Add image handler to Fl_Shared_Image class to support additional file

formats.


git-svn-id: file:///fltk/svn/fltk/branches/branch-1.1@2048 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

CHANGES

@@ -1,3 +1,10 @@
+CHANGES IN FLTK 1.1.0
+
+	- The Fl_Shared_Image class now supports additional
+	  image handling functions - this allows you to support
+	  additional image file formats transparently.
+
+
 CHANGES IN FLTK 1.1.0b12
 
 	- Documentation updates.

FL/Fl_Shared_Image.H

@@ -1,5 +1,5 @@
 //
-// "$Id: Fl_Shared_Image.H,v 1.22.2.2 2002/01/01 15:11:28 easysw Exp $"
+// "$Id: Fl_Shared_Image.H,v 1.22.2.3 2002/03/29 11:59:56 easysw Exp $"
 //
 // Shared image header file for the Fast Light Tool Kit (FLTK).
 //
@@ -29,6 +29,10 @@
 #  include "Fl_Image.H"
 
 
+// Test function for adding new formats
+typedef Fl_Image *(*Fl_Shared_Handler)(const char *name, uchar *header,
+                                       int headerlen);
+
 // Shared images class. 
 class Fl_Shared_Image : public Fl_Image {
   protected:
@@ -36,6 +40,9 @@ class Fl_Shared_Image : public Fl_Image {
   static Fl_Shared_Image **images_;	// Shared images
   static int	num_images_;		// Number of shared images
   static int	alloc_images_;		// Allocated shared images
+  static Fl_Shared_Handler **handlers_;	// Additional format handlers
+  static int	num_handlers_;		// Number of format handlers
+  static int	alloc_handlers_;	// Allocated format handlers
 
   const char	*name_;			// Name of image file
   int		original_;		// Original image?
@@ -70,10 +77,12 @@ class Fl_Shared_Image : public Fl_Image {
   static Fl_Shared_Image *get(const char *n, int W = 0, int H = 0);
   static Fl_Shared_Image **images() { return images_; }
   static int		num_images() { return num_images_; }
+  static void		add_handler(Fl_Shared_Handler *f);
+  static void		remove_handler(Fl_Shared_Handler *f);
 };
 
 #endif // !Fl_Shared_Image_H
 
 //
-// End of "$Id: Fl_Shared_Image.H,v 1.22.2.2 2002/01/01 15:11:28 easysw Exp $"
+// End of "$Id: Fl_Shared_Image.H,v 1.22.2.3 2002/03/29 11:59:56 easysw Exp $"
 //

src/Fl_Shared_Image.cxx

@@ -1,5 +1,5 @@
 //
-// "$Id: Fl_Shared_Image.cxx,v 1.23.2.7 2002/01/06 17:51:12 easysw Exp $"
+// "$Id: Fl_Shared_Image.cxx,v 1.23.2.8 2002/03/29 11:59:56 easysw Exp $"
 //
 // Shared image code for the Fast Light Tool Kit (FLTK).
 //
@@ -46,6 +46,10 @@ Fl_Shared_Image **Fl_Shared_Image::images_ = 0;	// Shared images
 int	Fl_Shared_Image::num_images_ = 0;	// Number of shared images
 int	Fl_Shared_Image::alloc_images_ = 0;	// Allocated shared images
 
+Fl_Shared_Handler **Fl_Shared_Image::handlers_;	// Additional format handlers
+int	Fl_Shared_Image::num_handlers_;		// Number of format handlers
+int	Fl_Shared_Image::alloc_handlers_;	// Allocated format handlers
+
 
 //
 // Typedef the C API sort function type the only way I know how...
@@ -204,6 +208,7 @@ Fl_Shared_Image::release() {
 void
 Fl_Shared_Image::reload() {
   // Load image from disk...
+  int		i;		// Looping var
   FILE		*fp;		// File pointer
   uchar		header[16];	// Buffer for auto-detecting files
   Fl_Image	*img;		// New image
@@ -234,8 +239,14 @@ Fl_Shared_Image::reload() {
     img = new Fl_XBM_Image(name_);
   else if (memcmp(header, "/* XPM */", 9) == 0) // XPM file
     img = new Fl_XPM_Image(name_);
-  else
-    img = 0;
+  else {
+    // Not a standard format; try an image handler...
+    for (i = 0, img = 0; i < num_handlers_; i ++) {
+      img = (*(handlers_[i]))(name_, header, sizeof(header));
+
+      if (img) break;
+    }
+  }
 
   if (img) {
     if (alloc_image_) delete image_;
@@ -385,5 +396,64 @@ Fl_Shared_Image::get(const char *n, int W, int H) {
 
 
 //
-// End of "$Id: Fl_Shared_Image.cxx,v 1.23.2.7 2002/01/06 17:51:12 easysw Exp $".
+// 'Fl_Shared_Image::add_handler()' - Add a shared image handler.
+//
+
+void
+Fl_Shared_Image::add_handler(Fl_Shared_Handler *f) {
+  int			i;		// Looping var...
+  Fl_Shared_Handler	**temp;		// New image handler array...
+
+  // First see if we have already added the handler...
+  for (i = 0; i < num_handlers_; i ++) {
+    if (handlers_[i] == f) return;
+  }
+
+  if (num_handlers_ >= alloc_handlers_) {
+    // Allocate more memory...
+    temp = new Fl_Shared_Handler *[alloc_handlers_ + 32];
+
+    if (alloc_handlers_) {
+      memcpy(temp, handlers_, alloc_handlers_ * sizeof(Fl_Shared_Handler *));
+
+      delete[] handlers_;
+    }
+
+    handlers_       = temp;
+    alloc_handlers_ += 32;
+  }
+
+  handlers_[num_handlers_] = f;
+  num_handlers_ ++;
+}
+
+
+//
+// 'Fl_Shared_Image::remove_handler()' - Remove a shared image handler.
+//
+
+void
+Fl_Shared_Image::remove_handler(Fl_Shared_Handler *f) {
+  int	i;				// Looping var...
+
+  // First see if the handler has been added...
+  for (i = 0; i < num_handlers_; i ++) {
+    if (handlers_[i] == f) break;
+  }
+
+  if (i >= num_handlers_) return;
+
+  // OK, remove the handler from the array...
+  num_handlers_ --;
+
+  if (i < num_handlers_) {
+    // Shift later handlers down 1...
+    memcpy(handlers_ + i, handlers_ + i + 1,
+           (num_handlers_ - i) * sizeof(Fl_Shared_Handler *));
+  }
+}
+
+
+//
+// End of "$Id: Fl_Shared_Image.cxx,v 1.23.2.8 2002/03/29 11:59:56 easysw Exp $".
 //