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j*huff.c: Remove crufty ASSIGN_STATE() macro

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This macro is a relic of libjpeg's historic need to support a wide
variety of C compilers with varying degrees of compatibility.  Such was
necessary during the open systems era, because C compilers were often
supplied by the system vendor.  Prior to 1989, there was no C standard
per se, and even after ANSI C became a thing, there were still compilers
in use that didn't conform to it (libjpeg was first released in 1991.)

Realistically, only a handful of C compilers are in widespread use these
days, and all modern C compilers should support structure assignment.
This commit is contained in:
DRC
2019-10-16 20:11:59 -05:00
parent 95f4d6ef8b
commit adf9cc942f
3 changed files with 11 additions and 68 deletions
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28
jchuff.c
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@@ -78,26 +78,6 @@ typedef struct {
int last_dc_val[MAX_COMPS_IN_SCAN]; /* last DC coef for each component */
} savable_state;
/* This macro is to work around compilers with missing or broken
* structure assignment. You'll need to fix this code if you have
* such a compiler and you change MAX_COMPS_IN_SCAN.
*/
#ifndef NO_STRUCT_ASSIGN
#define ASSIGN_STATE(dest, src) ((dest) = (src))
#else
#if MAX_COMPS_IN_SCAN == 4
#define ASSIGN_STATE(dest, src) \
((dest).put_buffer = (src).put_buffer, \
(dest).put_bits = (src).put_bits, \
(dest).last_dc_val[0] = (src).last_dc_val[0], \
(dest).last_dc_val[1] = (src).last_dc_val[1], \
(dest).last_dc_val[2] = (src).last_dc_val[2], \
(dest).last_dc_val[3] = (src).last_dc_val[3])
#endif
#endif
typedef struct {
struct jpeg_entropy_encoder pub; /* public fields */
@@ -661,7 +641,7 @@ encode_mcu_huff(j_compress_ptr cinfo, JBLOCKROW *MCU_data)
/* Load up working state */
state.next_output_byte = cinfo->dest->next_output_byte;
state.free_in_buffer = cinfo->dest->free_in_buffer;
ASSIGN_STATE(state.cur, entropy->saved);
state.cur = entropy->saved;
state.cinfo = cinfo;
/* Emit restart marker if needed */
@@ -701,7 +681,7 @@ encode_mcu_huff(j_compress_ptr cinfo, JBLOCKROW *MCU_data)
/* Completed MCU, so update state */
cinfo->dest->next_output_byte = state.next_output_byte;
cinfo->dest->free_in_buffer = state.free_in_buffer;
ASSIGN_STATE(entropy->saved, state.cur);
entropy->saved = state.cur;
/* Update restart-interval state too */
if (cinfo->restart_interval) {
@@ -730,7 +710,7 @@ finish_pass_huff(j_compress_ptr cinfo)
/* Load up working state ... flush_bits needs it */
state.next_output_byte = cinfo->dest->next_output_byte;
state.free_in_buffer = cinfo->dest->free_in_buffer;
ASSIGN_STATE(state.cur, entropy->saved);
state.cur = entropy->saved;
state.cinfo = cinfo;
/* Flush out the last data */
@@ -740,7 +720,7 @@ finish_pass_huff(j_compress_ptr cinfo)
/* Update state */
cinfo->dest->next_output_byte = state.next_output_byte;
cinfo->dest->free_in_buffer = state.free_in_buffer;
ASSIGN_STATE(entropy->saved, state.cur);
entropy->saved = state.cur;
}