Mercurial > hg > orthanc-stone

comparison Framework/Scene2D/Internals/OpenGLInfoPanelRenderer.cpp @ 1325:be17fed8c7c5 broker

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Added flag in InfoPanelSceneLayer to apply the scene rotation to the displayed image.
author Benjamin Golinvaux <bgo@osimis.io>
date Tue, 24 Mar 2020 20:34:28 +0100
parents 2d8ab34c8c91
children
comparison
equal deleted inserted replaced
1324:4d8d642f7036 1325:be17fed8c7c5
30 if (!context_.IsContextLost()) 30 if (!context_.IsContextLost())
31 { 31 {
32 context_.MakeCurrent(); 32 context_.MakeCurrent();
33 texture_.reset(new OpenGL::OpenGLTexture(context_)); 33 texture_.reset(new OpenGL::OpenGLTexture(context_));
34 texture_->Load(layer.GetTexture(), layer.IsLinearInterpolation()); 34 texture_->Load(layer.GetTexture(), layer.IsLinearInterpolation());
35 applySceneRotation_ = layer.ShouldApplySceneRotation();
35 anchor_ = layer.GetAnchor(); 36 anchor_ = layer.GetAnchor();
36 } 37 }
37 } 38 }
38 39
39 OpenGLInfoPanelRenderer::OpenGLInfoPanelRenderer(OpenGL::IOpenGLContext& context, 40 OpenGLInfoPanelRenderer::OpenGLInfoPanelRenderer(OpenGL::IOpenGLContext& context,
40 OpenGLColorTextureProgram& program, 41 OpenGLColorTextureProgram& program,
41 const InfoPanelSceneLayer& layer) : 42 const InfoPanelSceneLayer& layer) :
42 context_(context), 43 context_(context),
43 program_(program), 44 program_(program),
44 anchor_(BitmapAnchor_TopLeft) 45 anchor_(BitmapAnchor_TopLeft),
46 applySceneRotation_(false)
45 { 47 {
46 LoadTexture(layer); 48 LoadTexture(layer);
47 } 49 }
48
49 50
50 void OpenGLInfoPanelRenderer::Render(const AffineTransform2D& transform, 51 void OpenGLInfoPanelRenderer::Render(const AffineTransform2D& transform,
51 unsigned int canvasWidth, 52 unsigned int canvasWidth,
52 unsigned int canvasHeight) 53 unsigned int canvasHeight)
53 { 54 {
58 dx, dy, anchor_, texture_->GetWidth(), texture_->GetHeight(), 59 dx, dy, anchor_, texture_->GetWidth(), texture_->GetHeight(),
59 canvasWidth, canvasHeight); 60 canvasWidth, canvasHeight);
60 61
61 // The position of this type of layer is layer: Ignore the 62 // The position of this type of layer is layer: Ignore the
62 // "transform" coming from the scene 63 // "transform" coming from the scene
63 program_.Apply(*texture_, AffineTransform2D::CreateOffset(dx, dy), true); 64 AffineTransform2D actualTransform =
65 AffineTransform2D::CreateOffset(dx, dy);
66
67 if (applySceneRotation_)
68 {
69 // the transformation is as follows:
70 // - originally, the image is aligned so that its top left corner
71 // is at 0,0
72 // - first, we translate the image by -w/2,-h/2
73 // - then we rotate it, so that the next rotation will make the
74 // image rotate around its center.
75 // - then, we translate the image by +w/2,+h/2 to put it
76 // back in place
77 // - the fourth and last transform is the one that brings the
78 // image to its desired anchored location.
79
80 int32_t halfWidth =
81 static_cast<int32_t>(0.5 * texture_->GetWidth());
82
83 int32_t halfHeight=
84 static_cast<int32_t>(0.5 * texture_->GetHeight());
85
86 AffineTransform2D translation1 =
87 AffineTransform2D::CreateOffset(-halfWidth, -halfHeight);
88
89 const Matrix& sceneTransformM = transform.GetHomogeneousMatrix();
90 Matrix r;
91 Matrix q;
92 LinearAlgebra::RQDecomposition3x3(r, q, sceneTransformM);
93
94 // counterintuitively, q is the rotation and r is the upper
95 // triangular
96 AffineTransform2D rotation(q);
97
98 AffineTransform2D translation2 =
99 AffineTransform2D::CreateOffset(halfWidth, halfHeight);
100
101 // please note that the last argument is the 1st applied
102 // transformation (rationale: if arguments are a, b and c, then
103 // the resulting matrix is a*b*c:
104 // x2 = (a*b*c)*x1 = (a*(b*(c*x1))) (you can see that the result
105 // of c*x1 is transformed by b, and the result of b*c*x1 is trans-
106 // formed by a)
107 actualTransform = AffineTransform2D::Combine(actualTransform,
108 translation2,
109 rotation,
110 translation1);
111 }
112
113 program_.Apply(*texture_, actualTransform, true);
64 } 114 }
65 } 115 }
66 } 116 }
67 } 117 }