Fix T65691: GPencil Drawing long strokes turn invisible

There was a fixed limit to the number of points available in a buffer stroke.

Now, the array is expanded as needed using a predefined number of points for each expansion, instead to add one by one. This is done to reduce the number of times the memory allocation is required.

As part of the fix, some variables have been renamed to reflect better their use.

1 files changed, 1 insertions, 1 deletions

diff --git a/source/blender/draw/engines/gpencil/gpencil_engine.c b/source/blender/draw/engines/gpencil/gpencil_engine.c
index 5d7ec490fb6..16162645f3d 100644
--- a/source/blender/draw/engines/gpencil/gpencil_engine.c
+++ b/source/blender/draw/engines/gpencil/gpencil_engine.c
@@ -430,7 +430,7 @@ void GPENCIL_cache_init(void *vedata)
       /* need the original to avoid cow overhead while drawing */
       bGPdata *gpd_orig = (bGPdata *)DEG_get_original_id(&obact_gpd->id);
       if (((gpd_orig->runtime.sbuffer_sflag & GP_STROKE_ERASER) == 0) &&
-          (gpd_orig->runtime.sbuffer_size > 0) &&
+          (gpd_orig->runtime.sbuffer_used > 0) &&
           ((gpd_orig->flag & GP_DATA_STROKE_POLYGON) == 0) && !DRW_state_is_depth() &&
           (stl->storage->background_ready == true)) {
         stl->g_data->session_flag |= GP_DRW_PAINT_PAINTING;