* JPEG and PNG support with Lazarus Graphics unit

glBitmap.pas

@@ -252,6 +252,10 @@ unit glBitmap;
 
 
 
+// activate to enable Lazarus TPortableNetworkGraphic support
+// if you enable this pngImage and libPNG will be ignored
+{$DEFINE GLB_LAZ_PNG}
+
 // activate to enable png support with the unit pngimage -> http://pngdelphi.sourceforge.net/
 // if you enable pngimage the libPNG will be ignored
 {.$DEFINE GLB_PNGIMAGE}
@@ -262,6 +266,10 @@ unit glBitmap;
 
 
 
+// activate to enable Lazarus TJPEGImage support
+// if you enable this delphi jpegs and libJPEG will be ignored
+{$DEFINE GLB_LAZ_JPEG}
+
 // if you enable delphi jpegs the libJPEG will be ignored
 {.$DEFINE GLB_DELPHI_JPEG}
 
@@ -306,18 +314,32 @@ unit glBitmap;
     {$MESSAGE warn 'SDL_image won''t work without SDL. SDL will be activated.'}
     {$DEFINE GLB_SDL}
   {$ENDIF}
+
+  {$IFDEF GLB_LAZ_PNG}
+    {$MESSAGE warn 'The Lazarus TPortableNetworkGraphics will be ignored because you are using SDL_image.'}
+    {$undef GLB_LAZ_PNG}
+  {$ENDIF}
+
   {$IFDEF GLB_PNGIMAGE}
     {$MESSAGE warn 'The unit pngimage will be ignored because you are using SDL_image.'}
     {$undef GLB_PNGIMAGE}
   {$ENDIF}
+
+  {$IFDEF GLB_LAZ_JPEG}
+    {$MESSAGE warn 'The Lazarus TJPEGImage will be ignored because you are using SDL_image.'}
+    {$undef GLB_LAZ_JPEG}
+  {$ENDIF}
+
   {$IFDEF GLB_DELPHI_JPEG}
     {$MESSAGE warn 'The unit JPEG will be ignored because you are using SDL_image.'}
     {$undef GLB_DELPHI_JPEG}
   {$ENDIF}
+
   {$IFDEF GLB_LIB_PNG}
     {$MESSAGE warn 'The library libPNG will be ignored because you are using SDL_image.'}
     {$undef GLB_LIB_PNG}
   {$ENDIF}
+
   {$IFDEF GLB_LIB_JPEG}
     {$MESSAGE warn 'The library libJPEG will be ignored because you are using SDL_image.'}
     {$undef GLB_LIB_JPEG}
@@ -327,6 +349,27 @@ unit glBitmap;
   {$DEFINE GLB_SUPPORT_JPEG_READ}
 {$ENDIF}
 
+// Lazarus TPortableNetworkGraphic
+{$IFDEF GLB_LAZ_PNG}
+  {$IFNDEF GLB_LAZARUS}
+    {$MESSAGE warn 'Lazarus TPortableNetworkGraphic won''t work without Lazarus. Lazarus will be activated.'}
+    {$DEFINE GLB_LAZARUS}
+  {$ENDIF}
+
+  {$IFDEF GLB_PNGIMAGE}
+    {$MESSAGE warn 'The pngimage will be ignored if you are using Lazarus TPortableNetworkGraphic.'}
+    {$undef GLB_PNGIMAGE}
+  {$ENDIF}
+
+  {$IFDEF GLB_LIB_PNG}
+    {$MESSAGE warn 'The library libPNG will be ignored if you are using Lazarus TPortableNetworkGraphic.'}
+    {$undef GLB_LIB_PNG}
+  {$ENDIF}
+
+  {$DEFINE GLB_SUPPORT_PNG_READ}
+  {$DEFINE GLB_SUPPORT_PNG_WRITE}
+{$ENDIF}
+
 // PNG Image
 {$IFDEF GLB_PNGIMAGE}
   {$IFDEF GLB_LIB_PNG}
@@ -344,6 +387,27 @@ unit glBitmap;
   {$DEFINE GLB_SUPPORT_PNG_WRITE}
 {$ENDIF}
 
+// Lazarus TJPEGImage
+{$IFDEF GLB_LAZ_JPEG}
+  {$IFNDEF GLB_LAZARUS}
+    {$MESSAGE warn 'Lazarus TJPEGImage won''t work without Lazarus. Lazarus will be activated.'}
+    {$DEFINE GLB_LAZARUS}
+  {$ENDIF}
+
+  {$IFDEF GLB_DELPHI_JPEG}
+    {$MESSAGE warn 'The Delphi JPEGImage will be ignored if you are using the Lazarus TJPEGImage.'}
+    {$undef GLB_DELPHI_JPEG}
+  {$ENDIF}
+
+  {$IFDEF GLB_LIB_JPEG}
+    {$MESSAGE warn 'The library libJPEG will be ignored if you are using the Lazarus TJPEGImage.'}
+    {$undef GLB_LIB_JPEG}
+  {$ENDIF}
+
+  {$DEFINE GLB_SUPPORT_JPEG_READ}
+  {$DEFINE GLB_SUPPORT_JPEG_WRITE}
+{$ENDIF}
+
 // JPEG Image
 {$IFDEF GLB_DELPHI_JPEG}
   {$IFDEF GLB_LIB_JPEG}
@@ -377,19 +441,19 @@ unit glBitmap;
 interface
 
 uses
-  {$IFNDEF GLB_NATIVE_OGL}      dglOpenGL,                {$ENDIF}
+  {$IFNDEF GLB_NATIVE_OGL}      dglOpenGL,                          {$ENDIF}
   {$IF DEFINED(GLB_WIN) AND
-       DEFINED(GLB_NATIVE_OGL)} windows,                  {$IFEND}
+       DEFINED(GLB_NATIVE_OGL)} windows,                            {$IFEND}
 
-  {$IFDEF GLB_SDL}              SDL,                      {$ENDIF}
-  {$IFDEF GLB_LAZARUS}          IntfGraphics, GraphType,  {$ENDIF}
-  {$IFDEF GLB_DELPHI}           Dialogs, Graphics,        {$ENDIF}
+  {$IFDEF GLB_SDL}              SDL,                                {$ENDIF}
+  {$IFDEF GLB_LAZARUS}          IntfGraphics, GraphType, Graphics,  {$ENDIF}
+  {$IFDEF GLB_DELPHI}           Dialogs, Graphics,                  {$ENDIF}
 
-  {$IFDEF GLB_SDL_IMAGE}        SDL_image,                {$ENDIF}
-  {$IFDEF GLB_PNGIMAGE}         pngimage,                 {$ENDIF}
-  {$IFDEF GLB_LIB_PNG}          libPNG,                   {$ENDIF}
-  {$IFDEF GLB_DELPHI_JPEG}      JPEG,                     {$ENDIF}
-  {$IFDEF GLB_LIB_JPEG}         libJPEG,                  {$ENDIF}
+  {$IFDEF GLB_SDL_IMAGE}        SDL_image,                          {$ENDIF}
+  {$IFDEF GLB_PNGIMAGE}         pngimage,                           {$ENDIF}
+  {$IFDEF GLB_LIB_PNG}          libPNG,                             {$ENDIF}
+  {$IFDEF GLB_DELPHI_JPEG}      JPEG,                               {$ENDIF}
+  {$IFDEF GLB_LIB_JPEG}         libJPEG,                            {$ENDIF}
 
   Classes, SysUtils;
 
@@ -5621,11 +5685,45 @@ begin
 end;
 
 {$IFDEF GLB_SUPPORT_PNG_READ}
-{$IF DEFINED(GLB_SDL_IMAGE)}
+{$IF DEFINED(GLB_LAZ_PNG)}
 //////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 //PNG/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 //////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 function TglBitmap.LoadPNG(const aStream: TStream): Boolean;
+var
+  png: TPortableNetworkGraphic;
+  intf: TLazIntfImage;
+  StreamPos: Int64;
+begin
+  result := true;
+  StreamPos := aStream.Position;
+  png := TPortableNetworkGraphic.Create;
+  try try
+    png.LoadFromStream(aStream);
+    intf := png.CreateIntfImage;
+    try try
+      AssignFromLazIntfImage(intf);
+    except
+      result := false;
+      aStream.Position := StreamPos;
+      exit;
+    end;
+    finally
+      intf.Free;
+    end;
+  except
+    result := false;
+    aStream.Position := StreamPos;
+    exit;
+  end;
+  finally
+    png.Free;
+  end;
+end;
+
+{$ELSEIF DEFINED(GLB_SDL_IMAGE)}
+//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+function TglBitmap.LoadPNG(const aStream: TStream): Boolean;
 var
   Surface: PSDL_Surface;
   RWops: PSDL_RWops;
@@ -5866,7 +5964,27 @@ begin
 end;
 {$ENDIF}
 
-{$IF DEFINED(GLB_LIB_PNG)}
+{$IF DEFINED(GLB_LAZ_PNG)}
+//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+procedure TglBitmap.SavePNG(const aStream: TStream);
+var
+  png: TPortableNetworkGraphic;
+  intf: TLazIntfImage;
+begin
+  png  := TPortableNetworkGraphic.Create;
+  intf := TLazIntfImage.Create(0, 0);
+  try
+    if not AssignToLazIntfImage(intf) then
+      raise EglBitmap.Create('unable to create LazIntfImage from glBitmap');
+    png.LoadFromIntfImage(intf);
+    png.SaveToStream(aStream);
+  finally
+    png.Free;
+    intf.Free;
+  end;
+end;
+
+{$ELSEIF DEFINED(GLB_LIB_PNG)}
 //////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 procedure TglBitmap.SavePNG(const aStream: TStream);
 var
@@ -6156,7 +6274,42 @@ end;
 {$ENDIF}
 
 {$IFDEF GLB_SUPPORT_JPEG_READ}
-{$IF DEFINED(GLB_SDL_IMAGE)}
+{$IF DEFINED(GLB_LAZ_JPEG)}
+//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+function TglBitmap.LoadJPEG(const aStream: TStream): Boolean;
+var
+  jpeg: TJPEGImage;
+  intf: TLazIntfImage;
+  StreamPos: Int64;
+begin
+  result := true;
+  StreamPos := aStream.Position;
+  jpeg := TJPEGImage.Create;
+  try try
+    jpeg.LoadFromStream(aStream);
+    intf := TLazIntfImage.Create(0, 0);
+    try try
+      intf.LoadFromBitmap(jpeg.BitmapHandle, jpeg.MaskHandle);
+      AssignFromLazIntfImage(intf);
+    except
+      result := false;
+      aStream.Position := StreamPos;
+      exit;
+    end;
+    finally
+      intf.Free;
+    end;
+  except
+    result := false;
+    aStream.Position := StreamPos;
+    exit;
+  end;
+  finally
+    jpeg.Free;
+  end;
+end;
+
+{$ELSEIF DEFINED(GLB_SDL_IMAGE)}
 //////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 function TglBitmap.LoadJPEG(const aStream: TStream): Boolean;
 var
@@ -6334,7 +6487,27 @@ end;
 {$ENDIF}
 
 {$IFDEF GLB_SUPPORT_JPEG_WRITE}
-{$IF DEFINED(GLB_LIB_JPEG)}
+{$IF DEFINED(GLB_LAZ_JPEG)}
+//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+procedure TglBitmap.SaveJPEG(const aStream: TStream);
+var
+  jpeg: TJPEGImage;
+  intf: TLazIntfImage;
+begin
+  jpeg := TJPEGImage.Create;
+  intf := TLazIntfImage.Create(0, 0);
+  try
+    if not AssignToLazIntfImage(intf) then
+      raise EglBitmap.Create('unable to create LazIntfImage from glBitmap');
+    jpeg.LoadFromIntfImage(intf);
+    jpeg.SaveToStream(aStream);
+  finally
+    intf.Free;
+    jpeg.Free;
+  end;
+end;
+
+{$ELSEIF DEFINED(GLB_LIB_JPEG)}
 //////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 procedure TglBitmap.SaveJPEG(const aStream: TStream);
 var