[PULL,2/9] Replacing CONFIG_VNC_PNG with CONFIG_PNG

diff --git a/meson_options.txt b/meson_options.txt
index 52b11cead44a..d85734f8e6bf 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -177,12 +177,12 @@  option('vde', type : 'feature', value : 'auto',
        description: 'vde network backend support')
 option('virglrenderer', type : 'feature', value : 'auto',
        description: 'virgl rendering support')
+option('png', type : 'feature', value : 'auto',
+       description: 'PNG support with libpng')
 option('vnc', type : 'feature', value : 'auto',
        description: 'VNC server')
 option('vnc_jpeg', type : 'feature', value : 'auto',
        description: 'JPEG lossy compression for VNC server')
-option('vnc_png', type : 'feature', value : 'auto',
-       description: 'PNG compression for VNC server')
 option('vnc_sasl', type : 'feature', value : 'auto',
        description: 'SASL authentication for VNC server')
 option('vte', type : 'feature', value : 'auto',
diff --git a/ui/vnc.h b/ui/vnc.h
index a7149831f906..a60fb13115c9 100644
--- a/ui/vnc.h
+++ b/ui/vnc.h
@@ -201,7 +201,7 @@  typedef struct VncTight {
 #ifdef CONFIG_VNC_JPEG
     Buffer jpeg;
 #endif
-#ifdef CONFIG_VNC_PNG
+#ifdef CONFIG_PNG
     Buffer png;
 #endif
     int levels[4];
diff --git a/ui/vnc-enc-tight.c b/ui/vnc-enc-tight.c
index 5a4b8a4fc0f6..09200d71b8cf 100644
--- a/ui/vnc-enc-tight.c
+++ b/ui/vnc-enc-tight.c
@@ -32,7 +32,7 @@ 
    INT32 definitions between jmorecfg.h (included by jpeglib.h) and
    Win32 basetsd.h (included by windows.h). */
 
-#ifdef CONFIG_VNC_PNG
+#ifdef CONFIG_PNG
 /* The following define is needed by pngconf.h. Otherwise it won't compile,
    because setjmp.h was already included by osdep.h. */
 #define PNG_SKIP_SETJMP_CHECK
@@ -95,7 +95,7 @@  static const struct {
 };
 #endif
 
-#ifdef CONFIG_VNC_PNG
+#ifdef CONFIG_PNG
 static const struct {
     int png_zlib_level, png_filters;
 } tight_png_conf[] = {
@@ -919,7 +919,7 @@  static int send_full_color_rect(VncState *vs, int x, int y, int w, int h)
     int stream = 0;
     ssize_t bytes;
 
-#ifdef CONFIG_VNC_PNG
+#ifdef CONFIG_PNG
     if (tight_can_send_png_rect(vs, w, h)) {
         return send_png_rect(vs, x, y, w, h, NULL);
     }
@@ -966,7 +966,7 @@  static int send_mono_rect(VncState *vs, int x, int y,
     int stream = 1;
     int level = tight_conf[vs->tight->compression].mono_zlib_level;
 
-#ifdef CONFIG_VNC_PNG
+#ifdef CONFIG_PNG
     if (tight_can_send_png_rect(vs, w, h)) {
         int ret;
         int bpp = vs->client_pf.bytes_per_pixel * 8;
@@ -1020,7 +1020,7 @@  static int send_mono_rect(VncState *vs, int x, int y,
 struct palette_cb_priv {
     VncState *vs;
     uint8_t *header;
-#ifdef CONFIG_VNC_PNG
+#ifdef CONFIG_PNG
     png_colorp png_palette;
 #endif
 };
@@ -1082,7 +1082,7 @@  static int send_palette_rect(VncState *vs, int x, int y,
     int colors;
     ssize_t bytes;
 
-#ifdef CONFIG_VNC_PNG
+#ifdef CONFIG_PNG
     if (tight_can_send_png_rect(vs, w, h)) {
         return send_png_rect(vs, x, y, w, h, palette);
     }
@@ -1233,7 +1233,7 @@  static int send_jpeg_rect(VncState *vs, int x, int y, int w, int h, int quality)
 /*
  * PNG compression stuff.
  */
-#ifdef CONFIG_VNC_PNG
+#ifdef CONFIG_PNG
 static void write_png_palette(int idx, uint32_t pix, void *opaque)
 {
     struct palette_cb_priv *priv = opaque;
@@ -1379,7 +1379,7 @@  static int send_png_rect(VncState *vs, int x, int y, int w, int h,
     buffer_reset(&vs->tight->png);
     return 1;
 }
-#endif /* CONFIG_VNC_PNG */
+#endif /* CONFIG_PNG */
 
 static void vnc_tight_start(VncState *vs)
 {
@@ -1706,7 +1706,7 @@  void vnc_tight_clear(VncState *vs)
 #ifdef CONFIG_VNC_JPEG
     buffer_free(&vs->tight->jpeg);
 #endif
-#ifdef CONFIG_VNC_PNG
+#ifdef CONFIG_PNG
     buffer_free(&vs->tight->png);
 #endif
 }
diff --git a/ui/vnc.c b/ui/vnc.c
index badf1d7664fe..7d55e1500a42 100644
--- a/ui/vnc.c
+++ b/ui/vnc.c
@@ -2165,7 +2165,7 @@  static void set_encodings(VncState *vs, int32_t *encodings, size_t n_encodings)
             vs->features |= VNC_FEATURE_TIGHT_MASK;
             vs->vnc_encoding = enc;
             break;
-#ifdef CONFIG_VNC_PNG
+#ifdef CONFIG_PNG
         case VNC_ENCODING_TIGHT_PNG:
             vs->features |= VNC_FEATURE_TIGHT_PNG_MASK;
             vs->vnc_encoding = enc;
@@ -3256,7 +3256,7 @@  static void vnc_connect(VncDisplay *vd, QIOChannelSocket *sioc,
 #ifdef CONFIG_VNC_JPEG
     buffer_init(&vs->tight->jpeg,     "vnc-tight-jpeg/%p", sioc);
 #endif
-#ifdef CONFIG_VNC_PNG
+#ifdef CONFIG_PNG
     buffer_init(&vs->tight->png,      "vnc-tight-png/%p", sioc);
 #endif
     buffer_init(&vs->zlib.zlib,      "vnc-zlib/%p", sioc);
diff --git a/meson.build b/meson.build
index d083c6b7bf90..0c38e491f488 100644
--- a/meson.build
+++ b/meson.build
@@ -1115,14 +1115,16 @@  if gtkx11.found()
   x11 = dependency('x11', method: 'pkg-config', required: gtkx11.found(),
                    kwargs: static_kwargs)
 endif
-vnc = not_found
 png = not_found
+if get_option('png').allowed() and have_system
+   png = dependency('libpng', required: get_option('png'),
+                    method: 'pkg-config', kwargs: static_kwargs)
+endif
+vnc = not_found
 jpeg = not_found
 sasl = not_found
 if get_option('vnc').allowed() and have_system
   vnc = declare_dependency() # dummy dependency
-  png = dependency('libpng', required: get_option('vnc_png'),
-                   method: 'pkg-config', kwargs: static_kwargs)
   jpeg = dependency('libjpeg', required: get_option('vnc_jpeg'),
                     method: 'pkg-config', kwargs: static_kwargs)
   sasl = cc.find_library('sasl2', has_headers: ['sasl/sasl.h'],
@@ -1554,9 +1556,9 @@  config_host_data.set('CONFIG_TPM', have_tpm)
 config_host_data.set('CONFIG_USB_LIBUSB', libusb.found())
 config_host_data.set('CONFIG_VDE', vde.found())
 config_host_data.set('CONFIG_VHOST_USER_BLK_SERVER', have_vhost_user_blk_server)
+config_host_data.set('CONFIG_PNG', png.found())
 config_host_data.set('CONFIG_VNC', vnc.found())
 config_host_data.set('CONFIG_VNC_JPEG', jpeg.found())
-config_host_data.set('CONFIG_VNC_PNG', png.found())
 config_host_data.set('CONFIG_VNC_SASL', sasl.found())
 config_host_data.set('CONFIG_VIRTFS', have_virtfs)
 config_host_data.set('CONFIG_VTE', vte.found())
@@ -3667,11 +3669,11 @@  summary_info += {'curses support':    curses}
 summary_info += {'virgl support':     virgl}
 summary_info += {'curl support':      curl}
 summary_info += {'Multipath support': mpathpersist}
+summary_info += {'PNG support':       png}
 summary_info += {'VNC support':       vnc}
 if vnc.found()
   summary_info += {'VNC SASL support':  sasl}
   summary_info += {'VNC JPEG support':  jpeg}
-  summary_info += {'VNC PNG support':   png}
 endif
 if targetos not in ['darwin', 'haiku', 'windows']
   summary_info += {'OSS support':     oss}
diff --git a/scripts/ci/org.centos/stream/8/x86_64/configure b/scripts/ci/org.centos/stream/8/x86_64/configure
index 9850dd44444a..08225ee514df 100755
--- a/scripts/ci/org.centos/stream/8/x86_64/configure
+++ b/scripts/ci/org.centos/stream/8/x86_64/configure
@@ -142,7 +142,7 @@ 
 --disable-virtiofsd \
 --disable-vnc \
 --disable-vnc-jpeg \
---disable-vnc-png \
+--disable-png \
 --disable-vnc-sasl \
 --disable-vte \
 --disable-vvfat \
@@ -200,7 +200,7 @@ 
 --enable-vhost-vdpa \
 --enable-vhost-vsock \
 --enable-vnc \
---enable-vnc-png \
+--enable-png \
 --enable-vnc-sasl \
 --enable-werror \
 --enable-xkbcommon
diff --git a/scripts/coverity-scan/run-coverity-scan b/scripts/coverity-scan/run-coverity-scan
index 181bdcb26382..129672c86fa1 100755
--- a/scripts/coverity-scan/run-coverity-scan
+++ b/scripts/coverity-scan/run-coverity-scan
@@ -394,7 +394,7 @@  echo "Configuring..."
     --enable-opengl --enable-vte --enable-gnutls \
     --enable-nettle --enable-curses --enable-curl \
     --audio-drv-list=oss,alsa,sdl,pa --enable-virtfs \
-    --enable-vnc --enable-vnc-sasl --enable-vnc-jpeg --enable-vnc-png \
+    --enable-vnc --enable-vnc-sasl --enable-vnc-jpeg --enable-png \
     --enable-xen --enable-brlapi \
     --enable-linux-aio --enable-attr \
     --enable-cap-ng --enable-trace-backends=log --enable-spice --enable-rbd \
diff --git a/scripts/meson-buildoptions.sh b/scripts/meson-buildoptions.sh
index 1e26f4571ef4..ef0dcd4a7768 100644
--- a/scripts/meson-buildoptions.sh
+++ b/scripts/meson-buildoptions.sh
@@ -94,6 +94,7 @@  meson_options_help() {
   printf "%s\n" '  oss             OSS sound support'
   printf "%s\n" '  pa              PulseAudio sound support'
   printf "%s\n" '  parallels       parallels image format support'
+  printf "%s\n" '  png             PNG support with libpng'
   printf "%s\n" '  qcow1           qcow1 image format support'
   printf "%s\n" '  qed             qed image format support'
   printf "%s\n" '  qga-vss         build QGA VSS support (broken with MinGW)'
@@ -123,7 +124,6 @@  meson_options_help() {
   printf "%s\n" '  virtiofsd       build virtiofs daemon (virtiofsd)'
   printf "%s\n" '  vnc             VNC server'
   printf "%s\n" '  vnc-jpeg        JPEG lossy compression for VNC server'
-  printf "%s\n" '  vnc-png         PNG compression for VNC server'
   printf "%s\n" '  vnc-sasl        SASL authentication for VNC server'
   printf "%s\n" '  vte             vte support for the gtk UI'
   printf "%s\n" '  vvfat           vvfat image format support'
@@ -277,6 +277,8 @@  _meson_option_parse() {
     --disable-pa) printf "%s" -Dpa=disabled ;;
     --enable-parallels) printf "%s" -Dparallels=enabled ;;
     --disable-parallels) printf "%s" -Dparallels=disabled ;;
+    --enable-png) printf "%s" -Dpng=enabled ;;
+    --disable-png) printf "%s" -Dpng=disabled ;;
     --enable-profiler) printf "%s" -Dprofiler=true ;;
     --disable-profiler) printf "%s" -Dprofiler=false ;;
     --enable-qcow1) printf "%s" -Dqcow1=enabled ;;
@@ -347,8 +349,6 @@  _meson_option_parse() {
     --disable-vnc) printf "%s" -Dvnc=disabled ;;
     --enable-vnc-jpeg) printf "%s" -Dvnc_jpeg=enabled ;;
     --disable-vnc-jpeg) printf "%s" -Dvnc_jpeg=disabled ;;
-    --enable-vnc-png) printf "%s" -Dvnc_png=enabled ;;
-    --disable-vnc-png) printf "%s" -Dvnc_png=disabled ;;
     --enable-vnc-sasl) printf "%s" -Dvnc_sasl=enabled ;;
     --disable-vnc-sasl) printf "%s" -Dvnc_sasl=disabled ;;
     --enable-vte) printf "%s" -Dvte=enabled ;;