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90 lines
2.9 KiB
C++
90 lines
2.9 KiB
C++
// Copyright (c) 2009-2011 Ignacio Castano <castano@gmail.com>
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// Copyright (c) 2007-2009 NVIDIA Corporation -- 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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#include "CompressorRGBE.h"
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#include "CompressionOptions.h"
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#include "OutputOptions.h"
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#include "nvimage/Image.h"
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#include "nvimage/FloatImage.h"
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#include "nvmath/Color.h"
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#include "nvcore/Debug.h"
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using namespace nv;
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using namespace nvtt;
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static Color32 toRgbe8(float r, float g, float b)
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{
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Color32 c;
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float v = max(max(r, g), b);
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if (v < 1e-32) {
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c.r = c.g = c.b = c.a = 0;
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}
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else {
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int e;
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v = frexp(v, &e) * 256.0f / v;
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c.r = uint8(clamp(r * v, 0.0f, 255.0f));
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c.g = uint8(clamp(g * v, 0.0f, 255.0f));
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c.b = uint8(clamp(b * v, 0.0f, 255.0f));
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c.a = e + 128;
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}
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return c;
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}
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void CompressorRGBE::compress(nvtt::AlphaMode /*alphaMode*/, uint w, uint h, uint d, const float * data, nvtt::TaskDispatcher * dispatcher, const nvtt::CompressionOptions::Private & compressionOptions, const nvtt::OutputOptions::Private & outputOptions)
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{
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nvDebugCheck (compressionOptions.format == nvtt::Format_RGBE);
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uint srcPitch = w;
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uint srcPlane = w * h * d;
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// Allocate output scanline.
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Color32 * dst = new Color32[w];
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for (uint y = 0; y < h*d; y++)
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{
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const float * src = (const float *)data + y * srcPitch;
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for (uint x = 0; x < w; x++)
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{
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float r = src[x + 0 * srcPlane];
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float g = src[x + 1 * srcPlane];
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float b = src[x + 2 * srcPlane];
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dst[x] = toRgbe8(r, g, b);
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}
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if (outputOptions.outputHandler != NULL)
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{
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outputOptions.outputHandler->writeData(dst, w * 4);
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}
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}
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delete [] dst;
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}
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