render api utility function to initialize a render layer from an image rather then loading through python.

	lay = result.layers[0]
	lay.rect_from_file("somefile.png", part.x, part.y)

If the source image is bigger then the render layer x/y offsets can be used to choose the part of the image use.

2 files changed, 45 insertions, 0 deletions

diff --git a/source/blender/render/extern/include/RE_pipeline.h b/source/blender/render/extern/include/RE_pipeline.h
index d96054f5a76..2df3a0a4f8b 100644
--- a/source/blender/render/extern/include/RE_pipeline.h
+++ b/source/blender/render/extern/include/RE_pipeline.h
@@ -39,6 +39,7 @@ struct bNodeTree;
 struct Image;
 struct NodeBlurData;
 struct Object;
+struct ReportList;
 struct RenderData;
 struct RenderEngine;
 struct RenderEngineType;
@@ -265,6 +266,8 @@ typedef struct RenderEngine {
 	ListBase fullresult;
 } RenderEngine;
 
+void RE_layer_rect_from_file(RenderLayer *layer, struct ReportList *reports, char *filename, int x, int y);
+
 struct RenderResult *RE_engine_begin_result(RenderEngine *engine, int x, int y, int w, int h);
 void RE_engine_update_result(RenderEngine *engine, struct RenderResult *result);
 void RE_engine_end_result(RenderEngine *engine, struct RenderResult *result);
diff --git a/source/blender/render/intern/source/pipeline.c b/source/blender/render/intern/source/pipeline.c
index 3e50ea92846..4a84b1e78b6 100644
--- a/source/blender/render/intern/source/pipeline.c
+++ b/source/blender/render/intern/source/pipeline.c
@@ -45,6 +45,7 @@
 #include "BKE_main.h"
 #include "BKE_node.h"
 #include "BKE_object.h"
+#include "BKE_report.h"
 #include "BKE_scene.h"
 #include "BKE_writeavi.h"	/* <------ should be replaced once with generic movie module */
 #include "BKE_pointcache.h"
@@ -2876,6 +2877,47 @@ void RE_engine_update_stats(RenderEngine *engine, char *stats, char *info)
 	re->i.statstr= NULL;
 }
 
+/* loads in image into a result, size must match
+ * x/y offsets are only used on a partial copy when dimensions dont match */
+void RE_layer_rect_from_file(RenderLayer *layer, ReportList *reports, char *filename, int x, int y)
+{
+	ImBuf *ibuf = IMB_loadiffname(filename, IB_rect);
+
+	if(ibuf  && (ibuf->rect || ibuf->rect_float)) {
+		if (ibuf->x == layer->rectx && ibuf->y == layer->recty) {
+			if(ibuf->rect_float==NULL)
+				IMB_float_from_rect(ibuf);
+
+			memcpy(layer->rectf, ibuf->rect_float, sizeof(float)*4*layer->rectx*layer->recty);
+		} else {
+			if ((ibuf->x - x >= layer->rectx) && (ibuf->y - y >= layer->recty)) {
+				ImBuf *ibuf_clip;
+
+				if(ibuf->rect_float==NULL)
+					IMB_float_from_rect(ibuf);
+
+				ibuf_clip = IMB_allocImBuf(layer->rectx, layer->recty, 32, IB_rectfloat, 0);
+				if(ibuf_clip) {
+					IMB_rectcpy(ibuf_clip, ibuf, 0,0, x,y, layer->rectx, layer->recty);
+
+					memcpy(layer->rectf, ibuf_clip->rect_float, sizeof(float)*4*layer->rectx*layer->recty);
+					IMB_freeImBuf(ibuf_clip);
+				}
+				else {
+					BKE_reportf(reports, RPT_ERROR, "RE_result_rect_from_file: failed to allocate clip buffer '%s'\n", filename);
+				}
+			}
+			else {
+				BKE_reportf(reports, RPT_ERROR, "RE_result_rect_from_file: incorrect dimensions for partial copy '%s'\n", filename);
+			}
+		}
+
+		IMB_freeImBuf(ibuf);
+	}
+	else {
+		BKE_reportf(reports, RPT_ERROR, "RE_result_rect_from_file: failed to load '%s'\n", filename);
+	}
+}
 static void external_render_3d(Render *re, RenderEngineType *type)
 {
 	RenderEngine engine;