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Unified Diff: third_party/libjpeg_turbo/jdhuff.h

Issue 7554002: Updates libjpeg-turbo to 1.1.90 (r677) (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/deps/
Patch Set: '' Created 9 years, 5 months ago
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Index: third_party/libjpeg_turbo/jdhuff.h
===================================================================
--- third_party/libjpeg_turbo/jdhuff.h (revision 95020)
+++ third_party/libjpeg_turbo/jdhuff.h (working copy)
@@ -2,7 +2,7 @@
* jdhuff.h
*
* Copyright (C) 1991-1997, Thomas G. Lane.
- * Copyright (C) 2010, D. R. Commander.
+ * Copyright (C) 2010-2011, D. R. Commander.
* This file is part of the Independent JPEG Group's software.
* For conditions of distribution and use, see the accompanying README file.
*
@@ -208,6 +208,26 @@
} \
}
+#define HUFF_DECODE_FAST(s,nb,htbl) \
+ FILL_BIT_BUFFER_FAST; \
+ s = PEEK_BITS(HUFF_LOOKAHEAD); \
+ s = htbl->lookup[s]; \
+ nb = s >> HUFF_LOOKAHEAD; \
+ /* Pre-execute the common case of nb <= HUFF_LOOKAHEAD */ \
+ DROP_BITS(nb); \
+ s = s & ((1 << HUFF_LOOKAHEAD) - 1); \
+ if (nb > HUFF_LOOKAHEAD) { \
+ /* Equivalent of jpeg_huff_decode() */ \
+ /* Don't use GET_BITS() here because we don't want to modify bits_left */ \
+ s = (get_buffer >> bits_left) & ((1 << (nb)) - 1); \
+ while (s > htbl->maxcode[nb]) { \
+ s <<= 1; \
+ s |= GET_BITS(1); \
+ nb++; \
+ } \
+ s = htbl->pub->huffval[ (int) (s + htbl->valoffset[nb]) & 0xFF ]; \
+ }
+
/* Out-of-line case for Huffman code fetching */
EXTERN(int) jpeg_huff_decode
JPP((bitread_working_state * state, register bit_buf_type get_buffer,
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