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Import: extract condition from loop

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do_copy is a loop invariant, but based on a variable parameter; it would
only be extracted if Import was inlined.

Change-Id: Id5b4a1a4a83a4f2083444da4934e4c994df65b44
This commit is contained in:
James Zern 2018-02-17 13:30:28 -08:00
parent 3b07d32712
commit 1e3dfc48fb
1 changed files with 9 additions and 5 deletions
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8
src/enc/picture_csp_enc.c
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@ -1110,10 +1110,14 @@ static int Import(WebPPicture* const picture,
uint32_t* dst = picture->argb; uint32_t* dst = picture->argb;
const int do_copy = (ALPHA_OFFSET == 3) && swap_rb; const int do_copy = (ALPHA_OFFSET == 3) && swap_rb;
assert(step == 4); assert(step == 4);
for (y = 0; y < height; ++y) {
if (do_copy) { if (do_copy) {
for (y = 0; y < height; ++y) {
memcpy(dst, rgb, width * 4); memcpy(dst, rgb, width * 4);
rgb += rgb_stride;
dst += picture->argb_stride;
}
} else { } else {
for (y = 0; y < height; ++y) {
#ifdef WORDS_BIGENDIAN #ifdef WORDS_BIGENDIAN
// BGRA or RGBA input order. // BGRA or RGBA input order.
const uint8_t* a_ptr = rgb + 3; const uint8_t* a_ptr = rgb + 3;
@ -1125,10 +1129,10 @@ static int Import(WebPPicture* const picture,
// RGBA input order. Need to swap R and B. // RGBA input order. Need to swap R and B.
VP8LConvertBGRAToRGBA((const uint32_t*)rgb, width, (uint8_t*)dst); VP8LConvertBGRAToRGBA((const uint32_t*)rgb, width, (uint8_t*)dst);
#endif #endif
}
rgb += rgb_stride; rgb += rgb_stride;
dst += picture->argb_stride; dst += picture->argb_stride;
} }
}
} else { } else {
uint32_t* dst = picture->argb; uint32_t* dst = picture->argb;
assert(step >= 3); assert(step >= 3);