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authorJulius Werner <jwerner@chromium.org>2016-06-30 22:34:57 -0700
committerAaron Durbin <adurbin@chromium.org>2016-07-02 03:22:51 +0200
commite9808b145f592db1cf9daaaad6ac42982f13f218 (patch)
tree792e0c65536863f28548a4fe566daf0f0b745060 /payloads/libpayload
parentfadfc2e2f6abbcaea7bbc92c13716c5382443993 (diff)
downloadcoreboot-e9808b145f592db1cf9daaaad6ac42982f13f218.tar.xz
cbgfx: Use memset() for faster screen clearing if possible
cbgfx currently makes a separate function call (recomputing some values) for every single pixel it draws. While we mostly don't care that much about display speed, this can become an issue if you're trying to paint the whole screen white on a lowly-clocked Cortex-A53. As a simple solution for these extreme cases, we can build a fast path into clear_screen() that just memset()s the whole framebuffer if the color and pixel format allow it. BUG=chrome-os-partner:54416 TEST=Screen drawing speed on Kevin visibly improves (from 2.5s to 3ms). Change-Id: I22f032afbb86b96fa5a0cbbdce8526a905c67b58 Signed-off-by: Julius Werner <jwerner@chromium.org> Reviewed-on: https://review.coreboot.org/15524 Tested-by: build bot (Jenkins) Reviewed-by: Daisuke Nojiri <dnojiri@chromium.org> Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Diffstat (limited to 'payloads/libpayload')
-rw-r--r--payloads/libpayload/drivers/video/graphics.c22
1 files changed, 15 insertions, 7 deletions
diff --git a/payloads/libpayload/drivers/video/graphics.c b/payloads/libpayload/drivers/video/graphics.c
index 01e3565996..943f8edcae 100644
--- a/payloads/libpayload/drivers/video/graphics.c
+++ b/payloads/libpayload/drivers/video/graphics.c
@@ -223,16 +223,24 @@ int clear_canvas(const struct rgb_color *rgb)
int clear_screen(const struct rgb_color *rgb)
{
- uint32_t color;
- struct vector p;
-
if (cbgfx_init())
return CBGFX_ERROR_INIT;
- color = calculate_color(rgb);
- for (p.y = 0; p.y < screen.size.height; p.y++)
- for (p.x = 0; p.x < screen.size.width; p.x++)
- set_pixel(&p, color);
+ struct vector p;
+ uint32_t color = calculate_color(rgb);
+ const int bpp = fbinfo->bits_per_pixel;
+ const int bpl = fbinfo->bytes_per_line;
+
+ /* If all significant bytes in color are equal, fastpath through memset.
+ * We assume that for 32bpp the high byte gets ignored anyway. */
+ if ((((color >> 8) & 0xff) == (color & 0xff)) && (bpp == 16 ||
+ (((color >> 16) & 0xff) == (color & 0xff)))) {
+ memset(fbaddr, color & 0xff, screen.size.height * bpl);
+ } else {
+ for (p.y = 0; p.y < screen.size.height; p.y++)
+ for (p.x = 0; p.x < screen.size.width; p.x++)
+ set_pixel(&p, color);
+ }
return CBGFX_SUCCESS;
}