catch exception and report an error when failing to write exr files - was crashing with debug builds.

source/blender/editors/space_image/image_ops.c

@@ -1069,7 +1069,7 @@ static void save_image_doit(bContext *C, SpaceImage *sima, wmOperator *op, SaveI
 			Scene *scene= CTX_data_scene(C);
 			RenderResult *rr= BKE_image_acquire_renderresult(scene, ima);
 			if(rr) {
-				RE_WriteRenderResult(rr, simopts->filepath, simopts->quality);
+				RE_WriteRenderResult(op->reports, rr, simopts->filepath, simopts->quality);
 				ok= TRUE;
 			}
 			else {

source/blender/imbuf/intern/openexr/openexr_api.cpp

@@ -487,7 +487,7 @@ void IMB_exr_add_channel(void *handle, const char *layname, const char *passname
 }
 
 /* only used for writing temp. render results (not image files) */
-void IMB_exr_begin_write(void *handle, const char *filename, int width, int height, int compress)
+int IMB_exr_begin_write(void *handle, const char *filename, int width, int height, int compress)
 {
 	ExrHandle *data= (ExrHandle *)handle;
 	Header header (width, height);
@@ -505,8 +505,17 @@ void IMB_exr_begin_write(void *handle, const char *filename, int width, int heig
 	
 	header.insert ("BlenderMultiChannel", StringAttribute ("Blender V2.55.1 and newer"));
 
+	/* avoid crash/abort when we dont have permission to write here */
+	try {
 		data->ofile = new OutputFile(filename, header);
 	}
+	catch (const std::exception &exc) {
+		std::cerr << "IMB_exr_begin_write: ERROR: " << exc.what() << std::endl;
+		data->ofile = NULL;
+	}
+
+	return (data->ofile != NULL);
+}
 
 void IMB_exrtile_begin_write(void *handle, const char *filename, int mipmap, int width, int height, int tilex, int tiley)
 {

source/blender/imbuf/intern/openexr/openexr_multi.h

@@ -50,7 +50,7 @@ void *	IMB_exr_get_handle			(void);
 void	IMB_exr_add_channel			(void *handle, const char *layname, const char *passname, int xstride, int ystride, float *rect);
 
 int		IMB_exr_begin_read			(void *handle, const char *filename, int *width, int *height);
-void	IMB_exr_begin_write			(void *handle, const char *filename, int width, int height, int compress);
+int		IMB_exr_begin_write			(void *handle, const char *filename, int width, int height, int compress);
 void	IMB_exrtile_begin_write		(void *handle, const char *filename, int mipmap, int width, int height, int tilex, int tiley);
 
 void	IMB_exr_set_channel			(void *handle, const char *layname, const char *passname, int xstride, int ystride, float *rect);
@@ -75,7 +75,7 @@ void *	IMB_exr_get_handle			(void) {return NULL;}
 void	IMB_exr_add_channel			(void *handle, const char *layname, const char *channame, int xstride, int ystride, float *rect) {  (void)handle; (void)layname; (void)channame; (void)xstride; (void)ystride; (void)rect; }
 
 int		IMB_exr_begin_read			(void *handle, const char *filename, int *width, int *height) { (void)handle; (void)filename; (void)width; (void)height; return 0;}
-void	IMB_exr_begin_write			(void *handle, const char *filename, int width, int height, int compress) { (void)handle; (void)filename; (void)width; (void)height; (void)compress; }
+int		IMB_exr_begin_write			(void *handle, const char *filename, int width, int height, int compress) { (void)handle; (void)filename; (void)width; (void)height; (void)compress; return 0;}
 void	IMB_exrtile_begin_write		(void *handle, const char *filename, int mipmap, int width, int height, int tilex, int tiley) { (void)handle; (void)filename; (void)mipmap; (void)width; (void)height; (void)tilex; (void)tiley; }
 
 void	IMB_exr_set_channel			(void *handle, char *layname, const char *channame, int xstride, int ystride, float *rect) { (void)handle; (void)layname; (void)channame; (void)xstride; (void)ystride; (void)rect; }

source/blender/imbuf/intern/writeimage.c

@@ -55,7 +55,6 @@ short IMB_saveiff(struct ImBuf *ibuf, const char *name, int flags)
 				if(ibuf->rect==NULL && ibuf->rect_float)
 					IMB_rect_from_float(ibuf);
 			}
-			/* TODO. have const char for image write funcs */
 			return type->save(ibuf, name, flags);
 		}
 	}

source/blender/render/extern/include/RE_pipeline.h

@@ -227,8 +227,8 @@ void RE_SetReports(struct Render *re, struct ReportList *reports);
 /* main preview render call */
 void RE_PreviewRender(struct Render *re, struct Main *bmain, struct Scene *scene);
 
-void RE_ReadRenderResult(struct Scene *scene, struct Scene *scenode);
-void RE_WriteRenderResult(RenderResult *rr, const char *filename, int compress);
+int RE_ReadRenderResult(struct Scene *scene, struct Scene *scenode);
+int RE_WriteRenderResult(struct ReportList *reports, RenderResult *rr, const char *filename, int compress);
 struct RenderResult *RE_MultilayerConvert(void *exrhandle, int rectx, int recty);
 
 extern const float default_envmap_layout[];

source/blender/render/intern/source/pipeline.c

@@ -824,11 +824,12 @@ static char *make_pass_name(RenderPass *rpass, int chan)
 
 /* filename already made absolute */
 /* called from within UI, saves both rendered result as a file-read result */
-void RE_WriteRenderResult(RenderResult *rr, const char *filename, int compress)
+int RE_WriteRenderResult(ReportList *reports, RenderResult *rr, const char *filename, int compress)
 {
 	RenderLayer *rl;
 	RenderPass *rpass;
 	void *exrhandle= IMB_exr_get_handle();
+	int success;
 
 	BLI_make_existing_file(filename);
 	
@@ -865,10 +866,19 @@ void RE_WriteRenderResult(RenderResult *rr, const char *filename, int compress)
 		}
 	}
 
-	IMB_exr_begin_write(exrhandle, filename, rr->rectx, rr->recty, compress);
-	
+	/* when the filename has no permissions, this can fail */
+	if(IMB_exr_begin_write(exrhandle, filename, rr->rectx, rr->recty, compress)) {
 		IMB_exr_write_channels(exrhandle);
+		success= TRUE;
+	}
+	else {
+		/* TODO, get the error from openexr's exception */
+		BKE_report(reports, RPT_ERROR, "Error Writing Render Result, see console");
+		success= FALSE;
+	}
 	IMB_exr_close(exrhandle);
+
+	return success;
 }
 
 /* callbacks for RE_MultilayerConvert */
@@ -992,9 +1002,10 @@ static int read_render_result_from_file(const char *filename, RenderResult *rr)
 }
 
 /* only for temp buffer files, makes exact copy of render result */
-static void read_render_result(Render *re, int sample)
+static int read_render_result(Render *re, int sample)
 {
 	char str[FILE_MAX];
+	int success;
 
 	BLI_rw_mutex_lock(&re->resultmutex, THREAD_LOCK_WRITE);
 
@@ -1004,10 +1015,18 @@ static void read_render_result(Render *re, int sample)
 	render_unique_exr_name(re, str, sample);
 	printf("read exr tmp file: %s\n", str);
 
-	if(!read_render_result_from_file(str, re->result))
+	if(read_render_result_from_file(str, re->result)) {
+		success= TRUE;
+	}
+	else {
 		printf("cannot read: %s\n", str);
+		success= FALSE;
+
+	}
 
 	BLI_rw_mutex_unlock(&re->resultmutex);
+
+	return success;
 }
 
 /* *************************************************** */
@@ -2981,7 +3000,7 @@ static int do_write_image_or_movie(Render *re, Scene *scene, bMovieHandle *mh, c
 		
 		if(re->r.imtype==R_MULTILAYER) {
 			if(re->result) {
-				RE_WriteRenderResult(re->result, name, scene->r.quality);
+				RE_WriteRenderResult(re->reports, re->result, name, scene->r.quality);
 				printf("Saved: %s", name);
 			}
 		}
@@ -3198,7 +3217,7 @@ void RE_PreviewRender(Render *re, Main *bmain, Scene *sce)
 /* note; repeated win/disprect calc... solve that nicer, also in compo */
 
 /* only the temp file! */
-void RE_ReadRenderResult(Scene *scene, Scene *scenode)
+int RE_ReadRenderResult(Scene *scene, Scene *scenode)
 {
 	Render *re;
 	int winx, winy;
@@ -3232,7 +3251,7 @@ void RE_ReadRenderResult(Scene *scene, Scene *scenode)
 	RE_InitState(re, NULL, &scene->r, NULL, winx, winy, &disprect);
 	re->scene= scene;
 	
-	read_render_result(re, 0);
+	return read_render_result(re, 0);
 }
 
 void RE_set_max_threads(int threads)