Clean process of initialization of style images, do not use manager pointer(could be released)

src/slic3r/GUI/Jobs/CreateFontStyleImagesJob.cpp

@@ -13,9 +13,14 @@ using namespace Slic3r;
 using namespace Slic3r::GUI;
 
 
-CreateFontStyleImagesJob::CreateFontStyleImagesJob(StyleImagesData &&input)
+CreateFontStyleImagesJob::CreateFontStyleImagesJob(
+    FontManager::StyleImagesData &&input)
     : m_input(std::move(input))
-{}
+{
+    assert(m_input.result != nullptr);
+    assert(!m_input.styles.empty());
+    assert(m_input.max_width > 1);
+}
 
 void CreateFontStyleImagesJob::process(Ctl &ctl)
 {    
@@ -24,7 +29,7 @@ void CreateFontStyleImagesJob::process(Ctl &ctl)
     std::vector<double> scales(m_input.styles.size());
     images = std::vector<FontManager::StyleImage>(m_input.styles.size());
 
-    for (StyleImagesData::Item &item : m_input.styles) {
+    for (auto &item : m_input.styles) {
         size_t index = &item - &m_input.styles.front();
         ExPolygons &shapes = name_shapes[index];
         shapes = Emboss::text2shapes(item.font, item.text.c_str(), item.prop);
@@ -124,20 +129,12 @@ void CreateFontStyleImagesJob::finalize(bool canceled, std::exception_ptr &)
 
     // set up texture id
     void *texture_id = (void *) (intptr_t) tex_id;        
-    for (FontManager::StyleImage &image : images) {
+    for (FontManager::StyleImage &image : images)
         image.texture_id = texture_id;
-        size_t index = &image - &images.front();
-        StyleImagesData::Item &style = m_input.styles[index];
         
-        // find manager image and copy to it
-        for (auto& it: m_input.mng->m_font_list) { 
-            if (it.font_item.name != style.text ||
-                !(it.font_item.prop == style.prop))
-                continue;
-            it.image = image;
-            break;
-        }
-    }
+    // move to result
+    m_input.result->styles = std::move(m_input.styles);
+    m_input.result->images = std::move(images);
 
     // bind default texture
     GLuint no_texture_id = 0;

src/slic3r/GUI/Jobs/CreateFontStyleImagesJob.hpp

@@ -9,29 +9,6 @@
 
 namespace Slic3r::GUI {
 
-/// <summary>
-/// Data needed to create Font Style Images
-/// </summary>
-struct StyleImagesData
-{
-    struct Item
-    {
-        Emboss::FontFileWithCache font;
-        std::string               text;
-        FontProp                  prop;
-    };
-    using Items = std::vector<Item>;
-
-    // Keep styles to render
-    Items styles;
-
-    // maximal width in pixels of image
-    int max_width;
-
-    // is used in finalize to set result
-    // and I Can't proof of alive
-    FontManager *mng;
-};
 
 /// <summary>
 /// Create texture with name of styles written by its style
@@ -39,7 +16,7 @@ struct StyleImagesData
 /// </summary>
 class CreateFontStyleImagesJob : public Job
 {
-    StyleImagesData m_input;
+    FontManager::StyleImagesData m_input;
 
     // Output data
     // texture size
@@ -50,7 +27,7 @@ class CreateFontStyleImagesJob : public Job
     std::vector<FontManager::StyleImage> images;
 
 public:
-    CreateFontStyleImagesJob(StyleImagesData &&input);
+    CreateFontStyleImagesJob(FontManager::StyleImagesData &&input);
     void process(Ctl &ctl) override;
     void finalize(bool canceled, std::exception_ptr &) override;
 };

src/slic3r/Utils/FontManager.cpp

@@ -15,6 +15,7 @@ FontManager::FontManager(const ImWchar *language_glyph_range)
     : m_imgui_init_glyph_range(language_glyph_range)
     , m_font_selected(std::numeric_limits<size_t>::max())
     , m_exist_style_images(false)
+    , m_temp_style_images(nullptr)
 {}
 
 FontManager::~FontManager() { 
@@ -382,6 +383,36 @@ void FontManager::init_style_images(int max_width) {
     // check already initialized
     if (m_exist_style_images) return;
 
+    // check is initializing
+    if (m_temp_style_images != nullptr) {
+        // is initialization finished
+        if (!m_temp_style_images->styles.empty()) { 
+            assert(m_temp_style_images->images.size() ==
+                   m_temp_style_images->styles.size());
+            // copy images into styles
+            for (FontManager::StyleImage &image : m_temp_style_images->images){
+                size_t index = &image - &m_temp_style_images->images.front();
+                StyleImagesData::Item &style = m_temp_style_images->styles[index];
+
+                // find style in font list and copy to it
+                for (auto &it : m_font_list) {
+                    if (it.font_item.name != style.text ||
+                        !(it.font_item.prop == style.prop))
+                        continue;
+                    it.image = image;
+                    break;
+                }
+            }
+            m_temp_style_images = nullptr;
+            m_exist_style_images = true;
+            return;
+        }
+        // in process of initialization inside of job
+        return;
+    }
+
+    // create job for init images
+    m_temp_style_images = std::make_shared<StyleImagesData::StyleImages>();
     StyleImagesData::Items styles;
     styles.reserve(m_font_list.size());
     for (Item &item : m_font_list) {
@@ -396,10 +427,8 @@ void FontManager::init_style_images(int max_width) {
     }
 
     auto &worker = wxGetApp().plater()->get_ui_job_worker();
-    StyleImagesData data{styles, max_width, this};
-    queue_job(worker, std::make_unique<CreateFontStyleImagesJob>(std::move(data)));   
-
-    m_exist_style_images = true;
+    StyleImagesData data{std::move(styles), max_width, m_temp_style_images};
+    queue_job(worker, std::make_unique<CreateFontStyleImagesJob>(std::move(data)));
 }
 
 void FontManager::free_style_images() {

src/slic3r/Utils/FontManager.hpp

@@ -17,7 +17,7 @@ namespace Slic3r::GUI {
 /// </summary>
 class FontManager
 {
-    friend class CreateFontStyleImagesJob;
+    friend class CreateFontStyleImagesJob; // access to StyleImagesData
 
 public:
     FontManager(const ImWchar *language_glyph_range);
@@ -196,6 +196,40 @@ private:
     std::vector<Item> m_font_list;
     size_t            m_font_selected; // index to m_font_list
 
+    /// <summary>
+    /// Keep data needed to create Font Style Images in Job
+    /// </summary>
+    struct StyleImagesData
+    {
+        struct Item
+        {
+            Emboss::FontFileWithCache font;
+            std::string               text;
+            FontProp                  prop;
+        };
+        using Items = std::vector<Item>;
+
+        // Keep styles to render
+        Items styles;
+
+        // Maximal width in pixels of image
+        int max_width;
+
+        /// <summary>
+        /// Result of job
+        /// </summary>
+        struct StyleImages
+        {
+            // vector of inputs
+            StyleImagesData::Items styles;
+            // job output
+            std::vector<FontManager::StyleImage> images;
+        };
+
+        // place to store result in main thread in Finalize
+        std::shared_ptr<StyleImages> result;
+    };
+    std::shared_ptr<StyleImagesData::StyleImages> m_temp_style_images;
     bool m_exist_style_images;
 
     // store all font GLImages