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#include "ScrollMessage.hpp"
#include "OLED.hpp"
#include "configuration.h"
/**
* Counts the number of chars in the string excluding the null terminator.
* This is a custom version of `strlen` which takes into account our custom
* double-byte char encoding.
* @param str The input string.
* @return The length of the string.
*/
static uint16_t str_display_len(const char *const str) {
const uint8_t *next = reinterpret_cast<const uint8_t *>(str);
uint16_t count = 0;
while (next[0]) {
if (next[0] <= 0xF0) {
count++;
next++;
} else {
if (!next[1]) {
break;
}
count++;
next += 2;
}
}
return count;
}
/**
* Calculate the width in pixels of the message string, in the large
* font and taking into account multi-byte chars.
*
* @param message The null-terminated message string.
*/
uint16_t messageWidth(const char *message) { return FONT_12_WIDTH * str_display_len(message); }
void drawScrollingText(const char *message, TickType_t currentTickOffset) {
OLED::clearScreen();
int16_t messageOffset;
uint16_t msgWidth = messageWidth(message);
if (msgWidth > OLED_WIDTH) {
messageOffset = (currentTickOffset / (getSettingValue(SettingsOptions::DescriptionScrollSpeed) == 1 ? TICKS_100MS / 10 : (TICKS_100MS / 5)));
messageOffset %= msgWidth + OLED_WIDTH; // Roll around at the end
if (messageOffset < OLED_WIDTH) {
// Snap the message to the left edge.
messageOffset = OLED_WIDTH;
} else if (messageOffset > msgWidth) {
// Snap the message to the right edge.
messageOffset = msgWidth;
}
} else {
// Centre the message without scrolling.
messageOffset = (OLED_WIDTH - msgWidth) / 2 + msgWidth;
}
//^ Rolling offset based on time
OLED::setCursor((OLED_WIDTH - messageOffset), 0);
OLED::print(message, FontStyle::LARGE);
}
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