Mercurial > hg > orthanc-stone
view OrthancStone/Sources/Wrappers/CairoContext.cpp @ 1851:739a69562826
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author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Tue, 29 Jun 2021 14:25:58 +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 "CairoContext.h" #include <Logging.h> #include <OrthancException.h> namespace OrthancStone { CairoContext::CairoContext(CairoSurface& surface) : width_(surface.GetWidth()), height_(surface.GetHeight()) { context_ = cairo_create(surface.GetObject()); if (!context_) { LOG(ERROR) << "Cannot create Cairo drawing context"; throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError); } } CairoContext::~CairoContext() { if (context_ != NULL) { cairo_destroy(context_); context_ = NULL; } } void CairoContext::SetSourceColor(uint8_t red, uint8_t green, uint8_t blue) { cairo_set_source_rgb(context_, static_cast<float>(red) / 255.0f, static_cast<float>(green) / 255.0f, static_cast<float>(blue) / 255.0f); } class CairoContext::AlphaSurface : public boost::noncopyable { private: cairo_surface_t *surface_; public: AlphaSurface(unsigned int width, unsigned int height) { surface_ = cairo_image_surface_create(CAIRO_FORMAT_A8, width, height); if (!surface_) { // Should never occur throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError); } if (cairo_surface_status(surface_) != CAIRO_STATUS_SUCCESS) { LOG(ERROR) << "Cannot create a Cairo surface"; cairo_surface_destroy(surface_); throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError); } } ~AlphaSurface() { cairo_surface_destroy(surface_); } void GetAccessor(Orthanc::ImageAccessor& target) { target.AssignWritable(Orthanc::PixelFormat_Grayscale8, cairo_image_surface_get_width(surface_), cairo_image_surface_get_height(surface_), cairo_image_surface_get_stride(surface_), cairo_image_surface_get_data(surface_)); } void Blit(cairo_t* cr, double x, double y) { cairo_surface_mark_dirty(surface_); cairo_mask_surface(cr, surface_, x, y); cairo_fill(cr); } }; void CairoContext::DrawText(const Orthanc::Font& font, const std::string& text, double x, double y, BitmapAnchor anchor) { // Render a bitmap containing the text unsigned int width, height; font.ComputeTextExtent(width, height, text); AlphaSurface surface(width, height); Orthanc::ImageAccessor accessor; surface.GetAccessor(accessor); font.Draw(accessor, text, 0, 0, 255); // Correct the text location given the anchor location double deltaX, deltaY; ComputeAnchorTranslation(deltaX, deltaY, anchor, width, height); // Cancel zoom/rotation before blitting the text onto the surface double pixelX = x; double pixelY = y; cairo_user_to_device(context_, &pixelX, &pixelY); cairo_save(context_); cairo_identity_matrix(context_); // Blit the text bitmap surface.Blit(context_, pixelX + deltaX, pixelY + deltaY); cairo_restore(context_); } }