YUV device (Sample)

GUI_YUV_PixelData.c
Sample showing the YUV color data for a selected pixel.
File(s) required	GUI_YUV_PixelData.c
Runs in simulation	No
Runs on target	Yes
Download	GUI_YUV_PixelData.c

This sample demonstrates how YUV devices are created in emWin and how the user can read the data from a YUV device. Note that with the current emWin Version (V6.12), this sample cannot be executed in the simulation, but only on targets.

Code

/*********************************************************************
*                    SEGGER Microcontroller GmbH                     *
*        Solutions for real time microcontroller applications        *
**********************************************************************
*                                                                    *
*        (c) 1996 - 2020  SEGGER Microcontroller GmbH                *
*                                                                    *
*        Internet: www.segger.com    Support:  support@segger.com    *
*                                                                    *
**********************************************************************

** emWin V6.10 - Graphical user interface for embedded applications **
emWin is protected by international copyright laws.   Knowledge of the
source code may not be used to write a similar product.  This file may
only  be used  in accordance  with  a license  and should  not be  re-
distributed in any way. We appreciate your understanding and fairness.
----------------------------------------------------------------------
File        : GUI_YUV_PixelData.c
Purpose     : Sample that demonstrates how pixel colors can be read
              from the buffer of a YUV device in emWin.
Note        : Please note that YUV devices are supported only by
              display drivers with direct interface like GUIDRV_Lin.
Requirements: WindowManager - (x)
              MemoryDevices - ( )
              AntiAliasing  - ( )
              VNC-Server    - ( )
              PNG-Library   - ( )
              TrueTypeFonts - ( )
---------------------------END-OF-HEADER------------------------------
*/

#ifdef WIN32
#error "This sample does not currently work in the Windows Simulation."
#endif

#include "DIALOG.h"
#include <stdlib.h>
#include <stdio.h>

/*********************************************************************
*
*       Defines
*
**********************************************************************
*/
#define YUV_AREA_SIZE  150
#define MSG_NEW_COLORS (WM_USER + 1)
#define REFRESH_PERIOD 3000

/*********************************************************************
*
*       Static data
*
**********************************************************************
*/
/*********************************************************************
*
*       _aColor
*/
static GUI_COLOR _aColor[] = {
  GUI_BLUE,
  GUI_GREEN,
  GUI_RED,
  GUI_CYAN,
  GUI_MAGENTA,
  GUI_YELLOW,
  GUI_LIGHTBLUE,
  GUI_LIGHTGREEN,
  GUI_LIGHTRED,
  GUI_LIGHTCYAN,
  GUI_LIGHTMAGENTA,
  GUI_LIGHTYELLOW,
  GUI_DARKBLUE,
  GUI_DARKGREEN,
  GUI_DARKRED,
  GUI_DARKCYAN,
  GUI_DARKMAGENTA,
  GUI_DARKYELLOW,
  GUI_WHITE,
  GUI_LIGHTGRAY,
  GUI_GRAY,
  GUI_DARKGRAY,
  GUI_BLACK,
  GUI_BROWN,
  GUI_ORANGE,
};

/*********************************************************************
*
*       Static code
*
**********************************************************************
*/
/*********************************************************************
*
*       _cbYUV
*/
static void _cbYUV(WM_MESSAGE * pMsg) {
  GUI_RECT   Rect;
  static int r[2];

  switch (pMsg->MsgId) {
  case WM_PAINT:
    //
    // Fill window with random pixels
    //
    WM_GetClientRect(&Rect);
    GUI_DrawGradientVEx(&Rect, _aColor[r[0]], _aColor[r[1]]);
    //
    // Mark window area
    //
    GUI_SetColor(GUI_BLACK);
    GUI_DrawRectEx(&Rect);
    break;
#ifdef WIN32
  case WM_MOUSEOVER:
    WM_SendToParent(pMsg->hWin, pMsg);
    break;
#endif
  case MSG_NEW_COLORS:
    srand(GUI_GetTime());
    do {
      r[0] = rand() % GUI_COUNTOF(_aColor);
      r[1] = rand() % GUI_COUNTOF(_aColor);
    } while (r[0] == r[1]);
    WM_InvalidateWindow(WM_HBKWIN);
    WM_InvalidateWindow(pMsg->hWin);
    break;
  default:
    WM_DefaultProc(pMsg);
  }
}

/*********************************************************************
*
*       _cbBk
*/
static void _cbBk(WM_MESSAGE * pMsg) {
  static WM_HWIN  hWin;
  char            acBuffer[64];
  GUI_PID_STATE * pState;
  static int      x, y;
  U32           * pData;
  U32             Size;
  U32             v;
  int             Offset;
  U8              ColorY, ColorU, ColorV;

  switch(pMsg->MsgId) {
  case WM_SET_CALLBACK:
    //
    // Create child window to display random pixels for YUV data.
    //
    hWin = WM_CreateWindowAsChild(10, 10, YUV_AREA_SIZE, YUV_AREA_SIZE, pMsg->hWin, WM_CF_SHOW, _cbYUV, 0);
    break;
  case WM_PAINT:
    GUI_SetBkColor(GUI_WHITE);
    GUI_Clear();
    //
    // Display data.
    //
    GUI_SetFont(&GUI_Font24B_1);
    GUI_SetColor(GUI_BLACK);
    GUI_DispStringAt("emWin YUV device sample", 170, 10);
    GUI_SetFont(&GUI_Font16_1);
    sprintf(acBuffer, "Selected pixel: (%d | %d)", x, y);
    GUI_DispStringAt(acBuffer, 170, 40);
    //
    // Get YUV data and process the data.
    //
    pData = GUI_YUV_GetpData(&Size);
    if (pData) {
      //
      // Calculate position in the array.
      //
      Offset  = y * (LCD_GetXSize() / 2);
      Offset += x / 2;
      //
      // Process value.
      // The value is comprised of the following:
      // 0xVVY2UUY1
      //   | | | |
      //   | | | +-- 1st byte: Y value of 1st pixel.
      //   | | +---- 2nd byte: U value of 1st and 2nd pixel.
      //   | +------ 3rd byte: Y value of 2nd pixel.
      //   +-------- 4th byte: V value of 1st and 2nd pixel.
      //
      v = *(pData + Offset);
      ColorY = (x % 2 == 0) ? v : v >> 16;
      ColorU = v >> 8;
      ColorV = v >> 24;
    }
    GUI_SetFont(&GUI_Font16B_1);
    GUI_DispStringAt("Y:", 170, 60);
    GUI_DispStringAt("U:", 170, 80);
    GUI_DispStringAt("V:", 170, 100);
    sprintf(acBuffer, "%d", ColorY);
    GUI_DispStringAt(acBuffer, 185, 60);
    sprintf(acBuffer, "%d", ColorU);
    GUI_DispStringAt(acBuffer, 185, 80);
    sprintf(acBuffer, "%d", ColorV);
    GUI_DispStringAt(acBuffer, 185, 100);
    sprintf(acBuffer, "(0x%X)", ColorY);
    GUI_DispStringAt(acBuffer, 210, 60);
    sprintf(acBuffer, "(0x%X)", ColorU);
    GUI_DispStringAt(acBuffer, 210, 80);
    sprintf(acBuffer, "(0x%X)", ColorV);
    GUI_DispStringAt(acBuffer, 210, 100);
    break;
#ifndef WIN32
  case WM_TOUCH_CHILD:
    pState = (GUI_PID_STATE *)((WM_MESSAGE *)pMsg->Data.p)->Data.p;
    x = pState->x;
    y = pState->y;
    WM_InvalidateWindow(pMsg->hWin);
    break;
  case WM_TOUCH:
#else
  case WM_MOUSEOVER:
#endif
    pState = (GUI_PID_STATE *)pMsg->Data.p;
    x = pState->x;
    y = pState->y;
    WM_InvalidateWindow(pMsg->hWin);
    break;
  case MSG_NEW_COLORS:
    WM_SendMessageNoPara(hWin, MSG_NEW_COLORS);
    break;
  default:
    WM_DefaultProc(pMsg);
  }
}

/*********************************************************************
*
*       Public code
*
**********************************************************************
*/
/*********************************************************************
*
*       MainTask
*/
void MainTask(void) {
  //
  // Init emWin.
  //
  GUI_Init();
  WM_MULTIBUF_Enable(1);
  //
  // Create YUV device.
  //
  GUI_YUV_Create();
  GUI_YUV_SetPeriod(2800);
  //
  // Set callback to background window.
  //
  WM_SetCallback(WM_HBKWIN, _cbBk);
#ifndef WIN32
  GUI_CURSOR_Show();
#endif

  while(1) {
    WM_SendMessageNoPara(WM_HBKWIN, MSG_NEW_COLORS);
    GUI_Delay(3000);
  }
}

/*************************** End of file ****************************/