From 542f783b189fe7d2139a1e5e8c37f5b0f264805b Mon Sep 17 00:00:00 2001
From: Richard Wilson <rjw@netsurf-browser.org>
Date: Wed, 10 Nov 2004 19:51:32 +0000
Subject: [project @ 2004-11-10 19:51:31 by rjw] Further GIF optimisation to
 reduce flicker.

svn path=/import/netsurf/; revision=1356
---
 gtk/gtk_bitmap.c | 13 +++++++++++++
 image/bitmap.h   |  1 +
 image/gif.c      |  7 ++++++-
 riscos/bitmap.c  | 13 +++++++++++++
 4 files changed, 33 insertions(+), 1 deletion(-)

diff --git a/gtk/gtk_bitmap.c b/gtk/gtk_bitmap.c
index 7db84ffe2..ae9fd1695 100644
--- a/gtk/gtk_bitmap.c
+++ b/gtk/gtk_bitmap.c
@@ -70,6 +70,19 @@ bool bitmap_test_opaque(struct bitmap *bitmap)
 }
 
 
+/**
+ * Gets whether a bitmap should be plotted opaque
+ *
+ * \param  bitmap  a bitmap, as returned by bitmap_create()
+ */
+bool bitmap_get_opaque(struct bitmap *bitmap)
+{
+	assert(bitmap);
+/* todo: get whether bitmap is opaque */
+	return false;
+}
+
+
 /**
  * Return a pointer to the pixel data in a bitmap.
  *
diff --git a/image/bitmap.h b/image/bitmap.h
index 058e03a46..484e64599 100644
--- a/image/bitmap.h
+++ b/image/bitmap.h
@@ -28,6 +28,7 @@ struct bitmap;
 struct bitmap *bitmap_create(int width, int height);
 void bitmap_set_opaque(struct bitmap *bitmap, bool opaque);
 bool bitmap_test_opaque(struct bitmap *bitmap);
+bool bitmap_get_opaque(struct bitmap *bitmap);
 char *bitmap_get_buffer(struct bitmap *bitmap);
 size_t bitmap_get_rowstride(struct bitmap *bitmap);
 void bitmap_destroy(struct bitmap *bitmap);
diff --git a/image/gif.c b/image/gif.c
index 697ef408f..8fabf5033 100644
--- a/image/gif.c
+++ b/image/gif.c
@@ -220,7 +220,12 @@ void nsgif_animate(void *p)
 		data.redraw.full_redraw =
 				c->data.gif.gif->frames[c->data.gif.current_frame - 1].redraw_required;
 	} else {
-		data.redraw.full_redraw = true;
+		/* do advanced check */
+		data.redraw.full_redraw = !((c->data.gif.current_frame == 0) &&
+				(bitmap_get_opaque(c->data.gif.gif->frame_image)) &&
+				(data.redraw.x == 0) && (data.redraw.y == 0) &&
+				(data.redraw.width = c->data.gif.gif->width) &&
+				(data.redraw.height = c->data.gif.gif->height));
 	}
 
 	/* other data */
diff --git a/riscos/bitmap.c b/riscos/bitmap.c
index 1fad86ff9..397668e6d 100644
--- a/riscos/bitmap.c
+++ b/riscos/bitmap.c
@@ -108,6 +108,19 @@ bool bitmap_test_opaque(struct bitmap *bitmap)
 	return true;
 }
 
+
+/**
+ * Gets whether a bitmap should be plotted opaque
+ *
+ * \param  bitmap  a bitmap, as returned by bitmap_create()
+ */
+bool bitmap_get_opaque(struct bitmap *bitmap)
+{
+	assert(bitmap);
+	return (bitmap->opaque);
+}
+
+
 /**
  * Return a pointer to the pixel data in a bitmap.
  *
-- 
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