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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:24:48 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:24:48 +0000 |
commit | cca66b9ec4e494c1d919bff0f71a820d8afab1fa (patch) | |
tree | 146f39ded1c938019e1ed42d30923c2ac9e86789 /src/util/preview.cpp | |
parent | Initial commit. (diff) | |
download | inkscape-cca66b9ec4e494c1d919bff0f71a820d8afab1fa.tar.xz inkscape-cca66b9ec4e494c1d919bff0f71a820d8afab1fa.zip |
Adding upstream version 1.2.2.upstream/1.2.2upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | src/util/preview.cpp | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/src/util/preview.cpp b/src/util/preview.cpp new file mode 100644 index 0000000..4dd3283 --- /dev/null +++ b/src/util/preview.cpp @@ -0,0 +1,112 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/** + * @file + * Utility functions for generating export previews. + */ +/* Authors: + * Anshudhar Kumar Singh <anshudhar2001@gmail.com> + * Martin Owens <doctormo@gmail.com> + * + * Copyright (C) 2021 Anshudhar Kumar Singh + * 2021 Martin Owens + * + * Released under GNU GPL v2+, read the file 'COPYING' for more information. + */ + +#include "preview.h" + +#include "desktop.h" +#include "document.h" +#include "display/cairo-utils.h" +#include "display/drawing-context.h" +#include "object/sp-namedview.h" +#include "object/sp-root.h" +#include "page-manager.h" + +namespace Inkscape { +namespace UI { +namespace PREVIEW { + +GdkPixbuf *render_preview(SPDocument *doc, Inkscape::Drawing &drawing, SPItem *item, + unsigned width_in, unsigned height_in, Geom::OptRect *dboxIn) +{ + if (auto name = (item ? item->getId() : nullptr)) { + // Get item even if it's in another document. + if (item->document != doc) { + item = dynamic_cast<SPItem *>(doc->getObjectById(name)); + } + } + + Geom::OptRect dbox; + if (dboxIn) { + dbox = *dboxIn; + } else if (item) { + if (item->parent) { + dbox = item->documentVisualBounds(); + } else { + dbox = doc->preferredBounds(); + } + } else if (doc->getRoot()) { + // If we still dont have a dbox we will use document coordinates. + dbox = doc->getRoot()->documentVisualBounds(); + } + + // If we still dont have anything to render then return + if (!dbox) return nullptr; + + // Calculate a scaling factor for the requested bounding box. + double sf = 1.0; + Geom::IntRect ibox = dbox->roundOutwards(); + if (ibox.width() != width_in || ibox.height() != height_in) { + sf = std::min((double)width_in / dbox->width(), + (double)height_in / dbox->height()); + auto scaled_box = *dbox * Geom::Scale(sf); + ibox = scaled_box.roundOutwards(); + } + + // Resize the contents to the available space with a scale factor + drawing.root()->setTransform(Geom::Scale(sf)); + drawing.update(); + + Geom::IntPoint pdim(width_in, height_in); + // The unsigned width/height can wrap around when negative. + int dx = ((int)width_in - ibox.width()) / 2; + int dy = ((int)height_in - ibox.height()) / 2; + Geom::IntRect area = Geom::IntRect::from_xywh(ibox.min() - Geom::IntPoint(dx, dy), pdim); + + /* Actual renderable area */ + Geom::IntRect ua = *Geom::intersect(ibox, area); + + /* Render */ + cairo_surface_t *s = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, ua.width(), ua.height()); + Inkscape::DrawingContext dc(s, ua.min()); + cairo_t *cr = cairo_create(s); + cairo_rectangle(cr, 0, 0, ua.width(), ua.height()); + + guint32 bg = doc->getPageManager().background_color; + + // We always use checkerboard to indicate transparency. + if (SP_RGBA32_A_F(bg) < 1.0) { + auto pattern = ink_cairo_pattern_create_checkerboard(bg, false); + auto background = Cairo::RefPtr<Cairo::Pattern>(new Cairo::Pattern(pattern)); + cairo_set_source(cr, background->cobj()); + cairo_fill(cr); + } + // We always draw the background on top to indicate partial backgrounds + auto background = Cairo::SolidPattern::create_rgba( + SP_RGBA32_R_F(bg), SP_RGBA32_G_F(bg), + SP_RGBA32_B_F(bg), SP_RGBA32_A_F(bg)); + cairo_set_source(cr, background->cobj()); + cairo_fill(cr); + + cairo_save(cr); + cairo_destroy(cr); + + drawing.render(dc, ua); + cairo_surface_flush(s); + return ink_pixbuf_create_from_cairo_surface(s); +} + +} // namespace PREVIEW +} // namespace UI +} // namespace Inkscape |