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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 "CairoTextRenderer.h"
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23
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24 #include <Core/OrthancException.h>
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25
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26 namespace OrthancStone
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27 {
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28 namespace Internals
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29 {
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30 CairoTextRenderer::CairoTextRenderer(ICairoContextProvider& target,
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31 const GlyphBitmapAlphabet& alphabet,
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32 const TextSceneLayer& layer) :
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33 CairoBaseRenderer(target, layer)
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34 {
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35 std::auto_ptr<Orthanc::ImageAccessor> source(alphabet.RenderText(layer.GetText()));
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36
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37 if (source.get() != NULL)
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38 {
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39 text_.SetSize(source->GetWidth(), source->GetHeight(), true);
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40
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41 Orthanc::ImageAccessor target;
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42 text_.GetWriteableAccessor(target);
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43
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44 if (source->GetFormat() != Orthanc::PixelFormat_Grayscale8 ||
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45 target.GetFormat() != Orthanc::PixelFormat_BGRA32)
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46 {
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47 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
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48 }
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49
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50 const unsigned int width = source->GetWidth();
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51 const unsigned int red = layer.GetRed();
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52 const unsigned int green = layer.GetGreen();
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53 const unsigned int blue = layer.GetBlue();
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54
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55 for (unsigned int y = 0; y < source->GetHeight(); y++)
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56 {
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57 const uint8_t* p = reinterpret_cast<const uint8_t*>(source->GetConstRow(y));
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58 uint8_t* q = reinterpret_cast<uint8_t*>(target.GetRow(y));
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59
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60 for (unsigned int x = 0; x < width; x++)
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61 {
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62 unsigned int alpha = *p;
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63
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64 // Premultiplied alpha
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65 q[0] = static_cast<uint8_t>((blue * alpha) / 255);
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66 q[1] = static_cast<uint8_t>((green * alpha) / 255);
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67 q[2] = static_cast<uint8_t>((red * alpha) / 255);
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68 q[3] = *p;
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69
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70 p++;
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71 q += 4;
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72 }
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73 }
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74
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75 cairo_surface_mark_dirty(text_.GetObject());
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76 }
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77 }
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78
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79
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80 void CairoTextRenderer::Render(const AffineTransform2D& transform)
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81 {
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82 if (text_.GetWidth() != 0 &&
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83 text_.GetHeight() != 0)
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84 {
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85 const TextSceneLayer& layer = GetLayer<TextSceneLayer>();
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86
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87 cairo_t* cr = GetCairoContext();
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88 cairo_set_source_rgb(cr, layer.GetRedAsFloat(), layer.GetGreenAsFloat(), layer.GetBlueAsFloat());
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89
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90 double dx, dy; // In pixels
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91 ComputeAnchorTranslation(dx, dy, layer.GetAnchor(), text_.GetWidth(),
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92 text_.GetHeight(), layer.GetBorder());
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93
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94 double x = layer.GetX();
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95 double y = layer.GetY();
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96 transform.Apply(x, y);
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97
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98 cairo_save(cr);
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99
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100 cairo_matrix_t t;
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101 cairo_matrix_init_identity(&t);
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102 cairo_matrix_translate(&t, x + dx, y + dy);
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103 cairo_transform(cr, &t);
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104
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105 cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
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106 cairo_set_source_surface(cr, text_.GetObject(), 0, 0);
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107 cairo_pattern_set_filter(cairo_get_source(cr), CAIRO_FILTER_BILINEAR);
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108 cairo_paint(cr);
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109
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110 cairo_restore(cr);
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111 }
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112 }
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113 }
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114 }
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