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comparison Framework/Scene2D/Internals/CairoFloatTextureRenderer.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 55411e7da2f7 cfb4d39065a4
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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 "CairoFloatTextureRenderer.h"
23
24 #include "../FloatTextureSceneLayer.h"
25
26 namespace OrthancStone
27 {
28 namespace Internals
29 {
30 void CairoFloatTextureRenderer::Update(const ISceneLayer& layer)
31 {
32 const FloatTextureSceneLayer& l = dynamic_cast<const FloatTextureSceneLayer&>(layer);
33
34 textureTransform_ = l.GetTransform();
35 isLinearInterpolation_ = l.IsLinearInterpolation();
36
37 float windowCenter, windowWidth;
38 l.GetWindowing(windowCenter, windowWidth);
39
40 const float a = windowCenter - windowWidth;
41 const float slope = 256.0f / (2.0f * windowWidth);
42
43 const Orthanc::ImageAccessor& source = l.GetTexture();
44 const unsigned int width = source.GetWidth();
45 const unsigned int height = source.GetHeight();
46 texture_.SetSize(width, height, false);
47
48 Orthanc::ImageAccessor target;
49 texture_.GetWriteableAccessor(target);
50
51 assert(source.GetFormat() == Orthanc::PixelFormat_Float32 &&
52 target.GetFormat() == Orthanc::PixelFormat_BGRA32 &&
53 sizeof(float) == 4);
54
55 for (unsigned int y = 0; y < height; y++)
56 {
57 const float* p = reinterpret_cast<const float*>(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 float v = (*p - a) * slope;
63 if (v <= 0)
64 {
65 v = 0;
66 }
67 else if (v >= 255)
68 {
69 v = 255;
70 }
71
72 uint8_t vv = static_cast<uint8_t>(v);
73
74 q[0] = vv;
75 q[1] = vv;
76 q[2] = vv;
77
78 p++;
79 q += 4;
80 }
81 }
82 }
83
84
85 void CairoFloatTextureRenderer::Render(const AffineTransform2D& transform)
86 {
87 cairo_t* cr = target_.GetCairoContext();
88
89 AffineTransform2D t =
90 AffineTransform2D::Combine(transform, textureTransform_);
91 Matrix h = t.GetHomogeneousMatrix();
92
93 cairo_save(cr);
94
95 cairo_matrix_t m;
96 cairo_matrix_init(&m, h(0, 0), h(1, 0), h(0, 1), h(1, 1), h(0, 2), h(1, 2));
97 cairo_transform(cr, &m);
98
99 cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
100 cairo_set_source_surface(cr, texture_.GetObject(), 0, 0);
101
102 if (isLinearInterpolation_)
103 {
104 cairo_pattern_set_filter(cairo_get_source(cr), CAIRO_FILTER_BILINEAR);
105 }
106 else
107 {
108 cairo_pattern_set_filter(cairo_get_source(cr), CAIRO_FILTER_NEAREST);
109 }
110
111 cairo_paint(cr);
112
113 cairo_restore(cr);
114 }
115 }
116 }