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-rw-r--r--ui/vnc-enc-tight.c19
1 files changed, 18 insertions, 1 deletions
diff --git a/ui/vnc-enc-tight.c b/ui/vnc-enc-tight.c
index cc57c26796..e627e00dff 100644
--- a/ui/vnc-enc-tight.c
+++ b/ui/vnc-enc-tight.c
@@ -73,6 +73,21 @@ static int tight_send_framebuffer_update(VncState *vs, int x, int y,
int w, int h);
#ifdef CONFIG_VNC_PNG
+static const struct {
+ int png_zlib_level, png_filters;
+} tight_png_conf[] = {
+ { 0, PNG_NO_FILTERS },
+ { 1, PNG_NO_FILTERS },
+ { 2, PNG_NO_FILTERS },
+ { 3, PNG_NO_FILTERS },
+ { 4, PNG_NO_FILTERS },
+ { 5, PNG_ALL_FILTERS },
+ { 6, PNG_ALL_FILTERS },
+ { 7, PNG_ALL_FILTERS },
+ { 8, PNG_ALL_FILTERS },
+ { 9, PNG_ALL_FILTERS },
+};
+
static int send_png_rect(VncState *vs, int x, int y, int w, int h,
QDict *palette);
@@ -1425,7 +1440,8 @@ static int send_png_rect(VncState *vs, int x, int y, int w, int h,
png_infop info_ptr;
png_colorp png_palette = NULL;
size_t offset;
- int level = tight_conf[vs->tight_compression].raw_zlib_level;
+ int level = tight_png_conf[vs->tight_compression].png_zlib_level;
+ int filters = tight_png_conf[vs->tight_compression].png_filters;
uint8_t *buf;
int dy;
@@ -1444,6 +1460,7 @@ static int send_png_rect(VncState *vs, int x, int y, int w, int h,
png_set_write_fn(png_ptr, (void *) vs, png_write_data, png_flush_data);
png_set_compression_level(png_ptr, level);
+ png_set_filter(png_ptr, PNG_FILTER_TYPE_DEFAULT, filters);
if (palette) {
color_type = PNG_COLOR_TYPE_PALETTE;