MHVLib  20111011
An efficiency oriented runtime library for AVR microcontrollers
A:/eclipse/mhvlib/MHV_Display_Monochrome_Buffered.cpp
Go to the documentation of this file.
00001 /* Copyright (c) 2011, Make, Hack, Void Inc
00002  * All rights reserved.
00003  *
00004  * Redistribution and use in source and binary forms, with or without
00005  * modification, are permitted provided that the following conditions are met:
00006  *  * Redistributions of source code must retain the above copyright
00007  *    notice, this list of conditions and the following disclaimer.
00008  *  * Redistributions in binary form must reproduce the above copyright
00009  *    notice, this list of conditions and the following disclaimer in the
00010  *    documentation and/or other materials provided with the distribution.
00011  *  * Neither the name of the Make, Hack, Void nor the
00012  *    names of its contributors may be used to endorse or promote products
00013  *    derived from this software without specific prior written permission.
00014  *
00015  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
00016  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
00017  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
00018  * DISCLAIMED. IN NO EVENT SHALL MAKE, HACK, VOID BE LIABLE FOR ANY
00019  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
00020  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
00021  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
00022  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
00023  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
00024  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00025  */
00026 
00027 #include "MHV_Display_Monochrome_Buffered.h"
00028 #include <string.h>
00029 #include <math.h>
00030 
00031 #define pixel(pixelRow, pixelCol) _frameBuffer[pixelRow * _colCount + pixelCol]
00032 
00039 MHV_Display_Monochrome_Buffered::MHV_Display_Monochrome_Buffered(
00040                 uint16_t colCount, uint16_t rowCount,
00041                 uint8_t *frameBuffer, MHV_RingBuffer *txBuffers) :
00042                         MHV_Display_Monochrome(rowCount, colCount, txBuffers) {
00043         _frameBuffer = frameBuffer;
00044         memset(_frameBuffer, 0, rowCount * colCount);
00045 }
00046 
00047 /* Set a pixel
00048  * param:       col             the column
00049  * param:       row             the row
00050  * param:       value   the intensity of the pixel
00051  */
00052 void MHV_Display_Monochrome_Buffered::setPixel(uint16_t col, uint16_t row, uint8_t value) {
00053         if (row < _rowCount && col < _colCount) {
00054                 pixel(row, col) = value;
00055         }
00056 }
00057 
00058 /* Get a pixel
00059  * param:       col             the column
00060  * param:       row             the row
00061  * return       the intensity of the pixel
00062  */
00063 uint8_t MHV_Display_Monochrome_Buffered::getPixel(uint16_t col, uint16_t row) {
00064         if (row < _rowCount && col < _colCount) {
00065                 return pixel(row, col);
00066         } else {
00067                 return 0;
00068         }
00069 }