Mercurial > hg > orthanc-stone
view OrthancStone/Sources/Scene2D/Internals/CairoTextRenderer.cpp @ 1852:5ead1852095a StoneWebViewer-2.1
StoneWebViewer-2.1
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Tue, 29 Jun 2021 16:26:47 +0200 |
parents | 9ac2a65d4172 |
children | 3889ae96d2e9 |
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/** * Stone of Orthanc * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics * Department, University Hospital of Liege, Belgium * Copyright (C) 2017-2021 Osimis S.A., Belgium * * This program is free software: you can redistribute it and/or * modify it under the terms of the GNU Lesser 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this program. If not, see * <http://www.gnu.org/licenses/>. **/ #include "CairoTextRenderer.h" #include <OrthancException.h> namespace OrthancStone { namespace Internals { CairoTextRenderer::CairoTextRenderer(ICairoContextProvider& target, const GlyphBitmapAlphabet& alphabet, const TextSceneLayer& layer) : CairoBaseRenderer(target, layer) { std::unique_ptr<Orthanc::ImageAccessor> source(alphabet.RenderText(layer.GetText())); if (source.get() != NULL) { text_.SetSize(source->GetWidth(), source->GetHeight(), true); Orthanc::ImageAccessor accessor; text_.GetWriteableAccessor(accessor); if (source->GetFormat() != Orthanc::PixelFormat_Grayscale8 || accessor.GetFormat() != Orthanc::PixelFormat_BGRA32) { throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError); } const unsigned int height = source->GetHeight(); const unsigned int width = source->GetWidth(); const Color& color = layer.GetColor(); for (unsigned int y = 0; y < height; y++) { const uint8_t* p = reinterpret_cast<const uint8_t*>(source->GetConstRow(y)); uint8_t* q = reinterpret_cast<uint8_t*>(accessor.GetRow(y)); for (unsigned int x = 0; x < width; x++) { unsigned int alpha = *p; // Premultiplied alpha q[0] = static_cast<uint8_t>((color.GetBlue() * alpha) / 255); q[1] = static_cast<uint8_t>((color.GetGreen() * alpha) / 255); q[2] = static_cast<uint8_t>((color.GetRed() * alpha) / 255); q[3] = *p; p++; q += 4; } } cairo_surface_mark_dirty(text_.GetObject()); } } void CairoTextRenderer::Render(const AffineTransform2D& transform, unsigned int canvasWidth, unsigned int canvasHeight) { if (text_.GetWidth() != 0 && text_.GetHeight() != 0) { const TextSceneLayer& layer = GetLayer<TextSceneLayer>(); cairo_t* cr = GetCairoContext(); cairo_set_source_rgb(cr, layer.GetColor().GetRedAsFloat(), layer.GetColor().GetGreenAsFloat(), layer.GetColor().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); } } } }