[EGIT] [legacy-imlib2] 01/01: JPEG loader: Use mmap'ed file access

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commit 33ab86c10ff9f7cc737b87b52d6d628b3e89bbba
Author: Kim Woelders <k...@woelders.dk>
AuthorDate: Tue May 10 15:17:12 2022 +0200

    JPEG loader: Use mmap'ed file access
    
    Doesn't seem to affect speed much.
---
 src/modules/loaders/loader_jpeg.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/src/modules/loaders/loader_jpeg.c b/src/modules/loaders/loader_jpeg.c
index af43523..e0abf1f 100644
--- a/src/modules/loaders/loader_jpeg.c
+++ b/src/modules/loaders/loader_jpeg.c
@@ -65,6 +65,7 @@ int
 load2(ImlibImage * im, int load_data)
 {
    int                 w, h, rc;
+   void               *fdata;
    struct jpeg_decompress_struct jds;
    ImLib_JPEG_data     jdata;
    uint8_t            *ptr, *line[16];
@@ -72,15 +73,19 @@ load2(ImlibImage * im, int load_data)
    int                 x, y, l, scans, inc;
    ExifInfo            ei = { 0 };
 
+   rc = LOAD_FAIL;
+
+   fdata = mmap(NULL, im->fsize, PROT_READ, MAP_SHARED, fileno(im->fp), 0);
+   if (fdata == MAP_FAILED)
+      return rc;
+
    /* set up error handling */
    jds.err = _jdata_init(&jdata);
    if (sigsetjmp(jdata.setjmp_buffer, 1))
       QUIT_WITH_RC(LOAD_FAIL);
 
-   rc = LOAD_FAIL;
-
    jpeg_create_decompress(&jds);
-   jpeg_stdio_src(&jds, im->fp);
+   jpeg_mem_src(&jds, fdata, im->fsize);
    jpeg_save_markers(&jds, JPEG_APP0 + 1, 256);
    jpeg_read_header(&jds, TRUE);
 
@@ -243,6 +248,7 @@ load2(ImlibImage * im, int load_data)
  quit:
    jpeg_destroy_decompress(&jds);
    free(jdata.data);
+   munmap(fdata, im->fsize);
 
    return rc;
 }


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