From fd3c7753435658a6aeebf1b68d18178a6c7cf57d Mon Sep 17 00:00:00 2001
From: Vincent Sanders <vince@netsurf-browser.org>
Date: Wed, 6 Jan 2010 22:26:55 +0000
Subject: add bezier curve plotters

svn path=/trunk/libnsfb/; revision=9794
---
 include/libnsfb.h      | 20 ++++++++++++++++++++
 include/libnsfb_plot.h |  4 ++++
 include/nsfb_plot.h    | 10 ++++++++++
 3 files changed, 34 insertions(+)

(limited to 'include')

diff --git a/include/libnsfb.h b/include/libnsfb.h
index 5975768..41490ad 100644
--- a/include/libnsfb.h
+++ b/include/libnsfb.h
@@ -15,9 +15,29 @@
 
 typedef struct nsfb_cursor_s nsfb_cursor_t;
 typedef struct nsfb_s nsfb_t;
+
+/** representation of a colour.
+ *
+ * The colour value comprises of four components arranged in the order ABGR:
+ * bits 24-31 are the alpha value and represent the opacity. 0 is
+ *   transparent i.e. there would be no change in the target surface if
+ *   this colour were to be used and 0xFF is opaque.
+ *
+ * bits 16-23 are the Blue component of the colour.
+ *
+ * bits 8-15 are the Green component of the colour.
+ *
+ * bits 0-7 are the Red component of the colour.
+ */
 typedef uint32_t nsfb_colour_t;
 typedef struct nsfb_event_s nsfb_event_t;
 
+/** co-ordinate for plotting operations */
+typedef struct nsfb_point_s {
+    int x;
+    int y;
+} nsfb_point_t;
+
 /** bounding box for plotting operations */
 typedef struct nsfb_bbox_s {
     int x0;
diff --git a/include/libnsfb_plot.h b/include/libnsfb_plot.h
index 45aad28..1d420b0 100644
--- a/include/libnsfb_plot.h
+++ b/include/libnsfb_plot.h
@@ -78,6 +78,10 @@ bool nsfb_plot_arc(nsfb_t *nsfb, int x, int y, int radius, int angle1, int angle
  */
 bool nsfb_plot_point(nsfb_t *nsfb, int x, int y, nsfb_colour_t c);
 
+bool nsfb_plot_cubic_bezier(nsfb_t *nsfb, nsfb_bbox_t *curve, nsfb_point_t *ctrla, nsfb_point_t *ctrlb, nsfb_colour_t c);
+
+bool nsfb_plot_quadratic_bezier(nsfb_t *nsfb, nsfb_bbox_t *curve, nsfb_point_t *ctrla, nsfb_colour_t cl);
+
 /** copy an area of screen 
  *
  * Copy an area of the display.
diff --git a/include/nsfb_plot.h b/include/nsfb_plot.h
index 790a923..52af7cd 100644
--- a/include/nsfb_plot.h
+++ b/include/nsfb_plot.h
@@ -83,6 +83,14 @@ typedef bool (nsfb_plotfn_glyph1_t)(nsfb_t *nsfb, nsfb_bbox_t *loc, const uint8_
  */
 typedef	bool (nsfb_plotfn_readrect_t)(nsfb_t *nsfb, nsfb_bbox_t *rect, nsfb_colour_t *buffer);
 
+/** Plot quadratic bezier spline
+ */
+typedef bool (nsfb_plotfn_quadratic_bezier_t)(nsfb_t *nsfb, nsfb_bbox_t *curve, nsfb_point_t *ctrla, nsfb_colour_t c);
+
+/** Plot cubic bezier spline
+ */
+typedef bool (nsfb_plotfn_cubic_bezier_t)(nsfb_t *nsfb, nsfb_bbox_t *curve, nsfb_point_t *ctrla, nsfb_point_t *ctrlb, nsfb_colour_t c);
+
 /** plotter function table. */
 typedef struct nsfb_plotter_fns_s {
     nsfb_plotfn_clg_t *clg;
@@ -101,6 +109,8 @@ typedef struct nsfb_plotter_fns_s {
     nsfb_plotfn_glyph8_t *glyph8;
     nsfb_plotfn_glyph1_t *glyph1;
     nsfb_plotfn_readrect_t *readrect;
+    nsfb_plotfn_quadratic_bezier_t *quadratic;
+    nsfb_plotfn_cubic_bezier_t *cubic;
 } nsfb_plotter_fns_t;
 
 
-- 
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