From f42ed976e5e4c59b25250ad106527ac7b4447f68 Mon Sep 17 00:00:00 2001
From: John Mark Bell <jmb@netsurf-browser.org>
Date: Mon, 14 Feb 2011 19:17:08 +0000
Subject: Constify

svn path=/trunk/netsurf/; revision=11680
---
 amiga/icon.c         | 2 +-
 amiga/icon.h         | 2 +-
 content/content.c    | 8 ++++----
 content/content.h    | 4 ++--
 desktop/browser.c    | 2 +-
 desktop/browser.h    | 2 +-
 desktop/scroll.c     | 9 +++------
 desktop/scroll.h     | 4 ++--
 image/bmp.c          | 4 ++--
 image/bmp.h          | 4 ++--
 image/gif.c          | 4 ++--
 image/gif.h          | 4 ++--
 image/ico.c          | 4 ++--
 image/ico.h          | 4 ++--
 image/jpeg.c         | 4 ++--
 image/jpeg.h         | 4 ++--
 image/mng.c          | 4 ++--
 image/mng.h          | 4 ++--
 image/nssprite.c     | 2 +-
 image/nssprite.h     | 2 +-
 image/png.c          | 4 ++--
 image/png.h          | 4 ++--
 image/rsvg.c         | 2 +-
 image/rsvg.h         | 6 +-----
 image/svg.c          | 2 +-
 image/svg.h          | 2 +-
 image/webp.c         | 2 +-
 image/webp.h         | 2 +-
 render/html.h        | 4 ++--
 render/html_redraw.c | 4 ++--
 render/textplain.c   | 2 +-
 render/textplain.h   | 2 +-
 riscos/artworks.c    | 2 +-
 riscos/artworks.h    | 2 +-
 riscos/draw.c        | 2 +-
 riscos/draw.h        | 2 +-
 riscos/plugin.c      | 2 +-
 riscos/plugin.h      | 2 +-
 riscos/sprite.c      | 2 +-
 riscos/sprite.h      | 2 +-
 40 files changed, 61 insertions(+), 68 deletions(-)

diff --git a/amiga/icon.c b/amiga/icon.c
index 711144de5..d31091489 100644
--- a/amiga/icon.c
+++ b/amiga/icon.c
@@ -188,7 +188,7 @@ void amiga_icon_destroy(struct content *c)
  */
 
 bool amiga_icon_redraw(struct content *c, int x, int y,
-		int width, int height, struct rect *clip,
+		int width, int height, const struct rect *clip,
 		float scale, colour background_colour)
 {
 	return plot.bitmap(x, y, width, height,
diff --git a/amiga/icon.h b/amiga/icon.h
index f7d9e6384..bd9fb501d 100644
--- a/amiga/icon.h
+++ b/amiga/icon.h
@@ -38,7 +38,7 @@ struct content_amiga_icon_data {
 bool amiga_icon_convert(struct content *c);
 void amiga_icon_destroy(struct content *c);
 bool amiga_icon_redraw(struct content *c, int x, int y,
-		int width, int height, struct rect *clip,
+		int width, int height, const struct rect *clip,
 		float scale, colour background_colour);
 bool amiga_icon_clone(const struct content *old, struct content *new_content);
 
diff --git a/content/content.c b/content/content.c
index d3fc32388..60996f6a0 100644
--- a/content/content.c
+++ b/content/content.c
@@ -275,10 +275,10 @@ struct handler_entry {
 	void (*mouse_action)(struct content *c, struct browser_window *bw,
 			browser_mouse_state mouse, int x, int y);
 	bool (*redraw)(struct content *c, int x, int y,
-			int width, int height, struct rect *clip,
+			int width, int height, const struct rect *clip,
 			float scale, colour background_colour);
 	bool (*redraw_tiled)(struct content *c, int x, int y,
-			int width, int height, struct rect *clip,
+			int width, int height, const struct rect *clip,
 			float scale, colour background_colour,
 			bool repeat_x, bool repeat_y);
 	void (*open)(struct content *c, struct browser_window *bw,
@@ -901,7 +901,7 @@ void content_request_redraw(struct hlcache_handle *h,
  */
 
 bool content_redraw(hlcache_handle *h, int x, int y,
-		int width, int height, struct rect *clip,
+		int width, int height, const struct rect *clip,
 		float scale, colour background_colour)
 {
 	struct content *c = hlcache_handle_get_content(h);
@@ -929,7 +929,7 @@ bool content_redraw(hlcache_handle *h, int x, int y,
  */
 
 bool content_redraw_tiled(hlcache_handle *h, int x, int y,
-		int width, int height, struct rect *clip,
+		int width, int height, const struct rect *clip,
 		float scale, colour background_colour,
 		bool repeat_x, bool repeat_y)
 {
diff --git a/content/content.h b/content/content.h
index 1abb40be6..c92fdd4a2 100644
--- a/content/content.h
+++ b/content/content.h
@@ -125,10 +125,10 @@ void content_mouse_track(struct hlcache_handle *h, struct browser_window *bw,
 void content_mouse_action(struct hlcache_handle *h, struct browser_window *bw,
 		browser_mouse_state mouse, int x, int y);
 bool content_redraw(struct hlcache_handle *h, int x, int y,
-		int width, int height, struct rect *clip,
+		int width, int height, const struct rect *clip,
 		float scale, colour background_colour);
 bool content_redraw_tiled(struct hlcache_handle *h, int x, int y,
-		int width, int height, struct rect *clip,
+		int width, int height, const struct rect *clip,
 		float scale, colour background_colour,
 		bool repeat_x, bool repeat_y);
 void content_open(struct hlcache_handle *h, struct browser_window *bw,
diff --git a/desktop/browser.c b/desktop/browser.c
index b8a7818b0..36661f1de 100644
--- a/desktop/browser.c
+++ b/desktop/browser.c
@@ -90,7 +90,7 @@ static void browser_window_find_target_internal(struct browser_window *bw,
 
 /* exported interface, documented in browser.h */
 bool browser_window_redraw(struct browser_window *bw, int x, int y,
-		struct rect *clip)
+		const struct rect *clip)
 {
 	int width = 0;
 	int height = 0;
diff --git a/desktop/browser.h b/desktop/browser.h
index 59b7d7393..c12f2113c 100644
--- a/desktop/browser.h
+++ b/desktop/browser.h
@@ -273,7 +273,7 @@ bool browser_window_stop_available(struct browser_window *bw);
  * Units for x, y and clip are pixels.
  */
 bool browser_window_redraw(struct browser_window *bw, int x, int y,
-		struct rect *clip);
+		const struct rect *clip);
 
 /**
  * Check whether browser window is ready for redraw
diff --git a/desktop/scroll.c b/desktop/scroll.c
index 19efa8df5..5d7f179ba 100644
--- a/desktop/scroll.c
+++ b/desktop/scroll.c
@@ -196,15 +196,12 @@ static inline bool scroll_redraw_scrollbar_rectangle(
  * \param scroll	the scroll to be redrawn
  * \param x		the X coordinate to draw the scroll at
  * \param y		the Y coordinate to draw the scroll at
- * \param clip_x0	minimum x of the clipping rectangle
- * \param clip_y0	minimum y of the clipping rectangle
- * \param clip_x1	maximum x of the clipping rectangle
- * \param clip_y1	maximum y of the clipping rectangle
+ * \param clip		the clipping rectangle
  * \param scale		scale for the redraw
  * \return		true on succes false otherwise
  */
-bool scroll_redraw(struct scroll *scroll, int x, int y, struct rect *clip,
-		float scale)
+bool scroll_redraw(struct scroll *scroll, int x, int y, 
+		const struct rect *clip, float scale)
 {
 	int w = SCROLLBAR_WIDTH;
 	int well_length, bar_off, bar_c0, bar_c1;
diff --git a/desktop/scroll.h b/desktop/scroll.h
index ebca97463..e34ebba6b 100644
--- a/desktop/scroll.h
+++ b/desktop/scroll.h
@@ -64,8 +64,8 @@ bool scroll_create(bool horizontal, int length,
   		void *client_data, scroll_client_callback client_callback,
     		struct scroll **scroll_pt);
 void scroll_destroy(struct scroll *scroll);
-bool scroll_redraw(struct scroll *scroll, int x, int y, struct rect *clip,
-		float scale);
+bool scroll_redraw(struct scroll *scroll, int x, int y, 
+		const struct rect *clip, float scale);
 		
 void scroll_set(struct scroll *scroll, int scroll_val, bool bar);
 int scroll_get_offset(struct scroll *scroll);
diff --git a/image/bmp.c b/image/bmp.c
index b5487a3b8..f40cfb06c 100644
--- a/image/bmp.c
+++ b/image/bmp.c
@@ -117,7 +117,7 @@ bool nsbmp_convert(struct content *c)
 
 
 bool nsbmp_redraw(struct content *c, int x, int y,
-		int width, int height, struct rect *clip,
+		int width, int height, const struct rect *clip,
 		float scale, colour background_colour)
 {
 
@@ -131,7 +131,7 @@ bool nsbmp_redraw(struct content *c, int x, int y,
 
 
 bool nsbmp_redraw_tiled(struct content *c, int x, int y,
-		int width, int height, struct rect *clip,
+		int width, int height, const struct rect *clip,
 		float scale, colour background_colour,
 		bool repeat_x, bool repeat_y)
 {
diff --git a/image/bmp.h b/image/bmp.h
index b1d689d2a..cb386f6d1 100644
--- a/image/bmp.h
+++ b/image/bmp.h
@@ -46,10 +46,10 @@ bool nsbmp_create(struct content *c, const struct http_parameter *params);
 bool nsbmp_convert(struct content *c);
 void nsbmp_destroy(struct content *c);
 bool nsbmp_redraw(struct content *c, int x, int y,
-		int width, int height, struct rect *clip,
+		int width, int height, const struct rect *clip,
 		float scale, colour background_colour);
 bool nsbmp_redraw_tiled(struct content *c, int x, int y,
-		int width, int height, struct rect *clip,
+		int width, int height, const struct rect *clip,
 		float scale, colour background_colour,
 		bool repeat_x, bool repeat_y);
 bool nsbmp_clone(const struct content *old, struct content *new_content);
diff --git a/image/gif.c b/image/gif.c
index 8745942cd..94cba25f1 100644
--- a/image/gif.c
+++ b/image/gif.c
@@ -152,7 +152,7 @@ void nsgif_invalidate(void *bitmap, void *private_word)
 }
 
 bool nsgif_redraw(struct content *c, int x, int y,
-		int width, int height, struct rect *clip,
+		int width, int height, const struct rect *clip,
 		float scale, colour background_colour)
 {
 	if (c->data.gif.current_frame != c->data.gif.gif->decoded_frame)
@@ -167,7 +167,7 @@ bool nsgif_redraw(struct content *c, int x, int y,
 
 
 bool nsgif_redraw_tiled(struct content *c, int x, int y,
-		int width, int height, struct rect *clip,
+		int width, int height, const struct rect *clip,
 		float scale, colour background_colour,
 		bool repeat_x, bool repeat_y)
 {
diff --git a/image/gif.h b/image/gif.h
index 27b2385cf..a9f16d489 100644
--- a/image/gif.h
+++ b/image/gif.h
@@ -43,10 +43,10 @@ bool nsgif_create(struct content *c, const struct http_parameter *params);
 bool nsgif_convert(struct content *c);
 void nsgif_destroy(struct content *c);
 bool nsgif_redraw(struct content *c, int x, int y,
-		int width, int height, struct rect *clip,
+		int width, int height, const struct rect *clip,
 		float scale, colour background_colour);
 bool nsgif_redraw_tiled(struct content *c, int x, int y,
-		int width, int height, struct rect *clip,
+		int width, int height, const struct rect *clip,
 		float scale, colour background_colour,
 		bool repeat_x, bool repeat_y);
 bool nsgif_clone(const struct content *old, struct content *new_content);
diff --git a/image/ico.c b/image/ico.c
index e1e3d2939..f147bad08 100644
--- a/image/ico.c
+++ b/image/ico.c
@@ -105,7 +105,7 @@ bool nsico_convert(struct content *c)
 }
 
 bool nsico_redraw(struct content *c, int x, int y,
-		int width, int height, struct rect *clip,
+		int width, int height, const struct rect *clip,
 		float scale, colour background_colour)
 {
 	struct bmp_image *bmp = ico_find(c->data.ico.ico, width, height);
@@ -139,7 +139,7 @@ bool nsico_set_bitmap_from_size(hlcache_handle *h, int width, int height)
 }
 
 bool nsico_redraw_tiled(struct content *c, int x, int y,
-		int width, int height, struct rect *clip,
+		int width, int height, const struct rect *clip,
 		float scale, colour background_colour,
 		bool repeat_x, bool repeat_y)
 {
diff --git a/image/ico.h b/image/ico.h
index 16db54e94..666c22371 100644
--- a/image/ico.h
+++ b/image/ico.h
@@ -42,10 +42,10 @@ bool nsico_create(struct content *c, const struct http_parameter *params);
 bool nsico_convert(struct content *c);
 void nsico_destroy(struct content *c);
 bool nsico_redraw(struct content *c, int x, int y,
-		int width, int height, struct rect *clip,
+		int width, int height, const struct rect *clip,
 		float scale, colour background_colour);
 bool nsico_redraw_tiled(struct content *c, int x, int y,
-		int width, int height, struct rect *clip,
+		int width, int height, const struct rect *clip,
 		float scale, colour background_colour,
 		bool repeat_x, bool repeat_y);
 bool nsico_clone(const struct content *old, struct content *new_content);
diff --git a/image/jpeg.c b/image/jpeg.c
index f247243ea..4d7aa32f7 100644
--- a/image/jpeg.c
+++ b/image/jpeg.c
@@ -244,7 +244,7 @@ void nsjpeg_term_source(j_decompress_ptr cinfo)
  */
 
 bool nsjpeg_redraw(struct content *c, int x, int y,
-		int width, int height, struct rect *clip,
+		int width, int height, const struct rect *clip,
 		float scale, colour background_colour)
 {
 	return plot.bitmap(x, y, width, height,
@@ -257,7 +257,7 @@ bool nsjpeg_redraw(struct content *c, int x, int y,
  */
 
 bool nsjpeg_redraw_tiled(struct content *c, int x, int y,
-		int width, int height, struct rect *clip,
+		int width, int height, const struct rect *clip,
 		float scale, colour background_colour,
 		bool repeat_x, bool repeat_y)
 {
diff --git a/image/jpeg.h b/image/jpeg.h
index c484ec890..70bae4a6b 100644
--- a/image/jpeg.h
+++ b/image/jpeg.h
@@ -39,10 +39,10 @@ struct content_jpeg_data {
 bool nsjpeg_convert(struct content *c);
 void nsjpeg_destroy(struct content *c);
 bool nsjpeg_redraw(struct content *c, int x, int y,
-		int width, int height, struct rect *clip,
+		int width, int height, const struct rect *clip,
 		float scale, colour background_colour);
 bool nsjpeg_redraw_tiled(struct content *c, int x, int y,
-		int width, int height, struct rect *clip,
+		int width, int height, const struct rect *clip,
 		float scale, colour background_colour,
 		bool repeat_x, bool repeat_y);
 bool nsjpeg_clone(const struct content *old, struct content *new_content);
diff --git a/image/mng.c b/image/mng.c
index d360b4c1a..4ebba304d 100644
--- a/image/mng.c
+++ b/image/mng.c
@@ -524,7 +524,7 @@ void nsmng_destroy(struct content *c)
 
 
 bool nsmng_redraw(struct content *c, int x, int y,
-		int width, int height, struct rect *clip,
+		int width, int height, const struct rect *clip,
 		float scale, colour background_colour)
 {
 	bool ret;
@@ -550,7 +550,7 @@ bool nsmng_redraw(struct content *c, int x, int y,
 
 
 bool nsmng_redraw_tiled(struct content *c, int x, int y,
-		int width, int height, struct rect *clip,
+		int width, int height, const struct rect *clip,
 		float scale, colour background_colour,
 		bool repeat_x, bool repeat_y)
 {
diff --git a/image/mng.h b/image/mng.h
index eaf92968d..5835fef96 100644
--- a/image/mng.h
+++ b/image/mng.h
@@ -47,10 +47,10 @@ bool nsmng_process_data(struct content *c, const char *data, unsigned int size);
 bool nsmng_convert(struct content *c);
 void nsmng_destroy(struct content *c);
 bool nsmng_redraw(struct content *c, int x, int y,
-		int width, int height, struct rect *clip,
+		int width, int height, const struct rect *clip,
 		float scale, colour background_colour);
 bool nsmng_redraw_tiled(struct content *c, int x, int y,
-		int width, int height, struct rect *clip,
+		int width, int height, const struct rect *clip,
 		float scale, colour background_colour,
 		bool repeat_x, bool repeat_y);
 bool nsmng_clone(const struct content *old, struct content *new_content);
diff --git a/image/nssprite.c b/image/nssprite.c
index df1cdbe36..7bff6e0f7 100644
--- a/image/nssprite.c
+++ b/image/nssprite.c
@@ -136,7 +136,7 @@ void nssprite_destroy(struct content *c)
  */
 
 bool nssprite_redraw(struct content *c, int x, int y,
-		int width, int height, struct rect *clip,
+		int width, int height, const struct rect *clip,
 		float scale, colour background_colour)
 {
 	return plot.bitmap(x, y, width, height,
diff --git a/image/nssprite.h b/image/nssprite.h
index 800defd42..3b69108cd 100644
--- a/image/nssprite.h
+++ b/image/nssprite.h
@@ -38,7 +38,7 @@ struct content_nssprite_data {
 bool nssprite_convert(struct content *c);
 void nssprite_destroy(struct content *c);
 bool nssprite_redraw(struct content *c, int x, int y,
-		int width, int height, struct rect *clip,
+		int width, int height, const struct rect *clip,
 		float scale, colour background_colour);
 bool nssprite_clone(const struct content *old, struct content *new_content);
 
diff --git a/image/png.c b/image/png.c
index 246b6d4ff..cbad15029 100644
--- a/image/png.c
+++ b/image/png.c
@@ -305,7 +305,7 @@ void nspng_destroy(struct content *c)
 
 
 bool nspng_redraw(struct content *c, int x, int y,
-		int width, int height, struct rect *clip,
+		int width, int height, const struct rect *clip,
 		float scale, colour background_colour)
 {
 	assert(c->bitmap != NULL);
@@ -315,7 +315,7 @@ bool nspng_redraw(struct content *c, int x, int y,
 }
 
 bool nspng_redraw_tiled(struct content *c, int x, int y,
-		int width, int height, struct rect *clip,
+		int width, int height, const struct rect *clip,
 		float scale, colour background_colour,
 		bool repeat_x, bool repeat_y)
 {
diff --git a/image/png.h b/image/png.h
index 3e6e157be..fb9efcfd4 100644
--- a/image/png.h
+++ b/image/png.h
@@ -48,10 +48,10 @@ bool nspng_process_data(struct content *c, const char *data, unsigned int size);
 bool nspng_convert(struct content *c);
 void nspng_destroy(struct content *c);
 bool nspng_redraw(struct content *c, int x, int y,
-		int width, int height, struct rect *clip,
+		int width, int height, const struct rect *clip,
 		float scale, colour background_colour);
 bool nspng_redraw_tiled(struct content *c, int x, int y,
-		int width, int height, struct rect *clip,
+		int width, int height, const struct rect *clip,
 		float scale, colour background_colour,
 		bool repeat_x, bool repeat_y);
 bool nspng_clone(const struct content *old, struct content *new_content);
diff --git a/image/rsvg.c b/image/rsvg.c
index 31feb498f..7f88d82ad 100644
--- a/image/rsvg.c
+++ b/image/rsvg.c
@@ -181,7 +181,7 @@ bool rsvg_convert(struct content *c)
 }
 
 bool rsvg_redraw(struct content *c, int x, int y,
-		int width, int height, struct rect *clip,
+		int width, int height, const struct rect *clip,
 		float scale, colour background_colour)
 {
 	plot.bitmap(x, y, width, height, c->bitmap, background_colour, BITMAPF_NONE);
diff --git a/image/rsvg.h b/image/rsvg.h
index 78a853c89..90b4ba8f3 100644
--- a/image/rsvg.h
+++ b/image/rsvg.h
@@ -48,12 +48,8 @@ bool rsvg_process_data(struct content *c, const char *data, unsigned int size);
 bool rsvg_convert(struct content *c);
 void rsvg_destroy(struct content *c);
 bool rsvg_redraw(struct content *c, int x, int y,
-                int width, int height, struct rect *clip,
+                int width, int height, const struct rect *clip,
                 float scale, colour background_colour);
-bool rsvg_redraw_tiled(struct content *c, int x, int y,
-                int width, int height, struct rect *clip,
-                float scale, colour background_colour,
-                bool repeat_x, bool repeat_y);
 bool rsvg_clone(const struct content *old, struct content *new_content);
 
 #endif /* WITH_RSVG */
diff --git a/image/svg.c b/image/svg.c
index 26112b13c..43675faae 100644
--- a/image/svg.c
+++ b/image/svg.c
@@ -107,7 +107,7 @@ void svg_reformat(struct content *c, int width, int height)
  */
 
 bool svg_redraw(struct content *c, int x, int y,
-		int width, int height, struct rect *clip,
+		int width, int height, const struct rect *clip,
 		float scale, colour background_colour)
 {
 	float transform[6];
diff --git a/image/svg.h b/image/svg.h
index 9ce8093e6..d836cb310 100644
--- a/image/svg.h
+++ b/image/svg.h
@@ -40,7 +40,7 @@ bool svg_convert(struct content *c);
 void svg_destroy(struct content *c);
 void svg_reformat(struct content *c, int width, int height);
 bool svg_redraw(struct content *c, int x, int y,
-		int width, int height, struct rect *clip,
+		int width, int height, const struct rect *clip,
 		float scale, colour background_colour);
 bool svg_clone(const struct content *old, struct content *new_content);
 
diff --git a/image/webp.c b/image/webp.c
index 671ea5195..e4375637f 100644
--- a/image/webp.c
+++ b/image/webp.c
@@ -130,7 +130,7 @@ void webp_destroy(struct content *c)
  */
 
 bool webp_redraw(struct content *c, int x, int y,
-		int width, int height, struct rect *clip,
+		int width, int height, const struct rect *clip,
 		float scale, colour background_colour)
 {
 	return plot.bitmap(x, y, width, height,
diff --git a/image/webp.h b/image/webp.h
index acd449cbf..a89713ac3 100644
--- a/image/webp.h
+++ b/image/webp.h
@@ -38,7 +38,7 @@ struct content_webp_data {
 bool webp_convert(struct content *c);
 void webp_destroy(struct content *c);
 bool webp_redraw(struct content *c, int x, int y,
-		int width, int height, struct rect *clip,
+		int width, int height, const struct rect *clip,
 		float scale, colour background_colour);
 bool webp_clone(const struct content *old, struct content *new_content);
 
diff --git a/render/html.h b/render/html.h
index 324e795f0..ee2f041bf 100644
--- a/render/html.h
+++ b/render/html.h
@@ -209,7 +209,7 @@ void html_redraw_a_box(struct hlcache_handle *h, struct box *box);
 
 /* in render/html_redraw.c */
 bool html_redraw(struct content *c, int x, int y,
-		int width, int height, struct rect *clip,
+		int width, int height, const struct rect *clip,
 		float scale, colour background_colour);
 
 /* in render/html_interaction.c */
@@ -228,7 +228,7 @@ bool text_redraw(const char *utf8_text, size_t utf8_len,
 		size_t offset, bool space,
 		const plot_font_style_t *fstyle,
 		int x, int y,
-		struct rect *clip,
+		const struct rect *clip,
 		int height,
 		float scale,
 		bool excluded);
diff --git a/render/html_redraw.c b/render/html_redraw.c
index 019b99ed7..8468d3007 100644
--- a/render/html_redraw.c
+++ b/render/html_redraw.c
@@ -110,7 +110,7 @@ bool html_redraw_debug = false;
  */
 
 bool html_redraw(struct content *c, int x, int y,
-		int width, int height, struct rect *clip,
+		int width, int height, const struct rect *clip,
 		float scale, colour background_colour)
 {
 	struct box *box;
@@ -841,7 +841,7 @@ bool html_redraw_text_box(struct box *box, int x, int y,
 
 bool text_redraw(const char *utf8_text, size_t utf8_len,
 		size_t offset, bool space, const plot_font_style_t *fstyle,
-		int x, int y, struct rect *clip,
+		int x, int y, const struct rect *clip,
 		int height,
 		float scale,
 		bool excluded)
diff --git a/render/textplain.c b/render/textplain.c
index ada008f35..2a31c6272 100644
--- a/render/textplain.c
+++ b/render/textplain.c
@@ -546,7 +546,7 @@ void textplain_mouse_action(struct content *c, struct browser_window *bw,
  */
 
 bool textplain_redraw(struct content *c, int x, int y,
-		int width, int height, struct rect *clip,
+		int width, int height, const struct rect *clip,
 		float scale, colour background_colour)
 {
 	struct browser_window *bw = current_redraw_browser;
diff --git a/render/textplain.h b/render/textplain.h
index 284585e35..c338220d1 100644
--- a/render/textplain.h
+++ b/render/textplain.h
@@ -59,7 +59,7 @@ void textplain_mouse_action(struct content *c, struct browser_window *bw,
 void textplain_reformat(struct content *c, int width, int height);
 void textplain_destroy(struct content *c);
 bool textplain_redraw(struct content *c, int x, int y,
-		int width, int height, struct rect *clip,
+		int width, int height, const struct rect *clip,
 		float scale, colour background_colour);
 bool textplain_clone(const struct content *old, struct content *new_content);
 
diff --git a/riscos/artworks.c b/riscos/artworks.c
index ecd3c3db2..318666bea 100644
--- a/riscos/artworks.c
+++ b/riscos/artworks.c
@@ -224,7 +224,7 @@ void artworks_destroy(struct content *c)
  */
 
 bool artworks_redraw(struct content *c, int x, int y,
-		int width, int height, struct rect *clip,
+		int width, int height, const struct rect *clip,
 		float scale, colour background_colour)
 {
 	static const ns_os_vdu_var_list vars = {
diff --git a/riscos/artworks.h b/riscos/artworks.h
index 8642f76a9..5acd463ee 100644
--- a/riscos/artworks.h
+++ b/riscos/artworks.h
@@ -42,7 +42,7 @@ struct content_artworks_data {
 bool artworks_convert(struct content *c);
 void artworks_destroy(struct content *c);
 bool artworks_redraw(struct content *c, int x, int y,
-		int width, int height, struct rect *clip,
+		int width, int height, const struct rect *clip,
 		float scale, colour background_colour);
 bool artworks_clone(const struct content *old, struct content *new_content);
 
diff --git a/riscos/draw.c b/riscos/draw.c
index 4c2cfd409..b5c13d621 100644
--- a/riscos/draw.c
+++ b/riscos/draw.c
@@ -105,7 +105,7 @@ void draw_destroy(struct content *c)
  */
 
 bool draw_redraw(struct content *c, int x, int y,
-		int width, int height, struct rect *clip,
+		int width, int height, const struct rect *clip,
 		float scale, colour background_colour)
 {
 	os_trfm matrix;
diff --git a/riscos/draw.h b/riscos/draw.h
index 26c9ee08b..f7a014844 100644
--- a/riscos/draw.h
+++ b/riscos/draw.h
@@ -38,7 +38,7 @@ struct content_draw_data {
 bool draw_convert(struct content *c);
 void draw_destroy(struct content *c);
 bool draw_redraw(struct content *c, int x, int y,
-		int width, int height, struct rect *clip,
+		int width, int height, const struct rect *clip,
 		float scale, colour background_colour);
 bool draw_clone(const struct content *old, struct content *new_content);
 
diff --git a/riscos/plugin.c b/riscos/plugin.c
index 71a0167a9..340eaaf3e 100644
--- a/riscos/plugin.c
+++ b/riscos/plugin.c
@@ -249,7 +249,7 @@ void plugin_destroy(struct content *c)
  * \param scale        Scale of page (1.0 = 100%)
  */
 bool plugin_redraw(struct content *c, int x, int y,
-		int width, int height, struct rect *clip,
+		int width, int height, const struct rect *clip,
 		float scale, colour background_colour)
 {
 	/* do nothing */
diff --git a/riscos/plugin.h b/riscos/plugin.h
index 290a00da3..d23e6539e 100644
--- a/riscos/plugin.h
+++ b/riscos/plugin.h
@@ -59,7 +59,7 @@ bool plugin_convert(struct content *c, int width, int height);
 void plugin_reformat(struct content *c, int width, int height);
 void plugin_destroy(struct content *c);
 bool plugin_redraw(struct content *c, int x, int y,
-		int width, int height, struct rect *clip,
+		int width, int height, const struct rect *clip,
 		float scale, colour background_colour);
 void plugin_open(struct content *c, struct browser_window *bw,
 		struct content *page, unsigned int index, struct box *box,
diff --git a/riscos/sprite.c b/riscos/sprite.c
index cc75b54cd..fbff2f885 100644
--- a/riscos/sprite.c
+++ b/riscos/sprite.c
@@ -112,7 +112,7 @@ void sprite_destroy(struct content *c)
  */
 
 bool sprite_redraw(struct content *c, int x, int y,
-		int width, int height, struct rect *clip,
+		int width, int height, const struct rect *clip,
 		float scale, colour background_colour)
 {
 	if (plot.flush && !plot.flush())
diff --git a/riscos/sprite.h b/riscos/sprite.h
index 44cc029d8..a0b071425 100644
--- a/riscos/sprite.h
+++ b/riscos/sprite.h
@@ -38,7 +38,7 @@ struct content_sprite_data {
 bool sprite_convert(struct content *c);
 void sprite_destroy(struct content *c);
 bool sprite_redraw(struct content *c, int x, int y,
-		int width, int height, struct rect *clip,
+		int width, int height, const struct rect *clip,
 		float scale, colour background_colour);
 bool sprite_clone(const struct content *old, struct content *new_content);
 #endif
-- 
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