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