P1,
                     OTM8009A_CMD_DISPOFF,
                     0x00);
  
}

/**
  * @brief  Set the brightness value 
  * @param  BrightnessValue: [00: Min (black), 100 Max]
  */
void BSP_LCD_SetBrightness(uint8_t BrightnessValue)
{
  /* Send Display on DCS command to display */
   HAL_DSI_ShortWrite(&hdsi_discovery, 
                      LCD_OTM8009A_ID, 
                      DSI_DCS_SHORT_PKT_WRITE_P1, 
                      OTM8009A_CMD_WRDISBV, (uint16_t)(BrightnessValue * 255)/100); 
  
}

/**
  * @brief  DCS or Generic short/long write command
  * @param  NbParams: Number of parameters. It indicates the write command mode:
  *                 If inferior to 2, a long write command is performed else short.
  * @param  pParams: Pointer to parameter values table.
  * @retval HAL status
  */
void DSI_IO_WriteCmd(uint32_t NbrParams, uint8_t *pParams)
{
  if(NbrParams <= 1)
  {
   HAL_DSI_ShortWrite(&hdsi_discovery, LCD_OTM8009A_ID, DSI_DCS_SHORT_PKT_WRITE_P1, pParams[0], pParams[1]); 
  }
  else
  {
   HAL_DSI_LongWrite(&hdsi_discovery,  LCD_OTM8009A_ID, DSI_DCS_LONG_PKT_WRITE, NbrParams, pParams[NbrParams], pParams); 
  } 
}

/*******************************************************************************
                       LTDC, DMA2D and DSI BSP Routines
*******************************************************************************/
/**
  * @brief  De-Initializes the BSP LCD Msp
  * Application can surcharge if needed this function implementation.
  */
__weak void BSP_LCD_MspDeInit(void)
{
  /** @brief Disable IRQ of LTDC IP */
  HAL_NVIC_DisableIRQ(LTDC_IRQn);

  /** @brief Disable IRQ of DMA2D IP */
  HAL_NVIC_DisableIRQ(DMA2D_IRQn);

  /** @brief Disable IRQ of DSI IP */
  HAL_NVIC_DisableIRQ(DSI_IRQn);

  /** @brief Force and let in reset state LTDC, DMA2D and DSI Host + Wrapper IPs */
  __HAL_RCC_LTDC_FORCE_RESET();
  __HAL_RCC_DMA2D_FORCE_RESET();
  __HAL_RCC_DSI_FORCE_RESET();

  /** @brief Disable the LTDC, DMA2D and DSI Host and Wrapper clocks */
  __HAL_RCC_LTDC_CLK_DISABLE();
  __HAL_RCC_DMA2D_CLK_DISABLE();
  __HAL_RCC_DSI_CLK_DISABLE();
}

/**
  * @brief  Initialize the BSP LCD Msp.
  * Application can surcharge if needed this function implementation
  */
__weak void BSP_LCD_MspInit(void)
{
  /** @brief Enable the LTDC clock */
  __HAL_RCC_LTDC_CLK_ENABLE();

  /** @brief Toggle Sw reset of LTDC IP */
  __HAL_RCC_LTDC_FORCE_RESET();
  __HAL_RCC_LTDC_RELEASE_RESET();

  /** @brief Enable the DMA2D clock */
  __HAL_RCC_DMA2D_CLK_ENABLE();

  /** @brief Toggle Sw reset of DMA2D IP */
  __HAL_RCC_DMA2D_FORCE_RESET();
  __HAL_RCC_DMA2D_RELEASE_RESET();

  /** @brief Enable DSI Host and wrapper clocks */
  __HAL_RCC_DSI_CLK_ENABLE();

  /** @brief Soft Reset the DSI Host and wrapper */
  __HAL_RCC_DSI_FORCE_RESET();
  __HAL_RCC_DSI_RELEASE_RESET();

  /** @brief NVIC configuration for LTDC interrupt that is now enabled */
  HAL_NVIC_SetPriority(LTDC_IRQn, 3, 0);
  HAL_NVIC_EnableIRQ(LTDC_IRQn);

  /** @brief NVIC configuration for DMA2D interrupt that is now enabled */
  HAL_NVIC_SetPriority(DMA2D_IRQn, 3, 0);
  HAL_NVIC_EnableIRQ(DMA2D_IRQn);

  /** @brief NVIC configuration for DSI interrupt that is now enabled */
  HAL_NVIC_SetPriority(DSI_IRQn, 3, 0);
  HAL_NVIC_EnableIRQ(DSI_IRQn);
}

/**
  * @brief  Draws a pixel on LCD.
  * @param  Xpos: X position
  * @param  Ypos: Y position
  * @param  RGB_Code: Pixel color in ARGB mode (8-8-8-8)
  */
void BSP_LCD_DrawPixel(uint16_t Xpos, uint16_t Ypos, uint32_t RGB_Code)
{
  /* Write data value to all SDRAM memory */
  *(__IO uint32_t*) (hltdc_discovery.LayerCfg[ActiveLayer].FBStartAdress + (4*(Ypos*BSP_LCD_GetXSize() + Xpos))) = RGB_Code;
}


/**
  * @brief  Draws a character on LCD.
  * @param  Xpos: Line where to display the character shape
  * @param  Ypos: Start column address
  * @param  c: Pointer to the character data
  */
static void DrawChar(uint16_t Xpos, uint16_t Ypos, const uint8_t *c)
{
  uint32_t i = 0, j = 0;
  uint16_t height, width;
  uint8_t  offset;
  uint8_t  *pchar;
  uint32_t line;

  height = DrawProp[ActiveLayer].pFont->Height;
  width  = DrawProp[ActiveLayer].pFont->Width;

  offset =  8 *((width + 7)/8) -  width ;

  for(i = 0; i < height; i++)
  {
    pchar = ((uint8_t *)c + (width + 7)/8 * i);

    switch(((width + 7)/8))
    {

    case 1:
      line =  pchar[0];
      break;

    case 2:
      line =  (pchar[0]<< 8) | pchar[1];
      break;

    case 3:
    default:
      line =  (pchar[0]<< 16) | (pchar[1]<< 8) | pchar[2];
      break;
    }

    for (j = 0; j < width; j++)
    {
      if(line & (1 << (width- j + offset- 1)))
      {
        BSP_LCD_DrawPixel((Xpos + j), Ypos, DrawProp[ActiveLayer].TextColor);
      }
      else
      {
        BSP_LCD_DrawPixel((Xpos + j), Ypos, DrawProp[ActiveLayer].BackColor);
      }
    }
    Ypos++;
  }
}

/**
  * @brief  Fills a triangle (between 3 points).
  * @param  x1: Point 1 X position
  * @param  y1: Point 1 Y position
  * @param  x2: Point 2 X position
  * @param  y2: Point 2 Y position
  * @param  x3: Point 3 X position
  * @param  y3: Point 3 Y position
  */
static void FillTriangle(uint16_t x1, uint16_t x2, uint16_t x3, uint16_t y1, uint16_t y2, uint16_t y3)
{
  int16_t deltax = 0, deltay = 0, x = 0, y = 0, xinc1 = 0, xinc2 = 0,
  yinc1 = 0, yinc2 = 0, den = 0, num = 0, numadd = 0, numpixels = 0,
  curpixel = 0;

  deltax = ABS(x2 - x1);        /* The difference between the x's */
  deltay = ABS(y2 - y1);        /* The difference between the y's */
  x = x1;                       /* Start x off at the first pixel */
  y = y1;                       /* Start y off at the first pixel */

  if (x2 >= x1)                 /* The x-values are increasing */
  {
    xinc1 = 1;
    xinc2 = 1;
  }
  else                          /* The x-values are decreasing */
  {
    xinc1 = -1;
    xinc2 = -1;
  }

  if (y2 >= y1)                 /* The y-values are increasing */
  {
    yinc1 = 1;
    yinc2 = 1;
  }
  else                          /* The y-values are decreasing */
  {
    yinc1 = -1;
    yinc2 = -1;
  }

  if (deltax >= deltay)         /* There is at least one x-value for every y-value */
  {
    xinc1 = 0;                  /* Don't change the x when numerator >= denominator */
    yinc2 = 0;                  /* Don't change the y for every iteration */
    den = deltax;
    num = deltax / 2;
    numadd = deltay;
    numpixels = deltax;         /* There are more x-values than y-values */
  }
  else                          /* There is at least one y-value for every x-value */
  {
    xinc2 = 0;                  /* Don't change the x for every iteration */
    yinc1 = 0;                  /* Don't change the y when numerator >= denominator */
    den = deltay;
    num = deltay / 2;
    numadd = deltax;
    numpixels = deltay;         /* There are more y-values than x-values */
  }

  for (curpixel = 0; curpixel <= numpixels; curpixel++)
  {
    BSP_LCD_DrawLine(x, y, x3, y3);

    num += numadd;              /* Increase the numerator by the top of the fraction */
    if (num >= den)             /* Check if numerator >= denominator */
    {
      num -= den;               /* Calculate the new numerator value */
      x += xinc1;               /* Change the x as appropriate */
      y += yinc1;               /* Change the y as appropriate */
    }
    x += xinc2;                 /* Change the x as appropriate */
    y += yinc2;                 /* Change the y as appropriate */
  }
}

/**
  * @brief  Fills a buffer.
  * @param  LayerIndex: Layer index
  * @param  pDst: Pointer to destination buffer
  * @param  xSize: Buffer width
  * @param  ySize: Buffer height
  * @param  OffLine: Offset
  * @param  ColorIndex: Color index
  */
static void LL_FillBuffer(uint32_t LayerIndex, void *pDst, uint32_t xSize, uint32_t ySize, uint32_t OffLine, uint32_t ColorIndex)
{
  /* Register to memory mode with ARGB8888 as color Mode */
  hdma2d_discovery.Init.Mode         = DMA2D_R2M;
  hdma2d_discovery.Init.ColorMode    = DMA2D_OUTPUT_ARGB8888;
  hdma2d_discovery.Init.OutputOffset = OffLine;

  hdma2d_discovery.Instance = DMA2D;

  /* DMA2D Initialization */
  if(HAL_DMA2D_Init(&hdma2d_discovery) == HAL_OK)
  {
    if(HAL_DMA2D_ConfigLayer(&hdma2d_discovery, LayerIndex) == HAL_OK)
    {
      if (HAL_DMA2D_Start(&hdma2d_discovery, ColorIndex, (uint32_t)pDst, xSize, ySize) == HAL_OK)
      {
        /* Polling For DMA transfer */
        HAL_DMA2D_PollForTransfer(&hdma2d_discovery, 10);
      }
    }
  }
}

/**
  * @brief  Converts a line to an ARGB8888 pixel format.
  * @param  pSrc: Pointer to source buffer
  * @param  pDst: Output color
  * @param  xSize: Buffer width
  * @param  ColorMode: Input color mode
  */
static void LL_ConvertLineToARGB8888(void *pSrc, void *pDst, uint32_t xSize, uint32_t ColorMode)
{
  /* Configure the DMA2D Mode, Color Mode and output offset */
  hdma2d_discovery.Init.Mode         = DMA2D_M2M_PFC;
  hdma2d_discovery.Init.ColorMode    = DMA2D_OUTPUT_ARGB8888;
  hdma2d_discovery.Init.OutputOffset = 0;

  /* Foreground Configuration */
  hdma2d_discovery.LayerCfg[1].AlphaMode = DMA2D_NO_MODIF_ALPHA;
  hdma2d_discovery.LayerCfg[1].InputAlpha = 0xFF;
  hdma2d_discovery.LayerCfg[1].InputColorMode = ColorMode;
  hdma2d_discovery.LayerCfg[1].InputOffset = 0;

  hdma2d_discovery.Instance = DMA2D;

  /* DMA2D Initialization */
  if(HAL_DMA2D_Init(&hdma2d_discovery) == HAL_OK)
  {
    if(HAL_DMA2D_ConfigLayer(&hdma2d_discovery, 1) == HAL_OK)
    {
      if (HAL_DMA2D_Start(&hdma2d_discovery, (uint32_t)pSrc, (uint32_t)pDst, xSize, 1) == HAL_OK)
      {
        /* Polling For DMA transfer */
        HAL_DMA2D_PollForTransfer(&hdma2d_discovery, 10);
      }
    }
  }
}

/**
  * @}
  */

/**
  * @}
  */

/**
  * @}
  */

/**
  * @}
  */

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
