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blit: fix alignment errors on ARM

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Depending on 'src_w' and 'dst_w', different lines of a block to copy may be
32-bit aligned or not, so the alignment of each line needs to get checked.

Fixes #1111.
This commit is contained in:
Christian Prochaska 2014-05-20 22:52:56 +02:00 committed by Norman Feske
parent 031cabf862
commit 9580954d81
1 changed files with 21 additions and 10 deletions
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31
repos/os/src/lib/blit/arm/blit_helper.h
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@ -37,9 +37,9 @@ static inline void copy_16bit_column(char const *src, int src_w,
* \param src_w width of source buffer in bytes
* \param dst_w width of destination buffer in bytes
*/
static void copy_block_32bit(char const *src, int src_w,
char *dst, int dst_w,
int w, int h)
static inline void copy_block_32bit(char const *src, int src_w,
char *dst, int dst_w,
int w, int h)
{
src_w -= w*4;
dst_w -= w*4;
@ -60,17 +60,28 @@ static inline void copy_block_32byte(char const *src, int src_w,
char *dst, int dst_w,
int w, int h)
{
if (((long)src & 3) || ((long)dst & 3))
copy_block_32bit(src, src_w, dst, dst_w, w*8, h);
else {
src_w -= w*32;
dst_w -= w*32;
for (; h--; src += src_w, dst += dst_w)
for (int i = w; i--;)
for (; h > 0; h--) {
/*
* Depending on 'src_w' and 'dst_w', some lines may be properly aligned,
* while others may be not, so we need to check each line.
*/
if (((long)src & 3) || ((long)dst & 3)) {
copy_block_32bit(src, src_w, dst, dst_w, w*8, 1);
src += src_w;
dst += dst_w;
} else {
for (int i = w; i > 0; i--)
asm volatile ("ldmia %0!, {r3 - r10} \n\t"
"stmia %1!, {r3 - r10} \n\t"
: "+r" (src), "+r" (dst)
:: "r3","r4","r5","r6","r7","r8","r9","r10");
/*
* 'src' and 'dst' got auto-incremented by the copy code, so only
* the remainder needs to get added
*/
src += (src_w - w*32);
dst += (dst_w - w*32);
}
}
}