GFXFb.cpp

00001 /*
00002  *  Copyright 2013 Embedded Artists AB
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 /******************************************************************************
00018  * Includes
00019  *****************************************************************************/
00020 
00021 #include "mbed.h"
00022 #include "GFXFb.h"
00023 
00024 
00025 GFXFb::GFXFb(uint16_t w, uint16_t h, uint16_t* fb) : Adafruit_GFX(w, h) {
00026     _fb = fb;
00027 }
00028 
00029 
00030 void GFXFb::drawPixel(int16_t x, int16_t y, uint16_t color) {
00031     if (_fb == 0) return;
00032 
00033     if (x < 0 || x >= width() || y < 0 || y >= height()) return;
00034 
00035     *(_fb + x + y*_width ) = color;
00036 }
00037 
00038 void GFXFb::drawFastVLine(int16_t x, int16_t y, int16_t h, uint16_t color) {
00039     int16_t y2 = y + h - 1;
00040 
00041     if (y < 0) y = 0;
00042     if (y2 >= _height) y2 = _height-1;
00043 
00044     if (_fb == 0) return;
00045     if (x < 0 || x >= _width || y >= _height || y2 < y) return;
00046 
00047     uint16_t* f = (_fb + x + y*_width);
00048     while(y <= y2) {
00049 
00050         *f = color;
00051         f += _width;
00052         y++;
00053     }
00054 
00055 }
00056 
00057 void GFXFb::drawFastHLine(int16_t x, int16_t y, int16_t w, uint16_t color) {
00058     int16_t x2 = x + w - 1;
00059 
00060     if (x < 0) x = 0;
00061     if (x2 >= _width) x2 = _width-1;
00062 
00063     if (_fb == 0) return;
00064     if (x >= _width || x2 < x || y < 0 || y >= _height) return;
00065 
00066     uint16_t* f = (_fb + x + y*_width);
00067     while(x <= x2) {
00068 
00069         *f++ = color;
00070         x++;
00071     }
00072 
00073 }
00074 
00075 
00076 void GFXFb::fillScreen(uint16_t color) {
00077 
00078     if (_fb == 0) return;
00079 
00080     int len = _width*_height;
00081     for (int i = 0; i < len; i++) {
00082         *(_fb+i) = color;
00083     }
00084 }
00085 
00086 void GFXFb::writeString(const char* s) {
00087     if (s == NULL) return;
00088 
00089     while(*s != 0) {
00090         write(*s);
00091         s++;
00092     }
00093 }
00094 
00095 int16_t GFXFb::getStringWidth(const char* s) {
00096     // the default font in GFX is 6 pixels in width
00097     int chWidth = 6*textsize;
00098     int sz = 0;
00099 
00100     while(*s != 0) {
00101         sz += chWidth;
00102         s++;
00103     }
00104 
00105     return sz;
00106 }
00107 
00108 int16_t GFXFb::getStringHeight(const char* s) {
00109     (void)s;
00110     // the default font in GFX is 8 pixels in height
00111     return 8;
00112 }
00113 
00114