Updates libjpeg-turbo to 1.1.90 (r677)

third_party/libjpeg_turbo/jdcolor.c

 /*
  * jdcolor.c
  *
  * Copyright (C) 1991-1997, Thomas G. Lane.
  * Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
  * Copyright (C) 2009, 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 output colorspace conversion routines.
  */
 
 #define JPEG_INTERNALS
 #include "jinclude.h"
 #include "jpeglib.h"
 #include "jsimd.h"
 
 
 /* Private subobject */
 
 typedef struct {
   struct jpeg_color_deconverter pub; /* public fields */
 
   /* 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 */
+  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 */
 } my_color_deconverter;
 
 typedef my_color_deconverter * my_cconvert_ptr;
 
 
 /**************** YCbCr -> RGB conversion: most common case **************/
 
 /*
  * YCbCr is defined per CCIR 601-1, except that Cb and Cr are
  * normalized to the range 0..MAXJSAMPLE rather than -0.5 .. 0.5.
  * The conversion equations to be implemented are therefore
- *      R = Y                + 1.40200 * Cr
- *      G = Y - 0.34414 * Cb - 0.71414 * Cr
- *      B = Y + 1.77200 * Cb
+ *      R = Y                + 1.40200 * Cr
+ *      G = Y - 0.34414 * Cb - 0.71414 * Cr
+ *      B = Y + 1.77200 * Cb
  * where Cb and Cr represent the incoming values less CENTERJSAMPLE.
  * (These numbers are derived from TIFF 6.0 section 21, dated 3-June-92.)
  *
  * To avoid floating-point arithmetic, we represent the fractional constants
  * as integers scaled up by 2^16 (about 4 digits precision); we have to divide
  * the products by 2^16, with appropriate rounding, to get the correct answer.
  * Notice that Y, being an integral input, does not contribute any fraction
  * so it need not participate in the rounding.
  *
  * For even more speed, we avoid doing any multiplications in the inner loop
  * by precalculating the constants times Cb and Cr for all possible values.
  * For 8-bit JSAMPLEs this is very reasonable (only 256 entries per table);
  * for 12-bit samples it is still acceptable.  It's not very reasonable for
  * 16-bit samples, but if you want lossless storage you shouldn't be changing
  * colorspace anyway.
  * The Cr=>R and Cb=>B values can be rounded to integers in advance; the
  * values for the G calculation are left scaled up, since we must add them
  * together before rounding.
  */
 
-#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))
+#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))
 
 
 /*
  * Initialize tables for YCC->RGB colorspace conversion.
  */
 
 LOCAL(void)
 build_ycc_rgb_table (j_decompress_ptr cinfo)
 {
   my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert;
   int i;
   INT32 x;
   SHIFT_TEMPS
 
   cconvert->Cr_r_tab = (int *)
     (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
-                                (MAXJSAMPLE+1) * SIZEOF(int));
+                                (MAXJSAMPLE+1) * SIZEOF(int));
   cconvert->Cb_b_tab = (int *)
     (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
-                                (MAXJSAMPLE+1) * SIZEOF(int));
+                                (MAXJSAMPLE+1) * SIZEOF(int));
   cconvert->Cr_g_tab = (INT32 *)
     (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
-                                (MAXJSAMPLE+1) * SIZEOF(INT32));
+                                (MAXJSAMPLE+1) * SIZEOF(INT32));
   cconvert->Cb_g_tab = (INT32 *)
     (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
-                                (MAXJSAMPLE+1) * SIZEOF(INT32));
+                                (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 */
     cconvert->Cr_r_tab[i] = (int)
-                    RIGHT_SHIFT(FIX(1.40200) * x + ONE_HALF, SCALEBITS);
+                    RIGHT_SHIFT(FIX(1.40200) * x + ONE_HALF, SCALEBITS);
     /* Cb=>B value is nearest int to 1.77200 * x */
     cconvert->Cb_b_tab[i] = (int)
-                    RIGHT_SHIFT(FIX(1.77200) * x + ONE_HALF, SCALEBITS);
+                    RIGHT_SHIFT(FIX(1.77200) * x + ONE_HALF, SCALEBITS);
     /* Cr=>G value is scaled-up -0.71414 * x */
     cconvert->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 */
     cconvert->Cb_g_tab[i] = (- FIX(0.34414)) * x + ONE_HALF;
   }
 }
 
 
 /*
  * Convert some rows of samples to the output colorspace.
  *
  * Note that we change from noninterleaved, one-plane-per-component format
  * to interleaved-pixel format.  The output buffer is therefore three times
  * as wide as the input buffer.
  * A starting row offset is provided only for the input buffer.  The caller
  * can easily adjust the passed output_buf value to accommodate any row
  * offset required on that side.
  */
 
 METHODDEF(void)
 ycc_rgb_convert (j_decompress_ptr cinfo,
-                 JSAMPIMAGE input_buf, JDIMENSION input_row,
-                 JSAMPARRAY output_buf, int num_rows)
+                 JSAMPIMAGE input_buf, JDIMENSION input_row,
+                 JSAMPARRAY output_buf, int num_rows)
 {
   my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert;
   register int y, cb, cr;
   register JSAMPROW outptr;
   register JSAMPROW inptr0, inptr1, inptr2;
   register JDIMENSION col;
   JDIMENSION num_cols = cinfo->output_width;
+  int rindex = rgb_red[cinfo->out_color_space];
+  int gindex = rgb_green[cinfo->out_color_space];
+  int bindex = rgb_blue[cinfo->out_color_space];
+  int rgbstride = rgb_pixelsize[cinfo->out_color_space];
   /* copy these pointers into registers if possible */
   register JSAMPLE * range_limit = cinfo->sample_range_limit;
   register int * Crrtab = cconvert->Cr_r_tab;
   register int * Cbbtab = cconvert->Cb_b_tab;
   register INT32 * Crgtab = cconvert->Cr_g_tab;
   register INT32 * Cbgtab = cconvert->Cb_g_tab;
   SHIFT_TEMPS
 
   while (--num_rows >= 0) {
     inptr0 = input_buf[0][input_row];
     inptr1 = input_buf[1][input_row];
     inptr2 = input_buf[2][input_row];
     input_row++;
     outptr = *output_buf++;
     for (col = 0; col < num_cols; col++) {
       y  = GETJSAMPLE(inptr0[col]);
       cb = GETJSAMPLE(inptr1[col]);
       cr = GETJSAMPLE(inptr2[col]);
       /* Range-limiting is essential due to noise introduced by DCT losses. */
-      outptr[rgb_red[cinfo->out_color_space]] =   range_limit[y + Crrtab[cr]];
-      outptr[rgb_green[cinfo->out_color_space]] = range_limit[y +
-                              ((int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr],
-                                                 SCALEBITS))];
-      outptr[rgb_blue[cinfo->out_color_space]] =  range_limit[y + Cbbtab[cb]];
-      outptr += rgb_pixelsize[cinfo->out_color_space];
+      outptr[rindex] =   range_limit[y + Crrtab[cr]];
+      outptr[gindex] = range_limit[y +
+                              ((int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr],
+                                                 SCALEBITS))];
+      outptr[bindex] =  range_limit[y + Cbbtab[cb]];
+      outptr += rgbstride;
     }
   }
 }
 
 
 /**************** Cases other than YCbCr -> RGB **************/
 
 
 /*
  * Color conversion for no colorspace change: just copy the data,
  * converting from separate-planes to interleaved representation.
  */
 
 METHODDEF(void)
 null_convert (j_decompress_ptr cinfo,
-              JSAMPIMAGE input_buf, JDIMENSION input_row,
-              JSAMPARRAY output_buf, int num_rows)
+              JSAMPIMAGE input_buf, JDIMENSION input_row,
+              JSAMPARRAY output_buf, int num_rows)
 {
   register JSAMPROW inptr, outptr;
   register JDIMENSION count;
   register int num_components = cinfo->num_components;
   JDIMENSION num_cols = cinfo->output_width;
   int ci;
 
   while (--num_rows >= 0) {
     for (ci = 0; ci < num_components; ci++) {
       inptr = input_buf[ci][input_row];
       outptr = output_buf[0] + ci;
       for (count = num_cols; count > 0; count--) {
-        *outptr = *inptr++;     /* needn't bother with GETJSAMPLE() here */
-        outptr += num_components;
+        *outptr = *inptr++;     /* needn't bother with GETJSAMPLE() here */
+        outptr += num_components;
       }
     }
     input_row++;
     output_buf++;
   }
 }
 
 
 /*
  * Color conversion for grayscale: just copy the data.
  * This also works for YCbCr -> grayscale conversion, in which
  * we just copy the Y (luminance) component and ignore chrominance.
  */
 
 METHODDEF(void)
 grayscale_convert (j_decompress_ptr cinfo,
-                   JSAMPIMAGE input_buf, JDIMENSION input_row,
-                   JSAMPARRAY output_buf, int num_rows)
+                   JSAMPIMAGE input_buf, JDIMENSION input_row,
+                   JSAMPARRAY output_buf, int num_rows)
 {
   jcopy_sample_rows(input_buf[0], (int) input_row, output_buf, 0,
-                    num_rows, cinfo->output_width);
+                    num_rows, cinfo->output_width);
 }
 
 
 /*
  * Convert grayscale to RGB: just duplicate the graylevel three times.
  * This is provided to support applications that don't want to cope
  * with grayscale as a separate case.
  */
 
 METHODDEF(void)
 gray_rgb_convert (j_decompress_ptr cinfo,
-                  JSAMPIMAGE input_buf, JDIMENSION input_row,
-                  JSAMPARRAY output_buf, int num_rows)
+                  JSAMPIMAGE input_buf, JDIMENSION input_row,
+                  JSAMPARRAY output_buf, int num_rows)
 {
   register JSAMPROW inptr, outptr;
   JSAMPLE *maxinptr;
   JDIMENSION num_cols = cinfo->output_width;
   int rindex = rgb_red[cinfo->out_color_space];
   int gindex = rgb_green[cinfo->out_color_space];
   int bindex = rgb_blue[cinfo->out_color_space];
   int rgbstride = rgb_pixelsize[cinfo->out_color_space];
 
   while (--num_rows >= 0) {
@@ skipping 10 matching lines @@
 
 /*
  * Adobe-style YCCK->CMYK conversion.
  * We convert YCbCr to R=1-C, G=1-M, and B=1-Y using the same
  * conversion as above, while passing K (black) unchanged.
  * We assume build_ycc_rgb_table has been called.
  */
 
 METHODDEF(void)
 ycck_cmyk_convert (j_decompress_ptr cinfo,
-                   JSAMPIMAGE input_buf, JDIMENSION input_row,
-                   JSAMPARRAY output_buf, int num_rows)
+                   JSAMPIMAGE input_buf, JDIMENSION input_row,
+                   JSAMPARRAY output_buf, int num_rows)
 {
   my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert;
   register int y, cb, cr;
   register JSAMPROW outptr;
   register JSAMPROW inptr0, inptr1, inptr2, inptr3;
   register JDIMENSION col;
   JDIMENSION num_cols = cinfo->output_width;
   /* copy these pointers into registers if possible */
   register JSAMPLE * range_limit = cinfo->sample_range_limit;
   register int * Crrtab = cconvert->Cr_r_tab;
   register int * Cbbtab = cconvert->Cb_b_tab;
   register INT32 * Crgtab = cconvert->Cr_g_tab;
   register INT32 * Cbgtab = cconvert->Cb_g_tab;
   SHIFT_TEMPS
 
   while (--num_rows >= 0) {
     inptr0 = input_buf[0][input_row];
     inptr1 = input_buf[1][input_row];
     inptr2 = input_buf[2][input_row];
     inptr3 = input_buf[3][input_row];
     input_row++;
     outptr = *output_buf++;
     for (col = 0; col < num_cols; col++) {
       y  = GETJSAMPLE(inptr0[col]);
       cb = GETJSAMPLE(inptr1[col]);
       cr = GETJSAMPLE(inptr2[col]);
       /* Range-limiting is essential due to noise introduced by DCT losses. */
-      outptr[0] = range_limit[MAXJSAMPLE - (y + Crrtab[cr])];   /* red */
-      outptr[1] = range_limit[MAXJSAMPLE - (y +                 /* green */
-                              ((int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr],
-                                                 SCALEBITS)))];
-      outptr[2] = range_limit[MAXJSAMPLE - (y + Cbbtab[cb])];   /* blue */
+      outptr[0] = range_limit[MAXJSAMPLE - (y + Crrtab[cr])];   /* red */
+      outptr[1] = range_limit[MAXJSAMPLE - (y +                 /* green */
+                              ((int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr],
+                                                 SCALEBITS)))];
+      outptr[2] = range_limit[MAXJSAMPLE - (y + Cbbtab[cb])];   /* blue */
       /* K passes through unchanged */
-      outptr[3] = inptr3[col];  /* don't need GETJSAMPLE here */
+      outptr[3] = inptr3[col];  /* don't need GETJSAMPLE here */
       outptr += 4;
     }
   }
 }
 
 
 /*
  * Empty method for start_pass.
  */
 
 METHODDEF(void)
 start_pass_dcolor (j_decompress_ptr cinfo)
 {
   /* no work needed */
 }
 
 
 /*
  * Module initialization routine for output colorspace conversion.
  */
 
 GLOBAL(void)
 jinit_color_deconverter (j_decompress_ptr cinfo)
 {
   my_cconvert_ptr cconvert;
   int ci;
 
   cconvert = (my_cconvert_ptr)
     (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
-                                SIZEOF(my_color_deconverter));
+                                SIZEOF(my_color_deconverter));
   cinfo->cconvert = (struct jpeg_color_deconverter *) cconvert;
   cconvert->pub.start_pass = start_pass_dcolor;
 
   /* Make sure num_components agrees with jpeg_color_space */
   switch (cinfo->jpeg_color_space) {
   case JCS_GRAYSCALE:
     if (cinfo->num_components != 1)
       ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
     break;
 
   case JCS_RGB:
   case JCS_YCbCr:
     if (cinfo->num_components != 3)
       ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
     break;
 
   case JCS_CMYK:
   case JCS_YCCK:
     if (cinfo->num_components != 4)
       ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
     break;
 
-  default:                      /* JCS_UNKNOWN can be anything */
+  default:                      /* JCS_UNKNOWN can be anything */
     if (cinfo->num_components < 1)
       ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
     break;
   }
 
   /* Set out_color_components and conversion method based on requested space.
    * Also clear the component_needed flags for any unused components,
    * so that earlier pipeline stages can avoid useless computation.
    */
 
   switch (cinfo->out_color_space) {
   case JCS_GRAYSCALE:
     cinfo->out_color_components = 1;
     if (cinfo->jpeg_color_space == JCS_GRAYSCALE ||
-        cinfo->jpeg_color_space == JCS_YCbCr) {
+        cinfo->jpeg_color_space == JCS_YCbCr) {
       cconvert->pub.color_convert = grayscale_convert;
       /* For color->grayscale conversion, only the Y (0) component is needed */
       for (ci = 1; ci < cinfo->num_components; ci++)
-        cinfo->comp_info[ci].component_needed = FALSE;
+        cinfo->comp_info[ci].component_needed = FALSE;
     } else
       ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
     break;
 
   case JCS_RGB:
   case JCS_EXT_RGB:
   case JCS_EXT_RGBX:
   case JCS_EXT_BGR:
   case JCS_EXT_BGRX:
   case JCS_EXT_XBGR:
@@ skipping 24 matching lines @@
       cconvert->pub.color_convert = null_convert;
     } else
       ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
     break;
 
   default:
     /* Permit null conversion to same output space */
     if (cinfo->out_color_space == cinfo->jpeg_color_space) {
       cinfo->out_color_components = cinfo->num_components;
       cconvert->pub.color_convert = null_convert;
-    } else                      /* unsupported non-null conversion */
+    } else                      /* unsupported non-null conversion */
       ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
     break;
   }
 
   if (cinfo->quantize_colors)
     cinfo->output_components = 1; /* single colormapped output component */
   else
     cinfo->output_components = cinfo->out_color_components;
 }