Implement clipping (slightly incorrect) and masking

(bzr r9508.1.4)

1 files changed, 113 insertions, 0 deletions

diff --git a/src/display/cairo-utils.cpp b/src/display/cairo-utils.cpp
new file mode 100644
index 000000000..58db5d551
--- /dev/null
+++ b/src/display/cairo-utils.cpp
@@ -0,0 +1,113 @@
+/*
+ * Helper functions to use cairo with inkscape
+ *
+ * Copyright (C) 2007 bulia byak
+ * Copyright (C) 2008 Johan Engelen
+ *
+ * Released under GNU GPL
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <stdexcept>
+#include <cairo.h>
+#include <2geom/matrix.h>
+#include "display/cairo-utils.h"
+#include "display/inkscape-cairo.h"
+#include "color.h"
+
+namespace Inkscape {
+
+CairoGroup::CairoGroup(cairo_t *_ct) : ct(_ct), pushed(false) {}
+CairoGroup::~CairoGroup() {
+    if (pushed) {
+        cairo_pattern_t *p = cairo_pop_group(ct);
+        cairo_pattern_destroy(p);
+    }
+}
+void CairoGroup::push() {
+    cairo_push_group(ct);
+    pushed = true;
+}
+void CairoGroup::push_with_content(cairo_content_t content) {
+    cairo_push_group_with_content(ct, content);
+    pushed = true;
+}
+cairo_pattern_t *CairoGroup::pop() {
+    if (pushed) {
+        cairo_pattern_t *ret = cairo_pop_group(ct);
+        pushed = false;
+        return ret;
+    } else {
+        throw std::logic_error("Cairo group popped without pushing it first");
+    }
+}
+Cairo::RefPtr<Cairo::Pattern> CairoGroup::popmm() {
+    if (pushed) {
+        cairo_pattern_t *ret = cairo_pop_group(ct);
+        Cairo::RefPtr<Cairo::Pattern> retmm(new Cairo::Pattern(ret, true));
+        pushed = false;
+        return retmm;
+    } else {
+        throw std::logic_error("Cairo group popped without pushing it first");
+    }
+}
+void CairoGroup::pop_to_source() {
+    if (pushed) {
+        cairo_pop_group_to_source(ct);
+        pushed = false;
+    }
+}
+
+CairoContext::CairoContext(cairo_t *obj, bool ref)
+    : Cairo::Context(obj, ref)
+{}
+
+void CairoContext::transform(Geom::Matrix const &m)
+{
+    cairo_matrix_t cm;
+    cm.xx = m[0];
+    cm.xy = m[2];
+    cm.x0 = m[4];
+    cm.yx = m[1];
+    cm.yy = m[3];
+    cm.y0 = m[5];
+    cairo_transform(cobj(), &cm);
+}
+
+void CairoContext::set_source_rgba32(guint32 color)
+{
+    double red = SP_RGBA32_R_F(color);
+    double gre = SP_RGBA32_G_F(color);
+    double blu = SP_RGBA32_B_F(color);
+    double alp = SP_RGBA32_A_F(color);
+    cairo_set_source_rgba(cobj(), red, gre, blu, alp);
+}
+
+void CairoContext::append_path(Geom::PathVector const &pv)
+{
+    feed_pathvector_to_cairo(cobj(), pv);
+}
+
+Cairo::RefPtr<CairoContext> CairoContext::create(Cairo::RefPtr<Cairo::Surface> const &target)
+{
+    cairo_t *ct = cairo_create(target->cobj());
+    Cairo::RefPtr<CairoContext> ret(new CairoContext(ct, true));
+    return ret;
+}
+
+} // 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:encoding=utf-8:textwidth=99 :