Fix T78136: Image editor - crash to desktop with changing the threshold for extract palette

Also fixed the same error in generate GPencil object from image.

The problem was the Render Result image hasn't  ibuf.

3 files changed, 11 insertions, 4 deletions

diff --git a/source/blender/blenkernel/intern/gpencil.c b/source/blender/blenkernel/intern/gpencil.c
index 4f1ede432ea..aa5803a5d5f 100644
--- a/source/blender/blenkernel/intern/gpencil.c
+++ b/source/blender/blenkernel/intern/gpencil.c
@@ -1813,7 +1813,7 @@ bool BKE_gpencil_from_image(SpaceImage *sima, bGPDframe *gpf, const float size,
 
   ibuf = BKE_image_acquire_ibuf(image, &iuser, &lock);
 
-  if (ibuf->rect) {
+  if (ibuf && ibuf->rect) {
     int img_x = ibuf->x;
     int img_y = ibuf->y;
 
diff --git a/source/blender/editors/gpencil/gpencil_convert.c b/source/blender/editors/gpencil/gpencil_convert.c
index f1b8ae61994..75249fbdd06 100644
--- a/source/blender/editors/gpencil/gpencil_convert.c
+++ b/source/blender/editors/gpencil/gpencil_convert.c
@@ -55,6 +55,7 @@
 #include "BKE_global.h"
 #include "BKE_gpencil.h"
 #include "BKE_gpencil_geom.h"
+#include "BKE_image.h"
 #include "BKE_layer.h"
 #include "BKE_main.h"
 #include "BKE_material.h"
@@ -1773,7 +1774,10 @@ static bool image_to_gpencil_poll(bContext *C)
 {
   SpaceLink *sl = CTX_wm_space_data(C);
   if ((sl != NULL) && (sl->spacetype == SPACE_IMAGE)) {
-    return true;
+    SpaceImage *sima = CTX_wm_space_image(C);
+    Image *image = sima->image;
+    ImageUser iuser = sima->iuser;
+    return BKE_image_has_ibuf(image, &iuser);
   }
 
   return false;
diff --git a/source/blender/editors/sculpt_paint/paint_ops.c b/source/blender/editors/sculpt_paint/paint_ops.c
index 0f54d5e0821..0f0af335481 100644
--- a/source/blender/editors/sculpt_paint/paint_ops.c
+++ b/source/blender/editors/sculpt_paint/paint_ops.c
@@ -304,7 +304,10 @@ static bool palette_extract_img_poll(bContext *C)
 {
   SpaceLink *sl = CTX_wm_space_data(C);
   if ((sl != NULL) && (sl->spacetype == SPACE_IMAGE)) {
-    return true;
+    SpaceImage *sima = CTX_wm_space_image(C);
+    Image *image = sima->image;
+    ImageUser iuser = sima->iuser;
+    return BKE_image_has_ibuf(image, &iuser);
   }
 
   return false;
@@ -326,7 +329,7 @@ static int palette_extract_img_exec(bContext *C, wmOperator *op)
 
   ibuf = BKE_image_acquire_ibuf(image, &iuser, &lock);
 
-  if (ibuf->rect) {
+  if (ibuf && ibuf->rect) {
     /* Extract all colors. */
     for (int row = 0; row < ibuf->y; row++) {
       for (int col = 0; col < ibuf->x; col++) {