From 0900cc583cc5e51b7c6b378de93cca29e11cb0e9 Mon Sep 17 00:00:00 2001
From: Chris Xiong <chirs241097@gmail.com>
Date: Fri, 28 Oct 2016 16:35:21 +0800
Subject: Add the GLFW port, still using OpenGL 2.1 though. And a more detailed
 readme.

---
 smelt/glfw/CxImage/ximaska.cpp | 126 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 126 insertions(+)
 create mode 100644 smelt/glfw/CxImage/ximaska.cpp

(limited to 'smelt/glfw/CxImage/ximaska.cpp')

diff --git a/smelt/glfw/CxImage/ximaska.cpp b/smelt/glfw/CxImage/ximaska.cpp
new file mode 100644
index 0000000..6f1b1c2
--- /dev/null
+++ b/smelt/glfw/CxImage/ximaska.cpp
@@ -0,0 +1,126 @@
+/*
+ * File:	ximaska.cpp
+ * Purpose:	Platform Independent SKA Image Class Loader and Writer
+ * 25/Sep/2007 Davide Pizzolato - www.xdp.it
+ * CxImage version 7.0.0 31/Dec/2010
+ */
+
+#include "ximaska.h"
+
+#if CXIMAGE_SUPPORT_SKA
+
+////////////////////////////////////////////////////////////////////////////////
+#if CXIMAGE_SUPPORT_DECODE
+////////////////////////////////////////////////////////////////////////////////
+bool CxImageSKA::Decode(CxFile *hFile)
+{
+	if (hFile==NULL)
+		return false;
+
+	// read the  header
+	SKAHEADER ska_header;
+	hFile->Read(&ska_header,sizeof(SKAHEADER),1);
+
+    ska_header.Width = m_ntohs(ska_header.Width);
+    ska_header.Height = m_ntohs(ska_header.Height);
+    ska_header.dwUnknown = m_ntohl(ska_header.dwUnknown);
+
+	// check header
+	if (ska_header.dwUnknown != 0x01000000 ||
+		ska_header.Width > 0x7FFF || ska_header.Height > 0x7FFF ||
+		ska_header.BppExp != 3)
+		return false;
+
+	if (info.nEscape == -1){
+		head.biWidth = ska_header.Width ;
+		head.biHeight= ska_header.Height;
+		info.dwType = CXIMAGE_FORMAT_SKA;
+		return true;
+	}
+
+	int32_t bpp = 1<<ska_header.BppExp;
+
+	Create(ska_header.Width,ska_header.Height,bpp,CXIMAGE_FORMAT_SKA);
+	if (!IsValid())
+		return false;
+
+	// read the palette
+	int32_t nColors = 1<<bpp;
+	rgb_color* ppal = (rgb_color*)malloc(nColors*sizeof(rgb_color));
+	if (!ppal) return false;
+	hFile->Read(ppal,nColors*sizeof(rgb_color),1);
+	SetPalette(ppal,nColors);
+	free(ppal);
+
+	//read the image
+	hFile->Read(GetBits(),ska_header.Width*ska_header.Height,1);
+
+	//reorder rows
+	if (GetEffWidth() != ska_header.Width){
+		uint8_t *src,*dst;
+		src = GetBits() + ska_header.Width*(ska_header.Height-1);
+		dst = GetBits(ska_header.Height-1);
+		for(int32_t y=0;y<ska_header.Height;y++){
+			memcpy(dst,src,ska_header.Width);
+			src -= ska_header.Width;
+			dst -= GetEffWidth();
+		}
+	}
+
+	Flip();
+
+	return true;
+}
+////////////////////////////////////////////////////////////////////////////////
+#endif //CXIMAGE_SUPPORT_DECODE
+////////////////////////////////////////////////////////////////////////////////
+#if CXIMAGE_SUPPORT_ENCODE
+////////////////////////////////////////////////////////////////////////////////
+bool CxImageSKA::Encode(CxFile * hFile)
+{
+	if (EncodeSafeCheck(hFile)) return false;
+
+	if(head.biBitCount > 8)	{
+		strcpy(info.szLastError,"SKA Images must be 8 bit or less");
+		return false;
+	}
+
+	SKAHEADER ska_header;
+
+	ska_header.Width = (uint16_t)GetWidth();
+	ska_header.Height = (uint16_t)GetHeight();
+	ska_header.BppExp = 3;
+	ska_header.dwUnknown = 0x01000000;
+
+    ska_header.Width = m_ntohs(ska_header.Width);
+    ska_header.Height = m_ntohs(ska_header.Height);
+    ska_header.dwUnknown = m_ntohl(ska_header.dwUnknown);
+
+	hFile->Write(&ska_header,sizeof(SKAHEADER),1);
+
+    ska_header.Width = m_ntohs(ska_header.Width);
+    ska_header.Height = m_ntohs(ska_header.Height);
+    ska_header.dwUnknown = m_ntohl(ska_header.dwUnknown);
+
+	if (head.biBitCount<8) IncreaseBpp(8);
+
+	rgb_color pal[256];
+	for(int32_t idx=0; idx<256; idx++){
+		GetPaletteColor(idx,&(pal[idx].r),&(pal[idx].g),&(pal[idx].b));
+	}
+
+	hFile->Write(pal,256*sizeof(rgb_color),1);
+
+	uint8_t* src = GetBits(ska_header.Height-1);
+	for(int32_t y=0;y<ska_header.Height;y++){
+		hFile->Write(src,ska_header.Width,1);
+		src -= GetEffWidth();
+	}
+
+	return true;
+}
+////////////////////////////////////////////////////////////////////////////////
+#endif // CXIMAGE_SUPPORT_ENCODE
+////////////////////////////////////////////////////////////////////////////////
+#endif // CXIMAGE_SUPPORT_SKA
+
-- 
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