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jcalendar/lib/GxEPD2/examples/GxEPD2_Spiffs_Example/GxEPD2_Spiffs_Example.ino
Jerry bbe50b0b68 1.1.5
2025-10-07 20:23:53 +08:00

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// GxEPD2_Spiffs_Example : Display Library example for SPI e-paper panels from Dalian Good Display and boards from Waveshare.
// Requires HW SPI and Adafruit_GFX. Caution: the e-paper panels require 3.3V supply AND data lines!
//
// Display Library based on Demo Example from Good Display: https://www.good-display.com/companyfile/32/
//
// BMP handling code extracts taken from: https://github.com/prenticedavid/MCUFRIEND_kbv/tree/master/examples/showBMP_kbv_Uno
//
// Author: Jean-Marc Zingg
//
// Version: see library.properties
//
// Library: https://github.com/ZinggJM/GxEPD2
//
// note that BMP bitmaps are drawn at physical position in physical orientation of the screen
// Supporting Arduino Forum Topics (closed, read only):
// Good Display ePaper for Arduino: https://forum.arduino.cc/t/good-display-epaper-for-arduino/419657
// Waveshare e-paper displays with SPI: https://forum.arduino.cc/t/waveshare-e-paper-displays-with-spi/467865
//
// Add new topics in https://forum.arduino.cc/c/using-arduino/displays/23 for new questions and issues
// see GxEPD2_wiring_examples.h for wiring suggestions and examples
// base class GxEPD2_GFX can be used to pass references or pointers to the display instance as parameter, uses ~1.2k more code
// enable or disable GxEPD2_GFX base class
#define ENABLE_GxEPD2_GFX 0
// uncomment next line to use class GFX of library GFX_Root instead of Adafruit_GFX
//#include <GFX.h>
// Note: if you use this with ENABLE_GxEPD2_GFX 1:
// uncomment it in GxEPD2_GFX.h too, or add #include <GFX.h> before any #include <GxEPD2_GFX.h>
#include <GxEPD2_BW.h>
#include <GxEPD2_3C.h>
#include <GxEPD2_4C.h>
#include <GxEPD2_7C.h>
#include <Fonts/FreeMonoBold9pt7b.h>
#if defined(ESP32)
#include "SPIFFS.h"
#else
#include <LittleFS.h>
#endif
#include <FS.h>
#define FileClass fs::File
// select the display class and display driver class in the following file (new style):
#include "GxEPD2_display_selection_new_style.h"
// function declaration with default parameter
// note that BMP bitmaps are drawn at physical position in physical orientation of the screen
void drawBitmapFromSpiffs(const char *filename, int16_t x, int16_t y, bool with_color = true);
// bitmap drawing using buffered graphics, e.g. for small bitmaps or for GxEPD2_154c
// draws BMP bitmap according to set orientation
// partial_update selects refresh mode (not effective for GxEPD2_154c)
// overwrite = true does not clear buffer before drawing, use only if buffer is full height
void drawBitmapFromSpiffs_Buffered(const char *filename, int16_t x, int16_t y, bool with_color = true, bool partial_update = false, bool overwrite = false);
void setup()
{
Serial.begin(115200);
Serial.println();
Serial.println("GxEPD2_Spiffs_Example");
//display.init(115200); // default 10ms reset pulse, e.g. for bare panels with DESPI-C02
display.init(115200, true, 2, false); // USE THIS for Waveshare boards with "clever" reset circuit, 2ms reset pulse
#if defined(ESP32)
SPIFFS.begin();
Serial.println("SPIFFS started");
#else
LittleFS.begin();
Serial.println("LittleFS started");
#endif
listFiles();
if ((display.epd2.panel == GxEPD2::GDEW0154Z04) || (display.epd2.panel == GxEPD2::ACeP565) || (display.epd2.panel == GxEPD2::GDEY073D46) || false)
{
//drawBitmapsBuffered_200x200();
//drawBitmapsBuffered_other();
drawBitmapsBuffered_test();
}
else
{
drawBitmaps_200x200();
drawBitmaps_other();
//drawBitmaps_test();
}
Serial.println("GxEPD2_Spiffs_Example done");
}
void loop(void)
{
}
void drawBitmaps_200x200()
{
int16_t x = (display.width() - 200) / 2;
int16_t y = (display.height() - 200) / 2;
drawBitmapFromSpiffs("logo200x200.bmp", x, y);
delay(2000);
drawBitmapFromSpiffs("first200x200.bmp", x, y);
delay(2000);
drawBitmapFromSpiffs("second200x200.bmp", x, y);
delay(2000);
drawBitmapFromSpiffs("third200x200.bmp", x, y);
delay(2000);
drawBitmapFromSpiffs("fourth200x200.bmp", x, y);
delay(2000);
drawBitmapFromSpiffs("fifth200x200.bmp", x, y);
delay(2000);
drawBitmapFromSpiffs("sixth200x200.bmp", x, y);
delay(2000);
drawBitmapFromSpiffs("seventh200x200.bmp", x, y);
delay(2000);
drawBitmapFromSpiffs("eighth200x200.bmp", x, y);
delay(2000);
}
void drawBitmaps_other()
{
int16_t w2 = display.width() / 2;
int16_t h2 = display.height() / 2;
drawBitmapFromSpiffs("chanceflurries.bmp", w2 - 50, h2 - 50, false);
delay(2000);
drawBitmapFromSpiffs("betty_1.bmp", w2 - 100, h2 - 160);
delay(2000);
drawBitmapFromSpiffs("betty_4.bmp", w2 - 102, h2 - 126);
delay(2000);
drawBitmapFromSpiffs("marilyn_240x240x8.bmp", w2 - 120, h2 - 120);
delay(2000);
drawBitmapFromSpiffs("miniwoof.bmp", w2 - 60, h2 - 80);
delay(2000);
drawBitmapFromSpiffs("tiger.bmp", w2 - 160, h2 - 120);
delay(2000);
drawBitmapFromSpiffs("tiger_178x160x4.bmp", w2 - 89, h2 - 80);
delay(2000);
drawBitmapFromSpiffs("tiger_240x317x4.bmp", w2 - 120, h2 - 160);
delay(2000);
drawBitmapFromSpiffs("tiger_320x200x24.bmp", w2 - 160, h2 - 100);
delay(2000);
drawBitmapFromSpiffs("woof.bmp", w2 - 120, h2 - 160);
delay(2000);
}
void drawBitmaps_test()
{
drawBitmapFromSpiffs("output5.bmp", 0, 0);
delay(2000);
drawBitmapFromSpiffs("output6.bmp", 0, 0);
delay(2000);
drawBitmapFromSpiffs("tractor_1.bmp", 0, 0);
delay(2000);
drawBitmapFromSpiffs("tractor_4.bmp", 0, 0);
delay(2000);
//drawBitmapFromSpiffs("tractor_8.bmp", 0, 0); // format 1: BI_RLE8 is not supported
//delay(2000);
drawBitmapFromSpiffs("tractor_11.bmp", 0, 0);
delay(2000);
drawBitmapFromSpiffs("tractor_44.bmp", 0, 0);
delay(2000);
drawBitmapFromSpiffs("tractor_88.bmp", 0, 0);
delay(2000);
}
void drawBitmapsBuffered_200x200()
{
int16_t x = (display.width() - 200) / 2;
int16_t y = (display.height() - 200) / 2;
drawBitmapFromSpiffs_Buffered("logo200x200.bmp", x, y);
delay(2000);
drawBitmapFromSpiffs_Buffered("first200x200.bmp", x, y);
delay(2000);
drawBitmapFromSpiffs_Buffered("second200x200.bmp", x, y);
delay(2000);
drawBitmapFromSpiffs_Buffered("third200x200.bmp", x, y);
delay(2000);
drawBitmapFromSpiffs_Buffered("fourth200x200.bmp", x, y);
delay(2000);
drawBitmapFromSpiffs_Buffered("fifth200x200.bmp", x, y);
delay(2000);
drawBitmapFromSpiffs_Buffered("sixth200x200.bmp", x, y);
delay(2000);
drawBitmapFromSpiffs_Buffered("seventh200x200.bmp", x, y);
delay(2000);
drawBitmapFromSpiffs_Buffered("eighth200x200.bmp", x, y);
delay(2000);
}
void drawBitmapsBuffered_other()
{
int16_t w2 = display.width() / 2;
int16_t h2 = display.height() / 2;
drawBitmapFromSpiffs_Buffered("chanceflurries.bmp", w2 - 50, h2 - 50, false);
delay(2000);
drawBitmapFromSpiffs_Buffered("betty_1.bmp", w2 - 100, h2 - 160);
delay(2000);
drawBitmapFromSpiffs_Buffered("betty_4.bmp", w2 - 102, h2 - 126);
delay(2000);
drawBitmapFromSpiffs_Buffered("marilyn_240x240x8.bmp", w2 - 120, h2 - 120);
delay(2000);
drawBitmapFromSpiffs_Buffered("miniwoof.bmp", w2 - 60, h2 - 80);
delay(2000);
drawBitmapFromSpiffs_Buffered("tiger.bmp", w2 - 160, h2 - 120);
delay(2000);
drawBitmapFromSpiffs_Buffered("tiger_178x160x4.bmp", w2 - 89, h2 - 80);
delay(2000);
drawBitmapFromSpiffs_Buffered("tiger_240x317x4.bmp", w2 - 120, h2 - 160);
delay(2000);
drawBitmapFromSpiffs_Buffered("tiger_320x200x24.bmp", w2 - 160, h2 - 100);
delay(2000);
drawBitmapFromSpiffs_Buffered("woof.bmp", w2 - 120, h2 - 160);
delay(2000);
}
void drawBitmapsBuffered_test()
{
int16_t w2 = display.width() / 2;
int16_t h2 = display.height() / 2;
drawBitmapFromSpiffs_Buffered("betty_4.bmp", w2 - 102, h2 - 126);
delay(2000);
drawBitmapFromSpiffs_Buffered("bb4.bmp", 0, 0, false, true, true);
delay(2000);
drawBitmapFromSpiffs_Buffered("rgb32.bmp", 0, 0);
delay(2000);
drawBitmapFromSpiffs_Buffered("parrot.bmp", 0, 0);
delay(2000);
drawBitmapFromSpiffs_Buffered("5in65f3.bmp", 0, 0);
delay(2000);
}
static const uint16_t input_buffer_pixels = 800; // may affect performance
static const uint16_t max_row_width = 1872; // for up to 7.8" display 1872x1404
static const uint16_t max_palette_pixels = 256; // for depth <= 8
uint8_t input_buffer[3 * input_buffer_pixels]; // up to depth 24
uint8_t output_row_mono_buffer[max_row_width / 8]; // buffer for at least one row of b/w bits
uint8_t output_row_color_buffer[max_row_width / 8]; // buffer for at least one row of color bits
uint8_t mono_palette_buffer[max_palette_pixels / 8]; // palette buffer for depth <= 8 b/w
uint8_t color_palette_buffer[max_palette_pixels / 8]; // palette buffer for depth <= 8 c/w
uint16_t rgb_palette_buffer[max_palette_pixels]; // palette buffer for depth <= 8 for buffered graphics, needed for 7-color display
void drawBitmapFromSpiffs(const char *filename, int16_t x, int16_t y, bool with_color)
{
fs::File file;
bool valid = false; // valid format to be handled
bool flip = true; // bitmap is stored bottom-to-top
uint32_t startTime = millis();
if ((x >= display.epd2.WIDTH) || (y >= display.epd2.HEIGHT)) return;
Serial.println();
Serial.print("Loading image '");
Serial.print(filename);
Serial.println('\'');
#if defined(ESP32)
file = SPIFFS.open(String("/") + filename, "r");
#else
file = LittleFS.open(filename, "r");
#endif
if (!file)
{
Serial.print("File not found");
return;
}
// Parse BMP header
if (read16(file) == 0x4D42) // BMP signature
{
uint32_t fileSize = read32(file);
uint32_t creatorBytes = read32(file); (void)creatorBytes; //unused
uint32_t imageOffset = read32(file); // Start of image data
uint32_t headerSize = read32(file);
uint32_t width = read32(file);
int32_t height = (int32_t) read32(file);
uint16_t planes = read16(file);
uint16_t depth = read16(file); // bits per pixel
uint32_t format = read32(file);
if ((planes == 1) && ((format == 0) || (format == 3))) // uncompressed is handled, 565 also
{
Serial.print("File size: "); Serial.println(fileSize);
Serial.print("Image Offset: "); Serial.println(imageOffset);
Serial.print("Header size: "); Serial.println(headerSize);
Serial.print("Bit Depth: "); Serial.println(depth);
Serial.print("Image size: ");
Serial.print(width);
Serial.print('x');
Serial.println(height);
// BMP rows are padded (if needed) to 4-byte boundary
uint32_t rowSize = (width * depth / 8 + 3) & ~3;
if (depth < 8) rowSize = ((width * depth + 8 - depth) / 8 + 3) & ~3;
if (height < 0)
{
height = -height;
flip = false;
}
uint16_t w = width;
uint16_t h = height;
if ((x + w - 1) >= display.epd2.WIDTH) w = display.epd2.WIDTH - x;
if ((y + h - 1) >= display.epd2.HEIGHT) h = display.epd2.HEIGHT - y;
if (w <= max_row_width) // handle with direct drawing
{
valid = true;
uint8_t bitmask = 0xFF;
uint8_t bitshift = 8 - depth;
uint16_t red, green, blue;
bool whitish = false;
bool colored = false;
if (depth == 1) with_color = false;
if (depth <= 8)
{
if (depth < 8) bitmask >>= depth;
//file.seek(54); //palette is always @ 54
file.seek(imageOffset - (4 << depth)); // 54 for regular, diff for colorsimportant
for (uint16_t pn = 0; pn < (1 << depth); pn++)
{
blue = file.read();
green = file.read();
red = file.read();
file.read();
whitish = with_color ? ((red > 0x80) && (green > 0x80) && (blue > 0x80)) : ((red + green + blue) > 3 * 0x80); // whitish
colored = (red > 0xF0) || ((green > 0xF0) && (blue > 0xF0)); // reddish or yellowish?
if (0 == pn % 8) mono_palette_buffer[pn / 8] = 0;
mono_palette_buffer[pn / 8] |= whitish << pn % 8;
if (0 == pn % 8) color_palette_buffer[pn / 8] = 0;
color_palette_buffer[pn / 8] |= colored << pn % 8;
}
}
display.clearScreen();
uint32_t rowPosition = flip ? imageOffset + (height - h) * rowSize : imageOffset;
for (uint16_t row = 0; row < h; row++, rowPosition += rowSize) // for each line
{
uint32_t in_remain = rowSize;
uint32_t in_idx = 0;
uint32_t in_bytes = 0;
uint8_t in_byte = 0; // for depth <= 8
uint8_t in_bits = 0; // for depth <= 8
uint8_t out_byte = 0xFF; // white (for w%8!=0 border)
uint8_t out_color_byte = 0xFF; // white (for w%8!=0 border)
uint32_t out_idx = 0;
file.seek(rowPosition);
for (uint16_t col = 0; col < w; col++) // for each pixel
{
// Time to read more pixel data?
if (in_idx >= in_bytes) // ok, exact match for 24bit also (size IS multiple of 3)
{
in_bytes = file.read(input_buffer, in_remain > sizeof(input_buffer) ? sizeof(input_buffer) : in_remain);
in_remain -= in_bytes;
in_idx = 0;
}
switch (depth)
{
case 32:
blue = input_buffer[in_idx++];
green = input_buffer[in_idx++];
red = input_buffer[in_idx++];
in_idx++; // skip alpha
whitish = with_color ? ((red > 0x80) && (green > 0x80) && (blue > 0x80)) : ((red + green + blue) > 3 * 0x80); // whitish
colored = (red > 0xF0) || ((green > 0xF0) && (blue > 0xF0)); // reddish or yellowish?
break;
case 24:
blue = input_buffer[in_idx++];
green = input_buffer[in_idx++];
red = input_buffer[in_idx++];
whitish = with_color ? ((red > 0x80) && (green > 0x80) && (blue > 0x80)) : ((red + green + blue) > 3 * 0x80); // whitish
colored = (red > 0xF0) || ((green > 0xF0) && (blue > 0xF0)); // reddish or yellowish?
break;
case 16:
{
uint8_t lsb = input_buffer[in_idx++];
uint8_t msb = input_buffer[in_idx++];
if (format == 0) // 555
{
blue = (lsb & 0x1F) << 3;
green = ((msb & 0x03) << 6) | ((lsb & 0xE0) >> 2);
red = (msb & 0x7C) << 1;
}
else // 565
{
blue = (lsb & 0x1F) << 3;
green = ((msb & 0x07) << 5) | ((lsb & 0xE0) >> 3);
red = (msb & 0xF8);
}
whitish = with_color ? ((red > 0x80) && (green > 0x80) && (blue > 0x80)) : ((red + green + blue) > 3 * 0x80); // whitish
colored = (red > 0xF0) || ((green > 0xF0) && (blue > 0xF0)); // reddish or yellowish?
}
break;
case 1:
case 2:
case 4:
case 8:
{
if (0 == in_bits)
{
in_byte = input_buffer[in_idx++];
in_bits = 8;
}
uint16_t pn = (in_byte >> bitshift) & bitmask;
whitish = mono_palette_buffer[pn / 8] & (0x1 << pn % 8);
colored = color_palette_buffer[pn / 8] & (0x1 << pn % 8);
in_byte <<= depth;
in_bits -= depth;
}
break;
}
if (whitish)
{
// keep white
}
else if (colored && with_color)
{
out_color_byte &= ~(0x80 >> col % 8); // colored
}
else
{
out_byte &= ~(0x80 >> col % 8); // black
}
if ((7 == col % 8) || (col == w - 1)) // write that last byte! (for w%8!=0 border)
{
output_row_color_buffer[out_idx] = out_color_byte;
output_row_mono_buffer[out_idx++] = out_byte;
out_byte = 0xFF; // white (for w%8!=0 border)
out_color_byte = 0xFF; // white (for w%8!=0 border)
}
} // end pixel
uint16_t yrow = y + (flip ? h - row - 1 : row);
display.writeImage(output_row_mono_buffer, output_row_color_buffer, x, yrow, w, 1);
} // end line
Serial.print("loaded in "); Serial.print(millis() - startTime); Serial.println(" ms");
display.refresh();
}
}
}
file.close();
if (!valid)
{
Serial.println("bitmap format not handled.");
}
}
void drawBitmapFromSpiffs_Buffered(const char *filename, int16_t x, int16_t y, bool with_color, bool partial_update, bool overwrite)
{
fs::File file;
bool valid = false; // valid format to be handled
bool flip = true; // bitmap is stored bottom-to-top
bool has_multicolors = (display.epd2.panel == GxEPD2::ACeP565) || (display.epd2.panel == GxEPD2::GDEY073D46);
uint32_t startTime = millis();
if ((x >= display.width()) || (y >= display.height())) return;
Serial.println();
Serial.print("Loading image '");
Serial.print(filename);
Serial.println('\'');
#if defined(ESP32)
file = SPIFFS.open(String("/") + filename, "r");
#else
file = LittleFS.open(filename, "r");
#endif
if (!file)
{
Serial.print("File not found");
return;
}
// Parse BMP header
if (read16(file) == 0x4D42) // BMP signature
{
uint32_t fileSize = read32(file);
uint32_t creatorBytes = read32(file); (void)creatorBytes; //unused
uint32_t imageOffset = read32(file); // Start of image data
uint32_t headerSize = read32(file);
uint32_t width = read32(file);
int32_t height = (int32_t) read32(file);
uint16_t planes = read16(file);
uint16_t depth = read16(file); // bits per pixel
uint32_t format = read32(file);
if ((planes == 1) && ((format == 0) || (format == 3))) // uncompressed is handled, 565 also
{
Serial.print("File size: "); Serial.println(fileSize);
Serial.print("Image Offset: "); Serial.println(imageOffset);
Serial.print("Header size: "); Serial.println(headerSize);
Serial.print("Bit Depth: "); Serial.println(depth);
Serial.print("Image size: ");
Serial.print(width);
Serial.print('x');
Serial.println(height);
// BMP rows are padded (if needed) to 4-byte boundary
uint32_t rowSize = (width * depth / 8 + 3) & ~3;
if (depth < 8) rowSize = ((width * depth + 8 - depth) / 8 + 3) & ~3;
if (height < 0)
{
height = -height;
flip = false;
}
uint16_t w = width;
uint16_t h = height;
if ((x + w - 1) >= display.width()) w = display.width() - x;
if ((y + h - 1) >= display.height()) h = display.height() - y;
//if (w <= max_row_width) // handle with direct drawing
{
valid = true;
uint8_t bitmask = 0xFF;
uint8_t bitshift = 8 - depth;
uint16_t red, green, blue;
bool whitish = false;
bool colored = false;
if (depth == 1) with_color = false;
if (depth <= 8)
{
if (depth < 8) bitmask >>= depth;
//file.seek(54); //palette is always @ 54
file.seek(imageOffset - (4 << depth)); // 54 for regular, diff for colorsimportant
for (uint16_t pn = 0; pn < (1 << depth); pn++)
{
blue = file.read();
green = file.read();
red = file.read();
file.read();
whitish = with_color ? ((red > 0x80) && (green > 0x80) && (blue > 0x80)) : ((red + green + blue) > 3 * 0x80); // whitish
colored = (red > 0xF0) || ((green > 0xF0) && (blue > 0xF0)); // reddish or yellowish?
if (0 == pn % 8) mono_palette_buffer[pn / 8] = 0;
mono_palette_buffer[pn / 8] |= whitish << pn % 8;
if (0 == pn % 8) color_palette_buffer[pn / 8] = 0;
color_palette_buffer[pn / 8] |= colored << pn % 8;
rgb_palette_buffer[pn] = ((red & 0xF8) << 8) | ((green & 0xFC) << 3) | ((blue & 0xF8) >> 3);
}
}
if (partial_update) display.setPartialWindow(x, y, w, h);
else display.setFullWindow();
display.firstPage();
do
{
if (!overwrite) display.fillScreen(GxEPD_WHITE);
uint32_t rowPosition = flip ? imageOffset + (height - h) * rowSize : imageOffset;
for (uint16_t row = 0; row < h; row++, rowPosition += rowSize) // for each line
{
uint32_t in_remain = rowSize;
uint32_t in_idx = 0;
uint32_t in_bytes = 0;
uint8_t in_byte = 0; // for depth <= 8
uint8_t in_bits = 0; // for depth <= 8
uint16_t color = GxEPD_WHITE;
file.seek(rowPosition);
for (uint16_t col = 0; col < w; col++) // for each pixel
{
// Time to read more pixel data?
if (in_idx >= in_bytes) // ok, exact match for 24bit also (size IS multiple of 3)
{
in_bytes = file.read(input_buffer, in_remain > sizeof(input_buffer) ? sizeof(input_buffer) : in_remain);
in_remain -= in_bytes;
in_idx = 0;
}
switch (depth)
{
case 32:
blue = input_buffer[in_idx++];
green = input_buffer[in_idx++];
red = input_buffer[in_idx++];
in_idx++; // skip alpha
whitish = with_color ? ((red > 0x80) && (green > 0x80) && (blue > 0x80)) : ((red + green + blue) > 3 * 0x80); // whitish
colored = (red > 0xF0) || ((green > 0xF0) && (blue > 0xF0)); // reddish or yellowish?
color = ((red & 0xF8) << 8) | ((green & 0xFC) << 3) | ((blue & 0xF8) >> 3);
break;
case 24:
blue = input_buffer[in_idx++];
green = input_buffer[in_idx++];
red = input_buffer[in_idx++];
whitish = with_color ? ((red > 0x80) && (green > 0x80) && (blue > 0x80)) : ((red + green + blue) > 3 * 0x80); // whitish
colored = (red > 0xF0) || ((green > 0xF0) && (blue > 0xF0)); // reddish or yellowish?
color = ((red & 0xF8) << 8) | ((green & 0xFC) << 3) | ((blue & 0xF8) >> 3);
break;
case 16:
{
uint8_t lsb = input_buffer[in_idx++];
uint8_t msb = input_buffer[in_idx++];
if (format == 0) // 555
{
blue = (lsb & 0x1F) << 3;
green = ((msb & 0x03) << 6) | ((lsb & 0xE0) >> 2);
red = (msb & 0x7C) << 1;
color = ((red & 0xF8) << 8) | ((green & 0xFC) << 3) | ((blue & 0xF8) >> 3);
}
else // 565
{
blue = (lsb & 0x1F) << 3;
green = ((msb & 0x07) << 5) | ((lsb & 0xE0) >> 3);
red = (msb & 0xF8);
color = (msb << 8) | lsb;
}
whitish = with_color ? ((red > 0x80) && (green > 0x80) && (blue > 0x80)) : ((red + green + blue) > 3 * 0x80); // whitish
colored = (red > 0xF0) || ((green > 0xF0) && (blue > 0xF0)); // reddish or yellowish?
}
break;
case 1:
case 2:
case 4:
case 8:
{
if (0 == in_bits)
{
in_byte = input_buffer[in_idx++];
in_bits = 8;
}
uint16_t pn = (in_byte >> bitshift) & bitmask;
whitish = mono_palette_buffer[pn / 8] & (0x1 << pn % 8);
colored = color_palette_buffer[pn / 8] & (0x1 << pn % 8);
in_byte <<= depth;
in_bits -= depth;
color = rgb_palette_buffer[pn];
}
break;
}
if (with_color && has_multicolors)
{
// keep color
}
else if (whitish)
{
color = GxEPD_WHITE;
}
else if (colored && with_color)
{
color = GxEPD_COLORED;
}
else
{
color = GxEPD_BLACK;
}
uint16_t yrow = y + (flip ? h - row - 1 : row);
display.drawPixel(x + col, yrow, color);
} // end pixel
} // end line
}
while (display.nextPage());
Serial.print("loaded in "); Serial.print(millis() - startTime); Serial.println(" ms");
}
}
}
file.close();
if (!valid)
{
Serial.println("bitmap format not handled.");
}
}
uint16_t read16(fs::File& f)
{
// BMP data is stored little-endian, same as Arduino.
uint16_t result;
((uint8_t *)&result)[0] = f.read(); // LSB
((uint8_t *)&result)[1] = f.read(); // MSB
return result;
}
uint32_t read32(fs::File& f)
{
// BMP data is stored little-endian, same as Arduino.
uint32_t result;
((uint8_t *)&result)[0] = f.read(); // LSB
((uint8_t *)&result)[1] = f.read();
((uint8_t *)&result)[2] = f.read();
((uint8_t *)&result)[3] = f.read(); // MSB
return result;
}
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