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libs/IO/ImageSCI.cpp

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+////////////////////////////////////////////////////////////////////
+// ImageSCI.cpp
+//
+// Copyright 2007 cDc@seacave
+// Distributed under the Boost Software License, Version 1.0
+// (See http://www.boost.org/LICENSE_1_0.txt)
+
+#include "Common.h"
+#include "ImageSCI.h"
+
+using namespace SEACAVE;
+
+
+// D E F I N E S ///////////////////////////////////////////////////
+
+#define IMAGE_SCI_TYPE		0x494353	//"SCI" = 3 bytes
+#define IMAGE_SCI_VERSION	1			//1 byte
+#define IMAGE_SCI_HEADER	((DWORD)((((DWORD)IMAGE_SCI_VERSION)<<24)|(DWORD)IMAGE_SCI_TYPE))	//"SCI"+ver = 4 bytes
+
+
+// S T R U C T S ///////////////////////////////////////////////////
+
+typedef struct SCIINFOHEADER_TYPE {
+	uint32_t dwHeader;
+	uint16_t shWidth;
+	uint16_t shHeight;
+	uint8_t  byFormat;
+	uint8_t  byLevels;
+	uint8_t  byReserved1;
+	uint8_t  byReserved2;
+} SCIINFOHEADER;
+
+
+CImageSCI::CImageSCI()
+{
+} // Constructor
+
+CImageSCI::~CImageSCI()
+{
+} // Destructor
+/*----------------------------------------------------------------*/
+
+
+HRESULT CImageSCI::ReadHeader()
+{
+	// read header
+	((ISTREAM*)m_pStream)->setPos(0);
+	SCIINFOHEADER sciInfo;
+	m_pStream->read(&sciInfo, sizeof(SCIINFOHEADER));
+	if (sciInfo.dwHeader != IMAGE_SCI_HEADER) {
+		LOG(LT_IMAGE, "error: invalid SCI image");
+		return _INVALIDFILE;
+	}
+	m_width = sciInfo.shWidth;
+	m_height = sciInfo.shHeight;
+	m_numLevels = sciInfo.byLevels;
+	m_level = 0;
+	m_format = (PIXELFORMAT)sciInfo.byFormat;
+	m_stride = GetStride(m_format);
+	m_lineWidth = GetDataSizes(0, m_dataWidth, m_dataHeight);
+	return _OK;
+} // ReadHeader
+/*----------------------------------------------------------------*/
+
+
+HRESULT CImageSCI::WriteHeader(PIXELFORMAT imageFormat, Size width, Size height, BYTE numLevels)
+{
+	// write header
+	CImage::WriteHeader(imageFormat, width, height, numLevels);
+	((OSTREAM*)m_pStream)->setPos(0);
+	const SCIINFOHEADER sciInfo = {IMAGE_SCI_HEADER, (uint16_t)m_width, (uint16_t)m_height, (uint8_t)m_format, m_numLevels, 0, 0};
+	if (sizeof(SCIINFOHEADER) != m_pStream->write(&sciInfo, sizeof(SCIINFOHEADER))) {
+		LOG(LT_IMAGE, "error: failed writing the SCI image");
+		return _INVALIDFILE;
+	}
+	return _OK;
+} // WriteHeader
+/*----------------------------------------------------------------*/