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119 lines
3.7 KiB
C++
119 lines
3.7 KiB
C++
// Copyright NVIDIA Corporation 2007 -- Ignacio Castano <icastano@nvidia.com>
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//
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// Permission is hereby granted, free of charge, to any person
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// obtaining a copy of this software and associated documentation
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// files (the "Software"), to deal in the Software without
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// restriction, including without limitation the rights to use,
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// copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following
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// conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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// OTHER DEALINGS IN THE SOFTWARE.
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#pragma once
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#ifndef NV_IMAGE_PIXELFORMAT_H
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#define NV_IMAGE_PIXELFORMAT_H
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#include "nvimage.h"
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namespace nv
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{
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namespace PixelFormat
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{
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// Convert component @a c having @a inbits to the returned value having @a outbits.
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inline uint convert(uint c, uint inbits, uint outbits)
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{
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if (inbits == 0)
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{
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return 0;
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}
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else if (inbits >= outbits)
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{
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// truncate
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return c >> (inbits - outbits);
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}
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else
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{
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// bitexpand
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return (c << (outbits - inbits)) | convert(c, inbits, outbits - inbits);
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}
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}
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// Get pixel component shift and size given its mask.
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inline void maskShiftAndSize(uint mask, uint * shift, uint * size)
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{
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if (!mask)
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{
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*shift = 0;
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*size = 0;
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return;
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}
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*shift = 0;
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while((mask & 1) == 0) {
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++(*shift);
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mask >>= 1;
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}
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*size = 0;
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while((mask & 1) == 1) {
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++(*size);
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mask >>= 1;
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}
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}
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inline float quantizeCeil(float f, int inbits, int outbits)
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{
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nvDebugCheck(f >= 0.0f && f <= 1.0f);
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//uint i = f * (float(1 << inbits) - 1);
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//i = convert(i, inbits, outbits);
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//float result = float(i) / (float(1 << outbits) - 1);
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//nvCheck(result >= f);
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float result;
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int offset = 0;
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do {
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uint i = offset + uint(f * (float(1 << inbits) - 1));
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i = convert(i, inbits, outbits);
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result = float(i) / (float(1 << outbits) - 1);
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offset++;
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} while (result < f);
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return result;
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}
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/*
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inline float quantizeRound(float f, int bits)
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{
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nvDebugCheck(f >= 0.0f && f <= 1.0f);
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float scale = float(1 << bits);
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return fround(f * scale) / scale;
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}
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inline float quantizeFloor(float f, int bits)
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{
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nvDebugCheck(f >= 0.0f && f <= 1.0f);
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float scale = float(1 << bits);
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return floor(f * scale) / scale;
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}
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*/
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} // PixelFormat namespace
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} // nv namespace
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#endif // NV_IMAGE_PIXELFORMAT_H
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