From ecbecb3fd9069e1610d889ff5d96300cca65615a Mon Sep 17 00:00:00 2001
From: Bergmann89 <bergmann89@muo-game.de>
Date: Sat, 16 Nov 2013 22:42:31 +0100
Subject: [PATCH] * added pngimage Support

---
 glBitmap.pas | 72 +++++++++++++++++++++++++++++++-----------------------------
 1 file changed, 37 insertions(+), 35 deletions(-)

diff --git a/glBitmap.pas b/glBitmap.pas
index 32ee575..f745956 100644
--- a/glBitmap.pas
+++ b/glBitmap.pas
@@ -248,7 +248,7 @@ unit glBitmap;
 // PNG /////////////////////////////////////////////////////////////////////////////////////////////
 // activate to enable png support with the unit pngimage -> http://pngdelphi.sourceforge.net/
 // if you enable pngimage the libPNG will be ignored
-{.$DEFINE GLB_PNGIMAGE}
+{$DEFINE GLB_PNGIMAGE}
 
 // activate to use the libPNG -> http://www.libpng.org/
 // You will need an aditional header -> http://www.opengl24.de/index.php?cat=header&file=libpng
@@ -260,7 +260,7 @@ unit glBitmap;
 
 // activate to use the libJPEG -> http://www.ijg.org/
 // You will need an aditional header -> http://www.opengl24.de/index.php?cat=header&file=libjpeg
-{$DEFINE GLB_LIB_JPEG}
+{.$DEFINE GLB_LIB_JPEG}
 
 
 //////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
@@ -1660,7 +1660,7 @@ var
 //////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 constructor EglBitmapUnsupportedFormat.Create(const aFormat: TglBitmapFormat);
 begin
-  inherited Create(GetEnumName(TypeInfo(TglBitmapFormat), Integer(aFormat)));
+  inherited Create('unsupported format: ' + GetEnumName(TypeInfo(TglBitmapFormat), Integer(aFormat)));
 end;
 
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
@@ -5625,42 +5625,44 @@ function TglBitmap.LoadPNG(const aStream: TStream): Boolean;
 var
   StreamPos: Int64;
   Png: TPNGObject;
-  Header: Array[0..7] of Byte;
+  Header: String[8];
   Row, Col, PixSize, LineSize: Integer;
   NewImage, pSource, pDest, pAlpha: pByte;
-  Format: TglBitmapInternalFormat;
+  PngFormat: TglBitmapFormat;
+  FormatDesc: TFormatDescriptor;
 
 const
-  PngHeader: Array[0..7] of Byte = (#137, #80, #78, #71, #13, #10, #26, #10);
+  PngHeader: String[8] = #137#80#78#71#13#10#26#10;
 
 begin
   result := false;
 
-  StreamPos := Stream.Position;
-  Stream.Read(Header[0], SizeOf(Header));
-  Stream.Position := StreamPos;
+  StreamPos := aStream.Position;
+  aStream.Read(Header[0], SizeOf(Header));
+  aStream.Position := StreamPos;
 
   {Test if the header matches}
   if Header = PngHeader then begin
     Png := TPNGObject.Create;
     try
-      Png.LoadFromStream(Stream);
+      Png.LoadFromStream(aStream);
 
       case Png.Header.ColorType of
         COLOR_GRAYSCALE:
-          Format := ifLuminance;
+          PngFormat := tfLuminance8;
         COLOR_GRAYSCALEALPHA:
-          Format := ifLuminanceAlpha;
+          PngFormat := tfLuminance8Alpha8;
         COLOR_RGB:
-          Format := ifBGR8;
+          PngFormat := tfBGR8;
         COLOR_RGBALPHA:
-          Format := ifBGRA8;
+          PngFormat := tfBGRA8;
         else
           raise EglBitmapException.Create ('LoadPng - Unsupported Colortype found.');
       end;
 
-      PixSize := Trunc(FormatGetSize(Format));
-      LineSize := Integer(Png.Header.Width) * PixSize;
+      FormatDesc := TFormatDescriptor.Get(PngFormat);
+      PixSize    := Round(FormatDesc.PixelSize);
+      LineSize   := FormatDesc.GetSize(Png.Header.Width, 1);
 
       GetMem(NewImage, LineSize * Integer(Png.Header.Height));
       try
@@ -5697,7 +5699,7 @@ begin
             raise EglBitmapException.Create ('LoadPng - Unsupported Colortype found.');
         end;
 
-        SetDataPointer(NewImage, Format, Png.Header.Width, Png.Header.Height);
+        SetDataPointer(NewImage, PngFormat, Png.Header.Width, Png.Header.Height);
 
         result := true;
       except
@@ -5812,32 +5814,32 @@ var
   pTemp: pByte;
   Temp: Byte;
 begin
-  if not (ftPNG in FormatGetSupportedFiles (InternalFormat)) then
-    raise EglBitmapUnsupportedInternalFormat.Create('SavePng - ' + UNSUPPORTED_INTERNAL_FORMAT);
+  if not (ftPNG in FormatGetSupportedFiles (Format)) then
+    raise EglBitmapUnsupportedFormat.Create(Format);
 
-  case FInternalFormat of
-    ifAlpha, ifLuminance, ifDepth8: begin
+  case Format of
+    tfAlpha8, tfLuminance8: begin
       ColorType := COLOR_GRAYSCALE;
-      PixSize := 1;
-      Alpha := false;
+      PixSize   := 1;
+      Alpha     := false;
     end;
-    ifLuminanceAlpha: begin
+    tfLuminance8Alpha8: begin
       ColorType := COLOR_GRAYSCALEALPHA;
-      PixSize := 1;
-      Alpha := true;
+      PixSize   := 1;
+      Alpha     := true;
     end;
-    ifBGR8, ifRGB8: begin
+    tfBGR8, tfRGB8: begin
       ColorType := COLOR_RGB;
-      PixSize := 3;
-      Alpha := false;
+      PixSize   := 3;
+      Alpha     := false;
     end;
-    ifBGRA8, ifRGBA8: begin
+    tfBGRA8, tfRGBA8: begin
       ColorType := COLOR_RGBALPHA;
-      PixSize := 3;
-      Alpha := true
+      PixSize   := 3;
+      Alpha     := true
     end;
   else
-    raise EglBitmapUnsupportedInternalFormat.Create('SavePng - ' + UNSUPPORTED_INTERNAL_FORMAT);
+    raise EglBitmapUnsupportedFormat.Create(Format);
   end;
 
   Png := TPNGObject.CreateBlank(ColorType, 8, Width, Height);
@@ -5857,7 +5859,7 @@ begin
       end;
 
       // convert RGB line to BGR
-      if InternalFormat in [ifRGB8, ifRGBA8] then begin
+      if Format in [tfRGB8, tfRGBA8] then begin
         pTemp := png.ScanLine[Y];
         for X := 0 to Width -1 do begin
           Temp := pByteArray(pTemp)^[0];
@@ -5870,7 +5872,7 @@ begin
 
     // Save to Stream
     Png.CompressionLevel := 6;
-    Png.SaveToStream(Stream);
+    Png.SaveToStream(aStream);
   finally
     FreeAndNil(Png);
   end;
-- 
2.1.4