Mercurial > hg > orthanc-stone
diff OrthancStone/Sources/Scene2D/Internals/CairoInfoPanelRenderer.cpp @ 1512:244ad1e4e76a
reorganization of folders
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Tue, 07 Jul 2020 16:21:02 +0200 |
parents | Framework/Scene2D/Internals/CairoInfoPanelRenderer.cpp@be17fed8c7c5 |
children | 85e117739eca |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/OrthancStone/Sources/Scene2D/Internals/CairoInfoPanelRenderer.cpp Tue Jul 07 16:21:02 2020 +0200 @@ -0,0 +1,132 @@ +/** + * Stone of Orthanc + * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics + * Department, University Hospital of Liege, Belgium + * Copyright (C) 2017-2020 Osimis S.A., Belgium + * + * This program is free software: you can redistribute it and/or + * modify it under the terms of the GNU Affero General Public License + * as published by the Free Software Foundation, either version 3 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Affero General Public License for more details. + * + * You should have received a copy of the GNU Affero General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + **/ + + +#include "CairoInfoPanelRenderer.h" + +#include "../InfoPanelSceneLayer.h" + +namespace OrthancStone +{ + namespace Internals + { + void CairoInfoPanelRenderer::Update(const ISceneLayer& layer) + { + const InfoPanelSceneLayer& l = dynamic_cast<const InfoPanelSceneLayer&>(layer); + + texture_.Copy(l.GetTexture(), true); + anchor_ = l.GetAnchor(); + isLinearInterpolation_ = l.IsLinearInterpolation(); + applySceneRotation_ = l.ShouldApplySceneRotation(); + } + + void CairoInfoPanelRenderer::Render(const AffineTransform2D& transform, + unsigned int canvasWidth, + unsigned int canvasHeight) + { + int dx, dy; + InfoPanelSceneLayer::ComputeAnchorLocation( + dx, dy, anchor_, texture_.GetWidth(), texture_.GetHeight(), + canvasWidth, canvasHeight); + + cairo_t* cr = target_.GetCairoContext(); + cairo_save(cr); + + if (applySceneRotation_) + { + // the transformation is as follows: + // - originally, the image is aligned so that its top left corner + // is at 0,0 + // - first, we translate the image by -w/2,-h/2 + // - then we rotate it, so that the next rotation will make the + // image rotate around its center. + // - then, we translate the image by +w/2,+h/2 to put it + // back in place + // - the fourth and last transform is the one that brings the + // image to its desired anchored location. + + int32_t halfWidth = + static_cast<int32_t>(0.5 * texture_.GetWidth()); + + int32_t halfHeight = + static_cast<int32_t>(0.5 * texture_.GetHeight()); + + AffineTransform2D translation1 = + AffineTransform2D::CreateOffset(-halfWidth, -halfHeight); + + const Matrix& sceneTransformM = transform.GetHomogeneousMatrix(); + Matrix r; + Matrix q; + LinearAlgebra::RQDecomposition3x3(r, q, sceneTransformM); + + // first, put the scene rotation in a cairo matrix + cairo_matrix_t m; + cairo_matrix_init( + &m, q(0, 0), q(1, 0), q(0, 1), q(1, 1), q(0, 2), q(1, 2)); + + // now let's build the transform piece by piece + // first translation (directly written in `transform`) + cairo_matrix_t transform; + cairo_matrix_init_identity(&transform); + cairo_matrix_translate(&transform, -halfWidth, -halfHeight); + + // then the rotation + cairo_matrix_multiply(&transform, &transform, &m); + + // then the second translation + { + cairo_matrix_t translation2; + cairo_matrix_init_translate(&translation2, halfWidth, halfHeight); + cairo_matrix_multiply(&transform, &transform, &m); + } + + // then the last translation + { + cairo_matrix_t translation3; + cairo_matrix_init_translate(&translation3, dx, dy); + cairo_matrix_multiply(&transform, &transform, &translation3); + } + cairo_transform(cr, &transform); + } + else + { + cairo_matrix_t t; + cairo_matrix_init_identity(&t); + cairo_matrix_translate(&t, dx, dy); + cairo_transform(cr, &t); + } + cairo_set_operator(cr, CAIRO_OPERATOR_OVER); + cairo_set_source_surface(cr, texture_.GetObject(), 0, 0); + + if (isLinearInterpolation_) + { + cairo_pattern_set_filter(cairo_get_source(cr), CAIRO_FILTER_BILINEAR); + } + else + { + cairo_pattern_set_filter(cairo_get_source(cr), CAIRO_FILTER_NEAREST); + } + + cairo_paint(cr); + + cairo_restore(cr); + } + } +}