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imagetobmp: avoid shift by -1 (relates to #811)

This commit is contained in:
Even Rouault 2017-08-09 09:42:30 +02:00
parent 0c07950cb3
commit 5a560ebf51
1 changed files with 12 additions and 4 deletions
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16
src/bin/jp2/convertbmp.c
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@ -929,7 +929,9 @@ int imagetobmp(opj_image_t * image, const char *outfile)
r = image->comps[0].data[w * h - ((i) / (w) + 1) * w + (i) % (w)];
r += (image->comps[0].sgnd ? 1 << (image->comps[0].prec - 1) : 0);
r = ((r >> adjustR) + ((r >> (adjustR - 1)) % 2));
if (adjustR > 0) {
r = ((r >> adjustR) + ((r >> (adjustR - 1)) % 2));
}
if (r > 255) {
r = 255;
} else if (r < 0) {
@ -939,7 +941,9 @@ int imagetobmp(opj_image_t * image, const char *outfile)
g = image->comps[1].data[w * h - ((i) / (w) + 1) * w + (i) % (w)];
g += (image->comps[1].sgnd ? 1 << (image->comps[1].prec - 1) : 0);
g = ((g >> adjustG) + ((g >> (adjustG - 1)) % 2));
if (adjustG > 0) {
g = ((g >> adjustG) + ((g >> (adjustG - 1)) % 2));
}
if (g > 255) {
g = 255;
} else if (g < 0) {
@ -949,7 +953,9 @@ int imagetobmp(opj_image_t * image, const char *outfile)
b = image->comps[2].data[w * h - ((i) / (w) + 1) * w + (i) % (w)];
b += (image->comps[2].sgnd ? 1 << (image->comps[2].prec - 1) : 0);
b = ((b >> adjustB) + ((b >> (adjustB - 1)) % 2));
if (adjustB > 0) {
b = ((b >> adjustB) + ((b >> (adjustB - 1)) % 2));
}
if (b > 255) {
b = 255;
} else if (b < 0) {
@ -1044,7 +1050,9 @@ int imagetobmp(opj_image_t * image, const char *outfile)
r = image->comps[0].data[w * h - ((i) / (w) + 1) * w + (i) % (w)];
r += (image->comps[0].sgnd ? 1 << (image->comps[0].prec - 1) : 0);
r = ((r >> adjustR) + ((r >> (adjustR - 1)) % 2));
if (adjustR > 0) {
r = ((r >> adjustR) + ((r >> (adjustR - 1)) % 2));
}
if (r > 255) {
r = 255;
} else if (r < 0) {