diff options
Diffstat (limited to 'upstream/clipper-6.4.2/cpp/cpp_cairo/cairo_clipper.cpp')
| -rw-r--r-- | upstream/clipper-6.4.2/cpp/cpp_cairo/cairo_clipper.cpp | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/upstream/clipper-6.4.2/cpp/cpp_cairo/cairo_clipper.cpp b/upstream/clipper-6.4.2/cpp/cpp_cairo/cairo_clipper.cpp new file mode 100644 index 0000000..72d5930 --- /dev/null +++ b/upstream/clipper-6.4.2/cpp/cpp_cairo/cairo_clipper.cpp @@ -0,0 +1,133 @@ +/*******************************************************************************
+* *
+* Author : Angus Johnson *
+* Version : 1.1 *
+* Date : 4 April 2011 *
+* Copyright : Angus Johnson 2010-2011 *
+* *
+* License: *
+* Use, modification & distribution is subject to Boost Software License Ver 1. *
+* http://www.boost.org/LICENSE_1_0.txt *
+* *
+* Modified by Mike Owens to support coordinate transformation *
+*******************************************************************************/
+
+#include <stdexcept>
+#include <cmath>
+#include <iostream>
+#include <cairo.h>
+#include "clipper.hpp"
+#include "cairo_clipper.hpp"
+
+namespace ClipperLib {
+ namespace cairo {
+
+ namespace {
+
+ inline cInt Round(double val)
+ {
+ if ((val < 0)) return (cInt)(val - 0.5); else return (cInt)(val + 0.5);
+ }
+
+ void transform_point(cairo_t* pen, Transform transform, cInt* x, cInt* y)
+ {
+ double _x = (double)*x, _y = (double)*y;
+ switch (transform)
+ {
+ case tDeviceToUser:
+ cairo_device_to_user(pen, &_x, &_y);
+ break;
+ case tUserToDevice:
+ cairo_user_to_device(pen, &_x, &_y);
+ break;
+ default:
+ ;
+ }
+ *x = Round(_x); *y = Round(_y);
+ }
+ }
+
+ void cairo_to_clipper(cairo_t* cr,
+ Paths &pg,
+ int scaling_factor,
+ Transform transform)
+ {
+ if (scaling_factor > 8 || scaling_factor < 0)
+ throw clipperCairoException("cairo_to_clipper: invalid scaling factor");
+ double scaling = std::pow((double)10, scaling_factor);
+
+ pg.clear();
+ cairo_path_t *path = cairo_copy_path_flat(cr);
+
+ int poly_count = 0;
+ for (int i = 0; i < path->num_data; i += path->data[i].header.length) {
+ if( path->data[i].header.type == CAIRO_PATH_CLOSE_PATH) poly_count++;
+ }
+
+ pg.resize(poly_count);
+ int i = 0, pc = 0;
+ while (pc < poly_count)
+ {
+ int vert_count = 1;
+ int j = i;
+ while(j < path->num_data && path->data[j].header.type != CAIRO_PATH_CLOSE_PATH)
+ {
+ if (path->data[j].header.type == CAIRO_PATH_LINE_TO)
+ vert_count++;
+ j += path->data[j].header.length;
+ }
+ pg[pc].resize(vert_count);
+ if (path->data[i].header.type != CAIRO_PATH_MOVE_TO) {
+ pg.resize(pc);
+ break;
+ }
+ pg[pc][0].X = Round(path->data[i+1].point.x *scaling);
+ pg[pc][0].Y = Round(path->data[i+1].point.y *scaling);
+ if (transform != tNone)
+ transform_point(cr, transform, &pg[pc][0].X, &pg[pc][0].Y);
+
+ i += path->data[i].header.length;
+
+ j = 1;
+ while (j < vert_count && i < path->num_data && path->data[i].header.type == CAIRO_PATH_LINE_TO) {
+ pg[pc][j].X = Round(path->data[i+1].point.x *scaling);
+ pg[pc][j].Y = Round(path->data[i+1].point.y *scaling);
+ if (transform != tNone)
+ transform_point(cr, transform, &pg[pc][j].X, &pg[pc][j].Y);
+ j++;
+ i += path->data[i].header.length;
+ }
+ pc++;
+ i += path->data[i].header.length;
+ }
+ cairo_path_destroy(path);
+ }
+ //--------------------------------------------------------------------------
+
+ void clipper_to_cairo(const Paths &pg, cairo_t* cr, int scaling_factor, Transform transform)
+ {
+ if (scaling_factor > 8 || scaling_factor < 0)
+ throw clipperCairoException("clipper_to_cairo: invalid scaling factor");
+ double scaling = std::pow((double)10, scaling_factor);
+ for (size_t i = 0; i < pg.size(); ++i)
+ {
+ size_t sz = pg[i].size();
+ if (sz < 3)
+ continue;
+ cairo_new_sub_path(cr);
+ //std::cerr << "sub path";
+ for (size_t j = 0; j < sz; ++j) {
+ cInt x = pg[i][j].X, y = pg[i][j].Y;
+ if (transform != tNone)
+ transform_point(cr, transform, &x, &y);
+ //std::cerr << " (" << (double)x / scaling << "," << (double)y / scaling << ")";
+ cairo_line_to(cr, (double)x / scaling, (double)y / scaling);
+ }
+ //std::cerr << std::endl;
+ cairo_close_path(cr);
+ }
+ }
+ //--------------------------------------------------------------------------
+
+ }
+}
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