the kernel-specific functions can fetch and use additional data it may need

Signed-off-by: Mattias Andrée <maandree@member.fsf.org>

1 files changed, 10 insertions, 4 deletions

diff --git a/src/kern-linux.c b/src/kern-linux.c
index 00930f1..7e31d1b 100644
--- a/src/kern-linux.c
+++ b/src/kern-linux.c
@@ -71,10 +71,13 @@ get_fbpath (int altpath, int fbno)
  * @param   fbpath  The path to the framebuffer device..
  * @param   width   Output parameter for the width of the image.
  * @param   height  Output parameter for the height of the image.
+ * @parma   data    Additional data to pass to `convert_fb_to_pnm`
+ *                  and `convert_fb_to_png`.
  * @return          Zero on success, -1 on error.
  */
 int
-measure (int fbno, char *restrict fbpath, long *restrict width, long *restrict height)
+measure (int fbno, char *restrict fbpath, long *restrict width,
+	 long *restrict height, void **restrict data)
 {
   static char buf[sizeof (SYSDIR "/class/graphics/fb/virtual_size") + 3 * sizeof(int)];
   /* The string "/class/graphics/fb/virtual_size" is large enought for the call (*) "*/
@@ -126,11 +129,12 @@ measure (int fbno, char *restrict fbpath, long *restrict width, long *restrict h
  *                      (a whole number of pixels where available,)
  *                      otherwise, set to the number of bytes a
  *                      pixel is encoded.
+ * @param   data        Data from `measure`.
  * @return              Zero on success, -1 on error.
  */
 int
-convert_fb_to_pnm (FILE *restrict file, const char *restrict buf,
-		   size_t n, size_t *restrict adjustment)
+convert_fb_to_pnm (FILE *restrict file, const char *restrict buf, size_t n,
+		   size_t *restrict adjustment, void *restrict data)
 {
   const uint32_t *restrict pixel;
   int r, g, b;
@@ -169,10 +173,12 @@ convert_fb_to_pnm (FILE *restrict file, const char *restrict buf,
  *                      pixel is encoded.
  * @param   state       Use this to keep track of where in the you
  *                      stopped. It will be 0 on the first call.
+ * @param   data        Data from `measure`.
  * @return              Zero on success, -1 on error.
  */
 int convert_fb_to_png (png_struct *pngbuf, png_byte *restrict pixbuf, const char *restrict buf,
-		       size_t n, long width3, size_t *restrict adjustment, long *restrict state)
+		       size_t n, long width3, size_t *restrict adjustment, long *restrict state,
+		       void *restrict data)
 {
   const uint32_t *restrict pixel;
   int r, g, b;