From ba14bac9af51d5b8fd479d749345010609a80056 Mon Sep 17 00:00:00 2001
From: "Dr.Smile" <vabnick@gmail.com>
Date: Sat, 8 Dec 2018 21:03:37 +0300
Subject: bitmap: make ass_synth_blur() work on single bitmap

Now ass_synth_blur() blurs one bitmap only.
Higher level decisions (to blur or not to blur)
have moved outside of that function.
---
 libass/ass_bitmap.c | 86 +++++++++++++++++------------------------------------
 libass/ass_bitmap.h |  4 +--
 libass/ass_render.c |  5 ++--
 3 files changed, 32 insertions(+), 63 deletions(-)

(limited to 'libass')

diff --git a/libass/ass_bitmap.c b/libass/ass_bitmap.c
index b489d85..9ae8d7a 100644
--- a/libass/ass_bitmap.c
+++ b/libass/ass_bitmap.c
@@ -59,73 +59,41 @@
 #endif
 
 
-void ass_synth_blur(const BitmapEngine *engine, int opaque_box, int be,
-                    double blur_radius, Bitmap *bm_g, Bitmap *bm_o)
+void ass_synth_blur(const BitmapEngine *engine, Bitmap *bm,
+                    int be, double blur_radius)
 {
-    bool blur_g = !bm_o->buffer || opaque_box;
-    if (blur_g && !bm_g->buffer)
+    if (!bm->buffer)
         return;
 
     // Apply gaussian blur
     double r2 = blur_radius * blur_radius / log(256);
-    if (r2 > 0.001) {
-        if (bm_o->buffer)
-            ass_gaussian_blur(engine, bm_o, r2);
-        if (blur_g)
-            ass_gaussian_blur(engine, bm_g, r2);
-    }
+    if (r2 > 0.001)
+        ass_gaussian_blur(engine, bm, r2);
+
+    if (!be)
+        return;
 
     // Apply box blur (multiple passes, if requested)
-    if (be) {
-        size_t size_o = 0, size_g = 0;
-        if (bm_o->buffer)
-            size_o = sizeof(uint16_t) * bm_o->stride * 2;
-        if (blur_g)
-            size_g = sizeof(uint16_t) * bm_g->stride * 2;
-        size_t size = FFMAX(size_o, size_g);
-        uint16_t *tmp = size ? ass_aligned_alloc(32, size, false) : NULL;
-        if (!tmp)
-            return;
-        if (bm_o->buffer) {
-            int passes = be;
-            int32_t w = bm_o->w;
-            int32_t h = bm_o->h;
-            ptrdiff_t stride = bm_o->stride;
-            uint8_t *buf = bm_o->buffer;
-            if(w && h){
-                if(passes > 1){
-                    be_blur_pre(buf, w, h, stride);
-                    while(--passes){
-                        memset(tmp, 0, stride * 2);
-                        engine->be_blur(buf, w, h, stride, tmp);
-                    }
-                    be_blur_post(buf, w, h, stride);
-                }
-                memset(tmp, 0, stride * 2);
-                engine->be_blur(buf, w, h, stride, tmp);
-            }
-        }
-        if (blur_g) {
-            int passes = be;
-            int32_t w = bm_g->w;
-            int32_t h = bm_g->h;
-            ptrdiff_t stride = bm_g->stride;
-            uint8_t *buf = bm_g->buffer;
-            if(w && h){
-                if(passes > 1){
-                    be_blur_pre(buf, w, h, stride);
-                    while(--passes){
-                        memset(tmp, 0, stride * 2);
-                        engine->be_blur(buf, w, h, stride, tmp);
-                    }
-                    be_blur_post(buf, w, h, stride);
-                }
-                memset(tmp, 0, stride * 2);
-                engine->be_blur(buf, w, h, stride, tmp);
-            }
-        }
-        ass_aligned_free(tmp);
+    size_t size = sizeof(uint16_t) * bm->stride * 2;
+    uint16_t *tmp = ass_aligned_alloc(32, size, false);
+    if (!tmp)
+        return;
+
+    int32_t w = bm->w;
+    int32_t h = bm->h;
+    ptrdiff_t stride = bm->stride;
+    uint8_t *buf = bm->buffer;
+    if (--be) {
+        be_blur_pre(buf, w, h, stride);
+        do {
+            memset(tmp, 0, stride * 2);
+            engine->be_blur(buf, w, h, stride, tmp);
+        } while (--be);
+        be_blur_post(buf, w, h, stride);
     }
+    memset(tmp, 0, stride * 2);
+    engine->be_blur(buf, w, h, stride, tmp);
+    ass_aligned_free(tmp);
 }
 
 bool alloc_bitmap(const BitmapEngine *engine, Bitmap *bm,
diff --git a/libass/ass_bitmap.h b/libass/ass_bitmap.h
index e3efbf7..4c21629 100644
--- a/libass/ass_bitmap.h
+++ b/libass/ass_bitmap.h
@@ -104,8 +104,8 @@ void ass_free_bitmap(Bitmap *bm);
 bool outline_to_bitmap(ASS_Renderer *render_priv, Bitmap *bm,
                        ASS_Outline *outline1, ASS_Outline *outline2);
 
-void ass_synth_blur(const BitmapEngine *engine, int opaque_box, int be,
-                    double blur_radius, Bitmap *bm_g, Bitmap *bm_o);
+void ass_synth_blur(const BitmapEngine *engine, Bitmap *bm,
+                    int be, double blur_radius);
 
 int be_padding(int be);
 void be_blur_pre(uint8_t *buf, intptr_t w,
diff --git a/libass/ass_render.c b/libass/ass_render.c
index 468c184..304e7b2 100644
--- a/libass/ass_render.c
+++ b/libass/ass_render.c
@@ -2416,8 +2416,9 @@ size_t ass_composite_construct(void *key, void *value, void *priv)
     }
 
     if (v->bm.buffer || v->bm_o.buffer) {
-        ass_synth_blur(render_priv->engine, k->filter.flags & FILTER_BORDER_STYLE_3,
-                       k->filter.be, k->filter.blur, &v->bm, &v->bm_o);
+        if (!v->bm_o.buffer || (k->filter.flags & FILTER_BORDER_STYLE_3))
+            ass_synth_blur(render_priv->engine, &v->bm, k->filter.be, k->filter.blur);
+        ass_synth_blur(render_priv->engine, &v->bm_o, k->filter.be, k->filter.blur);
         if (k->filter.flags & FILTER_DRAW_SHADOW)
             make_shadow_bitmap(render_priv, v, &k->filter);
     }
-- 
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