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annotate Framework/Scene2D/Internals/CairoLookupTableTextureRenderer.cpp @ 768:55411e7da2f7

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LookupTableTextureSceneLayer
author Sebastien Jodogne <s.jodogne@gmail.com>
date Thu, 23 May 2019 20:04:33 +0200
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children 6e888cf6a48b
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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) 2017-2019 Osimis S.A., Belgium
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6 *
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7 * This program is free software: you can redistribute it and/or
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8 * modify it under the terms of the GNU Affero General Public License
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9 * as published by the Free Software Foundation, either version 3 of
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10 * the License, or (at your option) any later version.
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11 *
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12 * This program is distributed in the hope that it will be useful, but
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13 * WITHOUT ANY WARRANTY; without even the implied warranty of
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 * Affero General Public License for more details.
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16 *
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17 * You should have received a copy of the GNU Affero General Public License
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18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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19 **/
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20
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21
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22 #include "CairoLookupTableTextureRenderer.h"
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23
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24 #include "CairoColorTextureRenderer.h"
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25 #include "../LookupTableTextureSceneLayer.h"
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26
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27 #include <Core/OrthancException.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 CairoLookupTableTextureRenderer::Update(const ISceneLayer& layer)
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34 {
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35 const LookupTableTextureSceneLayer& l = dynamic_cast<const LookupTableTextureSceneLayer&>(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 const float a = l.GetMinValue();
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41 float slope;
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42
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43 if (l.GetMinValue() >= l.GetMaxValue())
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44 {
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45 slope = 0;
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46 }
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47 else
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48 {
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49 slope = 256.0f / (l.GetMaxValue() - l.GetMinValue());
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50 }
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51
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52 const Orthanc::ImageAccessor& source = l.GetTexture();
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53 const unsigned int width = source.GetWidth();
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54 const unsigned int height = source.GetHeight();
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55 texture_.SetSize(width, height, true /* alpha channel is enabled */);
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56
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57 Orthanc::ImageAccessor target;
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58 texture_.GetWriteableAccessor(target);
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59
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60 const std::vector<uint8_t>& lut = l.GetLookupTable();
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61 if (lut.size() != 4 * 256)
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62 {
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63 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
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64 }
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65
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66 assert(source.GetFormat() == Orthanc::PixelFormat_Float32 &&
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67 target.GetFormat() == Orthanc::PixelFormat_BGRA32 &&
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68 sizeof(float) == 4);
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69
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70 for (unsigned int y = 0; y < height; y++)
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71 {
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72 const float* p = reinterpret_cast<const float*>(source.GetConstRow(y));
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73 uint8_t* q = reinterpret_cast<uint8_t*>(target.GetRow(y));
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74
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75 for (unsigned int x = 0; x < width; x++)
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76 {
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77 float v = (*p - a) * slope;
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78 if (v <= 0)
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79 {
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80 v = 0;
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81 }
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82 else if (v >= 255)
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83 {
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84 v = 255;
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85 }
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86
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87 uint8_t vv = static_cast<uint8_t>(v);
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88
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89 q[0] = lut[4 * vv + 2]; // B
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90 q[1] = lut[4 * vv + 1]; // G
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91 q[2] = lut[4 * vv + 0]; // R
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92 q[3] = lut[4 * vv + 3]; // A
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93
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94 p++;
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95 q += 4;
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96 }
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97 }
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98
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99 cairo_surface_mark_dirty(texture_.GetObject());
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100 }
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101
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102 void CairoLookupTableTextureRenderer::Render(const AffineTransform2D& transform)
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103 {
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104 CairoColorTextureRenderer::RenderColorTexture(target_, transform, texture_,
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105 textureTransform_, isLinearInterpolation_);
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106 }
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107 }
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108 }