4 * This file was part of the Independent JPEG Group's software:
5 * Copyright (C) 1991-1996, Thomas G. Lane.
6 * libjpeg-turbo Modifications:
7 * Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
8 * Copyright (C) 2009-2012, 2015, D. R. Commander.
9 * Copyright (C) 2014, MIPS Technologies, Inc., California.
10 * For conditions of distribution and use, see the accompanying README.ijg
13 * This file contains input colorspace conversion routines.
16 #define JPEG_INTERNALS
20 #include "jconfigint.h"
23 /* Private subobject */
26 struct jpeg_color_converter pub
; /* public fields */
28 /* Private state for RGB->YCC conversion */
29 JLONG
*rgb_ycc_tab
; /* => table for RGB to YCbCr conversion */
32 typedef my_color_converter
*my_cconvert_ptr
;
35 /**************** RGB -> YCbCr conversion: most common case **************/
38 * YCbCr is defined per CCIR 601-1, except that Cb and Cr are
39 * normalized to the range 0..MAXJSAMPLE rather than -0.5 .. 0.5.
40 * The conversion equations to be implemented are therefore
41 * Y = 0.29900 * R + 0.58700 * G + 0.11400 * B
42 * Cb = -0.16874 * R - 0.33126 * G + 0.50000 * B + CENTERJSAMPLE
43 * Cr = 0.50000 * R - 0.41869 * G - 0.08131 * B + CENTERJSAMPLE
44 * (These numbers are derived from TIFF 6.0 section 21, dated 3-June-92.)
45 * Note: older versions of the IJG code used a zero offset of MAXJSAMPLE/2,
46 * rather than CENTERJSAMPLE, for Cb and Cr. This gave equal positive and
47 * negative swings for Cb/Cr, but meant that grayscale values (Cb=Cr=0)
48 * were not represented exactly. Now we sacrifice exact representation of
49 * maximum red and maximum blue in order to get exact grayscales.
51 * To avoid floating-point arithmetic, we represent the fractional constants
52 * as integers scaled up by 2^16 (about 4 digits precision); we have to divide
53 * the products by 2^16, with appropriate rounding, to get the correct answer.
55 * For even more speed, we avoid doing any multiplications in the inner loop
56 * by precalculating the constants times R,G,B for all possible values.
57 * For 8-bit JSAMPLEs this is very reasonable (only 256 entries per table);
58 * for 12-bit samples it is still acceptable. It's not very reasonable for
59 * 16-bit samples, but if you want lossless storage you shouldn't be changing
61 * The CENTERJSAMPLE offsets and the rounding fudge-factor of 0.5 are included
62 * in the tables to save adding them separately in the inner loop.
65 #define SCALEBITS 16 /* speediest right-shift on some machines */
66 #define CBCR_OFFSET ((JLONG)CENTERJSAMPLE << SCALEBITS)
67 #define ONE_HALF ((JLONG)1 << (SCALEBITS - 1))
68 #define FIX(x) ((JLONG)((x) * (1L << SCALEBITS) + 0.5))
70 /* We allocate one big table and divide it up into eight parts, instead of
71 * doing eight alloc_small requests. This lets us use a single table base
72 * address, which can be held in a register in the inner loops on many
73 * machines (more than can hold all eight addresses, anyway).
76 #define R_Y_OFF 0 /* offset to R => Y section */
77 #define G_Y_OFF (1 * (MAXJSAMPLE + 1)) /* offset to G => Y section */
78 #define B_Y_OFF (2 * (MAXJSAMPLE + 1)) /* etc. */
79 #define R_CB_OFF (3 * (MAXJSAMPLE + 1))
80 #define G_CB_OFF (4 * (MAXJSAMPLE + 1))
81 #define B_CB_OFF (5 * (MAXJSAMPLE + 1))
82 #define R_CR_OFF B_CB_OFF /* B=>Cb, R=>Cr are the same */
83 #define G_CR_OFF (6 * (MAXJSAMPLE + 1))
84 #define B_CR_OFF (7 * (MAXJSAMPLE + 1))
85 #define TABLE_SIZE (8 * (MAXJSAMPLE + 1))
88 /* Include inline routines for colorspace extensions */
96 #define RGB_RED EXT_RGB_RED
97 #define RGB_GREEN EXT_RGB_GREEN
98 #define RGB_BLUE EXT_RGB_BLUE
99 #define RGB_PIXELSIZE EXT_RGB_PIXELSIZE
100 #define rgb_ycc_convert_internal extrgb_ycc_convert_internal
101 #define rgb_gray_convert_internal extrgb_gray_convert_internal
102 #define rgb_rgb_convert_internal extrgb_rgb_convert_internal
103 #include "jccolext.c"
108 #undef rgb_ycc_convert_internal
109 #undef rgb_gray_convert_internal
110 #undef rgb_rgb_convert_internal
112 #define RGB_RED EXT_RGBX_RED
113 #define RGB_GREEN EXT_RGBX_GREEN
114 #define RGB_BLUE EXT_RGBX_BLUE
115 #define RGB_PIXELSIZE EXT_RGBX_PIXELSIZE
116 #define rgb_ycc_convert_internal extrgbx_ycc_convert_internal
117 #define rgb_gray_convert_internal extrgbx_gray_convert_internal
118 #define rgb_rgb_convert_internal extrgbx_rgb_convert_internal
119 #include "jccolext.c"
124 #undef rgb_ycc_convert_internal
125 #undef rgb_gray_convert_internal
126 #undef rgb_rgb_convert_internal
128 #define RGB_RED EXT_BGR_RED
129 #define RGB_GREEN EXT_BGR_GREEN
130 #define RGB_BLUE EXT_BGR_BLUE
131 #define RGB_PIXELSIZE EXT_BGR_PIXELSIZE
132 #define rgb_ycc_convert_internal extbgr_ycc_convert_internal
133 #define rgb_gray_convert_internal extbgr_gray_convert_internal
134 #define rgb_rgb_convert_internal extbgr_rgb_convert_internal
135 #include "jccolext.c"
140 #undef rgb_ycc_convert_internal
141 #undef rgb_gray_convert_internal
142 #undef rgb_rgb_convert_internal
144 #define RGB_RED EXT_BGRX_RED
145 #define RGB_GREEN EXT_BGRX_GREEN
146 #define RGB_BLUE EXT_BGRX_BLUE
147 #define RGB_PIXELSIZE EXT_BGRX_PIXELSIZE
148 #define rgb_ycc_convert_internal extbgrx_ycc_convert_internal
149 #define rgb_gray_convert_internal extbgrx_gray_convert_internal
150 #define rgb_rgb_convert_internal extbgrx_rgb_convert_internal
151 #include "jccolext.c"
156 #undef rgb_ycc_convert_internal
157 #undef rgb_gray_convert_internal
158 #undef rgb_rgb_convert_internal
160 #define RGB_RED EXT_XBGR_RED
161 #define RGB_GREEN EXT_XBGR_GREEN
162 #define RGB_BLUE EXT_XBGR_BLUE
163 #define RGB_PIXELSIZE EXT_XBGR_PIXELSIZE
164 #define rgb_ycc_convert_internal extxbgr_ycc_convert_internal
165 #define rgb_gray_convert_internal extxbgr_gray_convert_internal
166 #define rgb_rgb_convert_internal extxbgr_rgb_convert_internal
167 #include "jccolext.c"
172 #undef rgb_ycc_convert_internal
173 #undef rgb_gray_convert_internal
174 #undef rgb_rgb_convert_internal
176 #define RGB_RED EXT_XRGB_RED
177 #define RGB_GREEN EXT_XRGB_GREEN
178 #define RGB_BLUE EXT_XRGB_BLUE
179 #define RGB_PIXELSIZE EXT_XRGB_PIXELSIZE
180 #define rgb_ycc_convert_internal extxrgb_ycc_convert_internal
181 #define rgb_gray_convert_internal extxrgb_gray_convert_internal
182 #define rgb_rgb_convert_internal extxrgb_rgb_convert_internal
183 #include "jccolext.c"
188 #undef rgb_ycc_convert_internal
189 #undef rgb_gray_convert_internal
190 #undef rgb_rgb_convert_internal
194 * Initialize for RGB->YCC colorspace conversion.
198 rgb_ycc_start(j_compress_ptr cinfo
)
200 my_cconvert_ptr cconvert
= (my_cconvert_ptr
)cinfo
->cconvert
;
204 /* Allocate and fill in the conversion tables. */
205 cconvert
->rgb_ycc_tab
= rgb_ycc_tab
= (JLONG
*)
206 (*cinfo
->mem
->alloc_small
) ((j_common_ptr
)cinfo
, JPOOL_IMAGE
,
207 (TABLE_SIZE
* sizeof(JLONG
)));
209 for (i
= 0; i
<= MAXJSAMPLE
; i
++) {
210 rgb_ycc_tab
[i
+ R_Y_OFF
] = FIX(0.29900) * i
;
211 rgb_ycc_tab
[i
+ G_Y_OFF
] = FIX(0.58700) * i
;
212 rgb_ycc_tab
[i
+ B_Y_OFF
] = FIX(0.11400) * i
+ ONE_HALF
;
213 rgb_ycc_tab
[i
+ R_CB_OFF
] = (-FIX(0.16874)) * i
;
214 rgb_ycc_tab
[i
+ G_CB_OFF
] = (-FIX(0.33126)) * i
;
215 /* We use a rounding fudge-factor of 0.5-epsilon for Cb and Cr.
216 * This ensures that the maximum output will round to MAXJSAMPLE
217 * not MAXJSAMPLE+1, and thus that we don't have to range-limit.
219 rgb_ycc_tab
[i
+ B_CB_OFF
] = FIX(0.50000) * i
+ CBCR_OFFSET
+ ONE_HALF
- 1;
220 /* B=>Cb and R=>Cr tables are the same
221 rgb_ycc_tab[i + R_CR_OFF] = FIX(0.50000) * i + CBCR_OFFSET + ONE_HALF - 1;
223 rgb_ycc_tab
[i
+ G_CR_OFF
] = (-FIX(0.41869)) * i
;
224 rgb_ycc_tab
[i
+ B_CR_OFF
] = (-FIX(0.08131)) * i
;
230 * Convert some rows of samples to the JPEG colorspace.
234 rgb_ycc_convert(j_compress_ptr cinfo
, JSAMPARRAY input_buf
,
235 JSAMPIMAGE output_buf
, JDIMENSION output_row
, int num_rows
)
237 switch (cinfo
->in_color_space
) {
239 extrgb_ycc_convert_internal(cinfo
, input_buf
, output_buf
, output_row
,
244 extrgbx_ycc_convert_internal(cinfo
, input_buf
, output_buf
, output_row
,
248 extbgr_ycc_convert_internal(cinfo
, input_buf
, output_buf
, output_row
,
253 extbgrx_ycc_convert_internal(cinfo
, input_buf
, output_buf
, output_row
,
258 extxbgr_ycc_convert_internal(cinfo
, input_buf
, output_buf
, output_row
,
263 extxrgb_ycc_convert_internal(cinfo
, input_buf
, output_buf
, output_row
,
267 rgb_ycc_convert_internal(cinfo
, input_buf
, output_buf
, output_row
,
274 /**************** Cases other than RGB -> YCbCr **************/
278 * Convert some rows of samples to the JPEG colorspace.
282 rgb_gray_convert(j_compress_ptr cinfo
, JSAMPARRAY input_buf
,
283 JSAMPIMAGE output_buf
, JDIMENSION output_row
, int num_rows
)
285 switch (cinfo
->in_color_space
) {
287 extrgb_gray_convert_internal(cinfo
, input_buf
, output_buf
, output_row
,
292 extrgbx_gray_convert_internal(cinfo
, input_buf
, output_buf
, output_row
,
296 extbgr_gray_convert_internal(cinfo
, input_buf
, output_buf
, output_row
,
301 extbgrx_gray_convert_internal(cinfo
, input_buf
, output_buf
, output_row
,
306 extxbgr_gray_convert_internal(cinfo
, input_buf
, output_buf
, output_row
,
311 extxrgb_gray_convert_internal(cinfo
, input_buf
, output_buf
, output_row
,
315 rgb_gray_convert_internal(cinfo
, input_buf
, output_buf
, output_row
,
323 * Extended RGB to plain RGB conversion
327 rgb_rgb_convert(j_compress_ptr cinfo
, JSAMPARRAY input_buf
,
328 JSAMPIMAGE output_buf
, JDIMENSION output_row
, int num_rows
)
330 switch (cinfo
->in_color_space
) {
332 extrgb_rgb_convert_internal(cinfo
, input_buf
, output_buf
, output_row
,
337 extrgbx_rgb_convert_internal(cinfo
, input_buf
, output_buf
, output_row
,
341 extbgr_rgb_convert_internal(cinfo
, input_buf
, output_buf
, output_row
,
346 extbgrx_rgb_convert_internal(cinfo
, input_buf
, output_buf
, output_row
,
351 extxbgr_rgb_convert_internal(cinfo
, input_buf
, output_buf
, output_row
,
356 extxrgb_rgb_convert_internal(cinfo
, input_buf
, output_buf
, output_row
,
360 rgb_rgb_convert_internal(cinfo
, input_buf
, output_buf
, output_row
,
368 * Convert some rows of samples to the JPEG colorspace.
369 * This version handles Adobe-style CMYK->YCCK conversion,
370 * where we convert R=1-C, G=1-M, and B=1-Y to YCbCr using the same
371 * conversion as above, while passing K (black) unchanged.
372 * We assume rgb_ycc_start has been called.
376 cmyk_ycck_convert(j_compress_ptr cinfo
, JSAMPARRAY input_buf
,
377 JSAMPIMAGE output_buf
, JDIMENSION output_row
, int num_rows
)
379 my_cconvert_ptr cconvert
= (my_cconvert_ptr
)cinfo
->cconvert
;
380 register int r
, g
, b
;
381 register JLONG
*ctab
= cconvert
->rgb_ycc_tab
;
382 register JSAMPROW inptr
;
383 register JSAMPROW outptr0
, outptr1
, outptr2
, outptr3
;
384 register JDIMENSION col
;
385 JDIMENSION num_cols
= cinfo
->image_width
;
387 while (--num_rows
>= 0) {
388 inptr
= *input_buf
++;
389 outptr0
= output_buf
[0][output_row
];
390 outptr1
= output_buf
[1][output_row
];
391 outptr2
= output_buf
[2][output_row
];
392 outptr3
= output_buf
[3][output_row
];
394 for (col
= 0; col
< num_cols
; col
++) {
395 r
= MAXJSAMPLE
- GETJSAMPLE(inptr
[0]);
396 g
= MAXJSAMPLE
- GETJSAMPLE(inptr
[1]);
397 b
= MAXJSAMPLE
- GETJSAMPLE(inptr
[2]);
398 /* K passes through as-is */
399 outptr3
[col
] = inptr
[3]; /* don't need GETJSAMPLE here */
401 /* If the inputs are 0..MAXJSAMPLE, the outputs of these equations
402 * must be too; we do not need an explicit range-limiting operation.
403 * Hence the value being shifted is never negative, and we don't
404 * need the general RIGHT_SHIFT macro.
407 outptr0
[col
] = (JSAMPLE
)((ctab
[r
+ R_Y_OFF
] + ctab
[g
+ G_Y_OFF
] +
408 ctab
[b
+ B_Y_OFF
]) >> SCALEBITS
);
410 outptr1
[col
] = (JSAMPLE
)((ctab
[r
+ R_CB_OFF
] + ctab
[g
+ G_CB_OFF
] +
411 ctab
[b
+ B_CB_OFF
]) >> SCALEBITS
);
413 outptr2
[col
] = (JSAMPLE
)((ctab
[r
+ R_CR_OFF
] + ctab
[g
+ G_CR_OFF
] +
414 ctab
[b
+ B_CR_OFF
]) >> SCALEBITS
);
421 * Convert some rows of samples to the JPEG colorspace.
422 * This version handles grayscale output with no conversion.
423 * The source can be either plain grayscale or YCbCr (since Y == gray).
427 grayscale_convert(j_compress_ptr cinfo
, JSAMPARRAY input_buf
,
428 JSAMPIMAGE output_buf
, JDIMENSION output_row
, int num_rows
)
430 register JSAMPROW inptr
;
431 register JSAMPROW outptr
;
432 register JDIMENSION col
;
433 JDIMENSION num_cols
= cinfo
->image_width
;
434 int instride
= cinfo
->input_components
;
436 while (--num_rows
>= 0) {
437 inptr
= *input_buf
++;
438 outptr
= output_buf
[0][output_row
];
440 for (col
= 0; col
< num_cols
; col
++) {
441 outptr
[col
] = inptr
[0]; /* don't need GETJSAMPLE() here */
449 * Convert some rows of samples to the JPEG colorspace.
450 * This version handles multi-component colorspaces without conversion.
451 * We assume input_components == num_components.
455 null_convert(j_compress_ptr cinfo
, JSAMPARRAY input_buf
, JSAMPIMAGE output_buf
,
456 JDIMENSION output_row
, int num_rows
)
458 register JSAMPROW inptr
;
459 register JSAMPROW outptr
, outptr0
, outptr1
, outptr2
, outptr3
;
460 register JDIMENSION col
;
462 int nc
= cinfo
->num_components
;
463 JDIMENSION num_cols
= cinfo
->image_width
;
466 while (--num_rows
>= 0) {
467 inptr
= *input_buf
++;
468 outptr0
= output_buf
[0][output_row
];
469 outptr1
= output_buf
[1][output_row
];
470 outptr2
= output_buf
[2][output_row
];
472 for (col
= 0; col
< num_cols
; col
++) {
473 outptr0
[col
] = *inptr
++;
474 outptr1
[col
] = *inptr
++;
475 outptr2
[col
] = *inptr
++;
478 } else if (nc
== 4) {
479 while (--num_rows
>= 0) {
480 inptr
= *input_buf
++;
481 outptr0
= output_buf
[0][output_row
];
482 outptr1
= output_buf
[1][output_row
];
483 outptr2
= output_buf
[2][output_row
];
484 outptr3
= output_buf
[3][output_row
];
486 for (col
= 0; col
< num_cols
; col
++) {
487 outptr0
[col
] = *inptr
++;
488 outptr1
[col
] = *inptr
++;
489 outptr2
[col
] = *inptr
++;
490 outptr3
[col
] = *inptr
++;
494 while (--num_rows
>= 0) {
495 /* It seems fastest to make a separate pass for each component. */
496 for (ci
= 0; ci
< nc
; ci
++) {
498 outptr
= output_buf
[ci
][output_row
];
499 for (col
= 0; col
< num_cols
; col
++) {
500 outptr
[col
] = inptr
[ci
]; /* don't need GETJSAMPLE() here */
512 * Empty method for start_pass.
516 null_method(j_compress_ptr cinfo
)
523 * Module initialization routine for input colorspace conversion.
527 jinit_color_converter(j_compress_ptr cinfo
)
529 my_cconvert_ptr cconvert
;
531 cconvert
= (my_cconvert_ptr
)
532 (*cinfo
->mem
->alloc_small
) ((j_common_ptr
)cinfo
, JPOOL_IMAGE
,
533 sizeof(my_color_converter
));
534 cinfo
->cconvert
= (struct jpeg_color_converter
*)cconvert
;
535 /* set start_pass to null method until we find out differently */
536 cconvert
->pub
.start_pass
= null_method
;
538 /* Make sure input_components agrees with in_color_space */
539 switch (cinfo
->in_color_space
) {
541 if (cinfo
->input_components
!= 1)
542 ERREXIT(cinfo
, JERR_BAD_IN_COLORSPACE
);
556 if (cinfo
->input_components
!= rgb_pixelsize
[cinfo
->in_color_space
])
557 ERREXIT(cinfo
, JERR_BAD_IN_COLORSPACE
);
561 if (cinfo
->input_components
!= 3)
562 ERREXIT(cinfo
, JERR_BAD_IN_COLORSPACE
);
567 if (cinfo
->input_components
!= 4)
568 ERREXIT(cinfo
, JERR_BAD_IN_COLORSPACE
);
571 default: /* JCS_UNKNOWN can be anything */
572 if (cinfo
->input_components
< 1)
573 ERREXIT(cinfo
, JERR_BAD_IN_COLORSPACE
);
577 /* Check num_components, set conversion method based on requested space */
578 switch (cinfo
->jpeg_color_space
) {
580 if (cinfo
->num_components
!= 1)
581 ERREXIT(cinfo
, JERR_BAD_J_COLORSPACE
);
582 if (cinfo
->in_color_space
== JCS_GRAYSCALE
)
583 cconvert
->pub
.color_convert
= grayscale_convert
;
584 else if (cinfo
->in_color_space
== JCS_RGB
||
585 cinfo
->in_color_space
== JCS_EXT_RGB
||
586 cinfo
->in_color_space
== JCS_EXT_RGBX
||
587 cinfo
->in_color_space
== JCS_EXT_BGR
||
588 cinfo
->in_color_space
== JCS_EXT_BGRX
||
589 cinfo
->in_color_space
== JCS_EXT_XBGR
||
590 cinfo
->in_color_space
== JCS_EXT_XRGB
||
591 cinfo
->in_color_space
== JCS_EXT_RGBA
||
592 cinfo
->in_color_space
== JCS_EXT_BGRA
||
593 cinfo
->in_color_space
== JCS_EXT_ABGR
||
594 cinfo
->in_color_space
== JCS_EXT_ARGB
) {
595 if (jsimd_can_rgb_gray())
596 cconvert
->pub
.color_convert
= jsimd_rgb_gray_convert
;
598 cconvert
->pub
.start_pass
= rgb_ycc_start
;
599 cconvert
->pub
.color_convert
= rgb_gray_convert
;
601 } else if (cinfo
->in_color_space
== JCS_YCbCr
)
602 cconvert
->pub
.color_convert
= grayscale_convert
;
604 ERREXIT(cinfo
, JERR_CONVERSION_NOTIMPL
);
608 if (cinfo
->num_components
!= 3)
609 ERREXIT(cinfo
, JERR_BAD_J_COLORSPACE
);
610 if (rgb_red
[cinfo
->in_color_space
] == 0 &&
611 rgb_green
[cinfo
->in_color_space
] == 1 &&
612 rgb_blue
[cinfo
->in_color_space
] == 2 &&
613 rgb_pixelsize
[cinfo
->in_color_space
] == 3) {
614 #if defined(__mips__)
615 if (jsimd_c_can_null_convert())
616 cconvert
->pub
.color_convert
= jsimd_c_null_convert
;
619 cconvert
->pub
.color_convert
= null_convert
;
620 } else if (cinfo
->in_color_space
== JCS_RGB
||
621 cinfo
->in_color_space
== JCS_EXT_RGB
||
622 cinfo
->in_color_space
== JCS_EXT_RGBX
||
623 cinfo
->in_color_space
== JCS_EXT_BGR
||
624 cinfo
->in_color_space
== JCS_EXT_BGRX
||
625 cinfo
->in_color_space
== JCS_EXT_XBGR
||
626 cinfo
->in_color_space
== JCS_EXT_XRGB
||
627 cinfo
->in_color_space
== JCS_EXT_RGBA
||
628 cinfo
->in_color_space
== JCS_EXT_BGRA
||
629 cinfo
->in_color_space
== JCS_EXT_ABGR
||
630 cinfo
->in_color_space
== JCS_EXT_ARGB
)
631 cconvert
->pub
.color_convert
= rgb_rgb_convert
;
633 ERREXIT(cinfo
, JERR_CONVERSION_NOTIMPL
);
637 if (cinfo
->num_components
!= 3)
638 ERREXIT(cinfo
, JERR_BAD_J_COLORSPACE
);
639 if (cinfo
->in_color_space
== JCS_RGB
||
640 cinfo
->in_color_space
== JCS_EXT_RGB
||
641 cinfo
->in_color_space
== JCS_EXT_RGBX
||
642 cinfo
->in_color_space
== JCS_EXT_BGR
||
643 cinfo
->in_color_space
== JCS_EXT_BGRX
||
644 cinfo
->in_color_space
== JCS_EXT_XBGR
||
645 cinfo
->in_color_space
== JCS_EXT_XRGB
||
646 cinfo
->in_color_space
== JCS_EXT_RGBA
||
647 cinfo
->in_color_space
== JCS_EXT_BGRA
||
648 cinfo
->in_color_space
== JCS_EXT_ABGR
||
649 cinfo
->in_color_space
== JCS_EXT_ARGB
) {
650 if (jsimd_can_rgb_ycc())
651 cconvert
->pub
.color_convert
= jsimd_rgb_ycc_convert
;
653 cconvert
->pub
.start_pass
= rgb_ycc_start
;
654 cconvert
->pub
.color_convert
= rgb_ycc_convert
;
656 } else if (cinfo
->in_color_space
== JCS_YCbCr
) {
657 #if defined(__mips__)
658 if (jsimd_c_can_null_convert())
659 cconvert
->pub
.color_convert
= jsimd_c_null_convert
;
662 cconvert
->pub
.color_convert
= null_convert
;
664 ERREXIT(cinfo
, JERR_CONVERSION_NOTIMPL
);
668 if (cinfo
->num_components
!= 4)
669 ERREXIT(cinfo
, JERR_BAD_J_COLORSPACE
);
670 if (cinfo
->in_color_space
== JCS_CMYK
) {
671 #if defined(__mips__)
672 if (jsimd_c_can_null_convert())
673 cconvert
->pub
.color_convert
= jsimd_c_null_convert
;
676 cconvert
->pub
.color_convert
= null_convert
;
678 ERREXIT(cinfo
, JERR_CONVERSION_NOTIMPL
);
682 if (cinfo
->num_components
!= 4)
683 ERREXIT(cinfo
, JERR_BAD_J_COLORSPACE
);
684 if (cinfo
->in_color_space
== JCS_CMYK
) {
685 cconvert
->pub
.start_pass
= rgb_ycc_start
;
686 cconvert
->pub
.color_convert
= cmyk_ycck_convert
;
687 } else if (cinfo
->in_color_space
== JCS_YCCK
) {
688 #if defined(__mips__)
689 if (jsimd_c_can_null_convert())
690 cconvert
->pub
.color_convert
= jsimd_c_null_convert
;
693 cconvert
->pub
.color_convert
= null_convert
;
695 ERREXIT(cinfo
, JERR_CONVERSION_NOTIMPL
);
698 default: /* allow null conversion of JCS_UNKNOWN */
699 if (cinfo
->jpeg_color_space
!= cinfo
->in_color_space
||
700 cinfo
->num_components
!= cinfo
->input_components
)
701 ERREXIT(cinfo
, JERR_CONVERSION_NOTIMPL
);
702 #if defined(__mips__)
703 if (jsimd_c_can_null_convert())
704 cconvert
->pub
.color_convert
= jsimd_c_null_convert
;
707 cconvert
->pub
.color_convert
= null_convert
;