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12-bit: Set alpha channel to 4095 rather than 255

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This commit is contained in:
DRC
2023-01-17 11:04:38 -06:00
parent 0c0df2d0c7
commit 08cbc23334
4 changed files with 31 additions and 27 deletions
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4
ChangeLog.md
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@@ -41,6 +41,10 @@ strides to pass to `tjDecompressToYUVPlanes()`. This caused a buffer overrun
and subsequent segfault if the desired image dimensions exceeded the scaled
image dimensions.
7. Fixed an issue whereby, when decompressing a 12-bit-per-component JPEG image
(`-DWITH_12BIT=1`) using an alpha-enabled output color space such as
`JCS_EXT_RGBA`, the alpha channel was set to 255 rather than 4095.
2.1.4
=====

14
jdcolext.c
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@@ -4,7 +4,7 @@
* This file was part of the Independent JPEG Group's software:
* Copyright (C) 1991-1997, Thomas G. Lane.
* libjpeg-turbo Modifications:
* Copyright (C) 2009, 2011, 2015, D. R. Commander.
* Copyright (C) 2009, 2011, 2015, 2023, D. R. Commander.
* For conditions of distribution and use, see the accompanying README.ijg
* file.
*
@@ -62,10 +62,10 @@ ycc_rgb_convert_internal(j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
((int)RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr],
SCALEBITS))];
outptr[RGB_BLUE] = range_limit[y + Cbbtab[cb]];
/* Set unused byte to 0xFF so it can be interpreted as an opaque */
/* Set unused byte to MAXJSAMPLE so it can be interpreted as an opaque */
/* alpha channel value */
#ifdef RGB_ALPHA
outptr[RGB_ALPHA] = 0xFF;
outptr[RGB_ALPHA] = MAXJSAMPLE;
#endif
outptr += RGB_PIXELSIZE;
}
@@ -94,10 +94,10 @@ gray_rgb_convert_internal(j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
outptr = *output_buf++;
for (col = 0; col < num_cols; col++) {
outptr[RGB_RED] = outptr[RGB_GREEN] = outptr[RGB_BLUE] = inptr[col];
/* Set unused byte to 0xFF so it can be interpreted as an opaque */
/* Set unused byte to MAXJSAMPLE so it can be interpreted as an opaque */
/* alpha channel value */
#ifdef RGB_ALPHA
outptr[RGB_ALPHA] = 0xFF;
outptr[RGB_ALPHA] = MAXJSAMPLE;
#endif
outptr += RGB_PIXELSIZE;
}
@@ -130,10 +130,10 @@ rgb_rgb_convert_internal(j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
outptr[RGB_RED] = inptr0[col];
outptr[RGB_GREEN] = inptr1[col];
outptr[RGB_BLUE] = inptr2[col];
/* Set unused byte to 0xFF so it can be interpreted as an opaque */
/* Set unused byte to MAXJSAMPLE so it can be interpreted as an opaque */
/* alpha channel value */
#ifdef RGB_ALPHA
outptr[RGB_ALPHA] = 0xFF;
outptr[RGB_ALPHA] = MAXJSAMPLE;
#endif
outptr += RGB_PIXELSIZE;
}

20
jdmrgext.c
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@@ -4,7 +4,7 @@
* This file was part of the Independent JPEG Group's software:
* Copyright (C) 1994-1996, Thomas G. Lane.
* libjpeg-turbo Modifications:
* Copyright (C) 2011, 2015, 2020, D. R. Commander.
* Copyright (C) 2011, 2015, 2020, 2023, D. R. Commander.
* For conditions of distribution and use, see the accompanying README.ijg
* file.
*
@@ -57,7 +57,7 @@ h2v1_merged_upsample_internal(j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
outptr[RGB_GREEN] = range_limit[y + cgreen];
outptr[RGB_BLUE] = range_limit[y + cblue];
#ifdef RGB_ALPHA
outptr[RGB_ALPHA] = 0xFF;
outptr[RGB_ALPHA] = MAXJSAMPLE;
#endif
outptr += RGB_PIXELSIZE;
y = *inptr0++;
@@ -65,7 +65,7 @@ h2v1_merged_upsample_internal(j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
outptr[RGB_GREEN] = range_limit[y + cgreen];
outptr[RGB_BLUE] = range_limit[y + cblue];
#ifdef RGB_ALPHA
outptr[RGB_ALPHA] = 0xFF;
outptr[RGB_ALPHA] = MAXJSAMPLE;
#endif
outptr += RGB_PIXELSIZE;
}
@@ -81,7 +81,7 @@ h2v1_merged_upsample_internal(j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
outptr[RGB_GREEN] = range_limit[y + cgreen];
outptr[RGB_BLUE] = range_limit[y + cblue];
#ifdef RGB_ALPHA
outptr[RGB_ALPHA] = 0xFF;
outptr[RGB_ALPHA] = MAXJSAMPLE;
#endif
}
}
@@ -131,7 +131,7 @@ h2v2_merged_upsample_internal(j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
outptr0[RGB_GREEN] = range_limit[y + cgreen];
outptr0[RGB_BLUE] = range_limit[y + cblue];
#ifdef RGB_ALPHA
outptr0[RGB_ALPHA] = 0xFF;
outptr0[RGB_ALPHA] = MAXJSAMPLE;
#endif
outptr0 += RGB_PIXELSIZE;
y = *inptr00++;
@@ -139,7 +139,7 @@ h2v2_merged_upsample_internal(j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
outptr0[RGB_GREEN] = range_limit[y + cgreen];
outptr0[RGB_BLUE] = range_limit[y + cblue];
#ifdef RGB_ALPHA
outptr0[RGB_ALPHA] = 0xFF;
outptr0[RGB_ALPHA] = MAXJSAMPLE;
#endif
outptr0 += RGB_PIXELSIZE;
y = *inptr01++;
@@ -147,7 +147,7 @@ h2v2_merged_upsample_internal(j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
outptr1[RGB_GREEN] = range_limit[y + cgreen];
outptr1[RGB_BLUE] = range_limit[y + cblue];
#ifdef RGB_ALPHA
outptr1[RGB_ALPHA] = 0xFF;
outptr1[RGB_ALPHA] = MAXJSAMPLE;
#endif
outptr1 += RGB_PIXELSIZE;
y = *inptr01++;
@@ -155,7 +155,7 @@ h2v2_merged_upsample_internal(j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
outptr1[RGB_GREEN] = range_limit[y + cgreen];
outptr1[RGB_BLUE] = range_limit[y + cblue];
#ifdef RGB_ALPHA
outptr1[RGB_ALPHA] = 0xFF;
outptr1[RGB_ALPHA] = MAXJSAMPLE;
#endif
outptr1 += RGB_PIXELSIZE;
}
@@ -171,14 +171,14 @@ h2v2_merged_upsample_internal(j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
outptr0[RGB_GREEN] = range_limit[y + cgreen];
outptr0[RGB_BLUE] = range_limit[y + cblue];
#ifdef RGB_ALPHA
outptr0[RGB_ALPHA] = 0xFF;
outptr0[RGB_ALPHA] = MAXJSAMPLE;
#endif
y = *inptr01;
outptr1[RGB_RED] = range_limit[y + cred];
outptr1[RGB_GREEN] = range_limit[y + cgreen];
outptr1[RGB_BLUE] = range_limit[y + cblue];
#ifdef RGB_ALPHA
outptr1[RGB_ALPHA] = 0xFF;
outptr1[RGB_ALPHA] = MAXJSAMPLE;
#endif
}
}

20
rdppm.c
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@@ -5,7 +5,7 @@
* Copyright (C) 1991-1997, Thomas G. Lane.
* Modified 2009 by Bill Allombert, Guido Vollbeding.
* libjpeg-turbo Modifications:
* Copyright (C) 2015-2017, 2020-2022, D. R. Commander.
* Copyright (C) 2015-2017, 2020-2023, D. R. Commander.
* For conditions of distribution and use, see the accompanying README.ijg
* file.
*
@@ -179,13 +179,13 @@ get_text_gray_rgb_row(j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
if (maxval == MAXJSAMPLE) {
if (aindex >= 0)
GRAY_RGB_READ_LOOP((JSAMPLE)read_pbm_integer(cinfo, infile, maxval),
ptr[aindex] = 0xFF;)
ptr[aindex] = MAXJSAMPLE;)
else
GRAY_RGB_READ_LOOP((JSAMPLE)read_pbm_integer(cinfo, infile, maxval), {})
} else {
if (aindex >= 0)
GRAY_RGB_READ_LOOP(rescale[read_pbm_integer(cinfo, infile, maxval)],
ptr[aindex] = 0xFF;)
ptr[aindex] = MAXJSAMPLE;)
else
GRAY_RGB_READ_LOOP(rescale[read_pbm_integer(cinfo, infile, maxval)], {})
}
@@ -253,13 +253,13 @@ get_text_rgb_row(j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
if (maxval == MAXJSAMPLE) {
if (aindex >= 0)
RGB_READ_LOOP((JSAMPLE)read_pbm_integer(cinfo, infile, maxval),
ptr[aindex] = 0xFF;)
ptr[aindex] = MAXJSAMPLE;)
else
RGB_READ_LOOP((JSAMPLE)read_pbm_integer(cinfo, infile, maxval), {})
} else {
if (aindex >= 0)
RGB_READ_LOOP(rescale[read_pbm_integer(cinfo, infile, maxval)],
ptr[aindex] = 0xFF;)
ptr[aindex] = MAXJSAMPLE;)
else
RGB_READ_LOOP(rescale[read_pbm_integer(cinfo, infile, maxval)], {})
}
@@ -345,12 +345,12 @@ get_gray_rgb_row(j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
bufferptr = source->iobuffer;
if (maxval == MAXJSAMPLE) {
if (aindex >= 0)
GRAY_RGB_READ_LOOP(*bufferptr++, ptr[aindex] = 0xFF;)
GRAY_RGB_READ_LOOP(*bufferptr++, ptr[aindex] = MAXJSAMPLE;)
else
GRAY_RGB_READ_LOOP(*bufferptr++, {})
} else {
if (aindex >= 0)
GRAY_RGB_READ_LOOP(rescale[UCH(*bufferptr++)], ptr[aindex] = 0xFF;)
GRAY_RGB_READ_LOOP(rescale[UCH(*bufferptr++)], ptr[aindex] = MAXJSAMPLE;)
else
GRAY_RGB_READ_LOOP(rescale[UCH(*bufferptr++)], {})
}
@@ -413,12 +413,12 @@ get_rgb_row(j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
bufferptr = source->iobuffer;
if (maxval == MAXJSAMPLE) {
if (aindex >= 0)
RGB_READ_LOOP(*bufferptr++, ptr[aindex] = 0xFF;)
RGB_READ_LOOP(*bufferptr++, ptr[aindex] = MAXJSAMPLE;)
else
RGB_READ_LOOP(*bufferptr++, {})
} else {
if (aindex >= 0)
RGB_READ_LOOP(rescale[UCH(*bufferptr++)], ptr[aindex] = 0xFF;)
RGB_READ_LOOP(rescale[UCH(*bufferptr++)], ptr[aindex] = MAXJSAMPLE;)
else
RGB_READ_LOOP(rescale[UCH(*bufferptr++)], {})
}
@@ -543,7 +543,7 @@ get_word_rgb_row(j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
ERREXIT(cinfo, JERR_PPM_OUTOFRANGE);
ptr[bindex] = rescale[temp];
if (aindex >= 0)
ptr[aindex] = 0xFF;
ptr[aindex] = MAXJSAMPLE;
ptr += ps;
}
return 1;