Got it almost working...

src/graphics/Label.cpp

@@ -22,9 +22,11 @@
 #include <algorithm>
 #include <spdlog/spdlog.h>
 
+#include <cassert>
 #include <cstddef>
 #include <iostream>  // remove me
 #include <string>
+#include <vector>
 
 #include "cairo.h"
 #include "pango/pango-context.h"
@@ -35,67 +37,69 @@
 #include "pango/pangocairo.h"
 
 namespace ptprnt::graphics {
-Label::Label() {
-    /*mSurface         = cairo_image_surface_create(CAIRO_FORMAT_A8, 512, 128);
-    cairo_t* cr      = cairo_create(mSurface);
-    mFontDescription = pango_font_description_new();
-    pango_font_description_set_family(mFontDescription, "sans");
-    pango_font_description_set_weight(mFontDescription, PANGO_WEIGHT_SEMIBOLD);
-    pango_font_description_set_size(mFontDescription, 60 * PANGO_SCALE);
+Label::Label()
+    : mPangoCtx(pango_font_map_create_context(pango_cairo_font_map_get_default())),
+      mPangoLyt(pango_layout_new(mPangoCtx)),
+      mPangoFontDesc(pango_font_description_from_string("Noto sans 32")) {}
 
-    std::string printThis("Mist 💩");
+std::vector<uint8_t> Label::getRaw() {
+    assert(mSurface != nullptr);
+    size_t len = mPrinterHeight * mLayoutWidth;
 
-    mLayout = pango_cairo_create_layout(cr);
-    pango_layout_set_font_description(mLayout, mFontDescription);
-    pango_layout_set_text(mLayout, printThis.c_str(), -1);
-
-    cairo_set_source_rgb(cr, 0.0, 0.0, 0.0);
-    cairo_move_to(cr, 0.0, 94.0);
-    pango_cairo_show_layout_line(cr, pango_layout_get_line(mLayout, 0));
-
-    cairo_surface_write_to_png(mSurface, "hello.png");*/
-}
-
-uint8_t* Label::getRaw() {
     cairo_surface_flush(mSurface);
-    return cairo_image_surface_get_data(mSurface);
+    auto data = cairo_image_surface_get_data(mSurface);
+    return {data, data + len};
 }
 
 uint8_t Label::getNumLines(std::string_view strv) {
     return std::count(strv.begin(), strv.end(), '\n');
 }
 
-void Label::createLabel(const std::string& str) {
+int Label::getLayoutHeight() {
+    return mLayoutHeight;
+}
 
-    // create Pango layout first, to get the render dimensions
-    auto pangoCtx{pango_font_map_create_context(pango_cairo_font_map_get_default())};
-    auto pangoLyt{pango_layout_new(pangoCtx)};
-    auto pangoFontDesc{pango_font_description_from_string("Noto sans 32")};
+int Label::getLayoutWidth() {
+    return mLayoutWidth;
+}
 
-    pango_layout_set_single_paragraph_mode(pangoLyt, true);
-    pango_layout_set_height(pangoLyt, getNumLines(str) * -1);
-    pango_layout_set_alignment(pangoLyt, PANGO_ALIGN_CENTER);
-    pango_layout_set_font_description(pangoLyt, pangoFontDesc);
-    pango_context_load_font(pangoCtx, pangoFontDesc);
-    pango_layout_set_text(pangoLyt, str.c_str(), static_cast<int>(str.length()));
+void Label::create(const std::string& labelText, const uint16_t heightPixel) {
+    mPrinterHeight = heightPixel;
+    pango_layout_set_single_paragraph_mode(mPangoLyt, true);
+    pango_layout_set_height(mPangoLyt, getNumLines(labelText) * -1);
+    pango_layout_set_alignment(mPangoLyt, PANGO_ALIGN_CENTER);
+    pango_layout_set_font_description(mPangoLyt, mPangoFontDesc);
+    pango_context_load_font(mPangoCtx, mPangoFontDesc);
+    pango_layout_set_text(mPangoLyt, labelText.c_str(), static_cast<int>(labelText.length()));
 
-    int width = 0, height = 0;
+    pango_layout_get_size(mPangoLyt, &mLayoutWidth, &mLayoutHeight);
 
-    pango_layout_get_size(pangoLyt, &width, &height);
+    mLayoutWidth /= PANGO_SCALE;
+    mLayoutHeight /= PANGO_SCALE;
 
-    SPDLOG_DEBUG("Layout width: {}, height: {}", width / PANGO_SCALE, height / PANGO_SCALE);
+    SPDLOG_DEBUG("Layout width: {}, height: {}", mLayoutWidth, mLayoutHeight);
 
-    auto surf   = cairo_image_surface_create(CAIRO_FORMAT_A8, width / PANGO_SCALE, 128);
-    cairo_t* cr = cairo_create(surf);
-    pango_cairo_show_layout(cr, pangoLyt);
+    mSurface    = cairo_image_surface_create(CAIRO_FORMAT_A8, mLayoutWidth, mPrinterHeight);
+    cairo_t* cr = cairo_create(mSurface);
+    pango_cairo_show_layout(cr, mPangoLyt);
 
     cairo_set_source_rgb(cr, 0.0, 0.0, 0.0);
+    cairo_surface_flush(mSurface);
+    cairo_destroy(cr);
+}
 
-    // Debug only
-    cairo_surface_write_to_png(surf, "hellow.png");
+void Label::writeToPng(const std::string& file) {
+    if (mSurface) {
+        cairo_surface_flush(mSurface);
+        cairo_surface_write_to_png(mSurface, file.c_str());
+    }
 }
 
 Label::~Label() {
     SPDLOG_DEBUG("Image dtor...");
+    pango_font_description_free(mPangoFontDesc);
+    g_object_unref(mPangoCtx);
+    g_object_unref(mPangoLyt);
+    cairo_surface_destroy(mSurface);
 }
 }  // namespace ptprnt::graphics