Merge rendering cache branch (GSoC 2011)

(bzr r10579)

1 files changed, 264 insertions, 0 deletions

diff --git a/src/display/drawing-image.cpp b/src/display/drawing-image.cpp
new file mode 100644
index 000000000..fa0402699
--- /dev/null
+++ b/src/display/drawing-image.cpp
@@ -0,0 +1,264 @@
+/**
+ * @file
+ * @brief Bitmap image belonging to an SVG drawing
+ *//*
+ * Authors:
+ *   Krzysztof Kosiński <tweenk.pl@gmail.com>
+ *
+ * Copyright (C) 2011 Authors
+ * Released under GNU GPL, read the file 'COPYING' for more information
+ */
+
+#include "display/cairo-utils.h"
+#include "display/drawing.h"
+#include "display/drawing-context.h"
+#include "display/drawing-image.h"
+#include "preferences.h"
+#include "style.h"
+
+namespace Inkscape {
+
+DrawingImage::DrawingImage(Drawing &drawing)
+    : DrawingItem(drawing)
+    , _pixbuf(NULL)
+    , _surface(NULL)
+    , _style(NULL)
+{}
+
+DrawingImage::~DrawingImage()
+{
+    if (_style)
+        sp_style_unref(_style);
+    if (_pixbuf) {
+        cairo_surface_destroy(_surface);
+        g_object_unref(_pixbuf);
+    }
+}
+
+void
+DrawingImage::setARGB32Pixbuf(GdkPixbuf *pb)
+{
+    // when done in this order, it won't break if pb == image->pixbuf and the refcount is 1
+    if (pb != NULL) {
+        g_object_ref (pb);
+    }
+    if (_pixbuf != NULL) {
+        g_object_unref(_pixbuf);
+        cairo_surface_destroy(_surface);
+    }
+    _pixbuf = pb;
+    _surface = pb ? ink_cairo_surface_create_for_argb32_pixbuf(pb) : NULL;
+
+    _markForUpdate(STATE_ALL, false);
+}
+
+void
+DrawingImage::setStyle(SPStyle *style)
+{
+    _setStyleCommon(_style, style);
+}
+
+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 = gdk_pixbuf_get_width(_pixbuf);
+    double ph = gdk_pixbuf_get_height(_pixbuf);
+    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 &ct, Geom::IntRect const &area, unsigned flags, DrawingItem *stop_at)
+{
+    bool outline = _drawing.outline();
+
+    if (!outline) {
+        if (!_pixbuf) return RENDER_OK;
+
+        Inkscape::DrawingContext::Save save(ct);
+        ct.transform(_ctm);
+        ct.newPath();
+        ct.rectangle(_clipbox);
+        ct.clip();
+
+        ct.translate(_origin);
+        ct.scale(_scale);
+        ct.setSource(_surface, 0, 0);
+
+        cairo_matrix_t tt;
+        Geom::Affine total;
+        cairo_get_matrix(ct.raw(), &tt);
+        ink_matrix_to_2geom(total, tt);
+
+        if (total.expansionX() > 1.0 || total.expansionY() > 1.0) {
+            cairo_pattern_t *p = cairo_get_source(ct.raw());
+            cairo_pattern_set_filter(p, CAIRO_FILTER_NEAREST);
+        }
+        //ct.paint(_opacity);
+        ct.paint();
+
+    } else { // outline; draw a rect instead
+        Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+        guint32 rgba = prefs->getInt("/options/wireframecolors/images", 0xff0000ff);
+
+        {   Inkscape::DrawingContext::Save save(ct);
+            ct.transform(_ctm);
+            ct.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);
+
+            ct.moveTo(c00);
+            // the box
+            ct.lineTo(c10);
+            ct.lineTo(c11);
+            ct.lineTo(c01);
+            ct.lineTo(c00);
+            // the diagonals
+            ct.lineTo(c11);
+            ct.moveTo(c10);
+            ct.lineTo(c01);
+        }
+
+        ct.setLineWidth(0.5);
+        ct.setSource(rgba);
+        ct.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)
+{
+    // calculate sides of the triangle and their squares
+    double d1 = Geom::L2(p - a1);
+    double d1_2 = d1 * d1;
+    double d2 = Geom::L2(p - a2);
+    double d2_2 = d2 * d2;
+    double a = Geom::L2(a1 - a2);
+    double a_2 = a * a;
+
+    // if one of the angles at the base is > 90, return the corresponding side
+    if (d1_2 + a_2 <= d2_2) return d1;
+    if (d2_2 + a_2 <= d1_2) return d2;
+
+    // otherwise calculate the height to the base
+    double peri = (a + d1 + d2)/2;
+    return (2*sqrt(peri * (peri - a) * (peri - d1) * (peri - d2))/a);
+}
+
+DrawingItem *
+DrawingImage::_pickItem(Geom::Point const &p, double delta, unsigned /*sticky*/)
+{
+    if (!_pixbuf) return NULL;
+
+    bool outline = _drawing.outline();
+
+    if (outline) {
+        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);
+
+        // frame
+        if (distance_to_segment (p, c00, c10) < delta) return this;
+        if (distance_to_segment (p, c10, c11) < delta) return this;
+        if (distance_to_segment (p, c11, c01) < delta) return this;
+        if (distance_to_segment (p, c01, c00) < delta) return this;
+
+        // diagonals
+        if (distance_to_segment (p, c00, c11) < delta) return this;
+        if (distance_to_segment (p, c10, c01) < delta) return this;
+
+        return NULL;
+
+    } else {
+        unsigned char *const pixels = gdk_pixbuf_get_pixels(_pixbuf);
+        int width = gdk_pixbuf_get_width(_pixbuf);
+        int height = gdk_pixbuf_get_height(_pixbuf);
+        int rowstride = gdk_pixbuf_get_rowstride(_pixbuf);
+
+        Geom::Point tp = p * _ctm.inverse();
+        Geom::Rect r = bounds();
+
+        if (!r.contains(tp))
+            return NULL;
+
+        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 NULL;
+
+        unsigned char *pix_ptr = pixels + iy * rowstride + ix * 4;
+        // pick if the image is less than 99% transparent
+        float alpha = (pix_ptr[3] / 255.0f) * _opacity;
+        return alpha > 0.01 ? this : NULL;
+    }
+}
+
+} // 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 :