LCDAA.c
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上传日期:2017-08-10
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- /*********************************************************************
- * SEGGER MICROCONTROLLER SYSTEME GmbH *
- * Solutions for real time microcontroller applications *
- **********************************************************************
- * *
- * (c) 2002 SEGGER Microcontroller Systeme GmbH *
- * *
- * Internet: www.segger.com Support: support@segger.com *
- * *
- **********************************************************************
- **** emWin/GSC Grafical 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 : LCDAA.c
- Purpose : Low level antialiasing routines.
- ---------------------------END-OF-HEADER------------------------------
- */
- #define LCD_C
- #include <stddef.h> /* needed for definition of NULL */
- #include "LCD.H"
- #include "GUI_Private.H"
- #include "LCD_Private.h"
- /*
- *********************************************************
- * *
- * Macros for internal use *
- * *
- *********************************************************
- */
- #define RETURN_IF_Y_OUT()
- if (y < GUI_Context.ClipRect.y0)
- return;
- if (y > GUI_Context.ClipRect.y1)
- return;
- #define RETURN_IF_X_OUT()
- if (x < GUI_Context.ClipRect.x0) return;
- if (x > GUI_Context.ClipRect.x1) return;
- #define CLIP_X()
- if (x0 < GUI_Context.ClipRect.x0) { x0 = GUI_Context.ClipRect.x0; }
- if (x1 > GUI_Context.ClipRect.x1) { x1 = GUI_Context.ClipRect.x1; }
- #define CLIP_Y()
- if (y0 < GUI_Context.ClipRect.y0) { y0 = GUI_Context.ClipRect.y0; }
- if (y1 > GUI_Context.ClipRect.y1) { y1 = GUI_Context.ClipRect.y1; }
- /*
- *********************************************************
- * *
- * Antialiasing (opt) *
- * *
- *********************************************************
- */
- LCD_COLOR LCD_AA_MixColors(LCD_COLOR Color, LCD_COLOR BkColor, U8 Intens) {
- /* Calc Color seperations for FgColor first */
- I32 R = (Color&0xff)*Intens;
- I32 G = (Color&0xff00)*Intens;
- I32 B = (Color&0xff0000)*Intens;
- /* Add Color seperations for BkColor */
- Intens = 15-Intens;
- R += (BkColor&0xff)*Intens;
- G += (BkColor&0xff00)*Intens;
- B += (BkColor&0xff0000)*Intens;
- R = (R/15)&0xff;
- G = (G/15)&0xff00;
- B = (B/15)&0xff0000;
- Color = R+G+B;
- return Color;
- }
- /* Draw 1-pixel with Foreground color */
- void LCD_SetPixelAA(int x, int y, U8 Intens) {
- if (Intens == 0)
- return;
- RETURN_IF_Y_OUT();
- RETURN_IF_X_OUT();
- if (Intens >= 15) {
- LCDDEV_L0_SetPixelIndex(x,y, LCD_COLORINDEX);
- } else {
- LCD_COLOR Color = LCD_Index2Color(LCD_COLORINDEX);
- LCD_COLOR BkColor = LCD_GetPixelColor(x,y);
- Color = LCD_AA_MixColors(Color, BkColor, Intens);
- LCDDEV_L0_SetPixelIndex(x,y, LCD_Color2Index(Color));
- }
- }
- /* Draw 1-pixel with Foreground and background color */
- void LCD_SetPixelAA_NoTrans(int x, int y, U8 Intens) {
- RETURN_IF_Y_OUT();
- RETURN_IF_X_OUT();
- if (Intens == 0) {
- LCDDEV_L0_SetPixelIndex(x,y, LCD_BKCOLORINDEX);
- } else if (Intens == 15) {
- LCDDEV_L0_SetPixelIndex(x,y, LCD_COLORINDEX);
- } else {
- LCD_COLOR Color = LCD_AA_MixColors(LCD_Index2Color(LCD_COLORINDEX),
- LCD_Index2Color(LCD_BKCOLORINDEX),
- Intens);
- LCDDEV_L0_SetPixelIndex(x,y,LCD_Color2Index(Color));
- }
- }