but why

src/gui/gui.cpp

@@ -5446,7 +5446,11 @@ bool FurnaceGUI::init() {
   // get the icon (on macOS and Windows the icon is bundled with the app)
   const FurnaceGUIImage* furIcon=getImage(GUI_IMAGE_ICON);
   SDL_Surface* icon=NULL;
-  if (furIcon!=NULL) SDL_CreateRGBSurfaceFrom(furIcon->data,furIcon->width,furIcon->height,32,256*4,0xff,0xff00,0xff0000,0xff000000);
+  if (furIcon!=NULL) {
+    SDL_CreateRGBSurfaceFrom(furIcon->data,furIcon->width,furIcon->height,32,256*4,0xff,0xff00,0xff0000,0xff000000);
+  } else {
+    logE("furIcon is NULL!");
+  }
 #endif
 
 #ifdef IS_MOBILE

src/gui/gui.h

@@ -1103,9 +1103,12 @@ struct FurnaceGUIQueryResult {
 
 struct FurnaceGUIImage {
   unsigned char* data;
+  SDL_Texture* tex;
   int width, height, ch;
+
   FurnaceGUIImage():
    data(NULL),
+   tex(NULL),
    width(0),
    height(0),
    ch(0) {}
@@ -1873,7 +1876,8 @@ class FurnaceGUI {
   void pushToggleColors(bool status);
   void popToggleColors();
 
-  const FurnaceGUIImage* getImage(FurnaceGUIImages image);
+  FurnaceGUIImage* getImage(FurnaceGUIImages image);
+  SDL_Texture* getTexture(FurnaceGUIImages image);
 
   void drawMobileControls();
   void drawMobileOrderSel();

src/gui/image.cpp

@@ -37,7 +37,29 @@ const unsigned int imageLen[GUI_IMAGE_MAX]={
   image_icon_size
 };
 
-const FurnaceGUIImage* FurnaceGUI::getImage(FurnaceGUIImages image) {
+SDL_Texture* FurnaceGUI::getTexture(FurnaceGUIImages image) {
+  FurnaceGUIImage* img=getImage(image);
+
+  if (img==NULL) return NULL;
+  if (img->data==NULL) return NULL;
+  if (img->width<=0 || img->height<=0) return NULL;
+
+  if (img->tex==NULL) {
+    img->tex=SDL_CreateTexture(sdlRend,SDL_PIXELFORMAT_ABGR8888,SDL_TEXTUREACCESS_STATIC,img->width,img->height);
+    if (img->tex==NULL) {
+      logE("error while creating image %d texture! %s",(int)image,SDL_GetError());
+      return NULL;
+    }
+
+    if (SDL_UpdateTexture(img->tex,NULL,img->data,img->width*4)!=0) {
+      logE("error while updating texture of image %d! %s",(int)image,SDL_GetError());
+    }
+  }
+
+  return img->tex;
+}
+
+FurnaceGUIImage* FurnaceGUI::getImage(FurnaceGUIImages image) {
   FurnaceGUIImage* ret=NULL;
   auto retPos=images.find(image);
   if (retPos!=images.cend()) {

src/gui/intro.cpp

@@ -36,6 +36,13 @@ void FurnaceGUI::drawIntro() {
 
       dl->AddRectFilled(top,bottom,bgColor);
       dl->AddText(top,0xffffffff,"Furnace intro");
+
+      SDL_Texture* icon=getTexture(GUI_IMAGE_ICON);
+      if (icon!=NULL) {
+        dl->AddImage(icon,ImVec2(introPos*100,40),ImVec2(256+introPos*100,40+256));
+      } else {
+
+      }
     }
     ImGui::End();
   }