1 files changed, 254 insertions, 0 deletions
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 <tweenk.pl@gmail.com>
+ *
+ * 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<guint32 const *>(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 :