BitmapImage.cpp

00001 /* NeatGUI Library
00002  * Copyright (c) 2013 Neil Thiessen
00003  *
00004  * Licensed under the Apache License, Version 2.0 (the "License");
00005  * you may not use this file except in compliance with the License.
00006  * You may obtain a copy of the License at
00007  *
00008  *     http://www.apache.org/licenses/LICENSE-2.0
00009  *
00010  * Unless required by applicable law or agreed to in writing, software
00011  * distributed under the License is distributed on an "AS IS" BASIS,
00012  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00013  * See the License for the specific language governing permissions and
00014  * limitations under the License.
00015  */
00016 
00017 #include "BitmapImage.h"
00018 
00019 BitmapImage::BitmapImage(const char* table) : Image(table[0] * 0xFF + table[1], table[2] * 0xFF + table[3])
00020 {
00021     m_ImageTable = table;
00022     m_FgColor = 0xFFFFFFFF;
00023     m_BgColor = 0x00000000;
00024 }
00025 
00026 BitmapImage::BitmapImage(const char* table, unsigned int fg_color) : Image(table[0] * 0xFF + table[1], table[2] * 0xFF + table[3])
00027 {
00028     m_ImageTable = table;
00029     m_FgColor = fg_color;
00030     m_BgColor = 0x00000000;
00031 }
00032 
00033 BitmapImage::BitmapImage(const char* table, unsigned int fg_color, unsigned int bg_color) : Image(table[0] * 0xFF + table[1], table[2] * 0xFF + table[3])
00034 {
00035     m_ImageTable = table;
00036     m_FgColor = fg_color;
00037     m_BgColor = bg_color;
00038 }
00039 
00040 unsigned int BitmapImage::pixel(int x, int y)
00041 {
00042     int addr;
00043     int mask;
00044     int bpl;
00045 
00046     //Range check the pixel request
00047     if ((x < 0) || (y < 0) || (x >= width()) || (y >= height())) return 0x000000;
00048 
00049     //Get the pixel address
00050     bpl = bytesPerLine();
00051     mask = 0x80 >> (x % 8);
00052     addr = 4 + y * bpl + (x / 8);
00053 
00054     //Return the appropriate color
00055     if (m_ImageTable[addr] & mask)
00056         return m_FgColor;
00057     else
00058         return m_BgColor;
00059 }
00060 
00061 unsigned int BitmapImage::foreground()
00062 {
00063     return m_FgColor;
00064 }
00065 
00066 void BitmapImage::foreground(unsigned int c)
00067 {
00068     m_FgColor = c;
00069 }
00070 
00071 unsigned int BitmapImage::background()
00072 {
00073     return m_BgColor;
00074 }
00075 
00076 void BitmapImage::background(unsigned int c)
00077 {
00078     m_BgColor = c;
00079 }
00080 
00081 int BitmapImage::bytesPerLine()
00082 {
00083     int bpl;
00084 
00085     //Determine the bytes per line
00086     bpl = width() / 8;
00087     if ((width() % 8) != 0) bpl++;
00088 
00089     //Return the bytes per line
00090     return bpl;
00091 }