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Add qr code support for displays (#2952)

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Co-authored-by: Oxan van Leeuwen <oxan@oxanvanleeuwen.nl>
This commit is contained in:
Wouter van der Wal
2022-01-26 10:20:45 +01:00
committed by GitHub
parent ef832becf1
commit a718ac7ee0
10 changed files with 167 additions and 4 deletions
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esphome/components/qr_code/qr_code.cpp
+55
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#include "qr_code.h"
#include "esphome/components/display/display_buffer.h"
#include "esphome/core/color.h"
#include "esphome/core/log.h"
namespace esphome {
namespace qr_code {
static const char *const TAG = "qr_code";
void QrCode::dump_config() {
ESP_LOGCONFIG(TAG, "QR code:");
ESP_LOGCONFIG(TAG, " Value: '%s'", this->value_.c_str());
}
void QrCode::set_value(const std::string &value) {
this->value_ = value;
this->needs_update_ = true;
}
void QrCode::set_ecc(qrcodegen_Ecc ecc) {
this->ecc_ = ecc;
this->needs_update_ = true;
}
void QrCode::generate_qr_code() {
ESP_LOGV(TAG, "Generating QR code...");
uint8_t tempbuffer[qrcodegen_BUFFER_LEN_MAX];
if (!qrcodegen_encodeText(this->value_.c_str(), tempbuffer, this->qr_, this->ecc_, qrcodegen_VERSION_MIN,
qrcodegen_VERSION_MAX, qrcodegen_Mask_AUTO, true)) {
ESP_LOGE(TAG, "Failed to generate QR code");
}
}
void QrCode::draw(display::DisplayBuffer *buff, uint16_t x_offset, uint16_t y_offset, Color color, int scale) {
ESP_LOGV(TAG, "Drawing QR code at (%d, %d)", x_offset, y_offset);
if (this->needs_update_) {
this->generate_qr_code();
this->needs_update_ = false;
}
uint8_t qrcode_width = qrcodegen_getSize(this->qr_);
for (int y = 0; y < qrcode_width * scale; y++) {
for (int x = 0; x < qrcode_width * scale; x++) {
if (qrcodegen_getModule(this->qr_, x / scale, y / scale)) {
buff->draw_pixel_at(x_offset + x, y_offset + y, color);
}
}
}
}
} // namespace qr_code
} // namespace esphome