Adding upstream version 1.2.2.upstream/1.2.2upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 328 insertions, 0 deletions

diff --git a/src/object/viewbox.cpp b/src/object/viewbox.cpp
new file mode 100644
index 0000000..eee0fc5
--- /dev/null
+++ b/src/object/viewbox.cpp
@@ -0,0 +1,328 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * viewBox helper class, common code used by root, symbol, marker, pattern, image, view
+ *
+ * Authors:
+ *   Lauris Kaplinski <lauris@kaplinski.com> (code extracted from symbol.cpp)
+ *   Tavmjong Bah <tavmjong@free.fr>
+ *   Johan Engelen
+ *
+ * Copyright (C) 2013-2014 Tavmjong Bah, authors
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ *
+ */
+
+#include <2geom/transforms.h>
+
+#include "viewbox.h"
+#include "enums.h"
+#include "sp-item.h"
+#include "svg/stringstream.h"
+
+#include <map>
+
+namespace {
+std::map<unsigned int, char const *> const ASPECT_ALIGN_STRINGS{
+    {SP_ASPECT_NONE, "none"},          //
+    {SP_ASPECT_XMIN_YMIN, "xMinYMin"}, //
+    {SP_ASPECT_XMID_YMIN, "xMidYMin"}, //
+    {SP_ASPECT_XMAX_YMIN, "xMaxYMin"}, //
+    {SP_ASPECT_XMIN_YMID, "xMinYMid"}, //
+    {SP_ASPECT_XMID_YMID, "xMidYMid"}, //
+    {SP_ASPECT_XMAX_YMID, "xMaxYMid"}, //
+    {SP_ASPECT_XMIN_YMAX, "xMinYMax"}, //
+    {SP_ASPECT_XMID_YMAX, "xMidYMax"}, //
+    {SP_ASPECT_XMAX_YMAX, "xMaxYMax"}, //
+};
+}
+
+SPViewBox::SPViewBox()
+    : viewBox_set(false)
+    , viewBox()
+    , aspect_set(false)
+    , aspect_align(SP_ASPECT_XMID_YMID) // Default per spec
+    , aspect_clip(SP_ASPECT_MEET)
+    , c2p(Geom::identity())
+{
+}
+
+void SPViewBox::set_viewBox(const gchar* value) {
+
+  if (value) {
+    gchar *eptr = const_cast<gchar*>(value); // const-cast necessary because of const-incorrect interface definition of g_ascii_strtod
+
+    double x = g_ascii_strtod (eptr, &eptr);
+
+    while (*eptr && ((*eptr == ',') || (*eptr == ' '))) {
+      eptr++;
+    }
+
+    double y = g_ascii_strtod (eptr, &eptr);
+
+    while (*eptr && ((*eptr == ',') || (*eptr == ' '))) {
+      eptr++;
+    }
+
+    double width = g_ascii_strtod (eptr, &eptr);
+
+    while (*eptr && ((*eptr == ',') || (*eptr == ' '))) {
+      eptr++;
+    }
+
+    double height = g_ascii_strtod (eptr, &eptr);
+
+    while (*eptr && ((*eptr == ',') || (*eptr == ' '))) {
+      eptr++;
+    }
+
+    if ((width > 0) && (height > 0)) {
+      /* Set viewbox */
+      this->viewBox = Geom::Rect::from_xywh(x, y, width, height);
+      this->viewBox_set = true;
+    } else {
+      this->viewBox_set = false;
+    }
+  } else {
+    this->viewBox_set = false;
+  }
+
+  // The C++ way?  -- not necessarily using iostreams
+  // std::string sv( value );
+  // std::replace( sv.begin(), sv.end(), ',', ' ');
+  // std::stringstream ss( sv );
+  // double x, y, width, height;
+  // ss >> x >> y >> width >> height;
+}
+
+void SPViewBox::set_preserveAspectRatio(const gchar* value) {
+
+  /* Do setup before, so we can use break to escape */
+  this->aspect_set = false;
+  this->aspect_align = SP_ASPECT_XMID_YMID; // Default per spec
+  this->aspect_clip = SP_ASPECT_MEET;
+
+  if (value) {
+    const gchar *p = value;
+
+    while (*p && (*p == 32)) {
+      p += 1;
+    }
+
+    if (!*p) {
+      return;
+    }
+
+    const gchar *e = p;
+
+    while (*e && (*e != 32)) {
+      e += 1;
+    }
+
+    int len = e - p;
+
+    if (len > 8) {  // Can't have buffer overflow as 8 < 256
+      return;
+    }
+
+    gchar c[256];
+    memcpy (c, value, len);
+
+    c[len] = 0;
+
+    /* Now the actual part */
+    unsigned int align = SP_ASPECT_NONE;
+    if (!strcmp (c, "none")) {
+      align = SP_ASPECT_NONE;
+    } else if (!strcmp (c, "xMinYMin")) {
+      align = SP_ASPECT_XMIN_YMIN;
+    } else if (!strcmp (c, "xMidYMin")) {
+      align = SP_ASPECT_XMID_YMIN;
+    } else if (!strcmp (c, "xMaxYMin")) {
+      align = SP_ASPECT_XMAX_YMIN;
+    } else if (!strcmp (c, "xMinYMid")) {
+      align = SP_ASPECT_XMIN_YMID;
+    } else if (!strcmp (c, "xMidYMid")) {
+      align = SP_ASPECT_XMID_YMID;
+    } else if (!strcmp (c, "xMaxYMid")) {
+      align = SP_ASPECT_XMAX_YMID;
+    } else if (!strcmp (c, "xMinYMax")) {
+      align = SP_ASPECT_XMIN_YMAX;
+    } else if (!strcmp (c, "xMidYMax")) {
+      align = SP_ASPECT_XMID_YMAX;
+    } else if (!strcmp (c, "xMaxYMax")) {
+      align = SP_ASPECT_XMAX_YMAX;
+    } else {
+      return;
+    }
+
+    unsigned int clip = SP_ASPECT_MEET;
+
+    while (*e && (*e == 32)) {
+      e += 1;
+    }
+
+    if (*e) {
+      if (!strcmp (e, "meet")) {
+        clip = SP_ASPECT_MEET;
+      } else if (!strcmp (e, "slice")) {
+        clip = SP_ASPECT_SLICE;
+      } else {
+        return;
+      }
+    }
+
+    this->aspect_set = true;
+    this->aspect_align = align;
+    this->aspect_clip = clip;
+  }
+}
+
+// Apply scaling from viewbox
+void SPViewBox::apply_viewbox(const Geom::Rect& in, double scale_none) {
+
+    /* Determine actual viewbox in viewport coordinates */
+    // scale_none is the scale that would apply if the viewbox and page size are same size
+    // it is passed here because it is a double-precision variable, while 'in' is originally float
+    double x = 0.0;
+    double y = 0.0;
+    double scale_x = in.width() / this->viewBox.width();
+    double scale_y = in.height() / this->viewBox.height();
+    double scale_uniform = 1.0; // used only if scaling is uniform
+
+    if (Geom::are_near(scale_x / scale_y, 1.0, Geom::EPSILON)) {
+      // scaling is already uniform, reduce numerical error
+      scale_uniform = (scale_x + scale_y)/2.0;
+      if (Geom::are_near(scale_uniform / scale_none, 1.0, Geom::EPSILON))
+          scale_uniform = scale_none; // objects are same size, reduce numerical error
+      scale_x = scale_uniform;
+      scale_y = scale_uniform;
+    } else if (this->aspect_align != SP_ASPECT_NONE) {
+      // scaling is not uniform, but force it to be
+      scale_uniform = (this->aspect_clip == SP_ASPECT_MEET) ? MIN (scale_x, scale_y) : MAX (scale_x, scale_y);
+      scale_x = scale_uniform;
+      scale_y = scale_uniform;
+      double width  = this->viewBox.width()  * scale_uniform;
+      double height = this->viewBox.height() * scale_uniform;
+
+      /* Now place viewbox to requested position */
+      switch (this->aspect_align) {
+        case SP_ASPECT_XMIN_YMIN:
+          break;
+        case SP_ASPECT_XMID_YMIN:
+          x = 0.5 * (in.width() - width);
+          break;
+        case SP_ASPECT_XMAX_YMIN:
+          x = 1.0 * (in.width() - width);
+          break;
+        case SP_ASPECT_XMIN_YMID:
+          y = 0.5 * (in.height() - height);
+          break;
+        case SP_ASPECT_XMID_YMID:
+          x = 0.5 * (in.width() - width);
+          y = 0.5 * (in.height() - height);
+          break;
+        case SP_ASPECT_XMAX_YMID:
+          x = 1.0 * (in.width() - width);
+          y = 0.5 * (in.height() - height);
+          break;
+        case SP_ASPECT_XMIN_YMAX:
+          y = 1.0 * (in.height() - height);
+          break;
+        case SP_ASPECT_XMID_YMAX:
+          x = 0.5 * (in.width() - width);
+          y = 1.0 * (in.height() - height);
+          break;
+        case SP_ASPECT_XMAX_YMAX:
+          x = 1.0 * (in.width() - width);
+          y = 1.0 * (in.height() - height);
+          break;
+        default:
+          break;
+      }
+    }
+
+    /* Viewbox transform from scale and position */
+    Geom::Affine q;
+    q[0] = scale_x;
+    q[1] = 0.0;
+    q[2] = 0.0;
+    q[3] = scale_y;
+    q[4] = x - scale_x * this->viewBox.left();
+    q[5] = y - scale_y * this->viewBox.top();
+
+    // std::cout << "  q\n" << q << std::endl;
+
+    /* Append viewbox transformation */
+    this->c2p = q * this->c2p;
+}
+
+SPItemCtx SPViewBox::get_rctx(const SPItemCtx* ictx, double scale_none) {
+
+  /* Create copy of item context */
+  SPItemCtx rctx = *ictx;
+
+  /* Calculate child to parent transformation */
+  /* Apply parent translation (set up as viewport) */
+  this->c2p = Geom::Translate(rctx.viewport.min());
+
+  if (this->viewBox_set) {
+    // Adjusts c2p for viewbox
+    apply_viewbox( rctx.viewport, scale_none );
+  }
+
+  rctx.i2doc = this->c2p * rctx.i2doc;
+
+  /* If viewBox is set initialize child viewport */
+  /* Otherwise it is already correct */
+  if (this->viewBox_set) {
+    rctx.viewport = this->viewBox;
+    rctx.i2vp = Geom::identity();
+  }
+
+  return rctx;
+}
+
+/**
+ * Write viewBox attribute to XML, if set.
+ */
+void SPViewBox::write_viewBox(Inkscape::XML::Node *repr) const
+{
+    if (viewBox_set) {
+        Inkscape::SVGOStringStream os;
+        os << viewBox.left() << " "  //
+           << viewBox.top() << " "   //
+           << viewBox.width() << " " //
+           << viewBox.height();
+
+        repr->setAttribute("viewBox", os.str());
+    }
+}
+
+/**
+ * Write preserveAspectRatio attribute to XML, if set.
+ */
+void SPViewBox::write_preserveAspectRatio(Inkscape::XML::Node *repr) const
+{
+    if (aspect_set) {
+        std::string aspect = ASPECT_ALIGN_STRINGS.at(aspect_align);
+
+        if (aspect_clip == SP_ASPECT_SLICE) {
+            aspect += " slice";
+        }
+
+        repr->setAttribute("preserveAspectRatio", aspect);
+    }
+}
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-basic-offset:2
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=2:tabstop=8:softtabstop=2:fileencoding=utf-8:textwidth=99 :