jquant1.c - Issue 1953443002: Update to libjpeg_turbo 1.4.90

Unified Diff: jquant1.c

Issue 1953443002: Update to libjpeg_turbo 1.4.90 (Closed) Base URL: https://chromium.googlesource.com/chromium/deps/libjpeg_turbo.git@master

Patch Set: Created 4 years, 7 months ago

Use n/p to move between diff chunks; N/P to move between comments. Draft comments are only viewable by you.

Jump to:

View side-by-side diff with in-line comments

Download patch

Index: jquant1.c

diff --git a/jquant1.c b/jquant1.c

index aa2c59a4be82fe181f7737c0baacc13ab9632b8d..e7814815efe89733de962bde2be87ef573d1acea 100644

--- a/jquant1.c

+++ b/jquant1.c

@@ -4,8 +4,9 @@

* This file was part of the Independent JPEG Group's software:

* libjpeg-turbo Modifications:

- * For conditions of distribution and use, see the accompanying README file.

+ * For conditions of distribution and use, see the accompanying README.ijg

+ * file.

* This file contains 1-pass color quantization (color mapping) routines.

* These routines provide mapping to a fixed color map using equally spaced

@@ -70,9 +71,9 @@

* table in both directions.

-#define ODITHER_SIZE 16 /* dimension of dither matrix */

+#define ODITHER_SIZE 16 /* dimension of dither matrix */

/* NB: if ODITHER_SIZE is not a power of 2, ODITHER_MASK uses will break */

-#define ODITHER_CELLS (ODITHER_SIZE*ODITHER_SIZE) /* # cells in matrix */

+#define ODITHER_CELLS (ODITHER_SIZE*ODITHER_SIZE) /* # cells in matrix */

#define ODITHER_MASK (ODITHER_SIZE-1) /* mask for wrapping around counters */

typedef int ODITHER_MATRIX[ODITHER_SIZE][ODITHER_SIZE];

@@ -107,8 +108,8 @@ static const UINT8 base_dither_matrix[ODITHER_SIZE][ODITHER_SIZE] = {

* Errors are accumulated into the array fserrors[], at a resolution of

* 1/16th of a pixel count. The error at a given pixel is propagated

* to its not-yet-processed neighbors using the standard F-S fractions,

- * ... (here) 7/16

- * 3/16 5/16 1/16

+ * ... (here) 7/16

+ * 3/16 5/16 1/16

* We work left-to-right on even rows, right-to-left on odd rows.

* We can get away with a single array (holding one row's worth of errors)

@@ -121,52 +122,49 @@ static const UINT8 base_dither_matrix[ODITHER_SIZE][ODITHER_SIZE] = {

* The fserrors[] array is indexed [component#][position].

* We provide (#columns + 2) entries per component; the extra entry at each

* end saves us from special-casing the first and last pixels.

- *

- * Note: on a wide image, we might not have enough room in a PC's near data

- * segment to hold the error array; so it is allocated with alloc_large.

#if BITS_IN_JSAMPLE == 8

-typedef INT16 FSERROR; /* 16 bits should be enough */

-typedef int LOCFSERROR; /* use 'int' for calculation temps */

+typedef INT16 FSERROR; /* 16 bits should be enough */

+typedef int LOCFSERROR; /* use 'int' for calculation temps */

#else

-typedef INT32 FSERROR; /* may need more than 16 bits */

-typedef INT32 LOCFSERROR; /* be sure calculation temps are big enough */

+typedef JLONG FSERROR; /* may need more than 16 bits */

+typedef JLONG LOCFSERROR; /* be sure calculation temps are big enough */

#endif

-typedef FSERROR FAR *FSERRPTR; /* pointer to error array (in FAR storage!) */

+typedef FSERROR *FSERRPTR; /* pointer to error array */

/* Private subobject */

-#define MAX_Q_COMPS 4 /* max components I can handle */

+#define MAX_Q_COMPS 4 /* max components I can handle */

typedef struct {

struct jpeg_color_quantizer pub; /* public fields */

/* Initially allocated colormap is saved here */

- JSAMPARRAY sv_colormap; /* The color map as a 2-D pixel array */

- int sv_actual; /* number of entries in use */

+ JSAMPARRAY sv_colormap; /* The color map as a 2-D pixel array */

+ int sv_actual; /* number of entries in use */

- JSAMPARRAY colorindex; /* Precomputed mapping for speed */

+ JSAMPARRAY colorindex; /* Precomputed mapping for speed */

/* colorindex[i][j] = index of color closest to pixel value j in component i,

* premultiplied as described above. Since colormap indexes must fit into

* JSAMPLEs, the entries of this array will too.

- boolean is_padded; /* is the colorindex padded for odither? */

+ boolean is_padded; /* is the colorindex padded for odither? */

- int Ncolors[MAX_Q_COMPS]; /* # of values alloced to each component */

+ int Ncolors[MAX_Q_COMPS]; /* # of values alloced to each component */

/* Variables for ordered dithering */

- int row_index; /* cur row's vertical index in dither matrix */

+ int row_index; /* cur row's vertical index in dither matrix */

ODITHER_MATRIX_PTR odither[MAX_Q_COMPS]; /* one dither array per component */

/* Variables for Floyd-Steinberg dithering */

FSERRPTR fserrors[MAX_Q_COMPS]; /* accumulated errors */

- boolean on_odd_row; /* flag to remember which row we are on */

+ boolean on_odd_row; /* flag to remember which row we are on */

} my_cquantizer;

-typedef my_cquantizer * my_cquantize_ptr;

+typedef my_cquantizer *my_cquantize_ptr;

@@ -205,11 +203,11 @@ select_ncolors (j_decompress_ptr cinfo, int Ncolors[])

iroot = 1;

do {

iroot++;

- temp = iroot; /* set temp = iroot ** nc */

+ temp = iroot; /* set temp = iroot ** nc */

for (i = 1; i < nc; i++)

temp *= iroot;

} while (temp <= (long) max_colors); /* repeat till iroot exceeds root */

- iroot--; /* now iroot = floor(root) */

+ iroot--; /* now iroot = floor(root) */

/* Must have at least 2 color values per component */

if (iroot < 2)

@@ -233,10 +231,10 @@ select_ncolors (j_decompress_ptr cinfo, int Ncolors[])

j = (cinfo->out_color_space == JCS_RGB ? RGB_order[i] : i);

/* calculate new total_colors if Ncolors[j] is incremented */

temp = total_colors / Ncolors[j];

- temp *= Ncolors[j]+1; /* done in long arith to avoid oflo */

+ temp *= Ncolors[j]+1; /* done in long arith to avoid oflo */

if (temp > (long) max_colors)

- break; /* won't fit, done with this pass */

- Ncolors[j]++; /* OK, apply the increment */

+ break; /* won't fit, done with this pass */

+ Ncolors[j]++; /* OK, apply the increment */

total_colors = (int) temp;

changed = TRUE;

}

@@ -256,7 +254,7 @@ output_value (j_decompress_ptr cinfo, int ci, int j, int maxj)

* (Forcing the upper and lower values to the limits ensures that

* dithering can't produce a color outside the selected gamut.)

- return (int) (((INT32) j * MAXJSAMPLE + maxj/2) / maxj);

+ return (int) (((JLONG) j * MAXJSAMPLE + maxj/2) / maxj);

}

@@ -266,7 +264,7 @@ largest_input_value (j_decompress_ptr cinfo, int ci, int j, int maxj)

/* Must have largest(j=0) >= 0, and largest(j=maxj) >= MAXJSAMPLE */

{

/* Breakpoints are halfway between values returned by output_value */

- return (int) (((INT32) (2*j + 1) * MAXJSAMPLE + maxj) / (2*maxj));

+ return (int) (((JLONG) (2*j + 1) * MAXJSAMPLE + maxj) / (2*maxj));

}

@@ -278,8 +276,8 @@ LOCAL(void)

create_colormap (j_decompress_ptr cinfo)

{

my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize;

- JSAMPARRAY colormap; /* Created colormap */

- int total_colors; /* Number of distinct output colors */

+ JSAMPARRAY colormap; /* Created colormap */

+ int total_colors; /* Number of distinct output colors */

int i,j,k, nci, blksize, blkdist, ptr, val;

/* Select number of colors for each component */

@@ -288,8 +286,8 @@ create_colormap (j_decompress_ptr cinfo)

/* Report selected color counts */

if (cinfo->out_color_components == 3)

TRACEMS4(cinfo, 1, JTRC_QUANT_3_NCOLORS,

- total_colors, cquantize->Ncolors[0],

- cquantize->Ncolors[1], cquantize->Ncolors[2]);

+ total_colors, cquantize->Ncolors[0],

+ cquantize->Ncolors[1], cquantize->Ncolors[2]);

else

TRACEMS1(cinfo, 1, JTRC_QUANT_NCOLORS, total_colors);

@@ -314,12 +312,12 @@ create_colormap (j_decompress_ptr cinfo)

val = output_value(cinfo, i, j, nci-1);

/* Fill in all colormap entries that have this value of this component */

for (ptr = j * blksize; ptr < total_colors; ptr += blkdist) {

- /* fill in blksize entries beginning at ptr */

- for (k = 0; k < blksize; k++)

- colormap[i][ptr+k] = (JSAMPLE) val;

+ /* fill in blksize entries beginning at ptr */

+ for (k = 0; k < blksize; k++)

+ colormap[i][ptr+k] = (JSAMPLE) val;

}

- blkdist = blksize; /* blksize of this color is blkdist of next */

+ blkdist = blksize; /* blksize of this color is blkdist of next */

}

/* Save the colormap in private storage,

@@ -377,16 +375,16 @@ create_colorindex (j_decompress_ptr cinfo)

val = 0;

k = largest_input_value(cinfo, i, 0, nci-1);

for (j = 0; j <= MAXJSAMPLE; j++) {

- while (j > k) /* advance val if past boundary */

- k = largest_input_value(cinfo, i, ++val, nci-1);

+ while (j > k) /* advance val if past boundary */

+ k = largest_input_value(cinfo, i, ++val, nci-1);

/* premultiply so that no multiplication needed in main processing */

indexptr[j] = (JSAMPLE) (val * blksize);

}

/* Pad at both ends if necessary */

if (pad)

for (j = 1; j <= MAXJSAMPLE; j++) {

- indexptr[-j] = indexptr[0];

- indexptr[MAXJSAMPLE+j] = indexptr[MAXJSAMPLE];

+ indexptr[-j] = indexptr[0];

+ indexptr[MAXJSAMPLE+j] = indexptr[MAXJSAMPLE];

}

@@ -402,21 +400,21 @@ make_odither_array (j_decompress_ptr cinfo, int ncolors)

{

ODITHER_MATRIX_PTR odither;

int j,k;

- INT32 num,den;

+ JLONG num,den;

odither = (ODITHER_MATRIX_PTR)

(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,

- SIZEOF(ODITHER_MATRIX));

+ sizeof(ODITHER_MATRIX));

/* The inter-value distance for this color is MAXJSAMPLE/(ncolors-1).

* Hence the dither value for the matrix cell with fill order f

* (f=0..N-1) should be (N-1-2*f)/(2*N) * MAXJSAMPLE/(ncolors-1).

* On 16-bit-int machine, be careful to avoid overflow.

- den = 2 * ODITHER_CELLS * ((INT32) (ncolors - 1));

+ den = 2 * ODITHER_CELLS * ((JLONG) (ncolors - 1));

for (j = 0; j < ODITHER_SIZE; j++) {

for (k = 0; k < ODITHER_SIZE; k++) {

- num = ((INT32) (ODITHER_CELLS-1 - 2*((int)base_dither_matrix[j][k])))

- * MAXJSAMPLE;

+ num = ((JLONG) (ODITHER_CELLS-1 - 2*((int)base_dither_matrix[j][k])))

+ * MAXJSAMPLE;

/* Ensure round towards zero despite C's lack of consistency

* about rounding negative values in integer division...

@@ -429,7 +427,7 @@ make_odither_array (j_decompress_ptr cinfo, int ncolors)

* Create the ordered-dither tables.

- * Components having the same number of representative colors may

+ * Components having the same number of representative colors may

* share a dither table.

@@ -442,14 +440,14 @@ create_odither_tables (j_decompress_ptr cinfo)

for (i = 0; i < cinfo->out_color_components; i++) {

nci = cquantize->Ncolors[i]; /* # of distinct values for this color */

- odither = NULL; /* search for matching prior component */

+ odither = NULL; /* search for matching prior component */

for (j = 0; j < i; j++) {

if (nci == cquantize->Ncolors[j]) {

- odither = cquantize->odither[j];

- break;

+ odither = cquantize->odither[j];

+ break;

}

- if (odither == NULL) /* need a new table? */

+ if (odither == NULL) /* need a new table? */

odither = make_odither_array(cinfo, nci);

cquantize->odither[i] = odither;

}

@@ -462,7 +460,7 @@ create_odither_tables (j_decompress_ptr cinfo)

METHODDEF(void)

color_quantize (j_decompress_ptr cinfo, JSAMPARRAY input_buf,

- JSAMPARRAY output_buf, int num_rows)

+ JSAMPARRAY output_buf, int num_rows)

/* General case, no dithering */

{

my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize;

@@ -480,7 +478,7 @@ color_quantize (j_decompress_ptr cinfo, JSAMPARRAY input_buf,

for (col = width; col > 0; col--) {

pixcode = 0;

for (ci = 0; ci < nc; ci++) {

- pixcode += GETJSAMPLE(colorindex[ci][GETJSAMPLE(*ptrin++)]);

+ pixcode += GETJSAMPLE(colorindex[ci][GETJSAMPLE(*ptrin++)]);

}

*ptrout++ = (JSAMPLE) pixcode;

}

@@ -490,7 +488,7 @@ color_quantize (j_decompress_ptr cinfo, JSAMPARRAY input_buf,

METHODDEF(void)

color_quantize3 (j_decompress_ptr cinfo, JSAMPARRAY input_buf,

- JSAMPARRAY output_buf, int num_rows)

+ JSAMPARRAY output_buf, int num_rows)

/* Fast path for out_color_components==3, no dithering */

{

my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize;

@@ -518,15 +516,15 @@ color_quantize3 (j_decompress_ptr cinfo, JSAMPARRAY input_buf,

METHODDEF(void)

quantize_ord_dither (j_decompress_ptr cinfo, JSAMPARRAY input_buf,

- JSAMPARRAY output_buf, int num_rows)

+ JSAMPARRAY output_buf, int num_rows)

/* General case, with ordered dithering */

{

my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize;

JSAMPROW colorindex_ci;

- int * dither; /* points to active row of dither matrix */

- int row_index, col_index; /* current indexes into dither matrix */

+ int *dither; /* points to active row of dither matrix */

+ int row_index, col_index; /* current indexes into dither matrix */

int nc = cinfo->out_color_components;

int ci;

int row;

@@ -535,8 +533,7 @@ quantize_ord_dither (j_decompress_ptr cinfo, JSAMPARRAY input_buf,

for (row = 0; row < num_rows; row++) {

/* Initialize output values to 0 so can process components separately */

- jzero_far((void FAR *) output_buf[row],

- (size_t) (width * SIZEOF(JSAMPLE)));

+ jzero_far((void *) output_buf[row], (size_t) (width * sizeof(JSAMPLE)));

row_index = cquantize->row_index;

for (ci = 0; ci < nc; ci++) {

input_ptr = input_buf[row] + ci;

@@ -546,17 +543,17 @@ quantize_ord_dither (j_decompress_ptr cinfo, JSAMPARRAY input_buf,

col_index = 0;

for (col = width; col > 0; col--) {

- /* Form pixel value + dither, range-limit to 0..MAXJSAMPLE,

- * select output value, accumulate into output code for this pixel.

- * Range-limiting need not be done explicitly, as we have extended

- * the colorindex table to produce the right answers for out-of-range

- * inputs. The maximum dither is +- MAXJSAMPLE; this sets the

- * required amount of padding.

- */

- *output_ptr += colorindex_ci[GETJSAMPLE(*input_ptr)+dither[col_index]];

- input_ptr += nc;

- output_ptr++;

- col_index = (col_index + 1) & ODITHER_MASK;

+ /* Form pixel value + dither, range-limit to 0..MAXJSAMPLE,

+ * select output value, accumulate into output code for this pixel.

+ * Range-limiting need not be done explicitly, as we have extended

+ * the colorindex table to produce the right answers for out-of-range

+ * inputs. The maximum dither is +- MAXJSAMPLE; this sets the

+ * required amount of padding.

+ */

+ *output_ptr += colorindex_ci[GETJSAMPLE(*input_ptr)+dither[col_index]];

+ input_ptr += nc;

+ output_ptr++;

+ col_index = (col_index + 1) & ODITHER_MASK;

}

/* Advance row index for next row */

@@ -568,7 +565,7 @@ quantize_ord_dither (j_decompress_ptr cinfo, JSAMPARRAY input_buf,

METHODDEF(void)

quantize3_ord_dither (j_decompress_ptr cinfo, JSAMPARRAY input_buf,

- JSAMPARRAY output_buf, int num_rows)

+ JSAMPARRAY output_buf, int num_rows)

/* Fast path for out_color_components==3, with ordered dithering */

{

my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize;

@@ -578,10 +575,10 @@ quantize3_ord_dither (j_decompress_ptr cinfo, JSAMPARRAY input_buf,

JSAMPROW colorindex0 = cquantize->colorindex[0];

JSAMPROW colorindex1 = cquantize->colorindex[1];

JSAMPROW colorindex2 = cquantize->colorindex[2];

- int * dither0; /* points to active row of dither matrix */

- int * dither1;

- int * dither2;

- int row_index, col_index; /* current indexes into dither matrix */

+ int *dither0; /* points to active row of dither matrix */

+ int *dither1;

+ int *dither2;

+ int row_index, col_index; /* current indexes into dither matrix */

int row;

JDIMENSION col;

JDIMENSION width = cinfo->output_width;

@@ -597,11 +594,11 @@ quantize3_ord_dither (j_decompress_ptr cinfo, JSAMPARRAY input_buf,

for (col = width; col > 0; col--) {

pixcode = GETJSAMPLE(colorindex0[GETJSAMPLE(*input_ptr++) +

- dither0[col_index]]);

+ dither0[col_index]]);

pixcode += GETJSAMPLE(colorindex1[GETJSAMPLE(*input_ptr++) +

- dither1[col_index]]);

+ dither1[col_index]]);

pixcode += GETJSAMPLE(colorindex2[GETJSAMPLE(*input_ptr++) +

- dither2[col_index]]);

+ dither2[col_index]]);

*output_ptr++ = (JSAMPLE) pixcode;

col_index = (col_index + 1) & ODITHER_MASK;

}

@@ -613,24 +610,24 @@ quantize3_ord_dither (j_decompress_ptr cinfo, JSAMPARRAY input_buf,

METHODDEF(void)

quantize_fs_dither (j_decompress_ptr cinfo, JSAMPARRAY input_buf,

- JSAMPARRAY output_buf, int num_rows)

+ JSAMPARRAY output_buf, int num_rows)

/* General case, with Floyd-Steinberg dithering */

{

my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize;

- register LOCFSERROR cur; /* current error or pixel value */

- LOCFSERROR belowerr; /* error for pixel below cur */

- LOCFSERROR bpreverr; /* error for below/prev col */

- LOCFSERROR bnexterr; /* error for below/next col */

+ register LOCFSERROR cur; /* current error or pixel value */

+ LOCFSERROR belowerr; /* error for pixel below cur */

+ LOCFSERROR bpreverr; /* error for below/prev col */

+ LOCFSERROR bnexterr; /* error for below/next col */

LOCFSERROR delta;

- register FSERRPTR errorptr; /* => fserrors[] at column before current */

+ register FSERRPTR errorptr; /* => fserrors[] at column before current */

JSAMPROW colorindex_ci;

JSAMPROW colormap_ci;

int pixcode;

int nc = cinfo->out_color_components;

- int dir; /* 1 for left-to-right, -1 for right-to-left */

- int dirnc; /* dir * nc */

+ int dir; /* 1 for left-to-right, -1 for right-to-left */

+ int dirnc; /* dir * nc */

int ci;

int row;

JDIMENSION col;

@@ -640,23 +637,22 @@ quantize_fs_dither (j_decompress_ptr cinfo, JSAMPARRAY input_buf,

for (row = 0; row < num_rows; row++) {

/* Initialize output values to 0 so can process components separately */

- jzero_far((void FAR *) output_buf[row],

- (size_t) (width * SIZEOF(JSAMPLE)));

+ jzero_far((void *) output_buf[row], (size_t) (width * sizeof(JSAMPLE)));

for (ci = 0; ci < nc; ci++) {

input_ptr = input_buf[row] + ci;

output_ptr = output_buf[row];

if (cquantize->on_odd_row) {

- /* work right to left in this row */

- input_ptr += (width-1) * nc; /* so point to rightmost pixel */

- output_ptr += width-1;

- dir = -1;

- dirnc = -nc;

- errorptr = cquantize->fserrors[ci] + (width+1); /* => entry after last column */

+ /* work right to left in this row */

+ input_ptr += (width-1) * nc; /* so point to rightmost pixel */

+ output_ptr += width-1;

+ dir = -1;

+ dirnc = -nc;

+ errorptr = cquantize->fserrors[ci] + (width+1); /* => entry after last column */

} else {

- /* work left to right in this row */

- dir = 1;

- dirnc = nc;

- errorptr = cquantize->fserrors[ci]; /* => entry before first column */

+ /* work left to right in this row */

+ dir = 1;

+ dirnc = nc;

+ errorptr = cquantize->fserrors[ci]; /* => entry before first column */

}

colorindex_ci = cquantize->colorindex[ci];

colormap_ci = cquantize->sv_colormap[ci];

@@ -666,47 +662,47 @@ quantize_fs_dither (j_decompress_ptr cinfo, JSAMPARRAY input_buf,

belowerr = bpreverr = 0;

for (col = width; col > 0; col--) {

- /* cur holds the error propagated from the previous pixel on the

- * current line. Add the error propagated from the previous line

- * to form the complete error correction term for this pixel, and

- * round the error term (which is expressed * 16) to an integer.

- * RIGHT_SHIFT rounds towards minus infinity, so adding 8 is correct

- * for either sign of the error value.

- * Note: errorptr points to *previous* column's array entry.

- */

- cur = RIGHT_SHIFT(cur + errorptr[dir] + 8, 4);

- /* Form pixel value + error, and range-limit to 0..MAXJSAMPLE.

- * The maximum error is +- MAXJSAMPLE; this sets the required size

- * of the range_limit array.

- */

- cur += GETJSAMPLE(*input_ptr);

- cur = GETJSAMPLE(range_limit[cur]);

- /* Select output value, accumulate into output code for this pixel */

- pixcode = GETJSAMPLE(colorindex_ci[cur]);

- *output_ptr += (JSAMPLE) pixcode;

- /* Compute actual representation error at this pixel */

- /* Note: we can do this even though we don't have the final */

- /* pixel code, because the colormap is orthogonal. */

- cur -= GETJSAMPLE(colormap_ci[pixcode]);

- /* Compute error fractions to be propagated to adjacent pixels.

- * Add these into the running sums, and simultaneously shift the

- * next-line error sums left by 1 column.

- */

- bnexterr = cur;

- delta = cur * 2;

- cur += delta; /* form error * 3 */

- errorptr[0] = (FSERROR) (bpreverr + cur);

- cur += delta; /* form error * 5 */

- bpreverr = belowerr + cur;

- belowerr = bnexterr;

- cur += delta; /* form error * 7 */

- /* At this point cur contains the 7/16 error value to be propagated

- * to the next pixel on the current line, and all the errors for the

- * next line have been shifted over. We are therefore ready to move on.

- */

- input_ptr += dirnc; /* advance input ptr to next column */

- output_ptr += dir; /* advance output ptr to next column */

- errorptr += dir; /* advance errorptr to current column */

+ /* cur holds the error propagated from the previous pixel on the

+ * current line. Add the error propagated from the previous line

+ * to form the complete error correction term for this pixel, and

+ * round the error term (which is expressed * 16) to an integer.

+ * RIGHT_SHIFT rounds towards minus infinity, so adding 8 is correct

+ * for either sign of the error value.

+ * Note: errorptr points to *previous* column's array entry.

+ */

+ cur = RIGHT_SHIFT(cur + errorptr[dir] + 8, 4);

+ /* Form pixel value + error, and range-limit to 0..MAXJSAMPLE.

+ * The maximum error is +- MAXJSAMPLE; this sets the required size

+ * of the range_limit array.

+ */

+ cur += GETJSAMPLE(*input_ptr);

+ cur = GETJSAMPLE(range_limit[cur]);

+ /* Select output value, accumulate into output code for this pixel */

+ pixcode = GETJSAMPLE(colorindex_ci[cur]);

+ *output_ptr += (JSAMPLE) pixcode;

+ /* Compute actual representation error at this pixel */

+ /* Note: we can do this even though we don't have the final */

+ /* pixel code, because the colormap is orthogonal. */

+ cur -= GETJSAMPLE(colormap_ci[pixcode]);

+ /* Compute error fractions to be propagated to adjacent pixels.

+ * Add these into the running sums, and simultaneously shift the

+ * next-line error sums left by 1 column.

+ */

+ bnexterr = cur;

+ delta = cur * 2;

+ cur += delta; /* form error * 3 */

+ errorptr[0] = (FSERROR) (bpreverr + cur);

+ cur += delta; /* form error * 5 */

+ bpreverr = belowerr + cur;

+ belowerr = bnexterr;

+ cur += delta; /* form error * 7 */

+ /* At this point cur contains the 7/16 error value to be propagated

+ * to the next pixel on the current line, and all the errors for the

+ * next line have been shifted over. We are therefore ready to move on.

+ */

+ input_ptr += dirnc; /* advance input ptr to next column */

+ output_ptr += dir; /* advance output ptr to next column */

+ errorptr += dir; /* advance errorptr to current column */

}

/* Post-loop cleanup: we must unload the final error value into the

* final fserrors[] entry. Note we need not unload belowerr because

@@ -730,7 +726,7 @@ alloc_fs_workspace (j_decompress_ptr cinfo)

size_t arraysize;

int i;

- arraysize = (size_t) ((cinfo->output_width + 2) * SIZEOF(FSERROR));

+ arraysize = (size_t) ((cinfo->output_width + 2) * sizeof(FSERROR));

for (i = 0; i < cinfo->out_color_components; i++) {

cquantize->fserrors[i] = (FSERRPTR)

(*cinfo->mem->alloc_large)((j_common_ptr) cinfo, JPOOL_IMAGE, arraysize);

@@ -766,7 +762,7 @@ start_pass_1_quant (j_decompress_ptr cinfo, boolean is_pre_scan)

cquantize->pub.color_quantize = quantize3_ord_dither;

else

cquantize->pub.color_quantize = quantize_ord_dither;

- cquantize->row_index = 0; /* initialize state for ordered dither */

+ cquantize->row_index = 0; /* initialize state for ordered dither */

/* If user changed to ordered dither from another mode,

* we must recreate the color index table with padding.

* This will cost extra space, but probably isn't very likely.

@@ -784,9 +780,9 @@ start_pass_1_quant (j_decompress_ptr cinfo, boolean is_pre_scan)

if (cquantize->fserrors[0] == NULL)

alloc_fs_workspace(cinfo);

/* Initialize the propagated errors to zero. */

- arraysize = (size_t) ((cinfo->output_width + 2) * SIZEOF(FSERROR));

+ arraysize = (size_t) ((cinfo->output_width + 2) * sizeof(FSERROR));

for (i = 0; i < cinfo->out_color_components; i++)

- jzero_far((void FAR *) cquantize->fserrors[i], arraysize);

+ jzero_far((void *) cquantize->fserrors[i], arraysize);

break;

default:

ERREXIT(cinfo, JERR_NOT_COMPILED);

@@ -829,13 +825,13 @@ jinit_1pass_quantizer (j_decompress_ptr cinfo)

cquantize = (my_cquantize_ptr)

(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,

- SIZEOF(my_cquantizer));

+ sizeof(my_cquantizer));

cinfo->cquantize = (struct jpeg_color_quantizer *) cquantize;

cquantize->pub.start_pass = start_pass_1_quant;

cquantize->pub.finish_pass = finish_pass_1_quant;

cquantize->pub.new_color_map = new_color_map_1_quant;

cquantize->fserrors[0] = NULL; /* Flag FS workspace not allocated */

- cquantize->odither[0] = NULL; /* Also flag odither arrays not allocated */

+ cquantize->odither[0] = NULL; /* Also flag odither arrays not allocated */

/* Make sure my internal arrays won't overflow */

if (cinfo->out_color_components > MAX_Q_COMPS)

@@ -849,10 +845,10 @@ jinit_1pass_quantizer (j_decompress_ptr cinfo)

create_colorindex(cinfo);

/* Allocate Floyd-Steinberg workspace now if requested.

- * We do this now since it is FAR storage and may affect the memory

- * manager's space calculations. If the user changes to FS dither

- * mode in a later pass, we will allocate the space then, and will

- * possibly overrun the max_memory_to_use setting.

+ * We do this now since it may affect the memory manager's space

+ * calculations. If the user changes to FS dither mode in a later pass, we

+ * will allocate the space then, and will possibly overrun the

+ * max_memory_to_use setting.

if (cinfo->dither_mode == JDITHER_FS)

alloc_fs_workspace(cinfo);

« no previous file with comments | « jpgtest.cxx ('k') | jquant2.c » ('j') | no next file with comments »