Fix the label corruption issue

.vscode/launch.json

@@ -9,12 +9,15 @@
       "type": "cppdbg",
       "request": "launch",
       "program": "${workspaceFolder}/builddir/ptprnt",
-      "args": ["-t Hello"],
+      "args": [
+        "-t i"
+      ],
       "stopAtEntry": false,
-      "cwd": "${fileDirname}",
+      "cwd": "${workspaceFolder}",
       "environment": [],
       "externalConsole": false,
-      "MIMode": "lldb",
+      "MIMode": "gdb",
+      "miDebuggerPath": "/usr/bin/gdb",
       "setupCommands": [
         {
           "description": "Automatische Strukturierung und Einrückung für \"gdb\" aktivieren",

.vscode/settings.json

@@ -1,5 +1,8 @@
 {
-  "clangd.arguments": ["-background-index", "-compile-commands-dir=builddir/"],
+  "clangd.arguments": [
+    "-background-index",
+    "-compile-commands-dir=builddir/"
+  ],
   "editor.formatOnType": false,
   "editor.formatOnSave": true,
   "files.associations": {
@@ -84,4 +87,7 @@
     "*.ipp": "cpp"
   },
   "clangd.onConfigChanged": "restart",
+  "cSpell.words": [
+    "ptrnt"
+  ],
 }

src/PrinterDriverFactory.cpp

@@ -4,7 +4,8 @@
 
 #include <memory>
 
-#include "P700Printer.hpp"
+#include "printers/P700Printer.hpp"
+#include "printers/FakePrinter.hpp"
 #include "libusbwrap/LibUsbTypes.hpp"
 
 namespace ptprnt {
@@ -20,4 +21,33 @@ std::shared_ptr<IPrinterDriver> PrinterDriverFactory::create(libusbwrap::usbId i
     return nullptr;
 }
 
+std::shared_ptr<IPrinterDriver> PrinterDriverFactory::createFakePrinter() {
+    spdlog::info("Creating FakePrinter (virtual test printer)");
+    return std::make_shared<printer::FakePrinter>();
+}
+
+std::shared_ptr<IPrinterDriver> PrinterDriverFactory::createByName(const std::string& driverName) {
+    // Convert to lowercase for case-insensitive comparison
+    std::string nameLower = driverName;
+    std::transform(nameLower.begin(), nameLower.end(), nameLower.begin(),
+                   [](unsigned char c) { return std::tolower(c); });
+
+    if (nameLower == "p700" || nameLower == "p700printer") {
+        spdlog::info("Creating P700 printer driver by name");
+        return std::make_shared<printer::P700Printer>();
+    } else if (nameLower == "fakeprinter" || nameLower == "fake") {
+        return createFakePrinter();
+    }
+
+    spdlog::warn("Unknown printer driver name: {}", driverName);
+    return nullptr;
+}
+
+std::vector<std::string> PrinterDriverFactory::listAllDrivers() const {
+    return {
+        std::string(printer::P700Printer::mInfo.driverName),
+        std::string(printer::FakePrinter::mInfo.driverName)
+    };
+}
+
 }  // namespace ptprnt

src/PrinterDriverFactory.hpp

@@ -1,4 +1,6 @@
 #include <memory>
+#include <vector>
+#include <string>
 #include "interface/IPrinterDriver.hpp"
 #include "libusbwrap/LibUsbTypes.hpp"
 
@@ -14,8 +16,32 @@ class PrinterDriverFactory {
     PrinterDriverFactory(PrinterDriverFactory&&)                 = delete;
     PrinterDriverFactory& operator=(PrinterDriverFactory&&)      = delete;
 
+    /**
+     * @brief Create a printer driver based on USB ID
+     * @param id USB vendor and product ID
+     * @return Printer driver instance or nullptr if no match
+     */
     std::shared_ptr<IPrinterDriver> create(libusbwrap::usbId id);
 
+    /**
+     * @brief Create a virtual FakePrinter for testing without hardware
+     * @return FakePrinter instance
+     */
+    std::shared_ptr<IPrinterDriver> createFakePrinter();
+
+    /**
+     * @brief Create a printer driver by name
+     * @param driverName Name of the driver (from PrinterInfo.driverName)
+     * @return Printer driver instance or nullptr if no match
+     */
+    std::shared_ptr<IPrinterDriver> createByName(const std::string& driverName);
+
+    /**
+     * @brief Get list of all available printer driver names
+     * @return Vector of driver names
+     */
+    std::vector<std::string> listAllDrivers() const;
+
    private:
 };
 

src/PtouchPrint.cpp

@@ -71,24 +71,87 @@ int PtouchPrint::init(int argc, char** argv) {
 int PtouchPrint::run() {
     spdlog::info("ptprnt version {}", mVersionString);
     SPDLOG_TRACE("testing trace");
-    mDetectedPrinters     = getCompatiblePrinters();
-    auto numFoundPrinters = mDetectedPrinters.size();
-    if (numFoundPrinters == 0) {
-        spdlog::error("No compatible printers found, please make sure that they are turned on and connected");
-        return -1;
-    } else if (numFoundPrinters > 1) {
-        spdlog::warn("Found more than one compatible printer. Currently not supported.");
-        return -1;
+
+    // Handle --list-all-drivers flag
+    if (mListDriversFlag) {
+        auto driverFactory = std::make_unique<PrinterDriverFactory>();
+        auto drivers       = driverFactory->listAllDrivers();
+
+        fmt::print("Available printer drivers:\n");
+        for (const auto& driver : drivers) {
+            fmt::print("  - {}\n", driver);
+        }
+        fmt::print("\nUse with: -p <driver_name> or --printer <driver_name>\n");
+        return 0;
     }
 
-    auto printer            = mDetectedPrinters[0];
-    const auto printerUsbId = printer->getUsbId();
-    auto devices            = mUsbDeviceFactory.findDevices(printerUsbId.first, printerUsbId.second);
-    if (devices.size() != 1) {
-        spdlog::warn("Found more than one device of the same printer on bus. Currently not supported");
-        return -1;
+    // Determine which printer to use
+    std::shared_ptr<IPrinterDriver> printer = nullptr;
+
+    if (mPrinterSelection != "auto") {
+        // Explicit printer selection by name
+        auto driverFactory = std::make_unique<PrinterDriverFactory>();
+        printer            = driverFactory->createByName(mPrinterSelection);
+
+        if (!printer) {
+            spdlog::error("Failed to create printer driver '{}'", mPrinterSelection);
+            spdlog::info("Use --list-all-drivers to see available drivers");
+            return -1;
+        }
+
+        spdlog::info("Using explicitly selected printer: {}", mPrinterSelection);
+
+        // FakePrinter doesn't need USB device attachment
+        if (mPrinterSelection == "FakePrinter" || mPrinterSelection == "fake") {
+            printer->attachUsbDevice(nullptr);
+        } else {
+            // Real printer needs USB device
+            const auto printerUsbId = printer->getUsbId();
+            auto devices            = mUsbDeviceFactory.findDevices(printerUsbId.first, printerUsbId.second);
+
+            if (devices.empty()) {
+                spdlog::error("No USB device found for printer {}. Is it connected and powered on?", mPrinterSelection);
+                return -1;
+            }
+
+            if (devices.size() > 1) {
+                spdlog::warn("Found more than one device of the same printer on bus. Using first one.");
+            }
+
+            if (!printer->attachUsbDevice(std::move(devices[0]))) {
+                spdlog::error("Failed to attach USB device to printer");
+                return -1;
+            }
+        }
+    } else {
+        // Auto-detect printer from USB devices
+        mDetectedPrinters     = getCompatiblePrinters();
+        auto numFoundPrinters = mDetectedPrinters.size();
+
+        if (numFoundPrinters == 0) {
+            spdlog::error("No compatible printers found, please make sure that they are turned on and connected");
+            spdlog::info("Tip: Use -p FakePrinter for testing without hardware");
+            return -1;
+        } else if (numFoundPrinters > 1) {
+            spdlog::warn("Found more than one compatible printer. Use -p to select explicitly.");
+            return -1;
+        }
+
+        printer                 = mDetectedPrinters[0];
+        const auto printerUsbId = printer->getUsbId();
+        auto devices            = mUsbDeviceFactory.findDevices(printerUsbId.first, printerUsbId.second);
+
+        if (devices.size() != 1) {
+            spdlog::warn("Found more than one device of the same printer on bus. Currently not supported");
+            return -1;
+        }
+
+        if (!printer->attachUsbDevice(std::move(devices[0]))) {
+            spdlog::error("Failed to attach USB device to printer");
+            return -1;
+        }
     }
-    printer->attachUsbDevice(std::move(devices[0]));
+
     auto status = printer->getPrinterStatus();
     spdlog::info("Detected tape width is {}mm", status.tapeWidthMm);
 
@@ -150,10 +213,10 @@ int PtouchPrint::run() {
     }
     label->create(labelText);
     label->writeToPng("./testlabel.png");
-    /*if (!printer->printLabel(std::move(label))) {
+    if (!printer->printLabel(std::move(label))) {
         spdlog::error("An error occured while printing");
         return -1;
-    }*/
+    }
 
     return 0;
 }
@@ -203,6 +266,13 @@ void PtouchPrint::setupCliParser() {
     mApp.add_flag("-v,--verbose", mVerboseFlag, "Enable verbose output");
     mApp.add_flag("-V,--version", printVersion, "Prints the ptprnt's version");
 
+    // Printer selection
+    mApp.add_option("-p,--printer", mPrinterSelection,
+                    "Select printer driver (default: auto). Use --list-all-drivers to see available options")
+        ->default_val("auto");
+
+    mApp.add_flag("--list-all-drivers", mListDriversFlag, "List all available printer drivers and exit");
+
     // Text printing options
     mApp.add_option("-t,--text",
                     "Text to print (can be used multple times, use formatting options before to "
@@ -227,7 +297,7 @@ void PtouchPrint::setupCliParser() {
         ->trigger_on_parse()
         ->transform([](std::string in) -> std::string {
             std::unordered_set<std::string> validValignOptions{"top", "middle", "bottom"};
-            std::transform(in.begin(), in.end(), in.begin(), [](unsigned char c) { return std::tolower(c); });
+            std::ranges::transform(in, in.begin(), [](unsigned char c) { return std::tolower(c); });
             if (validValignOptions.find(in) == validValignOptions.end()) {
                 return {""};
             }

src/PtouchPrint.hpp

@@ -58,7 +58,9 @@ class PtouchPrint {
     std::vector<CliCmd> mCommands{};
     std::string mVersionString = "";
 
-    // CLI flags
+    // CLI flags and options
     bool mVerboseFlag = false;
+    std::string mPrinterSelection = "auto";
+    bool mListDriversFlag = false;
 };
 }  // namespace ptprnt

src/graphics/Label.cpp

@@ -37,19 +37,43 @@
 
 namespace ptprnt::graphics {
 Label::Label(const uint16_t heightPixel)
-    : mCairoCtx(cairo_create(mSurface)),
-      mPangoCtx(pango_cairo_create_context(mCairoCtx)),
-      mPangoLyt(pango_layout_new(mPangoCtx)),
-      mFontMap(pango_cairo_font_map_new()),
-      mPrinterHeight(heightPixel) {}
+    : mPrinterHeight(heightPixel) {
+    // Initialize resources in correct order with RAII
+    mFontMap.reset(pango_cairo_font_map_new());
+}
 
 std::vector<uint8_t> Label::getRaw() {
     assert(mSurface != nullptr);
-    size_t len = mPrinterHeight * mLayoutWidth;
+    auto* surface = mSurface.get();
 
-    cairo_surface_flush(mSurface);
-    auto data = cairo_image_surface_get_data(mSurface);
-    return {data, data + len};
+    cairo_surface_flush(surface);
+    assert(cairo_image_surface_get_format(surface) == CAIRO_FORMAT_A8);
+
+    int width = cairo_image_surface_get_width(surface);
+    int height = cairo_image_surface_get_height(surface);
+    int stride = cairo_image_surface_get_stride(surface);
+
+    spdlog::debug("Cairo Surface data: W: {}; H: {}; S:{}", width, height, stride);
+
+    auto data = cairo_image_surface_get_data(surface);
+
+    // If stride equals width, we can return data directly
+    if (stride == width) {
+        size_t len = height * stride;
+        return {data, data + len};
+    }
+
+    // Otherwise, we need to copy row by row, removing stride padding
+    std::vector<uint8_t> result;
+    result.reserve(width * height);
+
+    for (int y = 0; y < height; ++y) {
+        uint8_t* row_start = data + (y * stride);
+        result.insert(result.end(), row_start, row_start + width);
+    }
+
+    spdlog::debug("getRaw: Removed stride padding, returning {} bytes ({}x{})", result.size(), width, height);
+    return result;
 }
 
 uint8_t Label::getNumLines(std::string_view strv) {
@@ -57,11 +81,13 @@ uint8_t Label::getNumLines(std::string_view strv) {
 }
 
 int Label::getWidth() {
-    return mPrinterHeight;
+    // Return the actual Cairo surface width (which is the layout width)
+    return mLayoutWidth;
 }
 
 int Label::getHeight() {
-    return getLayoutWidth();
+    // Return the actual Cairo surface height (which is the printer height)
+    return mPrinterHeight;
 }
 
 int Label::getLayoutHeight() {
@@ -72,6 +98,35 @@ int Label::getLayoutWidth() {
     return mLayoutWidth;
 }
 
+void Label::configureLayout(PangoLayout* layout, const std::string& text, PangoFontDescription* fontDesc) {
+    pango_layout_set_font_description(layout, fontDesc);
+    pango_layout_set_text(layout, text.c_str(), static_cast<int>(text.length()));
+    pango_layout_set_height(layout, getNumLines(text) * -1);
+}
+
+void Label::applyHorizontalAlignment(PangoLayout* layout) {
+    switch (mHAlign) {
+        case HAlignPosition::LEFT:
+            pango_layout_set_alignment(layout, PANGO_ALIGN_LEFT);
+            break;
+        case HAlignPosition::RIGHT:
+            pango_layout_set_alignment(layout, PANGO_ALIGN_RIGHT);
+            break;
+        case HAlignPosition::JUSTIFY:
+            pango_layout_set_alignment(layout, PANGO_ALIGN_LEFT);
+            pango_layout_set_justify(layout, true);
+#if PANGO_VERSION_MAJOR >= 1 && PANGO_VERSION_MINOR >= 50
+            pango_layout_set_justify_last_line(layout, true);
+#endif
+            break;
+        case HAlignPosition::CENTER:
+            [[fallthrough]];
+        default:
+            pango_layout_set_alignment(layout, PANGO_ALIGN_CENTER);
+            break;
+    }
+}
+
 bool Label::create(PrintableText printableText) {
     setFontFamily(printableText.fontFamily);
     setFontSize(printableText.fontSize);
@@ -80,79 +135,78 @@ bool Label::create(PrintableText printableText) {
 }
 
 bool Label::create(const std::string& labelText) {
-    // TODO: we need to create a custom fontconfig here so that Noto Emoji does not load the systems default
-    // fontconfig here. For this, we need to create a PangoFcFontMap and a custom FcConfig
+    // TODO: we need to create a custom font config here so that Noto Emoji does not load the systems default
+    // font config here. For this, we need to create a PangoFcFontMap and a custom FcConfig
     // see: https://docs.gtk.org/PangoFc/method.FontMap.set_config.html
     // see: https://gist.github.com/CallumDev/7c66b3f9cf7a876ef75f
+
+    // Create a temporary surface for layout size calculations
+    auto* tempSurface = cairo_image_surface_create(CAIRO_FORMAT_A8, 1, 1);
+    auto* tempCr = cairo_create(tempSurface);
+    auto* tempPangoCtx = pango_cairo_create_context(tempCr);
+    auto* tempPangoLyt = pango_layout_new(tempPangoCtx);
+
     PangoFontDescription* regularFont = pango_font_description_new();
     pango_font_description_set_size(regularFont, static_cast<int>(mFontSize * PANGO_SCALE));
     pango_font_description_set_family(regularFont, mFontFamily.c_str());
-    //pango_layout_set_single_paragraph_mode(mPangoLyt, true); // this will force a single line in the label width width -1
-    pango_layout_set_height(mPangoLyt, getNumLines(labelText) * -1);
-    pango_layout_set_font_description(mPangoLyt, regularFont);
-    pango_layout_set_text(mPangoLyt, labelText.c_str(), static_cast<int>(labelText.length()));
 
-    // Set horizontal alignment
-    switch (mHAlign) {
-        case HAlignPosition::LEFT:
-            pango_layout_set_alignment(mPangoLyt, PANGO_ALIGN_LEFT);
-            break;
-        case HAlignPosition::RIGHT:
-            pango_layout_set_alignment(mPangoLyt, PANGO_ALIGN_RIGHT);
-            break;
-        case HAlignPosition::JUSTIFY:
-            pango_layout_set_alignment(mPangoLyt, PANGO_ALIGN_LEFT);  // not sure if needed
-            pango_layout_set_justify(mPangoLyt, true);
-// only enabled in pango 1.50 and greater
-#if PANGO_VERSION_MAJOR >= 1 && PANGO_VERSION_MINOR >= 50
-            pango_layout_set_justify_last_line(mPangoLyt, true);
-#endif
-            break;
-        case HAlignPosition::CENTER:
-            [[fallthrough]];
-        default:
-            pango_layout_set_alignment(mPangoLyt, PANGO_ALIGN_CENTER);
-            break;
-    }
+    // Configure temporary layout for size calculation
+    configureLayout(tempPangoLyt, labelText, regularFont);
+    applyHorizontalAlignment(tempPangoLyt);
 
-    // calculate label size for Cairo surface creation
-    pango_layout_get_size(mPangoLyt, &mLayoutWidth, &mLayoutHeight);
+    // Calculate label size from temporary layout
+    pango_layout_get_size(tempPangoLyt, &mLayoutWidth, &mLayoutHeight);
     mLayoutWidth /= PANGO_SCALE;
     mLayoutHeight /= PANGO_SCALE;
 
     spdlog::debug("Layout width: {}, height: {}", mLayoutWidth, mLayoutHeight);
-    auto alignedWidth = mLayoutWidth + (8 - (mLayoutWidth % 8));
+    //auto alignedWidth = mLayoutWidth + (8 - (mLayoutWidth % 8));
+    //spdlog::debug("Aligned Layout width: {}, height: {}", alignedWidth, mLayoutHeight);
 
-    mSurface    = cairo_image_surface_create(CAIRO_FORMAT_A8, alignedWidth, mPrinterHeight);
-    cairo_t* cr = cairo_create(mSurface);
+    // Clean up temporary resources
+    g_object_unref(tempPangoLyt);
+    g_object_unref(tempPangoCtx);
+    cairo_destroy(tempCr);
+    cairo_surface_destroy(tempSurface);
+
+    // Now create the final surface and Pango context for actual rendering
+    mSurface.reset(cairo_image_surface_create(CAIRO_FORMAT_A8, mLayoutWidth, mPrinterHeight));
+    cairo_t* cr = cairo_create(mSurface.get());
+    mCairoCtx.reset(cr);
+    mPangoCtx.reset(pango_cairo_create_context(cr));
+    mPangoLyt.reset(pango_layout_new(mPangoCtx.get()));
+
+    // Configure final layout with same settings
+    configureLayout(mPangoLyt.get(), labelText, regularFont);
+    applyHorizontalAlignment(mPangoLyt.get());
 
     // Adjust Cairo cursor position to respect the vertical alignment
     switch (mVAlign) {
         case VAlignPosition::TOP:
             break;
         case VAlignPosition::BOTTOM:
-            cairo_move_to(cr, 0.0, mPrinterHeight - mLayoutHeight);
+            cairo_move_to(mCairoCtx.get(), 0.0, mPrinterHeight - mLayoutHeight);
             break;
         case VAlignPosition::MIDDLE:
-            cairo_move_to(cr, 0.0, (mPrinterHeight - mLayoutHeight) / 2);
+            cairo_move_to(mCairoCtx.get(), 0.0, (mPrinterHeight - mLayoutHeight) / 2);
             [[fallthrough]];
         default:
             break;
     }
 
     // Finally show the layout on the Cairo surface
-    pango_cairo_show_layout(cr, mPangoLyt);
+    pango_cairo_show_layout(mCairoCtx.get(), mPangoLyt.get());
 
-    cairo_set_source_rgb(cr, 0.0, 0.0, 0.0);
-    cairo_surface_flush(mSurface);
-    cairo_destroy(cr);
+    cairo_set_source_rgb(mCairoCtx.get(), 0.0, 0.0, 0.0);
+    cairo_surface_flush(mSurface.get());
+    // mCairoCtx smart pointer will handle cleanup
     return true;
 }
 
 void Label::writeToPng(const std::string& file) {
     if (mSurface) {
-        cairo_surface_flush(mSurface);
-        cairo_surface_write_to_png(mSurface, file.c_str());
+        cairo_surface_flush(mSurface.get());
+        cairo_surface_write_to_png(mSurface.get(), file.c_str());
     }
 }
 
@@ -178,9 +232,6 @@ void Label::setText(const std::string& text) {
 
 Label::~Label() {
     spdlog::debug("Image dtor...");
-    g_object_unref(mPangoCtx);
-    g_object_unref(mPangoLyt);
-    g_object_unref(mFontMap);
-    cairo_surface_destroy(mSurface);
+    // RAII smart pointers handle cleanup automatically
 }
 }  // namespace ptprnt::graphics

src/graphics/Label.hpp

@@ -22,6 +22,7 @@
 #include <pango/pangocairo.h>
 
 #include <cstdint>
+#include <memory>
 #include <string>
 #include <vector>
 
@@ -31,6 +32,28 @@
 
 namespace ptprnt::graphics {
 
+// Custom deleters for Cairo/Pango resources
+struct CairoSurfaceDeleter {
+    void operator()(cairo_surface_t* surface) const {
+        if (surface)
+            cairo_surface_destroy(surface);
+    }
+};
+
+struct CairoDeleter {
+    void operator()(cairo_t* cr) const {
+        if (cr)
+            cairo_destroy(cr);
+    }
+};
+
+struct GObjectDeleter {
+    void operator()(gpointer obj) const {
+        if (obj)
+            g_object_unref(obj);
+    }
+};
+
 class Label : public ILabel {
    public:
     Label(const uint16_t heightPixel);
@@ -60,13 +83,14 @@ class Label : public ILabel {
     // methods
     [[nodiscard]] uint8_t getNumLines(std::string_view str);
     [[nodiscard]] PangoFontMap* createCustomFontMap();
-    // members
-    // TODO: convert raw pointers here into std::unique_ptr with custom deleters, calling g_object_unref()
-    cairo_surface_t* mSurface{nullptr};
-    cairo_t* mCairoCtx{nullptr};
-    PangoContext* mPangoCtx{nullptr};
-    PangoLayout* mPangoLyt{nullptr};
-    PangoFontMap* mFontMap{nullptr};
+    void configureLayout(PangoLayout* layout, const std::string& text, PangoFontDescription* fontDesc);
+    void applyHorizontalAlignment(PangoLayout* layout);
+
+    std::unique_ptr<cairo_surface_t, CairoSurfaceDeleter> mSurface{nullptr};
+    std::unique_ptr<cairo_t, CairoDeleter> mCairoCtx{nullptr};
+    std::unique_ptr<PangoContext, GObjectDeleter> mPangoCtx{nullptr};
+    std::unique_ptr<PangoLayout, GObjectDeleter> mPangoLyt{nullptr};
+    std::unique_ptr<PangoFontMap, GObjectDeleter> mFontMap{nullptr};
     double mFontSize{DEFAULT_FONT_SIZE};
     std::string mFontFamily{DEFAULT_FONT_FAMILY};
     HAlignPosition mHAlign = HAlignPosition::LEFT;

src/graphics/Monochrome.cpp

@@ -25,71 +25,85 @@
 #include <vector>
 
 namespace ptprnt::graphics {
-Monochrome::Monochrome(const std::vector<uint8_t>& grayscale, uint32_t width, uint32_t height)
-    : mPixels(grayscale), mWidth(width), mHeight(height) {}
+// Constructor from grayscale data
+MonochromeData::MonochromeData(const std::vector<uint8_t>& grayscale, uint32_t width, uint32_t height, 
+                               Orientation orient)
+    : stride(0),
+      orientation(orient),
+      width(width),
+      height(height),
+      mPixels(grayscale),
+      mIsProcessed(false) {}
 
-Monochrome::Monochrome(const std::span<uint8_t> grayscale, uint32_t width, uint32_t height)
-    : mPixels(grayscale.begin(), grayscale.end()), mWidth(width), mHeight(height) {}
+MonochromeData::MonochromeData(const std::span<uint8_t> grayscale, uint32_t width, uint32_t height,
+                               Orientation orient)
+    : stride(0),
+      orientation(orient),
+      width(width),
+      height(height),
+      mPixels(grayscale.begin(), grayscale.end()),
+      mIsProcessed(false) {}
 
-void Monochrome::setThreshold(uint8_t threshhold) {
-    mThreshhold = threshhold;
+void MonochromeData::setThreshold(uint8_t threshold) {
+    mThreshold   = threshold;
+    mIsProcessed = false;  // Mark as needing reprocessing
 }
 
-void Monochrome::invert(bool shouldInvert) {
+void MonochromeData::invert(bool shouldInvert) {
     mShouldInvert = shouldInvert;
+    mIsProcessed  = false;  // Mark as needing reprocessing
 }
 
-std::vector<uint8_t> Monochrome::get() {
-    // Calculate output size for packed format: (width + 7) / 8 bytes per row
-    uint32_t stride   = (mWidth + 7) / 8;
-    size_t outputSize = stride * mHeight;
-    std::vector<uint8_t> outPixels(outputSize, 0);
+MonochromeData MonochromeData::get() {
+    if (!mIsProcessed) {
+        processGrayscaleToMonochrome();
+        mIsProcessed = true;
+    }
 
-    // Pack pixels row by row for correct 2D layout
-    for (uint32_t y = 0; y < mHeight; ++y) {
-        for (uint32_t x = 0; x < mWidth; ++x) {
-            size_t pixelIndex = y * mWidth + x;      // Row-major index in input
-            size_t byteIndex  = y * stride + x / 8;  // Byte index in packed output
-            size_t bitIndex   = 7 - (x % 8);         // MSB first
+    // Return a copy of the processed data
+    MonochromeData result;
+    result.bytes        = bytes;
+    result.stride       = stride;
+    result.orientation  = orientation;
+    result.width        = width;
+    result.height       = height;
+    result.mIsProcessed = true;
+    return result;
+}
 
-            // Convert grayscale pixel to bit based on threshold
-            bool pixelOn = mPixels[pixelIndex] > mThreshhold;
-            if (mShouldInvert) {
-                pixelOn = !pixelOn;
-            }
+void MonochromeData::processGrayscaleToMonochrome() {
+    // Calculate stride based on packed monochrome data (1 bit per pixel, 8 pixels per byte)
+    stride = static_cast<uint32_t>((width + 7) / 8);
 
-            if (pixelOn) {
-                outPixels[byteIndex] |= (1 << bitIndex);
+    // Create the monochrome byte array
+    bytes.clear();
+    bytes.resize(stride * height, 0);
+
+    // Convert grayscale to monochrome
+    for (uint32_t y = 0; y < height; ++y) {
+        for (uint32_t x = 0; x < width; ++x) {
+            uint32_t pixelIndex = y * width + x;
+            if (pixelIndex < mPixels.size()) {
+                uint8_t pixelValue = mPixels[pixelIndex];
+
+                // Apply threshold
+                bool isSet = pixelValue >= mThreshold;
+
+                // Apply inversion if needed
+                if (mShouldInvert) {
+                    isSet = !isSet;
+                }
+
+                // Set the bit in the monochrome data
+                if (isSet) {
+                    setBit(x, y, true);
+                }
             }
         }
     }
-
-    return outPixels;
 }
 
-void Monochrome::visualize() {
-    auto mono = get();
-    for (unsigned char pix : mono) {
-        std::cout << ((pix & (1 << 7)) == 0 ? "." : "x");
-        std::cout << ((pix & (1 << 6)) == 0 ? "." : "x");
-        std::cout << ((pix & (1 << 5)) == 0 ? "." : "x");
-        std::cout << ((pix & (1 << 4)) == 0 ? "." : "x");
-        std::cout << ((pix & (1 << 3)) == 0 ? "." : "x");
-        std::cout << ((pix & (1 << 2)) == 0 ? "." : "x");
-        std::cout << ((pix & (1 << 1)) == 0 ? "." : "x");
-        std::cout << ((pix & (1 << 0)) == 0 ? "." : "x");
-    }
-    std::cout << std::endl;
-}
-
-MonochromeData Monochrome::getMonochromeData() {
-    auto processedBytes = get();
-    // Calculate stride based on packed monochrome data (1 bit per pixel, 8 pixels per byte)
-    auto stride = static_cast<uint32_t>((mWidth + 7) / 8);
-    return {std::move(processedBytes), stride, Orientation::LANDSCAPE, mWidth, mHeight};
-}
-
-// MonochromeData transformation methods implementation
+// Transformation methods implementation
 void MonochromeData::transformTo(Orientation targetOrientation) {
     if (orientation == targetOrientation) {
         return;  // No transformation needed
@@ -151,7 +165,7 @@ void MonochromeData::setBit(uint32_t x, uint32_t y, bool value) {
 }
 
 std::vector<uint8_t> MonochromeData::createRotatedData(Orientation targetOrientation) const {
-    uint32_t newWidth, newHeight;
+    uint32_t newWidth = 0, newHeight = 0;
 
     // Determine new dimensions
     switch (targetOrientation) {
@@ -182,8 +196,8 @@ std::vector<uint8_t> MonochromeData::createRotatedData(Orientation targetOrienta
     // Copy pixels with appropriate transformation
     for (uint32_t y = 0; y < height; ++y) {
         for (uint32_t x = 0; x < width; ++x) {
-            bool pixel = getBit(x, y);
-            uint32_t newX, newY;
+            bool pixel    = getBit(x, y);
+            uint32_t newX = 0, newY = 0;
 
             switch (targetOrientation) {
                 case Orientation::LANDSCAPE:

src/graphics/Monochrome.hpp

@@ -34,19 +34,38 @@ enum class Orientation {
     PORTRAIT_FLIPPED  = 3   // 270 degrees clockwise (90 counter-clockwise)
 };
 
-struct MonochromeData {
-    std::vector<uint8_t> bytes;
-    uint32_t stride;
-    Orientation orientation;
-    uint32_t width;   // Width in pixels
-    uint32_t height;  // Height in pixels
-
+class MonochromeData {
+   public:
+    // Constructors
     MonochromeData() : stride(0), orientation(Orientation::LANDSCAPE), width(0), height(0) {}
 
     MonochromeData(std::vector<uint8_t> data, uint32_t stride_bytes, Orientation orient = Orientation::LANDSCAPE,
                    uint32_t w = 0, uint32_t h = 0)
         : bytes(std::move(data)), stride(stride_bytes), orientation(orient), width(w), height(h) {}
 
+    // Constructor from grayscale data (replaces old Monochrome class)
+    MonochromeData(const std::vector<uint8_t>& grayscale, uint32_t width, uint32_t height,
+                   Orientation orient = Orientation::LANDSCAPE);
+    MonochromeData(const std::span<uint8_t> grayscale, uint32_t width, uint32_t height,
+                   Orientation orient = Orientation::LANDSCAPE);
+
+    ~MonochromeData() = default;
+
+    // Copy constructor and assignment
+    MonochromeData(const MonochromeData&)            = default;
+    MonochromeData& operator=(const MonochromeData&) = default;
+
+    // Move constructor and assignment
+    MonochromeData(MonochromeData&&)            = default;
+    MonochromeData& operator=(MonochromeData&&) = default;
+
+    // Configuration methods
+    void setThreshold(uint8_t threshold);
+    void invert(bool shouldInvert);
+
+    // Get processed monochrome data
+    MonochromeData get();
+
     // Transform the image data to the target orientation
     void transformTo(Orientation targetOrientation);
 
@@ -57,25 +76,25 @@ struct MonochromeData {
     [[nodiscard]] bool getBit(uint32_t x, uint32_t y) const;
     void setBit(uint32_t x, uint32_t y, bool value);
     [[nodiscard]] std::vector<uint8_t> createRotatedData(Orientation targetOrientation) const;
-};
 
-class Monochrome {
-   public:
-    Monochrome(const std::vector<uint8_t>& grayscale, uint32_t width, uint32_t height);
-    Monochrome(const std::span<uint8_t> grayscale, uint32_t width, uint32_t height);
-    ~Monochrome() = default;
-
-    void setThreshold(uint8_t);
-    void invert(bool shouldInvert);
-    void visualize();
-    std::vector<uint8_t> get();
-    MonochromeData getMonochromeData();
+    // Public member access for backward compatibility
+    std::vector<uint8_t> bytes;
+    uint32_t stride;
+    Orientation orientation;
+    uint32_t width;   // Width in pixels
+    uint32_t height;  // Height in pixels
 
    private:
-    std::vector<uint8_t> mPixels;
-    uint32_t mWidth;
-    uint32_t mHeight;
-    uint8_t mThreshhold = UINT8_MAX / 2;
-    bool mShouldInvert  = false;
+    // Processing parameters (for old Monochrome class compatibility)
+    std::vector<uint8_t> mPixels;  // Original grayscale pixels
+    uint8_t mThreshold = UINT8_MAX / 2;
+    bool mShouldInvert = false;
+    bool mIsProcessed  = false;  // Flag to indicate if conversion has been done
+
+    // Helper method to convert grayscale to monochrome
+    void processGrayscaleToMonochrome();
 };
+
+// For backward compatibility, create a type alias
+using Monochrome = MonochromeData;
 }  // namespace ptprnt::graphics

src/meson.build

@@ -6,7 +6,8 @@ ptprnt_hpps = files (
     'libusbwrap/UsbDevice.hpp',
     'interface/IPrinterDriver.hpp',
     'interface/IPrinterTypes.hpp',
-    'P700Printer.hpp',
+    'printers/P700Printer.hpp',
+    'printers/FakePrinter.hpp',
     'PtouchPrint.hpp',
     'PrinterDriverFactory.hpp',
     'graphics/Bitmap.hpp',
@@ -17,7 +18,8 @@ ptprnt_hpps = files (
 ptprnt_srcs = files (
     'PtouchPrint.cpp',
     'PrinterDriverFactory.cpp',
-    'P700Printer.cpp',
+    'printers/P700Printer.cpp',
+    'printers/FakePrinter.cpp',
     'graphics/Label.cpp',
     'graphics/Bitmap.cpp',
     'graphics/Monochrome.cpp',

src/printers/FakePrinter.cpp

@@ -0,0 +1,264 @@
+/*
+    ptrnt - print labels on linux
+    Copyright (C) 2023  Moritz Martinius
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+ */
+
+#include "FakePrinter.hpp"
+
+#include <spdlog/spdlog.h>
+#include <cairo.h>
+
+#include <cstdint>
+#include <stdexcept>
+#include <vector>
+#include <chrono>
+#include <iomanip>
+#include <sstream>
+
+#include "../graphics/Monochrome.hpp"
+
+namespace ptprnt::printer {
+
+const PrinterInfo FakePrinter::mInfo = {
+    .driverName = "FakePrinter",
+    .name       = "Virtual Test Printer",
+    .version    = "v1.0",
+    .usbId{0x0000, 0x0000},  // No USB ID - virtual printer created explicitly
+    .pixelLines = 128
+};
+
+const std::string_view FakePrinter::getDriverName() {
+    return mInfo.driverName;
+}
+
+const std::string_view FakePrinter::getName() {
+    return mInfo.name;
+}
+
+const std::string_view FakePrinter::getVersion() {
+    return mInfo.version;
+}
+
+const PrinterInfo FakePrinter::getPrinterInfo() {
+    return mInfo;
+}
+
+const PrinterStatus FakePrinter::getPrinterStatus() {
+    return mStatus;
+}
+
+const libusbwrap::usbId FakePrinter::getUsbId() {
+    return mInfo.usbId;
+}
+
+bool FakePrinter::attachUsbDevice(std::shared_ptr<libusbwrap::IUsbDevice> usbHndl) {
+    // FakePrinter doesn't need a real USB device
+    mHasAttachedDevice = true;
+    spdlog::debug("FakePrinter: Simulated USB device attachment");
+    return true;
+}
+
+bool FakePrinter::detachUsbDevice() {
+    mHasAttachedDevice = false;
+    spdlog::debug("FakePrinter: Simulated USB device detachment");
+    return true;
+}
+
+bool FakePrinter::printBitmap(const graphics::Bitmap<graphics::ALPHA8>& bitmap) {
+    // Convert bitmap to MonochromeData and delegate
+    auto pixels = bitmap.getPixelsCpy();
+    auto mono   = graphics::Monochrome(pixels, bitmap.getWidth(), bitmap.getHeight());
+    auto monoData = mono.get();
+
+    return printMonochromeData(monoData);
+}
+
+bool FakePrinter::printMonochromeData(const graphics::MonochromeData& data) {
+    spdlog::debug("FakePrinter: Simulating printing of {}x{} bitmap", data.width, data.height);
+
+    // Simulate the printing process by reconstructing the bitmap
+    auto printed = simulatePrinting(data);
+    mLastPrint = std::make_unique<graphics::Bitmap<graphics::ALPHA8>>(std::move(printed));
+
+    spdlog::info("FakePrinter: Successfully 'printed' label ({}x{} pixels)",
+                 mLastPrint->getWidth(), mLastPrint->getHeight());
+
+    // Save to timestamped PNG file
+    std::string filename = generateTimestampedFilename();
+    if (saveBitmapToPng(*mLastPrint, filename)) {
+        spdlog::info("FakePrinter: Saved output to {}", filename);
+    } else {
+        spdlog::error("FakePrinter: Failed to save output to {}", filename);
+    }
+
+    return true;
+}
+
+bool FakePrinter::printLabel(const std::unique_ptr<graphics::ILabel> label) {
+    // Convert label directly to MonochromeData
+    // getRaw() returns data in Cairo surface coordinates matching getWidth() × getHeight()
+    auto pixels = label->getRaw();
+
+    // Create monochrome data in landscape orientation (as stored in Cairo surface)
+    auto mono = graphics::Monochrome(pixels, label->getWidth(), label->getHeight(), graphics::Orientation::LANDSCAPE);
+    auto monoData = mono.get();
+
+    // Transform to portrait orientation for printing
+    monoData.transformTo(graphics::Orientation::PORTRAIT);
+
+    spdlog::debug("FakePrinter: Label surface is {}x{}, transformed to portrait", label->getWidth(), label->getHeight());
+
+    return printMonochromeData(monoData);
+}
+
+bool FakePrinter::print() {
+    spdlog::debug("FakePrinter: Print command (no-op for virtual printer)");
+    return true;
+}
+
+graphics::Bitmap<graphics::ALPHA8> FakePrinter::simulatePrinting(const graphics::MonochromeData& data) {
+    spdlog::debug("FakePrinter: Simulating column-by-column printing like real hardware");
+
+    // Create output bitmap with same dimensions
+    graphics::Bitmap<graphics::ALPHA8> result(data.width, data.height);
+    std::vector<uint8_t> pixels(data.width * data.height, 0);
+
+    // Simulate printer behavior: process column by column
+    // This mimics how label printers physically print one vertical line at a time
+    for (uint32_t col = 0; col < data.width; col++) {
+        spdlog::trace("FakePrinter: Processing column {}/{}", col + 1, data.width);
+
+        // Extract column data bit by bit (simulating what would be sent to printer)
+        std::vector<uint8_t> columnBytes;
+
+        for (uint32_t row = 0; row < data.height; row += 8) {
+            uint8_t byte = 0;
+
+            // Pack 8 vertical pixels into one byte (printer data format)
+            for (int bit = 0; bit < 8 && (row + bit) < data.height; bit++) {
+                if (data.getBit(col, row + bit)) {
+                    byte |= (1 << (7 - bit));
+                }
+            }
+
+            columnBytes.push_back(byte);
+        }
+
+        // Now "print" this column by unpacking the bytes back to pixels
+        // This simulates the printer head physically printing this column
+        for (size_t byteIdx = 0; byteIdx < columnBytes.size(); byteIdx++) {
+            uint8_t byte = columnBytes[byteIdx];
+            uint32_t baseRow = byteIdx * 8;
+
+            for (int bit = 0; bit < 8 && (baseRow + bit) < data.height; bit++) {
+                bool pixelOn = (byte & (1 << (7 - bit))) != 0;
+                uint32_t row = baseRow + bit;
+
+                // Write to output bitmap
+                size_t pixelIdx = row * data.width + col;
+                pixels[pixelIdx] = pixelOn ? 255 : 0;  // 255 = black, 0 = white
+            }
+        }
+    }
+
+    // Set the pixels in the result bitmap
+    result.setPixels(pixels);
+
+    spdlog::debug("FakePrinter: Simulation complete, reconstructed {}x{} bitmap",
+                  result.getWidth(), result.getHeight());
+
+    return result;
+}
+
+const graphics::Bitmap<graphics::ALPHA8>& FakePrinter::getLastPrint() const {
+    if (!mLastPrint) {
+        throw std::runtime_error("FakePrinter: No print data available");
+    }
+    return *mLastPrint;
+}
+
+bool FakePrinter::saveLastPrintToPng(const std::string& filename) const {
+    if (!mLastPrint || mLastPrint->getWidth() == 0 || mLastPrint->getHeight() == 0) {
+        spdlog::error("FakePrinter: No print data available to save");
+        return false;
+    }
+
+    return saveBitmapToPng(*mLastPrint, filename);
+}
+
+bool FakePrinter::saveBitmapToPng(const graphics::Bitmap<graphics::ALPHA8>& bitmap, const std::string& filename) const {
+    // Create Cairo surface from bitmap data
+    auto pixels = bitmap.getPixelsCpy();
+    uint16_t width = bitmap.getWidth();
+    uint16_t height = bitmap.getHeight();
+
+    // Cairo expects ARGB32 format, but we have ALPHA8
+    // Convert ALPHA8 (grayscale) to ARGB32
+    std::vector<uint32_t> argbPixels(width * height);
+
+    for (size_t i = 0; i < pixels.size(); i++) {
+        uint8_t gray = pixels[i];
+        // ARGB32 format: 0xAARRGGBB
+        // For grayscale: use gray value for R, G, B and 255 for alpha
+        argbPixels[i] = 0xFF000000 | (gray << 16) | (gray << 8) | gray;
+    }
+
+    // Create Cairo surface
+    int stride = cairo_format_stride_for_width(CAIRO_FORMAT_ARGB32, width);
+    cairo_surface_t* surface = cairo_image_surface_create_for_data(
+        reinterpret_cast<unsigned char*>(argbPixels.data()),
+        CAIRO_FORMAT_ARGB32,
+        width,
+        height,
+        stride
+    );
+
+    if (cairo_surface_status(surface) != CAIRO_STATUS_SUCCESS) {
+        spdlog::error("FakePrinter: Failed to create Cairo surface: {}",
+                      cairo_status_to_string(cairo_surface_status(surface)));
+        cairo_surface_destroy(surface);
+        return false;
+    }
+
+    // Write to PNG file
+    cairo_status_t status = cairo_surface_write_to_png(surface, filename.c_str());
+
+    cairo_surface_destroy(surface);
+
+    if (status != CAIRO_STATUS_SUCCESS) {
+        spdlog::error("FakePrinter: Failed to write PNG file: {}", cairo_status_to_string(status));
+        return false;
+    }
+
+    return true;
+}
+
+std::string FakePrinter::generateTimestampedFilename() const {
+    // Get current time
+    auto now = std::chrono::system_clock::now();
+    auto time = std::chrono::system_clock::to_time_t(now);
+
+    // Format: fakelabel_YYYYMMDD_HHMMSS.png
+    std::stringstream ss;
+    ss << "fakelabel_"
+       << std::put_time(std::localtime(&time), "%Y%m%d_%H%M%S")
+       << ".png";
+
+    return ss.str();
+}
+
+}  // namespace ptprnt::printer

src/printers/FakePrinter.hpp

@@ -0,0 +1,108 @@
+/*
+    ptrnt - print labels on linux
+    Copyright (C) 2023  Moritz Martinius
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+ */
+
+#pragma once
+
+#include <memory>
+#include <vector>
+#include <cstdint>
+
+#include "../interface/IPrinterDriver.hpp"
+#include "../interface/IPrinterTypes.hpp"
+#include "../libusbwrap/LibUsbTypes.hpp"
+#include "../libusbwrap/interface/IUsbDevice.hpp"
+#include "../graphics/Bitmap.hpp"
+
+namespace ptprnt::printer {
+
+/**
+ * @brief Virtual printer driver for testing without hardware
+ *
+ * FakePrinter simulates a real label printer by processing bitmap data
+ * column by column and reconstructing it into a new bitmap, mimicking
+ * the physical printing process of label printers.
+ */
+class FakePrinter : public ::ptprnt::IPrinterDriver {
+   public:
+    FakePrinter() = default;
+    ~FakePrinter() override = default;
+
+    FakePrinter(const FakePrinter&)            = delete;
+    FakePrinter& operator=(const FakePrinter&) = delete;
+    FakePrinter(FakePrinter&&)                 = default;
+    FakePrinter& operator=(FakePrinter&&)      = default;
+
+    // Printer info - static to be accessed without instantiation
+    static const PrinterInfo mInfo;
+
+    // IPrinterDriver interface
+    [[nodiscard]] const std::string_view getDriverName() override;
+    [[nodiscard]] const std::string_view getName() override;
+    [[nodiscard]] const libusbwrap::usbId getUsbId() override;
+    [[nodiscard]] const std::string_view getVersion() override;
+    [[nodiscard]] const PrinterInfo getPrinterInfo() override;
+    [[nodiscard]] const PrinterStatus getPrinterStatus() override;
+    bool attachUsbDevice(std::shared_ptr<libusbwrap::IUsbDevice> usbHndl) override;
+    bool detachUsbDevice() override;
+    bool printBitmap(const graphics::Bitmap<graphics::ALPHA8>& bitmap) override;
+    bool printMonochromeData(const graphics::MonochromeData& data) override;
+    bool printLabel(const std::unique_ptr<graphics::ILabel> label) override;
+    bool print() override;
+
+    /**
+     * @brief Get the last printed bitmap
+     * @return The reconstructed bitmap from simulated printing
+     */
+    [[nodiscard]] const graphics::Bitmap<graphics::ALPHA8>& getLastPrint() const;
+
+    /**
+     * @brief Save the last print to a PNG file
+     * @param filename Path to save the PNG
+     * @return true if successful
+     */
+    bool saveLastPrintToPng(const std::string& filename) const;
+
+   private:
+    /**
+     * @brief Simulate printing by reconstructing bitmap column by column
+     * @param data Monochrome data to "print"
+     * @return Reconstructed bitmap
+     */
+    graphics::Bitmap<graphics::ALPHA8> simulatePrinting(const graphics::MonochromeData& data);
+
+    /**
+     * @brief Save bitmap to PNG file using Cairo
+     * @param bitmap The bitmap to save
+     * @param filename Output filename
+     * @return true if successful
+     */
+    bool saveBitmapToPng(const graphics::Bitmap<graphics::ALPHA8>& bitmap, const std::string& filename) const;
+
+    /**
+     * @brief Generate timestamped filename for fake label output
+     * @return Filename like "fakelabel_20231011_123456.png"
+     */
+    std::string generateTimestampedFilename() const;
+
+    std::unique_ptr<graphics::Bitmap<graphics::ALPHA8>> mLastPrint;
+    bool mHasAttachedDevice = false;
+    PrinterStatus mStatus{.tapeWidthMm = 12};  // Default to 12mm tape
+};
+
+}  // namespace ptprnt::printer

src/printers/P700Printer.cpp

@@ -27,9 +27,9 @@
 #include <thread>
 #include <vector>
 
-#include "graphics/Bitmap.hpp"
-#include "graphics/Monochrome.hpp"
-#include "libusbwrap/LibUsbTypes.hpp"
+#include "../graphics/Bitmap.hpp"
+#include "../graphics/Monochrome.hpp"
+#include "../libusbwrap/LibUsbTypes.hpp"
 #include "spdlog/fmt/bin_to_hex.h"
 
 // as long as DRYRUN is defined, no data is actually send to the printer, we need to save some tape ;)
@@ -121,17 +121,16 @@ bool P700Printer::detachUsbDevice() {
 
 bool P700Printer::printBitmap(const graphics::Bitmap<graphics::ALPHA8>& bitmap) {
     // Convert bitmap to MonochromeData and delegate to printMonochromeData
-    auto pixels = bitmap.getPixelsCpy();
-    auto mono = graphics::Monochrome(pixels, bitmap.getWidth(), bitmap.getHeight());
-    auto monoData = mono.getMonochromeData();
+    auto pixels   = bitmap.getPixelsCpy();
+    auto mono     = graphics::Monochrome(pixels, bitmap.getWidth(), bitmap.getHeight());
+    auto monoData = mono.get();
 
     return printMonochromeData(monoData);
 }
 
 bool P700Printer::printMonochromeData(const graphics::MonochromeData& data) {
 #ifdef DRYRUN
-    spdlog::debug("DRYRUN enabled");
-    data.visualize();
+    spdlog::debug("DRYRUN enabled, printing nothing");
 #endif
 
     send(p700::commands::RASTER_START);
@@ -174,11 +173,19 @@ bool P700Printer::printMonochromeData(const graphics::MonochromeData& data) {
 
 bool P700Printer::printLabel(std::unique_ptr<graphics::ILabel> label) {
     // Convert label directly to MonochromeData
+    // getRaw() returns data in Cairo surface coordinates matching getWidth() × getHeight()
     auto pixels = label->getRaw();
-    auto mono = graphics::Monochrome(pixels, label->getWidth(), label->getHeight());
-    auto monoData = mono.getMonochromeData();
 
-    spdlog::debug("Label has {}x{}px size", label->getWidth(), label->getHeight());
+    // Create monochrome data in landscape orientation (as stored in Cairo surface)
+    auto mono = graphics::Monochrome(pixels, label->getWidth(), label->getHeight(), graphics::Orientation::LANDSCAPE);
+    auto monoData = mono.get();
+
+    // Transform to portrait orientation for printing
+    monoData.transformTo(graphics::Orientation::PORTRAIT);
+
+    spdlog::debug("Label surface is {}x{}, transformed to portrait", label->getWidth(), label->getHeight());
+    monoData.visualize();
+
     return printMonochromeData(monoData);
 }
 

src/printers/P700Printer.hpp

@@ -23,10 +23,10 @@
 #include <memory>
 #include <vector>
 
-#include "interface/IPrinterDriver.hpp"
-#include "interface/IPrinterTypes.hpp"
-#include "libusbwrap/LibUsbTypes.hpp"
-#include "libusbwrap/interface/IUsbDevice.hpp"
+#include "../interface/IPrinterDriver.hpp"
+#include "../interface/IPrinterTypes.hpp"
+#include "../libusbwrap/LibUsbTypes.hpp"
+#include "../libusbwrap/interface/IUsbDevice.hpp"
 
 #pragma once
 

tests/monochrome_test/monochrome_test.cpp

@@ -29,7 +29,7 @@ TEST(basic_test, Monochrome_convertGrayscale_yieldsMonochrome) {
     auto mono = ptprnt::graphics::Monochrome(pixels, 16, 1);
     auto out  = mono.get();
 
-    EXPECT_EQ(out, expected);
+    EXPECT_EQ(out.bytes, expected);
 }
 
 TEST(basic_test, Monochrome_convertInvertedGrayscale_yieldsInvertedMonochrome) {
@@ -41,7 +41,7 @@ TEST(basic_test, Monochrome_convertInvertedGrayscale_yieldsInvertedMonochrome) {
     mono.invert(true);
     auto out = mono.get();
 
-    EXPECT_EQ(out, expected);
+    EXPECT_EQ(out.bytes, expected);
 }
 
 TEST(basic_test, Monochrome_convertWithCustomThreshhold_yieldsMonochromeRespectingThreshhold) {
@@ -53,7 +53,7 @@ TEST(basic_test, Monochrome_convertWithCustomThreshhold_yieldsMonochromeRespecti
     mono.setThreshold(16);
     auto out = mono.get();
 
-    EXPECT_EQ(out, expected);
+    EXPECT_EQ(out.bytes, expected);
 }
 
 TEST(basic_test, Monochrome_convertNonAlignedPixels_spillsOverIntoNewByte) {
@@ -67,14 +67,14 @@ TEST(basic_test, Monochrome_convertNonAlignedPixels_spillsOverIntoNewByte) {
     auto mono = ptprnt::graphics::Monochrome(pixels, 17, 1);
     auto out  = mono.get();
 
-    EXPECT_EQ(out, expected);
+    EXPECT_EQ(out.bytes, expected);
 }
 
 TEST(MonochromeData_test, MonochromeData_getMonochromeData_returnsStructWithCorrectData) {
     const std::vector<uint8_t> pixels({0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00});
 
     auto mono     = ptprnt::graphics::Monochrome(pixels, 8, 1);
-    auto monoData = mono.getMonochromeData();
+    auto monoData = mono.get();
 
     EXPECT_EQ(monoData.bytes.size(), 1);
     EXPECT_EQ(monoData.bytes[0], 0b10101010);
@@ -90,7 +90,7 @@ TEST(MonochromeData_test, MonochromeData2x2_transformToPortrait_rotatesCorrectly
     const std::vector<uint8_t> pixels({0xFF, 0x00, 0x00, 0xFF});
 
     auto mono     = ptprnt::graphics::Monochrome(pixels, 2, 2);
-    auto monoData = mono.getMonochromeData();
+    auto monoData = mono.get();
 
     monoData.transformTo(ptprnt::graphics::Orientation::PORTRAIT);
 
@@ -114,7 +114,7 @@ TEST(MonochromeData_test, MonochromeData3x2_transformToPortrait_rotatesCorrectly
     const std::vector<uint8_t> pixels({0xFF, 0x00, 0x00, 0xFF, 0x00, 0xFF});
 
     auto mono     = ptprnt::graphics::Monochrome(pixels, 3, 2);
-    auto monoData = mono.getMonochromeData();
+    auto monoData = mono.get();
 
     monoData.transformTo(ptprnt::graphics::Orientation::PORTRAIT);
 
@@ -141,7 +141,7 @@ TEST(MonochromeData_test, MonochromeData3x2_transformToPortrait_rotatesCorrectly
     const std::vector<uint8_t> pixels({0xFF, 0x00, 0x00, 0xFF, 0x00, 0xFF});
 
     auto mono     = ptprnt::graphics::Monochrome(pixels, 3, 2);
-    auto monoData = mono.getMonochromeData();
+    auto monoData = mono.get();
 
     monoData.transformTo(ptprnt::graphics::Orientation::PORTRAIT_FLIPPED);