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83 lines
2.4 KiB
C++
83 lines
2.4 KiB
C++
// class GxEPD : Base Class for Display Classes for e-Paper Displays from Dalian Good Display Co., Ltd.: www.good-display.com
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//
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// based on Demo Examples from Good Display, available here: http://www.good-display.com/download_list/downloadcategoryid=34&isMode=false.html
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//
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// Author : J-M Zingg
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//
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// Version : see library.properties
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//
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// License: GNU GENERAL PUBLIC LICENSE V3, see LICENSE
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//
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// Library: https://github.com/ZinggJM/GxEPD
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#include "GxEPD.h"
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#if defined(ESP8266) || defined(ESP32)
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#include <pgmspace.h>
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#else
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#include <avr/pgmspace.h>
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#endif
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void GxEPD::drawBitmapBM(const uint8_t *bitmap, uint16_t x, uint16_t y, uint16_t w, uint16_t h, uint16_t color, int16_t mode)
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{
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uint16_t inverse_color = (color != GxEPD_WHITE) ? GxEPD_WHITE : GxEPD_BLACK;
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uint16_t fg_color = (mode & bm_invert) ? inverse_color : color;
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uint16_t bg_color = (mode & bm_invert) ? color : inverse_color;
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// taken from Adafruit_GFX.cpp, modified
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int16_t byteWidth = (w + 7) / 8; // Bitmap scanline pad = whole byte
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uint8_t byte = 0;
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if (mode & bm_transparent)
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{
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for (uint16_t j = 0; j < h; j++)
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{
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for (uint16_t i = 0; i < w; i++ )
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{
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if (i & 7) byte <<= 1;
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else
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{
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#if defined(__AVR) || defined(ESP8266) || defined(ESP32)
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byte = pgm_read_byte(&bitmap[j * byteWidth + i / 8]);
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#else
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byte = bitmap[j * byteWidth + i / 8];
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#endif
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}
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// transparent mode
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if (bool(mode & bm_invert) != bool(byte & 0x80))
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//if (!(byte & 0x80))
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{
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uint16_t xd = x + i;
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uint16_t yd = y + j;
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if (mode & bm_flip_x) xd = x + w - i;
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if (mode & bm_flip_y) yd = y + h - j;
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drawPixel(xd, yd, color);
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}
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}
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}
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}
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else
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{
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for (uint16_t j = 0; j < h; j++)
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{
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for (uint16_t i = 0; i < w; i++ )
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{
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if (i & 7) byte <<= 1;
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else
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{
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#if defined(__AVR) || defined(ESP8266) || defined(ESP32)
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byte = pgm_read_byte(&bitmap[j * byteWidth + i / 8]);
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#else
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byte = bitmap[j * byteWidth + i / 8];
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#endif
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}
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// keep using overwrite mode
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uint16_t pixelcolor = (byte & 0x80) ? fg_color : bg_color;
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uint16_t xd = x + i;
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uint16_t yd = y + j;
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if (mode & bm_flip_x) xd = x + w - i;
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if (mode & bm_flip_y) yd = y + h - j;
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drawPixel(xd, yd, pixelcolor);
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}
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}
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}
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}
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