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improve I/O performance on BMP writing through buffering

This commit is contained in:
mpetavy 2018-03-06 12:58:29 +01:00
parent a59512e099
commit ffb7667593
2 changed files with 27 additions and 2 deletions
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1
THANKS.md
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@ -37,3 +37,4 @@ it complete and exempt of errors.
* Vincent Torri * Vincent Torri
* Yannick Verschueren * Yannick Verschueren
* Peter Wimmer * Peter Wimmer
* Marcel Petavy

28
src/bin/jp2/convertbmp.c
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@ -955,6 +955,10 @@ int imagetobmp(opj_image_t * image, const char *outfile)
adjustB = 0; adjustB = 0;
} }
int max = 1024*1024;
OPJ_UINT8 *pBuffer = (OPJ_UINT8 *) calloc(1, max);
int c = 0;
for (i = 0; i < w * h; i++) { for (i = 0; i < w * h; i++) {
OPJ_UINT8 rc, gc, bc; OPJ_UINT8 rc, gc, bc;
int r, g, b; int r, g, b;
@ -995,15 +999,35 @@ int imagetobmp(opj_image_t * image, const char *outfile)
} }
bc = (OPJ_UINT8)b; bc = (OPJ_UINT8)b;
fprintf(fdest, "%c%c%c", bc, gc, rc); if(c >= (max - 3)) {
fwrite(pBuffer,1,c,fdest);
c = 0;
}
*(pBuffer + c++) = bc;
*(pBuffer + c++) = gc;
*(pBuffer + c++) = rc;
if ((i + 1) % w == 0) { if ((i + 1) % w == 0) {
for (pad = ((3 * w) % 4) ? (4 - (3 * w) % 4) : 0; pad > 0; pad--) { /* ADD */ for (pad = ((3 * w) % 4) ? (4 - (3 * w) % 4) : 0; pad > 0; pad--) { /* ADD */
fprintf(fdest, "%c", 0);
if(c >= (max - 1)) {
fwrite(pBuffer,1,c,fdest);
c = 0;
}
*(pBuffer + c++) = 0;
} }
} }
} }
if(c > 0) {
fwrite(pBuffer,1,c,fdest);
}
fclose(fdest); fclose(fdest);
free(pBuffer);
} else { /* Gray-scale */ } else { /* Gray-scale */
/* -->> -->> -->> -->> /* -->> -->> -->> -->>