Merge pull request #8548 from tagcup/etc2comp

Add ETC1/ETC2 compression support though etc2comp.

1 files changed, 136 insertions, 0 deletions

diff --git a/thirdparty/etc2comp/EtcFile.h b/thirdparty/etc2comp/EtcFile.h
new file mode 100644
index 0000000000..69bf3b2d3a
--- /dev/null
+++ b/thirdparty/etc2comp/EtcFile.h
@@ -0,0 +1,136 @@
+/*
+ * Copyright 2015 The Etc2Comp Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include "EtcColorFloatRGBA.h"
+#include "EtcImage.h"
+#include "Etc.h"
+
+namespace Etc
+{
+	class FileHeader;
+	class SourceImage;
+
+	class File
+	{
+	public:
+
+		enum class Format
+		{
+			INFER_FROM_FILE_EXTENSION,
+			PKM,
+			KTX,
+		};
+
+		File(const char *a_pstrFilename, Format a_fileformat, Image::Format a_imageformat,
+				unsigned char *a_paucEncodingBits, unsigned int a_uiEncodingBitsBytes,
+				unsigned int a_uiSourceWidth, unsigned int a_uiSourceHeight,
+				unsigned int a_uiExtendedWidth, unsigned int a_uiExtendedHeight);
+
+		File(const char *a_pstrFilename, Format a_fileformat, Image::Format a_imageformat,
+			unsigned int a_uiNumMipmaps, RawImage *pMipmapImages,
+			unsigned int a_uiSourceWidth, unsigned int a_uiSourceHeight );
+
+		File(const char *a_pstrFilename, Format a_fileformat);
+		~File();
+		const char *GetFilename(void) { return m_pstrFilename; }
+
+		void Read(const char *a_pstrFilename);
+		void Write(void);
+
+		inline unsigned int GetSourceWidth(void)
+		{
+			return m_uiSourceWidth;
+		}
+
+		inline unsigned int GetSourceHeight(void)
+		{
+			return m_uiSourceHeight;
+		}
+
+		inline unsigned int GetExtendedWidth(unsigned int mipmapIndex = 0)
+		{
+			if (mipmapIndex < m_uiNumMipmaps)
+			{
+				return m_pMipmapImages[mipmapIndex].uiExtendedWidth;
+			}
+			else
+			{
+				return 0;
+			}
+		}
+
+		inline unsigned int GetExtendedHeight(unsigned int mipmapIndex = 0)
+		{
+			if (mipmapIndex < m_uiNumMipmaps)
+			{
+				return m_pMipmapImages[mipmapIndex].uiExtendedHeight;
+			}
+			else
+			{
+				return 0;
+			}
+		}
+
+		inline Image::Format GetImageFormat()
+		{
+			return m_imageformat;
+		}
+
+		inline unsigned int GetEncodingBitsBytes(unsigned int mipmapIndex = 0)
+		{
+			if (mipmapIndex < m_uiNumMipmaps)
+			{
+				return m_pMipmapImages[mipmapIndex].uiEncodingBitsBytes;
+			}
+			else
+			{
+				return 0;
+			}
+		}
+
+		inline unsigned char*  GetEncodingBits(unsigned int mipmapIndex = 0)
+		{
+			if( mipmapIndex < m_uiNumMipmaps)
+			{
+				return m_pMipmapImages[mipmapIndex].paucEncodingBits.get();
+			}
+			else
+			{
+				return nullptr;
+			}
+		}
+
+		inline unsigned int GetNumMipmaps() 
+		{
+			return m_uiNumMipmaps; 
+		}
+
+		void UseSingleBlock(int a_iPixelX = -1, int a_iPixelY = -1);
+	private:
+
+		char *m_pstrFilename;               // includes directory path and file extension
+		Format m_fileformat;
+		Image::Format m_imageformat;
+		FileHeader *m_pheader;
+		unsigned int m_uiNumMipmaps;
+		RawImage*	 m_pMipmapImages;
+		unsigned int m_uiSourceWidth;
+		unsigned int m_uiSourceHeight;
+	};
+
+}