* grub-core/gfxmenu/gui_canvas.c: Likewise.
        * grub-core/gfxmenu/view.c: Likewise.
        * grub-core/video/fb/video_fb.c: Introduce new functions:
        grub_video_set_area_status, grub_video_get_area_status,
        grub_video_set_region, grub_video_get_region.
        * grub-core/video/bochs.c: Likewise.
        * grub-core/video/capture.c: Likewise.
        * grub-core/video/video.c: Likewise.
        * grub-core/video/cirrus.c: Likewise.
        * grub-core/video/efi_gop.c: Likewise.
        * grub-core/video/efi_uga.c: Likewise.
        * grub-core/video/emu/sdl.c: Likewise.
        * grub-core/video/radeon_fuloong2e.c: Likewise.
        * grub-core/video/sis315pro.c: Likewise.
        * grub-core/video/sm712.c: Likewise.
        * grub-core/video/i386/pc/vbe.c: Likewise.
        * grub-core/video/i386/pc/vga.c: Likewise.
        * grub-core/video/ieee1275.c: Likewise.
        * grub-core/video/i386/coreboot/cbfb.c: Likewise.
        * include/grub/video.h: Likewise.
        * include/grub/video_fb.h: Likewise.
        * include/grub/fbfill.h: Updated render_target structure.
        grub_video_rect_t viewport, region, area
        int area_offset_x, area_offset_y, area_enabled
        * include/grub/gui.h: New helper function
        grub_video_bounds_inside_region.
        * docs/grub-dev.texi: Added information about new functions.

       into one.

	Use unsigned divisions rather than signed variants.

	Correctly will with maximum transparency when using index color.

	and relocation overhead.

	format.

	Fix order bug.
	(grub_video_fbblit_blend_RGB888_RGBA8888): Likewise.

	* grub-core/video/fb/video_fb.c (dirty): New struct.
	(framebuffer): Add members current_dirty and previous_dirty.
	(dirty): New function.
	(grub_video_fb_fill_rect): Update dirty.
	(common_blitter): Likewise.
	(grub_video_fb_scroll): Likewise.
	(doublebuf_blit_update_screen): Copy only dirty part.
	(doublebuf_pageflipping_update_screen): Likewise.
	(grub_video_fb_doublebuf_blit_init): Init dirty.
	(doublebuf_pageflipping_init): Likewise.
	(grub_video_fb_setup): Likewise.

	* include/grub/video_fb.h (grub_video_fb_doublebuf_update_screen_t):
	Move from here ...
	* grub-core/video/fb/video_fb.c
	(grub_video_fb_doublebuf_update_screen_t): ... here. Remove arguments.
	* grub-core/video/fb/video_fb.c (framebuf_t): New type.
	(front_target): Remove front_target. Add pages.
	(grub_video_fb_init): Skip setting front_pages.
	(grub_video_fb_fini): Likewise.
	(doublebuf_blit_update_screen): Use pages.
	(grub_video_fb_doublebuf_blit_init): Likewise.
	(doublebuf_pageflipping_init): Allocate offscreen buffer.
	(doublebuf_pageflipping_update_screen): Use offscreen buffer.
	(grub_video_fb_setup): Prefer doublebuffing.

	on it.

	Make several optimisations while on it.

	* grub-core/video/fb/fbblit.c (grub_video_fbblit_replace_directN):
	Optimise and use GRUB_VIDEO_FB_ADVANCE_POINTER.
	(grub_video_fbblit_replace_32bit_1bit): Likewise.
	(grub_video_fbblit_replace_24bit_1bit) [!GRUB_HAVE_UNALIGNED_ACCESS]:
	Disable.
	(grub_video_fbblit_replace_16bit_1bit):
	Optimise and use GRUB_VIDEO_FB_ADVANCE_POINTER.
	(grub_video_fbblit_replace_8bit_1bit): Likewise.
	(grub_video_fbblit_replace_BGRX8888_RGBX8888): Likewise.
	(grub_video_fbblit_replace_BGRX8888_RGB888): Likewise.
	(grub_video_fbblit_replace_BGR888_RGBX8888): Likewise.
	(grub_video_fbblit_replace_BGR888_RGBX8888): Likewise.
	(grub_video_fbblit_replace_BGR888_RGB888): Likewise.
	(grub_video_fbblit_replace_RGBX8888_RGB88): Likewise.
	(grub_video_fbblit_replace_RGB888_RGBX888): Likewise.
	(grub_video_fbblit_replace_RGB888_RGBX8888): Likewise.
	(grub_video_fbblit_replace_index_RGBX8888): Likewise.
	(grub_video_fbblit_replace_index_RGB888): Likewise.
	(grub_video_fbblit_blend_BGRA8888_RGBA8888): Likewise.
	(grub_video_fbblit_blend_BGR888_RGBA8888): Likewise.
	(grub_video_fbblit_blend_RGBA8888_RGBA8888): Likewise.
	(grub_video_fbblit_blend_RGB888_RGBA8888): Likewise.
	(grub_video_fbblit_blend_index_RGBA8888): Likewise.
	(grub_video_fbblit_blend_XXXA8888_1bit): Likewise.
	(grub_video_fbblit_blend_XXX888_1bit) [!GRUB_HAVE_UNALIGNED_ACCESS]:
	Disable.
	(grub_video_fbblit_blend_XXX565_1bit):
	Optimise and use GRUB_VIDEO_FB_ADVANCE_POINTER.
	* grub-core/video/fb/fbfill.c (grub_video_fbfill_direct32): Likewise.
	* grub-core/video/fb/fbutil.c (grub_video_fb_get_video_ptr): Return
	void *.
	* grub-core/video/fb/video_fb.c (common_blitter)
	[!GRUB_HAVE_UNALIGNED_ACCESS]: Skip disabled blitters.
	(grub_video_fb_create_render_target_from_pointer)
	[!GRUB_HAVE_UNALIGNED_ACCESS]: Check alignment.
	* include/grub/fbutil.h (grub_video_fb_get_video_ptr): Return void *.
	* include/grub/i386/types.h (GRUB_HAVE_UNALIGNED_ACCESS): New
	definition.
	* include/grub/x86_64/types.h (GRUB_HAVE_UNALIGNED_ACCESS): Likewise.

	guidelines.

	* grub-core/kern/dl.c (grub_dl_check_license): New function.
	(grub_dl_load_core): Use grub_dl_check_license.
	* include/grub/dl.h (GRUB_MOD_SECTION): New macro.
	(GRUB_MOD_LICENSE): Likewise.
	(GRUB_MOD_DUAL_LICENSE): Likewise.
	All modules updated.

gcc warning.

Switch back to page zero before loading a kernel, since some kernel
drivers expect that.
Thanks to: Felix Kuehling.