/*************************************************************************************************************
                                                   uC/GUI
                                               嵌入式通用圖形軟件
File        : LCDRLE8.c
Purpose     : Drawing routines for run length encoded bitmaps with 8 bpp
*************************************************************************************************************/
#include <stddef.h>           /* needed for definition of NULL */
#include "GUI_Private.H"
#include "LCD_Private.H"

static struct 
{
  int x,y;
  const U8* pPixel;
  const U8* pPixelStart;
} Cache;

void LCD_DrawBitmap_RLE8 (int x0,int y0,int xsize, int ysize, const U8*pPixel, const LCD_LOGPALETTE* pLogPal, int xMag, int yMag) 
{
  LCD_PIXELINDEX aColorIndex[2];
  LCD_PIXELINDEX PixelIndex;
  int xi,y;
  int xL, yL;
  const U8* pPixelOrg = pPixel;
  char NoTrans = !(GUI_Context.DrawMode & LCD_DRAWMODE_TRANS);
  const LCD_PIXELINDEX* pTrans =NULL;
  char IsMagnified = ((yMag | xMag) != 1);
  aColorIndex[0] = LCD_ACOLORINDEX[0];
  aColorIndex[1] = LCD_ACOLORINDEX[1];
  /* Handle color translation */
  if ((pLogPal) && (pLogPal->pPalEntries)) {
    if ((pTrans = LCD_GetpPalConvTable(pLogPal)) == NULL) {
      return;
    }
  }
 /* Check if we can limit the number of lines due to clipping) */
  if (yMag == 1) {
    if (ysize > GUI_Context.ClipRect.y1 - y0 + 1)
      ysize = GUI_Context.ClipRect.y1 - y0 + 1;
  }
  /* Init variables for looping */
  xi=0;
  y =0;
  /* Check if we can use the cache to save some unnecessary iterations */
  if (!IsMagnified) {
    int yDiff = GUI_Context.ClipRect.y0 - y0;
    if ((Cache.pPixelStart == pPixel) && (yDiff > Cache.y)) {
      /* Accept cache values */
      y = Cache.y;
      xi = Cache.x;
      pPixel = Cache.pPixel;
    }
  }
  /* Init values for caching */
  Cache.pPixel = Cache.pPixelStart = pPixelOrg;
  Cache.x = Cache.y = 0;
  /* Repeat until we have reached bottom */
  for (; y < ysize; ) {
    U8 Cmd  = *pPixel++;
    U8 Data = *pPixel++;
    if (Cmd) {
      /* Save cache info */
      Cache.pPixel = pPixel-2;
      Cache.x = xi;
      Cache.y = y;
      LCD_ACOLORINDEX[1] = pTrans ? *(pTrans+Data) : Data;
      while (Cmd) {
        int xi1 = xi+Cmd;
        if (xi1>=xsize)
          xi1 = xsize;
        Cmd -= (xi1-xi);
        if (Data || NoTrans) {  /* Skip transparent pixels */
          if (IsMagnified) {
            xL = xMag * xi + x0;
            yL = yMag * y + y0;
            LCD_FillRect(xL, yL, xL + xMag * (xi1 - xi) -1 , yL + yMag - 1);
          } else {
            LCD_DrawHLine(x0+xi, y + y0, xi1+x0-1);
          }
        }
        xi =xi1;
        if (xi1==xsize) {
          y++;
          xi=0;
        }
      }
    } else {
      do {
        U8 Index = *pPixel++;
        if (Index || NoTrans) {  /* Skip transparent pixels */
          int x = x0+xi;
          PixelIndex = pTrans ? *(pTrans+Index) : Index;
          if (IsMagnified) {
            LCD_SetColorIndex(PixelIndex);
            xL = xMag * xi + x0;
            yL = yMag * y + y0;
            LCD_FillRect(xL, yL, xL + xMag -1 , yL + yMag - 1);
          } else {
            #if 1 /* High speed variant */
              if (y + y0>= GUI_Context.ClipRect.y0)
                if (x >= GUI_Context.ClipRect.x0)
                  if (x <= GUI_Context.ClipRect.x1)
                    LCDDEV_L0_SetPixelIndex(x, y + y0, PixelIndex);
            #else
              LCD_SetPixelIndex(x, y + y0, PixelIndex);
            #endif
          }
        }
        if (++xi >= xsize) {
          xi=0; y++;
          if (y >= ysize)
            break;
        }
      } while (--Data);
    }
  }
  LCD_ACOLORINDEX[0] = aColorIndex[0];
  LCD_ACOLORINDEX[1] = aColorIndex[1];
}