Mercurial > hg > orthanc-stone
diff Framework/Scene2D/Internals/CairoTextRenderer.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 | 61ba4b504e9a |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/Framework/Scene2D/Internals/CairoTextRenderer.cpp Fri Apr 26 17:28:18 2019 +0200 @@ -0,0 +1,114 @@ +/** + * 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 "CairoTextRenderer.h" + +#include <Core/OrthancException.h> + +namespace OrthancStone +{ + namespace Internals + { + CairoTextRenderer::CairoTextRenderer(ICairoContextProvider& target, + const GlyphBitmapAlphabet& alphabet, + const TextSceneLayer& layer) : + CairoBaseRenderer(target, layer) + { + std::auto_ptr<Orthanc::ImageAccessor> source(alphabet.RenderText(layer.GetText())); + + if (source.get() != NULL) + { + text_.SetSize(source->GetWidth(), source->GetHeight(), true); + + Orthanc::ImageAccessor target; + text_.GetWriteableAccessor(target); + + if (source->GetFormat() != Orthanc::PixelFormat_Grayscale8 || + target.GetFormat() != Orthanc::PixelFormat_BGRA32) + { + throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError); + } + + const unsigned int width = source->GetWidth(); + const unsigned int red = layer.GetRed(); + const unsigned int green = layer.GetGreen(); + const unsigned int blue = layer.GetBlue(); + + for (unsigned int y = 0; y < source->GetHeight(); y++) + { + const uint8_t* p = reinterpret_cast<const uint8_t*>(source->GetConstRow(y)); + uint8_t* q = reinterpret_cast<uint8_t*>(target.GetRow(y)); + + for (unsigned int x = 0; x < width; x++) + { + unsigned int alpha = *p; + + // Premultiplied alpha + q[0] = static_cast<uint8_t>((blue * alpha) / 255); + q[1] = static_cast<uint8_t>((green * alpha) / 255); + q[2] = static_cast<uint8_t>((red * alpha) / 255); + q[3] = *p; + + p++; + q += 4; + } + } + + cairo_surface_mark_dirty(text_.GetObject()); + } + } + + + void CairoTextRenderer::Render(const AffineTransform2D& transform) + { + if (text_.GetWidth() != 0 && + text_.GetHeight() != 0) + { + const TextSceneLayer& layer = GetLayer<TextSceneLayer>(); + + cairo_t* cr = GetCairoContext(); + cairo_set_source_rgb(cr, layer.GetRedAsFloat(), layer.GetGreenAsFloat(), layer.GetBlueAsFloat()); + + double dx, dy; // In pixels + ComputeAnchorTranslation(dx, dy, layer.GetAnchor(), text_.GetWidth(), + text_.GetHeight(), layer.GetBorder()); + + double x = layer.GetX(); + double y = layer.GetY(); + transform.Apply(x, y); + + cairo_save(cr); + + cairo_matrix_t t; + cairo_matrix_init_identity(&t); + cairo_matrix_translate(&t, x + dx, y + dy); + cairo_transform(cr, &t); + + cairo_set_operator(cr, CAIRO_OPERATOR_OVER); + cairo_set_source_surface(cr, text_.GetObject(), 0, 0); + cairo_pattern_set_filter(cairo_get_source(cr), CAIRO_FILTER_BILINEAR); + cairo_paint(cr); + + cairo_restore(cr); + } + } + } +}