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imagetopgx(): improve performance in 8 bit case (relates to broken.jpc test case)

This commit is contained in:
Even Rouault 2017-08-24 14:09:31 +02:00
parent fdcd4e6365
commit 5146abc02e
1 changed files with 47 additions and 13 deletions
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60
src/bin/jp2/convert.c
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@ -1332,7 +1332,7 @@ opj_image_t* pgxtoimage(const char *filename, opj_cparameters_t *parameters)
return image;
}
#define CLAMP(x,a,b) x < a ? a : (x > b ? b : x)
#define CLAMP(x,a,b) ((x) < (a) ? (a) : ((x) > (b) ? (b) : (x)))
static INLINE int clamp(const int value, const int prec, const int sgnd)
{
@ -1412,25 +1412,59 @@ int imagetopgx(opj_image_t * image, const char *outfile)
nbytes = 4;
}
for (i = 0; i < w * h; i++) {
/* FIXME: clamp func is being called within a loop */
const int val = clamp(image->comps[compno].data[i],
(int)comp->prec, (int)comp->sgnd);
for (j = nbytes - 1; j >= 0; j--) {
int v = (int)(val >> (j * 8));
unsigned char byte = (unsigned char)v;
res = fwrite(&byte, 1, 1, fdest);
if (res < 1) {
fprintf(stderr, "failed to write 1 byte for %s\n", name);
if (nbytes == 1) {
unsigned char* line_buffer = malloc((size_t)w);
if (line_buffer == NULL) {
fprintf(stderr, "Out of memory");
goto fin;
}
for (j = 0; j < h; j++) {
if (comp->prec == 8 && comp->sgnd == 0) {
for (i = 0; i < w; i++) {
line_buffer[i] = (unsigned char)CLAMP(image->comps[compno].data[j * w + i], 0,
255);
}
} else {
for (i = 0; i < w; i++) {
line_buffer[i] = (unsigned char)
clamp(image->comps[compno].data[j * w + i],
(int)comp->prec, (int)comp->sgnd);
}
}
res = fwrite(line_buffer, 1, (size_t)w, fdest);
if (res != (size_t)w) {
fprintf(stderr, "failed to write %d bytes for %s\n", w, name);
if (total > 256) {
free(name);
}
free(line_buffer);
goto fin;
}
}
free(line_buffer);
} else {
for (i = 0; i < w * h; i++) {
/* FIXME: clamp func is being called within a loop */
const int val = clamp(image->comps[compno].data[i],
(int)comp->prec, (int)comp->sgnd);
for (j = nbytes - 1; j >= 0; j--) {
int v = (int)(val >> (j * 8));
unsigned char byte = (unsigned char)v;
res = fwrite(&byte, 1, 1, fdest);
if (res < 1) {
fprintf(stderr, "failed to write 1 byte for %s\n", name);
if (total > 256) {
free(name);
}
goto fin;
}
}
}
}
if (total > 256) {
free(name);
}