DO NOT MERGE A library for encoding and decoding ETC1 textures.

// Copyright 2009 Google Inc.

//

// 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.

#ifndef __etc1_h__

#define __etc1_h__

#define ETC1_ENCODED_BLOCK_SIZE 8

#define ETC1_DECODED_BLOCK_SIZE 48

#ifndef ETC1_RGB8_OES

#define ETC1_RGB8_OES 0x8D64

#endif

typedef unsigned char etc1_byte;

typedef int etc1_bool;

typedef unsigned int etc1_uint32;

#ifdef __cplusplus

extern "C" {

#endif

// Encode a block of pixels.

//

// pIn is a pointer to a ETC_DECODED_BLOCK_SIZE array of bytes that represent a

// 4 x 4 square of 3-byte pixels in form R, G, B. Byte (3 * (x + 4 * y) is the R

// value of pixel (x, y).

//

// validPixelMask is a 16-bit mask where bit (1 << (x + y * 4)) indicates whether

// the corresponding (x,y) pixel is valid. Invalid pixel color values are ignored when compressing.

//

// pOut is an ETC1 compressed version of the data.

void etc1_encode_block(const etc1_byte* pIn, etc1_uint32 validPixelMask, etc1_byte* pOut);

// Decode a block of pixels.

//

// pIn is an ETC1 compressed version of the data.

//

// pOut is a pointer to a ETC_DECODED_BLOCK_SIZE array of bytes that represent a

// 4 x 4 square of 3-byte pixels in form R, G, B. Byte (3 * (x + 4 * y) is the R

// value of pixel (x, y).

void etc1_decode_block(const etc1_byte* pIn, etc1_byte* pOut);

// Return the size of the encoded image data (does not include size of PKM header).

etc1_uint32 etc1_get_encoded_data_size(etc1_uint32 width, etc1_uint32 height);

// Encode an entire image.

// pIn - pointer to the image data. Formatted such that

//       pixel (x,y) is at pIn + pixelSize * x + stride * y;

// pOut - pointer to encoded data. Must be large enough to store entire encoded image.

// pixelSize can be 2 or 3. 2 is an GL_UNSIGNED_SHORT_5_6_5 image, 3 is a GL_BYTE RGB image.

// returns non-zero if there is an error.

int etc1_encode_image(const etc1_byte* pIn, etc1_uint32 width, etc1_uint32 height,

        etc1_uint32 pixelSize, etc1_uint32 stride, etc1_byte* pOut);

// Decode an entire image.

// pIn - pointer to encoded data.

// pOut - pointer to the image data. Will be written such that

//        pixel (x,y) is at pIn + pixelSize * x + stride * y. Must be

//        large enough to store entire image.

// pixelSize can be 2 or 3. 2 is an GL_UNSIGNED_SHORT_5_6_5 image, 3 is a GL_BYTE RGB image.

// returns non-zero if there is an error.

int etc1_decode_image(const etc1_byte* pIn, etc1_byte* pOut,

        etc1_uint32 width, etc1_uint32 height,

        etc1_uint32 pixelSize, etc1_uint32 stride);

// Size of a PKM header, in bytes.

#define ETC_PKM_HEADER_SIZE 16

// Format a PKM header

void etc1_pkm_format_header(etc1_byte* pHeader, etc1_uint32 width, etc1_uint32 height);

// Check if a PKM header is correctly formatted.

etc1_bool etc1_pkm_is_valid(const etc1_byte* pHeader);

// Read the image width from a PKM header

etc1_uint32 etc1_pkm_get_width(const etc1_byte* pHeader);

// Read the image height from a PKM header

etc1_uint32 etc1_pkm_get_height(const etc1_byte* pHeader);

#ifdef __cplusplus

}

#endif

#endif

endif

endif

include $(BUILD_SHARED_LIBRARY)

include $(BUILD_SHARED_LIBRARY)

###############################################################################

# Build the ETC1 host static library

#

include $(CLEAR_VARS)

LOCAL_SRC_FILES:= 		\

	ETC1/etc1.cpp 	\

#

LOCAL_LDLIBS := -lpthread -ldl

LOCAL_MODULE:= libETC1

include $(BUILD_HOST_STATIC_LIBRARY)