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60 lines
2.7 KiB
60 lines
2.7 KiB
/****************************************************************************
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Copyright (c) 2010-2012 cocos2d-x.org
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Copyright (c) 2013-2016 Chukong Technologies Inc.
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Copyright (c) 2017-2023 Xiamen Yaji Software Co., Ltd.
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http://www.cocos.com
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights to
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use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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of the Software, and to permit persons to whom the Software is furnished to do so,
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subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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****************************************************************************/
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#include "base/astc.h"
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#include "platform/Image.h"
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static const unsigned int MAGIC = 0x5CA1AB13;
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static const astc_byte ASTC_HEADER_SIZE_X_BEGIN = 7;
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static const astc_byte ASTC_HEADER_SIZE_Y_BEGIN = 10;
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bool astcIsValid(const astc_byte *pHeader) {
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uint32_t magicval = static_cast<uint32_t>(pHeader[0]) +
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static_cast<uint32_t>(pHeader[1]) * 256 +
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static_cast<uint32_t>(pHeader[2]) * 65536 +
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static_cast<uint32_t>(pHeader[3]) * 16777216;
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if (magicval != MAGIC) {
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return false;
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}
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int xdim = pHeader[ASTC_HEADER_MAGIC];
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int ydim = pHeader[ASTC_HEADER_MAGIC + 1];
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int zdim = pHeader[ASTC_HEADER_MAGIC + 2];
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return !((xdim < 3 || xdim > 6 || ydim < 3 || ydim > 6 || zdim < 3 || zdim > 6) &&
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(xdim < 4 || xdim == 7 || xdim == 9 || xdim == 11 || xdim > 12 ||
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ydim < 4 || ydim == 7 || ydim == 9 || ydim == 11 || ydim > 12 || zdim != 1));
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}
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int astcGetWidth(const astc_byte *pHeader) {
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int xsize = pHeader[ASTC_HEADER_SIZE_X_BEGIN] + (pHeader[ASTC_HEADER_SIZE_X_BEGIN + 1] * 256) + (pHeader[ASTC_HEADER_SIZE_X_BEGIN + 2] * 65536);
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return xsize;
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}
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int astcGetHeight(const astc_byte *pHeader) {
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int ysize = pHeader[ASTC_HEADER_SIZE_Y_BEGIN] + (pHeader[ASTC_HEADER_SIZE_Y_BEGIN + 1] * 256) + (pHeader[ASTC_HEADER_SIZE_Y_BEGIN + 2] * 65536);
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return ysize;
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}
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