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Diffstat (limited to '')
| -rw-r--r-- | vcl/unx/gtk3/gtkcairo.cxx | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/vcl/unx/gtk3/gtkcairo.cxx b/vcl/unx/gtk3/gtkcairo.cxx new file mode 100644 index 000000000..202e3244d --- /dev/null +++ b/vcl/unx/gtk3/gtkcairo.cxx @@ -0,0 +1,128 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/* + * This file is part of the LibreOffice project. + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. + */ + +#include "gtkcairo.hxx" + +#include <vcl/sysdata.hxx> +#include <vcl/virdev.hxx> + +#include <unx/gtk/gtkgdi.hxx> + +namespace +{ + Size get_surface_size(cairo_surface_t *surface) + { + cairo_t *cr = cairo_create(surface); + double x1, x2, y1, y2; + cairo_clip_extents(cr, &x1, &y1, &x2, &y2); + cairo_destroy(cr); + return Size(x2 - x1, y2 - y1); + } +} + +namespace cairo +{ + /** + * Surface::Surface: Create generic Canvas surface using given Cairo Surface + * + * @param pSurface Cairo Surface + * + * This constructor only stores data, it does no processing. + * It is used with e.g. cairo_image_surface_create_for_data() + * + * Set the mpSurface as pSurface + **/ + Gtk3Surface::Gtk3Surface(const CairoSurfaceSharedPtr& pSurface) + : mpGraphics(nullptr) + , cr(nullptr) + , mpSurface(pSurface) + {} + + /** + * Surface::Surface: Create Canvas surface from Window reference. + * @param x horizontal location of the new surface + * @param y vertical location of the new surface + * @param width width of the new surface + * @param height height of the new surface + * + * Set the mpSurface to the new surface or NULL + **/ + Gtk3Surface::Gtk3Surface(const GtkSalGraphics* pGraphics, int x, int y, int width, int height) + : mpGraphics(pGraphics) + , cr(pGraphics->getCairoContext()) + { + cairo_surface_t* surface = cairo_get_target(cr); + mpSurface.reset( + cairo_surface_create_for_rectangle(surface, x, y, width, height), + &cairo_surface_destroy); + } + + Gtk3Surface::~Gtk3Surface() + { + if (cr) + cairo_destroy(cr); + } + + /** + * Surface::getCairo: Create Cairo (drawing object) for the Canvas surface + * + * @return new Cairo or NULL + **/ + CairoSharedPtr Gtk3Surface::getCairo() const + { + return CairoSharedPtr( cairo_create(mpSurface.get()), + &cairo_destroy ); + } + + /** + * Surface::getSimilar: Create new similar Canvas surface + * @param cairo_content_type format of the new surface (cairo_content_t from cairo/src/cairo.h) + * @param width width of the new surface + * @param height height of the new surface + * + * Creates a new Canvas surface. This normally creates platform native surface, even though + * generic function is used. + * + * Cairo surface from cairo_content_type (cairo_content_t) + * + * @return new surface or NULL + **/ + SurfaceSharedPtr Gtk3Surface::getSimilar(int cairo_content_type, int width, int height ) const + { + return std::make_shared<Gtk3Surface>( + CairoSurfaceSharedPtr( + cairo_surface_create_similar( mpSurface.get(), + static_cast<cairo_content_t>(cairo_content_type), width, height ), + &cairo_surface_destroy )); + } + + void Gtk3Surface::flush() const + { + cairo_surface_flush(mpSurface.get()); + //Wonder if there is any benefit in using cairo_fill/stroke extents on + //every canvas call and only redrawing the union of those in a + //poor-mans-damage tracking + if (mpGraphics) + mpGraphics->WidgetQueueDraw(); + } + + VclPtr<VirtualDevice> Gtk3Surface::createVirtualDevice() const + { + SystemGraphicsData aSystemGraphicsData; + + aSystemGraphicsData.nSize = sizeof(SystemGraphicsData); + aSystemGraphicsData.pSurface = mpSurface.get(); + + return VclPtr<VirtualDevice>::Create(aSystemGraphicsData, + get_surface_size(mpSurface.get()), + DeviceFormat::DEFAULT); + } +} + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |