/* * 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 <[email protected]> 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" /* Private subobject */ 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 … #define ONE_HALF … #define FIX(x) … /* 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 … #define G_Y_OFF … #define B_Y_OFF … #define TABLE_SIZE … /* Include inline routines for colorspace extensions */ #include "jdcolext.c" #undef RGB_RED #undef RGB_GREEN #undef RGB_BLUE #undef RGB_PIXELSIZE #define RGB_RED … #define RGB_GREEN … #define RGB_BLUE … #define RGB_PIXELSIZE … #define ycc_rgb_convert_internal … #define gray_rgb_convert_internal … #define rgb_rgb_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 … #define RGB_GREEN … #define RGB_BLUE … #define RGB_ALPHA … #define RGB_PIXELSIZE … #define ycc_rgb_convert_internal … #define gray_rgb_convert_internal … #define rgb_rgb_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 … #define RGB_GREEN … #define RGB_BLUE … #define RGB_PIXELSIZE … #define ycc_rgb_convert_internal … #define gray_rgb_convert_internal … #define rgb_rgb_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 … #define RGB_GREEN … #define RGB_BLUE … #define RGB_ALPHA … #define RGB_PIXELSIZE … #define ycc_rgb_convert_internal … #define gray_rgb_convert_internal … #define rgb_rgb_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 … #define RGB_GREEN … #define RGB_BLUE … #define RGB_ALPHA … #define RGB_PIXELSIZE … #define ycc_rgb_convert_internal … #define gray_rgb_convert_internal … #define rgb_rgb_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 … #define RGB_GREEN … #define RGB_BLUE … #define RGB_ALPHA … #define RGB_PIXELSIZE … #define ycc_rgb_convert_internal … #define gray_rgb_convert_internal … #define rgb_rgb_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) { … } /* * 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) { … } /**************** Cases other than YCbCr -> RGB **************/ /* * Initialize for RGB->grayscale colorspace conversion. */ LOCAL(void) build_rgb_y_table(j_decompress_ptr cinfo) { … } /* * 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) { … } /* * 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) { … } /* * 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) { … } /* * 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) { … } /* * 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) { … } /* * 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) { … } /* * RGB565 conversion */ #define PACK_SHORT_565_LE(r, g, b) … #define PACK_SHORT_565_BE(r, g, b) … #define PACK_TWO_PIXELS_LE(l, r) … #define PACK_TWO_PIXELS_BE(l, r) … #define PACK_NEED_ALIGNMENT(ptr) … #define WRITE_TWO_ALIGNED_PIXELS(addr, pixels) … #define DITHER_565_R(r, dither) … #define DITHER_565_G(g, dither) … #define DITHER_565_B(b, dither) … /* 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 … #define DITHER_ROTATE(x) … static const JLONG dither_matrix[4] = …; static INLINE boolean is_big_endian(void) { … } /* Include inline routines for RGB565 conversion */ #define PACK_SHORT_565 … #define PACK_TWO_PIXELS … #define ycc_rgb565_convert_internal … #define ycc_rgb565D_convert_internal … #define rgb_rgb565_convert_internal … #define rgb_rgb565D_convert_internal … #define gray_rgb565_convert_internal … #define gray_rgb565D_convert_internal … #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 … #define PACK_TWO_PIXELS … #define ycc_rgb565_convert_internal … #define ycc_rgb565D_convert_internal … #define rgb_rgb565_convert_internal … #define rgb_rgb565D_convert_internal … #define gray_rgb565_convert_internal … #define gray_rgb565D_convert_internal … #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) { … } METHODDEF(void) ycc_rgb565D_convert(j_decompress_ptr cinfo, JSAMPIMAGE input_buf, JDIMENSION input_row, JSAMPARRAY output_buf, int num_rows) { … } METHODDEF(void) rgb_rgb565_convert(j_decompress_ptr cinfo, JSAMPIMAGE input_buf, JDIMENSION input_row, JSAMPARRAY output_buf, int num_rows) { … } METHODDEF(void) rgb_rgb565D_convert(j_decompress_ptr cinfo, JSAMPIMAGE input_buf, JDIMENSION input_row, JSAMPARRAY output_buf, int num_rows) { … } METHODDEF(void) gray_rgb565_convert(j_decompress_ptr cinfo, JSAMPIMAGE input_buf, JDIMENSION input_row, JSAMPARRAY output_buf, int num_rows) { … } METHODDEF(void) gray_rgb565D_convert(j_decompress_ptr cinfo, JSAMPIMAGE input_buf, JDIMENSION input_row, JSAMPARRAY output_buf, int num_rows) { … } /* * Empty method for start_pass. */ METHODDEF(void) start_pass_dcolor(j_decompress_ptr cinfo) { … } /* * Module initialization routine for output colorspace conversion. */ GLOBAL(void) jinit_color_deconverter(j_decompress_ptr cinfo) { … }
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