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lcd: align bmp header when uncopmressing image 

When compressed image is loaded, it must be decompressed
to an aligned address + 2 to avoid unaligned access exception
on some ARM platforms.

Signed-off-by: Piotr Wilczek <p.wilczek@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
CC: Anatolij Gustschin <agust@denx.de>
CC: Wolfgang Denk <wd@denx.de>
Signed-off-by: Anatolij Gustschin <agust@denx.de>
This commit is contained in:
Piotr Wilczek 2013-06-05 08:14:30 +02:00 committed by Anatolij Gustschin
parent 5af7d0f090
commit f7ef9d610c
2 changed files with 30 additions and 15 deletions
common
cmd_bmp.c
include
lcd.h

42
common/cmd_bmp.c
View File

@ -38,14 +38,19 @@ static int bmp_info (ulong addr);
/*
* Allocate and decompress a BMP image using gunzip().
*
* Returns a pointer to the decompressed image data. Must be freed by
* the caller after use.
* Returns a pointer to the decompressed image data. This pointer is
* aligned to 32-bit-aligned-address + 2.
* See doc/README.displaying-bmps for explanation.
*
* The allocation address is passed to 'alloc_addr' and must be freed
* by the caller after use.
*
* Returns NULL if decompression failed, or if the decompressed data
* didn't contain a valid BMP signature.
*/
#ifdef CONFIG_VIDEO_BMP_GZIP
bmp_image_t *gunzip_bmp(unsigned long addr, unsigned long *lenp)
bmp_image_t *gunzip_bmp(unsigned long addr, unsigned long *lenp,
void **alloc_addr)
{
void *dst;
unsigned long len;
@ -55,12 +60,19 @@ bmp_image_t *gunzip_bmp(unsigned long addr, unsigned long *lenp)
* Decompress bmp image
*/
len = CONFIG_SYS_VIDEO_LOGO_MAX_SIZE;
dst = malloc(CONFIG_SYS_VIDEO_LOGO_MAX_SIZE);
/* allocate extra 3 bytes for 32-bit-aligned-address + 2 alignment */
dst = malloc(CONFIG_SYS_VIDEO_LOGO_MAX_SIZE + 3);
if (dst == NULL) {
puts("Error: malloc in gunzip failed!\n");
return NULL;
}
if (gunzip(dst, CONFIG_SYS_VIDEO_LOGO_MAX_SIZE, (uchar *)addr, &len) != 0) {
bmp = dst;
/* align to 32-bit-aligned-address + 2 */
bmp = (bmp_image_t *)((((unsigned int)dst + 1) & ~3) + 2);
if (gunzip(bmp, CONFIG_SYS_VIDEO_LOGO_MAX_SIZE, (uchar *)addr, &len) != 0) {
free(dst);
return NULL;
}
@ -68,8 +80,6 @@ bmp_image_t *gunzip_bmp(unsigned long addr, unsigned long *lenp)
puts("Image could be truncated"
" (increase CONFIG_SYS_VIDEO_LOGO_MAX_SIZE)!\n");
bmp = dst;
/*
* Check for bmp mark 'BM'
*/
@ -81,10 +91,12 @@ bmp_image_t *gunzip_bmp(unsigned long addr, unsigned long *lenp)
debug("Gzipped BMP image detected!\n");
*alloc_addr = dst;
return bmp;
}
#else
bmp_image_t *gunzip_bmp(unsigned long addr, unsigned long *lenp)
bmp_image_t *gunzip_bmp(unsigned long addr, unsigned long *lenp,
void **alloc_addr)
{
return NULL;
}
@ -189,11 +201,12 @@ U_BOOT_CMD(
static int bmp_info(ulong addr)
{
bmp_image_t *bmp=(bmp_image_t *)addr;
void *bmp_alloc_addr = NULL;
unsigned long len;
if (!((bmp->header.signature[0]=='B') &&
(bmp->header.signature[1]=='M')))
bmp = gunzip_bmp(addr, &len);
bmp = gunzip_bmp(addr, &len, &bmp_alloc_addr);
if (bmp == NULL) {
printf("There is no valid bmp file at the given address\n");
@ -205,8 +218,8 @@ static int bmp_info(ulong addr)
printf("Bits per pixel: %d\n", le16_to_cpu(bmp->header.bit_count));
printf("Compression : %d\n", le32_to_cpu(bmp->header.compression));
if ((unsigned long)bmp != addr)
free(bmp);
if (bmp_alloc_addr)
free(bmp_alloc_addr);
return(0);
}
@ -225,11 +238,12 @@ int bmp_display(ulong addr, int x, int y)
{
int ret;
bmp_image_t *bmp = (bmp_image_t *)addr;
void *bmp_alloc_addr = NULL;
unsigned long len;
if (!((bmp->header.signature[0]=='B') &&
(bmp->header.signature[1]=='M')))
bmp = gunzip_bmp(addr, &len);
bmp = gunzip_bmp(addr, &len, &bmp_alloc_addr);
if (!bmp) {
printf("There is no valid bmp file at the given address\n");
@ -244,8 +258,8 @@ int bmp_display(ulong addr, int x, int y)
# error bmp_display() requires CONFIG_LCD or CONFIG_VIDEO
#endif
if ((unsigned long)bmp != addr)
free(bmp);
if (bmp_alloc_addr)
free(bmp_alloc_addr);
return ret;
}

3
include/lcd.h
View File

@ -46,7 +46,8 @@ void lcd_initcolregs(void);
int lcd_getfgcolor(void);
/* gunzip_bmp used if CONFIG_VIDEO_BMP_GZIP */
struct bmp_image *gunzip_bmp(unsigned long addr, unsigned long *lenp);
struct bmp_image *gunzip_bmp(unsigned long addr, unsigned long *lenp,
void **alloc_addr);
int bmp_display(ulong addr, int x, int y);
/**