Mercurial > hg > orthanc-stone
diff Framework/Scene2D/Internals/CairoFloatTextureRenderer.cpp @ 597:9e51fb773bbd
CairoCompositor
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Fri, 26 Apr 2019 17:28:18 +0200 |
parents | |
children | 55411e7da2f7 cfb4d39065a4 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/Framework/Scene2D/Internals/CairoFloatTextureRenderer.cpp Fri Apr 26 17:28:18 2019 +0200 @@ -0,0 +1,116 @@ +/** + * Stone of Orthanc + * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics + * Department, University Hospital of Liege, Belgium + * Copyright (C) 2017-2019 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 "CairoFloatTextureRenderer.h" + +#include "../FloatTextureSceneLayer.h" + +namespace OrthancStone +{ + namespace Internals + { + void CairoFloatTextureRenderer::Update(const ISceneLayer& layer) + { + const FloatTextureSceneLayer& l = dynamic_cast<const FloatTextureSceneLayer&>(layer); + + textureTransform_ = l.GetTransform(); + isLinearInterpolation_ = l.IsLinearInterpolation(); + + float windowCenter, windowWidth; + l.GetWindowing(windowCenter, windowWidth); + + const float a = windowCenter - windowWidth; + const float slope = 256.0f / (2.0f * windowWidth); + + const Orthanc::ImageAccessor& source = l.GetTexture(); + const unsigned int width = source.GetWidth(); + const unsigned int height = source.GetHeight(); + texture_.SetSize(width, height, false); + + Orthanc::ImageAccessor target; + texture_.GetWriteableAccessor(target); + + assert(source.GetFormat() == Orthanc::PixelFormat_Float32 && + target.GetFormat() == Orthanc::PixelFormat_BGRA32 && + sizeof(float) == 4); + + for (unsigned int y = 0; y < height; y++) + { + const float* p = reinterpret_cast<const float*>(source.GetConstRow(y)); + uint8_t* q = reinterpret_cast<uint8_t*>(target.GetRow(y)); + + for (unsigned int x = 0; x < width; x++) + { + float v = (*p - a) * slope; + if (v <= 0) + { + v = 0; + } + else if (v >= 255) + { + v = 255; + } + + uint8_t vv = static_cast<uint8_t>(v); + + q[0] = vv; + q[1] = vv; + q[2] = vv; + + p++; + q += 4; + } + } + } + + + void CairoFloatTextureRenderer::Render(const AffineTransform2D& transform) + { + cairo_t* cr = target_.GetCairoContext(); + + AffineTransform2D t = + AffineTransform2D::Combine(transform, textureTransform_); + Matrix h = t.GetHomogeneousMatrix(); + + cairo_save(cr); + + cairo_matrix_t m; + cairo_matrix_init(&m, h(0, 0), h(1, 0), h(0, 1), h(1, 1), h(0, 2), h(1, 2)); + cairo_transform(cr, &m); + + 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); + } + } +}