A somewhat working state, but still struggeling with pangocairo

src/PtouchPrint.cpp

@@ -39,6 +39,7 @@
 #include "CLI/Option.hpp"
 #include "P700Printer.hpp"
 #include "graphics/Bitmap.hpp"
+#include "graphics/Image.hpp"
 #include "libusbwrap/UsbDeviceFactory.hpp"
 
 namespace ptprnt {
@@ -98,6 +99,10 @@ int PtouchPrint::run() {
 
     for (auto& cmd : mCommands) {
         spdlog::debug("Command: {}", cmd.second);
+        if (cmd.first == CliCmdType::Text) {
+            auto label{graphics::Image()};
+            label.createLabel(cmd.second);
+        }
     }
 
     return 0;

src/graphics/Image.cpp

@@ -19,13 +19,23 @@
 
 #include "Image.hpp"
 
+#include <algorithm>
+#include <spdlog/spdlog.h>
+
+#include <cstddef>
+#include <iostream>  // remove me
 #include <string>
 
+#include "cairo.h"
+#include "pango/pango-context.h"
 #include "pango/pango-font.h"
+#include "pango/pango-layout.h"
+#include "pango/pango-types.h"
+#include "pango/pangocairo.h"
 
 namespace ptprnt::graphics {
 Image::Image() {
-    mSurface         = cairo_image_surface_create(CAIRO_FORMAT_A8, 512, 128);
+    /*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");
@@ -42,7 +52,7 @@ Image::Image() {
     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");
+    cairo_surface_write_to_png(mSurface, "hello.png");*/
 }
 
 uint8_t* Image::getRaw() {
@@ -50,8 +60,46 @@ uint8_t* Image::getRaw() {
     return cairo_image_surface_get_data(mSurface);
 }
 
+uint8_t Image::getNumLines(std::string_view strv) {
+    return std::count(strv.begin(), strv.end(), '\n');
+}
+
+void Image::createLabel(const std::string& str) {
+    // create Pango layout first, to get the render dimensions
+    mSurface    = cairo_image_surface_create(CAIRO_FORMAT_A8, 512, 128);
+    cairo_t* cr = cairo_create(mSurface);
+    //auto pangoCtx{pango_context_new()};
+    auto pangoLyt{pango_cairo_create_layout(cr)};
+    auto pangoFontDesc{pango_font_description_from_string("FreeSans 32")};
+
+    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_layout_set_text(pangoLyt, str.c_str(), static_cast<int>(str.length()));
+
+    // Debug only
+    GError* gerr{nullptr};
+    pango_layout_write_to_file(pangoLyt, PANGO_LAYOUT_SERIALIZE_DEFAULT, "hello.txt", &gerr);
+
+    // create Cairo surface from p ango layout
+    int* width{};
+    int* height{};  // TODO: change me, fixed for current printer (128px)
+    PangoRectangle* rect{};
+
+    pango_cairo_show_layout(cr, pangoLyt);
+    pango_layout_get_extents(pangoLyt, rect, rect);
+    std::cerr << "Width is: " << rect->width << " height is:" << rect->height << std::endl;
+
+    //auto cairoSfc{cairo_image_surface_create(CAIRO_FORMAT_A8, *width, *height)};
+
+    cairo_set_source_rgb(cr, 0.0, 0.0, 0.0);
+
+    // Debug only
+    cairo_surface_write_to_png(mSurface, "hellow.png");
+}
+
 Image::~Image() {
-    g_object_unref(mLayout);
-    pango_font_description_free(mFontDescription);
+    spdlog::info("Image dtor...");
 }
 }  // namespace ptprnt::graphics

src/graphics/Image.hpp

@@ -22,15 +22,30 @@
 #include <pango/pangocairo.h>
 
 #include <cstdint>
+#include <string>
 
 namespace ptprnt::graphics {
+
+constexpr const char* DEFAULT_FONT_FAMILY = "sans";
+constexpr const uint8_t DEFAULT_FONT_SIZE = 32;
+
 class Image {
    public:
     Image();
     ~Image();
+
+    Image(const Image&)            = delete;
+    Image& operator=(const Image&) = delete;
+    Image(Image&&)                 = delete;
+    Image& operator=(Image&&)      = delete;
+
     uint8_t* getRaw();
+    void createLabel(const std::string& labelText);
 
    private:
+    // methods
+    uint8_t getNumLines(std::string_view str);
+    // members
     PangoLayout* mLayout;
     PangoFontDescription* mFontDescription;
     cairo_surface_t* mSurface;