annotate OrthancStone/Sources/Scene2D/Internals/CairoFloatTextureRenderer.cpp @ 1925:a7a77488ddb1

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author Sebastien Jodogne <s.jodogne@gmail.com>
date Wed, 23 Mar 2022 14:21:22 +0100
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1 /**
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2 * Stone of Orthanc
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3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
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4 * Department, University Hospital of Liege, Belgium
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5 * Copyright (C) 2017-2022 Osimis S.A., Belgium
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6 * Copyright (C) 2021-2022 Sebastien Jodogne, ICTEAM UCLouvain, Belgium
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7 *
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8 * This program is free software: you can redistribute it and/or
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9 * modify it under the terms of the GNU Lesser General Public License
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10 * as published by the Free Software Foundation, either version 3 of
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11 * the License, or (at your option) any later version.
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12 *
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13 * This program is distributed in the hope that it will be useful, but
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14 * WITHOUT ANY WARRANTY; without even the implied warranty of
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15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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16 * Lesser General Public License for more details.
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17 *
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18 * You should have received a copy of the GNU Lesser General Public
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19 * License along with this program. If not, see
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20 * <http://www.gnu.org/licenses/>.
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21 **/
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22
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23
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24 #include "CairoFloatTextureRenderer.h"
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25
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26 #include "CairoColorTextureRenderer.h"
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27 #include "../FloatTextureSceneLayer.h"
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28
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29 namespace OrthancStone
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30 {
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31 namespace Internals
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32 {
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33 void CairoFloatTextureRenderer::Update(const ISceneLayer& layer)
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34 {
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35 const FloatTextureSceneLayer& l = dynamic_cast<const FloatTextureSceneLayer&>(layer);
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36
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37 textureTransform_ = l.GetTransform();
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38 isLinearInterpolation_ = l.IsLinearInterpolation();
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39
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40 float windowCenter, windowWidth;
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41 l.GetWindowing(windowCenter, windowWidth);
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42
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43 const float a = windowCenter - windowWidth / 2.0f;
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44 const float slope = 256.0f / windowWidth;
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45
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46 const Orthanc::ImageAccessor& source = l.GetTexture();
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47 const unsigned int width = source.GetWidth();
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48 const unsigned int height = source.GetHeight();
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49 texture_.SetSize(width, height, false);
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50
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51 Orthanc::ImageAccessor target;
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52 texture_.GetWriteableAccessor(target);
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53
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54 assert(source.GetFormat() == Orthanc::PixelFormat_Float32 &&
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55 target.GetFormat() == Orthanc::PixelFormat_BGRA32 &&
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56 sizeof(float) == 4);
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57
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58 static const float LOG_NORMALIZATION = 255.0f / log(1.0f + 255.0f);
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59
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60 for (unsigned int y = 0; y < height; y++)
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61 {
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62 const float* p = reinterpret_cast<const float*>(source.GetConstRow(y));
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63 uint8_t* q = reinterpret_cast<uint8_t*>(target.GetRow(y));
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64
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65 for (unsigned int x = 0; x < width; x++)
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66 {
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67 float v = (*p - a) * slope;
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68 if (v <= 0)
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69 {
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70 v = 0;
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71 }
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72 else if (v >= 255)
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73 {
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74 v = 255;
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75 }
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76
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77 if (l.IsApplyLog())
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78 {
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79 // https://theailearner.com/2019/01/01/log-transformation/
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80 v = LOG_NORMALIZATION * log(1.0f + static_cast<float>(v));
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81 }
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82
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83 assert(v >= 0.0f && v <= 255.0f);
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84
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85 uint8_t vv = static_cast<uint8_t>(v);
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86
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87 if (l.IsInverted())
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88 {
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89 vv = 255 - vv;
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90 }
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91
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92 q[0] = vv;
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93 q[1] = vv;
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94 q[2] = vv;
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96 p++;
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97 q += 4;
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98 }
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99 }
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100 }
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101
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102
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103 void CairoFloatTextureRenderer::Render(const AffineTransform2D& transform,
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104 unsigned int canvasWidth,
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105 unsigned int canvasHeight)
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106 {
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107 CairoColorTextureRenderer::RenderColorTexture(target_, transform, texture_,
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108 textureTransform_, isLinearInterpolation_);
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109 }
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110 }
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111 }