gui__drawbitmap16bpp.c

ucgui的3.98版本的源代码

/*
*********************************************************************************************************
*                                             uC/GUI V3.98
*                        Universal graphic software for embedded applications
*
*                       (c) Copyright 2002, Micrium Inc., Weston, FL
*                       (c) Copyright 2002, SEGGER Microcontroller Systeme GmbH
*
*              礐/GUI 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 redistributed
*              in any way. We appreciate your understanding and fairness.
*
----------------------------------------------------------------------
File        : GUI__DrawBitmap16bpp.c
Purpose     : Implementation of GUI__DrawBitmap16bpp
---------------------------END-OF-HEADER------------------------------
*/

#include <stddef.h>           /* needed for definition of NULL */
#include "GUI_Private.h"

/*********************************************************************
*
*       Private code
*
**********************************************************************
*/
/*********************************************************************
*
*       GUI__DrawBitmap16bpp
*/
void GUI__DrawBitmap16bpp(int x0, int y0, int xsize, int ysize, const U8 GUI_UNI_PTR * pPixel, const LCD_LOGPALETTE GUI_UNI_PTR * pLogPal, int xMag, int yMag, tLCDDEV_Index2Color * pfIndex2Color) {
  const U16 * pData;
  int y, OldIndex, PrevIndex, Mag, BytesPerLine, UseDrawBitmap = 0;
  GUI_USE_PARA(pLogPal);
  OldIndex = LCD_GetColorIndex();
  PrevIndex = OldIndex;
  pData = (const U16 *)pPixel;
  Mag = (xMag | yMag);
  BytesPerLine = xsize * 2;
  /* Check if bitmaps color format fits to the current color conversion */
  if (Mag == 1) {
    tLCDDEV_Index2Color * pfIndex2ColorCompare = NULL;
    #if GUI_SUPPORT_MEMDEV
    if (GUI_Context.hDevData) {
      /* If a memory device is selected, use the color conversion routine of the memory device */
      GUI_MEMDEV * pDevData;
      pDevData = GUI_MEMDEV_H2P(GUI_Context.hDevData);
      pfIndex2ColorCompare = pDevData->pfIndex2Color;
    } else {
    #else
    {
    #endif
      /* If no memory device is selected, use the color conversion routine of the current layer */
      pfIndex2ColorCompare = LCD_GetpfIndex2ColorEx(GUI_Context.SelLayer);
    }
    /* Check if color conversion routine fits  */
    if (pfIndex2ColorCompare == pfIndex2Color) {
      UseDrawBitmap = 1;
    }
  }
  if (UseDrawBitmap) {
    LCD_DrawBitmap(x0, y0, xsize, ysize, 1, 1, 16, BytesPerLine, pPixel, 0);
  } else {
    if (Mag == 1) {
      /* Perform clipping */
      int x1, y1, Diff;
      y1 = y0 + ysize - 1;
      x1 = x0 + xsize - 1;
      /* Clip Y */
      if (y0 < GUI_Context.ClipRect.y0) {
        Diff = GUI_Context.ClipRect.y0 -y0;
        y0   = GUI_Context.ClipRect.y0;
        #if GUI_SUPPORT_LARGE_BITMAPS                       /* Required only for 16 bit CPUs if some bitmaps are >64kByte */
          pData += (U32)Diff * (U32)BytesPerLine / 2;
        #else
          pData += (unsigned)Diff * (unsigned)BytesPerLine / 2;
        #endif
        ysize -= Diff;
      }
      Diff = y1 - GUI_Context.ClipRect.y1;
      if (Diff > 0) {
        ysize -= Diff;
      }
      if (ysize <=0) {
		    return;
      }
      /* Clip right side */
      Diff = x1 - GUI_Context.ClipRect.x1;
      if (Diff > 0) {
        xsize -= Diff;
      }
      /* Clip left side */
      if (x0 < GUI_Context.ClipRect.x0) {
        Diff = GUI_Context.ClipRect.x0-x0;
			  xsize -= Diff;
        pData += Diff; 
        x0 += Diff; 
      }
      if (xsize <=0) {
		    return;
      }
      /* Simple, unmagnified output using LCD_L0_SetPixel() */
      for (y = 0; y < ysize; y++) {
        int x;
        const U16 * p = pData;
        for (x = 0; x < xsize; x++) {
          U16 Index;
          Index = *p++;
          if (Index != PrevIndex) {
            LCD_SetColor(pfIndex2Color(Index));
            PrevIndex = Index;
          }
          LCDDEV_L0_SetPixelIndex(x + x0, y + y0, LCD_COLORINDEX);
        }
        pData += BytesPerLine / 2;
      }
    } else {
      /* Magnified output using LCD_FillRect() */
      int x,y;
      int yi;
      for (y = y0, yi = 0; yi < ysize; yi++, y += yMag, pPixel += BytesPerLine) {
        int yMax;
        yMax = y + yMag - 1;
        /* Draw if within clip area */
        if ((yMax >= GUI_Context.ClipRect.y0) && (y <= GUI_Context.ClipRect.y1)) {
          int xi;
          const U16 GUI_UNI_PTR * p = pData;
          for (x = x0, xi = 0; xi < xsize; xi++, x += xMag) {
            U16 Index;
            Index = *p++;
            if (Index != PrevIndex) {
              LCD_SetColor(pfIndex2Color(Index));
              PrevIndex = Index;
            }
            LCD_FillRect(x, y, x + xMag - 1, yMax);
          }
        }
        pData += BytesPerLine / 2;
      }
    }
    GUI_SetColorIndex(OldIndex);
  }
}

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