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comparison Framework/Scene2D/Internals/CairoTextRenderer.cpp @ 597:9e51fb773bbd

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CairoCompositor
author Sebastien Jodogne <s.jodogne@gmail.com>
date Fri, 26 Apr 2019 17:28:18 +0200
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children 61ba4b504e9a
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596:b716763571ad 597:9e51fb773bbd
1 /**
2 * Stone of Orthanc
3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
4 * Department, University Hospital of Liege, Belgium
5 * Copyright (C) 2017-2019 Osimis S.A., Belgium
6 *
7 * This program is free software: you can redistribute it and/or
8 * modify it under the terms of the GNU Affero General Public License
9 * as published by the Free Software Foundation, either version 3 of
10 * the License, or (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Affero General Public License for more details.
16 *
17 * You should have received a copy of the GNU Affero General Public License
18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
19 **/
20
21
22 #include "CairoTextRenderer.h"
23
24 #include <Core/OrthancException.h>
25
26 namespace OrthancStone
27 {
28 namespace Internals
29 {
30 CairoTextRenderer::CairoTextRenderer(ICairoContextProvider& target,
31 const GlyphBitmapAlphabet& alphabet,
32 const TextSceneLayer& layer) :
33 CairoBaseRenderer(target, layer)
34 {
35 std::auto_ptr<Orthanc::ImageAccessor> source(alphabet.RenderText(layer.GetText()));
36
37 if (source.get() != NULL)
38 {
39 text_.SetSize(source->GetWidth(), source->GetHeight(), true);
40
41 Orthanc::ImageAccessor target;
42 text_.GetWriteableAccessor(target);
43
44 if (source->GetFormat() != Orthanc::PixelFormat_Grayscale8 ||
45 target.GetFormat() != Orthanc::PixelFormat_BGRA32)
46 {
47 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
48 }
49
50 const unsigned int width = source->GetWidth();
51 const unsigned int red = layer.GetRed();
52 const unsigned int green = layer.GetGreen();
53 const unsigned int blue = layer.GetBlue();
54
55 for (unsigned int y = 0; y < source->GetHeight(); y++)
56 {
57 const uint8_t* p = reinterpret_cast<const uint8_t*>(source->GetConstRow(y));
58 uint8_t* q = reinterpret_cast<uint8_t*>(target.GetRow(y));
59
60 for (unsigned int x = 0; x < width; x++)
61 {
62 unsigned int alpha = *p;
63
64 // Premultiplied alpha
65 q[0] = static_cast<uint8_t>((blue * alpha) / 255);
66 q[1] = static_cast<uint8_t>((green * alpha) / 255);
67 q[2] = static_cast<uint8_t>((red * alpha) / 255);
68 q[3] = *p;
69
70 p++;
71 q += 4;
72 }
73 }
74
75 cairo_surface_mark_dirty(text_.GetObject());
76 }
77 }
78
79
80 void CairoTextRenderer::Render(const AffineTransform2D& transform)
81 {
82 if (text_.GetWidth() != 0 &&
83 text_.GetHeight() != 0)
84 {
85 const TextSceneLayer& layer = GetLayer<TextSceneLayer>();
86
87 cairo_t* cr = GetCairoContext();
88 cairo_set_source_rgb(cr, layer.GetRedAsFloat(), layer.GetGreenAsFloat(), layer.GetBlueAsFloat());
89
90 double dx, dy; // In pixels
91 ComputeAnchorTranslation(dx, dy, layer.GetAnchor(), text_.GetWidth(),
92 text_.GetHeight(), layer.GetBorder());
93
94 double x = layer.GetX();
95 double y = layer.GetY();
96 transform.Apply(x, y);
97
98 cairo_save(cr);
99
100 cairo_matrix_t t;
101 cairo_matrix_init_identity(&t);
102 cairo_matrix_translate(&t, x + dx, y + dy);
103 cairo_transform(cr, &t);
104
105 cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
106 cairo_set_source_surface(cr, text_.GetObject(), 0, 0);
107 cairo_pattern_set_filter(cairo_get_source(cr), CAIRO_FILTER_BILINEAR);
108 cairo_paint(cr);
109
110 cairo_restore(cr);
111 }
112 }
113 }
114 }