65 lines
2.2 KiB
C
65 lines
2.2 KiB
C
/*
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*********************************************************************************************************
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* uC/GUI
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* Universal graphic software for embedded applications
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*
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* (c) Copyright 2002, Micrium Inc., Weston, FL
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* (c) Copyright 2002, SEGGER Microcontroller Systeme GmbH
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*
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* µC/GUI is protected by international copyright laws. Knowledge of the
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* source code may not be used to write a similar product. This file may
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* only be used in accordance with a license and should not be redistributed
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* in any way. We appreciate your understanding and fairness.
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*
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----------------------------------------------------------------------
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File : GUI_GetBitmapPixelIndex.c
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Purpose : Implementation of GUI_GetBitmapPixelIndex
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---------------------------END-OF-HEADER------------------------------
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*/
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#include "GUI_Private.h"
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/*********************************************************************
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*
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* Public code
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*
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**********************************************************************
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*/
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/*********************************************************************
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*
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* GUI_GetBitmapPixelIndex
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*/
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int GUI_GetBitmapPixelIndex(const GUI_BITMAP GUI_UNI_PTR * pBMP, unsigned x, unsigned y) {
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unsigned Off, Value;
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switch (pBMP->BitsPerPixel) {
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case 1:
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Off = (x >> 3) + (y * pBMP->BytesPerLine);
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Value = *(pBMP->pData + Off);
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Value = Value >> (7 - (x & 0x7)) & 0x1;
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break;
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case 2:
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Off = (x >> 2) + (y * pBMP->BytesPerLine);
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Value = *(pBMP->pData + Off);
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Value = Value >> (6 - ((x << 1) & 0x6)) & 0x3;
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break;
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case 4:
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Off = (x >> 1) + (y * pBMP->BytesPerLine);
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Value = *(pBMP->pData + Off);
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Value = (x & 1) ? (Value & 0xF) : (Value >> 4);
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break;
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case 8:
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Off = x + y * pBMP->BytesPerLine;
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Value = *(pBMP->pData + Off);
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break;
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case 16:
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Off = (x << 1) + y * pBMP->BytesPerLine;
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Value = *(pBMP->pData + Off) | (*(pBMP->pData + Off + 1) << 8);
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break;
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default:
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Value = 0;
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}
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return Value;
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}
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/*************************** End of file ****************************/
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