X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fpixelstore.cpp;fp=source%2Fpixelstore.cpp;h=011866e3e72410a44031a0b154367c621bebb44f;hb=126161d1d44ab9503bc747d24a07b7b9d15e527a;hp=c32cf60964a30b43cf7946782fa2c5943231e710;hpb=dcd8bd3a16a4af8e77aa84877b3f8a4fb03b8c7e;p=libs%2Fgl.git

diff --git a/source/pixelstore.cpp b/source/pixelstore.cpp
index c32cf609..011866e3 100644
--- a/source/pixelstore.cpp
+++ b/source/pixelstore.cpp
@@ -27,10 +27,31 @@ PixelStore PixelStore::from_image(const Graphics::Image &img)
 	return pstore;
 }
 
+void PixelStore::update_parameter(int mask) const
+{
+	if(cur_obj!=this)
+		return;
+
+	if(mask&SIZE)
+	{
+		glPixelStorei(GL_UNPACK_ROW_LENGTH, row_length);
+		glPixelStorei(GL_UNPACK_IMAGE_HEIGHT, image_height);
+	}
+	if(mask&ORIGIN)
+	{
+		glPixelStorei(GL_UNPACK_SKIP_PIXELS, skip_pixels);
+		glPixelStorei(GL_UNPACK_SKIP_ROWS, skip_rows);
+		glPixelStorei(GL_UNPACK_SKIP_IMAGES, skip_images);
+	}
+	if(mask&ALIGNMENT)
+		glPixelStorei(GL_UNPACK_ALIGNMENT, alignment);
+}
+
 void PixelStore::set_canvas_size(unsigned w, unsigned h)
 {
 	row_length = w;
 	image_height = h;
+	update_parameter(SIZE);
 }
 
 void PixelStore::set_origin(unsigned x, unsigned y, unsigned z)
@@ -38,24 +59,19 @@ void PixelStore::set_origin(unsigned x, unsigned y, unsigned z)
 	skip_pixels = x;
 	skip_rows = y;
 	skip_images = z;
+	update_parameter(ORIGIN);
 }
 
 void PixelStore::set_alignment(unsigned a)
 {
 	alignment = a;
+	update_parameter(ALIGNMENT);
 }
 
 void PixelStore::bind() const
 {
 	if(set_current(this))
-	{
-		glPixelStorei(GL_UNPACK_ROW_LENGTH, row_length);
-		glPixelStorei(GL_UNPACK_IMAGE_HEIGHT, image_height);
-		glPixelStorei(GL_UNPACK_SKIP_PIXELS, skip_pixels);
-		glPixelStorei(GL_UNPACK_SKIP_ROWS, skip_rows);
-		glPixelStorei(GL_UNPACK_SKIP_IMAGES, skip_images);
-		glPixelStorei(GL_UNPACK_ALIGNMENT, alignment);
-	}
+		update_parameter(-1);
 }
 
 } // namespace GL