зеркало из https://github.com/mozilla/gecko-dev.git
464 строки
15 KiB
C
464 строки
15 KiB
C
/*
|
|
* jdmerge.c
|
|
*
|
|
* Copyright (C) 1994-1996, Thomas G. Lane.
|
|
* Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
|
|
* Copyright (C) 2009, 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.
|
|
*
|
|
* 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 "config.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 */
|
|
JMETHOD(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 */
|
|
INT32 * Cr_g_tab; /* => table for Cr to G conversion */
|
|
INT32 * 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 ((INT32) 1 << (SCALEBITS-1))
|
|
#define FIX(x) ((INT32) ((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;
|
|
INT32 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 = (INT32 *)
|
|
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
|
|
(MAXJSAMPLE+1) * SIZEOF(INT32));
|
|
upsample->Cb_g_tab = (INT32 *)
|
|
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
|
|
(MAXJSAMPLE+1) * SIZEOF(INT32));
|
|
|
|
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. */
|
|
jcopy_sample_rows(& upsample->spare_row, 0, output_buf + *out_row_ctr, 0,
|
|
1, upsample->out_row_width);
|
|
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;
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* 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;
|
|
/* 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;
|
|
/* No spare row needed */
|
|
upsample->spare_row = NULL;
|
|
}
|
|
|
|
build_ycc_rgb_table(cinfo);
|
|
}
|
|
|
|
#endif /* UPSAMPLE_MERGING_SUPPORTED */
|