thumbnail passepartout effect, distinguishes blend files from images.
authorCampbell Barton <ideasman42@gmail.com>
Sun, 30 May 2010 09:16:50 +0000 (09:16 +0000)
committerCampbell Barton <ideasman42@gmail.com>
Sun, 30 May 2010 09:16:50 +0000 (09:16 +0000)
source/blender/windowmanager/intern/wm_files.c

index a6e59cde4029dab857c5eddc241149f7faf9f23c..19f8ceda050441c7640d538a66c3ab8f7d54b427 100644 (file)
@@ -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);