thumbnail passepartout effect, distinguishes blend files from images.

1 files changed, 61 insertions, 1 deletions

diff --git a/source/blender/windowmanager/intern/wm_files.c b/source/blender/windowmanager/intern/wm_files.c
index a6e59cde402..19f8ceda050 100644
--- a/source/blender/windowmanager/intern/wm_files.c
+++ b/source/blender/windowmanager/intern/wm_files.c
@@ -492,6 +492,64 @@ static void do_history(char *name, ReportList *reports)
 }
 
 /* writes a thumbnail for a blendfile */
+static void writeThumb_overlay(int *thumb, int width, int height, float aspect)
+{
+	unsigned char *px= (unsigned char *)thumb;
+	int margin_l = 3;
+	int margin_b = 3;
+	int margin_r = width - 3;
+	int margin_t = height - 3;
+
+	printf("%f\n", aspect);
+
+	if(aspect < 1.0f) {
+		margin_l= (int)((width - ((float)width * aspect)) / 2.0f);
+		margin_l += 2;
+		CLAMP(margin_l, 2, (width/2));
+		margin_r = width - margin_l;
+	}
+	else if (aspect > 1.0f) {
+		margin_b= (int)((height - ((float)height / aspect)) / 2.0f);
+		margin_b += 2;
+		CLAMP(margin_b, 2, (height/2));
+		margin_t = height - margin_b;
+	}
+
+	{	
+		int x, y;
+		int hline, vline;
+		float alpha;
+		int stride_x= (margin_r - margin_l) - 2;
+		
+		for(y=0; y < height; y++) {
+			float fac= (float)y / (float)height;
+			alpha= (0.2f * fac) + (1.0f * (1.0f - fac));
+			for(x=0; x < width; x++, px+=4) {
+				if((x > margin_l && x < margin_r) && (y > margin_b && y < margin_t)) {
+					/* interior. skip */
+					x  += stride_x;
+					px += stride_x * 4;
+				} else if(	(hline=(((x == margin_l || x == margin_r)) && y >= margin_b && y <= margin_t)) ||
+							(vline=(((y == margin_b || y == margin_t)) && x >= margin_l && x <= margin_r))
+				) {
+					/* dashed line */
+					if((hline && y % 2) || (vline && x % 2)) {
+						px[0]= px[1]= px[2]= 0;
+						px[3] = 255;
+					}
+				}
+				else {
+					/* outside, fill in alpha, like passepartout */
+					px[0] *= 0.5f;
+					px[1] *= 0.5f;
+					px[2] *= 0.5f;
+					px[3] = (px[3] * 0.5f) + (128 * alpha);
+				}
+			}
+		}
+	}
+}
+
 static void writeThumb(const char *path, Scene *scene, int **thumb_pt)
 {
 	/* will be scaled down, but gives some nice oversampling */
@@ -507,7 +565,8 @@ static void writeThumb(const char *path, Scene *scene, int **thumb_pt)
 	ibuf= ED_view3d_draw_offscreen_imbuf_simple(scene, BLEN_THUMB_SIZE * 2, BLEN_THUMB_SIZE * 2, OB_SOLID);
 	
 	if(ibuf) {		
-		
+		float aspect= (scene->r.xsch*scene->r.xasp) / (scene->r.ysch*scene->r.yasp);
+
 		/* dirty oversampling */
 		IMB_scaleImBuf(ibuf, BLEN_THUMB_SIZE, BLEN_THUMB_SIZE);
 		
@@ -518,6 +577,7 @@ static void writeThumb(const char *path, Scene *scene, int **thumb_pt)
 		thumb[1] = BLEN_THUMB_SIZE;
 
 		memcpy(thumb + 2, ibuf->rect, BLEN_THUMB_SIZE * BLEN_THUMB_SIZE * sizeof(int));
+		writeThumb_overlay(thumb + 2, BLEN_THUMB_SIZE, BLEN_THUMB_SIZE, aspect);
 		
 		/* the image is scaled here */
 		ibuf= IMB_thumb_create(path, THB_NORMAL, THB_SOURCE_BLEND, ibuf);