removed errant TODOs, reconsidered error handling

src/Canvas.cc

@@ -308,19 +308,11 @@ Canvas::StreamJPEGSync(const Arguments &args) {
   closure_t closure;
   closure.fn = Handle<Function>::Cast(args[2]);
 
-  /*
-    TODO: tie jpeg_error_mgr into the error callback
-  */
   TryCatch try_catch;
-  cairo_status_t status = write_to_jpeg_stream(canvas->surface(), args[0]->NumberValue(), args[1]->NumberValue(), &closure);
+  write_to_jpeg_stream(canvas->surface(), args[0]->NumberValue(), args[1]->NumberValue(), &closure);
 
   if (try_catch.HasCaught()) {
     return try_catch.ReThrow();
-  // TODO : figure out libjpeg error handling, use this
-  } else if (status) {
-    // error state
-    Local<Value> argv[1] = { Canvas::Error(status) };
-    closure.fn->Call(Context::GetCurrent()->Global(), 1, argv);
   }
   return Undefined();
 }

src/JPEGStream.h

@@ -8,6 +8,7 @@
 
 #include "Canvas.h"
 #include <jpeglib.h>
+#include <jerror.h>
 
 /* Expanded data destination object for closure output */
 /* inspired by IJG's jdatadst.c */
@@ -20,7 +21,7 @@ typedef struct {
 } closure_destination_mgr;
 
 void init_closure_destination(j_compress_ptr cinfo){
-  // I don't think we really have to do anything here ...
+  // we really don't have to do anything here
 }
 
 boolean empty_closure_output_buffer(j_compress_ptr cinfo){
@@ -85,7 +86,7 @@ void jpeg_closure_dest(j_compress_ptr cinfo, closure_t * closure, int bufsize){
   cinfo->dest->free_in_buffer = dest->bufsize;
 }
 
-cairo_status_t write_to_jpeg_stream(cairo_surface_t *surface, int bufsize, int quality, closure_t * closure){
+void write_to_jpeg_stream(cairo_surface_t *surface, int bufsize, int quality, closure_t * closure){
   /*
     libjs code adapted from the Cairo R graphics project:
     http://www.rforge.net/Cairo/
@@ -103,7 +104,6 @@ cairo_status_t write_to_jpeg_stream(cairo_surface_t *surface, int bufsize, int q
 	cinfo.image_width = w;
 	cinfo.image_height = h;
 	jpeg_set_defaults(&cinfo);
-  /* TODO: quality */
 	jpeg_set_quality(&cinfo, quality, (quality<25)?0:1);
   jpeg_closure_dest(&cinfo, closure, bufsize);
 
@@ -130,7 +130,6 @@ cairo_status_t write_to_jpeg_stream(cairo_surface_t *surface, int bufsize, int q
   free(dst);
 	jpeg_finish_compress(&cinfo);
 	jpeg_destroy_compress(&cinfo);
-  return CAIRO_STATUS_SUCCESS;
 }
 
 #endif