Initial commit

engines/stark/formats/dds.cpp

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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "engines/stark/formats/dds.h"
+
+#include "common/textconsole.h"
+
+namespace Stark {
+namespace Formats {
+
+// Based on xoreos' DDS code
+
+static const uint32 kDDSID  = MKTAG('D', 'D', 'S', ' ');
+
+static const uint32 kHeaderFlagsHasMipMaps = 0x00020000;
+
+static const uint32 kPixelFlagsHasAlpha  = 0x00000001;
+static const uint32 kPixelFlagsHasFourCC = 0x00000004;
+static const uint32 kPixelFlagsIsIndexed = 0x00000020;
+static const uint32 kPixelFlagsIsRGB     = 0x00000040;
+
+DDS::~DDS() {
+	for (uint i = 0; i < _mipmaps.size(); i++) {
+		_mipmaps[i].free();
+	}
+}
+
+bool DDS::load(Common::SeekableReadStream &dds, const Common::String &name) {
+	assert(_mipmaps.empty());
+
+	_name = name;
+
+	if (!readHeader(dds)) {
+		return false;
+	}
+
+	return readData(dds);
+}
+
+const DDS::MipMaps &DDS::getMipMaps() const {
+	return _mipmaps;
+}
+
+bool DDS::readHeader(Common::SeekableReadStream &dds) {
+	// We found the FourCC of a standard DDS
+	uint32 magic = dds.readUint32BE();
+	if (magic != kDDSID) {
+		warning("Invalid DDS magic number: %d for %s", magic, _name.c_str());
+		return false;
+	}
+
+	// All DDS header should be 124 bytes (+ 4 for the FourCC)
+	uint32 headerSize = dds.readUint32LE();
+	if (headerSize != 124) {
+		warning("Invalid DDS header size: %d for %s", headerSize, _name.c_str());
+		return false;
+	}
+
+	// DDS features
+	uint32 flags = dds.readUint32LE();
+
+	// Image dimensions
+	uint32 height = dds.readUint32LE();
+	uint32 width  = dds.readUint32LE();
+
+	if ((width >= 0x8000) || (height >= 0x8000)) {
+		warning("Unsupported DDS image dimensions (%ux%u) for %s", width, height, _name.c_str());
+		return false;
+	}
+
+	dds.skip(4 + 4); // Pitch + Depth
+	//uint32 pitchOrLineSize = dds.readUint32LE();
+	//uint32 depth           = dds.readUint32LE();
+	uint32 mipMapCount     = dds.readUint32LE();
+
+	// DDS doesn't provide any mip maps, only one full-size image
+	if ((flags & kHeaderFlagsHasMipMaps) == 0) {
+		mipMapCount = 1;
+	}
+
+	dds.skip(44); // Reserved
+
+	// Read the pixel data format
+	DDSPixelFormat format;
+	format.size     = dds.readUint32LE();
+	format.flags    = dds.readUint32LE();
+	format.fourCC   = dds.readUint32BE();
+	format.bitCount = dds.readUint32LE();
+	format.rBitMask = dds.readUint32LE();
+	format.gBitMask = dds.readUint32LE();
+	format.bBitMask = dds.readUint32LE();
+	format.aBitMask = dds.readUint32LE();
+
+	// Detect which specific format it describes
+	if (!detectFormat(format)) {
+		return false;
+	}
+
+	dds.skip(16 + 4); // DDCAPS2 + Reserved
+
+	_mipmaps.resize(mipMapCount);
+	for (uint32 i = 0; i < mipMapCount; i++) {
+		_mipmaps[i].create(width, height, _format);
+
+		width  >>= 1;
+		height >>= 1;
+	}
+
+	return true;
+}
+
+bool DDS::readData(Common::SeekableReadStream &dds) {
+	for (uint i = 0; i < _mipmaps.size(); i++) {
+		Graphics::Surface &mipmap = _mipmaps[i];
+
+		uint32 size = mipmap.pitch * mipmap.h;
+		uint32 readSize = dds.read(mipmap.getPixels(), size);
+
+		if (readSize != size) {
+			warning("Inconsistent read size in DDS file: %d, expected %d for %s level %d",
+			        readSize, size, _name.c_str(), i);
+			return false;
+		}
+	}
+
+	return true;
+}
+
+bool DDS::detectFormat(const DDSPixelFormat &format) {
+	if (format.flags & kPixelFlagsHasFourCC) {
+		warning("Unsupported DDS feature: FourCC pixel format %d for %s", format.fourCC, _name.c_str());
+		return false;
+	}
+
+	if (format.flags & kPixelFlagsIsIndexed) {
+		warning("Unsupported DDS feature: Indexed %d-bits pixel format for %s", format.bitCount, _name.c_str());
+		return false;
+	}
+
+	if (!(format.flags & kPixelFlagsIsRGB)) {
+		warning("Only RGB DDS files are supported for %s", _name.c_str());
+		return false;
+	}
+
+	if (format.bitCount != 24 && format.bitCount != 32) {
+		warning("Only 24-bits and 32-bits DDS files are supported for %s", _name.c_str());
+		return false;
+	}
+
+	if ((format.flags & kPixelFlagsHasAlpha) &&
+	           (format.bitCount == 32) &&
+	           (format.rBitMask == 0x00FF0000) && (format.gBitMask == 0x0000FF00) &&
+	           (format.bBitMask == 0x000000FF) && (format.aBitMask == 0xFF000000)) {
+		_format = Graphics::PixelFormat::createFormatBGRA32();
+		return true;
+	} else if (!(format.flags & kPixelFlagsHasAlpha) &&
+	           (format.bitCount == 24) &&
+	           (format.rBitMask == 0x00FF0000) && (format.gBitMask == 0x0000FF00) &&
+	           (format.bBitMask == 0x000000FF)) {
+		_format = Graphics::PixelFormat::createFormatBGR24();
+		return true;
+	} else {
+		warning("Unsupported pixel format (%X, %X, %d, %X, %X, %X, %X) for %s",
+		        format.flags, format.fourCC, format.bitCount,
+		        format.rBitMask, format.gBitMask, format.bBitMask, format.aBitMask,
+		        _name.c_str());
+		return false;
+	}
+}
+
+} // End of namespace Formats
+} // End of namespace Stark