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authorEric Nelson <eric.nelson@boundarydevices.com>2014-03-08 07:55:52 -0700
committerTom Rini <trini@ti.com>2014-03-10 13:50:31 -0400
commit5ca05c8b0304c6e99466fd3c43398273c1e9cad9 (patch)
treeb051863dcc59e11907cf02f38ff6893573683d21 /drivers
parent73545f75b66d5bd68076742f082a5b7fdfb5b086 (diff)
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cfb_console: align fields in gzipped .bmp files
.bmp files contain 32-bit integers aligned at offsets of +2, +6, et cetera within the bmp_header structure (see include/bmp_layout.h). Support for gzip-compressed .bmp files is present in the cfb_console display subsystem by uncompressing them prior to use. This patch forces the in-memory header to be aligned properly for these compressed images by extracting them to a 2-byte offset in the memory returned by malloc. Since malloc will always return a 4-byte aligned value, this forces the .bmp header fields to be naturally aligned on 4-byte addresses. Refer to these files for more details: doc/README.displaying-bmps Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/video/cfb_console.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/video/cfb_console.c b/drivers/video/cfb_console.c
index 6db4073..b52e9ed 100644
--- a/drivers/video/cfb_console.c
+++ b/drivers/video/cfb_console.c
@@ -1473,7 +1473,11 @@ int video_display_bitmap(ulong bmp_image, int x, int y)
printf("Error: malloc in gunzip failed!\n");
return 1;
}
- if (gunzip(dst, CONFIG_SYS_VIDEO_LOGO_MAX_SIZE,
+ /*
+ * NB: we need to force offset of +2
+ * See doc/README.displaying-bmps
+ */
+ if (gunzip(dst+2, CONFIG_SYS_VIDEO_LOGO_MAX_SIZE-2,
(uchar *) bmp_image,
&len) != 0) {
printf("Error: no valid bmp or bmp.gz image at %lx\n",
@@ -1489,7 +1493,7 @@ int video_display_bitmap(ulong bmp_image, int x, int y)
/*
* Set addr to decompressed image
*/
- bmp = (bmp_image_t *) dst;
+ bmp = (bmp_image_t *)(dst+2);
if (!((bmp->header.signature[0] == 'B') &&
(bmp->header.signature[1] == 'M'))) {