fix for [#8359] Sequencer image preview: HOME hotkey zooming at output res, not at "full view"

also made image and sequencer account for aspect ratio and added numpad 1,2,4,8 keys for zooming.

2 files changed, 6 insertions, 1 deletions

diff --git a/source/blender/blenlib/BLI_arithb.h b/source/blender/blenlib/BLI_arithb.h
index 5b4e380f88e..9ed23bc32b6 100644
--- a/source/blender/blenlib/BLI_arithb.h
+++ b/source/blender/blenlib/BLI_arithb.h
@@ -96,7 +96,7 @@ float CalcNormFloat4(float *v1, float *v2, float *v3, float *v4, float *n);
 void CalcNormLong(int *v1, int *v2, int *v3, float *n);
 /* CalcNormShort: is ook uitprodukt - (translates as 'is also out/cross product') */
 void CalcNormShort(short *v1, short *v2, short *v3, float *n);
-
+float power_of_2(float val);
 
 /**
  * @section Euler conversion routines
diff --git a/source/blender/blenlib/intern/arithb.c b/source/blender/blenlib/intern/arithb.c
index 19a8d4f5152..48a149f4b3a 100644
--- a/source/blender/blenlib/intern/arithb.c
+++ b/source/blender/blenlib/intern/arithb.c
@@ -4345,3 +4345,8 @@ void tangent_from_uv(float *uv1, float *uv2, float *uv3, float *co1, float *co2,
 	if ((ct[0]*n[0] + ct[1]*n[1] + ct[2]*n[2]) < 0.0f)
 		VecMulf(tang, -1.0f);
 }
+
+/* used for zoom values*/
+float power_of_2(float val) {
+	return pow(2, ceil(log(val) / log(2)));
+}