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61 lines
2.3 KiB
C++
61 lines
2.3 KiB
C++
/*
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Copyright 2007 nVidia, Inc.
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Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License.
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You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and limitations under the License.
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*/
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// utility class holding common routines
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#ifndef _AVPCL_UTILS_H
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#define _AVPCL_UTILS_H
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#include "nvmath/Vector.h"
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namespace AVPCL {
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inline int SIGN_EXTEND(int x, int nb) { return ((((x)&(1<<((nb)-1)))?((~0)<<(nb)):0)|(x)); }
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static const int INDEXMODE_BITS = 1; // 2 different index modes
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static const int NINDEXMODES = (1<<(INDEXMODE_BITS));
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static const int INDEXMODE_ALPHA_IS_3BITS = 0;
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static const int INDEXMODE_ALPHA_IS_2BITS = 1;
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static const int ROTATEMODE_BITS = 2; // 4 different rotate modes
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static const int NROTATEMODES = (1<<(ROTATEMODE_BITS));
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static const int ROTATEMODE_RGBA_RGBA = 0;
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static const int ROTATEMODE_RGBA_AGBR = 1;
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static const int ROTATEMODE_RGBA_RABG = 2;
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static const int ROTATEMODE_RGBA_RGAB = 3;
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class Utils
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{
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public:
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// error metrics
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static float metric4(nv::Vector4::Arg a, nv::Vector4::Arg b);
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static float metric3(nv::Vector3::Arg a, nv::Vector3::Arg b, int rotatemode);
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static float metric1(float a, float b, int rotatemode);
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static float metric4premult(nv::Vector4::Arg rgba0, nv::Vector4::Arg rgba1);
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static float metric3premult_alphaout(nv::Vector3::Arg rgb0, float a0, nv::Vector3::Arg rgb1, float a1);
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static float metric3premult_alphain(nv::Vector3::Arg rgb0, nv::Vector3::Arg rgb1, int rotatemode);
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static float metric1premult(float rgb0, float a0, float rgb1, float a1, int rotatemode);
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static float premult(float r, float a);
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// quantization and unquantization
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static int unquantize(int q, int prec);
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static int quantize(float value, int prec);
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// lerping
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static int lerp(int a, int b, int i, int bias, int denom);
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static nv::Vector4 lerp(nv::Vector4::Arg a, nv::Vector4::Arg b, int i, int bias, int denom);
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};
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}
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#endif |