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-rw-r--r--media/libjpeg/jdcolor.c882
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diff --git a/media/libjpeg/jdcolor.c b/media/libjpeg/jdcolor.c
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+/*
+ * jdcolor.c
+ *
+ * This file was part of the Independent JPEG Group's software:
+ * Copyright (C) 1991-1997, Thomas G. Lane.
+ * Modified 2011 by Guido Vollbeding.
+ * libjpeg-turbo Modifications:
+ * Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
+ * Copyright (C) 2009, 2011-2012, 2014-2015, D. R. Commander.
+ * Copyright (C) 2013, Linaro Limited.
+ * For conditions of distribution and use, see the accompanying README.ijg
+ * file.
+ *
+ * This file contains output colorspace conversion routines.
+ */
+
+#define JPEG_INTERNALS
+#include "jinclude.h"
+#include "jpeglib.h"
+#include "jsimd.h"
+#include "jconfigint.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 */
+ JLONG *Cr_g_tab; /* => table for Cr to G conversion */
+ JLONG *Cb_g_tab; /* => table for Cb to G conversion */
+
+ /* Private state for RGB->Y conversion */
+ JLONG *rgb_y_tab; /* => table for RGB to Y conversion */
+} my_color_deconverter;
+
+typedef my_color_deconverter *my_cconvert_ptr;
+
+
+/**************** YCbCr -> RGB conversion: most common case **************/
+/**************** RGB -> Y conversion: less 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
+ *
+ * Y = 0.29900 * R + 0.58700 * G + 0.11400 * B
+ *
+ * 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 ((JLONG)1 << (SCALEBITS - 1))
+#define FIX(x) ((JLONG)((x) * (1L << SCALEBITS) + 0.5))
+
+/* We allocate one big table for RGB->Y conversion and divide it up into
+ * three parts, instead of doing three alloc_small requests. This lets us
+ * use a single table base address, which can be held in a register in the
+ * inner loops on many machines (more than can hold all three addresses,
+ * anyway).
+ */
+
+#define R_Y_OFF 0 /* offset to R => Y section */
+#define G_Y_OFF (1 * (MAXJSAMPLE + 1)) /* offset to G => Y section */
+#define B_Y_OFF (2 * (MAXJSAMPLE + 1)) /* etc. */
+#define TABLE_SIZE (3 * (MAXJSAMPLE + 1))
+
+
+/* Include inline routines for colorspace extensions */
+
+#include "jdcolext.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 ycc_rgb_convert_internal ycc_extrgb_convert_internal
+#define gray_rgb_convert_internal gray_extrgb_convert_internal
+#define rgb_rgb_convert_internal rgb_extrgb_convert_internal
+#include "jdcolext.c"
+#undef RGB_RED
+#undef RGB_GREEN
+#undef RGB_BLUE
+#undef RGB_PIXELSIZE
+#undef ycc_rgb_convert_internal
+#undef gray_rgb_convert_internal
+#undef rgb_rgb_convert_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 ycc_rgb_convert_internal ycc_extrgbx_convert_internal
+#define gray_rgb_convert_internal gray_extrgbx_convert_internal
+#define rgb_rgb_convert_internal rgb_extrgbx_convert_internal
+#include "jdcolext.c"
+#undef RGB_RED
+#undef RGB_GREEN
+#undef RGB_BLUE
+#undef RGB_ALPHA
+#undef RGB_PIXELSIZE
+#undef ycc_rgb_convert_internal
+#undef gray_rgb_convert_internal
+#undef rgb_rgb_convert_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 ycc_rgb_convert_internal ycc_extbgr_convert_internal
+#define gray_rgb_convert_internal gray_extbgr_convert_internal
+#define rgb_rgb_convert_internal rgb_extbgr_convert_internal
+#include "jdcolext.c"
+#undef RGB_RED
+#undef RGB_GREEN
+#undef RGB_BLUE
+#undef RGB_PIXELSIZE
+#undef ycc_rgb_convert_internal
+#undef gray_rgb_convert_internal
+#undef rgb_rgb_convert_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 ycc_rgb_convert_internal ycc_extbgrx_convert_internal
+#define gray_rgb_convert_internal gray_extbgrx_convert_internal
+#define rgb_rgb_convert_internal rgb_extbgrx_convert_internal
+#include "jdcolext.c"
+#undef RGB_RED
+#undef RGB_GREEN
+#undef RGB_BLUE
+#undef RGB_ALPHA
+#undef RGB_PIXELSIZE
+#undef ycc_rgb_convert_internal
+#undef gray_rgb_convert_internal
+#undef rgb_rgb_convert_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 ycc_rgb_convert_internal ycc_extxbgr_convert_internal
+#define gray_rgb_convert_internal gray_extxbgr_convert_internal
+#define rgb_rgb_convert_internal rgb_extxbgr_convert_internal
+#include "jdcolext.c"
+#undef RGB_RED
+#undef RGB_GREEN
+#undef RGB_BLUE
+#undef RGB_ALPHA
+#undef RGB_PIXELSIZE
+#undef ycc_rgb_convert_internal
+#undef gray_rgb_convert_internal
+#undef rgb_rgb_convert_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 ycc_rgb_convert_internal ycc_extxrgb_convert_internal
+#define gray_rgb_convert_internal gray_extxrgb_convert_internal
+#define rgb_rgb_convert_internal rgb_extxrgb_convert_internal
+#include "jdcolext.c"
+#undef RGB_RED
+#undef RGB_GREEN
+#undef RGB_BLUE
+#undef RGB_ALPHA
+#undef RGB_PIXELSIZE
+#undef ycc_rgb_convert_internal
+#undef gray_rgb_convert_internal
+#undef rgb_rgb_convert_internal
+
+
+/*
+ * 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;
+ JLONG x;
+ SHIFT_TEMPS
+
+ cconvert->Cr_r_tab = (int *)
+ (*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_IMAGE,
+ (MAXJSAMPLE + 1) * sizeof(int));
+ cconvert->Cb_b_tab = (int *)
+ (*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_IMAGE,
+ (MAXJSAMPLE + 1) * sizeof(int));
+ cconvert->Cr_g_tab = (JLONG *)
+ (*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_IMAGE,
+ (MAXJSAMPLE + 1) * sizeof(JLONG));
+ cconvert->Cb_g_tab = (JLONG *)
+ (*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_IMAGE,
+ (MAXJSAMPLE + 1) * sizeof(JLONG));
+
+ 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);
+ /* 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);
+ /* 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.
+ */
+
+METHODDEF(void)
+ycc_rgb_convert(j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
+ JDIMENSION input_row, JSAMPARRAY output_buf, int num_rows)
+{
+ switch (cinfo->out_color_space) {
+ case JCS_EXT_RGB:
+ ycc_extrgb_convert_internal(cinfo, input_buf, input_row, output_buf,
+ num_rows);
+ break;
+ case JCS_EXT_RGBX:
+ case JCS_EXT_RGBA:
+ ycc_extrgbx_convert_internal(cinfo, input_buf, input_row, output_buf,
+ num_rows);
+ break;
+ case JCS_EXT_BGR:
+ ycc_extbgr_convert_internal(cinfo, input_buf, input_row, output_buf,
+ num_rows);
+ break;
+ case JCS_EXT_BGRX:
+ case JCS_EXT_BGRA:
+ ycc_extbgrx_convert_internal(cinfo, input_buf, input_row, output_buf,
+ num_rows);
+ break;
+ case JCS_EXT_XBGR:
+ case JCS_EXT_ABGR:
+ ycc_extxbgr_convert_internal(cinfo, input_buf, input_row, output_buf,
+ num_rows);
+ break;
+ case JCS_EXT_XRGB:
+ case JCS_EXT_ARGB:
+ ycc_extxrgb_convert_internal(cinfo, input_buf, input_row, output_buf,
+ num_rows);
+ break;
+ default:
+ ycc_rgb_convert_internal(cinfo, input_buf, input_row, output_buf,
+ num_rows);
+ break;
+ }
+}
+
+
+/**************** Cases other than YCbCr -> RGB **************/
+
+
+/*
+ * Initialize for RGB->grayscale colorspace conversion.
+ */
+
+LOCAL(void)
+build_rgb_y_table(j_decompress_ptr cinfo)
+{
+ my_cconvert_ptr cconvert = (my_cconvert_ptr)cinfo->cconvert;
+ JLONG *rgb_y_tab;
+ JLONG i;
+
+ /* Allocate and fill in the conversion tables. */
+ cconvert->rgb_y_tab = rgb_y_tab = (JLONG *)
+ (*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_IMAGE,
+ (TABLE_SIZE * sizeof(JLONG)));
+
+ for (i = 0; i <= MAXJSAMPLE; i++) {
+ rgb_y_tab[i + R_Y_OFF] = FIX(0.29900) * i;
+ rgb_y_tab[i + G_Y_OFF] = FIX(0.58700) * i;
+ rgb_y_tab[i + B_Y_OFF] = FIX(0.11400) * i + ONE_HALF;
+ }
+}
+
+
+/*
+ * Convert RGB to grayscale.
+ */
+
+METHODDEF(void)
+rgb_gray_convert(j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
+ JDIMENSION input_row, JSAMPARRAY output_buf, int num_rows)
+{
+ my_cconvert_ptr cconvert = (my_cconvert_ptr)cinfo->cconvert;
+ register int r, g, b;
+ register JLONG *ctab = cconvert->rgb_y_tab;
+ register JSAMPROW outptr;
+ register JSAMPROW inptr0, inptr1, inptr2;
+ register JDIMENSION col;
+ JDIMENSION num_cols = cinfo->output_width;
+
+ 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++) {
+ r = inptr0[col];
+ g = inptr1[col];
+ b = inptr2[col];
+ /* Y */
+ outptr[col] = (JSAMPLE)((ctab[r + R_Y_OFF] + ctab[g + G_Y_OFF] +
+ ctab[b + B_Y_OFF]) >> SCALEBITS);
+ }
+ }
+}
+
+
+/*
+ * 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)
+{
+ register JSAMPROW inptr, inptr0, inptr1, inptr2, inptr3, outptr;
+ register JDIMENSION col;
+ register int num_components = cinfo->num_components;
+ JDIMENSION num_cols = cinfo->output_width;
+ int ci;
+
+ if (num_components == 3) {
+ 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++) {
+ *outptr++ = inptr0[col];
+ *outptr++ = inptr1[col];
+ *outptr++ = inptr2[col];
+ }
+ }
+ } else if (num_components == 4) {
+ 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++) {
+ *outptr++ = inptr0[col];
+ *outptr++ = inptr1[col];
+ *outptr++ = inptr2[col];
+ *outptr++ = inptr3[col];
+ }
+ }
+ } else {
+ while (--num_rows >= 0) {
+ for (ci = 0; ci < num_components; ci++) {
+ inptr = input_buf[ci][input_row];
+ outptr = *output_buf;
+ for (col = 0; col < num_cols; col++) {
+ outptr[ci] = inptr[col];
+ outptr += num_components;
+ }
+ }
+ output_buf++;
+ input_row++;
+ }
+ }
+}
+
+
+/*
+ * 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)
+{
+ jcopy_sample_rows(input_buf[0], (int)input_row, output_buf, 0, num_rows,
+ cinfo->output_width);
+}
+
+
+/*
+ * Convert grayscale to RGB
+ */
+
+METHODDEF(void)
+gray_rgb_convert(j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
+ JDIMENSION input_row, JSAMPARRAY output_buf, int num_rows)
+{
+ switch (cinfo->out_color_space) {
+ case JCS_EXT_RGB:
+ gray_extrgb_convert_internal(cinfo, input_buf, input_row, output_buf,
+ num_rows);
+ break;
+ case JCS_EXT_RGBX:
+ case JCS_EXT_RGBA:
+ gray_extrgbx_convert_internal(cinfo, input_buf, input_row, output_buf,
+ num_rows);
+ break;
+ case JCS_EXT_BGR:
+ gray_extbgr_convert_internal(cinfo, input_buf, input_row, output_buf,
+ num_rows);
+ break;
+ case JCS_EXT_BGRX:
+ case JCS_EXT_BGRA:
+ gray_extbgrx_convert_internal(cinfo, input_buf, input_row, output_buf,
+ num_rows);
+ break;
+ case JCS_EXT_XBGR:
+ case JCS_EXT_ABGR:
+ gray_extxbgr_convert_internal(cinfo, input_buf, input_row, output_buf,
+ num_rows);
+ break;
+ case JCS_EXT_XRGB:
+ case JCS_EXT_ARGB:
+ gray_extxrgb_convert_internal(cinfo, input_buf, input_row, output_buf,
+ num_rows);
+ break;
+ default:
+ gray_rgb_convert_internal(cinfo, input_buf, input_row, output_buf,
+ num_rows);
+ break;
+ }
+}
+
+
+/*
+ * Convert plain RGB to extended RGB
+ */
+
+METHODDEF(void)
+rgb_rgb_convert(j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
+ JDIMENSION input_row, JSAMPARRAY output_buf, int num_rows)
+{
+ switch (cinfo->out_color_space) {
+ case JCS_EXT_RGB:
+ rgb_extrgb_convert_internal(cinfo, input_buf, input_row, output_buf,
+ num_rows);
+ break;
+ case JCS_EXT_RGBX:
+ case JCS_EXT_RGBA:
+ rgb_extrgbx_convert_internal(cinfo, input_buf, input_row, output_buf,
+ num_rows);
+ break;
+ case JCS_EXT_BGR:
+ rgb_extbgr_convert_internal(cinfo, input_buf, input_row, output_buf,
+ num_rows);
+ break;
+ case JCS_EXT_BGRX:
+ case JCS_EXT_BGRA:
+ rgb_extbgrx_convert_internal(cinfo, input_buf, input_row, output_buf,
+ num_rows);
+ break;
+ case JCS_EXT_XBGR:
+ case JCS_EXT_ABGR:
+ rgb_extxbgr_convert_internal(cinfo, input_buf, input_row, output_buf,
+ num_rows);
+ break;
+ case JCS_EXT_XRGB:
+ case JCS_EXT_ARGB:
+ rgb_extxrgb_convert_internal(cinfo, input_buf, input_row, output_buf,
+ num_rows);
+ break;
+ default:
+ rgb_rgb_convert_internal(cinfo, input_buf, input_row, output_buf,
+ num_rows);
+ break;
+ }
+}
+
+
+/*
+ * 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)
+{
+ 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 JLONG *Crgtab = cconvert->Cr_g_tab;
+ register JLONG *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 = inptr0[col];
+ cb = inptr1[col];
+ cr = 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 */
+ /* K passes through unchanged */
+ outptr[3] = inptr3[col];
+ outptr += 4;
+ }
+ }
+}
+
+
+/*
+ * RGB565 conversion
+ */
+
+#define PACK_SHORT_565_LE(r, g, b) \
+ ((((r) << 8) & 0xF800) | (((g) << 3) & 0x7E0) | ((b) >> 3))
+#define PACK_SHORT_565_BE(r, g, b) \
+ (((r) & 0xF8) | ((g) >> 5) | (((g) << 11) & 0xE000) | (((b) << 5) & 0x1F00))
+
+#define PACK_TWO_PIXELS_LE(l, r) ((r << 16) | l)
+#define PACK_TWO_PIXELS_BE(l, r) ((l << 16) | r)
+
+#define PACK_NEED_ALIGNMENT(ptr) (((size_t)(ptr)) & 3)
+
+#define WRITE_TWO_ALIGNED_PIXELS(addr, pixels) ((*(int *)(addr)) = pixels)
+
+#define DITHER_565_R(r, dither) ((r) + ((dither) & 0xFF))
+#define DITHER_565_G(g, dither) ((g) + (((dither) & 0xFF) >> 1))
+#define DITHER_565_B(b, dither) ((b) + ((dither) & 0xFF))
+
+
+/* Declarations for ordered dithering
+ *
+ * We use a 4x4 ordered dither array packed into 32 bits. This array is
+ * sufficient for dithering RGB888 to RGB565.
+ */
+
+#define DITHER_MASK 0x3
+#define DITHER_ROTATE(x) ((((x) & 0xFF) << 24) | (((x) >> 8) & 0x00FFFFFF))
+static const JLONG dither_matrix[4] = {
+ 0x0008020A,
+ 0x0C040E06,
+ 0x030B0109,
+ 0x0F070D05
+};
+
+
+static INLINE boolean is_big_endian(void)
+{
+ int test_value = 1;
+ if (*(char *)&test_value != 1)
+ return TRUE;
+ return FALSE;
+}
+
+
+/* Include inline routines for RGB565 conversion */
+
+#define PACK_SHORT_565 PACK_SHORT_565_LE
+#define PACK_TWO_PIXELS PACK_TWO_PIXELS_LE
+#define ycc_rgb565_convert_internal ycc_rgb565_convert_le
+#define ycc_rgb565D_convert_internal ycc_rgb565D_convert_le
+#define rgb_rgb565_convert_internal rgb_rgb565_convert_le
+#define rgb_rgb565D_convert_internal rgb_rgb565D_convert_le
+#define gray_rgb565_convert_internal gray_rgb565_convert_le
+#define gray_rgb565D_convert_internal gray_rgb565D_convert_le
+#include "jdcol565.c"
+#undef PACK_SHORT_565
+#undef PACK_TWO_PIXELS
+#undef ycc_rgb565_convert_internal
+#undef ycc_rgb565D_convert_internal
+#undef rgb_rgb565_convert_internal
+#undef rgb_rgb565D_convert_internal
+#undef gray_rgb565_convert_internal
+#undef gray_rgb565D_convert_internal
+
+#define PACK_SHORT_565 PACK_SHORT_565_BE
+#define PACK_TWO_PIXELS PACK_TWO_PIXELS_BE
+#define ycc_rgb565_convert_internal ycc_rgb565_convert_be
+#define ycc_rgb565D_convert_internal ycc_rgb565D_convert_be
+#define rgb_rgb565_convert_internal rgb_rgb565_convert_be
+#define rgb_rgb565D_convert_internal rgb_rgb565D_convert_be
+#define gray_rgb565_convert_internal gray_rgb565_convert_be
+#define gray_rgb565D_convert_internal gray_rgb565D_convert_be
+#include "jdcol565.c"
+#undef PACK_SHORT_565
+#undef PACK_TWO_PIXELS
+#undef ycc_rgb565_convert_internal
+#undef ycc_rgb565D_convert_internal
+#undef rgb_rgb565_convert_internal
+#undef rgb_rgb565D_convert_internal
+#undef gray_rgb565_convert_internal
+#undef gray_rgb565D_convert_internal
+
+
+METHODDEF(void)
+ycc_rgb565_convert(j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
+ JDIMENSION input_row, JSAMPARRAY output_buf, int num_rows)
+{
+ if (is_big_endian())
+ ycc_rgb565_convert_be(cinfo, input_buf, input_row, output_buf, num_rows);
+ else
+ ycc_rgb565_convert_le(cinfo, input_buf, input_row, output_buf, num_rows);
+}
+
+
+METHODDEF(void)
+ycc_rgb565D_convert(j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
+ JDIMENSION input_row, JSAMPARRAY output_buf, int num_rows)
+{
+ if (is_big_endian())
+ ycc_rgb565D_convert_be(cinfo, input_buf, input_row, output_buf, num_rows);
+ else
+ ycc_rgb565D_convert_le(cinfo, input_buf, input_row, output_buf, num_rows);
+}
+
+
+METHODDEF(void)
+rgb_rgb565_convert(j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
+ JDIMENSION input_row, JSAMPARRAY output_buf, int num_rows)
+{
+ if (is_big_endian())
+ rgb_rgb565_convert_be(cinfo, input_buf, input_row, output_buf, num_rows);
+ else
+ rgb_rgb565_convert_le(cinfo, input_buf, input_row, output_buf, num_rows);
+}
+
+
+METHODDEF(void)
+rgb_rgb565D_convert(j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
+ JDIMENSION input_row, JSAMPARRAY output_buf, int num_rows)
+{
+ if (is_big_endian())
+ rgb_rgb565D_convert_be(cinfo, input_buf, input_row, output_buf, num_rows);
+ else
+ rgb_rgb565D_convert_le(cinfo, input_buf, input_row, output_buf, num_rows);
+}
+
+
+METHODDEF(void)
+gray_rgb565_convert(j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
+ JDIMENSION input_row, JSAMPARRAY output_buf, int num_rows)
+{
+ if (is_big_endian())
+ gray_rgb565_convert_be(cinfo, input_buf, input_row, output_buf, num_rows);
+ else
+ gray_rgb565_convert_le(cinfo, input_buf, input_row, output_buf, num_rows);
+}
+
+
+METHODDEF(void)
+gray_rgb565D_convert(j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
+ JDIMENSION input_row, JSAMPARRAY output_buf, int num_rows)
+{
+ if (is_big_endian())
+ gray_rgb565D_convert_be(cinfo, input_buf, input_row, output_buf, num_rows);
+ else
+ gray_rgb565D_convert_le(cinfo, input_buf, input_row, output_buf, num_rows);
+}
+
+
+/*
+ * 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));
+ 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 */
+ 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) {
+ 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;
+ } else if (cinfo->jpeg_color_space == JCS_RGB) {
+ cconvert->pub.color_convert = rgb_gray_convert;
+ build_rgb_y_table(cinfo);
+ } 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:
+ case JCS_EXT_XRGB:
+ case JCS_EXT_RGBA:
+ case JCS_EXT_BGRA:
+ case JCS_EXT_ABGR:
+ case JCS_EXT_ARGB:
+ cinfo->out_color_components = rgb_pixelsize[cinfo->out_color_space];
+ if (cinfo->jpeg_color_space == JCS_YCbCr) {
+ if (jsimd_can_ycc_rgb())
+ cconvert->pub.color_convert = jsimd_ycc_rgb_convert;
+ else {
+ cconvert->pub.color_convert = ycc_rgb_convert;
+ build_ycc_rgb_table(cinfo);
+ }
+ } else if (cinfo->jpeg_color_space == JCS_GRAYSCALE) {
+ cconvert->pub.color_convert = gray_rgb_convert;
+ } else if (cinfo->jpeg_color_space == JCS_RGB) {
+ if (rgb_red[cinfo->out_color_space] == 0 &&
+ rgb_green[cinfo->out_color_space] == 1 &&
+ rgb_blue[cinfo->out_color_space] == 2 &&
+ rgb_pixelsize[cinfo->out_color_space] == 3)
+ cconvert->pub.color_convert = null_convert;
+ else
+ cconvert->pub.color_convert = rgb_rgb_convert;
+ } else
+ ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
+ break;
+
+ case JCS_RGB565:
+ cinfo->out_color_components = 3;
+ if (cinfo->dither_mode == JDITHER_NONE) {
+ if (cinfo->jpeg_color_space == JCS_YCbCr) {
+ if (jsimd_can_ycc_rgb565())
+ cconvert->pub.color_convert = jsimd_ycc_rgb565_convert;
+ else {
+ cconvert->pub.color_convert = ycc_rgb565_convert;
+ build_ycc_rgb_table(cinfo);
+ }
+ } else if (cinfo->jpeg_color_space == JCS_GRAYSCALE) {
+ cconvert->pub.color_convert = gray_rgb565_convert;
+ } else if (cinfo->jpeg_color_space == JCS_RGB) {
+ cconvert->pub.color_convert = rgb_rgb565_convert;
+ } else
+ ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
+ } else {
+ /* only ordered dithering is supported */
+ if (cinfo->jpeg_color_space == JCS_YCbCr) {
+ cconvert->pub.color_convert = ycc_rgb565D_convert;
+ build_ycc_rgb_table(cinfo);
+ } else if (cinfo->jpeg_color_space == JCS_GRAYSCALE) {
+ cconvert->pub.color_convert = gray_rgb565D_convert;
+ } else if (cinfo->jpeg_color_space == JCS_RGB) {
+ cconvert->pub.color_convert = rgb_rgb565D_convert;
+ } else
+ ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
+ }
+ break;
+
+ case JCS_CMYK:
+ cinfo->out_color_components = 4;
+ if (cinfo->jpeg_color_space == JCS_YCCK) {
+ cconvert->pub.color_convert = ycck_cmyk_convert;
+ build_ycc_rgb_table(cinfo);
+ } else if (cinfo->jpeg_color_space == JCS_CMYK) {
+ 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 */
+ 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;
+}