/* * jdmrg565.c * * This file was part of the Independent JPEG Group's software: * Copyright (C) 1994-1996, Thomas G. Lane. * libjpeg-turbo Modifications: * Copyright (C) 2013, Linaro Limited. * Copyright (C) 2014-2015, 2018, 2020, 2022, D. R. Commander. * For conditions of distribution and use, see the accompanying README.ijg * file. * * This file contains code for merged upsampling/color conversion.
*/
INLINE
LOCAL(void)
h2v1_merged_upsample_565_internal(j_decompress_ptr cinfo,
_JSAMPIMAGE input_buf,
JDIMENSION in_row_group_ctr,
_JSAMPARRAY output_buf)
{
my_merged_upsample_ptr upsample = (my_merged_upsample_ptr)cinfo->upsample; registerint y, cred, cgreen, cblue; int cb, cr; register _JSAMPROW outptr;
_JSAMPROW inptr0, inptr1, inptr2;
JDIMENSION col; /* copy these pointers into registers if possible */ register _JSAMPLE *range_limit = (_JSAMPLE *)cinfo->sample_range_limit; int *Crrtab = upsample->Cr_r_tab; int *Cbbtab = upsample->Cb_b_tab;
JLONG *Crgtab = upsample->Cr_g_tab;
JLONG *Cbgtab = upsample->Cb_g_tab; unsignedint r, g, b;
JLONG rgb;
SHIFT_TEMPS
/* Loop for each pair of output pixels */ for (col = cinfo->output_width >> 1; col > 0; col--) { /* Do the chroma part of the calculation */
cb = *inptr1++;
cr = *inptr2++;
cred = Crrtab[cr];
cgreen = (int)RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS);
cblue = Cbbtab[cb];
/* Fetch 2 Y values and emit 2 pixels */
y = *inptr0++;
r = range_limit[y + cred];
g = range_limit[y + cgreen];
b = range_limit[y + cblue];
rgb = PACK_SHORT_565(r, g, b);
y = *inptr0++;
r = range_limit[y + cred];
g = range_limit[y + cgreen];
b = range_limit[y + cblue];
rgb = PACK_TWO_PIXELS(rgb, PACK_SHORT_565(r, g, b));
WRITE_TWO_PIXELS(outptr, rgb);
outptr += 4;
}
/* If image width is odd, do the last output column separately */ if (cinfo->output_width & 1) {
cb = *inptr1;
cr = *inptr2;
cred = Crrtab[cr];
cgreen = (int)RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS);
cblue = Cbbtab[cb];
y = *inptr0;
r = range_limit[y + cred];
g = range_limit[y + cgreen];
b = range_limit[y + cblue];
rgb = PACK_SHORT_565(r, g, b);
*(INT16 *)outptr = (INT16)rgb;
}
}
INLINE
LOCAL(void)
h2v1_merged_upsample_565D_internal(j_decompress_ptr cinfo,
_JSAMPIMAGE input_buf,
JDIMENSION in_row_group_ctr,
_JSAMPARRAY output_buf)
{
my_merged_upsample_ptr upsample = (my_merged_upsample_ptr)cinfo->upsample; registerint y, cred, cgreen, cblue; int cb, cr; register _JSAMPROW outptr;
_JSAMPROW inptr0, inptr1, inptr2;
JDIMENSION col; /* copy these pointers into registers if possible */ register _JSAMPLE *range_limit = (_JSAMPLE *)cinfo->sample_range_limit; int *Crrtab = upsample->Cr_r_tab; int *Cbbtab = upsample->Cb_b_tab;
JLONG *Crgtab = upsample->Cr_g_tab;
JLONG *Cbgtab = upsample->Cb_g_tab;
JLONG d0 = dither_matrix[cinfo->output_scanline & DITHER_MASK]; unsignedint r, g, b;
JLONG rgb;
SHIFT_TEMPS
/* Loop for each pair of output pixels */ for (col = cinfo->output_width >> 1; col > 0; col--) { /* Do the chroma part of the calculation */
cb = *inptr1++;
cr = *inptr2++;
cred = Crrtab[cr];
cgreen = (int)RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS);
cblue = Cbbtab[cb];
/* Fetch 2 Y values and emit 2 pixels */
y = *inptr0++;
r = range_limit[DITHER_565_R(y + cred, d0)];
g = range_limit[DITHER_565_G(y + cgreen, d0)];
b = range_limit[DITHER_565_B(y + cblue, d0)];
d0 = DITHER_ROTATE(d0);
rgb = PACK_SHORT_565(r, g, b);
y = *inptr0++;
r = range_limit[DITHER_565_R(y + cred, d0)];
g = range_limit[DITHER_565_G(y + cgreen, d0)];
b = range_limit[DITHER_565_B(y + cblue, d0)];
d0 = DITHER_ROTATE(d0);
rgb = PACK_TWO_PIXELS(rgb, PACK_SHORT_565(r, g, b));
WRITE_TWO_PIXELS(outptr, rgb);
outptr += 4;
}
/* If image width is odd, do the last output column separately */ if (cinfo->output_width & 1) {
cb = *inptr1;
cr = *inptr2;
cred = Crrtab[cr];
cgreen = (int)RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS);
cblue = Cbbtab[cb];
y = *inptr0;
r = range_limit[DITHER_565_R(y + cred, d0)];
g = range_limit[DITHER_565_G(y + cgreen, d0)];
b = range_limit[DITHER_565_B(y + cblue, d0)];
rgb = PACK_SHORT_565(r, g, b);
*(INT16 *)outptr = (INT16)rgb;
}
}
INLINE
LOCAL(void)
h2v2_merged_upsample_565_internal(j_decompress_ptr cinfo, _JSAMPIMAGE input_buf,
JDIMENSION in_row_group_ctr,
_JSAMPARRAY output_buf)
{
my_merged_upsample_ptr upsample = (my_merged_upsample_ptr)cinfo->upsample; registerint y, cred, cgreen, cblue; int cb, cr; register _JSAMPROW outptr0, outptr1;
_JSAMPROW inptr00, inptr01, inptr1, inptr2;
JDIMENSION col; /* copy these pointers into registers if possible */ register _JSAMPLE *range_limit = (_JSAMPLE *)cinfo->sample_range_limit; int *Crrtab = upsample->Cr_r_tab; int *Cbbtab = upsample->Cb_b_tab;
JLONG *Crgtab = upsample->Cr_g_tab;
JLONG *Cbgtab = upsample->Cb_g_tab; unsignedint r, g, b;
JLONG rgb;
SHIFT_TEMPS
/* Loop for each group of output pixels */ for (col = cinfo->output_width >> 1; col > 0; col--) { /* Do the chroma part of the calculation */
cb = *inptr1++;
cr = *inptr2++;
cred = Crrtab[cr];
cgreen = (int)RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS);
cblue = Cbbtab[cb];
/* Fetch 4 Y values and emit 4 pixels */
y = *inptr00++;
r = range_limit[y + cred];
g = range_limit[y + cgreen];
b = range_limit[y + cblue];
rgb = PACK_SHORT_565(r, g, b);
y = *inptr00++;
r = range_limit[y + cred];
g = range_limit[y + cgreen];
b = range_limit[y + cblue];
rgb = PACK_TWO_PIXELS(rgb, PACK_SHORT_565(r, g, b));
WRITE_TWO_PIXELS(outptr0, rgb);
outptr0 += 4;
y = *inptr01++;
r = range_limit[y + cred];
g = range_limit[y + cgreen];
b = range_limit[y + cblue];
rgb = PACK_SHORT_565(r, g, b);
y = *inptr01++;
r = range_limit[y + cred];
g = range_limit[y + cgreen];
b = range_limit[y + cblue];
rgb = PACK_TWO_PIXELS(rgb, PACK_SHORT_565(r, g, b));
WRITE_TWO_PIXELS(outptr1, rgb);
outptr1 += 4;
}
/* If image width is odd, do the last output column separately */ if (cinfo->output_width & 1) {
cb = *inptr1;
cr = *inptr2;
cred = Crrtab[cr];
cgreen = (int)RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS);
cblue = Cbbtab[cb];
y = *inptr00;
r = range_limit[y + cred];
g = range_limit[y + cgreen];
b = range_limit[y + cblue];
rgb = PACK_SHORT_565(r, g, b);
*(INT16 *)outptr0 = (INT16)rgb;
y = *inptr01;
r = range_limit[y + cred];
g = range_limit[y + cgreen];
b = range_limit[y + cblue];
rgb = PACK_SHORT_565(r, g, b);
*(INT16 *)outptr1 = (INT16)rgb;
}
}
/* Loop for each group of output pixels */ for (col = cinfo->output_width >> 1; col > 0; col--) { /* Do the chroma part of the calculation */
cb = *inptr1++;
cr = *inptr2++;
cred = Crrtab[cr];
cgreen = (int)RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS);
cblue = Cbbtab[cb];
/* Fetch 4 Y values and emit 4 pixels */
y = *inptr00++;
r = range_limit[DITHER_565_R(y + cred, d0)];
g = range_limit[DITHER_565_G(y + cgreen, d0)];
b = range_limit[DITHER_565_B(y + cblue, d0)];
d0 = DITHER_ROTATE(d0);
rgb = PACK_SHORT_565(r, g, b);
y = *inptr00++;
r = range_limit[DITHER_565_R(y + cred, d0)];
g = range_limit[DITHER_565_G(y + cgreen, d0)];
b = range_limit[DITHER_565_B(y + cblue, d0)];
d0 = DITHER_ROTATE(d0);
rgb = PACK_TWO_PIXELS(rgb, PACK_SHORT_565(r, g, b));
WRITE_TWO_PIXELS(outptr0, rgb);
outptr0 += 4;
y = *inptr01++;
r = range_limit[DITHER_565_R(y + cred, d1)];
g = range_limit[DITHER_565_G(y + cgreen, d1)];
b = range_limit[DITHER_565_B(y + cblue, d1)];
d1 = DITHER_ROTATE(d1);
rgb = PACK_SHORT_565(r, g, b);
y = *inptr01++;
r = range_limit[DITHER_565_R(y + cred, d1)];
g = range_limit[DITHER_565_G(y + cgreen, d1)];
b = range_limit[DITHER_565_B(y + cblue, d1)];
d1 = DITHER_ROTATE(d1);
rgb = PACK_TWO_PIXELS(rgb, PACK_SHORT_565(r, g, b));
WRITE_TWO_PIXELS(outptr1, rgb);
outptr1 += 4;
}
/* If image width is odd, do the last output column separately */ if (cinfo->output_width & 1) {
cb = *inptr1;
cr = *inptr2;
cred = Crrtab[cr];
cgreen = (int)RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS);
cblue = Cbbtab[cb];
y = *inptr00;
r = range_limit[DITHER_565_R(y + cred, d0)];
g = range_limit[DITHER_565_G(y + cgreen, d0)];
b = range_limit[DITHER_565_B(y + cblue, d0)];
rgb = PACK_SHORT_565(r, g, b);
*(INT16 *)outptr0 = (INT16)rgb;
y = *inptr01;
r = range_limit[DITHER_565_R(y + cred, d1)];
g = range_limit[DITHER_565_G(y + cgreen, d1)];
b = range_limit[DITHER_565_B(y + cblue, d1)];
rgb = PACK_SHORT_565(r, g, b);
*(INT16 *)outptr1 = (INT16)rgb;
}
}
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