• file
• revisions
• annotate
• diff
• comparison
• raw

media/libjpeg/jdcolext.c@b8a032363ba2 (annotated)

media/libjpeg/jdcolext.c

Thu, 22 Jan 2015 13:21:57 +0100

author

Michael Schloh von Bennewitz <michael@schloh.com>

date

Thu, 22 Jan 2015 13:21:57 +0100

branch

TOR_BUG_9701

changeset 15

b8a032363ba2

permissions

-rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

michael@0	1	/*
michael@0	2	* jdcolext.c
michael@0	3	*
michael@0	4	* This file was part of the Independent JPEG Group's software:
michael@0	5	* Copyright (C) 1991-1997, Thomas G. Lane.
michael@0	6	* libjpeg-turbo Modifications:
michael@0	7	* Copyright (C) 2009, 2011, D. R. Commander.
michael@0	8	* For conditions of distribution and use, see the accompanying README file.
michael@0	9	*
michael@0	10	* This file contains output colorspace conversion routines.
michael@0	11	*/
michael@0	12
michael@0	13
michael@0	14	/* This file is included by jdcolor.c */
michael@0	15
michael@0	16
michael@0	17	/*
michael@0	18	* Convert some rows of samples to the output colorspace.
michael@0	19	*
michael@0	20	* Note that we change from noninterleaved, one-plane-per-component format
michael@0	21	* to interleaved-pixel format. The output buffer is therefore three times
michael@0	22	* as wide as the input buffer.
michael@0	23	* A starting row offset is provided only for the input buffer. The caller
michael@0	24	* can easily adjust the passed output_buf value to accommodate any row
michael@0	25	* offset required on that side.
michael@0	26	*/
michael@0	27
michael@0	28	INLINE
michael@0	29	LOCAL(void)
michael@0	30	ycc_rgb_convert_internal (j_decompress_ptr cinfo,
michael@0	31	JSAMPIMAGE input_buf, JDIMENSION input_row,
michael@0	32	JSAMPARRAY output_buf, int num_rows)
michael@0	33	{
michael@0	34	my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert;
michael@0	35	register int y, cb, cr;
michael@0	36	register JSAMPROW outptr;
michael@0	37	register JSAMPROW inptr0, inptr1, inptr2;
michael@0	38	register JDIMENSION col;
michael@0	39	JDIMENSION num_cols = cinfo->output_width;
michael@0	40	/* copy these pointers into registers if possible */
michael@0	41	register JSAMPLE * range_limit = cinfo->sample_range_limit;
michael@0	42	register int * Crrtab = cconvert->Cr_r_tab;
michael@0	43	register int * Cbbtab = cconvert->Cb_b_tab;
michael@0	44	register INT32 * Crgtab = cconvert->Cr_g_tab;
michael@0	45	register INT32 * Cbgtab = cconvert->Cb_g_tab;
michael@0	46	SHIFT_TEMPS
michael@0	47
michael@0	48	while (--num_rows >= 0) {
michael@0	49	inptr0 = input_buf[0][input_row];
michael@0	50	inptr1 = input_buf[1][input_row];
michael@0	51	inptr2 = input_buf[2][input_row];
michael@0	52	input_row++;
michael@0	53	outptr = *output_buf++;
michael@0	54	for (col = 0; col < num_cols; col++) {
michael@0	55	y = GETJSAMPLE(inptr0[col]);
michael@0	56	cb = GETJSAMPLE(inptr1[col]);
michael@0	57	cr = GETJSAMPLE(inptr2[col]);
michael@0	58	/* Range-limiting is essential due to noise introduced by DCT losses. */
michael@0	59	outptr[RGB_RED] = range_limit[y + Crrtab[cr]];
michael@0	60	outptr[RGB_GREEN] = range_limit[y +
michael@0	61	((int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr],
michael@0	62	SCALEBITS))];
michael@0	63	outptr[RGB_BLUE] = range_limit[y + Cbbtab[cb]];
michael@0	64	/* Set unused byte to 0xFF so it can be interpreted as an opaque */
michael@0	65	/* alpha channel value */
michael@0	66	#ifdef RGB_ALPHA
michael@0	67	outptr[RGB_ALPHA] = 0xFF;
michael@0	68	#endif
michael@0	69	outptr += RGB_PIXELSIZE;
michael@0	70	}
michael@0	71	}
michael@0	72	}
michael@0	73
michael@0	74
michael@0	75	/*
michael@0	76	* Convert grayscale to RGB: just duplicate the graylevel three times.
michael@0	77	* This is provided to support applications that don't want to cope
michael@0	78	* with grayscale as a separate case.
michael@0	79	*/
michael@0	80
michael@0	81	INLINE
michael@0	82	LOCAL(void)
michael@0	83	gray_rgb_convert_internal (j_decompress_ptr cinfo,
michael@0	84	JSAMPIMAGE input_buf, JDIMENSION input_row,
michael@0	85	JSAMPARRAY output_buf, int num_rows)
michael@0	86	{
michael@0	87	register JSAMPROW inptr, outptr;
michael@0	88	register JDIMENSION col;
michael@0	89	JDIMENSION num_cols = cinfo->output_width;
michael@0	90
michael@0	91	while (--num_rows >= 0) {
michael@0	92	inptr = input_buf[0][input_row++];
michael@0	93	outptr = *output_buf++;
michael@0	94	for (col = 0; col < num_cols; col++) {
michael@0	95	/* We can dispense with GETJSAMPLE() here */
michael@0	96	outptr[RGB_RED] = outptr[RGB_GREEN] = outptr[RGB_BLUE] = inptr[col];
michael@0	97	/* Set unused byte to 0xFF so it can be interpreted as an opaque */
michael@0	98	/* alpha channel value */
michael@0	99	#ifdef RGB_ALPHA
michael@0	100	outptr[RGB_ALPHA] = 0xFF;
michael@0	101	#endif
michael@0	102	outptr += RGB_PIXELSIZE;
michael@0	103	}
michael@0	104	}
michael@0	105	}
michael@0	106
michael@0	107
michael@0	108	/*
michael@0	109	* Convert RGB to extended RGB: just swap the order of source pixels
michael@0	110	*/
michael@0	111
michael@0	112	INLINE
michael@0	113	LOCAL(void)
michael@0	114	rgb_rgb_convert_internal (j_decompress_ptr cinfo,
michael@0	115	JSAMPIMAGE input_buf, JDIMENSION input_row,
michael@0	116	JSAMPARRAY output_buf, int num_rows)
michael@0	117	{
michael@0	118	register JSAMPROW inptr0, inptr1, inptr2;
michael@0	119	register JSAMPROW outptr;
michael@0	120	register JDIMENSION col;
michael@0	121	JDIMENSION num_cols = cinfo->output_width;
michael@0	122
michael@0	123	while (--num_rows >= 0) {
michael@0	124	inptr0 = input_buf[0][input_row];
michael@0	125	inptr1 = input_buf[1][input_row];
michael@0	126	inptr2 = input_buf[2][input_row];
michael@0	127	input_row++;
michael@0	128	outptr = *output_buf++;
michael@0	129	for (col = 0; col < num_cols; col++) {
michael@0	130	/* We can dispense with GETJSAMPLE() here */
michael@0	131	outptr[RGB_RED] = inptr0[col];
michael@0	132	outptr[RGB_GREEN] = inptr1[col];
michael@0	133	outptr[RGB_BLUE] = inptr2[col];
michael@0	134	/* Set unused byte to 0xFF so it can be interpreted as an opaque */
michael@0	135	/* alpha channel value */
michael@0	136	#ifdef RGB_ALPHA
michael@0	137	outptr[RGB_ALPHA] = 0xFF;
michael@0	138	#endif
michael@0	139	outptr += RGB_PIXELSIZE;
michael@0	140	}
michael@0	141	}
michael@0	142	}