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19c791cdac6df84418c66eb9d67cfa9703bc2461
mozjpeg/jdmerge.c
DRC 19c791cdac Improve code formatting consistency 
With rare exceptions ...
- Always separate line continuation characters by one space from
  preceding code.
- Always use two-space indentation.  Never use tabs.
- Always use K&R-style conditional blocks.
- Always surround operators with spaces, except in raw assembly code.
- Always put a space after, but not before, a comma.
- Never put a space between type casts and variables/function calls.
- Never put a space between the function name and the argument list in
  function declarations and prototypes.
- Always surround braces ('{' and '}') with spaces.
- Always surround statements (if, for, else, catch, while, do, switch)
  with spaces.
- Always attach pointer symbols ('*' and '**') to the variable or
  function name.
- Always precede pointer symbols ('*' and '**') by a space in type
  casts.
- Use the MIN() macro from jpegint.h within the libjpeg and TurboJPEG
  API libraries (using min() from tjutil.h is still necessary for
  TJBench.)
- Where it makes sense (particularly in the TurboJPEG code), put a blank
  line after variable declaration blocks.
- Always separate statements in one-liners by two spaces.

The purpose of this was to ease maintenance on my part and also to make
it easier for contributors to figure out how to format patch
submissions.  This was admittedly confusing (even to me sometimes) when
we had 3 or 4 different style conventions in the same source tree.  The
new convention is more consistent with the formatting of other OSS code
bases.

This commit corrects deviations from the chosen formatting style in the
libjpeg API code and reformats the TurboJPEG API code such that it
conforms to the same standard.

NOTES:
- Although it is no longer necessary for the function name in function
  declarations to begin in Column 1 (this was historically necessary
  because of the ansi2knr utility, which allowed libjpeg to be built
  with non-ANSI compilers), we retain that formatting for the libjpeg
  code because it improves readability when using libjpeg's function
  attribute macros (GLOBAL(), etc.)
- This reformatting project was accomplished with the help of AStyle and
  Uncrustify, although neither was completely up to the task, and thus
  a great deal of manual tweaking was required.  Note to developers of
  code formatting utilities:  the libjpeg-turbo code base is an
  excellent test bed, because AFAICT, it breaks every single one of the
  utilities that are currently available.
- The legacy (MMX, SSE, 3DNow!) assembly code for i386 has been
  formatted to match the SSE2 code (refer to
  ff5685d5344273df321eb63a005eaae19d2496e3.)  I hadn't intended to
  bother with this, but the Loongson MMI implementation demonstrated
  that there is still academic value to the MMX implementation, as an
  algorithmic model for other 64-bit vector implementations.  Thus, it
  is desirable to improve its readability in the same manner as that of
  the SSE2 implementation.
2018-03-16 02:14:34 -05:00

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/*
* jdmerge.c
*
* This file was part of the Independent JPEG Group's software:
* Copyright (C) 1994-1996, Thomas G. Lane.
* libjpeg-turbo Modifications:
* Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
* Copyright (C) 2009, 2011, 2014-2015, D. R. Commander.
* Copyright (C) 2013, Linaro Limited.
* For conditions of distribution and use, see the accompanying README.ijg
* file.
*
* This file contains code for merged upsampling/color conversion.
*
* This file combines functions from jdsample.c and jdcolor.c;
* read those files first to understand what's going on.
*
* When the chroma components are to be upsampled by simple replication
* (ie, box filtering), we can save some work in color conversion by
* calculating all the output pixels corresponding to a pair of chroma
* samples at one time. In the conversion equations
* R = Y + K1 * Cr
* G = Y + K2 * Cb + K3 * Cr
* B = Y + K4 * Cb
* only the Y term varies among the group of pixels corresponding to a pair
* of chroma samples, so the rest of the terms can be calculated just once.
* At typical sampling ratios, this eliminates half or three-quarters of the
* multiplications needed for color conversion.
*
* This file currently provides implementations for the following cases:
* YCbCr => RGB color conversion only.
* Sampling ratios of 2h1v or 2h2v.
* No scaling needed at upsample time.
* Corner-aligned (non-CCIR601) sampling alignment.
* Other special cases could be added, but in most applications these are
* the only common cases. (For uncommon cases we fall back on the more
* general code in jdsample.c and jdcolor.c.)
*/
#define JPEG_INTERNALS
#include "jinclude.h"
#include "jpeglib.h"
#include "jsimd.h"
#include "jconfigint.h"
#ifdef UPSAMPLE_MERGING_SUPPORTED
/* Private subobject */
typedef struct {
struct jpeg_upsampler pub; /* public fields */
/* Pointer to routine to do actual upsampling/conversion of one row group */
void (*upmethod) (j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
JDIMENSION in_row_group_ctr, JSAMPARRAY output_buf);
/* Private state for YCC->RGB conversion */
int *Cr_r_tab; /* => table for Cr to R conversion */
int *Cb_b_tab; /* => table for Cb to B conversion */
JLONG *Cr_g_tab; /* => table for Cr to G conversion */
JLONG *Cb_g_tab; /* => table for Cb to G conversion */
/* For 2:1 vertical sampling, we produce two output rows at a time.
* We need a "spare" row buffer to hold the second output row if the
* application provides just a one-row buffer; we also use the spare
* to discard the dummy last row if the image height is odd.
*/
JSAMPROW spare_row;
boolean spare_full; /* T if spare buffer is occupied */
JDIMENSION out_row_width; /* samples per output row */
JDIMENSION rows_to_go; /* counts rows remaining in image */
} my_upsampler;
typedef my_upsampler *my_upsample_ptr;
#define SCALEBITS 16 /* speediest right-shift on some machines */
#define ONE_HALF ((JLONG)1 << (SCALEBITS - 1))
#define FIX(x) ((JLONG)((x) * (1L << SCALEBITS) + 0.5))
/* Include inline routines for colorspace extensions */
#include "jdmrgext.c"
#undef RGB_RED
#undef RGB_GREEN
#undef RGB_BLUE
#undef RGB_PIXELSIZE
#define RGB_RED EXT_RGB_RED
#define RGB_GREEN EXT_RGB_GREEN
#define RGB_BLUE EXT_RGB_BLUE
#define RGB_PIXELSIZE EXT_RGB_PIXELSIZE
#define h2v1_merged_upsample_internal extrgb_h2v1_merged_upsample_internal
#define h2v2_merged_upsample_internal extrgb_h2v2_merged_upsample_internal
#include "jdmrgext.c"
#undef RGB_RED
#undef RGB_GREEN
#undef RGB_BLUE
#undef RGB_PIXELSIZE
#undef h2v1_merged_upsample_internal
#undef h2v2_merged_upsample_internal
#define RGB_RED EXT_RGBX_RED
#define RGB_GREEN EXT_RGBX_GREEN
#define RGB_BLUE EXT_RGBX_BLUE
#define RGB_ALPHA 3
#define RGB_PIXELSIZE EXT_RGBX_PIXELSIZE
#define h2v1_merged_upsample_internal extrgbx_h2v1_merged_upsample_internal
#define h2v2_merged_upsample_internal extrgbx_h2v2_merged_upsample_internal
#include "jdmrgext.c"
#undef RGB_RED
#undef RGB_GREEN
#undef RGB_BLUE
#undef RGB_ALPHA
#undef RGB_PIXELSIZE
#undef h2v1_merged_upsample_internal
#undef h2v2_merged_upsample_internal
#define RGB_RED EXT_BGR_RED
#define RGB_GREEN EXT_BGR_GREEN
#define RGB_BLUE EXT_BGR_BLUE
#define RGB_PIXELSIZE EXT_BGR_PIXELSIZE
#define h2v1_merged_upsample_internal extbgr_h2v1_merged_upsample_internal
#define h2v2_merged_upsample_internal extbgr_h2v2_merged_upsample_internal
#include "jdmrgext.c"
#undef RGB_RED
#undef RGB_GREEN
#undef RGB_BLUE
#undef RGB_PIXELSIZE
#undef h2v1_merged_upsample_internal
#undef h2v2_merged_upsample_internal
#define RGB_RED EXT_BGRX_RED
#define RGB_GREEN EXT_BGRX_GREEN
#define RGB_BLUE EXT_BGRX_BLUE
#define RGB_ALPHA 3
#define RGB_PIXELSIZE EXT_BGRX_PIXELSIZE
#define h2v1_merged_upsample_internal extbgrx_h2v1_merged_upsample_internal
#define h2v2_merged_upsample_internal extbgrx_h2v2_merged_upsample_internal
#include "jdmrgext.c"
#undef RGB_RED
#undef RGB_GREEN
#undef RGB_BLUE
#undef RGB_ALPHA
#undef RGB_PIXELSIZE
#undef h2v1_merged_upsample_internal
#undef h2v2_merged_upsample_internal
#define RGB_RED EXT_XBGR_RED
#define RGB_GREEN EXT_XBGR_GREEN
#define RGB_BLUE EXT_XBGR_BLUE
#define RGB_ALPHA 0
#define RGB_PIXELSIZE EXT_XBGR_PIXELSIZE
#define h2v1_merged_upsample_internal extxbgr_h2v1_merged_upsample_internal
#define h2v2_merged_upsample_internal extxbgr_h2v2_merged_upsample_internal
#include "jdmrgext.c"
#undef RGB_RED
#undef RGB_GREEN
#undef RGB_BLUE
#undef RGB_ALPHA
#undef RGB_PIXELSIZE
#undef h2v1_merged_upsample_internal
#undef h2v2_merged_upsample_internal
#define RGB_RED EXT_XRGB_RED
#define RGB_GREEN EXT_XRGB_GREEN
#define RGB_BLUE EXT_XRGB_BLUE
#define RGB_ALPHA 0
#define RGB_PIXELSIZE EXT_XRGB_PIXELSIZE
#define h2v1_merged_upsample_internal extxrgb_h2v1_merged_upsample_internal
#define h2v2_merged_upsample_internal extxrgb_h2v2_merged_upsample_internal
#include "jdmrgext.c"
#undef RGB_RED
#undef RGB_GREEN
#undef RGB_BLUE
#undef RGB_ALPHA
#undef RGB_PIXELSIZE
#undef h2v1_merged_upsample_internal
#undef h2v2_merged_upsample_internal
/*
* Initialize tables for YCC->RGB colorspace conversion.
* This is taken directly from jdcolor.c; see that file for more info.
*/
LOCAL(void)
build_ycc_rgb_table(j_decompress_ptr cinfo)
{
my_upsample_ptr upsample = (my_upsample_ptr)cinfo->upsample;
int i;
JLONG x;
SHIFT_TEMPS
upsample->Cr_r_tab = (int *)
(*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_IMAGE,
(MAXJSAMPLE + 1) * sizeof(int));
upsample->Cb_b_tab = (int *)
(*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_IMAGE,
(MAXJSAMPLE + 1) * sizeof(int));
upsample->Cr_g_tab = (JLONG *)
(*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_IMAGE,
(MAXJSAMPLE + 1) * sizeof(JLONG));
upsample->Cb_g_tab = (JLONG *)
(*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_IMAGE,
(MAXJSAMPLE + 1) * sizeof(JLONG));
for (i = 0, x = -CENTERJSAMPLE; i <= MAXJSAMPLE; i++, x++) {
/* i is the actual input pixel value, in the range 0..MAXJSAMPLE */
/* The Cb or Cr value we are thinking of is x = i - CENTERJSAMPLE */
/* Cr=>R value is nearest int to 1.40200 * x */
upsample->Cr_r_tab[i] = (int)
RIGHT_SHIFT(FIX(1.40200) * x + ONE_HALF, SCALEBITS);
/* Cb=>B value is nearest int to 1.77200 * x */
upsample->Cb_b_tab[i] = (int)
RIGHT_SHIFT(FIX(1.77200) * x + ONE_HALF, SCALEBITS);
/* Cr=>G value is scaled-up -0.71414 * x */
upsample->Cr_g_tab[i] = (-FIX(0.71414)) * x;
/* Cb=>G value is scaled-up -0.34414 * x */
/* We also add in ONE_HALF so that need not do it in inner loop */
upsample->Cb_g_tab[i] = (-FIX(0.34414)) * x + ONE_HALF;
}
}
/*
* Initialize for an upsampling pass.
*/
METHODDEF(void)
start_pass_merged_upsample(j_decompress_ptr cinfo)
{
my_upsample_ptr upsample = (my_upsample_ptr)cinfo->upsample;
/* Mark the spare buffer empty */
upsample->spare_full = FALSE;
/* Initialize total-height counter for detecting bottom of image */
upsample->rows_to_go = cinfo->output_height;
}
/*
* Control routine to do upsampling (and color conversion).
*
* The control routine just handles the row buffering considerations.
*/
METHODDEF(void)
merged_2v_upsample(j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
JDIMENSION *in_row_group_ctr,
JDIMENSION in_row_groups_avail, JSAMPARRAY output_buf,
JDIMENSION *out_row_ctr, JDIMENSION out_rows_avail)
/* 2:1 vertical sampling case: may need a spare row. */
{
my_upsample_ptr upsample = (my_upsample_ptr)cinfo->upsample;
JSAMPROW work_ptrs[2];
JDIMENSION num_rows; /* number of rows returned to caller */
if (upsample->spare_full) {
/* If we have a spare row saved from a previous cycle, just return it. */
JDIMENSION size = upsample->out_row_width;
if (cinfo->out_color_space == JCS_RGB565)
size = cinfo->output_width * 2;
jcopy_sample_rows(&upsample->spare_row, 0, output_buf + *out_row_ctr, 0, 1,
size);
num_rows = 1;
upsample->spare_full = FALSE;
} else {
/* Figure number of rows to return to caller. */
num_rows = 2;
/* Not more than the distance to the end of the image. */
if (num_rows > upsample->rows_to_go)
num_rows = upsample->rows_to_go;
/* And not more than what the client can accept: */
out_rows_avail -= *out_row_ctr;
if (num_rows > out_rows_avail)
num_rows = out_rows_avail;
/* Create output pointer array for upsampler. */
work_ptrs[0] = output_buf[*out_row_ctr];
if (num_rows > 1) {
work_ptrs[1] = output_buf[*out_row_ctr + 1];
} else {
work_ptrs[1] = upsample->spare_row;
upsample->spare_full = TRUE;
}
/* Now do the upsampling. */
(*upsample->upmethod) (cinfo, input_buf, *in_row_group_ctr, work_ptrs);
}
/* Adjust counts */
*out_row_ctr += num_rows;
upsample->rows_to_go -= num_rows;
/* When the buffer is emptied, declare this input row group consumed */
if (!upsample->spare_full)
(*in_row_group_ctr)++;
}
METHODDEF(void)
merged_1v_upsample(j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
JDIMENSION *in_row_group_ctr,
JDIMENSION in_row_groups_avail, JSAMPARRAY output_buf,
JDIMENSION *out_row_ctr, JDIMENSION out_rows_avail)
/* 1:1 vertical sampling case: much easier, never need a spare row. */
{
my_upsample_ptr upsample = (my_upsample_ptr)cinfo->upsample;
/* Just do the upsampling. */
(*upsample->upmethod) (cinfo, input_buf, *in_row_group_ctr,
output_buf + *out_row_ctr);
/* Adjust counts */
(*out_row_ctr)++;
(*in_row_group_ctr)++;
}
/*
* These are the routines invoked by the control routines to do
* the actual upsampling/conversion. One row group is processed per call.
*
* Note: since we may be writing directly into application-supplied buffers,
* we have to be honest about the output width; we can't assume the buffer
* has been rounded up to an even width.
*/
/*
* Upsample and color convert for the case of 2:1 horizontal and 1:1 vertical.
*/
METHODDEF(void)
h2v1_merged_upsample(j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
JDIMENSION in_row_group_ctr, JSAMPARRAY output_buf)
{
switch (cinfo->out_color_space) {
case JCS_EXT_RGB:
extrgb_h2v1_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
output_buf);
break;
case JCS_EXT_RGBX:
case JCS_EXT_RGBA:
extrgbx_h2v1_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
output_buf);
break;
case JCS_EXT_BGR:
extbgr_h2v1_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
output_buf);
break;
case JCS_EXT_BGRX:
case JCS_EXT_BGRA:
extbgrx_h2v1_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
output_buf);
break;
case JCS_EXT_XBGR:
case JCS_EXT_ABGR:
extxbgr_h2v1_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
output_buf);
break;
case JCS_EXT_XRGB:
case JCS_EXT_ARGB:
extxrgb_h2v1_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
output_buf);
break;
default:
h2v1_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
output_buf);
break;
}
}
/*
* Upsample and color convert for the case of 2:1 horizontal and 2:1 vertical.
*/
METHODDEF(void)
h2v2_merged_upsample(j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
JDIMENSION in_row_group_ctr, JSAMPARRAY output_buf)
{
switch (cinfo->out_color_space) {
case JCS_EXT_RGB:
extrgb_h2v2_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
output_buf);
break;
case JCS_EXT_RGBX:
case JCS_EXT_RGBA:
extrgbx_h2v2_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
output_buf);
break;
case JCS_EXT_BGR:
extbgr_h2v2_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
output_buf);
break;
case JCS_EXT_BGRX:
case JCS_EXT_BGRA:
extbgrx_h2v2_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
output_buf);
break;
case JCS_EXT_XBGR:
case JCS_EXT_ABGR:
extxbgr_h2v2_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
output_buf);
break;
case JCS_EXT_XRGB:
case JCS_EXT_ARGB:
extxrgb_h2v2_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
output_buf);
break;
default:
h2v2_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
output_buf);
break;
}
}
/*
* RGB565 conversion
*/
#define PACK_SHORT_565_LE(r, g, b) ((((r) << 8) & 0xF800) | \
(((g) << 3) & 0x7E0) | ((b) >> 3))
#define PACK_SHORT_565_BE(r, g, b) (((r) & 0xF8) | ((g) >> 5) | \
(((g) << 11) & 0xE000) | \
(((b) << 5) & 0x1F00))
#define PACK_TWO_PIXELS_LE(l, r) ((r << 16) | l)
#define PACK_TWO_PIXELS_BE(l, r) ((l << 16) | r)
#define PACK_NEED_ALIGNMENT(ptr) (((size_t)(ptr)) & 3)
#define WRITE_TWO_PIXELS_LE(addr, pixels) { \
((INT16 *)(addr))[0] = (INT16)(pixels); \
((INT16 *)(addr))[1] = (INT16)((pixels) >> 16); \
}
#define WRITE_TWO_PIXELS_BE(addr, pixels) { \
((INT16 *)(addr))[1] = (INT16)(pixels); \
((INT16 *)(addr))[0] = (INT16)((pixels) >> 16); \
}
#define DITHER_565_R(r, dither) ((r) + ((dither) & 0xFF))
#define DITHER_565_G(g, dither) ((g) + (((dither) & 0xFF) >> 1))
#define DITHER_565_B(b, dither) ((b) + ((dither) & 0xFF))
/* Declarations for ordered dithering
*
* We use a 4x4 ordered dither array packed into 32 bits. This array is
* sufficent for dithering RGB888 to RGB565.
*/
#define DITHER_MASK 0x3
#define DITHER_ROTATE(x) ((((x) & 0xFF) << 24) | (((x) >> 8) & 0x00FFFFFF))
static const JLONG dither_matrix[4] = {
0x0008020A,
0x0C040E06,
0x030B0109,
0x0F070D05
};
/* Include inline routines for RGB565 conversion */
#define PACK_SHORT_565 PACK_SHORT_565_LE
#define PACK_TWO_PIXELS PACK_TWO_PIXELS_LE
#define WRITE_TWO_PIXELS WRITE_TWO_PIXELS_LE
#define h2v1_merged_upsample_565_internal h2v1_merged_upsample_565_le
#define h2v1_merged_upsample_565D_internal h2v1_merged_upsample_565D_le
#define h2v2_merged_upsample_565_internal h2v2_merged_upsample_565_le
#define h2v2_merged_upsample_565D_internal h2v2_merged_upsample_565D_le
#include "jdmrg565.c"
#undef PACK_SHORT_565
#undef PACK_TWO_PIXELS
#undef WRITE_TWO_PIXELS
#undef h2v1_merged_upsample_565_internal
#undef h2v1_merged_upsample_565D_internal
#undef h2v2_merged_upsample_565_internal
#undef h2v2_merged_upsample_565D_internal
#define PACK_SHORT_565 PACK_SHORT_565_BE
#define PACK_TWO_PIXELS PACK_TWO_PIXELS_BE
#define WRITE_TWO_PIXELS WRITE_TWO_PIXELS_BE
#define h2v1_merged_upsample_565_internal h2v1_merged_upsample_565_be
#define h2v1_merged_upsample_565D_internal h2v1_merged_upsample_565D_be
#define h2v2_merged_upsample_565_internal h2v2_merged_upsample_565_be
#define h2v2_merged_upsample_565D_internal h2v2_merged_upsample_565D_be
#include "jdmrg565.c"
#undef PACK_SHORT_565
#undef PACK_TWO_PIXELS
#undef WRITE_TWO_PIXELS
#undef h2v1_merged_upsample_565_internal
#undef h2v1_merged_upsample_565D_internal
#undef h2v2_merged_upsample_565_internal
#undef h2v2_merged_upsample_565D_internal
static INLINE boolean is_big_endian(void)
{
int test_value = 1;
if (*(char *)&test_value != 1)
return TRUE;
return FALSE;
}
METHODDEF(void)
h2v1_merged_upsample_565(j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
JDIMENSION in_row_group_ctr, JSAMPARRAY output_buf)
{
if (is_big_endian())
h2v1_merged_upsample_565_be(cinfo, input_buf, in_row_group_ctr,
output_buf);
else
h2v1_merged_upsample_565_le(cinfo, input_buf, in_row_group_ctr,
output_buf);
}
METHODDEF(void)
h2v1_merged_upsample_565D(j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
JDIMENSION in_row_group_ctr, JSAMPARRAY output_buf)
{
if (is_big_endian())
h2v1_merged_upsample_565D_be(cinfo, input_buf, in_row_group_ctr,
output_buf);
else
h2v1_merged_upsample_565D_le(cinfo, input_buf, in_row_group_ctr,
output_buf);
}
METHODDEF(void)
h2v2_merged_upsample_565(j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
JDIMENSION in_row_group_ctr, JSAMPARRAY output_buf)
{
if (is_big_endian())
h2v2_merged_upsample_565_be(cinfo, input_buf, in_row_group_ctr,
output_buf);
else
h2v2_merged_upsample_565_le(cinfo, input_buf, in_row_group_ctr,
output_buf);
}
METHODDEF(void)
h2v2_merged_upsample_565D(j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
JDIMENSION in_row_group_ctr, JSAMPARRAY output_buf)
{
if (is_big_endian())
h2v2_merged_upsample_565D_be(cinfo, input_buf, in_row_group_ctr,
output_buf);
else
h2v2_merged_upsample_565D_le(cinfo, input_buf, in_row_group_ctr,
output_buf);
}
/*
* Module initialization routine for merged upsampling/color conversion.
*
* NB: this is called under the conditions determined by use_merged_upsample()
* in jdmaster.c. That routine MUST correspond to the actual capabilities
* of this module; no safety checks are made here.
*/
GLOBAL(void)
jinit_merged_upsampler(j_decompress_ptr cinfo)
{
my_upsample_ptr upsample;
upsample = (my_upsample_ptr)
(*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_IMAGE,
sizeof(my_upsampler));
cinfo->upsample = (struct jpeg_upsampler *)upsample;
upsample->pub.start_pass = start_pass_merged_upsample;
upsample->pub.need_context_rows = FALSE;
upsample->out_row_width = cinfo->output_width * cinfo->out_color_components;
if (cinfo->max_v_samp_factor == 2) {
upsample->pub.upsample = merged_2v_upsample;
if (jsimd_can_h2v2_merged_upsample())
upsample->upmethod = jsimd_h2v2_merged_upsample;
else
upsample->upmethod = h2v2_merged_upsample;
if (cinfo->out_color_space == JCS_RGB565) {
if (cinfo->dither_mode != JDITHER_NONE) {
upsample->upmethod = h2v2_merged_upsample_565D;
} else {
upsample->upmethod = h2v2_merged_upsample_565;
}
}
/* Allocate a spare row buffer */
upsample->spare_row = (JSAMPROW)
(*cinfo->mem->alloc_large) ((j_common_ptr)cinfo, JPOOL_IMAGE,
(size_t)(upsample->out_row_width * sizeof(JSAMPLE)));
} else {
upsample->pub.upsample = merged_1v_upsample;
if (jsimd_can_h2v1_merged_upsample())
upsample->upmethod = jsimd_h2v1_merged_upsample;
else
upsample->upmethod = h2v1_merged_upsample;
if (cinfo->out_color_space == JCS_RGB565) {
if (cinfo->dither_mode != JDITHER_NONE) {
upsample->upmethod = h2v1_merged_upsample_565D;
} else {
upsample->upmethod = h2v1_merged_upsample_565;
}
}
/* No spare row needed */
upsample->spare_row = NULL;
}
build_ycc_rgb_table(cinfo);
}
#endif /* UPSAMPLE_MERGING_SUPPORTED */
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