protect jpegint.h references

dtool/Config.pp

@@ -474,6 +474,10 @@
 #define JPEG_LIBS jpeg
 #defer HAVE_JPEG $[libtest $[JPEG_LPATH],$[JPEG_LIBS]]
 
+// Some versions of libjpeg did not provide jpegint.h.  Redefine this
+// to empty if you lack this header file.
+#define PHAVE_JPEGINT_H 1
+
 // Is libpng installed, and where?
 #define PNG_IPATH
 #define PNG_LPATH

dtool/LocalSetup.pp

@@ -280,6 +280,7 @@ $[cdefine REPORT_OPENSSL_ERRORS]
 
 /* Define if we have libjpeg installed.  */
 $[cdefine HAVE_JPEG]
+$[cdefine PHAVE_JPEGINT_H]
 
 /* Define if we have libpng installed.  */
 $[cdefine HAVE_PNG]

makepanda/makepanda.py

@@ -1357,6 +1357,7 @@ DTOOL_CONFIG=[
     ("HAVE_ZLIB",                      'UNDEF',                  'UNDEF'),
     ("HAVE_PNG",                       'UNDEF',                  'UNDEF'),
     ("HAVE_JPEG",                      'UNDEF',                  'UNDEF'),
+    ("PHAVE_JPEGINT_H",                '1',                      '1'),
     ("HAVE_TIFF",                      'UNDEF',                  'UNDEF'),
     ("HAVE_SGI_RGB",                   '1',                      '1'),
     ("HAVE_TGA",                       '1',                      '1'),

panda/src/vision/Sources.pp

@@ -1,7 +1,7 @@
 #define OTHER_LIBS interrogatedb:c dconfig:c dtoolconfig:m \
                    dtoolutil:c dtoolbase:c dtool:m prc:c
 
-#define USE_PACKAGES opencv artoolkit
+#define USE_PACKAGES opencv artoolkit jpeg
 
 #define BUILDING_DLL BUILDING_VISION
 

panda/src/vision/webcamVideoCursorV4L.cxx

@@ -20,7 +20,7 @@
 #include <linux/videodev.h>
 #include <linux/videodev2.h>
 
-#ifdef HAVE_JPEG
+#ifdef SUPPORT_WEBCAM_VIDEO_JPEG
 extern "C" {
   #include <jpeglib.h>
   #include <jpegint.h>
@@ -59,7 +59,7 @@ INLINE static void yuyv_to_rgbargba(unsigned char *dest, const unsigned char *sr
   dest[7] = (unsigned char) -1;
 }
 
-#if defined(HAVE_JPEG) && !defined(CPPPARSER)
+#if defined(SUPPORT_WEBCAM_VIDEO_JPEG) && !defined(CPPPARSER)
 
 struct my_error_mgr {
   struct jpeg_error_mgr pub;
@@ -151,7 +151,7 @@ WebcamVideoCursorV4L(WebcamVideoV4L *src) : MovieVideoCursor(src) {
   _format->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
   pvector<uint32_t>::iterator it;
   for (it = src->_pformats.begin(); it != src->_pformats.end(); ++it) {
-#ifdef HAVE_JPEG
+#ifdef SUPPORT_WEBCAM_VIDEO_JPEG
     if (*it == V4L2_PIX_FMT_MJPEG) {
       _format->fmt.pix.pixelformat = *it;
       break;
@@ -238,7 +238,7 @@ WebcamVideoCursorV4L(WebcamVideoV4L *src) : MovieVideoCursor(src) {
     vision_cat.error() << "Failed to stream from buffer!\n";
   }
 
-#ifdef HAVE_JPEG
+#ifdef SUPPORT_WEBCAM_VIDEO_JPEG
   // Initialize the JPEG library, if necessary
   if (_format->fmt.pix.pixelformat == V4L2_PIX_FMT_MJPEG) {
     _cinfo = (struct jpeg_decompress_struct *) malloc(sizeof(struct jpeg_decompress_struct));
@@ -265,7 +265,7 @@ WebcamVideoCursorV4L(WebcamVideoV4L *src) : MovieVideoCursor(src) {
 ////////////////////////////////////////////////////////////////////
 WebcamVideoCursorV4L::
 ~WebcamVideoCursorV4L() {
-#ifdef HAVE_JPEG
+#ifdef SUPPORT_WEBCAM_VIDEO_JPEG
   if (_cinfo != NULL) {
     jpeg_destroy_decompress(_cinfo);
     free(_cinfo);
@@ -316,7 +316,7 @@ fetch_into_buffer(double time, unsigned char *block, bool bgra) {
   unsigned char *buf = (unsigned char *) _buffers[vbuf.index];
 
   if (_format->fmt.pix.pixelformat == V4L2_PIX_FMT_MJPEG) {
-#ifdef HAVE_JPEG
+#ifdef SUPPORT_WEBCAM_VIDEO_JPEG
     nassertv(!bgra);
     struct my_error_mgr jerr;
     _cinfo->err = jpeg_std_error(&jerr.pub);

panda/src/vision/webcamVideoCursorV4L.h

@@ -22,7 +22,10 @@
 #include "webcamVideo.h"
 
 struct v4l2_format;
-#ifdef HAVE_JPEG
+
+// We can only decode a motion-jpeg stream if we have jpegint.h.
+#if defined(HAVE_JPEG) && defined(PHAVE_JPEGINT_H)
+#define SUPPORT_WEBCAM_VIDEO_JPEG 1
 struct jpeg_decompress_struct;
 #endif