Split image decode and scaling work into bands for large images

Images larger than will fit in a typical L2 cache that need scaling
are now chopped up and processed in bands. Speeds up McCue.pdf
overall by 1/3. Actual decoding of stream is still done in one
chunk, which now has the highest overhead.

1 files changed, 4 insertions, 0 deletions

diff --git a/include/fitz/base_pixmap.h b/include/fitz/base_pixmap.h
index 9a0f2b43..ca8fa883 100644
--- a/include/fitz/base_pixmap.h
+++ b/include/fitz/base_pixmap.h
@@ -24,3 +24,7 @@ void fz_droppixmap(fz_pixmap *map);
 
 fz_error *fz_scalepixmap(fz_pixmap **dstp, fz_pixmap *src, int xdenom, int ydenom);
 
+/* needed for tiled rendering */
+fz_error *fz_newscaledpixmap(fz_pixmap **dstp, int w, int h, int n, int xdenom, int ydenom);
+fz_error *fz_scalepixmaptile(fz_pixmap *dstp, int xoffs, int yoffs,
+			     fz_pixmap *tile, int xdenom, int ydenom);