From cca66b9ec4e494c1d919bff0f71a820d8afab1fa Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:24:48 +0200 Subject: Adding upstream version 1.2.2. Signed-off-by: Daniel Baumann --- src/display/drawing-image.cpp | 254 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 254 insertions(+) create mode 100644 src/display/drawing-image.cpp (limited to 'src/display/drawing-image.cpp') diff --git a/src/display/drawing-image.cpp b/src/display/drawing-image.cpp new file mode 100644 index 0000000..8f6d060 --- /dev/null +++ b/src/display/drawing-image.cpp @@ -0,0 +1,254 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/** + * @file + * Bitmap image belonging to an SVG drawing. + *//* + * Authors: + * Krzysztof Kosiński + * + * Copyright (C) 2011 Authors + * Released under GNU GPL v2+, read the file 'COPYING' for more information. + */ + +#include <2geom/bezier-curve.h> + +#include "display/drawing.h" +#include "display/drawing-context.h" +#include "display/drawing-image.h" +#include "preferences.h" + +#include "display/cairo-utils.h" + +namespace Inkscape { + +DrawingImage::DrawingImage(Drawing &drawing) + : DrawingItem(drawing) + , _pixbuf(nullptr) +{} + +DrawingImage::~DrawingImage() +{ + // _pixbuf is owned by SPImage - do not delete it +} + +void +DrawingImage::setPixbuf(Inkscape::Pixbuf *pb) +{ + _pixbuf = pb; + + _markForUpdate(STATE_ALL, false); +} + +void +DrawingImage::setScale(double sx, double sy) +{ + _scale = Geom::Scale(sx, sy); + _markForUpdate(STATE_ALL, false); +} + +void +DrawingImage::setOrigin(Geom::Point const &o) +{ + _origin = o; + _markForUpdate(STATE_ALL, false); +} + +void +DrawingImage::setClipbox(Geom::Rect const &box) +{ + _clipbox = box; + _markForUpdate(STATE_ALL, false); +} + +Geom::Rect +DrawingImage::bounds() const +{ + if (!_pixbuf) return _clipbox; + + double pw = _pixbuf->width(); + double ph = _pixbuf->height(); + double vw = pw * _scale[Geom::X]; + double vh = ph * _scale[Geom::Y]; + Geom::Point wh(vw, vh); + Geom::Rect view(_origin, _origin+wh); + Geom::OptRect res = _clipbox & view; + Geom::Rect ret = res ? *res : _clipbox; + + return ret; +} + +unsigned +DrawingImage::_updateItem(Geom::IntRect const &, UpdateContext const &, unsigned, unsigned) +{ + _markForRendering(); + + // Calculate bbox + if (_pixbuf) { + Geom::Rect r = bounds() * _ctm; + _bbox = r.roundOutwards(); + } else { + _bbox = Geom::OptIntRect(); + } + + return STATE_ALL; +} + +unsigned DrawingImage::_renderItem(DrawingContext &dc, Geom::IntRect const &/*area*/, unsigned /*flags*/, DrawingItem * /*stop_at*/) +{ + bool outline = _drawing.outline(); + + Inkscape::Preferences *prefs = Inkscape::Preferences::get(); + bool imgoutline = prefs->getBool("/options/rendering/imageinoutlinemode", false); + + if (!outline || imgoutline) { + if (!_pixbuf) return RENDER_OK; + + Inkscape::DrawingContext::Save save(dc); + dc.transform(_ctm); + dc.newPath(); + dc.rectangle(_clipbox); + dc.clip(); + + dc.translate(_origin); + dc.scale(_scale); + dc.setSource(_pixbuf->getSurfaceRaw(), 0, 0); + dc.patternSetExtend(CAIRO_EXTEND_PAD); + + if (_style) { + // See: http://www.w3.org/TR/SVG/painting.html#ImageRenderingProperty + // https://drafts.csswg.org/css-images-3/#the-image-rendering + // style.h/style.cpp, cairo-render-context.cpp + // + // CSS 3 defines: + // 'optimizeSpeed' as alias for "pixelated" + // 'optimizeQuality' as alias for "smooth" + switch (_style->image_rendering.computed) { + case SP_CSS_IMAGE_RENDERING_OPTIMIZESPEED: + case SP_CSS_IMAGE_RENDERING_PIXELATED: + // we don't have an implementation for crisp-edges, but it should *not* smooth or blur + case SP_CSS_IMAGE_RENDERING_CRISPEDGES: + dc.patternSetFilter( CAIRO_FILTER_NEAREST ); + break; + case SP_CSS_IMAGE_RENDERING_AUTO: + case SP_CSS_IMAGE_RENDERING_OPTIMIZEQUALITY: + default: + // In recent Cairo, BEST used Lanczos3, which is prohibitively slow + dc.patternSetFilter( CAIRO_FILTER_GOOD ); + break; + } + } + + dc.paint(1); + + } else { // outline; draw a rect instead + + guint32 rgba = prefs->getInt("/options/wireframecolors/images", 0xff0000ff); + + { Inkscape::DrawingContext::Save save(dc); + dc.transform(_ctm); + dc.newPath(); + + Geom::Rect r = bounds(); + Geom::Point c00 = r.corner(0); + Geom::Point c01 = r.corner(3); + Geom::Point c11 = r.corner(2); + Geom::Point c10 = r.corner(1); + + dc.moveTo(c00); + // the box + dc.lineTo(c10); + dc.lineTo(c11); + dc.lineTo(c01); + dc.lineTo(c00); + // the diagonals + dc.lineTo(c11); + dc.moveTo(c10); + dc.lineTo(c01); + } + + dc.setLineWidth(0.5); + dc.setSource(rgba); + dc.stroke(); + } + return RENDER_OK; +} + +/** Calculates the closest distance from p to the segment a1-a2*/ +static double +distance_to_segment (Geom::Point const &p, Geom::Point const &a1, Geom::Point const &a2) +{ + Geom::LineSegment l(a1, a2); + Geom::Point np = l.pointAt(l.nearestTime(p)); + return Geom::distance(np, p); +} + +DrawingItem * +DrawingImage::_pickItem(Geom::Point const &p, double delta, unsigned /*sticky*/) +{ + if (!_pixbuf) return nullptr; + + bool outline = _drawing.outline() || _drawing.outlineOverlay() || _drawing.getOutlineSensitive(); + + if (outline) { + Geom::Rect r = bounds(); + Geom::Point pick = p * _ctm.inverse(); + + // find whether any side or diagonal is within delta + // to do so, iterate over all pairs of corners + for (unsigned i = 0; i < 3; ++i) { // for i=3, there is nothing to do + for (unsigned j = i+1; j < 4; ++j) { + if (distance_to_segment(pick, r.corner(i), r.corner(j)) < delta) { + return this; + } + } + } + return nullptr; + + } else { + unsigned char *const pixels = _pixbuf->pixels(); + int width = _pixbuf->width(); + int height = _pixbuf->height(); + size_t rowstride = _pixbuf->rowstride(); + + Geom::Point tp = p * _ctm.inverse(); + Geom::Rect r = bounds(); + + if (!r.contains(tp)) + return nullptr; + + double vw = width * _scale[Geom::X]; + double vh = height * _scale[Geom::Y]; + int ix = floor((tp[Geom::X] - _origin[Geom::X]) / vw * width); + int iy = floor((tp[Geom::Y] - _origin[Geom::Y]) / vh * height); + + if ((ix < 0) || (iy < 0) || (ix >= width) || (iy >= height)) + return nullptr; + + unsigned char *pix_ptr = pixels + iy * rowstride + ix * 4; + // pick if the image is less than 99% transparent + guint32 alpha = 0; + if (_pixbuf->pixelFormat() == Inkscape::Pixbuf::PF_CAIRO) { + guint32 px = *reinterpret_cast(pix_ptr); + alpha = (px & 0xff000000) >> 24; + } else if (_pixbuf->pixelFormat() == Inkscape::Pixbuf::PF_GDK) { + alpha = pix_ptr[3]; + } else { + throw std::runtime_error("Unrecognized pixel format"); + } + float alpha_f = (alpha / 255.0f) * _opacity; + return alpha_f > 0.01 ? this : nullptr; + } +} + +} // end namespace Inkscape + +/* + Local Variables: + mode:c++ + c-file-style:"stroustrup" + c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +)) + indent-tabs-mode:nil + fill-column:99 + End: +*/ +// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 : -- cgit v1.2.3