[layers] Implemented layer insertion. No keys or menu yet, but it's already used when loading images, to make an image with right number of layers. Undoing/redoing such change works. Implemented single-layer deletion (untested)

git-svn-id: svn://pulkomandy.tk/GrafX2/branches/layers@1069 416bcca6-2ee7-4201-b75f-2eb2f807beb1

buttons.c

@@ -1365,7 +1365,7 @@ void Button_Page(void)
   SWAP_WORDS (Main_fileselector_position,Spare_fileselector_position)
   SWAP_WORDS (Main_fileselector_offset,Spare_fileselector_offset)
   SWAP_SHORTS(Main_current_layer,Spare_current_layer)
-  SWAP_BYTES (Main_layers_visible,Spare_layers_visible)
+  SWAP_WORDS (Main_layers_visible,Spare_layers_visible)
 
   // A la fin, on affiche l'écran
   for (factor_index=0; ZOOM_FACTOR[factor_index]!=Main_magnifier_factor; factor_index++);
@@ -4285,7 +4285,7 @@ void Transparency_set(byte amount)
 
 void Layer_activate(short layer, short side)
 {
-  byte old_layers;
+  word old_layers;
 
   if (layer >= Main_backups->Pages->Nb_layers)
     return;
@@ -4300,7 +4300,7 @@ void Layer_activate(short layer, short side)
       if (Main_layers_visible == (1<<layer))
       {
         // Set all layers visible
-        Main_layers_visible = 0xFF;
+        Main_layers_visible = 0xFFFF;
       }
       else
       {

global.h

@@ -348,7 +348,7 @@ GFX2_GLOBAL short Main_magnifier_offset_Y;
 /// Index of layer currently being edited
 GFX2_GLOBAL int Main_current_layer;
 /// Bitfield that records which layers are visible. 2^0 for 0, 2^1 for 1, 2^2 for 2, etc.
-GFX2_GLOBAL byte Main_layers_visible;
+GFX2_GLOBAL word Main_layers_visible;
 
 // -- Spare page data
 
@@ -412,7 +412,7 @@ GFX2_GLOBAL short Spare_magnifier_offset_Y;
 /// Index of layer currently being edited
 GFX2_GLOBAL short Spare_current_layer;
 /// Bitfield that records which layers are visible. 2^0 for 0, 2^1 for 1, 2^2 for 2, etc.
-GFX2_GLOBAL byte Spare_layers_visible;
+GFX2_GLOBAL word Spare_layers_visible;
 // -- Image backups
 
 /// Backup of the current screen, used during drawing when FX feedback is OFF.

graph.c

@@ -595,7 +595,7 @@ void Resize_image(word chosen_width,word chosen_height)
   // |B| |    C   = Nouvelle image
   // +-+-+
 
-  if (Backup_with_new_dimensions(1,chosen_width,chosen_height))
+  if (Backup_with_new_dimensions(1,Main_backups->Pages->Nb_layers,chosen_width,chosen_height))
   {
     // La nouvelle page a pu être allouée, elle est pour l'instant pleine de
     // 0s. Elle fait Main_image_width de large.

loadsave.c

@@ -460,7 +460,7 @@ void Init_preview(short width,short height,long size,int format, enum PIXEL_RATI
   {
     if (Pixel_load_function==Pixel_load_in_current_screen)
     {
-      if (Backup_with_new_dimensions(0,width,height))
+      if (Backup_with_new_dimensions(0,1,width,height))
       {
         // La nouvelle page a pu être allouée, elle est pour l'instant pleine
         // de 0s. Elle fait Main_image_width de large.
@@ -3174,6 +3174,7 @@ void Load_GIF(void)
               if (number_LID!=0)
               {
                 Main_current_layer++;
+                Add_layer(Main_backups, Main_current_layer);
               }
               number_LID++;
               

main.c

@@ -370,9 +370,9 @@ int Init_program(int argc,char * argv[])
   Main_fileselector_offset=0; // Au début, le fileselect est en haut de la liste des fichiers
   Main_format=0;
   Main_current_layer=0;
-  Main_layers_visible=0xFF;
+  Main_layers_visible=0xFFFF;
   Spare_current_layer=0;
-  Spare_layers_visible=0xFF;
+  Spare_layers_visible=0xFFFF;
   
   Spare_fileselector_position=0;
   Spare_fileselector_offset=0;

pages.c

@@ -43,7 +43,7 @@ T_Page * New_page(byte nb_layers)
 {
   T_Page * page;
   
-  page = (T_Page *)malloc(sizeof(T_Page)+NB_LAYERS*sizeof(byte *));
+  page = (T_Page *)malloc(sizeof(T_Page)+nb_layers*sizeof(byte *));
   if (page!=NULL)
   {
     int i;
@@ -469,7 +469,7 @@ void Free_last_page_of_list(T_List_of_pages * list)
 }
 
 // layer_mask tells which layers have to be fresh copies instead of references
-int Create_new_page(T_Page * new_page,T_List_of_pages * list, byte layer_mask)
+int Create_new_page(T_Page * new_page, T_List_of_pages * list, word layer_mask)
 {
 
 //   Cette fonction crée une nouvelle page dont les attributs correspondent à
@@ -659,13 +659,12 @@ void Set_number_of_backups(int nb_backups)
   // (nb_backups = Nombre de backups, sans compter les pages courantes)
 }
 
-int Backup_with_new_dimensions(int upload,int width,int height)
+int Backup_with_new_dimensions(int upload,byte layers,int width,int height)
 {
   // Retourne 1 si une nouvelle page est disponible (alors pleine de 0) et
   // 0 sinon.
 
   T_Page * new_page;
-  byte nb_layers;
   int return_code=0;
   int i;
 
@@ -674,9 +673,8 @@ int Backup_with_new_dimensions(int upload,int width,int height)
     // retrouver plus tard)
     Upload_infos_page_main(Main_backups->Pages);
 
-  nb_layers=Main_backups->Pages->Nb_layers;
   // On crée un descripteur pour la nouvelle page courante
-  new_page=New_page(nb_layers);
+  new_page=New_page(layers);
   if (!new_page)
   {
     Error(0);
@@ -685,9 +683,9 @@ int Backup_with_new_dimensions(int upload,int width,int height)
   Upload_infos_page_main(new_page);
   new_page->Width=width;
   new_page->Height=height;
-  if (Create_new_page(new_page,Main_backups,255))
+  if (Create_new_page(new_page,Main_backups,0xFFFF))
   {
-    for (i=0; i<nb_layers;i++)
+    for (i=0; i<layers;i++)
     {
       memset(Main_backups->Pages->Image[i], 0, width*height);
     }
@@ -727,7 +725,7 @@ int Backup_and_resize_the_spare(int width,int height)
   Upload_infos_page_spare(new_page);
   new_page->Width=width;
   new_page->Height=height;
-  if (Create_new_page(new_page,Spare_backups,255))
+  if (Create_new_page(new_page,Spare_backups,0xFFFF))
   {
     byte i;
     
@@ -752,10 +750,9 @@ void Backup(void)
   Backup_layers(1<<Main_current_layer);
 }
 
-void Backup_layers(byte layer_mask)
+void Backup_layers(word layer_mask)
 {
-    int i;
-  
+  int i;
   T_Page *new_page;
 
   /*
@@ -922,3 +919,150 @@ void End_of_modification(void)
   Backup();
   */
 }
+
+/// Add a new layer to latest page of a list. Returns 0 on success.
+byte Add_layer(T_List_of_pages *list, byte layer)
+{
+  T_Page * source_page;
+  T_Page * new_page;
+  byte * new_image;
+  int i;
+  
+  source_page = list->Pages;
+   
+  // Keep the position reasonable
+  if (layer > list->Pages->Nb_layers)
+    layer = list->Pages->Nb_layers;
+   
+  // Allocate the pixel data
+  new_image = New_layer(list->Pages->Height*list->Pages->Width);
+  if (! new_image)
+  {
+    Error(0);
+    return 1;
+  }
+  // Re-allocate the page itself, with room for one more pointer
+  new_page = realloc(source_page, sizeof(T_Page)+(list->Pages->Nb_layers+1)*sizeof(byte *));
+  if (!new_page)
+  {
+    Error(0);
+    return 1;
+  }
+  if (new_page != source_page)
+  {
+    // Need some housekeeping because the page moved in memory.
+    // Update all pointers that pointed to it:
+    new_page->Prev->Next = new_page;
+    new_page->Next->Prev = new_page;
+    list->Pages = new_page;
+  }
+  list->Pages->Nb_layers++;
+  // Move around the pointers. This part is going to be tricky when we
+  // have 'animations x layers' in this vector.
+  for (i=list->Pages->Nb_layers-1; i>layer ; i--)
+  {
+    new_page->Image[i]=new_page->Image[i-1];
+  }
+  new_page->Image[layer]=new_image;
+  // Fill with transparency, initially
+  memset(new_image, 0, list->Pages->Height*list->Pages->Width); // transparent color
+  
+  // Done. Note that the visible buffer is already ok since we
+  // only inserted a transparent "slide" somewhere.
+  // The depth buffer is all wrong though.
+
+  // Update the flags of visible layers. 
+  {
+    word layers_before;
+    word layers_after;
+    word *visible_layers_flag;
+    
+    // Determine if we're modifying the spare or the main page.
+    if (list == Main_backups)
+    {
+      visible_layers_flag = &Main_layers_visible;
+      Main_current_layer = layer;
+    }
+    else
+    {
+      visible_layers_flag = &Spare_layers_visible;
+      Spare_current_layer = layer;
+    }
+    
+    // Fun with binary!
+    layers_before = ((1<<layer)-1) & *visible_layers_flag;
+    layers_after = (*visible_layers_flag & (!layers_before))<<1;
+    *visible_layers_flag = (1<<layer) | layers_before | layers_after;
+  }
+  
+  // All ok
+  return 0;
+}
+
+/// Delete a layer from the latest page of a list. Returns 0 on success.
+byte Delete_layer(T_List_of_pages *list, byte layer)
+{
+  T_Page * page;
+  int i;
+  
+  page = list->Pages;
+   
+  // Keep the position reasonable
+  if (layer >= list->Pages->Nb_layers)
+    layer = list->Pages->Nb_layers - 1;
+  if (list->Pages->Nb_layers == 1)
+    return 1;
+   
+  // For simplicity, we won't actually shrink the page in terms of allocation.
+  // It would only save the size of a pointer, and anyway, as the user draws,
+  // this page is going to fall off the end of the Undo-list
+  // and so it will be cleared anyway.
+  
+  // Smart freeing of the pixel data
+  Free_layer(list->Pages->Image[layer]);
+  
+  list->Pages->Nb_layers--;
+  // Move around the pointers. This part is going to be tricky when we
+  // have 'animations x layers' in this vector.
+  for (i=layer; i < list->Pages->Nb_layers; i++)
+  {
+    list->Pages->Image[i]=list->Pages->Image[i+1];
+  }
+  
+  // Done. At this point the visible buffer and the depth buffer are
+  // all wrong.
+
+  // Update the flags of visible layers. 
+  {
+    word layers_before;
+    word layers_after;
+    word *visible_layers_flag;
+    byte new_current_layer;
+    
+    // Determine if we're modifying the spare or the main page.
+    if (list == Main_backups)
+    {
+      visible_layers_flag = &Main_layers_visible;
+      if (Main_current_layer>=layer && Main_current_layer>0)
+        Main_current_layer--;
+      new_current_layer = Main_current_layer;
+    }
+    else
+    {
+      visible_layers_flag = &Spare_layers_visible;
+      if (Spare_current_layer>=layer && Spare_current_layer>0)
+        Spare_current_layer--;
+      new_current_layer = Spare_current_layer;
+    }
+    
+    // Fun with binary!
+    layers_before = ((1<<layer)-1) & *visible_layers_flag;
+    layers_after = (*visible_layers_flag & (!layers_before))>>1;
+    *visible_layers_flag = layers_before | layers_after;
+    // Ensure the current layer is part what is shown.
+    *visible_layers_flag |= 1<<new_current_layer;
+  }
+  
+  // All ok
+  return 0;
+}

pages.h

@@ -37,6 +37,10 @@
 
 void Download_infos_page_main(T_Page * page);
 void Upload_infos_page_main(T_Page * page);
+/// Add a new layer to latest page of a list. Returns 0 on success.
+byte Add_layer(T_List_of_pages *list, byte layer);
+/// Delete a layer from the latest page of a list. Returns 0 on success.
+byte Delete_layer(T_List_of_pages *list, byte layer);
 
 // private
 T_Page * New_page(byte nb_layers);
@@ -58,7 +62,7 @@ int Allocate_list_of_pages(T_List_of_pages * list);
 void Backward_in_list_of_pages(T_List_of_pages * list);
 void Advance_in_list_of_pages(T_List_of_pages * list);
 void Free_last_page_of_list(T_List_of_pages * list);
-int Create_new_page(T_Page * new_page,T_List_of_pages * current_list, byte layer_mask);
+int Create_new_page(T_Page * new_page,T_List_of_pages * current_list, word layer_mask);
 void Change_page_number_of_list(T_List_of_pages * list,int number);
 void Free_page_of_a_list(T_List_of_pages * list);
 
@@ -70,12 +74,12 @@ void Free_page_of_a_list(T_List_of_pages * list);
 
 int Init_all_backup_lists(int width,int height);
 void Set_number_of_backups(int nb_backups);
-int Backup_with_new_dimensions(int upload,int width,int height);
+int Backup_with_new_dimensions(int upload,byte layers,int width,int height);
 int Backup_and_resize_the_spare(int width,int height);
 /// Backup with a new copy for the working layer, and references for all others.
 void Backup(void);
 /// Backup with a new copy of some layers (the others are references).
-void Backup_layers(byte layer_mask);
+void Backup_layers(word layer_mask);
 void Undo(void);
 void Redo(void);
 void Free_current_page(void); // 'Kill' button

transform.c

@@ -368,7 +368,7 @@ void Button_Transform_menu(void)
     old_height=Main_image_height;
     
     // Allocate a new page
-    if (Backup_with_new_dimensions(1,new_width,new_height))
+    if (Backup_with_new_dimensions(1,Main_backups->Pages->Nb_layers,new_width,new_height))
     {
       // The new image is allocated, the new dimensions are already updated.